Date:	Tue, 16 Mar 2010 14:09:01 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Alex Chiang <achiang@...com>
Cc:	greg@...ah.com, linux-usb@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] USB: xhci: rename driver to xhci_hcd

On Tue, Mar 16, 2010 at 02:48:45PM -0600, Alex Chiang wrote:
> Naming consistency with other USB HCDs.
> 
> Signed-off-by: Alex Chiang <achiang@...com>
> ---
> Refreshed against 2.6.34-rc1 and compile tested.
> 
> I didn't refresh the debug one; waiting to hear back from Sarah
> to see if it's worth doing or not.

Yes, it is worth doing.  Please send an updated patch. :)

Sarah Sharp

> ---
>  drivers/usb/host/Makefile   |    4 
>  drivers/usb/host/xhci-hcd.c | 1916 -------------------------------------------
>  drivers/usb/host/xhci.c     | 1916 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1918 insertions(+), 1918 deletions(-)
>  delete mode 100644 drivers/usb/host/xhci-hcd.c
>  create mode 100644 drivers/usb/host/xhci.c
> 
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index 4e0c67f..b6315aa 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -12,7 +12,7 @@ fhci-objs := fhci-hcd.o fhci-hub.o fhci-q.o fhci-mem.o \
>  ifeq ($(CONFIG_FHCI_DEBUG),y)
>  fhci-objs += fhci-dbg.o
>  endif
> -xhci-objs := xhci-hcd.o xhci-mem.o xhci-pci.o xhci-ring.o xhci-hub.o xhci-dbg.o
> +xhci-hcd-objs := xhci.o xhci-mem.o xhci-pci.o xhci-ring.o xhci-hub.o xhci-dbg.o
>  
>  obj-$(CONFIG_USB_WHCI_HCD)	+= whci/
>  
> @@ -25,7 +25,7 @@ obj-$(CONFIG_USB_ISP1362_HCD)	+= isp1362-hcd.o
>  obj-$(CONFIG_USB_OHCI_HCD)	+= ohci-hcd.o
>  obj-$(CONFIG_USB_UHCI_HCD)	+= uhci-hcd.o
>  obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
> -obj-$(CONFIG_USB_XHCI_HCD)	+= xhci.o
> +obj-$(CONFIG_USB_XHCI_HCD)	+= xhci-hcd.o
>  obj-$(CONFIG_USB_SL811_HCD)	+= sl811-hcd.o
>  obj-$(CONFIG_USB_SL811_CS)	+= sl811_cs.o
>  obj-$(CONFIG_USB_U132_HCD)	+= u132-hcd.o
> diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
> deleted file mode 100644
> index 4cb69e0..0000000
> --- a/drivers/usb/host/xhci-hcd.c
> +++ /dev/null
> @@ -1,1916 +0,0 @@
> -/*
> - * xHCI host controller driver
> - *
> - * Copyright (C) 2008 Intel Corp.
> - *
> - * Author: Sarah Sharp
> - * Some code borrowed from the Linux EHCI driver.
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - *
> - * This program is distributed in the hope that it will be useful, but
> - * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> - * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> - * for more details.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, write to the Free Software Foundation,
> - * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> - */
> -
> -#include <linux/irq.h>
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
> -
> -#include "xhci.h"
> -
> -#define DRIVER_AUTHOR "Sarah Sharp"
> -#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
> -
> -/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
> -static int link_quirk;
> -module_param(link_quirk, int, S_IRUGO | S_IWUSR);
> -MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
> -
> -/* TODO: copied from ehci-hcd.c - can this be refactored? */
> -/*
> - * handshake - spin reading hc until handshake completes or fails
> - * @ptr: address of hc register to be read
> - * @mask: bits to look at in result of read
> - * @done: value of those bits when handshake succeeds
> - * @usec: timeout in microseconds
> - *
> - * Returns negative errno, or zero on success
> - *
> - * Success happens when the "mask" bits have the specified value (hardware
> - * handshake done).  There are two failure modes:  "usec" have passed (major
> - * hardware flakeout), or the register reads as all-ones (hardware removed).
> - */
> -static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
> -		      u32 mask, u32 done, int usec)
> -{
> -	u32	result;
> -
> -	do {
> -		result = xhci_readl(xhci, ptr);
> -		if (result == ~(u32)0)		/* card removed */
> -			return -ENODEV;
> -		result &= mask;
> -		if (result == done)
> -			return 0;
> -		udelay(1);
> -		usec--;
> -	} while (usec > 0);
> -	return -ETIMEDOUT;
> -}
> -
> -/*
> - * Disable interrupts and begin the xHCI halting process.
> - */
> -void xhci_quiesce(struct xhci_hcd *xhci)
> -{
> -	u32 halted;
> -	u32 cmd;
> -	u32 mask;
> -
> -	mask = ~(XHCI_IRQS);
> -	halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
> -	if (!halted)
> -		mask &= ~CMD_RUN;
> -
> -	cmd = xhci_readl(xhci, &xhci->op_regs->command);
> -	cmd &= mask;
> -	xhci_writel(xhci, cmd, &xhci->op_regs->command);
> -}
> -
> -/*
> - * Force HC into halt state.
> - *
> - * Disable any IRQs and clear the run/stop bit.
> - * HC will complete any current and actively pipelined transactions, and
> - * should halt within 16 microframes of the run/stop bit being cleared.
> - * Read HC Halted bit in the status register to see when the HC is finished.
> - * XXX: shouldn't we set HC_STATE_HALT here somewhere?
> - */
> -int xhci_halt(struct xhci_hcd *xhci)
> -{
> -	xhci_dbg(xhci, "// Halt the HC\n");
> -	xhci_quiesce(xhci);
> -
> -	return handshake(xhci, &xhci->op_regs->status,
> -			STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
> -}
> -
> -/*
> - * Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
> - *
> - * This resets pipelines, timers, counters, state machines, etc.
> - * Transactions will be terminated immediately, and operational registers
> - * will be set to their defaults.
> - */
> -int xhci_reset(struct xhci_hcd *xhci)
> -{
> -	u32 command;
> -	u32 state;
> -
> -	state = xhci_readl(xhci, &xhci->op_regs->status);
> -	if ((state & STS_HALT) == 0) {
> -		xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
> -		return 0;
> -	}
> -
> -	xhci_dbg(xhci, "// Reset the HC\n");
> -	command = xhci_readl(xhci, &xhci->op_regs->command);
> -	command |= CMD_RESET;
> -	xhci_writel(xhci, command, &xhci->op_regs->command);
> -	/* XXX: Why does EHCI set this here?  Shouldn't other code do this? */
> -	xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> -
> -	return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
> -}
> -
> -
> -#if 0
> -/* Set up MSI-X table for entry 0 (may claim other entries later) */
> -static int xhci_setup_msix(struct xhci_hcd *xhci)
> -{
> -	int ret;
> -	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> -
> -	xhci->msix_count = 0;
> -	/* XXX: did I do this right?  ixgbe does kcalloc for more than one */
> -	xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
> -	if (!xhci->msix_entries) {
> -		xhci_err(xhci, "Failed to allocate MSI-X entries\n");
> -		return -ENOMEM;
> -	}
> -	xhci->msix_entries[0].entry = 0;
> -
> -	ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
> -	if (ret) {
> -		xhci_err(xhci, "Failed to enable MSI-X\n");
> -		goto free_entries;
> -	}
> -
> -	/*
> -	 * Pass the xhci pointer value as the request_irq "cookie".
> -	 * If more irqs are added, this will need to be unique for each one.
> -	 */
> -	ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
> -			"xHCI", xhci_to_hcd(xhci));
> -	if (ret) {
> -		xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
> -		goto disable_msix;
> -	}
> -	xhci_dbg(xhci, "Finished setting up MSI-X\n");
> -	return 0;
> -
> -disable_msix:
> -	pci_disable_msix(pdev);
> -free_entries:
> -	kfree(xhci->msix_entries);
> -	xhci->msix_entries = NULL;
> -	return ret;
> -}
> -
> -/* XXX: code duplication; can xhci_setup_msix call this? */
> -/* Free any IRQs and disable MSI-X */
> -static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> -{
> -	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> -	if (!xhci->msix_entries)
> -		return;
> -
> -	free_irq(xhci->msix_entries[0].vector, xhci);
> -	pci_disable_msix(pdev);
> -	kfree(xhci->msix_entries);
> -	xhci->msix_entries = NULL;
> -	xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
> -}
> -#endif
> -
> -/*
> - * Initialize memory for HCD and xHC (one-time init).
> - *
> - * Program the PAGESIZE register, initialize the device context array, create
> - * device contexts (?), set up a command ring segment (or two?), create event
> - * ring (one for now).
> - */
> -int xhci_init(struct usb_hcd *hcd)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	int retval = 0;
> -
> -	xhci_dbg(xhci, "xhci_init\n");
> -	spin_lock_init(&xhci->lock);
> -	if (link_quirk) {
> -		xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
> -		xhci->quirks |= XHCI_LINK_TRB_QUIRK;
> -	} else {
> -		xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
> -	}
> -	retval = xhci_mem_init(xhci, GFP_KERNEL);
> -	xhci_dbg(xhci, "Finished xhci_init\n");
> -
> -	return retval;
> -}
> -
> -/*
> - * Called in interrupt context when there might be work
> - * queued on the event ring
> - *
> - * xhci->lock must be held by caller.
> - */
> -static void xhci_work(struct xhci_hcd *xhci)
> -{
> -	u32 temp;
> -	u64 temp_64;
> -
> -	/*
> -	 * Clear the op reg interrupt status first,
> -	 * so we can receive interrupts from other MSI-X interrupters.
> -	 * Write 1 to clear the interrupt status.
> -	 */
> -	temp = xhci_readl(xhci, &xhci->op_regs->status);
> -	temp |= STS_EINT;
> -	xhci_writel(xhci, temp, &xhci->op_regs->status);
> -	/* FIXME when MSI-X is supported and there are multiple vectors */
> -	/* Clear the MSI-X event interrupt status */
> -
> -	/* Acknowledge the interrupt */
> -	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -	temp |= 0x3;
> -	xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
> -	/* Flush posted writes */
> -	xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -
> -	if (xhci->xhc_state & XHCI_STATE_DYING)
> -		xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
> -				"Shouldn't IRQs be disabled?\n");
> -	else
> -		/* FIXME this should be a delayed service routine
> -		 * that clears the EHB.
> -		 */
> -		xhci_handle_event(xhci);
> -
> -	/* Clear the event handler busy flag (RW1C); the event ring should be empty. */
> -	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> -	xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
> -	/* Flush posted writes -- FIXME is this necessary? */
> -	xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -}
> -
> -/*-------------------------------------------------------------------------*/
> -
> -/*
> - * xHCI spec says we can get an interrupt, and if the HC has an error condition,
> - * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
> - * indicators of an event TRB error, but we check the status *first* to be safe.
> - */
> -irqreturn_t xhci_irq(struct usb_hcd *hcd)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	u32 temp, temp2;
> -	union xhci_trb *trb;
> -
> -	spin_lock(&xhci->lock);
> -	trb = xhci->event_ring->dequeue;
> -	/* Check if the xHC generated the interrupt, or the irq is shared */
> -	temp = xhci_readl(xhci, &xhci->op_regs->status);
> -	temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -	if (temp == 0xffffffff && temp2 == 0xffffffff)
> -		goto hw_died;
> -
> -	if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
> -		spin_unlock(&xhci->lock);
> -		return IRQ_NONE;
> -	}
> -	xhci_dbg(xhci, "op reg status = %08x\n", temp);
> -	xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
> -	xhci_dbg(xhci, "Event ring dequeue ptr:\n");
> -	xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
> -			(unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
> -			lower_32_bits(trb->link.segment_ptr),
> -			upper_32_bits(trb->link.segment_ptr),
> -			(unsigned int) trb->link.intr_target,
> -			(unsigned int) trb->link.control);
> -
> -	if (temp & STS_FATAL) {
> -		xhci_warn(xhci, "WARNING: Host System Error\n");
> -		xhci_halt(xhci);
> -hw_died:
> -		xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> -		spin_unlock(&xhci->lock);
> -		return -ESHUTDOWN;
> -	}
> -
> -	xhci_work(xhci);
> -	spin_unlock(&xhci->lock);
> -
> -	return IRQ_HANDLED;
> -}
> -
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> -void xhci_event_ring_work(unsigned long arg)
> -{
> -	unsigned long flags;
> -	int temp;
> -	u64 temp_64;
> -	struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
> -	int i, j;
> -
> -	xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	temp = xhci_readl(xhci, &xhci->op_regs->status);
> -	xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
> -	if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> -		xhci_dbg(xhci, "HW died, polling stopped.\n");
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		return;
> -	}
> -
> -	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -	xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
> -	xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
> -	xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
> -	xhci->error_bitmask = 0;
> -	xhci_dbg(xhci, "Event ring:\n");
> -	xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
> -	xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> -	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> -	temp_64 &= ~ERST_PTR_MASK;
> -	xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> -	xhci_dbg(xhci, "Command ring:\n");
> -	xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
> -	xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> -	xhci_dbg_cmd_ptrs(xhci);
> -	for (i = 0; i < MAX_HC_SLOTS; ++i) {
> -		if (!xhci->devs[i])
> -			continue;
> -		for (j = 0; j < 31; ++j) {
> -			struct xhci_ring *ring = xhci->devs[i]->eps[j].ring;
> -			if (!ring)
> -				continue;
> -			xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
> -			xhci_debug_segment(xhci, ring->deq_seg);
> -		}
> -	}
> -
> -	if (xhci->noops_submitted != NUM_TEST_NOOPS)
> -		if (xhci_setup_one_noop(xhci))
> -			xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	if (!xhci->zombie)
> -		mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
> -	else
> -		xhci_dbg(xhci, "Quit polling the event ring.\n");
> -}
> -#endif
> -
> -/*
> - * Start the HC after it was halted.
> - *
> - * This function is called by the USB core when the HC driver is added.
> - * Its opposite is xhci_stop().
> - *
> - * xhci_init() must be called once before this function can be called.
> - * Reset the HC, enable device slot contexts, program DCBAAP, and
> - * set command ring pointer and event ring pointer.
> - *
> - * Setup MSI-X vectors and enable interrupts.
> - */
> -int xhci_run(struct usb_hcd *hcd)
> -{
> -	u32 temp;
> -	u64 temp_64;
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	void (*doorbell)(struct xhci_hcd *) = NULL;
> -
> -	hcd->uses_new_polling = 1;
> -	hcd->poll_rh = 0;
> -
> -	xhci_dbg(xhci, "xhci_run\n");
> -#if 0	/* FIXME: MSI not setup yet */
> -	/* Do this at the very last minute */
> -	ret = xhci_setup_msix(xhci);
> -	if (!ret)
> -		return ret;
> -
> -	return -ENOSYS;
> -#endif
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> -	init_timer(&xhci->event_ring_timer);
> -	xhci->event_ring_timer.data = (unsigned long) xhci;
> -	xhci->event_ring_timer.function = xhci_event_ring_work;
> -	/* Poll the event ring */
> -	xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
> -	xhci->zombie = 0;
> -	xhci_dbg(xhci, "Setting event ring polling timer\n");
> -	add_timer(&xhci->event_ring_timer);
> -#endif
> -
> -	xhci_dbg(xhci, "Command ring memory map follows:\n");
> -	xhci_debug_ring(xhci, xhci->cmd_ring);
> -	xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> -	xhci_dbg_cmd_ptrs(xhci);
> -
> -	xhci_dbg(xhci, "ERST memory map follows:\n");
> -	xhci_dbg_erst(xhci, &xhci->erst);
> -	xhci_dbg(xhci, "Event ring:\n");
> -	xhci_debug_ring(xhci, xhci->event_ring);
> -	xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> -	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> -	temp_64 &= ~ERST_PTR_MASK;
> -	xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> -
> -	xhci_dbg(xhci, "// Set the interrupt modulation register\n");
> -	temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
> -	temp &= ~ER_IRQ_INTERVAL_MASK;
> -	temp |= (u32) 160;
> -	xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
> -
> -	/* Set the HCD state before we enable the irqs */
> -	hcd->state = HC_STATE_RUNNING;
> -	temp = xhci_readl(xhci, &xhci->op_regs->command);
> -	temp |= (CMD_EIE);
> -	xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
> -			temp);
> -	xhci_writel(xhci, temp, &xhci->op_regs->command);
> -
> -	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -	xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
> -			xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
> -	xhci_writel(xhci, ER_IRQ_ENABLE(temp),
> -			&xhci->ir_set->irq_pending);
> -	xhci_print_ir_set(xhci, xhci->ir_set, 0);
> -
> -	if (NUM_TEST_NOOPS > 0)
> -		doorbell = xhci_setup_one_noop(xhci);
> -
> -	temp = xhci_readl(xhci, &xhci->op_regs->command);
> -	temp |= (CMD_RUN);
> -	xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
> -			temp);
> -	xhci_writel(xhci, temp, &xhci->op_regs->command);
> -	/* Flush PCI posted writes */
> -	temp = xhci_readl(xhci, &xhci->op_regs->command);
> -	xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
> -	if (doorbell)
> -		(*doorbell)(xhci);
> -
> -	xhci_dbg(xhci, "Finished xhci_run\n");
> -	return 0;
> -}
> -
> -/*
> - * Stop xHCI driver.
> - *
> - * This function is called by the USB core when the HC driver is removed.
> - * Its opposite is xhci_run().
> - *
> - * Disable device contexts, disable IRQs, and quiesce the HC.
> - * Reset the HC, finish any completed transactions, and cleanup memory.
> - */
> -void xhci_stop(struct usb_hcd *hcd)
> -{
> -	u32 temp;
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -
> -	spin_lock_irq(&xhci->lock);
> -	xhci_halt(xhci);
> -	xhci_reset(xhci);
> -	spin_unlock_irq(&xhci->lock);
> -
> -#if 0	/* No MSI yet */
> -	xhci_cleanup_msix(xhci);
> -#endif
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> -	/* Tell the event ring poll function not to reschedule */
> -	xhci->zombie = 1;
> -	del_timer_sync(&xhci->event_ring_timer);
> -#endif
> -
> -	xhci_dbg(xhci, "// Disabling event ring interrupts\n");
> -	temp = xhci_readl(xhci, &xhci->op_regs->status);
> -	xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
> -	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -	xhci_writel(xhci, ER_IRQ_DISABLE(temp),
> -			&xhci->ir_set->irq_pending);
> -	xhci_print_ir_set(xhci, xhci->ir_set, 0);
> -
> -	xhci_dbg(xhci, "cleaning up memory\n");
> -	xhci_mem_cleanup(xhci);
> -	xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
> -		    xhci_readl(xhci, &xhci->op_regs->status));
> -}
> -
> -/*
> - * Shutdown HC (not bus-specific)
> - *
> - * This is called when the machine is rebooting or halting.  We assume that the
> - * machine will be powered off, and the HC's internal state will be reset.
> - * Don't bother to free memory.
> - */
> -void xhci_shutdown(struct usb_hcd *hcd)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -
> -	spin_lock_irq(&xhci->lock);
> -	xhci_halt(xhci);
> -	spin_unlock_irq(&xhci->lock);
> -
> -#if 0
> -	xhci_cleanup_msix(xhci);
> -#endif
> -
> -	xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
> -		    xhci_readl(xhci, &xhci->op_regs->status));
> -}
> -
> -/*-------------------------------------------------------------------------*/
> -
> -/**
> - * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
> - * HCDs.  Find the index for an endpoint given its descriptor.  Use the return
> - * value to right shift 1 for the bitmask.
> - *
> - * Index  = (epnum * 2) + direction - 1,
> - * where direction = 0 for OUT, 1 for IN.
> - * For control endpoints, the IN index is used (OUT index is unused), so
> - * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
> - */
> -unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
> -{
> -	unsigned int index;
> -	if (usb_endpoint_xfer_control(desc))
> -		index = (unsigned int) (usb_endpoint_num(desc)*2);
> -	else
> -		index = (unsigned int) (usb_endpoint_num(desc)*2) +
> -			(usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
> -	return index;
> -}
> -
> -/* Find the flag for this endpoint (for use in the control context).  Use the
> - * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
> - * bit 1, etc.
> - */
> -unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
> -{
> -	return 1 << (xhci_get_endpoint_index(desc) + 1);
> -}
> -
> -/* Find the flag for this endpoint (for use in the control context).  Use the
> - * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
> - * bit 1, etc.
> - */
> -unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
> -{
> -	return 1 << (ep_index + 1);
> -}
> -
> -/* Compute the last valid endpoint context index.  Basically, this is the
> - * endpoint index plus one.  For slot contexts with more than valid endpoint,
> - * we find the most significant bit set in the added contexts flags.
> - * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
> - * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
> - */
> -unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
> -{
> -	return fls(added_ctxs) - 1;
> -}
> -
> -/* Returns 1 if the arguments are OK;
> - * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
> - */
> -int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
> -		struct usb_host_endpoint *ep, int check_ep, const char *func) {
> -	if (!hcd || (check_ep && !ep) || !udev) {
> -		printk(KERN_DEBUG "xHCI %s called with invalid args\n",
> -				func);
> -		return -EINVAL;
> -	}
> -	if (!udev->parent) {
> -		printk(KERN_DEBUG "xHCI %s called for root hub\n",
> -				func);
> -		return 0;
> -	}
> -	if (!udev->slot_id) {
> -		printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
> -				func);
> -		return -EINVAL;
> -	}
> -	return 1;
> -}
> -
> -static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> -		struct usb_device *udev, struct xhci_command *command,
> -		bool ctx_change, bool must_succeed);
> -
> -/*
> - * Full speed devices may have a max packet size greater than 8 bytes, but the
> - * USB core doesn't know that until it reads the first 8 bytes of the
> - * descriptor.  If the usb_device's max packet size changes after that point,
> - * we need to issue an evaluate context command and wait on it.
> - */
> -static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
> -		unsigned int ep_index, struct urb *urb)
> -{
> -	struct xhci_container_ctx *in_ctx;
> -	struct xhci_container_ctx *out_ctx;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	struct xhci_ep_ctx *ep_ctx;
> -	int max_packet_size;
> -	int hw_max_packet_size;
> -	int ret = 0;
> -
> -	out_ctx = xhci->devs[slot_id]->out_ctx;
> -	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> -	hw_max_packet_size = MAX_PACKET_DECODED(ep_ctx->ep_info2);
> -	max_packet_size = urb->dev->ep0.desc.wMaxPacketSize;
> -	if (hw_max_packet_size != max_packet_size) {
> -		xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
> -		xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
> -				max_packet_size);
> -		xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
> -				hw_max_packet_size);
> -		xhci_dbg(xhci, "Issuing evaluate context command.\n");
> -
> -		/* Set up the modified control endpoint 0 */
> -		xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> -				xhci->devs[slot_id]->out_ctx, ep_index);
> -		in_ctx = xhci->devs[slot_id]->in_ctx;
> -		ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> -		ep_ctx->ep_info2 &= ~MAX_PACKET_MASK;
> -		ep_ctx->ep_info2 |= MAX_PACKET(max_packet_size);
> -
> -		/* Set up the input context flags for the command */
> -		/* FIXME: This won't work if a non-default control endpoint
> -		 * changes max packet sizes.
> -		 */
> -		ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> -		ctrl_ctx->add_flags = EP0_FLAG;
> -		ctrl_ctx->drop_flags = 0;
> -
> -		xhci_dbg(xhci, "Slot %d input context\n", slot_id);
> -		xhci_dbg_ctx(xhci, in_ctx, ep_index);
> -		xhci_dbg(xhci, "Slot %d output context\n", slot_id);
> -		xhci_dbg_ctx(xhci, out_ctx, ep_index);
> -
> -		ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
> -				true, false);
> -
> -		/* Clean up the input context for later use by bandwidth
> -		 * functions.
> -		 */
> -		ctrl_ctx->add_flags = SLOT_FLAG;
> -	}
> -	return ret;
> -}
> -
> -/*
> - * non-error returns are a promise to giveback() the urb later
> - * we drop ownership so next owner (or urb unlink) can get it
> - */
> -int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	unsigned long flags;
> -	int ret = 0;
> -	unsigned int slot_id, ep_index;
> -
> -
> -	if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
> -		return -EINVAL;
> -
> -	slot_id = urb->dev->slot_id;
> -	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> -
> -	if (!xhci->devs || !xhci->devs[slot_id]) {
> -		if (!in_interrupt())
> -			dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
> -		ret = -EINVAL;
> -		goto exit;
> -	}
> -	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
> -		if (!in_interrupt())
> -			xhci_dbg(xhci, "urb submitted during PCI suspend\n");
> -		ret = -ESHUTDOWN;
> -		goto exit;
> -	}
> -	if (usb_endpoint_xfer_control(&urb->ep->desc)) {
> -		/* Check to see if the max packet size for the default control
> -		 * endpoint changed during FS device enumeration
> -		 */
> -		if (urb->dev->speed == USB_SPEED_FULL) {
> -			ret = xhci_check_maxpacket(xhci, slot_id,
> -					ep_index, urb);
> -			if (ret < 0)
> -				return ret;
> -		}
> -
> -		/* We have a spinlock and interrupts disabled, so we must pass
> -		 * atomic context to this function, which may allocate memory.
> -		 */
> -		spin_lock_irqsave(&xhci->lock, flags);
> -		if (xhci->xhc_state & XHCI_STATE_DYING)
> -			goto dying;
> -		ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
> -				slot_id, ep_index);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -	} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
> -		spin_lock_irqsave(&xhci->lock, flags);
> -		if (xhci->xhc_state & XHCI_STATE_DYING)
> -			goto dying;
> -		ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
> -				slot_id, ep_index);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -	} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
> -		spin_lock_irqsave(&xhci->lock, flags);
> -		if (xhci->xhc_state & XHCI_STATE_DYING)
> -			goto dying;
> -		ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
> -				slot_id, ep_index);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -	} else {
> -		ret = -EINVAL;
> -	}
> -exit:
> -	return ret;
> -dying:
> -	xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
> -			"non-responsive xHCI host.\n",
> -			urb->ep->desc.bEndpointAddress, urb);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -	return -ESHUTDOWN;
> -}
> -
> -/*
> - * Remove the URB's TD from the endpoint ring.  This may cause the HC to stop
> - * USB transfers, potentially stopping in the middle of a TRB buffer.  The HC
> - * should pick up where it left off in the TD, unless a Set Transfer Ring
> - * Dequeue Pointer is issued.
> - *
> - * The TRBs that make up the buffers for the canceled URB will be "removed" from
> - * the ring.  Since the ring is a contiguous structure, they can't be physically
> - * removed.  Instead, there are two options:
> - *
> - *  1) If the HC is in the middle of processing the URB to be canceled, we
> - *     simply move the ring's dequeue pointer past those TRBs using the Set
> - *     Transfer Ring Dequeue Pointer command.  This will be the common case,
> - *     when drivers timeout on the last submitted URB and attempt to cancel.
> - *
> - *  2) If the HC is in the middle of a different TD, we turn the TRBs into a
> - *     series of 1-TRB transfer no-op TDs.  (No-ops shouldn't be chained.)  The
> - *     HC will need to invalidate the any TRBs it has cached after the stop
> - *     endpoint command, as noted in the xHCI 0.95 errata.
> - *
> - *  3) The TD may have completed by the time the Stop Endpoint Command
> - *     completes, so software needs to handle that case too.
> - *
> - * This function should protect against the TD enqueueing code ringing the
> - * doorbell while this code is waiting for a Stop Endpoint command to complete.
> - * It also needs to account for multiple cancellations on happening at the same
> - * time for the same endpoint.
> - *
> - * Note that this function can be called in any context, or so says
> - * usb_hcd_unlink_urb()
> - */
> -int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
> -{
> -	unsigned long flags;
> -	int ret;
> -	u32 temp;
> -	struct xhci_hcd *xhci;
> -	struct xhci_td *td;
> -	unsigned int ep_index;
> -	struct xhci_ring *ep_ring;
> -	struct xhci_virt_ep *ep;
> -
> -	xhci = hcd_to_xhci(hcd);
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	/* Make sure the URB hasn't completed or been unlinked already */
> -	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
> -	if (ret || !urb->hcpriv)
> -		goto done;
> -	temp = xhci_readl(xhci, &xhci->op_regs->status);
> -	if (temp == 0xffffffff) {
> -		xhci_dbg(xhci, "HW died, freeing TD.\n");
> -		td = (struct xhci_td *) urb->hcpriv;
> -
> -		usb_hcd_unlink_urb_from_ep(hcd, urb);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, -ESHUTDOWN);
> -		kfree(td);
> -		return ret;
> -	}
> -	if (xhci->xhc_state & XHCI_STATE_DYING) {
> -		xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
> -				"non-responsive xHCI host.\n",
> -				urb->ep->desc.bEndpointAddress, urb);
> -		/* Let the stop endpoint command watchdog timer (which set this
> -		 * state) finish cleaning up the endpoint TD lists.  We must
> -		 * have caught it in the middle of dropping a lock and giving
> -		 * back an URB.
> -		 */
> -		goto done;
> -	}
> -
> -	xhci_dbg(xhci, "Cancel URB %p\n", urb);
> -	xhci_dbg(xhci, "Event ring:\n");
> -	xhci_debug_ring(xhci, xhci->event_ring);
> -	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> -	ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
> -	ep_ring = ep->ring;
> -	xhci_dbg(xhci, "Endpoint ring:\n");
> -	xhci_debug_ring(xhci, ep_ring);
> -	td = (struct xhci_td *) urb->hcpriv;
> -
> -	list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
> -	/* Queue a stop endpoint command, but only if this is
> -	 * the first cancellation to be handled.
> -	 */
> -	if (!(ep->ep_state & EP_HALT_PENDING)) {
> -		ep->ep_state |= EP_HALT_PENDING;
> -		ep->stop_cmds_pending++;
> -		ep->stop_cmd_timer.expires = jiffies +
> -			XHCI_STOP_EP_CMD_TIMEOUT * HZ;
> -		add_timer(&ep->stop_cmd_timer);
> -		xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
> -		xhci_ring_cmd_db(xhci);
> -	}
> -done:
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -	return ret;
> -}
> -
> -/* Drop an endpoint from a new bandwidth configuration for this device.
> - * Only one call to this function is allowed per endpoint before
> - * check_bandwidth() or reset_bandwidth() must be called.
> - * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> - * add the endpoint to the schedule with possibly new parameters denoted by a
> - * different endpoint descriptor in usb_host_endpoint.
> - * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> - * not allowed.
> - *
> - * The USB core will not allow URBs to be queued to an endpoint that is being
> - * disabled, so there's no need for mutual exclusion to protect
> - * the xhci->devs[slot_id] structure.
> - */
> -int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> -		struct usb_host_endpoint *ep)
> -{
> -	struct xhci_hcd *xhci;
> -	struct xhci_container_ctx *in_ctx, *out_ctx;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	struct xhci_slot_ctx *slot_ctx;
> -	unsigned int last_ctx;
> -	unsigned int ep_index;
> -	struct xhci_ep_ctx *ep_ctx;
> -	u32 drop_flag;
> -	u32 new_add_flags, new_drop_flags, new_slot_info;
> -	int ret;
> -
> -	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> -	if (ret <= 0)
> -		return ret;
> -	xhci = hcd_to_xhci(hcd);
> -	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> -
> -	drop_flag = xhci_get_endpoint_flag(&ep->desc);
> -	if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
> -		xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
> -				__func__, drop_flag);
> -		return 0;
> -	}
> -
> -	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> -		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> -				__func__);
> -		return -EINVAL;
> -	}
> -
> -	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> -	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> -	ep_index = xhci_get_endpoint_index(&ep->desc);
> -	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> -	/* If the HC already knows the endpoint is disabled,
> -	 * or the HCD has noted it is disabled, ignore this request
> -	 */
> -	if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
> -			ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
> -		xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
> -				__func__, ep);
> -		return 0;
> -	}
> -
> -	ctrl_ctx->drop_flags |= drop_flag;
> -	new_drop_flags = ctrl_ctx->drop_flags;
> -
> -	ctrl_ctx->add_flags &= ~drop_flag;
> -	new_add_flags = ctrl_ctx->add_flags;
> -
> -	last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
> -	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> -	/* Update the last valid endpoint context, if we deleted the last one */
> -	if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
> -		slot_ctx->dev_info &= ~LAST_CTX_MASK;
> -		slot_ctx->dev_info |= LAST_CTX(last_ctx);
> -	}
> -	new_slot_info = slot_ctx->dev_info;
> -
> -	xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
> -
> -	xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> -			(unsigned int) ep->desc.bEndpointAddress,
> -			udev->slot_id,
> -			(unsigned int) new_drop_flags,
> -			(unsigned int) new_add_flags,
> -			(unsigned int) new_slot_info);
> -	return 0;
> -}
> -
> -/* Add an endpoint to a new possible bandwidth configuration for this device.
> - * Only one call to this function is allowed per endpoint before
> - * check_bandwidth() or reset_bandwidth() must be called.
> - * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> - * add the endpoint to the schedule with possibly new parameters denoted by a
> - * different endpoint descriptor in usb_host_endpoint.
> - * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> - * not allowed.
> - *
> - * The USB core will not allow URBs to be queued to an endpoint until the
> - * configuration or alt setting is installed in the device, so there's no need
> - * for mutual exclusion to protect the xhci->devs[slot_id] structure.
> - */
> -int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> -		struct usb_host_endpoint *ep)
> -{
> -	struct xhci_hcd *xhci;
> -	struct xhci_container_ctx *in_ctx, *out_ctx;
> -	unsigned int ep_index;
> -	struct xhci_ep_ctx *ep_ctx;
> -	struct xhci_slot_ctx *slot_ctx;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	u32 added_ctxs;
> -	unsigned int last_ctx;
> -	u32 new_add_flags, new_drop_flags, new_slot_info;
> -	int ret = 0;
> -
> -	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> -	if (ret <= 0) {
> -		/* So we won't queue a reset ep command for a root hub */
> -		ep->hcpriv = NULL;
> -		return ret;
> -	}
> -	xhci = hcd_to_xhci(hcd);
> -
> -	added_ctxs = xhci_get_endpoint_flag(&ep->desc);
> -	last_ctx = xhci_last_valid_endpoint(added_ctxs);
> -	if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
> -		/* FIXME when we have to issue an evaluate endpoint command to
> -		 * deal with ep0 max packet size changing once we get the
> -		 * descriptors
> -		 */
> -		xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
> -				__func__, added_ctxs);
> -		return 0;
> -	}
> -
> -	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> -		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> -				__func__);
> -		return -EINVAL;
> -	}
> -
> -	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> -	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> -	ep_index = xhci_get_endpoint_index(&ep->desc);
> -	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> -	/* If the HCD has already noted the endpoint is enabled,
> -	 * ignore this request.
> -	 */
> -	if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
> -		xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
> -				__func__, ep);
> -		return 0;
> -	}
> -
> -	/*
> -	 * Configuration and alternate setting changes must be done in
> -	 * process context, not interrupt context (or so documenation
> -	 * for usb_set_interface() and usb_set_configuration() claim).
> -	 */
> -	if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
> -				udev, ep, GFP_NOIO) < 0) {
> -		dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
> -				__func__, ep->desc.bEndpointAddress);
> -		return -ENOMEM;
> -	}
> -
> -	ctrl_ctx->add_flags |= added_ctxs;
> -	new_add_flags = ctrl_ctx->add_flags;
> -
> -	/* If xhci_endpoint_disable() was called for this endpoint, but the
> -	 * xHC hasn't been notified yet through the check_bandwidth() call,
> -	 * this re-adds a new state for the endpoint from the new endpoint
> -	 * descriptors.  We must drop and re-add this endpoint, so we leave the
> -	 * drop flags alone.
> -	 */
> -	new_drop_flags = ctrl_ctx->drop_flags;
> -
> -	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> -	/* Update the last valid endpoint context, if we just added one past */
> -	if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
> -		slot_ctx->dev_info &= ~LAST_CTX_MASK;
> -		slot_ctx->dev_info |= LAST_CTX(last_ctx);
> -	}
> -	new_slot_info = slot_ctx->dev_info;
> -
> -	/* Store the usb_device pointer for later use */
> -	ep->hcpriv = udev;
> -
> -	xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> -			(unsigned int) ep->desc.bEndpointAddress,
> -			udev->slot_id,
> -			(unsigned int) new_drop_flags,
> -			(unsigned int) new_add_flags,
> -			(unsigned int) new_slot_info);
> -	return 0;
> -}
> -
> -static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
> -{
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	struct xhci_ep_ctx *ep_ctx;
> -	struct xhci_slot_ctx *slot_ctx;
> -	int i;
> -
> -	/* When a device's add flag and drop flag are zero, any subsequent
> -	 * configure endpoint command will leave that endpoint's state
> -	 * untouched.  Make sure we don't leave any old state in the input
> -	 * endpoint contexts.
> -	 */
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> -	ctrl_ctx->drop_flags = 0;
> -	ctrl_ctx->add_flags = 0;
> -	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> -	slot_ctx->dev_info &= ~LAST_CTX_MASK;
> -	/* Endpoint 0 is always valid */
> -	slot_ctx->dev_info |= LAST_CTX(1);
> -	for (i = 1; i < 31; ++i) {
> -		ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
> -		ep_ctx->ep_info = 0;
> -		ep_ctx->ep_info2 = 0;
> -		ep_ctx->deq = 0;
> -		ep_ctx->tx_info = 0;
> -	}
> -}
> -
> -static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
> -		struct usb_device *udev, int *cmd_status)
> -{
> -	int ret;
> -
> -	switch (*cmd_status) {
> -	case COMP_ENOMEM:
> -		dev_warn(&udev->dev, "Not enough host controller resources "
> -				"for new device state.\n");
> -		ret = -ENOMEM;
> -		/* FIXME: can we allocate more resources for the HC? */
> -		break;
> -	case COMP_BW_ERR:
> -		dev_warn(&udev->dev, "Not enough bandwidth "
> -				"for new device state.\n");
> -		ret = -ENOSPC;
> -		/* FIXME: can we go back to the old state? */
> -		break;
> -	case COMP_TRB_ERR:
> -		/* the HCD set up something wrong */
> -		dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
> -				"add flag = 1, "
> -				"and endpoint is not disabled.\n");
> -		ret = -EINVAL;
> -		break;
> -	case COMP_SUCCESS:
> -		dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
> -		ret = 0;
> -		break;
> -	default:
> -		xhci_err(xhci, "ERROR: unexpected command completion "
> -				"code 0x%x.\n", *cmd_status);
> -		ret = -EINVAL;
> -		break;
> -	}
> -	return ret;
> -}
> -
> -static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
> -		struct usb_device *udev, int *cmd_status)
> -{
> -	int ret;
> -	struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
> -
> -	switch (*cmd_status) {
> -	case COMP_EINVAL:
> -		dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
> -				"context command.\n");
> -		ret = -EINVAL;
> -		break;
> -	case COMP_EBADSLT:
> -		dev_warn(&udev->dev, "WARN: slot not enabled for"
> -				"evaluate context command.\n");
> -	case COMP_CTX_STATE:
> -		dev_warn(&udev->dev, "WARN: invalid context state for "
> -				"evaluate context command.\n");
> -		xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
> -		ret = -EINVAL;
> -		break;
> -	case COMP_SUCCESS:
> -		dev_dbg(&udev->dev, "Successful evaluate context command\n");
> -		ret = 0;
> -		break;
> -	default:
> -		xhci_err(xhci, "ERROR: unexpected command completion "
> -				"code 0x%x.\n", *cmd_status);
> -		ret = -EINVAL;
> -		break;
> -	}
> -	return ret;
> -}
> -
> -/* Issue a configure endpoint command or evaluate context command
> - * and wait for it to finish.
> - */
> -static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> -		struct usb_device *udev,
> -		struct xhci_command *command,
> -		bool ctx_change, bool must_succeed)
> -{
> -	int ret;
> -	int timeleft;
> -	unsigned long flags;
> -	struct xhci_container_ctx *in_ctx;
> -	struct completion *cmd_completion;
> -	int *cmd_status;
> -	struct xhci_virt_device *virt_dev;
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	virt_dev = xhci->devs[udev->slot_id];
> -	if (command) {
> -		in_ctx = command->in_ctx;
> -		cmd_completion = command->completion;
> -		cmd_status = &command->status;
> -		command->command_trb = xhci->cmd_ring->enqueue;
> -		list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
> -	} else {
> -		in_ctx = virt_dev->in_ctx;
> -		cmd_completion = &virt_dev->cmd_completion;
> -		cmd_status = &virt_dev->cmd_status;
> -	}
> -
> -	if (!ctx_change)
> -		ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
> -				udev->slot_id, must_succeed);
> -	else
> -		ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
> -				udev->slot_id);
> -	if (ret < 0) {
> -		if (command)
> -			list_del(&command->cmd_list);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
> -		return -ENOMEM;
> -	}
> -	xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	/* Wait for the configure endpoint command to complete */
> -	timeleft = wait_for_completion_interruptible_timeout(
> -			cmd_completion,
> -			USB_CTRL_SET_TIMEOUT);
> -	if (timeleft <= 0) {
> -		xhci_warn(xhci, "%s while waiting for %s command\n",
> -				timeleft == 0 ? "Timeout" : "Signal",
> -				ctx_change == 0 ?
> -					"configure endpoint" :
> -					"evaluate context");
> -		/* FIXME cancel the configure endpoint command */
> -		return -ETIME;
> -	}
> -
> -	if (!ctx_change)
> -		return xhci_configure_endpoint_result(xhci, udev, cmd_status);
> -	return xhci_evaluate_context_result(xhci, udev, cmd_status);
> -}
> -
> -/* Called after one or more calls to xhci_add_endpoint() or
> - * xhci_drop_endpoint().  If this call fails, the USB core is expected
> - * to call xhci_reset_bandwidth().
> - *
> - * Since we are in the middle of changing either configuration or
> - * installing a new alt setting, the USB core won't allow URBs to be
> - * enqueued for any endpoint on the old config or interface.  Nothing
> - * else should be touching the xhci->devs[slot_id] structure, so we
> - * don't need to take the xhci->lock for manipulating that.
> - */
> -int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	int i;
> -	int ret = 0;
> -	struct xhci_hcd *xhci;
> -	struct xhci_virt_device	*virt_dev;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	struct xhci_slot_ctx *slot_ctx;
> -
> -	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> -	if (ret <= 0)
> -		return ret;
> -	xhci = hcd_to_xhci(hcd);
> -
> -	if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
> -		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> -				__func__);
> -		return -EINVAL;
> -	}
> -	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> -	virt_dev = xhci->devs[udev->slot_id];
> -
> -	/* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> -	ctrl_ctx->add_flags |= SLOT_FLAG;
> -	ctrl_ctx->add_flags &= ~EP0_FLAG;
> -	ctrl_ctx->drop_flags &= ~SLOT_FLAG;
> -	ctrl_ctx->drop_flags &= ~EP0_FLAG;
> -	xhci_dbg(xhci, "New Input Control Context:\n");
> -	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> -	xhci_dbg_ctx(xhci, virt_dev->in_ctx,
> -			LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> -
> -	ret = xhci_configure_endpoint(xhci, udev, NULL,
> -			false, false);
> -	if (ret) {
> -		/* Callee should call reset_bandwidth() */
> -		return ret;
> -	}
> -
> -	xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
> -	xhci_dbg_ctx(xhci, virt_dev->out_ctx,
> -			LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> -
> -	xhci_zero_in_ctx(xhci, virt_dev);
> -	/* Install new rings and free or cache any old rings */
> -	for (i = 1; i < 31; ++i) {
> -		if (!virt_dev->eps[i].new_ring)
> -			continue;
> -		/* Only cache or free the old ring if it exists.
> -		 * It may not if this is the first add of an endpoint.
> -		 */
> -		if (virt_dev->eps[i].ring) {
> -			xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> -		}
> -		virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
> -		virt_dev->eps[i].new_ring = NULL;
> -	}
> -
> -	return ret;
> -}
> -
> -void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	struct xhci_hcd *xhci;
> -	struct xhci_virt_device	*virt_dev;
> -	int i, ret;
> -
> -	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> -	if (ret <= 0)
> -		return;
> -	xhci = hcd_to_xhci(hcd);
> -
> -	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> -		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> -				__func__);
> -		return;
> -	}
> -	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> -	virt_dev = xhci->devs[udev->slot_id];
> -	/* Free any rings allocated for added endpoints */
> -	for (i = 0; i < 31; ++i) {
> -		if (virt_dev->eps[i].new_ring) {
> -			xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
> -			virt_dev->eps[i].new_ring = NULL;
> -		}
> -	}
> -	xhci_zero_in_ctx(xhci, virt_dev);
> -}
> -
> -static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
> -		struct xhci_container_ctx *in_ctx,
> -		struct xhci_container_ctx *out_ctx,
> -		u32 add_flags, u32 drop_flags)
> -{
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> -	ctrl_ctx->add_flags = add_flags;
> -	ctrl_ctx->drop_flags = drop_flags;
> -	xhci_slot_copy(xhci, in_ctx, out_ctx);
> -	ctrl_ctx->add_flags |= SLOT_FLAG;
> -
> -	xhci_dbg(xhci, "Input Context:\n");
> -	xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
> -}
> -
> -void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
> -		unsigned int slot_id, unsigned int ep_index,
> -		struct xhci_dequeue_state *deq_state)
> -{
> -	struct xhci_container_ctx *in_ctx;
> -	struct xhci_ep_ctx *ep_ctx;
> -	u32 added_ctxs;
> -	dma_addr_t addr;
> -
> -	xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> -			xhci->devs[slot_id]->out_ctx, ep_index);
> -	in_ctx = xhci->devs[slot_id]->in_ctx;
> -	ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> -	addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
> -			deq_state->new_deq_ptr);
> -	if (addr == 0) {
> -		xhci_warn(xhci, "WARN Cannot submit config ep after "
> -				"reset ep command\n");
> -		xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
> -				deq_state->new_deq_seg,
> -				deq_state->new_deq_ptr);
> -		return;
> -	}
> -	ep_ctx->deq = addr | deq_state->new_cycle_state;
> -
> -	added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
> -	xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
> -			xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
> -}
> -
> -void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
> -		struct usb_device *udev, unsigned int ep_index)
> -{
> -	struct xhci_dequeue_state deq_state;
> -	struct xhci_virt_ep *ep;
> -
> -	xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
> -	ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> -	/* We need to move the HW's dequeue pointer past this TD,
> -	 * or it will attempt to resend it on the next doorbell ring.
> -	 */
> -	xhci_find_new_dequeue_state(xhci, udev->slot_id,
> -			ep_index, ep->stopped_td,
> -			&deq_state);
> -
> -	/* HW with the reset endpoint quirk will use the saved dequeue state to
> -	 * issue a configure endpoint command later.
> -	 */
> -	if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
> -		xhci_dbg(xhci, "Queueing new dequeue state\n");
> -		xhci_queue_new_dequeue_state(xhci, udev->slot_id,
> -				ep_index, &deq_state);
> -	} else {
> -		/* Better hope no one uses the input context between now and the
> -		 * reset endpoint completion!
> -		 */
> -		xhci_dbg(xhci, "Setting up input context for "
> -				"configure endpoint command\n");
> -		xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
> -				ep_index, &deq_state);
> -	}
> -}
> -
> -/* Deal with stalled endpoints.  The core should have sent the control message
> - * to clear the halt condition.  However, we need to make the xHCI hardware
> - * reset its sequence number, since a device will expect a sequence number of
> - * zero after the halt condition is cleared.
> - * Context: in_interrupt
> - */
> -void xhci_endpoint_reset(struct usb_hcd *hcd,
> -		struct usb_host_endpoint *ep)
> -{
> -	struct xhci_hcd *xhci;
> -	struct usb_device *udev;
> -	unsigned int ep_index;
> -	unsigned long flags;
> -	int ret;
> -	struct xhci_virt_ep *virt_ep;
> -
> -	xhci = hcd_to_xhci(hcd);
> -	udev = (struct usb_device *) ep->hcpriv;
> -	/* Called with a root hub endpoint (or an endpoint that wasn't added
> -	 * with xhci_add_endpoint()
> -	 */
> -	if (!ep->hcpriv)
> -		return;
> -	ep_index = xhci_get_endpoint_index(&ep->desc);
> -	virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> -	if (!virt_ep->stopped_td) {
> -		xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
> -				ep->desc.bEndpointAddress);
> -		return;
> -	}
> -	if (usb_endpoint_xfer_control(&ep->desc)) {
> -		xhci_dbg(xhci, "Control endpoint stall already handled.\n");
> -		return;
> -	}
> -
> -	xhci_dbg(xhci, "Queueing reset endpoint command\n");
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
> -	/*
> -	 * Can't change the ring dequeue pointer until it's transitioned to the
> -	 * stopped state, which is only upon a successful reset endpoint
> -	 * command.  Better hope that last command worked!
> -	 */
> -	if (!ret) {
> -		xhci_cleanup_stalled_ring(xhci, udev, ep_index);
> -		kfree(virt_ep->stopped_td);
> -		xhci_ring_cmd_db(xhci);
> -	}
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	if (ret)
> -		xhci_warn(xhci, "FIXME allocate a new ring segment\n");
> -}
> -
> -/*
> - * This submits a Reset Device Command, which will set the device state to 0,
> - * set the device address to 0, and disable all the endpoints except the default
> - * control endpoint.  The USB core should come back and call
> - * xhci_address_device(), and then re-set up the configuration.  If this is
> - * called because of a usb_reset_and_verify_device(), then the old alternate
> - * settings will be re-installed through the normal bandwidth allocation
> - * functions.
> - *
> - * Wait for the Reset Device command to finish.  Remove all structures
> - * associated with the endpoints that were disabled.  Clear the input device
> - * structure?  Cache the rings?  Reset the control endpoint 0 max packet size?
> - */
> -int xhci_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	int ret, i;
> -	unsigned long flags;
> -	struct xhci_hcd *xhci;
> -	unsigned int slot_id;
> -	struct xhci_virt_device *virt_dev;
> -	struct xhci_command *reset_device_cmd;
> -	int timeleft;
> -	int last_freed_endpoint;
> -
> -	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> -	if (ret <= 0)
> -		return ret;
> -	xhci = hcd_to_xhci(hcd);
> -	slot_id = udev->slot_id;
> -	virt_dev = xhci->devs[slot_id];
> -	if (!virt_dev) {
> -		xhci_dbg(xhci, "%s called with invalid slot ID %u\n",
> -				__func__, slot_id);
> -		return -EINVAL;
> -	}
> -
> -	xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
> -	/* Allocate the command structure that holds the struct completion.
> -	 * Assume we're in process context, since the normal device reset
> -	 * process has to wait for the device anyway.  Storage devices are
> -	 * reset as part of error handling, so use GFP_NOIO instead of
> -	 * GFP_KERNEL.
> -	 */
> -	reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
> -	if (!reset_device_cmd) {
> -		xhci_dbg(xhci, "Couldn't allocate command structure.\n");
> -		return -ENOMEM;
> -	}
> -
> -	/* Attempt to submit the Reset Device command to the command ring */
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
> -	list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
> -	ret = xhci_queue_reset_device(xhci, slot_id);
> -	if (ret) {
> -		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> -		list_del(&reset_device_cmd->cmd_list);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		goto command_cleanup;
> -	}
> -	xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	/* Wait for the Reset Device command to finish */
> -	timeleft = wait_for_completion_interruptible_timeout(
> -			reset_device_cmd->completion,
> -			USB_CTRL_SET_TIMEOUT);
> -	if (timeleft <= 0) {
> -		xhci_warn(xhci, "%s while waiting for reset device command\n",
> -				timeleft == 0 ? "Timeout" : "Signal");
> -		spin_lock_irqsave(&xhci->lock, flags);
> -		/* The timeout might have raced with the event ring handler, so
> -		 * only delete from the list if the item isn't poisoned.
> -		 */
> -		if (reset_device_cmd->cmd_list.next != LIST_POISON1)
> -			list_del(&reset_device_cmd->cmd_list);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		ret = -ETIME;
> -		goto command_cleanup;
> -	}
> -
> -	/* The Reset Device command can't fail, according to the 0.95/0.96 spec,
> -	 * unless we tried to reset a slot ID that wasn't enabled,
> -	 * or the device wasn't in the addressed or configured state.
> -	 */
> -	ret = reset_device_cmd->status;
> -	switch (ret) {
> -	case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
> -	case COMP_CTX_STATE: /* 0.96 completion code for same thing */
> -		xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
> -				slot_id,
> -				xhci_get_slot_state(xhci, virt_dev->out_ctx));
> -		xhci_info(xhci, "Not freeing device rings.\n");
> -		/* Don't treat this as an error.  May change my mind later. */
> -		ret = 0;
> -		goto command_cleanup;
> -	case COMP_SUCCESS:
> -		xhci_dbg(xhci, "Successful reset device command.\n");
> -		break;
> -	default:
> -		if (xhci_is_vendor_info_code(xhci, ret))
> -			break;
> -		xhci_warn(xhci, "Unknown completion code %u for "
> -				"reset device command.\n", ret);
> -		ret = -EINVAL;
> -		goto command_cleanup;
> -	}
> -
> -	/* Everything but endpoint 0 is disabled, so free or cache the rings. */
> -	last_freed_endpoint = 1;
> -	for (i = 1; i < 31; ++i) {
> -		if (!virt_dev->eps[i].ring)
> -			continue;
> -		xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> -		last_freed_endpoint = i;
> -	}
> -	xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
> -	xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
> -	ret = 0;
> -
> -command_cleanup:
> -	xhci_free_command(xhci, reset_device_cmd);
> -	return ret;
> -}
> -
> -/*
> - * At this point, the struct usb_device is about to go away, the device has
> - * disconnected, and all traffic has been stopped and the endpoints have been
> - * disabled.  Free any HC data structures associated with that device.
> - */
> -void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	struct xhci_virt_device *virt_dev;
> -	unsigned long flags;
> -	u32 state;
> -	int i;
> -
> -	if (udev->slot_id == 0)
> -		return;
> -	virt_dev = xhci->devs[udev->slot_id];
> -	if (!virt_dev)
> -		return;
> -
> -	/* Stop any wayward timer functions (which may grab the lock) */
> -	for (i = 0; i < 31; ++i) {
> -		virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
> -		del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
> -	}
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	/* Don't disable the slot if the host controller is dead. */
> -	state = xhci_readl(xhci, &xhci->op_regs->status);
> -	if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> -		xhci_free_virt_device(xhci, udev->slot_id);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		return;
> -	}
> -
> -	if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> -		return;
> -	}
> -	xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -	/*
> -	 * Event command completion handler will free any data structures
> -	 * associated with the slot.  XXX Can free sleep?
> -	 */
> -}
> -
> -/*
> - * Returns 0 if the xHC ran out of device slots, the Enable Slot command
> - * timed out, or allocating memory failed.  Returns 1 on success.
> - */
> -int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	unsigned long flags;
> -	int timeleft;
> -	int ret;
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
> -	if (ret) {
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> -		return 0;
> -	}
> -	xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	/* XXX: how much time for xHC slot assignment? */
> -	timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> -			USB_CTRL_SET_TIMEOUT);
> -	if (timeleft <= 0) {
> -		xhci_warn(xhci, "%s while waiting for a slot\n",
> -				timeleft == 0 ? "Timeout" : "Signal");
> -		/* FIXME cancel the enable slot request */
> -		return 0;
> -	}
> -
> -	if (!xhci->slot_id) {
> -		xhci_err(xhci, "Error while assigning device slot ID\n");
> -		return 0;
> -	}
> -	/* xhci_alloc_virt_device() does not touch rings; no need to lock */
> -	if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
> -		/* Disable slot, if we can do it without mem alloc */
> -		xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
> -		spin_lock_irqsave(&xhci->lock, flags);
> -		if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
> -			xhci_ring_cmd_db(xhci);
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		return 0;
> -	}
> -	udev->slot_id = xhci->slot_id;
> -	/* Is this a LS or FS device under a HS hub? */
> -	/* Hub or peripherial? */
> -	return 1;
> -}
> -
> -/*
> - * Issue an Address Device command (which will issue a SetAddress request to
> - * the device).
> - * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
> - * we should only issue and wait on one address command at the same time.
> - *
> - * We add one to the device address issued by the hardware because the USB core
> - * uses address 1 for the root hubs (even though they're not really devices).
> - */
> -int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> -	unsigned long flags;
> -	int timeleft;
> -	struct xhci_virt_device *virt_dev;
> -	int ret = 0;
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	struct xhci_slot_ctx *slot_ctx;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	u64 temp_64;
> -
> -	if (!udev->slot_id) {
> -		xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
> -		return -EINVAL;
> -	}
> -
> -	virt_dev = xhci->devs[udev->slot_id];
> -
> -	/* If this is a Set Address to an unconfigured device, setup ep 0 */
> -	if (!udev->config)
> -		xhci_setup_addressable_virt_dev(xhci, udev);
> -	/* Otherwise, assume the core has the device configured how it wants */
> -	xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> -	xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
> -					udev->slot_id);
> -	if (ret) {
> -		spin_unlock_irqrestore(&xhci->lock, flags);
> -		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> -		return ret;
> -	}
> -	xhci_ring_cmd_db(xhci);
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	/* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
> -	timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> -			USB_CTRL_SET_TIMEOUT);
> -	/* FIXME: From section 4.3.4: "Software shall be responsible for timing
> -	 * the SetAddress() "recovery interval" required by USB and aborting the
> -	 * command on a timeout.
> -	 */
> -	if (timeleft <= 0) {
> -		xhci_warn(xhci, "%s while waiting for a slot\n",
> -				timeleft == 0 ? "Timeout" : "Signal");
> -		/* FIXME cancel the address device command */
> -		return -ETIME;
> -	}
> -
> -	switch (virt_dev->cmd_status) {
> -	case COMP_CTX_STATE:
> -	case COMP_EBADSLT:
> -		xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
> -				udev->slot_id);
> -		ret = -EINVAL;
> -		break;
> -	case COMP_TX_ERR:
> -		dev_warn(&udev->dev, "Device not responding to set address.\n");
> -		ret = -EPROTO;
> -		break;
> -	case COMP_SUCCESS:
> -		xhci_dbg(xhci, "Successful Address Device command\n");
> -		break;
> -	default:
> -		xhci_err(xhci, "ERROR: unexpected command completion "
> -				"code 0x%x.\n", virt_dev->cmd_status);
> -		xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> -		xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> -		ret = -EINVAL;
> -		break;
> -	}
> -	if (ret) {
> -		return ret;
> -	}
> -	temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
> -	xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
> -	xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
> -			udev->slot_id,
> -			&xhci->dcbaa->dev_context_ptrs[udev->slot_id],
> -			(unsigned long long)
> -				xhci->dcbaa->dev_context_ptrs[udev->slot_id]);
> -	xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
> -			(unsigned long long)virt_dev->out_ctx->dma);
> -	xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> -	xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> -	xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> -	xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> -	/*
> -	 * USB core uses address 1 for the roothubs, so we add one to the
> -	 * address given back to us by the HC.
> -	 */
> -	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
> -	udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
> -	/* Zero the input context control for later use */
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> -	ctrl_ctx->add_flags = 0;
> -	ctrl_ctx->drop_flags = 0;
> -
> -	xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
> -	/* XXX Meh, not sure if anyone else but choose_address uses this. */
> -	set_bit(udev->devnum, udev->bus->devmap.devicemap);
> -
> -	return 0;
> -}
> -
> -/* Once a hub descriptor is fetched for a device, we need to update the xHC's
> - * internal data structures for the device.
> - */
> -int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
> -			struct usb_tt *tt, gfp_t mem_flags)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	struct xhci_virt_device *vdev;
> -	struct xhci_command *config_cmd;
> -	struct xhci_input_control_ctx *ctrl_ctx;
> -	struct xhci_slot_ctx *slot_ctx;
> -	unsigned long flags;
> -	unsigned think_time;
> -	int ret;
> -
> -	/* Ignore root hubs */
> -	if (!hdev->parent)
> -		return 0;
> -
> -	vdev = xhci->devs[hdev->slot_id];
> -	if (!vdev) {
> -		xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
> -		return -EINVAL;
> -	}
> -	config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
> -	if (!config_cmd) {
> -		xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
> -		return -ENOMEM;
> -	}
> -
> -	spin_lock_irqsave(&xhci->lock, flags);
> -	xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
> -	ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
> -	ctrl_ctx->add_flags |= SLOT_FLAG;
> -	slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
> -	slot_ctx->dev_info |= DEV_HUB;
> -	if (tt->multi)
> -		slot_ctx->dev_info |= DEV_MTT;
> -	if (xhci->hci_version > 0x95) {
> -		xhci_dbg(xhci, "xHCI version %x needs hub "
> -				"TT think time and number of ports\n",
> -				(unsigned int) xhci->hci_version);
> -		slot_ctx->dev_info2 |= XHCI_MAX_PORTS(hdev->maxchild);
> -		/* Set TT think time - convert from ns to FS bit times.
> -		 * 0 = 8 FS bit times, 1 = 16 FS bit times,
> -		 * 2 = 24 FS bit times, 3 = 32 FS bit times.
> -		 */
> -		think_time = tt->think_time;
> -		if (think_time != 0)
> -			think_time = (think_time / 666) - 1;
> -		slot_ctx->tt_info |= TT_THINK_TIME(think_time);
> -	} else {
> -		xhci_dbg(xhci, "xHCI version %x doesn't need hub "
> -				"TT think time or number of ports\n",
> -				(unsigned int) xhci->hci_version);
> -	}
> -	slot_ctx->dev_state = 0;
> -	spin_unlock_irqrestore(&xhci->lock, flags);
> -
> -	xhci_dbg(xhci, "Set up %s for hub device.\n",
> -			(xhci->hci_version > 0x95) ?
> -			"configure endpoint" : "evaluate context");
> -	xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
> -	xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
> -
> -	/* Issue and wait for the configure endpoint or
> -	 * evaluate context command.
> -	 */
> -	if (xhci->hci_version > 0x95)
> -		ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> -				false, false);
> -	else
> -		ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> -				true, false);
> -
> -	xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
> -	xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
> -
> -	xhci_free_command(xhci, config_cmd);
> -	return ret;
> -}
> -
> -int xhci_get_frame(struct usb_hcd *hcd)
> -{
> -	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -	/* EHCI mods by the periodic size.  Why? */
> -	return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
> -}
> -
> -MODULE_DESCRIPTION(DRIVER_DESC);
> -MODULE_AUTHOR(DRIVER_AUTHOR);
> -MODULE_LICENSE("GPL");
> -
> -static int __init xhci_hcd_init(void)
> -{
> -#ifdef CONFIG_PCI
> -	int retval = 0;
> -
> -	retval = xhci_register_pci();
> -
> -	if (retval < 0) {
> -		printk(KERN_DEBUG "Problem registering PCI driver.");
> -		return retval;
> -	}
> -#endif
> -	/*
> -	 * Check the compiler generated sizes of structures that must be laid
> -	 * out in specific ways for hardware access.
> -	 */
> -	BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
> -	/* xhci_device_control has eight fields, and also
> -	 * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
> -	 */
> -	BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
> -	BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
> -	/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
> -	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
> -	BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> -	return 0;
> -}
> -module_init(xhci_hcd_init);
> -
> -static void __exit xhci_hcd_cleanup(void)
> -{
> -#ifdef CONFIG_PCI
> -	xhci_unregister_pci();
> -#endif
> -}
> -module_exit(xhci_hcd_cleanup);
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> new file mode 100644
> index 0000000..4cb69e0
> --- /dev/null
> +++ b/drivers/usb/host/xhci.c
> @@ -0,0 +1,1916 @@
> +/*
> + * xHCI host controller driver
> + *
> + * Copyright (C) 2008 Intel Corp.
> + *
> + * Author: Sarah Sharp
> + * Some code borrowed from the Linux EHCI driver.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> + * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> + * for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software Foundation,
> + * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +
> +#include "xhci.h"
> +
> +#define DRIVER_AUTHOR "Sarah Sharp"
> +#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
> +
> +/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
> +static int link_quirk;
> +module_param(link_quirk, int, S_IRUGO | S_IWUSR);
> +MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
> +
> +/* TODO: copied from ehci-hcd.c - can this be refactored? */
> +/*
> + * handshake - spin reading hc until handshake completes or fails
> + * @ptr: address of hc register to be read
> + * @mask: bits to look at in result of read
> + * @done: value of those bits when handshake succeeds
> + * @usec: timeout in microseconds
> + *
> + * Returns negative errno, or zero on success
> + *
> + * Success happens when the "mask" bits have the specified value (hardware
> + * handshake done).  There are two failure modes:  "usec" have passed (major
> + * hardware flakeout), or the register reads as all-ones (hardware removed).
> + */
> +static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
> +		      u32 mask, u32 done, int usec)
> +{
> +	u32	result;
> +
> +	do {
> +		result = xhci_readl(xhci, ptr);
> +		if (result == ~(u32)0)		/* card removed */
> +			return -ENODEV;
> +		result &= mask;
> +		if (result == done)
> +			return 0;
> +		udelay(1);
> +		usec--;
> +	} while (usec > 0);
> +	return -ETIMEDOUT;
> +}
> +
> +/*
> + * Disable interrupts and begin the xHCI halting process.
> + */
> +void xhci_quiesce(struct xhci_hcd *xhci)
> +{
> +	u32 halted;
> +	u32 cmd;
> +	u32 mask;
> +
> +	mask = ~(XHCI_IRQS);
> +	halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
> +	if (!halted)
> +		mask &= ~CMD_RUN;
> +
> +	cmd = xhci_readl(xhci, &xhci->op_regs->command);
> +	cmd &= mask;
> +	xhci_writel(xhci, cmd, &xhci->op_regs->command);
> +}
> +
> +/*
> + * Force HC into halt state.
> + *
> + * Disable any IRQs and clear the run/stop bit.
> + * HC will complete any current and actively pipelined transactions, and
> + * should halt within 16 microframes of the run/stop bit being cleared.
> + * Read HC Halted bit in the status register to see when the HC is finished.
> + * XXX: shouldn't we set HC_STATE_HALT here somewhere?
> + */
> +int xhci_halt(struct xhci_hcd *xhci)
> +{
> +	xhci_dbg(xhci, "// Halt the HC\n");
> +	xhci_quiesce(xhci);
> +
> +	return handshake(xhci, &xhci->op_regs->status,
> +			STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
> +}
> +
> +/*
> + * Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
> + *
> + * This resets pipelines, timers, counters, state machines, etc.
> + * Transactions will be terminated immediately, and operational registers
> + * will be set to their defaults.
> + */
> +int xhci_reset(struct xhci_hcd *xhci)
> +{
> +	u32 command;
> +	u32 state;
> +
> +	state = xhci_readl(xhci, &xhci->op_regs->status);
> +	if ((state & STS_HALT) == 0) {
> +		xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
> +		return 0;
> +	}
> +
> +	xhci_dbg(xhci, "// Reset the HC\n");
> +	command = xhci_readl(xhci, &xhci->op_regs->command);
> +	command |= CMD_RESET;
> +	xhci_writel(xhci, command, &xhci->op_regs->command);
> +	/* XXX: Why does EHCI set this here?  Shouldn't other code do this? */
> +	xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> +
> +	return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
> +}
> +
> +
> +#if 0
> +/* Set up MSI-X table for entry 0 (may claim other entries later) */
> +static int xhci_setup_msix(struct xhci_hcd *xhci)
> +{
> +	int ret;
> +	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> +
> +	xhci->msix_count = 0;
> +	/* XXX: did I do this right?  ixgbe does kcalloc for more than one */
> +	xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
> +	if (!xhci->msix_entries) {
> +		xhci_err(xhci, "Failed to allocate MSI-X entries\n");
> +		return -ENOMEM;
> +	}
> +	xhci->msix_entries[0].entry = 0;
> +
> +	ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
> +	if (ret) {
> +		xhci_err(xhci, "Failed to enable MSI-X\n");
> +		goto free_entries;
> +	}
> +
> +	/*
> +	 * Pass the xhci pointer value as the request_irq "cookie".
> +	 * If more irqs are added, this will need to be unique for each one.
> +	 */
> +	ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
> +			"xHCI", xhci_to_hcd(xhci));
> +	if (ret) {
> +		xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
> +		goto disable_msix;
> +	}
> +	xhci_dbg(xhci, "Finished setting up MSI-X\n");
> +	return 0;
> +
> +disable_msix:
> +	pci_disable_msix(pdev);
> +free_entries:
> +	kfree(xhci->msix_entries);
> +	xhci->msix_entries = NULL;
> +	return ret;
> +}
> +
> +/* XXX: code duplication; can xhci_setup_msix call this? */
> +/* Free any IRQs and disable MSI-X */
> +static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> +{
> +	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> +	if (!xhci->msix_entries)
> +		return;
> +
> +	free_irq(xhci->msix_entries[0].vector, xhci);
> +	pci_disable_msix(pdev);
> +	kfree(xhci->msix_entries);
> +	xhci->msix_entries = NULL;
> +	xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
> +}
> +#endif
> +
> +/*
> + * Initialize memory for HCD and xHC (one-time init).
> + *
> + * Program the PAGESIZE register, initialize the device context array, create
> + * device contexts (?), set up a command ring segment (or two?), create event
> + * ring (one for now).
> + */
> +int xhci_init(struct usb_hcd *hcd)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	int retval = 0;
> +
> +	xhci_dbg(xhci, "xhci_init\n");
> +	spin_lock_init(&xhci->lock);
> +	if (link_quirk) {
> +		xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
> +		xhci->quirks |= XHCI_LINK_TRB_QUIRK;
> +	} else {
> +		xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
> +	}
> +	retval = xhci_mem_init(xhci, GFP_KERNEL);
> +	xhci_dbg(xhci, "Finished xhci_init\n");
> +
> +	return retval;
> +}
> +
> +/*
> + * Called in interrupt context when there might be work
> + * queued on the event ring
> + *
> + * xhci->lock must be held by caller.
> + */
> +static void xhci_work(struct xhci_hcd *xhci)
> +{
> +	u32 temp;
> +	u64 temp_64;
> +
> +	/*
> +	 * Clear the op reg interrupt status first,
> +	 * so we can receive interrupts from other MSI-X interrupters.
> +	 * Write 1 to clear the interrupt status.
> +	 */
> +	temp = xhci_readl(xhci, &xhci->op_regs->status);
> +	temp |= STS_EINT;
> +	xhci_writel(xhci, temp, &xhci->op_regs->status);
> +	/* FIXME when MSI-X is supported and there are multiple vectors */
> +	/* Clear the MSI-X event interrupt status */
> +
> +	/* Acknowledge the interrupt */
> +	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +	temp |= 0x3;
> +	xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
> +	/* Flush posted writes */
> +	xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +
> +	if (xhci->xhc_state & XHCI_STATE_DYING)
> +		xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
> +				"Shouldn't IRQs be disabled?\n");
> +	else
> +		/* FIXME this should be a delayed service routine
> +		 * that clears the EHB.
> +		 */
> +		xhci_handle_event(xhci);
> +
> +	/* Clear the event handler busy flag (RW1C); the event ring should be empty. */
> +	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> +	xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
> +	/* Flush posted writes -- FIXME is this necessary? */
> +	xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +}
> +
> +/*-------------------------------------------------------------------------*/
> +
> +/*
> + * xHCI spec says we can get an interrupt, and if the HC has an error condition,
> + * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
> + * indicators of an event TRB error, but we check the status *first* to be safe.
> + */
> +irqreturn_t xhci_irq(struct usb_hcd *hcd)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	u32 temp, temp2;
> +	union xhci_trb *trb;
> +
> +	spin_lock(&xhci->lock);
> +	trb = xhci->event_ring->dequeue;
> +	/* Check if the xHC generated the interrupt, or the irq is shared */
> +	temp = xhci_readl(xhci, &xhci->op_regs->status);
> +	temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +	if (temp == 0xffffffff && temp2 == 0xffffffff)
> +		goto hw_died;
> +
> +	if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
> +		spin_unlock(&xhci->lock);
> +		return IRQ_NONE;
> +	}
> +	xhci_dbg(xhci, "op reg status = %08x\n", temp);
> +	xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
> +	xhci_dbg(xhci, "Event ring dequeue ptr:\n");
> +	xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
> +			(unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
> +			lower_32_bits(trb->link.segment_ptr),
> +			upper_32_bits(trb->link.segment_ptr),
> +			(unsigned int) trb->link.intr_target,
> +			(unsigned int) trb->link.control);
> +
> +	if (temp & STS_FATAL) {
> +		xhci_warn(xhci, "WARNING: Host System Error\n");
> +		xhci_halt(xhci);
> +hw_died:
> +		xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> +		spin_unlock(&xhci->lock);
> +		return -ESHUTDOWN;
> +	}
> +
> +	xhci_work(xhci);
> +	spin_unlock(&xhci->lock);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> +void xhci_event_ring_work(unsigned long arg)
> +{
> +	unsigned long flags;
> +	int temp;
> +	u64 temp_64;
> +	struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
> +	int i, j;
> +
> +	xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	temp = xhci_readl(xhci, &xhci->op_regs->status);
> +	xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
> +	if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> +		xhci_dbg(xhci, "HW died, polling stopped.\n");
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		return;
> +	}
> +
> +	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +	xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
> +	xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
> +	xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
> +	xhci->error_bitmask = 0;
> +	xhci_dbg(xhci, "Event ring:\n");
> +	xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
> +	xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> +	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> +	temp_64 &= ~ERST_PTR_MASK;
> +	xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> +	xhci_dbg(xhci, "Command ring:\n");
> +	xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
> +	xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> +	xhci_dbg_cmd_ptrs(xhci);
> +	for (i = 0; i < MAX_HC_SLOTS; ++i) {
> +		if (!xhci->devs[i])
> +			continue;
> +		for (j = 0; j < 31; ++j) {
> +			struct xhci_ring *ring = xhci->devs[i]->eps[j].ring;
> +			if (!ring)
> +				continue;
> +			xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
> +			xhci_debug_segment(xhci, ring->deq_seg);
> +		}
> +	}
> +
> +	if (xhci->noops_submitted != NUM_TEST_NOOPS)
> +		if (xhci_setup_one_noop(xhci))
> +			xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	if (!xhci->zombie)
> +		mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
> +	else
> +		xhci_dbg(xhci, "Quit polling the event ring.\n");
> +}
> +#endif
> +
> +/*
> + * Start the HC after it was halted.
> + *
> + * This function is called by the USB core when the HC driver is added.
> + * Its opposite is xhci_stop().
> + *
> + * xhci_init() must be called once before this function can be called.
> + * Reset the HC, enable device slot contexts, program DCBAAP, and
> + * set command ring pointer and event ring pointer.
> + *
> + * Setup MSI-X vectors and enable interrupts.
> + */
> +int xhci_run(struct usb_hcd *hcd)
> +{
> +	u32 temp;
> +	u64 temp_64;
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	void (*doorbell)(struct xhci_hcd *) = NULL;
> +
> +	hcd->uses_new_polling = 1;
> +	hcd->poll_rh = 0;
> +
> +	xhci_dbg(xhci, "xhci_run\n");
> +#if 0	/* FIXME: MSI not setup yet */
> +	/* Do this at the very last minute */
> +	ret = xhci_setup_msix(xhci);
> +	if (!ret)
> +		return ret;
> +
> +	return -ENOSYS;
> +#endif
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> +	init_timer(&xhci->event_ring_timer);
> +	xhci->event_ring_timer.data = (unsigned long) xhci;
> +	xhci->event_ring_timer.function = xhci_event_ring_work;
> +	/* Poll the event ring */
> +	xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
> +	xhci->zombie = 0;
> +	xhci_dbg(xhci, "Setting event ring polling timer\n");
> +	add_timer(&xhci->event_ring_timer);
> +#endif
> +
> +	xhci_dbg(xhci, "Command ring memory map follows:\n");
> +	xhci_debug_ring(xhci, xhci->cmd_ring);
> +	xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> +	xhci_dbg_cmd_ptrs(xhci);
> +
> +	xhci_dbg(xhci, "ERST memory map follows:\n");
> +	xhci_dbg_erst(xhci, &xhci->erst);
> +	xhci_dbg(xhci, "Event ring:\n");
> +	xhci_debug_ring(xhci, xhci->event_ring);
> +	xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> +	temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> +	temp_64 &= ~ERST_PTR_MASK;
> +	xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> +
> +	xhci_dbg(xhci, "// Set the interrupt modulation register\n");
> +	temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
> +	temp &= ~ER_IRQ_INTERVAL_MASK;
> +	temp |= (u32) 160;
> +	xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
> +
> +	/* Set the HCD state before we enable the irqs */
> +	hcd->state = HC_STATE_RUNNING;
> +	temp = xhci_readl(xhci, &xhci->op_regs->command);
> +	temp |= (CMD_EIE);
> +	xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
> +			temp);
> +	xhci_writel(xhci, temp, &xhci->op_regs->command);
> +
> +	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +	xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
> +			xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
> +	xhci_writel(xhci, ER_IRQ_ENABLE(temp),
> +			&xhci->ir_set->irq_pending);
> +	xhci_print_ir_set(xhci, xhci->ir_set, 0);
> +
> +	if (NUM_TEST_NOOPS > 0)
> +		doorbell = xhci_setup_one_noop(xhci);
> +
> +	temp = xhci_readl(xhci, &xhci->op_regs->command);
> +	temp |= (CMD_RUN);
> +	xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
> +			temp);
> +	xhci_writel(xhci, temp, &xhci->op_regs->command);
> +	/* Flush PCI posted writes */
> +	temp = xhci_readl(xhci, &xhci->op_regs->command);
> +	xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
> +	if (doorbell)
> +		(*doorbell)(xhci);
> +
> +	xhci_dbg(xhci, "Finished xhci_run\n");
> +	return 0;
> +}
> +
> +/*
> + * Stop xHCI driver.
> + *
> + * This function is called by the USB core when the HC driver is removed.
> + * Its opposite is xhci_run().
> + *
> + * Disable device contexts, disable IRQs, and quiesce the HC.
> + * Reset the HC, finish any completed transactions, and cleanup memory.
> + */
> +void xhci_stop(struct usb_hcd *hcd)
> +{
> +	u32 temp;
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> +	spin_lock_irq(&xhci->lock);
> +	xhci_halt(xhci);
> +	xhci_reset(xhci);
> +	spin_unlock_irq(&xhci->lock);
> +
> +#if 0	/* No MSI yet */
> +	xhci_cleanup_msix(xhci);
> +#endif
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> +	/* Tell the event ring poll function not to reschedule */
> +	xhci->zombie = 1;
> +	del_timer_sync(&xhci->event_ring_timer);
> +#endif
> +
> +	xhci_dbg(xhci, "// Disabling event ring interrupts\n");
> +	temp = xhci_readl(xhci, &xhci->op_regs->status);
> +	xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
> +	temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +	xhci_writel(xhci, ER_IRQ_DISABLE(temp),
> +			&xhci->ir_set->irq_pending);
> +	xhci_print_ir_set(xhci, xhci->ir_set, 0);
> +
> +	xhci_dbg(xhci, "cleaning up memory\n");
> +	xhci_mem_cleanup(xhci);
> +	xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
> +		    xhci_readl(xhci, &xhci->op_regs->status));
> +}
> +
> +/*
> + * Shutdown HC (not bus-specific)
> + *
> + * This is called when the machine is rebooting or halting.  We assume that the
> + * machine will be powered off, and the HC's internal state will be reset.
> + * Don't bother to free memory.
> + */
> +void xhci_shutdown(struct usb_hcd *hcd)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> +	spin_lock_irq(&xhci->lock);
> +	xhci_halt(xhci);
> +	spin_unlock_irq(&xhci->lock);
> +
> +#if 0
> +	xhci_cleanup_msix(xhci);
> +#endif
> +
> +	xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
> +		    xhci_readl(xhci, &xhci->op_regs->status));
> +}
> +
> +/*-------------------------------------------------------------------------*/
> +
> +/**
> + * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
> + * HCDs.  Find the index for an endpoint given its descriptor.  Use the return
> + * value to right shift 1 for the bitmask.
> + *
> + * Index  = (epnum * 2) + direction - 1,
> + * where direction = 0 for OUT, 1 for IN.
> + * For control endpoints, the IN index is used (OUT index is unused), so
> + * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
> + */
> +unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
> +{
> +	unsigned int index;
> +	if (usb_endpoint_xfer_control(desc))
> +		index = (unsigned int) (usb_endpoint_num(desc)*2);
> +	else
> +		index = (unsigned int) (usb_endpoint_num(desc)*2) +
> +			(usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
> +	return index;
> +}
> +
> +/* Find the flag for this endpoint (for use in the control context).  Use the
> + * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
> + * bit 1, etc.
> + */
> +unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
> +{
> +	return 1 << (xhci_get_endpoint_index(desc) + 1);
> +}
> +
> +/* Find the flag for this endpoint (for use in the control context).  Use the
> + * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
> + * bit 1, etc.
> + */
> +unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
> +{
> +	return 1 << (ep_index + 1);
> +}
> +
> +/* Compute the last valid endpoint context index.  Basically, this is the
> + * endpoint index plus one.  For slot contexts with more than valid endpoint,
> + * we find the most significant bit set in the added contexts flags.
> + * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
> + * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
> + */
> +unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
> +{
> +	return fls(added_ctxs) - 1;
> +}
> +
> +/* Returns 1 if the arguments are OK;
> + * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
> + */
> +int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
> +		struct usb_host_endpoint *ep, int check_ep, const char *func) {
> +	if (!hcd || (check_ep && !ep) || !udev) {
> +		printk(KERN_DEBUG "xHCI %s called with invalid args\n",
> +				func);
> +		return -EINVAL;
> +	}
> +	if (!udev->parent) {
> +		printk(KERN_DEBUG "xHCI %s called for root hub\n",
> +				func);
> +		return 0;
> +	}
> +	if (!udev->slot_id) {
> +		printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
> +				func);
> +		return -EINVAL;
> +	}
> +	return 1;
> +}
> +
> +static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> +		struct usb_device *udev, struct xhci_command *command,
> +		bool ctx_change, bool must_succeed);
> +
> +/*
> + * Full speed devices may have a max packet size greater than 8 bytes, but the
> + * USB core doesn't know that until it reads the first 8 bytes of the
> + * descriptor.  If the usb_device's max packet size changes after that point,
> + * we need to issue an evaluate context command and wait on it.
> + */
> +static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
> +		unsigned int ep_index, struct urb *urb)
> +{
> +	struct xhci_container_ctx *in_ctx;
> +	struct xhci_container_ctx *out_ctx;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	struct xhci_ep_ctx *ep_ctx;
> +	int max_packet_size;
> +	int hw_max_packet_size;
> +	int ret = 0;
> +
> +	out_ctx = xhci->devs[slot_id]->out_ctx;
> +	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> +	hw_max_packet_size = MAX_PACKET_DECODED(ep_ctx->ep_info2);
> +	max_packet_size = urb->dev->ep0.desc.wMaxPacketSize;
> +	if (hw_max_packet_size != max_packet_size) {
> +		xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
> +		xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
> +				max_packet_size);
> +		xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
> +				hw_max_packet_size);
> +		xhci_dbg(xhci, "Issuing evaluate context command.\n");
> +
> +		/* Set up the modified control endpoint 0 */
> +		xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> +				xhci->devs[slot_id]->out_ctx, ep_index);
> +		in_ctx = xhci->devs[slot_id]->in_ctx;
> +		ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> +		ep_ctx->ep_info2 &= ~MAX_PACKET_MASK;
> +		ep_ctx->ep_info2 |= MAX_PACKET(max_packet_size);
> +
> +		/* Set up the input context flags for the command */
> +		/* FIXME: This won't work if a non-default control endpoint
> +		 * changes max packet sizes.
> +		 */
> +		ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> +		ctrl_ctx->add_flags = EP0_FLAG;
> +		ctrl_ctx->drop_flags = 0;
> +
> +		xhci_dbg(xhci, "Slot %d input context\n", slot_id);
> +		xhci_dbg_ctx(xhci, in_ctx, ep_index);
> +		xhci_dbg(xhci, "Slot %d output context\n", slot_id);
> +		xhci_dbg_ctx(xhci, out_ctx, ep_index);
> +
> +		ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
> +				true, false);
> +
> +		/* Clean up the input context for later use by bandwidth
> +		 * functions.
> +		 */
> +		ctrl_ctx->add_flags = SLOT_FLAG;
> +	}
> +	return ret;
> +}
> +
> +/*
> + * non-error returns are a promise to giveback() the urb later
> + * we drop ownership so next owner (or urb unlink) can get it
> + */
> +int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	unsigned long flags;
> +	int ret = 0;
> +	unsigned int slot_id, ep_index;
> +
> +
> +	if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
> +		return -EINVAL;
> +
> +	slot_id = urb->dev->slot_id;
> +	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> +
> +	if (!xhci->devs || !xhci->devs[slot_id]) {
> +		if (!in_interrupt())
> +			dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
> +		ret = -EINVAL;
> +		goto exit;
> +	}
> +	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
> +		if (!in_interrupt())
> +			xhci_dbg(xhci, "urb submitted during PCI suspend\n");
> +		ret = -ESHUTDOWN;
> +		goto exit;
> +	}
> +	if (usb_endpoint_xfer_control(&urb->ep->desc)) {
> +		/* Check to see if the max packet size for the default control
> +		 * endpoint changed during FS device enumeration
> +		 */
> +		if (urb->dev->speed == USB_SPEED_FULL) {
> +			ret = xhci_check_maxpacket(xhci, slot_id,
> +					ep_index, urb);
> +			if (ret < 0)
> +				return ret;
> +		}
> +
> +		/* We have a spinlock and interrupts disabled, so we must pass
> +		 * atomic context to this function, which may allocate memory.
> +		 */
> +		spin_lock_irqsave(&xhci->lock, flags);
> +		if (xhci->xhc_state & XHCI_STATE_DYING)
> +			goto dying;
> +		ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
> +				slot_id, ep_index);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +	} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
> +		spin_lock_irqsave(&xhci->lock, flags);
> +		if (xhci->xhc_state & XHCI_STATE_DYING)
> +			goto dying;
> +		ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
> +				slot_id, ep_index);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +	} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
> +		spin_lock_irqsave(&xhci->lock, flags);
> +		if (xhci->xhc_state & XHCI_STATE_DYING)
> +			goto dying;
> +		ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
> +				slot_id, ep_index);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +	} else {
> +		ret = -EINVAL;
> +	}
> +exit:
> +	return ret;
> +dying:
> +	xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
> +			"non-responsive xHCI host.\n",
> +			urb->ep->desc.bEndpointAddress, urb);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +	return -ESHUTDOWN;
> +}
> +
> +/*
> + * Remove the URB's TD from the endpoint ring.  This may cause the HC to stop
> + * USB transfers, potentially stopping in the middle of a TRB buffer.  The HC
> + * should pick up where it left off in the TD, unless a Set Transfer Ring
> + * Dequeue Pointer is issued.
> + *
> + * The TRBs that make up the buffers for the canceled URB will be "removed" from
> + * the ring.  Since the ring is a contiguous structure, they can't be physically
> + * removed.  Instead, there are two options:
> + *
> + *  1) If the HC is in the middle of processing the URB to be canceled, we
> + *     simply move the ring's dequeue pointer past those TRBs using the Set
> + *     Transfer Ring Dequeue Pointer command.  This will be the common case,
> + *     when drivers timeout on the last submitted URB and attempt to cancel.
> + *
> + *  2) If the HC is in the middle of a different TD, we turn the TRBs into a
> + *     series of 1-TRB transfer no-op TDs.  (No-ops shouldn't be chained.)  The
> + *     HC will need to invalidate the any TRBs it has cached after the stop
> + *     endpoint command, as noted in the xHCI 0.95 errata.
> + *
> + *  3) The TD may have completed by the time the Stop Endpoint Command
> + *     completes, so software needs to handle that case too.
> + *
> + * This function should protect against the TD enqueueing code ringing the
> + * doorbell while this code is waiting for a Stop Endpoint command to complete.
> + * It also needs to account for multiple cancellations on happening at the same
> + * time for the same endpoint.
> + *
> + * Note that this function can be called in any context, or so says
> + * usb_hcd_unlink_urb()
> + */
> +int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
> +{
> +	unsigned long flags;
> +	int ret;
> +	u32 temp;
> +	struct xhci_hcd *xhci;
> +	struct xhci_td *td;
> +	unsigned int ep_index;
> +	struct xhci_ring *ep_ring;
> +	struct xhci_virt_ep *ep;
> +
> +	xhci = hcd_to_xhci(hcd);
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	/* Make sure the URB hasn't completed or been unlinked already */
> +	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
> +	if (ret || !urb->hcpriv)
> +		goto done;
> +	temp = xhci_readl(xhci, &xhci->op_regs->status);
> +	if (temp == 0xffffffff) {
> +		xhci_dbg(xhci, "HW died, freeing TD.\n");
> +		td = (struct xhci_td *) urb->hcpriv;
> +
> +		usb_hcd_unlink_urb_from_ep(hcd, urb);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, -ESHUTDOWN);
> +		kfree(td);
> +		return ret;
> +	}
> +	if (xhci->xhc_state & XHCI_STATE_DYING) {
> +		xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
> +				"non-responsive xHCI host.\n",
> +				urb->ep->desc.bEndpointAddress, urb);
> +		/* Let the stop endpoint command watchdog timer (which set this
> +		 * state) finish cleaning up the endpoint TD lists.  We must
> +		 * have caught it in the middle of dropping a lock and giving
> +		 * back an URB.
> +		 */
> +		goto done;
> +	}
> +
> +	xhci_dbg(xhci, "Cancel URB %p\n", urb);
> +	xhci_dbg(xhci, "Event ring:\n");
> +	xhci_debug_ring(xhci, xhci->event_ring);
> +	ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> +	ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
> +	ep_ring = ep->ring;
> +	xhci_dbg(xhci, "Endpoint ring:\n");
> +	xhci_debug_ring(xhci, ep_ring);
> +	td = (struct xhci_td *) urb->hcpriv;
> +
> +	list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
> +	/* Queue a stop endpoint command, but only if this is
> +	 * the first cancellation to be handled.
> +	 */
> +	if (!(ep->ep_state & EP_HALT_PENDING)) {
> +		ep->ep_state |= EP_HALT_PENDING;
> +		ep->stop_cmds_pending++;
> +		ep->stop_cmd_timer.expires = jiffies +
> +			XHCI_STOP_EP_CMD_TIMEOUT * HZ;
> +		add_timer(&ep->stop_cmd_timer);
> +		xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
> +		xhci_ring_cmd_db(xhci);
> +	}
> +done:
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +	return ret;
> +}
> +
> +/* Drop an endpoint from a new bandwidth configuration for this device.
> + * Only one call to this function is allowed per endpoint before
> + * check_bandwidth() or reset_bandwidth() must be called.
> + * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> + * add the endpoint to the schedule with possibly new parameters denoted by a
> + * different endpoint descriptor in usb_host_endpoint.
> + * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> + * not allowed.
> + *
> + * The USB core will not allow URBs to be queued to an endpoint that is being
> + * disabled, so there's no need for mutual exclusion to protect
> + * the xhci->devs[slot_id] structure.
> + */
> +int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> +		struct usb_host_endpoint *ep)
> +{
> +	struct xhci_hcd *xhci;
> +	struct xhci_container_ctx *in_ctx, *out_ctx;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	struct xhci_slot_ctx *slot_ctx;
> +	unsigned int last_ctx;
> +	unsigned int ep_index;
> +	struct xhci_ep_ctx *ep_ctx;
> +	u32 drop_flag;
> +	u32 new_add_flags, new_drop_flags, new_slot_info;
> +	int ret;
> +
> +	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> +	if (ret <= 0)
> +		return ret;
> +	xhci = hcd_to_xhci(hcd);
> +	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> +
> +	drop_flag = xhci_get_endpoint_flag(&ep->desc);
> +	if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
> +		xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
> +				__func__, drop_flag);
> +		return 0;
> +	}
> +
> +	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> +		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> +				__func__);
> +		return -EINVAL;
> +	}
> +
> +	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> +	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> +	ep_index = xhci_get_endpoint_index(&ep->desc);
> +	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> +	/* If the HC already knows the endpoint is disabled,
> +	 * or the HCD has noted it is disabled, ignore this request
> +	 */
> +	if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
> +			ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
> +		xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
> +				__func__, ep);
> +		return 0;
> +	}
> +
> +	ctrl_ctx->drop_flags |= drop_flag;
> +	new_drop_flags = ctrl_ctx->drop_flags;
> +
> +	ctrl_ctx->add_flags &= ~drop_flag;
> +	new_add_flags = ctrl_ctx->add_flags;
> +
> +	last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
> +	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> +	/* Update the last valid endpoint context, if we deleted the last one */
> +	if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
> +		slot_ctx->dev_info &= ~LAST_CTX_MASK;
> +		slot_ctx->dev_info |= LAST_CTX(last_ctx);
> +	}
> +	new_slot_info = slot_ctx->dev_info;
> +
> +	xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
> +
> +	xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> +			(unsigned int) ep->desc.bEndpointAddress,
> +			udev->slot_id,
> +			(unsigned int) new_drop_flags,
> +			(unsigned int) new_add_flags,
> +			(unsigned int) new_slot_info);
> +	return 0;
> +}
> +
> +/* Add an endpoint to a new possible bandwidth configuration for this device.
> + * Only one call to this function is allowed per endpoint before
> + * check_bandwidth() or reset_bandwidth() must be called.
> + * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> + * add the endpoint to the schedule with possibly new parameters denoted by a
> + * different endpoint descriptor in usb_host_endpoint.
> + * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> + * not allowed.
> + *
> + * The USB core will not allow URBs to be queued to an endpoint until the
> + * configuration or alt setting is installed in the device, so there's no need
> + * for mutual exclusion to protect the xhci->devs[slot_id] structure.
> + */
> +int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> +		struct usb_host_endpoint *ep)
> +{
> +	struct xhci_hcd *xhci;
> +	struct xhci_container_ctx *in_ctx, *out_ctx;
> +	unsigned int ep_index;
> +	struct xhci_ep_ctx *ep_ctx;
> +	struct xhci_slot_ctx *slot_ctx;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	u32 added_ctxs;
> +	unsigned int last_ctx;
> +	u32 new_add_flags, new_drop_flags, new_slot_info;
> +	int ret = 0;
> +
> +	ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> +	if (ret <= 0) {
> +		/* So we won't queue a reset ep command for a root hub */
> +		ep->hcpriv = NULL;
> +		return ret;
> +	}
> +	xhci = hcd_to_xhci(hcd);
> +
> +	added_ctxs = xhci_get_endpoint_flag(&ep->desc);
> +	last_ctx = xhci_last_valid_endpoint(added_ctxs);
> +	if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
> +		/* FIXME when we have to issue an evaluate endpoint command to
> +		 * deal with ep0 max packet size changing once we get the
> +		 * descriptors
> +		 */
> +		xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
> +				__func__, added_ctxs);
> +		return 0;
> +	}
> +
> +	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> +		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> +				__func__);
> +		return -EINVAL;
> +	}
> +
> +	in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> +	out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> +	ep_index = xhci_get_endpoint_index(&ep->desc);
> +	ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> +	/* If the HCD has already noted the endpoint is enabled,
> +	 * ignore this request.
> +	 */
> +	if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
> +		xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
> +				__func__, ep);
> +		return 0;
> +	}
> +
> +	/*
> +	 * Configuration and alternate setting changes must be done in
> +	 * process context, not interrupt context (or so documenation
> +	 * for usb_set_interface() and usb_set_configuration() claim).
> +	 */
> +	if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
> +				udev, ep, GFP_NOIO) < 0) {
> +		dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
> +				__func__, ep->desc.bEndpointAddress);
> +		return -ENOMEM;
> +	}
> +
> +	ctrl_ctx->add_flags |= added_ctxs;
> +	new_add_flags = ctrl_ctx->add_flags;
> +
> +	/* If xhci_endpoint_disable() was called for this endpoint, but the
> +	 * xHC hasn't been notified yet through the check_bandwidth() call,
> +	 * this re-adds a new state for the endpoint from the new endpoint
> +	 * descriptors.  We must drop and re-add this endpoint, so we leave the
> +	 * drop flags alone.
> +	 */
> +	new_drop_flags = ctrl_ctx->drop_flags;
> +
> +	slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> +	/* Update the last valid endpoint context, if we just added one past */
> +	if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
> +		slot_ctx->dev_info &= ~LAST_CTX_MASK;
> +		slot_ctx->dev_info |= LAST_CTX(last_ctx);
> +	}
> +	new_slot_info = slot_ctx->dev_info;
> +
> +	/* Store the usb_device pointer for later use */
> +	ep->hcpriv = udev;
> +
> +	xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> +			(unsigned int) ep->desc.bEndpointAddress,
> +			udev->slot_id,
> +			(unsigned int) new_drop_flags,
> +			(unsigned int) new_add_flags,
> +			(unsigned int) new_slot_info);
> +	return 0;
> +}
> +
> +static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
> +{
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	struct xhci_ep_ctx *ep_ctx;
> +	struct xhci_slot_ctx *slot_ctx;
> +	int i;
> +
> +	/* When a device's add flag and drop flag are zero, any subsequent
> +	 * configure endpoint command will leave that endpoint's state
> +	 * untouched.  Make sure we don't leave any old state in the input
> +	 * endpoint contexts.
> +	 */
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> +	ctrl_ctx->drop_flags = 0;
> +	ctrl_ctx->add_flags = 0;
> +	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> +	slot_ctx->dev_info &= ~LAST_CTX_MASK;
> +	/* Endpoint 0 is always valid */
> +	slot_ctx->dev_info |= LAST_CTX(1);
> +	for (i = 1; i < 31; ++i) {
> +		ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
> +		ep_ctx->ep_info = 0;
> +		ep_ctx->ep_info2 = 0;
> +		ep_ctx->deq = 0;
> +		ep_ctx->tx_info = 0;
> +	}
> +}
> +
> +static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
> +		struct usb_device *udev, int *cmd_status)
> +{
> +	int ret;
> +
> +	switch (*cmd_status) {
> +	case COMP_ENOMEM:
> +		dev_warn(&udev->dev, "Not enough host controller resources "
> +				"for new device state.\n");
> +		ret = -ENOMEM;
> +		/* FIXME: can we allocate more resources for the HC? */
> +		break;
> +	case COMP_BW_ERR:
> +		dev_warn(&udev->dev, "Not enough bandwidth "
> +				"for new device state.\n");
> +		ret = -ENOSPC;
> +		/* FIXME: can we go back to the old state? */
> +		break;
> +	case COMP_TRB_ERR:
> +		/* the HCD set up something wrong */
> +		dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
> +				"add flag = 1, "
> +				"and endpoint is not disabled.\n");
> +		ret = -EINVAL;
> +		break;
> +	case COMP_SUCCESS:
> +		dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
> +		ret = 0;
> +		break;
> +	default:
> +		xhci_err(xhci, "ERROR: unexpected command completion "
> +				"code 0x%x.\n", *cmd_status);
> +		ret = -EINVAL;
> +		break;
> +	}
> +	return ret;
> +}
> +
> +static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
> +		struct usb_device *udev, int *cmd_status)
> +{
> +	int ret;
> +	struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
> +
> +	switch (*cmd_status) {
> +	case COMP_EINVAL:
> +		dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
> +				"context command.\n");
> +		ret = -EINVAL;
> +		break;
> +	case COMP_EBADSLT:
> +		dev_warn(&udev->dev, "WARN: slot not enabled for"
> +				"evaluate context command.\n");
> +	case COMP_CTX_STATE:
> +		dev_warn(&udev->dev, "WARN: invalid context state for "
> +				"evaluate context command.\n");
> +		xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
> +		ret = -EINVAL;
> +		break;
> +	case COMP_SUCCESS:
> +		dev_dbg(&udev->dev, "Successful evaluate context command\n");
> +		ret = 0;
> +		break;
> +	default:
> +		xhci_err(xhci, "ERROR: unexpected command completion "
> +				"code 0x%x.\n", *cmd_status);
> +		ret = -EINVAL;
> +		break;
> +	}
> +	return ret;
> +}
> +
> +/* Issue a configure endpoint command or evaluate context command
> + * and wait for it to finish.
> + */
> +static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> +		struct usb_device *udev,
> +		struct xhci_command *command,
> +		bool ctx_change, bool must_succeed)
> +{
> +	int ret;
> +	int timeleft;
> +	unsigned long flags;
> +	struct xhci_container_ctx *in_ctx;
> +	struct completion *cmd_completion;
> +	int *cmd_status;
> +	struct xhci_virt_device *virt_dev;
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	virt_dev = xhci->devs[udev->slot_id];
> +	if (command) {
> +		in_ctx = command->in_ctx;
> +		cmd_completion = command->completion;
> +		cmd_status = &command->status;
> +		command->command_trb = xhci->cmd_ring->enqueue;
> +		list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
> +	} else {
> +		in_ctx = virt_dev->in_ctx;
> +		cmd_completion = &virt_dev->cmd_completion;
> +		cmd_status = &virt_dev->cmd_status;
> +	}
> +
> +	if (!ctx_change)
> +		ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
> +				udev->slot_id, must_succeed);
> +	else
> +		ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
> +				udev->slot_id);
> +	if (ret < 0) {
> +		if (command)
> +			list_del(&command->cmd_list);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
> +		return -ENOMEM;
> +	}
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	/* Wait for the configure endpoint command to complete */
> +	timeleft = wait_for_completion_interruptible_timeout(
> +			cmd_completion,
> +			USB_CTRL_SET_TIMEOUT);
> +	if (timeleft <= 0) {
> +		xhci_warn(xhci, "%s while waiting for %s command\n",
> +				timeleft == 0 ? "Timeout" : "Signal",
> +				ctx_change == 0 ?
> +					"configure endpoint" :
> +					"evaluate context");
> +		/* FIXME cancel the configure endpoint command */
> +		return -ETIME;
> +	}
> +
> +	if (!ctx_change)
> +		return xhci_configure_endpoint_result(xhci, udev, cmd_status);
> +	return xhci_evaluate_context_result(xhci, udev, cmd_status);
> +}
> +
> +/* Called after one or more calls to xhci_add_endpoint() or
> + * xhci_drop_endpoint().  If this call fails, the USB core is expected
> + * to call xhci_reset_bandwidth().
> + *
> + * Since we are in the middle of changing either configuration or
> + * installing a new alt setting, the USB core won't allow URBs to be
> + * enqueued for any endpoint on the old config or interface.  Nothing
> + * else should be touching the xhci->devs[slot_id] structure, so we
> + * don't need to take the xhci->lock for manipulating that.
> + */
> +int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	int i;
> +	int ret = 0;
> +	struct xhci_hcd *xhci;
> +	struct xhci_virt_device	*virt_dev;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	struct xhci_slot_ctx *slot_ctx;
> +
> +	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> +	if (ret <= 0)
> +		return ret;
> +	xhci = hcd_to_xhci(hcd);
> +
> +	if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
> +		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> +				__func__);
> +		return -EINVAL;
> +	}
> +	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> +	virt_dev = xhci->devs[udev->slot_id];
> +
> +	/* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> +	ctrl_ctx->add_flags |= SLOT_FLAG;
> +	ctrl_ctx->add_flags &= ~EP0_FLAG;
> +	ctrl_ctx->drop_flags &= ~SLOT_FLAG;
> +	ctrl_ctx->drop_flags &= ~EP0_FLAG;
> +	xhci_dbg(xhci, "New Input Control Context:\n");
> +	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> +	xhci_dbg_ctx(xhci, virt_dev->in_ctx,
> +			LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> +
> +	ret = xhci_configure_endpoint(xhci, udev, NULL,
> +			false, false);
> +	if (ret) {
> +		/* Callee should call reset_bandwidth() */
> +		return ret;
> +	}
> +
> +	xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
> +	xhci_dbg_ctx(xhci, virt_dev->out_ctx,
> +			LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> +
> +	xhci_zero_in_ctx(xhci, virt_dev);
> +	/* Install new rings and free or cache any old rings */
> +	for (i = 1; i < 31; ++i) {
> +		if (!virt_dev->eps[i].new_ring)
> +			continue;
> +		/* Only cache or free the old ring if it exists.
> +		 * It may not if this is the first add of an endpoint.
> +		 */
> +		if (virt_dev->eps[i].ring) {
> +			xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> +		}
> +		virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
> +		virt_dev->eps[i].new_ring = NULL;
> +	}
> +
> +	return ret;
> +}
> +
> +void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	struct xhci_hcd *xhci;
> +	struct xhci_virt_device	*virt_dev;
> +	int i, ret;
> +
> +	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> +	if (ret <= 0)
> +		return;
> +	xhci = hcd_to_xhci(hcd);
> +
> +	if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> +		xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> +				__func__);
> +		return;
> +	}
> +	xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> +	virt_dev = xhci->devs[udev->slot_id];
> +	/* Free any rings allocated for added endpoints */
> +	for (i = 0; i < 31; ++i) {
> +		if (virt_dev->eps[i].new_ring) {
> +			xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
> +			virt_dev->eps[i].new_ring = NULL;
> +		}
> +	}
> +	xhci_zero_in_ctx(xhci, virt_dev);
> +}
> +
> +static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
> +		struct xhci_container_ctx *in_ctx,
> +		struct xhci_container_ctx *out_ctx,
> +		u32 add_flags, u32 drop_flags)
> +{
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> +	ctrl_ctx->add_flags = add_flags;
> +	ctrl_ctx->drop_flags = drop_flags;
> +	xhci_slot_copy(xhci, in_ctx, out_ctx);
> +	ctrl_ctx->add_flags |= SLOT_FLAG;
> +
> +	xhci_dbg(xhci, "Input Context:\n");
> +	xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
> +}
> +
> +void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
> +		unsigned int slot_id, unsigned int ep_index,
> +		struct xhci_dequeue_state *deq_state)
> +{
> +	struct xhci_container_ctx *in_ctx;
> +	struct xhci_ep_ctx *ep_ctx;
> +	u32 added_ctxs;
> +	dma_addr_t addr;
> +
> +	xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> +			xhci->devs[slot_id]->out_ctx, ep_index);
> +	in_ctx = xhci->devs[slot_id]->in_ctx;
> +	ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> +	addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
> +			deq_state->new_deq_ptr);
> +	if (addr == 0) {
> +		xhci_warn(xhci, "WARN Cannot submit config ep after "
> +				"reset ep command\n");
> +		xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
> +				deq_state->new_deq_seg,
> +				deq_state->new_deq_ptr);
> +		return;
> +	}
> +	ep_ctx->deq = addr | deq_state->new_cycle_state;
> +
> +	added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
> +	xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
> +			xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
> +}
> +
> +void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
> +		struct usb_device *udev, unsigned int ep_index)
> +{
> +	struct xhci_dequeue_state deq_state;
> +	struct xhci_virt_ep *ep;
> +
> +	xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
> +	ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> +	/* We need to move the HW's dequeue pointer past this TD,
> +	 * or it will attempt to resend it on the next doorbell ring.
> +	 */
> +	xhci_find_new_dequeue_state(xhci, udev->slot_id,
> +			ep_index, ep->stopped_td,
> +			&deq_state);
> +
> +	/* HW with the reset endpoint quirk will use the saved dequeue state to
> +	 * issue a configure endpoint command later.
> +	 */
> +	if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
> +		xhci_dbg(xhci, "Queueing new dequeue state\n");
> +		xhci_queue_new_dequeue_state(xhci, udev->slot_id,
> +				ep_index, &deq_state);
> +	} else {
> +		/* Better hope no one uses the input context between now and the
> +		 * reset endpoint completion!
> +		 */
> +		xhci_dbg(xhci, "Setting up input context for "
> +				"configure endpoint command\n");
> +		xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
> +				ep_index, &deq_state);
> +	}
> +}
> +
> +/* Deal with stalled endpoints.  The core should have sent the control message
> + * to clear the halt condition.  However, we need to make the xHCI hardware
> + * reset its sequence number, since a device will expect a sequence number of
> + * zero after the halt condition is cleared.
> + * Context: in_interrupt
> + */
> +void xhci_endpoint_reset(struct usb_hcd *hcd,
> +		struct usb_host_endpoint *ep)
> +{
> +	struct xhci_hcd *xhci;
> +	struct usb_device *udev;
> +	unsigned int ep_index;
> +	unsigned long flags;
> +	int ret;
> +	struct xhci_virt_ep *virt_ep;
> +
> +	xhci = hcd_to_xhci(hcd);
> +	udev = (struct usb_device *) ep->hcpriv;
> +	/* Called with a root hub endpoint (or an endpoint that wasn't added
> +	 * with xhci_add_endpoint()
> +	 */
> +	if (!ep->hcpriv)
> +		return;
> +	ep_index = xhci_get_endpoint_index(&ep->desc);
> +	virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> +	if (!virt_ep->stopped_td) {
> +		xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
> +				ep->desc.bEndpointAddress);
> +		return;
> +	}
> +	if (usb_endpoint_xfer_control(&ep->desc)) {
> +		xhci_dbg(xhci, "Control endpoint stall already handled.\n");
> +		return;
> +	}
> +
> +	xhci_dbg(xhci, "Queueing reset endpoint command\n");
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
> +	/*
> +	 * Can't change the ring dequeue pointer until it's transitioned to the
> +	 * stopped state, which is only upon a successful reset endpoint
> +	 * command.  Better hope that last command worked!
> +	 */
> +	if (!ret) {
> +		xhci_cleanup_stalled_ring(xhci, udev, ep_index);
> +		kfree(virt_ep->stopped_td);
> +		xhci_ring_cmd_db(xhci);
> +	}
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	if (ret)
> +		xhci_warn(xhci, "FIXME allocate a new ring segment\n");
> +}
> +
> +/*
> + * This submits a Reset Device Command, which will set the device state to 0,
> + * set the device address to 0, and disable all the endpoints except the default
> + * control endpoint.  The USB core should come back and call
> + * xhci_address_device(), and then re-set up the configuration.  If this is
> + * called because of a usb_reset_and_verify_device(), then the old alternate
> + * settings will be re-installed through the normal bandwidth allocation
> + * functions.
> + *
> + * Wait for the Reset Device command to finish.  Remove all structures
> + * associated with the endpoints that were disabled.  Clear the input device
> + * structure?  Cache the rings?  Reset the control endpoint 0 max packet size?
> + */
> +int xhci_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	int ret, i;
> +	unsigned long flags;
> +	struct xhci_hcd *xhci;
> +	unsigned int slot_id;
> +	struct xhci_virt_device *virt_dev;
> +	struct xhci_command *reset_device_cmd;
> +	int timeleft;
> +	int last_freed_endpoint;
> +
> +	ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> +	if (ret <= 0)
> +		return ret;
> +	xhci = hcd_to_xhci(hcd);
> +	slot_id = udev->slot_id;
> +	virt_dev = xhci->devs[slot_id];
> +	if (!virt_dev) {
> +		xhci_dbg(xhci, "%s called with invalid slot ID %u\n",
> +				__func__, slot_id);
> +		return -EINVAL;
> +	}
> +
> +	xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
> +	/* Allocate the command structure that holds the struct completion.
> +	 * Assume we're in process context, since the normal device reset
> +	 * process has to wait for the device anyway.  Storage devices are
> +	 * reset as part of error handling, so use GFP_NOIO instead of
> +	 * GFP_KERNEL.
> +	 */
> +	reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
> +	if (!reset_device_cmd) {
> +		xhci_dbg(xhci, "Couldn't allocate command structure.\n");
> +		return -ENOMEM;
> +	}
> +
> +	/* Attempt to submit the Reset Device command to the command ring */
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
> +	list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
> +	ret = xhci_queue_reset_device(xhci, slot_id);
> +	if (ret) {
> +		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> +		list_del(&reset_device_cmd->cmd_list);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		goto command_cleanup;
> +	}
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	/* Wait for the Reset Device command to finish */
> +	timeleft = wait_for_completion_interruptible_timeout(
> +			reset_device_cmd->completion,
> +			USB_CTRL_SET_TIMEOUT);
> +	if (timeleft <= 0) {
> +		xhci_warn(xhci, "%s while waiting for reset device command\n",
> +				timeleft == 0 ? "Timeout" : "Signal");
> +		spin_lock_irqsave(&xhci->lock, flags);
> +		/* The timeout might have raced with the event ring handler, so
> +		 * only delete from the list if the item isn't poisoned.
> +		 */
> +		if (reset_device_cmd->cmd_list.next != LIST_POISON1)
> +			list_del(&reset_device_cmd->cmd_list);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		ret = -ETIME;
> +		goto command_cleanup;
> +	}
> +
> +	/* The Reset Device command can't fail, according to the 0.95/0.96 spec,
> +	 * unless we tried to reset a slot ID that wasn't enabled,
> +	 * or the device wasn't in the addressed or configured state.
> +	 */
> +	ret = reset_device_cmd->status;
> +	switch (ret) {
> +	case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
> +	case COMP_CTX_STATE: /* 0.96 completion code for same thing */
> +		xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
> +				slot_id,
> +				xhci_get_slot_state(xhci, virt_dev->out_ctx));
> +		xhci_info(xhci, "Not freeing device rings.\n");
> +		/* Don't treat this as an error.  May change my mind later. */
> +		ret = 0;
> +		goto command_cleanup;
> +	case COMP_SUCCESS:
> +		xhci_dbg(xhci, "Successful reset device command.\n");
> +		break;
> +	default:
> +		if (xhci_is_vendor_info_code(xhci, ret))
> +			break;
> +		xhci_warn(xhci, "Unknown completion code %u for "
> +				"reset device command.\n", ret);
> +		ret = -EINVAL;
> +		goto command_cleanup;
> +	}
> +
> +	/* Everything but endpoint 0 is disabled, so free or cache the rings. */
> +	last_freed_endpoint = 1;
> +	for (i = 1; i < 31; ++i) {
> +		if (!virt_dev->eps[i].ring)
> +			continue;
> +		xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> +		last_freed_endpoint = i;
> +	}
> +	xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
> +	xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
> +	ret = 0;
> +
> +command_cleanup:
> +	xhci_free_command(xhci, reset_device_cmd);
> +	return ret;
> +}
> +
> +/*
> + * At this point, the struct usb_device is about to go away, the device has
> + * disconnected, and all traffic has been stopped and the endpoints have been
> + * disabled.  Free any HC data structures associated with that device.
> + */
> +void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	struct xhci_virt_device *virt_dev;
> +	unsigned long flags;
> +	u32 state;
> +	int i;
> +
> +	if (udev->slot_id == 0)
> +		return;
> +	virt_dev = xhci->devs[udev->slot_id];
> +	if (!virt_dev)
> +		return;
> +
> +	/* Stop any wayward timer functions (which may grab the lock) */
> +	for (i = 0; i < 31; ++i) {
> +		virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
> +		del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
> +	}
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	/* Don't disable the slot if the host controller is dead. */
> +	state = xhci_readl(xhci, &xhci->op_regs->status);
> +	if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> +		xhci_free_virt_device(xhci, udev->slot_id);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		return;
> +	}
> +
> +	if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> +		return;
> +	}
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +	/*
> +	 * Event command completion handler will free any data structures
> +	 * associated with the slot.  XXX Can free sleep?
> +	 */
> +}
> +
> +/*
> + * Returns 0 if the xHC ran out of device slots, the Enable Slot command
> + * timed out, or allocating memory failed.  Returns 1 on success.
> + */
> +int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	unsigned long flags;
> +	int timeleft;
> +	int ret;
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
> +	if (ret) {
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> +		return 0;
> +	}
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	/* XXX: how much time for xHC slot assignment? */
> +	timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> +			USB_CTRL_SET_TIMEOUT);
> +	if (timeleft <= 0) {
> +		xhci_warn(xhci, "%s while waiting for a slot\n",
> +				timeleft == 0 ? "Timeout" : "Signal");
> +		/* FIXME cancel the enable slot request */
> +		return 0;
> +	}
> +
> +	if (!xhci->slot_id) {
> +		xhci_err(xhci, "Error while assigning device slot ID\n");
> +		return 0;
> +	}
> +	/* xhci_alloc_virt_device() does not touch rings; no need to lock */
> +	if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
> +		/* Disable slot, if we can do it without mem alloc */
> +		xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
> +		spin_lock_irqsave(&xhci->lock, flags);
> +		if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
> +			xhci_ring_cmd_db(xhci);
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		return 0;
> +	}
> +	udev->slot_id = xhci->slot_id;
> +	/* Is this a LS or FS device under a HS hub? */
> +	/* Hub or peripherial? */
> +	return 1;
> +}
> +
> +/*
> + * Issue an Address Device command (which will issue a SetAddress request to
> + * the device).
> + * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
> + * we should only issue and wait on one address command at the same time.
> + *
> + * We add one to the device address issued by the hardware because the USB core
> + * uses address 1 for the root hubs (even though they're not really devices).
> + */
> +int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> +	unsigned long flags;
> +	int timeleft;
> +	struct xhci_virt_device *virt_dev;
> +	int ret = 0;
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	struct xhci_slot_ctx *slot_ctx;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	u64 temp_64;
> +
> +	if (!udev->slot_id) {
> +		xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
> +		return -EINVAL;
> +	}
> +
> +	virt_dev = xhci->devs[udev->slot_id];
> +
> +	/* If this is a Set Address to an unconfigured device, setup ep 0 */
> +	if (!udev->config)
> +		xhci_setup_addressable_virt_dev(xhci, udev);
> +	/* Otherwise, assume the core has the device configured how it wants */
> +	xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> +	xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
> +					udev->slot_id);
> +	if (ret) {
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> +		return ret;
> +	}
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	/* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
> +	timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> +			USB_CTRL_SET_TIMEOUT);
> +	/* FIXME: From section 4.3.4: "Software shall be responsible for timing
> +	 * the SetAddress() "recovery interval" required by USB and aborting the
> +	 * command on a timeout.
> +	 */
> +	if (timeleft <= 0) {
> +		xhci_warn(xhci, "%s while waiting for a slot\n",
> +				timeleft == 0 ? "Timeout" : "Signal");
> +		/* FIXME cancel the address device command */
> +		return -ETIME;
> +	}
> +
> +	switch (virt_dev->cmd_status) {
> +	case COMP_CTX_STATE:
> +	case COMP_EBADSLT:
> +		xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
> +				udev->slot_id);
> +		ret = -EINVAL;
> +		break;
> +	case COMP_TX_ERR:
> +		dev_warn(&udev->dev, "Device not responding to set address.\n");
> +		ret = -EPROTO;
> +		break;
> +	case COMP_SUCCESS:
> +		xhci_dbg(xhci, "Successful Address Device command\n");
> +		break;
> +	default:
> +		xhci_err(xhci, "ERROR: unexpected command completion "
> +				"code 0x%x.\n", virt_dev->cmd_status);
> +		xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> +		xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> +		ret = -EINVAL;
> +		break;
> +	}
> +	if (ret) {
> +		return ret;
> +	}
> +	temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
> +	xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
> +	xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
> +			udev->slot_id,
> +			&xhci->dcbaa->dev_context_ptrs[udev->slot_id],
> +			(unsigned long long)
> +				xhci->dcbaa->dev_context_ptrs[udev->slot_id]);
> +	xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
> +			(unsigned long long)virt_dev->out_ctx->dma);
> +	xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> +	xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> +	xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> +	xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> +	/*
> +	 * USB core uses address 1 for the roothubs, so we add one to the
> +	 * address given back to us by the HC.
> +	 */
> +	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
> +	udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
> +	/* Zero the input context control for later use */
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> +	ctrl_ctx->add_flags = 0;
> +	ctrl_ctx->drop_flags = 0;
> +
> +	xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
> +	/* XXX Meh, not sure if anyone else but choose_address uses this. */
> +	set_bit(udev->devnum, udev->bus->devmap.devicemap);
> +
> +	return 0;
> +}
> +
> +/* Once a hub descriptor is fetched for a device, we need to update the xHC's
> + * internal data structures for the device.
> + */
> +int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
> +			struct usb_tt *tt, gfp_t mem_flags)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	struct xhci_virt_device *vdev;
> +	struct xhci_command *config_cmd;
> +	struct xhci_input_control_ctx *ctrl_ctx;
> +	struct xhci_slot_ctx *slot_ctx;
> +	unsigned long flags;
> +	unsigned think_time;
> +	int ret;
> +
> +	/* Ignore root hubs */
> +	if (!hdev->parent)
> +		return 0;
> +
> +	vdev = xhci->devs[hdev->slot_id];
> +	if (!vdev) {
> +		xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
> +		return -EINVAL;
> +	}
> +	config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
> +	if (!config_cmd) {
> +		xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
> +		return -ENOMEM;
> +	}
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
> +	ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
> +	ctrl_ctx->add_flags |= SLOT_FLAG;
> +	slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
> +	slot_ctx->dev_info |= DEV_HUB;
> +	if (tt->multi)
> +		slot_ctx->dev_info |= DEV_MTT;
> +	if (xhci->hci_version > 0x95) {
> +		xhci_dbg(xhci, "xHCI version %x needs hub "
> +				"TT think time and number of ports\n",
> +				(unsigned int) xhci->hci_version);
> +		slot_ctx->dev_info2 |= XHCI_MAX_PORTS(hdev->maxchild);
> +		/* Set TT think time - convert from ns to FS bit times.
> +		 * 0 = 8 FS bit times, 1 = 16 FS bit times,
> +		 * 2 = 24 FS bit times, 3 = 32 FS bit times.
> +		 */
> +		think_time = tt->think_time;
> +		if (think_time != 0)
> +			think_time = (think_time / 666) - 1;
> +		slot_ctx->tt_info |= TT_THINK_TIME(think_time);
> +	} else {
> +		xhci_dbg(xhci, "xHCI version %x doesn't need hub "
> +				"TT think time or number of ports\n",
> +				(unsigned int) xhci->hci_version);
> +	}
> +	slot_ctx->dev_state = 0;
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	xhci_dbg(xhci, "Set up %s for hub device.\n",
> +			(xhci->hci_version > 0x95) ?
> +			"configure endpoint" : "evaluate context");
> +	xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
> +	xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
> +
> +	/* Issue and wait for the configure endpoint or
> +	 * evaluate context command.
> +	 */
> +	if (xhci->hci_version > 0x95)
> +		ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> +				false, false);
> +	else
> +		ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> +				true, false);
> +
> +	xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
> +	xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
> +
> +	xhci_free_command(xhci, config_cmd);
> +	return ret;
> +}
> +
> +int xhci_get_frame(struct usb_hcd *hcd)
> +{
> +	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +	/* EHCI mods by the periodic size.  Why? */
> +	return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
> +}
> +
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_AUTHOR(DRIVER_AUTHOR);
> +MODULE_LICENSE("GPL");
> +
> +static int __init xhci_hcd_init(void)
> +{
> +#ifdef CONFIG_PCI
> +	int retval = 0;
> +
> +	retval = xhci_register_pci();
> +
> +	if (retval < 0) {
> +		printk(KERN_DEBUG "Problem registering PCI driver.");
> +		return retval;
> +	}
> +#endif
> +	/*
> +	 * Check the compiler generated sizes of structures that must be laid
> +	 * out in specific ways for hardware access.
> +	 */
> +	BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
> +	/* xhci_device_control has eight fields, and also
> +	 * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
> +	 */
> +	BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
> +	/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
> +	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
> +	BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> +	return 0;
> +}
> +module_init(xhci_hcd_init);
> +
> +static void __exit xhci_hcd_cleanup(void)
> +{
> +#ifdef CONFIG_PCI
> +	xhci_unregister_pci();
> +#endif
> +}
> +module_exit(xhci_hcd_cleanup);
--
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