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Message-ID: <1328503983.12669.50.camel@debian>
Date: Mon, 06 Feb 2012 12:53:03 +0800
From: "Alex,Shi" <alex.shi@...el.com>
To: Alan Stern <stern@...land.harvard.edu>,
gregkh <gregkh@...uxfoundation.org>
Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
Andiry Xu <andiry.xu@....com>, linux-usb@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: patch review: try setup MSI/MSIX in usb core
On Thu, 2012-02-02 at 09:04 +0800, Alex,Shi wrote:
> On Wed, 2012-02-01 at 10:33 +0800, Alex,Shi wrote:
> > On Thu, 2012-01-12 at 10:37 -0500, Alan Stern wrote:
> > > On Thu, 12 Jan 2012, Alex,Shi wrote:
> > >
> > > > Thanks, Sarah. I understand your concern now.
> > > > Maybe checking MSI first in usb_hcd_request_irqs is your favorite too,
> > > > right?
> > > >
> > > > I take a quick glance on the code. May we have 2 ways to implement it.
> > > >
> > > > A, move current xhci code and a few MSI related objects into usb_hcd
> > > > core code and structure. the skeleton like below.
> > >
> > > MSI is used only for PCI, right? Therefore we should try to keep as
> > > much as possible of the core MSI-related code in hcd-pci.c, not in
> > > hcd.c.
> > >
> >
> >
> > Considering all of your suggestions, I write a draft patch to enable
> > MSI/MSIX support in usb core. It base on my 2 patches that check MSI in
> > xhci driver.
> > The patch was tested with NEC uPD720200 usb 3.0 HCD and our Intel usb
> > 3.0 pantherpoint, and can resume from S3 mode.
> > Now it just open the MSI checking for XHCI driver. but other driver is
> > easy to enable this capability by assign HCD_MSI_FIRST on driver's
> > flags.
> >
> > Be leaking of enough knowledge of USB and hardware ENV, there are still
> > some problems didn't resolved, like how to get the max msix counter
> > during hcd pci probe? testing on some platforms without PCI bus.
> >
> > But I know there should lots of suggestions and comments on the problems
> > and for this patch, So, sent it out. :)
>
> Any suggestion or comments on this patch?
Updated patch with getting msix interrupts number function adding.
May usb2/usb3 needs different getting way, so, define it in hc_driver.
This patch is also tested with S3 resume on NEC uPD720200 HCD and Intel
3.0 pantherpoint HCD.
CC to linux-kernel for comments.
---------------
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index d6369a4..a58ab53 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -153,6 +153,219 @@ static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {}
/*-------------------------------------------------------------------------*/
+static int hcd_free_msix(struct usb_hcd *hcd)
+{
+ int i;
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+ if (!hcd->msix_entries) {
+ printk(KERN_ERR "No msix entries found!\n");
+ return -EINVAL;
+ }
+ for (i = 0; i < hcd->msix_count; i++)
+ if (hcd->msix_entries[i].vector)
+ free_irq(hcd->msix_entries[i].vector,
+ hcd);
+
+ pci_disable_msix(pdev);
+ kfree(hcd->msix_entries);
+ hcd->msix_entries = NULL;
+ hcd->msix_enabled = 0;
+
+ return 0;
+}
+static int hcd_free_msi(struct usb_hcd *hcd)
+{
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+ dev_dbg(&pdev->dev, "disable MSI interrupt\n");
+ pci_disable_msi(pdev);
+ return 0;
+}
+
+/* Free and disable msi/msix */
+void usb_hcd_free_msi_msix(struct usb_hcd *hcd)
+{
+ if (hcd->msix_entries)
+ hcd_free_msix(hcd);
+ else
+ hcd_free_msi(hcd);
+
+ return;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_free_msi_msix);
+
+void usb_hcd_msix_sync_irqs(struct usb_hcd *hcd)
+{
+ int i;
+ if (hcd->msix_entries) {
+ for (i = 0; i < hcd->msix_count; i++)
+ synchronize_irq(hcd->msix_entries[i].vector);
+ }
+
+}
+EXPORT_SYMBOL_GPL(usb_hcd_msix_sync_irqs);
+
+/*
+ * Set up MSI
+ */
+static int hcd_setup_msi(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ int ret;
+
+ ret = pci_enable_msi(pdev);
+ if (ret)
+ dev_dbg(&pdev->dev, "failed to allocate MSI entry\n");
+ return ret;
+}
+/*
+ * Set up MSI-X
+ */
+static int hcd_setup_msix(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ int i, ret = 0;
+
+ /*
+ * calculate number of msi-x vectors supported.
+ * - num_online_cpus: maximum msi-x vectors per CPUs core.
+ * Add additional 1 vector to ensure always available interrupt.
+ */
+ hcd->msix_count = min((int)num_online_cpus() + 1,
+ hcd->driver->get_msix_num(hcd));
+
+ hcd->msix_entries =
+ kmalloc((sizeof(struct msix_entry))*hcd->msix_count,
+ GFP_KERNEL);
+ if (!hcd->msix_entries) {
+ dev_err(&pdev->dev, "Failed to allocate MSI-X entries\n");
+ hcd->msix_count = 0;
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < hcd->msix_count; i++) {
+ hcd->msix_entries[i].entry = i;
+ hcd->msix_entries[i].vector = 0;
+ }
+
+ ret = pci_enable_msix(pdev, hcd->msix_entries, hcd->msix_count);
+ if (ret) {
+ dev_dbg(&pdev->dev, "Failed to enable MSI-X\n");
+ goto free_entries;
+ }
+
+ return ret;
+
+free_entries:
+ kfree(hcd->msix_entries);
+ hcd->msix_entries = NULL;
+ hcd->msix_count = 0;
+ return ret;
+}
+
+/* Device for a quirk */
+#define PCI_VENDOR_ID_FRESCO_LOGIC 0x1b73
+#define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
+
+/* Check for bad HCD devices, and driver desires for MSI.
+ * Now, only in xhci driver want it by HCD_MSI_FIRST setting.
+ * Other driver like ehci/uhci can follow this setting.
+ */
+static int hcd_no_msi(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
+ pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK) {
+
+ /* Fresco Logic confirms: all revisions of this chip do not
+ * support MSI, even though some of them claim to in their PCI
+ * capabilities.
+ */
+ dev_dbg(&pdev->dev, "QUIRK: Fresco Logic revision %u "
+ "has broken MSI implementation\n",
+ pdev->revision);
+ return 1;
+ } else if (!(hcd->driver->flags & HCD_MSI_FIRST))
+ return 1;
+
+ return 0;
+}
+
+/* setup msi/msix interrupts. if can not do this, fallback to line irq */
+static int hcd_setup_int(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ int ret;
+
+ hcd->irq = -1;
+
+ if (!hcd_no_msi(pdev, hcd)) {
+
+ ret = hcd_setup_msix(pdev, hcd);
+ if (ret)
+ /* fall back to msi*/
+ ret = hcd_setup_msi(pdev, hcd);
+
+ if (!ret)
+ /* hcd->irq is -1, we have MSI */
+ return 0;
+ }
+
+ if (!pdev->irq) {
+ dev_err(&pdev->dev, "No msi or line irq found!\n");
+ return -1;
+ }
+ /* fallback to line irq */
+ hcd->irq = pdev->irq;
+ return 0;
+}
+
+/* msi irq handler should be here, if driver has */
+irqreturn_t hcd_msi_irq(int irq, struct usb_hcd *hcd)
+{
+ return hcd->driver->irq(hcd);
+}
+
+int usb_hcd_request_msi_msix_irqs(struct usb_hcd *hcd, unsigned int irqnum,
+ unsigned long irqflags)
+{
+ int retval = 1;
+ if (hcd->msix_entries && hcd->driver->irq) {
+ int i;
+ /* register hc_driver's irq handler */
+ for (i = 0; i < hcd->msix_count; i++) {
+ retval = request_irq(hcd->msix_entries[i].vector,
+ (irq_handler_t)hcd_msi_irq,
+ 0, hcd->driver->description, hcd);
+ if (retval) {
+ hcd_free_msix(hcd);
+ break;
+ }
+ }
+ if (i == hcd->msix_count)
+ hcd->msix_enabled = 1;
+ } else if (hcd->irq == -1) {
+ /* use msi */
+ retval = request_irq(irqnum, (irq_handler_t)hcd_msi_irq,
+ 0, hcd->driver->description, hcd);
+ if (retval)
+ hcd_free_msi(hcd);
+ }
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_request_msi_msix_irqs);
+
+/* setup msi/msix interrupts and requestion irqs for them */
+int usb_hcd_register_msi_msix_irqs(struct usb_hcd *hcd)
+{
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+ int ret = -1;
+
+ if (!hcd_setup_int(pdev, hcd))
+ ret = usb_hcd_request_msi_msix_irqs(hcd,
+ pdev->irq, IRQF_SHARED);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_hcd_register_msi_msix_irqs);
+
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
@@ -243,6 +456,11 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
pci_set_master(dev);
+ /* try enable MSI, if fail, seek line irq */
+ retval = hcd_setup_int(dev, hcd);
+ if (retval != 0)
+ goto unmap_registers;
+
retval = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
if (retval != 0)
goto unmap_registers;
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index b3a7920..8b5f7bb 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2322,7 +2322,7 @@ int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
}
EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
-static int usb_hcd_request_irqs(struct usb_hcd *hcd,
+static int usb_hcd_request_default_irqs(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags)
{
int retval;
@@ -2362,6 +2362,17 @@ static int usb_hcd_request_irqs(struct usb_hcd *hcd,
return 0;
}
+int usb_hcd_request_irqs(struct usb_hcd *hcd, unsigned int irqnum,
+ unsigned long irqflags)
+{
+ int retval;
+ retval = usb_hcd_request_msi_msix_irqs(hcd, irqnum, irqflags);
+ if (retval)
+ retval = usb_hcd_request_default_irqs(hcd, irqnum, irqflags);
+
+ return retval;
+}
+
/**
* usb_add_hcd - finish generic HCD structure initialization and register
* @hcd: the usb_hcd structure to initialize
@@ -2447,11 +2458,8 @@ int usb_add_hcd(struct usb_hcd *hcd,
&& device_can_wakeup(&hcd->self.root_hub->dev))
dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
- /* enable irqs just before we start the controller, except MSI
- * first try HCD. That will do it in following driver->start();
- */
- if (usb_hcd_is_primary_hcd(hcd) &&
- !(hcd->driver->flags & HCD_MSI_FIRST)) {
+ /* enable irqs just before we start the controller */
+ if (usb_hcd_is_primary_hcd(hcd)) {
retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
if (retval)
goto err_request_irq;
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 5185ab7..f345a67 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -127,6 +127,7 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
return retval;
}
+
/*
* We need to register our own PCI probe function (instead of the USB core's
* function) in order to create a second roothub under xHCI.
@@ -255,6 +256,7 @@ static const struct hc_driver xhci_pci_hc_driver = {
*/
.reset = xhci_pci_setup,
.start = xhci_run,
+ .get_msix_num = xhci_get_msix_num,
#ifdef CONFIG_PM
.pci_suspend = xhci_pci_suspend,
.pci_resume = xhci_pci_resume,
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index c939f5f..51cdf72 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -176,210 +176,24 @@ int xhci_reset(struct xhci_hcd *xhci)
}
#ifdef CONFIG_PCI
-static int xhci_free_msi(struct xhci_hcd *xhci)
-{
- int i;
-
- if (!xhci->msix_entries)
- return -EINVAL;
-
- for (i = 0; i < xhci->msix_count; i++)
- if (xhci->msix_entries[i].vector)
- free_irq(xhci->msix_entries[i].vector,
- xhci_to_hcd(xhci));
- return 0;
-}
-
-/*
- * Set up MSI
- */
-static int xhci_setup_msi(struct xhci_hcd *xhci)
-{
- int ret;
- struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
-
- ret = pci_enable_msi(pdev);
- if (ret) {
- xhci_dbg(xhci, "failed to allocate MSI entry\n");
- return ret;
- }
-
- ret = request_irq(pdev->irq, (irq_handler_t)xhci_msi_irq,
- 0, "xhci_hcd", xhci_to_hcd(xhci));
- if (ret) {
- xhci_dbg(xhci, "disable MSI interrupt\n");
- pci_disable_msi(pdev);
- }
-
- return ret;
-}
-
-/*
- * Free IRQs
- * free all IRQs request
- */
-static void xhci_free_irq(struct xhci_hcd *xhci)
-{
- struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
- int ret;
-
- /* return if using legacy interrupt */
- if (xhci_to_hcd(xhci)->irq >= 0)
- return;
-
- ret = xhci_free_msi(xhci);
- if (!ret)
- return;
- if (pdev->irq >= 0)
- free_irq(pdev->irq, xhci_to_hcd(xhci));
-
- return;
-}
-
-/*
- * Set up MSI-X
- */
-static int xhci_setup_msix(struct xhci_hcd *xhci)
-{
- int i, ret = 0;
- struct usb_hcd *hcd = xhci_to_hcd(xhci);
- struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
-
- /*
- * calculate number of msi-x vectors supported.
- * - HCS_MAX_INTRS: the max number of interrupts the host can handle,
- * with max number of interrupters based on the xhci HCSPARAMS1.
- * - num_online_cpus: maximum msi-x vectors per CPUs core.
- * Add additional 1 vector to ensure always available interrupt.
- */
- xhci->msix_count = min(num_online_cpus() + 1,
- HCS_MAX_INTRS(xhci->hcs_params1));
-
- xhci->msix_entries =
- kmalloc((sizeof(struct msix_entry))*xhci->msix_count,
- GFP_KERNEL);
- if (!xhci->msix_entries) {
- xhci_err(xhci, "Failed to allocate MSI-X entries\n");
- return -ENOMEM;
- }
-
- for (i = 0; i < xhci->msix_count; i++) {
- xhci->msix_entries[i].entry = i;
- xhci->msix_entries[i].vector = 0;
- }
-
- ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
- if (ret) {
- xhci_dbg(xhci, "Failed to enable MSI-X\n");
- goto free_entries;
- }
-
- for (i = 0; i < xhci->msix_count; i++) {
- ret = request_irq(xhci->msix_entries[i].vector,
- (irq_handler_t)xhci_msi_irq,
- 0, "xhci_hcd", xhci_to_hcd(xhci));
- if (ret)
- goto disable_msix;
- }
-
- hcd->msix_enabled = 1;
- return ret;
-
-disable_msix:
- xhci_dbg(xhci, "disable MSI-X interrupt\n");
- xhci_free_irq(xhci);
- pci_disable_msix(pdev);
-free_entries:
- kfree(xhci->msix_entries);
- xhci->msix_entries = NULL;
- return ret;
-}
-
-/* Free any IRQs and disable MSI-X */
-static void xhci_cleanup_msix(struct xhci_hcd *xhci)
-{
- struct usb_hcd *hcd = xhci_to_hcd(xhci);
- struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
-
- xhci_free_irq(xhci);
-
- if (xhci->msix_entries) {
- pci_disable_msix(pdev);
- kfree(xhci->msix_entries);
- xhci->msix_entries = NULL;
- } else {
- pci_disable_msi(pdev);
- }
-
- hcd->msix_enabled = 0;
- return;
-}
static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
{
- int i;
-
- if (xhci->msix_entries) {
- for (i = 0; i < xhci->msix_count; i++)
- synchronize_irq(xhci->msix_entries[i].vector);
- }
+ usb_hcd_msix_sync_irqs(xhci_to_hcd(xhci));
}
-static int xhci_try_enable_msi(struct usb_hcd *hcd)
+/* called in interrupt setup during pci probe() */
+int xhci_get_msix_num(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
- struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
- int ret;
-
- /*
- * Some Fresco Logic host controllers advertise MSI, but fail to
- * generate interrupts. Don't even try to enable MSI.
- */
- if (xhci->quirks & XHCI_BROKEN_MSI)
- return 0;
-
- /* unregister the legacy interrupt */
- if (hcd->irq)
- free_irq(hcd->irq, hcd);
- hcd->irq = -1;
- ret = xhci_setup_msix(xhci);
- if (ret)
- /* fall back to msi*/
- ret = xhci_setup_msi(xhci);
-
- if (!ret)
- /* hcd->irq is -1, we have MSI */
- return 0;
-
- if (!pdev->irq) {
- xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
- return -EINVAL;
- }
-
- /* fall back to legacy interrupt*/
- ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
- hcd->irq_descr, hcd);
- if (ret) {
- xhci_err(xhci, "request interrupt %d failed\n",
- pdev->irq);
- return ret;
- }
- hcd->irq = pdev->irq;
- return 0;
+ /* dangerous: xhci is null, but it's useless in xhci_readl function */
+ return HCS_MAX_INTRS(xhci_readl(xhci,
+ &((struct xhci_cap_regs*)hcd->regs)->hcs_params1));
}
#else
-static int xhci_try_enable_msi(struct usb_hcd *hcd)
-{
- return 0;
-}
-
-static void xhci_cleanup_msix(struct xhci_hcd *xhci)
-{
-}
-
static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
{
}
@@ -411,7 +225,6 @@ int xhci_init(struct usb_hcd *hcd)
return retval;
}
-
/*-------------------------------------------------------------------------*/
@@ -497,7 +310,6 @@ int xhci_run(struct usb_hcd *hcd)
{
u32 temp;
u64 temp_64;
- int ret;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
/* Start the xHCI host controller running only after the USB 2.0 roothub
@@ -510,10 +322,6 @@ int xhci_run(struct usb_hcd *hcd)
xhci_dbg(xhci, "xhci_run\n");
- ret = xhci_try_enable_msi(hcd);
- if (ret)
- return ret;
-
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
init_timer(&xhci->event_ring_timer);
xhci->event_ring_timer.data = (unsigned long) xhci;
@@ -609,7 +417,7 @@ void xhci_stop(struct usb_hcd *hcd)
xhci_reset(xhci);
spin_unlock_irq(&xhci->lock);
- xhci_cleanup_msix(xhci);
+ usb_hcd_free_msi_msix(hcd);
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
/* Tell the event ring poll function not to reschedule */
@@ -651,7 +459,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
xhci_halt(xhci);
spin_unlock_irq(&xhci->lock);
- xhci_cleanup_msix(xhci);
+ usb_hcd_free_msi_msix(hcd);
xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
xhci_readl(xhci, &xhci->op_regs->status));
@@ -853,7 +661,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
xhci_halt(xhci);
xhci_reset(xhci);
spin_unlock_irq(&xhci->lock);
- xhci_cleanup_msix(xhci);
+ usb_hcd_free_msi_msix(hcd);
#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
/* Tell the event ring poll function not to reschedule */
@@ -888,7 +696,11 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
if (retval)
return retval;
xhci_dbg(xhci, "Start the primary HCD\n");
- retval = xhci_run(hcd->primary_hcd);
+ if (dev_is_pci(hcd->self.controller))
+ retval = usb_hcd_register_msi_msix_irqs(
+ hcd->primary_hcd);
+ if (!retval)
+ retval = xhci_run(hcd->primary_hcd);
if (!retval) {
xhci_dbg(xhci, "Start the secondary HCD\n");
retval = xhci_run(secondary_hcd);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index fb99c83..d13baf1 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1388,9 +1388,6 @@ struct xhci_hcd {
int page_size;
/* Valid values are 12 to 20, inclusive */
int page_shift;
- /* msi-x vectors */
- int msix_count;
- struct msix_entry *msix_entries;
/* data structures */
struct xhci_device_context_array *dcbaa;
struct xhci_ring *cmd_ring;
@@ -1643,9 +1640,11 @@ void xhci_free_command(struct xhci_hcd *xhci,
/* xHCI PCI glue */
int xhci_register_pci(void);
void xhci_unregister_pci(void);
+int xhci_get_msix_num(struct usb_hcd *hcd);
#else
static inline int xhci_register_pci(void) { return 0; }
static inline void xhci_unregister_pci(void) {}
+static inline int xhci_get_msix_num(struct usb_hcd *hcd){ return 0; }
#endif
/* xHCI host controller glue */
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 2cc8673..f33c215 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -22,6 +22,7 @@
#ifdef __KERNEL__
#include <linux/rwsem.h>
+#include <linux/pci.h> /* for struct msix_entry */
#define MAX_TOPO_LEVEL 6
@@ -133,6 +134,12 @@ struct usb_hcd {
u64 rsrc_len; /* memory/io resource length */
unsigned power_budget; /* in mA, 0 = no limit */
+#ifdef CONFIG_PCI
+ /* msi-x vectors */
+ int msix_count;
+ struct msix_entry *msix_entries;
+#endif
+
/* bandwidth_mutex should be taken before adding or removing
* any new bus bandwidth constraints:
* 1. Before adding a configuration for a new device.
@@ -219,6 +226,7 @@ struct hc_driver {
/* called to init HCD and root hub */
int (*reset) (struct usb_hcd *hcd);
int (*start) (struct usb_hcd *hcd);
+ int (*get_msix_num) (struct usb_hcd *hcd);
/* NOTE: these suspend/resume calls relate to the HC as
* a whole, not just the root hub; they're for PCI bus glue.
@@ -393,10 +401,29 @@ extern int usb_hcd_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id);
extern void usb_hcd_pci_remove(struct pci_dev *dev);
extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
+extern void usb_hcd_free_msi_msix(struct usb_hcd *hcd);
+extern void usb_hcd_msix_sync_irqs(struct usb_hcd *hcd);
+extern int usb_hcd_request_msi_msix_irqs(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags);
+extern int usb_hcd_register_msi_msix_irqs(struct usb_hcd *hcd);
#ifdef CONFIG_PM_SLEEP
extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
#endif
+
+#else
+void usb_hcd_free_msi_msix(struct usb_hcd *hcd)
+{
+}
+void usb_hcd_msix_sync_irqs(struct usb_hcd *hcd)
+{
+}
+int usb_hcd_request_msi_msix_irqs(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags)
+{
+ return 1;
+}
+
#endif /* CONFIG_PCI */
/* pci-ish (pdev null is ok) buffer alloc/mapping support */
--
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