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Message-ID: <20211207205750.GA76930@bhelgaas>
Date: Tue, 7 Dec 2021 14:57:50 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, Marc Zygnier <maz@...nel.org>,
Alex Williamson <alex.williamson@...hat.com>,
Kevin Tian <kevin.tian@...el.com>,
Jason Gunthorpe <jgg@...dia.com>,
Megha Dey <megha.dey@...el.com>,
Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
Cedric Le Goater <clg@...d.org>,
Juergen Gross <jgross@...e.com>,
Michael Ellerman <mpe@...erman.id.au>,
Paul Mackerras <paulus@...ba.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
linux-mips@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
sparclinux@...r.kernel.org, x86@...nel.org,
xen-devel@...ts.xenproject.org, ath11k@...ts.infradead.org,
Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
Christian Borntraeger <borntraeger@...ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: [patch V2 15/23] PCI/MSI: Move code into a separate directory
On Mon, Dec 06, 2021 at 11:27:47PM +0100, Thomas Gleixner wrote:
> msi.c is getting larger and really could do with a splitup. Move it into
> it's own directory to prepare for that.
s/it's/its/
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Tested-by: Juergen Gross <jgross@...e.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
> Documentation/driver-api/pci/pci.rst | 2
> drivers/pci/Makefile | 3
> drivers/pci/msi.c | 1532 -----------------------------------
> drivers/pci/msi/Makefile | 4
> drivers/pci/msi/msi.c | 1532 +++++++++++++++++++++++++++++++++++
> 5 files changed, 1539 insertions(+), 1534 deletions(-)
>
> --- a/Documentation/driver-api/pci/pci.rst
> +++ b/Documentation/driver-api/pci/pci.rst
> @@ -13,7 +13,7 @@ PCI Support Library
> .. kernel-doc:: drivers/pci/search.c
> :export:
>
> -.. kernel-doc:: drivers/pci/msi.c
> +.. kernel-doc:: drivers/pci/msi/msi.c
> :export:
>
> .. kernel-doc:: drivers/pci/bus.c
> --- a/drivers/pci/Makefile
> +++ b/drivers/pci/Makefile
> @@ -5,8 +5,9 @@
> obj-$(CONFIG_PCI) += access.o bus.o probe.o host-bridge.o \
> remove.o pci.o pci-driver.o search.o \
> pci-sysfs.o rom.o setup-res.o irq.o vpd.o \
> - setup-bus.o vc.o mmap.o setup-irq.o msi.o
> + setup-bus.o vc.o mmap.o setup-irq.o
>
> +obj-$(CONFIG_PCI) += msi/
> obj-$(CONFIG_PCI) += pcie/
>
> ifdef CONFIG_PCI
> --- a/drivers/pci/msi.c
> +++ /dev/null
> @@ -1,1532 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * PCI Message Signaled Interrupt (MSI)
> - *
> - * Copyright (C) 2003-2004 Intel
> - * Copyright (C) Tom Long Nguyen (tom.l.nguyen@...el.com)
> - * Copyright (C) 2016 Christoph Hellwig.
> - */
> -
> -#include <linux/acpi_iort.h>
> -#include <linux/err.h>
> -#include <linux/export.h>
> -#include <linux/irq.h>
> -#include <linux/irqdomain.h>
> -#include <linux/msi.h>
> -#include <linux/of_irq.h>
> -#include <linux/pci.h>
> -
> -#include "pci.h"
> -
> -#ifdef CONFIG_PCI_MSI
> -
> -static int pci_msi_enable = 1;
> -int pci_msi_ignore_mask;
> -
> -#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
> -
> -#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> -static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> -{
> - struct irq_domain *domain;
> -
> - domain = dev_get_msi_domain(&dev->dev);
> - if (domain && irq_domain_is_hierarchy(domain))
> - return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
> -
> - return arch_setup_msi_irqs(dev, nvec, type);
> -}
> -
> -static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
> -{
> - struct irq_domain *domain;
> -
> - domain = dev_get_msi_domain(&dev->dev);
> - if (domain && irq_domain_is_hierarchy(domain))
> - msi_domain_free_irqs(domain, &dev->dev);
> - else
> - arch_teardown_msi_irqs(dev);
> -}
> -#else
> -#define pci_msi_setup_msi_irqs arch_setup_msi_irqs
> -#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
> -#endif
> -
> -#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
> -/* Arch hooks */
> -int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
> -{
> - return -EINVAL;
> -}
> -
> -void __weak arch_teardown_msi_irq(unsigned int irq)
> -{
> -}
> -
> -int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> -{
> - struct msi_desc *entry;
> - int ret;
> -
> - /*
> - * If an architecture wants to support multiple MSI, it needs to
> - * override arch_setup_msi_irqs()
> - */
> - if (type == PCI_CAP_ID_MSI && nvec > 1)
> - return 1;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - ret = arch_setup_msi_irq(dev, entry);
> - if (ret < 0)
> - return ret;
> - if (ret > 0)
> - return -ENOSPC;
> - }
> -
> - return 0;
> -}
> -
> -void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
> -{
> - int i;
> - struct msi_desc *entry;
> -
> - for_each_pci_msi_entry(entry, dev)
> - if (entry->irq)
> - for (i = 0; i < entry->nvec_used; i++)
> - arch_teardown_msi_irq(entry->irq + i);
> -}
> -#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
> -
> -/*
> - * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
> - * mask all MSI interrupts by clearing the MSI enable bit does not work
> - * reliably as devices without an INTx disable bit will then generate a
> - * level IRQ which will never be cleared.
> - */
> -static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
> -{
> - /* Don't shift by >= width of type */
> - if (desc->pci.msi_attrib.multi_cap >= 5)
> - return 0xffffffff;
> - return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
> -}
> -
> -static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
> -{
> - raw_spinlock_t *lock = &desc->dev->msi_lock;
> - unsigned long flags;
> -
> - if (!desc->pci.msi_attrib.can_mask)
> - return;
> -
> - raw_spin_lock_irqsave(lock, flags);
> - desc->pci.msi_mask &= ~clear;
> - desc->pci.msi_mask |= set;
> - pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->pci.mask_pos,
> - desc->pci.msi_mask);
> - raw_spin_unlock_irqrestore(lock, flags);
> -}
> -
> -static inline void pci_msi_mask(struct msi_desc *desc, u32 mask)
> -{
> - pci_msi_update_mask(desc, 0, mask);
> -}
> -
> -static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
> -{
> - pci_msi_update_mask(desc, mask, 0);
> -}
> -
> -static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
> -{
> - return desc->pci.mask_base + desc->pci.msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
> -}
> -
> -/*
> - * This internal function does not flush PCI writes to the device. All
> - * users must ensure that they read from the device before either assuming
> - * that the device state is up to date, or returning out of this file.
> - * It does not affect the msi_desc::msix_ctrl cache either. Use with care!
> - */
> -static void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl)
> -{
> - void __iomem *desc_addr = pci_msix_desc_addr(desc);
> -
> - if (desc->pci.msi_attrib.can_mask)
> - writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
> -}
> -
> -static inline void pci_msix_mask(struct msi_desc *desc)
> -{
> - desc->pci.msix_ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
> - pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
> - /* Flush write to device */
> - readl(desc->pci.mask_base);
> -}
> -
> -static inline void pci_msix_unmask(struct msi_desc *desc)
> -{
> - desc->pci.msix_ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
> - pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
> -}
> -
> -static void __pci_msi_mask_desc(struct msi_desc *desc, u32 mask)
> -{
> - if (desc->pci.msi_attrib.is_msix)
> - pci_msix_mask(desc);
> - else
> - pci_msi_mask(desc, mask);
> -}
> -
> -static void __pci_msi_unmask_desc(struct msi_desc *desc, u32 mask)
> -{
> - if (desc->pci.msi_attrib.is_msix)
> - pci_msix_unmask(desc);
> - else
> - pci_msi_unmask(desc, mask);
> -}
> -
> -/**
> - * pci_msi_mask_irq - Generic IRQ chip callback to mask PCI/MSI interrupts
> - * @data: pointer to irqdata associated to that interrupt
> - */
> -void pci_msi_mask_irq(struct irq_data *data)
> -{
> - struct msi_desc *desc = irq_data_get_msi_desc(data);
> -
> - __pci_msi_mask_desc(desc, BIT(data->irq - desc->irq));
> -}
> -EXPORT_SYMBOL_GPL(pci_msi_mask_irq);
> -
> -/**
> - * pci_msi_unmask_irq - Generic IRQ chip callback to unmask PCI/MSI interrupts
> - * @data: pointer to irqdata associated to that interrupt
> - */
> -void pci_msi_unmask_irq(struct irq_data *data)
> -{
> - struct msi_desc *desc = irq_data_get_msi_desc(data);
> -
> - __pci_msi_unmask_desc(desc, BIT(data->irq - desc->irq));
> -}
> -EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);
> -
> -void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> -{
> - struct pci_dev *dev = msi_desc_to_pci_dev(entry);
> -
> - BUG_ON(dev->current_state != PCI_D0);
> -
> - if (entry->pci.msi_attrib.is_msix) {
> - void __iomem *base = pci_msix_desc_addr(entry);
> -
> - if (WARN_ON_ONCE(entry->pci.msi_attrib.is_virtual))
> - return;
> -
> - msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
> - msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
> - msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
> - } else {
> - int pos = dev->msi_cap;
> - u16 data;
> -
> - pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
> - &msg->address_lo);
> - if (entry->pci.msi_attrib.is_64) {
> - pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
> - &msg->address_hi);
> - pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data);
> - } else {
> - msg->address_hi = 0;
> - pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
> - }
> - msg->data = data;
> - }
> -}
> -
> -void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> -{
> - struct pci_dev *dev = msi_desc_to_pci_dev(entry);
> -
> - if (dev->current_state != PCI_D0 || pci_dev_is_disconnected(dev)) {
> - /* Don't touch the hardware now */
> - } else if (entry->pci.msi_attrib.is_msix) {
> - void __iomem *base = pci_msix_desc_addr(entry);
> - u32 ctrl = entry->pci.msix_ctrl;
> - bool unmasked = !(ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
> -
> - if (entry->pci.msi_attrib.is_virtual)
> - goto skip;
> -
> - /*
> - * The specification mandates that the entry is masked
> - * when the message is modified:
> - *
> - * "If software changes the Address or Data value of an
> - * entry while the entry is unmasked, the result is
> - * undefined."
> - */
> - if (unmasked)
> - pci_msix_write_vector_ctrl(entry, ctrl | PCI_MSIX_ENTRY_CTRL_MASKBIT);
> -
> - writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
> - writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
> - writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
> -
> - if (unmasked)
> - pci_msix_write_vector_ctrl(entry, ctrl);
> -
> - /* Ensure that the writes are visible in the device */
> - readl(base + PCI_MSIX_ENTRY_DATA);
> - } else {
> - int pos = dev->msi_cap;
> - u16 msgctl;
> -
> - pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
> - msgctl &= ~PCI_MSI_FLAGS_QSIZE;
> - msgctl |= entry->pci.msi_attrib.multiple << 4;
> - pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
> -
> - pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
> - msg->address_lo);
> - if (entry->pci.msi_attrib.is_64) {
> - pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
> - msg->address_hi);
> - pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
> - msg->data);
> - } else {
> - pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
> - msg->data);
> - }
> - /* Ensure that the writes are visible in the device */
> - pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
> - }
> -
> -skip:
> - entry->msg = *msg;
> -
> - if (entry->write_msi_msg)
> - entry->write_msi_msg(entry, entry->write_msi_msg_data);
> -
> -}
> -
> -void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
> -{
> - struct msi_desc *entry = irq_get_msi_desc(irq);
> -
> - __pci_write_msi_msg(entry, msg);
> -}
> -EXPORT_SYMBOL_GPL(pci_write_msi_msg);
> -
> -static void free_msi_irqs(struct pci_dev *dev)
> -{
> - struct list_head *msi_list = dev_to_msi_list(&dev->dev);
> - struct msi_desc *entry, *tmp;
> - int i;
> -
> - for_each_pci_msi_entry(entry, dev)
> - if (entry->irq)
> - for (i = 0; i < entry->nvec_used; i++)
> - BUG_ON(irq_has_action(entry->irq + i));
> -
> - if (dev->msi_irq_groups) {
> - msi_destroy_sysfs(&dev->dev, dev->msi_irq_groups);
> - dev->msi_irq_groups = NULL;
> - }
> -
> - pci_msi_teardown_msi_irqs(dev);
> -
> - list_for_each_entry_safe(entry, tmp, msi_list, list) {
> - if (entry->pci.msi_attrib.is_msix) {
> - if (list_is_last(&entry->list, msi_list))
> - iounmap(entry->pci.mask_base);
> - }
> -
> - list_del(&entry->list);
> - free_msi_entry(entry);
> - }
> -}
> -
> -static void pci_intx_for_msi(struct pci_dev *dev, int enable)
> -{
> - if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
> - pci_intx(dev, enable);
> -}
> -
> -static void pci_msi_set_enable(struct pci_dev *dev, int enable)
> -{
> - u16 control;
> -
> - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> - control &= ~PCI_MSI_FLAGS_ENABLE;
> - if (enable)
> - control |= PCI_MSI_FLAGS_ENABLE;
> - pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
> -}
> -
> -/*
> - * Architecture override returns true when the PCI MSI message should be
> - * written by the generic restore function.
> - */
> -bool __weak arch_restore_msi_irqs(struct pci_dev *dev)
> -{
> - return true;
> -}
> -
> -static void __pci_restore_msi_state(struct pci_dev *dev)
> -{
> - struct msi_desc *entry;
> - u16 control;
> -
> - if (!dev->msi_enabled)
> - return;
> -
> - entry = irq_get_msi_desc(dev->irq);
> -
> - pci_intx_for_msi(dev, 0);
> - pci_msi_set_enable(dev, 0);
> - if (arch_restore_msi_irqs(dev))
> - __pci_write_msi_msg(entry, &entry->msg);
> -
> - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> - pci_msi_update_mask(entry, 0, 0);
> - control &= ~PCI_MSI_FLAGS_QSIZE;
> - control |= (entry->pci.msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
> - pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
> -}
> -
> -static void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
> -{
> - u16 ctrl;
> -
> - pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
> - ctrl &= ~clear;
> - ctrl |= set;
> - pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
> -}
> -
> -static void __pci_restore_msix_state(struct pci_dev *dev)
> -{
> - struct msi_desc *entry;
> - bool write_msg;
> -
> - if (!dev->msix_enabled)
> - return;
> - BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
> -
> - /* route the table */
> - pci_intx_for_msi(dev, 0);
> - pci_msix_clear_and_set_ctrl(dev, 0,
> - PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
> -
> - write_msg = arch_restore_msi_irqs(dev);
> -
> - for_each_pci_msi_entry(entry, dev) {
> - if (write_msg)
> - __pci_write_msi_msg(entry, &entry->msg);
> - pci_msix_write_vector_ctrl(entry, entry->pci.msix_ctrl);
> - }
> -
> - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
> -}
> -
> -void pci_restore_msi_state(struct pci_dev *dev)
> -{
> - __pci_restore_msi_state(dev);
> - __pci_restore_msix_state(dev);
> -}
> -EXPORT_SYMBOL_GPL(pci_restore_msi_state);
> -
> -static struct msi_desc *
> -msi_setup_entry(struct pci_dev *dev, int nvec, struct irq_affinity *affd)
> -{
> - struct irq_affinity_desc *masks = NULL;
> - struct msi_desc *entry;
> - u16 control;
> -
> - if (affd)
> - masks = irq_create_affinity_masks(nvec, affd);
> -
> - /* MSI Entry Initialization */
> - entry = alloc_msi_entry(&dev->dev, nvec, masks);
> - if (!entry)
> - goto out;
> -
> - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> - /* Lies, damned lies, and MSIs */
> - if (dev->dev_flags & PCI_DEV_FLAGS_HAS_MSI_MASKING)
> - control |= PCI_MSI_FLAGS_MASKBIT;
> -
> - entry->pci.msi_attrib.is_msix = 0;
> - entry->pci.msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
> - entry->pci.msi_attrib.is_virtual = 0;
> - entry->pci.msi_attrib.entry_nr = 0;
> - entry->pci.msi_attrib.can_mask = !pci_msi_ignore_mask &&
> - !!(control & PCI_MSI_FLAGS_MASKBIT);
> - entry->pci.msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
> - entry->pci.msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
> - entry->pci.msi_attrib.multiple = ilog2(__roundup_pow_of_two(nvec));
> -
> - if (control & PCI_MSI_FLAGS_64BIT)
> - entry->pci.mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
> - else
> - entry->pci.mask_pos = dev->msi_cap + PCI_MSI_MASK_32;
> -
> - /* Save the initial mask status */
> - if (entry->pci.msi_attrib.can_mask)
> - pci_read_config_dword(dev, entry->pci.mask_pos, &entry->pci.msi_mask);
> -
> -out:
> - kfree(masks);
> - return entry;
> -}
> -
> -static int msi_verify_entries(struct pci_dev *dev)
> -{
> - struct msi_desc *entry;
> -
> - if (!dev->no_64bit_msi)
> - return 0;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - if (entry->msg.address_hi) {
> - pci_err(dev, "arch assigned 64-bit MSI address %#x%08x but device only supports 32 bits\n",
> - entry->msg.address_hi, entry->msg.address_lo);
> - return -EIO;
> - }
> - }
> - return 0;
> -}
> -
> -/**
> - * msi_capability_init - configure device's MSI capability structure
> - * @dev: pointer to the pci_dev data structure of MSI device function
> - * @nvec: number of interrupts to allocate
> - * @affd: description of automatic IRQ affinity assignments (may be %NULL)
> - *
> - * Setup the MSI capability structure of the device with the requested
> - * number of interrupts. A return value of zero indicates the successful
> - * setup of an entry with the new MSI IRQ. A negative return value indicates
> - * an error, and a positive return value indicates the number of interrupts
> - * which could have been allocated.
> - */
> -static int msi_capability_init(struct pci_dev *dev, int nvec,
> - struct irq_affinity *affd)
> -{
> - const struct attribute_group **groups;
> - struct msi_desc *entry;
> - int ret;
> -
> - pci_msi_set_enable(dev, 0); /* Disable MSI during set up */
> -
> - entry = msi_setup_entry(dev, nvec, affd);
> - if (!entry)
> - return -ENOMEM;
> -
> - /* All MSIs are unmasked by default; mask them all */
> - pci_msi_mask(entry, msi_multi_mask(entry));
> -
> - list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
> -
> - /* Configure MSI capability structure */
> - ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
> - if (ret)
> - goto err;
> -
> - ret = msi_verify_entries(dev);
> - if (ret)
> - goto err;
> -
> - groups = msi_populate_sysfs(&dev->dev);
> - if (IS_ERR(groups)) {
> - ret = PTR_ERR(groups);
> - goto err;
> - }
> -
> - dev->msi_irq_groups = groups;
> -
> - /* Set MSI enabled bits */
> - pci_intx_for_msi(dev, 0);
> - pci_msi_set_enable(dev, 1);
> - dev->msi_enabled = 1;
> -
> - pcibios_free_irq(dev);
> - dev->irq = entry->irq;
> - return 0;
> -
> -err:
> - pci_msi_unmask(entry, msi_multi_mask(entry));
> - free_msi_irqs(dev);
> - return ret;
> -}
> -
> -static void __iomem *msix_map_region(struct pci_dev *dev,
> - unsigned int nr_entries)
> -{
> - resource_size_t phys_addr;
> - u32 table_offset;
> - unsigned long flags;
> - u8 bir;
> -
> - pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE,
> - &table_offset);
> - bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
> - flags = pci_resource_flags(dev, bir);
> - if (!flags || (flags & IORESOURCE_UNSET))
> - return NULL;
> -
> - table_offset &= PCI_MSIX_TABLE_OFFSET;
> - phys_addr = pci_resource_start(dev, bir) + table_offset;
> -
> - return ioremap(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
> -}
> -
> -static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
> - struct msix_entry *entries, int nvec,
> - struct irq_affinity *affd)
> -{
> - struct irq_affinity_desc *curmsk, *masks = NULL;
> - struct msi_desc *entry;
> - void __iomem *addr;
> - int ret, i;
> - int vec_count = pci_msix_vec_count(dev);
> -
> - if (affd)
> - masks = irq_create_affinity_masks(nvec, affd);
> -
> - for (i = 0, curmsk = masks; i < nvec; i++) {
> - entry = alloc_msi_entry(&dev->dev, 1, curmsk);
> - if (!entry) {
> - if (!i)
> - iounmap(base);
> - else
> - free_msi_irqs(dev);
> - /* No enough memory. Don't try again */
> - ret = -ENOMEM;
> - goto out;
> - }
> -
> - entry->pci.msi_attrib.is_msix = 1;
> - entry->pci.msi_attrib.is_64 = 1;
> -
> - if (entries)
> - entry->pci.msi_attrib.entry_nr = entries[i].entry;
> - else
> - entry->pci.msi_attrib.entry_nr = i;
> -
> - entry->pci.msi_attrib.is_virtual =
> - entry->pci.msi_attrib.entry_nr >= vec_count;
> -
> - entry->pci.msi_attrib.can_mask = !pci_msi_ignore_mask &&
> - !entry->pci.msi_attrib.is_virtual;
> -
> - entry->pci.msi_attrib.default_irq = dev->irq;
> - entry->pci.mask_base = base;
> -
> - if (entry->pci.msi_attrib.can_mask) {
> - addr = pci_msix_desc_addr(entry);
> - entry->pci.msix_ctrl = readl(addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
> - }
> -
> - list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
> - if (masks)
> - curmsk++;
> - }
> - ret = 0;
> -out:
> - kfree(masks);
> - return ret;
> -}
> -
> -static void msix_update_entries(struct pci_dev *dev, struct msix_entry *entries)
> -{
> - struct msi_desc *entry;
> -
> - if (entries) {
> - for_each_pci_msi_entry(entry, dev) {
> - entries->vector = entry->irq;
> - entries++;
> - }
> - }
> -}
> -
> -static void msix_mask_all(void __iomem *base, int tsize)
> -{
> - u32 ctrl = PCI_MSIX_ENTRY_CTRL_MASKBIT;
> - int i;
> -
> - if (pci_msi_ignore_mask)
> - return;
> -
> - for (i = 0; i < tsize; i++, base += PCI_MSIX_ENTRY_SIZE)
> - writel(ctrl, base + PCI_MSIX_ENTRY_VECTOR_CTRL);
> -}
> -
> -/**
> - * msix_capability_init - configure device's MSI-X capability
> - * @dev: pointer to the pci_dev data structure of MSI-X device function
> - * @entries: pointer to an array of struct msix_entry entries
> - * @nvec: number of @entries
> - * @affd: Optional pointer to enable automatic affinity assignment
> - *
> - * Setup the MSI-X capability structure of device function with a
> - * single MSI-X IRQ. A return of zero indicates the successful setup of
> - * requested MSI-X entries with allocated IRQs or non-zero for otherwise.
> - **/
> -static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
> - int nvec, struct irq_affinity *affd)
> -{
> - const struct attribute_group **groups;
> - void __iomem *base;
> - int ret, tsize;
> - u16 control;
> -
> - /*
> - * Some devices require MSI-X to be enabled before the MSI-X
> - * registers can be accessed. Mask all the vectors to prevent
> - * interrupts coming in before they're fully set up.
> - */
> - pci_msix_clear_and_set_ctrl(dev, 0, PCI_MSIX_FLAGS_MASKALL |
> - PCI_MSIX_FLAGS_ENABLE);
> -
> - pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
> - /* Request & Map MSI-X table region */
> - tsize = msix_table_size(control);
> - base = msix_map_region(dev, tsize);
> - if (!base) {
> - ret = -ENOMEM;
> - goto out_disable;
> - }
> -
> - /* Ensure that all table entries are masked. */
> - msix_mask_all(base, tsize);
> -
> - ret = msix_setup_entries(dev, base, entries, nvec, affd);
> - if (ret)
> - goto out_disable;
> -
> - ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
> - if (ret)
> - goto out_avail;
> -
> - /* Check if all MSI entries honor device restrictions */
> - ret = msi_verify_entries(dev);
> - if (ret)
> - goto out_free;
> -
> - msix_update_entries(dev, entries);
> -
> - groups = msi_populate_sysfs(&dev->dev);
> - if (IS_ERR(groups)) {
> - ret = PTR_ERR(groups);
> - goto out_free;
> - }
> -
> - dev->msi_irq_groups = groups;
> -
> - /* Set MSI-X enabled bits and unmask the function */
> - pci_intx_for_msi(dev, 0);
> - dev->msix_enabled = 1;
> - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
> -
> - pcibios_free_irq(dev);
> - return 0;
> -
> -out_avail:
> - if (ret < 0) {
> - /*
> - * If we had some success, report the number of IRQs
> - * we succeeded in setting up.
> - */
> - struct msi_desc *entry;
> - int avail = 0;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - if (entry->irq != 0)
> - avail++;
> - }
> - if (avail != 0)
> - ret = avail;
> - }
> -
> -out_free:
> - free_msi_irqs(dev);
> -
> -out_disable:
> - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> -
> - return ret;
> -}
> -
> -/**
> - * pci_msi_supported - check whether MSI may be enabled on a device
> - * @dev: pointer to the pci_dev data structure of MSI device function
> - * @nvec: how many MSIs have been requested?
> - *
> - * Look at global flags, the device itself, and its parent buses
> - * to determine if MSI/-X are supported for the device. If MSI/-X is
> - * supported return 1, else return 0.
> - **/
> -static int pci_msi_supported(struct pci_dev *dev, int nvec)
> -{
> - struct pci_bus *bus;
> -
> - /* MSI must be globally enabled and supported by the device */
> - if (!pci_msi_enable)
> - return 0;
> -
> - if (!dev || dev->no_msi)
> - return 0;
> -
> - /*
> - * You can't ask to have 0 or less MSIs configured.
> - * a) it's stupid ..
> - * b) the list manipulation code assumes nvec >= 1.
> - */
> - if (nvec < 1)
> - return 0;
> -
> - /*
> - * Any bridge which does NOT route MSI transactions from its
> - * secondary bus to its primary bus must set NO_MSI flag on
> - * the secondary pci_bus.
> - *
> - * The NO_MSI flag can either be set directly by:
> - * - arch-specific PCI host bus controller drivers (deprecated)
> - * - quirks for specific PCI bridges
> - *
> - * or indirectly by platform-specific PCI host bridge drivers by
> - * advertising the 'msi_domain' property, which results in
> - * the NO_MSI flag when no MSI domain is found for this bridge
> - * at probe time.
> - */
> - for (bus = dev->bus; bus; bus = bus->parent)
> - if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
> - return 0;
> -
> - return 1;
> -}
> -
> -/**
> - * pci_msi_vec_count - Return the number of MSI vectors a device can send
> - * @dev: device to report about
> - *
> - * This function returns the number of MSI vectors a device requested via
> - * Multiple Message Capable register. It returns a negative errno if the
> - * device is not capable sending MSI interrupts. Otherwise, the call succeeds
> - * and returns a power of two, up to a maximum of 2^5 (32), according to the
> - * MSI specification.
> - **/
> -int pci_msi_vec_count(struct pci_dev *dev)
> -{
> - int ret;
> - u16 msgctl;
> -
> - if (!dev->msi_cap)
> - return -EINVAL;
> -
> - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
> - ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(pci_msi_vec_count);
> -
> -static void pci_msi_shutdown(struct pci_dev *dev)
> -{
> - struct msi_desc *desc;
> -
> - if (!pci_msi_enable || !dev || !dev->msi_enabled)
> - return;
> -
> - BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
> - desc = first_pci_msi_entry(dev);
> -
> - pci_msi_set_enable(dev, 0);
> - pci_intx_for_msi(dev, 1);
> - dev->msi_enabled = 0;
> -
> - /* Return the device with MSI unmasked as initial states */
> - pci_msi_unmask(desc, msi_multi_mask(desc));
> -
> - /* Restore dev->irq to its default pin-assertion IRQ */
> - dev->irq = desc->pci.msi_attrib.default_irq;
> - pcibios_alloc_irq(dev);
> -}
> -
> -void pci_disable_msi(struct pci_dev *dev)
> -{
> - if (!pci_msi_enable || !dev || !dev->msi_enabled)
> - return;
> -
> - pci_msi_shutdown(dev);
> - free_msi_irqs(dev);
> -}
> -EXPORT_SYMBOL(pci_disable_msi);
> -
> -/**
> - * pci_msix_vec_count - return the number of device's MSI-X table entries
> - * @dev: pointer to the pci_dev data structure of MSI-X device function
> - * This function returns the number of device's MSI-X table entries and
> - * therefore the number of MSI-X vectors device is capable of sending.
> - * It returns a negative errno if the device is not capable of sending MSI-X
> - * interrupts.
> - **/
> -int pci_msix_vec_count(struct pci_dev *dev)
> -{
> - u16 control;
> -
> - if (!dev->msix_cap)
> - return -EINVAL;
> -
> - pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
> - return msix_table_size(control);
> -}
> -EXPORT_SYMBOL(pci_msix_vec_count);
> -
> -static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
> - int nvec, struct irq_affinity *affd, int flags)
> -{
> - int nr_entries;
> - int i, j;
> -
> - if (!pci_msi_supported(dev, nvec) || dev->current_state != PCI_D0)
> - return -EINVAL;
> -
> - nr_entries = pci_msix_vec_count(dev);
> - if (nr_entries < 0)
> - return nr_entries;
> - if (nvec > nr_entries && !(flags & PCI_IRQ_VIRTUAL))
> - return nr_entries;
> -
> - if (entries) {
> - /* Check for any invalid entries */
> - for (i = 0; i < nvec; i++) {
> - if (entries[i].entry >= nr_entries)
> - return -EINVAL; /* invalid entry */
> - for (j = i + 1; j < nvec; j++) {
> - if (entries[i].entry == entries[j].entry)
> - return -EINVAL; /* duplicate entry */
> - }
> - }
> - }
> -
> - /* Check whether driver already requested for MSI IRQ */
> - if (dev->msi_enabled) {
> - pci_info(dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
> - return -EINVAL;
> - }
> - return msix_capability_init(dev, entries, nvec, affd);
> -}
> -
> -static void pci_msix_shutdown(struct pci_dev *dev)
> -{
> - struct msi_desc *entry;
> -
> - if (!pci_msi_enable || !dev || !dev->msix_enabled)
> - return;
> -
> - if (pci_dev_is_disconnected(dev)) {
> - dev->msix_enabled = 0;
> - return;
> - }
> -
> - /* Return the device with MSI-X masked as initial states */
> - for_each_pci_msi_entry(entry, dev)
> - pci_msix_mask(entry);
> -
> - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> - pci_intx_for_msi(dev, 1);
> - dev->msix_enabled = 0;
> - pcibios_alloc_irq(dev);
> -}
> -
> -void pci_disable_msix(struct pci_dev *dev)
> -{
> - if (!pci_msi_enable || !dev || !dev->msix_enabled)
> - return;
> -
> - pci_msix_shutdown(dev);
> - free_msi_irqs(dev);
> -}
> -EXPORT_SYMBOL(pci_disable_msix);
> -
> -void pci_no_msi(void)
> -{
> - pci_msi_enable = 0;
> -}
> -
> -/**
> - * pci_msi_enabled - is MSI enabled?
> - *
> - * Returns true if MSI has not been disabled by the command-line option
> - * pci=nomsi.
> - **/
> -int pci_msi_enabled(void)
> -{
> - return pci_msi_enable;
> -}
> -EXPORT_SYMBOL(pci_msi_enabled);
> -
> -static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
> - struct irq_affinity *affd)
> -{
> - int nvec;
> - int rc;
> -
> - if (!pci_msi_supported(dev, minvec) || dev->current_state != PCI_D0)
> - return -EINVAL;
> -
> - /* Check whether driver already requested MSI-X IRQs */
> - if (dev->msix_enabled) {
> - pci_info(dev, "can't enable MSI (MSI-X already enabled)\n");
> - return -EINVAL;
> - }
> -
> - if (maxvec < minvec)
> - return -ERANGE;
> -
> - if (WARN_ON_ONCE(dev->msi_enabled))
> - return -EINVAL;
> -
> - nvec = pci_msi_vec_count(dev);
> - if (nvec < 0)
> - return nvec;
> - if (nvec < minvec)
> - return -ENOSPC;
> -
> - if (nvec > maxvec)
> - nvec = maxvec;
> -
> - for (;;) {
> - if (affd) {
> - nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
> - if (nvec < minvec)
> - return -ENOSPC;
> - }
> -
> - rc = msi_capability_init(dev, nvec, affd);
> - if (rc == 0)
> - return nvec;
> -
> - if (rc < 0)
> - return rc;
> - if (rc < minvec)
> - return -ENOSPC;
> -
> - nvec = rc;
> - }
> -}
> -
> -/* deprecated, don't use */
> -int pci_enable_msi(struct pci_dev *dev)
> -{
> - int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
> - if (rc < 0)
> - return rc;
> - return 0;
> -}
> -EXPORT_SYMBOL(pci_enable_msi);
> -
> -static int __pci_enable_msix_range(struct pci_dev *dev,
> - struct msix_entry *entries, int minvec,
> - int maxvec, struct irq_affinity *affd,
> - int flags)
> -{
> - int rc, nvec = maxvec;
> -
> - if (maxvec < minvec)
> - return -ERANGE;
> -
> - if (WARN_ON_ONCE(dev->msix_enabled))
> - return -EINVAL;
> -
> - for (;;) {
> - if (affd) {
> - nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
> - if (nvec < minvec)
> - return -ENOSPC;
> - }
> -
> - rc = __pci_enable_msix(dev, entries, nvec, affd, flags);
> - if (rc == 0)
> - return nvec;
> -
> - if (rc < 0)
> - return rc;
> - if (rc < minvec)
> - return -ENOSPC;
> -
> - nvec = rc;
> - }
> -}
> -
> -/**
> - * pci_enable_msix_range - configure device's MSI-X capability structure
> - * @dev: pointer to the pci_dev data structure of MSI-X device function
> - * @entries: pointer to an array of MSI-X entries
> - * @minvec: minimum number of MSI-X IRQs requested
> - * @maxvec: maximum number of MSI-X IRQs requested
> - *
> - * Setup the MSI-X capability structure of device function with a maximum
> - * possible number of interrupts in the range between @minvec and @maxvec
> - * upon its software driver call to request for MSI-X mode enabled on its
> - * hardware device function. It returns a negative errno if an error occurs.
> - * If it succeeds, it returns the actual number of interrupts allocated and
> - * indicates the successful configuration of MSI-X capability structure
> - * with new allocated MSI-X interrupts.
> - **/
> -int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
> - int minvec, int maxvec)
> -{
> - return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
> -}
> -EXPORT_SYMBOL(pci_enable_msix_range);
> -
> -/**
> - * pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
> - * @dev: PCI device to operate on
> - * @min_vecs: minimum number of vectors required (must be >= 1)
> - * @max_vecs: maximum (desired) number of vectors
> - * @flags: flags or quirks for the allocation
> - * @affd: optional description of the affinity requirements
> - *
> - * Allocate up to @max_vecs interrupt vectors for @dev, using MSI-X or MSI
> - * vectors if available, and fall back to a single legacy vector
> - * if neither is available. Return the number of vectors allocated,
> - * (which might be smaller than @max_vecs) if successful, or a negative
> - * error code on error. If less than @min_vecs interrupt vectors are
> - * available for @dev the function will fail with -ENOSPC.
> - *
> - * To get the Linux IRQ number used for a vector that can be passed to
> - * request_irq() use the pci_irq_vector() helper.
> - */
> -int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
> - unsigned int max_vecs, unsigned int flags,
> - struct irq_affinity *affd)
> -{
> - struct irq_affinity msi_default_affd = {0};
> - int nvecs = -ENOSPC;
> -
> - if (flags & PCI_IRQ_AFFINITY) {
> - if (!affd)
> - affd = &msi_default_affd;
> - } else {
> - if (WARN_ON(affd))
> - affd = NULL;
> - }
> -
> - if (flags & PCI_IRQ_MSIX) {
> - nvecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
> - affd, flags);
> - if (nvecs > 0)
> - return nvecs;
> - }
> -
> - if (flags & PCI_IRQ_MSI) {
> - nvecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
> - if (nvecs > 0)
> - return nvecs;
> - }
> -
> - /* use legacy IRQ if allowed */
> - if (flags & PCI_IRQ_LEGACY) {
> - if (min_vecs == 1 && dev->irq) {
> - /*
> - * Invoke the affinity spreading logic to ensure that
> - * the device driver can adjust queue configuration
> - * for the single interrupt case.
> - */
> - if (affd)
> - irq_create_affinity_masks(1, affd);
> - pci_intx(dev, 1);
> - return 1;
> - }
> - }
> -
> - return nvecs;
> -}
> -EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);
> -
> -/**
> - * pci_free_irq_vectors - free previously allocated IRQs for a device
> - * @dev: PCI device to operate on
> - *
> - * Undoes the allocations and enabling in pci_alloc_irq_vectors().
> - */
> -void pci_free_irq_vectors(struct pci_dev *dev)
> -{
> - pci_disable_msix(dev);
> - pci_disable_msi(dev);
> -}
> -EXPORT_SYMBOL(pci_free_irq_vectors);
> -
> -/**
> - * pci_irq_vector - return Linux IRQ number of a device vector
> - * @dev: PCI device to operate on
> - * @nr: Interrupt vector index (0-based)
> - *
> - * @nr has the following meanings depending on the interrupt mode:
> - * MSI-X: The index in the MSI-X vector table
> - * MSI: The index of the enabled MSI vectors
> - * INTx: Must be 0
> - *
> - * Return: The Linux interrupt number or -EINVAl if @nr is out of range.
> - */
> -int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
> -{
> - if (dev->msix_enabled) {
> - struct msi_desc *entry;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - if (entry->pci.msi_attrib.entry_nr == nr)
> - return entry->irq;
> - }
> - WARN_ON_ONCE(1);
> - return -EINVAL;
> - }
> -
> - if (dev->msi_enabled) {
> - struct msi_desc *entry = first_pci_msi_entry(dev);
> -
> - if (WARN_ON_ONCE(nr >= entry->nvec_used))
> - return -EINVAL;
> - } else {
> - if (WARN_ON_ONCE(nr > 0))
> - return -EINVAL;
> - }
> -
> - return dev->irq + nr;
> -}
> -EXPORT_SYMBOL(pci_irq_vector);
> -
> -/**
> - * pci_irq_get_affinity - return the affinity of a particular MSI vector
> - * @dev: PCI device to operate on
> - * @nr: device-relative interrupt vector index (0-based).
> - *
> - * @nr has the following meanings depending on the interrupt mode:
> - * MSI-X: The index in the MSI-X vector table
> - * MSI: The index of the enabled MSI vectors
> - * INTx: Must be 0
> - *
> - * Return: A cpumask pointer or NULL if @nr is out of range
> - */
> -const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
> -{
> - if (dev->msix_enabled) {
> - struct msi_desc *entry;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - if (entry->pci.msi_attrib.entry_nr == nr)
> - return &entry->affinity->mask;
> - }
> - WARN_ON_ONCE(1);
> - return NULL;
> - } else if (dev->msi_enabled) {
> - struct msi_desc *entry = first_pci_msi_entry(dev);
> -
> - if (WARN_ON_ONCE(!entry || !entry->affinity ||
> - nr >= entry->nvec_used))
> - return NULL;
> -
> - return &entry->affinity[nr].mask;
> - } else {
> - return cpu_possible_mask;
> - }
> -}
> -EXPORT_SYMBOL(pci_irq_get_affinity);
> -
> -struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
> -{
> - return to_pci_dev(desc->dev);
> -}
> -EXPORT_SYMBOL(msi_desc_to_pci_dev);
> -
> -#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> -/**
> - * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
> - * @irq_data: Pointer to interrupt data of the MSI interrupt
> - * @msg: Pointer to the message
> - */
> -static void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
> -{
> - struct msi_desc *desc = irq_data_get_msi_desc(irq_data);
> -
> - /*
> - * For MSI-X desc->irq is always equal to irq_data->irq. For
> - * MSI only the first interrupt of MULTI MSI passes the test.
> - */
> - if (desc->irq == irq_data->irq)
> - __pci_write_msi_msg(desc, msg);
> -}
> -
> -/**
> - * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
> - * @desc: Pointer to the MSI descriptor
> - *
> - * The ID number is only used within the irqdomain.
> - */
> -static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
> -{
> - struct pci_dev *dev = msi_desc_to_pci_dev(desc);
> -
> - return (irq_hw_number_t)desc->pci.msi_attrib.entry_nr |
> - pci_dev_id(dev) << 11 |
> - (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
> -}
> -
> -static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
> -{
> - return !desc->pci.msi_attrib.is_msix && desc->nvec_used > 1;
> -}
> -
> -/**
> - * pci_msi_domain_check_cap - Verify that @domain supports the capabilities
> - * for @dev
> - * @domain: The interrupt domain to check
> - * @info: The domain info for verification
> - * @dev: The device to check
> - *
> - * Returns:
> - * 0 if the functionality is supported
> - * 1 if Multi MSI is requested, but the domain does not support it
> - * -ENOTSUPP otherwise
> - */
> -int pci_msi_domain_check_cap(struct irq_domain *domain,
> - struct msi_domain_info *info, struct device *dev)
> -{
> - struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
> -
> - /* Special handling to support __pci_enable_msi_range() */
> - if (pci_msi_desc_is_multi_msi(desc) &&
> - !(info->flags & MSI_FLAG_MULTI_PCI_MSI))
> - return 1;
> - else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
> - return -ENOTSUPP;
> -
> - return 0;
> -}
> -
> -static int pci_msi_domain_handle_error(struct irq_domain *domain,
> - struct msi_desc *desc, int error)
> -{
> - /* Special handling to support __pci_enable_msi_range() */
> - if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
> - return 1;
> -
> - return error;
> -}
> -
> -static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
> - struct msi_desc *desc)
> -{
> - arg->desc = desc;
> - arg->hwirq = pci_msi_domain_calc_hwirq(desc);
> -}
> -
> -static struct msi_domain_ops pci_msi_domain_ops_default = {
> - .set_desc = pci_msi_domain_set_desc,
> - .msi_check = pci_msi_domain_check_cap,
> - .handle_error = pci_msi_domain_handle_error,
> -};
> -
> -static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
> -{
> - struct msi_domain_ops *ops = info->ops;
> -
> - if (ops == NULL) {
> - info->ops = &pci_msi_domain_ops_default;
> - } else {
> - if (ops->set_desc == NULL)
> - ops->set_desc = pci_msi_domain_set_desc;
> - if (ops->msi_check == NULL)
> - ops->msi_check = pci_msi_domain_check_cap;
> - if (ops->handle_error == NULL)
> - ops->handle_error = pci_msi_domain_handle_error;
> - }
> -}
> -
> -static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
> -{
> - struct irq_chip *chip = info->chip;
> -
> - BUG_ON(!chip);
> - if (!chip->irq_write_msi_msg)
> - chip->irq_write_msi_msg = pci_msi_domain_write_msg;
> - if (!chip->irq_mask)
> - chip->irq_mask = pci_msi_mask_irq;
> - if (!chip->irq_unmask)
> - chip->irq_unmask = pci_msi_unmask_irq;
> -}
> -
> -/**
> - * pci_msi_create_irq_domain - Create a MSI interrupt domain
> - * @fwnode: Optional fwnode of the interrupt controller
> - * @info: MSI domain info
> - * @parent: Parent irq domain
> - *
> - * Updates the domain and chip ops and creates a MSI interrupt domain.
> - *
> - * Returns:
> - * A domain pointer or NULL in case of failure.
> - */
> -struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
> - struct msi_domain_info *info,
> - struct irq_domain *parent)
> -{
> - struct irq_domain *domain;
> -
> - if (WARN_ON(info->flags & MSI_FLAG_LEVEL_CAPABLE))
> - info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
> -
> - if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
> - pci_msi_domain_update_dom_ops(info);
> - if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
> - pci_msi_domain_update_chip_ops(info);
> -
> - info->flags |= MSI_FLAG_ACTIVATE_EARLY;
> - if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
> - info->flags |= MSI_FLAG_MUST_REACTIVATE;
> -
> - /* PCI-MSI is oneshot-safe */
> - info->chip->flags |= IRQCHIP_ONESHOT_SAFE;
> -
> - domain = msi_create_irq_domain(fwnode, info, parent);
> - if (!domain)
> - return NULL;
> -
> - irq_domain_update_bus_token(domain, DOMAIN_BUS_PCI_MSI);
> - return domain;
> -}
> -EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
> -
> -/*
> - * Users of the generic MSI infrastructure expect a device to have a single ID,
> - * so with DMA aliases we have to pick the least-worst compromise. Devices with
> - * DMA phantom functions tend to still emit MSIs from the real function number,
> - * so we ignore those and only consider topological aliases where either the
> - * alias device or RID appears on a different bus number. We also make the
> - * reasonable assumption that bridges are walked in an upstream direction (so
> - * the last one seen wins), and the much braver assumption that the most likely
> - * case is that of PCI->PCIe so we should always use the alias RID. This echoes
> - * the logic from intel_irq_remapping's set_msi_sid(), which presumably works
> - * well enough in practice; in the face of the horrible PCIe<->PCI-X conditions
> - * for taking ownership all we can really do is close our eyes and hope...
> - */
> -static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
> -{
> - u32 *pa = data;
> - u8 bus = PCI_BUS_NUM(*pa);
> -
> - if (pdev->bus->number != bus || PCI_BUS_NUM(alias) != bus)
> - *pa = alias;
> -
> - return 0;
> -}
> -
> -/**
> - * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
> - * @domain: The interrupt domain
> - * @pdev: The PCI device.
> - *
> - * The RID for a device is formed from the alias, with a firmware
> - * supplied mapping applied
> - *
> - * Returns: The RID.
> - */
> -u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
> -{
> - struct device_node *of_node;
> - u32 rid = pci_dev_id(pdev);
> -
> - pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> -
> - of_node = irq_domain_get_of_node(domain);
> - rid = of_node ? of_msi_map_id(&pdev->dev, of_node, rid) :
> - iort_msi_map_id(&pdev->dev, rid);
> -
> - return rid;
> -}
> -
> -/**
> - * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
> - * @pdev: The PCI device
> - *
> - * Use the firmware data to find a device-specific MSI domain
> - * (i.e. not one that is set as a default).
> - *
> - * Returns: The corresponding MSI domain or NULL if none has been found.
> - */
> -struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
> -{
> - struct irq_domain *dom;
> - u32 rid = pci_dev_id(pdev);
> -
> - pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> - dom = of_msi_map_get_device_domain(&pdev->dev, rid, DOMAIN_BUS_PCI_MSI);
> - if (!dom)
> - dom = iort_get_device_domain(&pdev->dev, rid,
> - DOMAIN_BUS_PCI_MSI);
> - return dom;
> -}
> -
> -/**
> - * pci_dev_has_special_msi_domain - Check whether the device is handled by
> - * a non-standard PCI-MSI domain
> - * @pdev: The PCI device to check.
> - *
> - * Returns: True if the device irqdomain or the bus irqdomain is
> - * non-standard PCI/MSI.
> - */
> -bool pci_dev_has_special_msi_domain(struct pci_dev *pdev)
> -{
> - struct irq_domain *dom = dev_get_msi_domain(&pdev->dev);
> -
> - if (!dom)
> - dom = dev_get_msi_domain(&pdev->bus->dev);
> -
> - if (!dom)
> - return true;
> -
> - return dom->bus_token != DOMAIN_BUS_PCI_MSI;
> -}
> -
> -#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
> -#endif /* CONFIG_PCI_MSI */
> -
> -void pci_msi_init(struct pci_dev *dev)
> -{
> - u16 ctrl;
> -
> - /*
> - * Disable the MSI hardware to avoid screaming interrupts
> - * during boot. This is the power on reset default so
> - * usually this should be a noop.
> - */
> - dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
> - if (!dev->msi_cap)
> - return;
> -
> - pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
> - if (ctrl & PCI_MSI_FLAGS_ENABLE)
> - pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
> - ctrl & ~PCI_MSI_FLAGS_ENABLE);
> -
> - if (!(ctrl & PCI_MSI_FLAGS_64BIT))
> - dev->no_64bit_msi = 1;
> -}
> -
> -void pci_msix_init(struct pci_dev *dev)
> -{
> - u16 ctrl;
> -
> - dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> - if (!dev->msix_cap)
> - return;
> -
> - pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
> - if (ctrl & PCI_MSIX_FLAGS_ENABLE)
> - pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
> - ctrl & ~PCI_MSIX_FLAGS_ENABLE);
> -}
> --- /dev/null
> +++ b/drivers/pci/msi/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Makefile for the PCI/MSI
> +obj-$(CONFIG_PCI) += msi.o
> --- /dev/null
> +++ b/drivers/pci/msi/msi.c
> @@ -0,0 +1,1532 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCI Message Signaled Interrupt (MSI)
> + *
> + * Copyright (C) 2003-2004 Intel
> + * Copyright (C) Tom Long Nguyen (tom.l.nguyen@...el.com)
> + * Copyright (C) 2016 Christoph Hellwig.
> + */
> +
> +#include <linux/acpi_iort.h>
> +#include <linux/err.h>
> +#include <linux/export.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/msi.h>
> +#include <linux/of_irq.h>
> +#include <linux/pci.h>
> +
> +#include "../pci.h"
> +
> +#ifdef CONFIG_PCI_MSI
> +
> +static int pci_msi_enable = 1;
> +int pci_msi_ignore_mask;
> +
> +#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
> +
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +{
> + struct irq_domain *domain;
> +
> + domain = dev_get_msi_domain(&dev->dev);
> + if (domain && irq_domain_is_hierarchy(domain))
> + return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
> +
> + return arch_setup_msi_irqs(dev, nvec, type);
> +}
> +
> +static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
> +{
> + struct irq_domain *domain;
> +
> + domain = dev_get_msi_domain(&dev->dev);
> + if (domain && irq_domain_is_hierarchy(domain))
> + msi_domain_free_irqs(domain, &dev->dev);
> + else
> + arch_teardown_msi_irqs(dev);
> +}
> +#else
> +#define pci_msi_setup_msi_irqs arch_setup_msi_irqs
> +#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
> +#endif
> +
> +#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
> +/* Arch hooks */
> +int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
> +{
> + return -EINVAL;
> +}
> +
> +void __weak arch_teardown_msi_irq(unsigned int irq)
> +{
> +}
> +
> +int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +{
> + struct msi_desc *entry;
> + int ret;
> +
> + /*
> + * If an architecture wants to support multiple MSI, it needs to
> + * override arch_setup_msi_irqs()
> + */
> + if (type == PCI_CAP_ID_MSI && nvec > 1)
> + return 1;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + ret = arch_setup_msi_irq(dev, entry);
> + if (ret < 0)
> + return ret;
> + if (ret > 0)
> + return -ENOSPC;
> + }
> +
> + return 0;
> +}
> +
> +void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
> +{
> + int i;
> + struct msi_desc *entry;
> +
> + for_each_pci_msi_entry(entry, dev)
> + if (entry->irq)
> + for (i = 0; i < entry->nvec_used; i++)
> + arch_teardown_msi_irq(entry->irq + i);
> +}
> +#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
> +
> +/*
> + * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
> + * mask all MSI interrupts by clearing the MSI enable bit does not work
> + * reliably as devices without an INTx disable bit will then generate a
> + * level IRQ which will never be cleared.
> + */
> +static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
> +{
> + /* Don't shift by >= width of type */
> + if (desc->pci.msi_attrib.multi_cap >= 5)
> + return 0xffffffff;
> + return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
> +}
> +
> +static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
> +{
> + raw_spinlock_t *lock = &desc->dev->msi_lock;
> + unsigned long flags;
> +
> + if (!desc->pci.msi_attrib.can_mask)
> + return;
> +
> + raw_spin_lock_irqsave(lock, flags);
> + desc->pci.msi_mask &= ~clear;
> + desc->pci.msi_mask |= set;
> + pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->pci.mask_pos,
> + desc->pci.msi_mask);
> + raw_spin_unlock_irqrestore(lock, flags);
> +}
> +
> +static inline void pci_msi_mask(struct msi_desc *desc, u32 mask)
> +{
> + pci_msi_update_mask(desc, 0, mask);
> +}
> +
> +static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
> +{
> + pci_msi_update_mask(desc, mask, 0);
> +}
> +
> +static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
> +{
> + return desc->pci.mask_base + desc->pci.msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
> +}
> +
> +/*
> + * This internal function does not flush PCI writes to the device. All
> + * users must ensure that they read from the device before either assuming
> + * that the device state is up to date, or returning out of this file.
> + * It does not affect the msi_desc::msix_ctrl cache either. Use with care!
> + */
> +static void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl)
> +{
> + void __iomem *desc_addr = pci_msix_desc_addr(desc);
> +
> + if (desc->pci.msi_attrib.can_mask)
> + writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
> +}
> +
> +static inline void pci_msix_mask(struct msi_desc *desc)
> +{
> + desc->pci.msix_ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
> + pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
> + /* Flush write to device */
> + readl(desc->pci.mask_base);
> +}
> +
> +static inline void pci_msix_unmask(struct msi_desc *desc)
> +{
> + desc->pci.msix_ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
> + pci_msix_write_vector_ctrl(desc, desc->pci.msix_ctrl);
> +}
> +
> +static void __pci_msi_mask_desc(struct msi_desc *desc, u32 mask)
> +{
> + if (desc->pci.msi_attrib.is_msix)
> + pci_msix_mask(desc);
> + else
> + pci_msi_mask(desc, mask);
> +}
> +
> +static void __pci_msi_unmask_desc(struct msi_desc *desc, u32 mask)
> +{
> + if (desc->pci.msi_attrib.is_msix)
> + pci_msix_unmask(desc);
> + else
> + pci_msi_unmask(desc, mask);
> +}
> +
> +/**
> + * pci_msi_mask_irq - Generic IRQ chip callback to mask PCI/MSI interrupts
> + * @data: pointer to irqdata associated to that interrupt
> + */
> +void pci_msi_mask_irq(struct irq_data *data)
> +{
> + struct msi_desc *desc = irq_data_get_msi_desc(data);
> +
> + __pci_msi_mask_desc(desc, BIT(data->irq - desc->irq));
> +}
> +EXPORT_SYMBOL_GPL(pci_msi_mask_irq);
> +
> +/**
> + * pci_msi_unmask_irq - Generic IRQ chip callback to unmask PCI/MSI interrupts
> + * @data: pointer to irqdata associated to that interrupt
> + */
> +void pci_msi_unmask_irq(struct irq_data *data)
> +{
> + struct msi_desc *desc = irq_data_get_msi_desc(data);
> +
> + __pci_msi_unmask_desc(desc, BIT(data->irq - desc->irq));
> +}
> +EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);
> +
> +void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +{
> + struct pci_dev *dev = msi_desc_to_pci_dev(entry);
> +
> + BUG_ON(dev->current_state != PCI_D0);
> +
> + if (entry->pci.msi_attrib.is_msix) {
> + void __iomem *base = pci_msix_desc_addr(entry);
> +
> + if (WARN_ON_ONCE(entry->pci.msi_attrib.is_virtual))
> + return;
> +
> + msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
> + msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
> + msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
> + } else {
> + int pos = dev->msi_cap;
> + u16 data;
> +
> + pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
> + &msg->address_lo);
> + if (entry->pci.msi_attrib.is_64) {
> + pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
> + &msg->address_hi);
> + pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data);
> + } else {
> + msg->address_hi = 0;
> + pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
> + }
> + msg->data = data;
> + }
> +}
> +
> +void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +{
> + struct pci_dev *dev = msi_desc_to_pci_dev(entry);
> +
> + if (dev->current_state != PCI_D0 || pci_dev_is_disconnected(dev)) {
> + /* Don't touch the hardware now */
> + } else if (entry->pci.msi_attrib.is_msix) {
> + void __iomem *base = pci_msix_desc_addr(entry);
> + u32 ctrl = entry->pci.msix_ctrl;
> + bool unmasked = !(ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
> +
> + if (entry->pci.msi_attrib.is_virtual)
> + goto skip;
> +
> + /*
> + * The specification mandates that the entry is masked
> + * when the message is modified:
> + *
> + * "If software changes the Address or Data value of an
> + * entry while the entry is unmasked, the result is
> + * undefined."
> + */
> + if (unmasked)
> + pci_msix_write_vector_ctrl(entry, ctrl | PCI_MSIX_ENTRY_CTRL_MASKBIT);
> +
> + writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
> + writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
> + writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
> +
> + if (unmasked)
> + pci_msix_write_vector_ctrl(entry, ctrl);
> +
> + /* Ensure that the writes are visible in the device */
> + readl(base + PCI_MSIX_ENTRY_DATA);
> + } else {
> + int pos = dev->msi_cap;
> + u16 msgctl;
> +
> + pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
> + msgctl &= ~PCI_MSI_FLAGS_QSIZE;
> + msgctl |= entry->pci.msi_attrib.multiple << 4;
> + pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
> +
> + pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
> + msg->address_lo);
> + if (entry->pci.msi_attrib.is_64) {
> + pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
> + msg->address_hi);
> + pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
> + msg->data);
> + } else {
> + pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
> + msg->data);
> + }
> + /* Ensure that the writes are visible in the device */
> + pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
> + }
> +
> +skip:
> + entry->msg = *msg;
> +
> + if (entry->write_msi_msg)
> + entry->write_msi_msg(entry, entry->write_msi_msg_data);
> +
> +}
> +
> +void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
> +{
> + struct msi_desc *entry = irq_get_msi_desc(irq);
> +
> + __pci_write_msi_msg(entry, msg);
> +}
> +EXPORT_SYMBOL_GPL(pci_write_msi_msg);
> +
> +static void free_msi_irqs(struct pci_dev *dev)
> +{
> + struct list_head *msi_list = dev_to_msi_list(&dev->dev);
> + struct msi_desc *entry, *tmp;
> + int i;
> +
> + for_each_pci_msi_entry(entry, dev)
> + if (entry->irq)
> + for (i = 0; i < entry->nvec_used; i++)
> + BUG_ON(irq_has_action(entry->irq + i));
> +
> + if (dev->msi_irq_groups) {
> + msi_destroy_sysfs(&dev->dev, dev->msi_irq_groups);
> + dev->msi_irq_groups = NULL;
> + }
> +
> + pci_msi_teardown_msi_irqs(dev);
> +
> + list_for_each_entry_safe(entry, tmp, msi_list, list) {
> + if (entry->pci.msi_attrib.is_msix) {
> + if (list_is_last(&entry->list, msi_list))
> + iounmap(entry->pci.mask_base);
> + }
> +
> + list_del(&entry->list);
> + free_msi_entry(entry);
> + }
> +}
> +
> +static void pci_intx_for_msi(struct pci_dev *dev, int enable)
> +{
> + if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
> + pci_intx(dev, enable);
> +}
> +
> +static void pci_msi_set_enable(struct pci_dev *dev, int enable)
> +{
> + u16 control;
> +
> + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> + control &= ~PCI_MSI_FLAGS_ENABLE;
> + if (enable)
> + control |= PCI_MSI_FLAGS_ENABLE;
> + pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
> +}
> +
> +/*
> + * Architecture override returns true when the PCI MSI message should be
> + * written by the generic restore function.
> + */
> +bool __weak arch_restore_msi_irqs(struct pci_dev *dev)
> +{
> + return true;
> +}
> +
> +static void __pci_restore_msi_state(struct pci_dev *dev)
> +{
> + struct msi_desc *entry;
> + u16 control;
> +
> + if (!dev->msi_enabled)
> + return;
> +
> + entry = irq_get_msi_desc(dev->irq);
> +
> + pci_intx_for_msi(dev, 0);
> + pci_msi_set_enable(dev, 0);
> + if (arch_restore_msi_irqs(dev))
> + __pci_write_msi_msg(entry, &entry->msg);
> +
> + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> + pci_msi_update_mask(entry, 0, 0);
> + control &= ~PCI_MSI_FLAGS_QSIZE;
> + control |= (entry->pci.msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
> + pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
> +}
> +
> +static void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
> +{
> + u16 ctrl;
> +
> + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
> + ctrl &= ~clear;
> + ctrl |= set;
> + pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
> +}
> +
> +static void __pci_restore_msix_state(struct pci_dev *dev)
> +{
> + struct msi_desc *entry;
> + bool write_msg;
> +
> + if (!dev->msix_enabled)
> + return;
> + BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
> +
> + /* route the table */
> + pci_intx_for_msi(dev, 0);
> + pci_msix_clear_and_set_ctrl(dev, 0,
> + PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
> +
> + write_msg = arch_restore_msi_irqs(dev);
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (write_msg)
> + __pci_write_msi_msg(entry, &entry->msg);
> + pci_msix_write_vector_ctrl(entry, entry->pci.msix_ctrl);
> + }
> +
> + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
> +}
> +
> +void pci_restore_msi_state(struct pci_dev *dev)
> +{
> + __pci_restore_msi_state(dev);
> + __pci_restore_msix_state(dev);
> +}
> +EXPORT_SYMBOL_GPL(pci_restore_msi_state);
> +
> +static struct msi_desc *
> +msi_setup_entry(struct pci_dev *dev, int nvec, struct irq_affinity *affd)
> +{
> + struct irq_affinity_desc *masks = NULL;
> + struct msi_desc *entry;
> + u16 control;
> +
> + if (affd)
> + masks = irq_create_affinity_masks(nvec, affd);
> +
> + /* MSI Entry Initialization */
> + entry = alloc_msi_entry(&dev->dev, nvec, masks);
> + if (!entry)
> + goto out;
> +
> + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> + /* Lies, damned lies, and MSIs */
> + if (dev->dev_flags & PCI_DEV_FLAGS_HAS_MSI_MASKING)
> + control |= PCI_MSI_FLAGS_MASKBIT;
> +
> + entry->pci.msi_attrib.is_msix = 0;
> + entry->pci.msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
> + entry->pci.msi_attrib.is_virtual = 0;
> + entry->pci.msi_attrib.entry_nr = 0;
> + entry->pci.msi_attrib.can_mask = !pci_msi_ignore_mask &&
> + !!(control & PCI_MSI_FLAGS_MASKBIT);
> + entry->pci.msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
> + entry->pci.msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
> + entry->pci.msi_attrib.multiple = ilog2(__roundup_pow_of_two(nvec));
> +
> + if (control & PCI_MSI_FLAGS_64BIT)
> + entry->pci.mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
> + else
> + entry->pci.mask_pos = dev->msi_cap + PCI_MSI_MASK_32;
> +
> + /* Save the initial mask status */
> + if (entry->pci.msi_attrib.can_mask)
> + pci_read_config_dword(dev, entry->pci.mask_pos, &entry->pci.msi_mask);
> +
> +out:
> + kfree(masks);
> + return entry;
> +}
> +
> +static int msi_verify_entries(struct pci_dev *dev)
> +{
> + struct msi_desc *entry;
> +
> + if (!dev->no_64bit_msi)
> + return 0;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (entry->msg.address_hi) {
> + pci_err(dev, "arch assigned 64-bit MSI address %#x%08x but device only supports 32 bits\n",
> + entry->msg.address_hi, entry->msg.address_lo);
> + return -EIO;
> + }
> + }
> + return 0;
> +}
> +
> +/**
> + * msi_capability_init - configure device's MSI capability structure
> + * @dev: pointer to the pci_dev data structure of MSI device function
> + * @nvec: number of interrupts to allocate
> + * @affd: description of automatic IRQ affinity assignments (may be %NULL)
> + *
> + * Setup the MSI capability structure of the device with the requested
> + * number of interrupts. A return value of zero indicates the successful
> + * setup of an entry with the new MSI IRQ. A negative return value indicates
> + * an error, and a positive return value indicates the number of interrupts
> + * which could have been allocated.
> + */
> +static int msi_capability_init(struct pci_dev *dev, int nvec,
> + struct irq_affinity *affd)
> +{
> + const struct attribute_group **groups;
> + struct msi_desc *entry;
> + int ret;
> +
> + pci_msi_set_enable(dev, 0); /* Disable MSI during set up */
> +
> + entry = msi_setup_entry(dev, nvec, affd);
> + if (!entry)
> + return -ENOMEM;
> +
> + /* All MSIs are unmasked by default; mask them all */
> + pci_msi_mask(entry, msi_multi_mask(entry));
> +
> + list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
> +
> + /* Configure MSI capability structure */
> + ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
> + if (ret)
> + goto err;
> +
> + ret = msi_verify_entries(dev);
> + if (ret)
> + goto err;
> +
> + groups = msi_populate_sysfs(&dev->dev);
> + if (IS_ERR(groups)) {
> + ret = PTR_ERR(groups);
> + goto err;
> + }
> +
> + dev->msi_irq_groups = groups;
> +
> + /* Set MSI enabled bits */
> + pci_intx_for_msi(dev, 0);
> + pci_msi_set_enable(dev, 1);
> + dev->msi_enabled = 1;
> +
> + pcibios_free_irq(dev);
> + dev->irq = entry->irq;
> + return 0;
> +
> +err:
> + pci_msi_unmask(entry, msi_multi_mask(entry));
> + free_msi_irqs(dev);
> + return ret;
> +}
> +
> +static void __iomem *msix_map_region(struct pci_dev *dev,
> + unsigned int nr_entries)
> +{
> + resource_size_t phys_addr;
> + u32 table_offset;
> + unsigned long flags;
> + u8 bir;
> +
> + pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE,
> + &table_offset);
> + bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
> + flags = pci_resource_flags(dev, bir);
> + if (!flags || (flags & IORESOURCE_UNSET))
> + return NULL;
> +
> + table_offset &= PCI_MSIX_TABLE_OFFSET;
> + phys_addr = pci_resource_start(dev, bir) + table_offset;
> +
> + return ioremap(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
> +}
> +
> +static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
> + struct msix_entry *entries, int nvec,
> + struct irq_affinity *affd)
> +{
> + struct irq_affinity_desc *curmsk, *masks = NULL;
> + struct msi_desc *entry;
> + void __iomem *addr;
> + int ret, i;
> + int vec_count = pci_msix_vec_count(dev);
> +
> + if (affd)
> + masks = irq_create_affinity_masks(nvec, affd);
> +
> + for (i = 0, curmsk = masks; i < nvec; i++) {
> + entry = alloc_msi_entry(&dev->dev, 1, curmsk);
> + if (!entry) {
> + if (!i)
> + iounmap(base);
> + else
> + free_msi_irqs(dev);
> + /* No enough memory. Don't try again */
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + entry->pci.msi_attrib.is_msix = 1;
> + entry->pci.msi_attrib.is_64 = 1;
> +
> + if (entries)
> + entry->pci.msi_attrib.entry_nr = entries[i].entry;
> + else
> + entry->pci.msi_attrib.entry_nr = i;
> +
> + entry->pci.msi_attrib.is_virtual =
> + entry->pci.msi_attrib.entry_nr >= vec_count;
> +
> + entry->pci.msi_attrib.can_mask = !pci_msi_ignore_mask &&
> + !entry->pci.msi_attrib.is_virtual;
> +
> + entry->pci.msi_attrib.default_irq = dev->irq;
> + entry->pci.mask_base = base;
> +
> + if (entry->pci.msi_attrib.can_mask) {
> + addr = pci_msix_desc_addr(entry);
> + entry->pci.msix_ctrl = readl(addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
> + }
> +
> + list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
> + if (masks)
> + curmsk++;
> + }
> + ret = 0;
> +out:
> + kfree(masks);
> + return ret;
> +}
> +
> +static void msix_update_entries(struct pci_dev *dev, struct msix_entry *entries)
> +{
> + struct msi_desc *entry;
> +
> + if (entries) {
> + for_each_pci_msi_entry(entry, dev) {
> + entries->vector = entry->irq;
> + entries++;
> + }
> + }
> +}
> +
> +static void msix_mask_all(void __iomem *base, int tsize)
> +{
> + u32 ctrl = PCI_MSIX_ENTRY_CTRL_MASKBIT;
> + int i;
> +
> + if (pci_msi_ignore_mask)
> + return;
> +
> + for (i = 0; i < tsize; i++, base += PCI_MSIX_ENTRY_SIZE)
> + writel(ctrl, base + PCI_MSIX_ENTRY_VECTOR_CTRL);
> +}
> +
> +/**
> + * msix_capability_init - configure device's MSI-X capability
> + * @dev: pointer to the pci_dev data structure of MSI-X device function
> + * @entries: pointer to an array of struct msix_entry entries
> + * @nvec: number of @entries
> + * @affd: Optional pointer to enable automatic affinity assignment
> + *
> + * Setup the MSI-X capability structure of device function with a
> + * single MSI-X IRQ. A return of zero indicates the successful setup of
> + * requested MSI-X entries with allocated IRQs or non-zero for otherwise.
> + **/
> +static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
> + int nvec, struct irq_affinity *affd)
> +{
> + const struct attribute_group **groups;
> + void __iomem *base;
> + int ret, tsize;
> + u16 control;
> +
> + /*
> + * Some devices require MSI-X to be enabled before the MSI-X
> + * registers can be accessed. Mask all the vectors to prevent
> + * interrupts coming in before they're fully set up.
> + */
> + pci_msix_clear_and_set_ctrl(dev, 0, PCI_MSIX_FLAGS_MASKALL |
> + PCI_MSIX_FLAGS_ENABLE);
> +
> + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
> + /* Request & Map MSI-X table region */
> + tsize = msix_table_size(control);
> + base = msix_map_region(dev, tsize);
> + if (!base) {
> + ret = -ENOMEM;
> + goto out_disable;
> + }
> +
> + /* Ensure that all table entries are masked. */
> + msix_mask_all(base, tsize);
> +
> + ret = msix_setup_entries(dev, base, entries, nvec, affd);
> + if (ret)
> + goto out_disable;
> +
> + ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
> + if (ret)
> + goto out_avail;
> +
> + /* Check if all MSI entries honor device restrictions */
> + ret = msi_verify_entries(dev);
> + if (ret)
> + goto out_free;
> +
> + msix_update_entries(dev, entries);
> +
> + groups = msi_populate_sysfs(&dev->dev);
> + if (IS_ERR(groups)) {
> + ret = PTR_ERR(groups);
> + goto out_free;
> + }
> +
> + dev->msi_irq_groups = groups;
> +
> + /* Set MSI-X enabled bits and unmask the function */
> + pci_intx_for_msi(dev, 0);
> + dev->msix_enabled = 1;
> + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
> +
> + pcibios_free_irq(dev);
> + return 0;
> +
> +out_avail:
> + if (ret < 0) {
> + /*
> + * If we had some success, report the number of IRQs
> + * we succeeded in setting up.
> + */
> + struct msi_desc *entry;
> + int avail = 0;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (entry->irq != 0)
> + avail++;
> + }
> + if (avail != 0)
> + ret = avail;
> + }
> +
> +out_free:
> + free_msi_irqs(dev);
> +
> +out_disable:
> + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> +
> + return ret;
> +}
> +
> +/**
> + * pci_msi_supported - check whether MSI may be enabled on a device
> + * @dev: pointer to the pci_dev data structure of MSI device function
> + * @nvec: how many MSIs have been requested?
> + *
> + * Look at global flags, the device itself, and its parent buses
> + * to determine if MSI/-X are supported for the device. If MSI/-X is
> + * supported return 1, else return 0.
> + **/
> +static int pci_msi_supported(struct pci_dev *dev, int nvec)
> +{
> + struct pci_bus *bus;
> +
> + /* MSI must be globally enabled and supported by the device */
> + if (!pci_msi_enable)
> + return 0;
> +
> + if (!dev || dev->no_msi)
> + return 0;
> +
> + /*
> + * You can't ask to have 0 or less MSIs configured.
> + * a) it's stupid ..
> + * b) the list manipulation code assumes nvec >= 1.
> + */
> + if (nvec < 1)
> + return 0;
> +
> + /*
> + * Any bridge which does NOT route MSI transactions from its
> + * secondary bus to its primary bus must set NO_MSI flag on
> + * the secondary pci_bus.
> + *
> + * The NO_MSI flag can either be set directly by:
> + * - arch-specific PCI host bus controller drivers (deprecated)
> + * - quirks for specific PCI bridges
> + *
> + * or indirectly by platform-specific PCI host bridge drivers by
> + * advertising the 'msi_domain' property, which results in
> + * the NO_MSI flag when no MSI domain is found for this bridge
> + * at probe time.
> + */
> + for (bus = dev->bus; bus; bus = bus->parent)
> + if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
> + return 0;
> +
> + return 1;
> +}
> +
> +/**
> + * pci_msi_vec_count - Return the number of MSI vectors a device can send
> + * @dev: device to report about
> + *
> + * This function returns the number of MSI vectors a device requested via
> + * Multiple Message Capable register. It returns a negative errno if the
> + * device is not capable sending MSI interrupts. Otherwise, the call succeeds
> + * and returns a power of two, up to a maximum of 2^5 (32), according to the
> + * MSI specification.
> + **/
> +int pci_msi_vec_count(struct pci_dev *dev)
> +{
> + int ret;
> + u16 msgctl;
> +
> + if (!dev->msi_cap)
> + return -EINVAL;
> +
> + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
> + ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(pci_msi_vec_count);
> +
> +static void pci_msi_shutdown(struct pci_dev *dev)
> +{
> + struct msi_desc *desc;
> +
> + if (!pci_msi_enable || !dev || !dev->msi_enabled)
> + return;
> +
> + BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
> + desc = first_pci_msi_entry(dev);
> +
> + pci_msi_set_enable(dev, 0);
> + pci_intx_for_msi(dev, 1);
> + dev->msi_enabled = 0;
> +
> + /* Return the device with MSI unmasked as initial states */
> + pci_msi_unmask(desc, msi_multi_mask(desc));
> +
> + /* Restore dev->irq to its default pin-assertion IRQ */
> + dev->irq = desc->pci.msi_attrib.default_irq;
> + pcibios_alloc_irq(dev);
> +}
> +
> +void pci_disable_msi(struct pci_dev *dev)
> +{
> + if (!pci_msi_enable || !dev || !dev->msi_enabled)
> + return;
> +
> + pci_msi_shutdown(dev);
> + free_msi_irqs(dev);
> +}
> +EXPORT_SYMBOL(pci_disable_msi);
> +
> +/**
> + * pci_msix_vec_count - return the number of device's MSI-X table entries
> + * @dev: pointer to the pci_dev data structure of MSI-X device function
> + * This function returns the number of device's MSI-X table entries and
> + * therefore the number of MSI-X vectors device is capable of sending.
> + * It returns a negative errno if the device is not capable of sending MSI-X
> + * interrupts.
> + **/
> +int pci_msix_vec_count(struct pci_dev *dev)
> +{
> + u16 control;
> +
> + if (!dev->msix_cap)
> + return -EINVAL;
> +
> + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
> + return msix_table_size(control);
> +}
> +EXPORT_SYMBOL(pci_msix_vec_count);
> +
> +static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
> + int nvec, struct irq_affinity *affd, int flags)
> +{
> + int nr_entries;
> + int i, j;
> +
> + if (!pci_msi_supported(dev, nvec) || dev->current_state != PCI_D0)
> + return -EINVAL;
> +
> + nr_entries = pci_msix_vec_count(dev);
> + if (nr_entries < 0)
> + return nr_entries;
> + if (nvec > nr_entries && !(flags & PCI_IRQ_VIRTUAL))
> + return nr_entries;
> +
> + if (entries) {
> + /* Check for any invalid entries */
> + for (i = 0; i < nvec; i++) {
> + if (entries[i].entry >= nr_entries)
> + return -EINVAL; /* invalid entry */
> + for (j = i + 1; j < nvec; j++) {
> + if (entries[i].entry == entries[j].entry)
> + return -EINVAL; /* duplicate entry */
> + }
> + }
> + }
> +
> + /* Check whether driver already requested for MSI IRQ */
> + if (dev->msi_enabled) {
> + pci_info(dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
> + return -EINVAL;
> + }
> + return msix_capability_init(dev, entries, nvec, affd);
> +}
> +
> +static void pci_msix_shutdown(struct pci_dev *dev)
> +{
> + struct msi_desc *entry;
> +
> + if (!pci_msi_enable || !dev || !dev->msix_enabled)
> + return;
> +
> + if (pci_dev_is_disconnected(dev)) {
> + dev->msix_enabled = 0;
> + return;
> + }
> +
> + /* Return the device with MSI-X masked as initial states */
> + for_each_pci_msi_entry(entry, dev)
> + pci_msix_mask(entry);
> +
> + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> + pci_intx_for_msi(dev, 1);
> + dev->msix_enabled = 0;
> + pcibios_alloc_irq(dev);
> +}
> +
> +void pci_disable_msix(struct pci_dev *dev)
> +{
> + if (!pci_msi_enable || !dev || !dev->msix_enabled)
> + return;
> +
> + pci_msix_shutdown(dev);
> + free_msi_irqs(dev);
> +}
> +EXPORT_SYMBOL(pci_disable_msix);
> +
> +void pci_no_msi(void)
> +{
> + pci_msi_enable = 0;
> +}
> +
> +/**
> + * pci_msi_enabled - is MSI enabled?
> + *
> + * Returns true if MSI has not been disabled by the command-line option
> + * pci=nomsi.
> + **/
> +int pci_msi_enabled(void)
> +{
> + return pci_msi_enable;
> +}
> +EXPORT_SYMBOL(pci_msi_enabled);
> +
> +static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
> + struct irq_affinity *affd)
> +{
> + int nvec;
> + int rc;
> +
> + if (!pci_msi_supported(dev, minvec) || dev->current_state != PCI_D0)
> + return -EINVAL;
> +
> + /* Check whether driver already requested MSI-X IRQs */
> + if (dev->msix_enabled) {
> + pci_info(dev, "can't enable MSI (MSI-X already enabled)\n");
> + return -EINVAL;
> + }
> +
> + if (maxvec < minvec)
> + return -ERANGE;
> +
> + if (WARN_ON_ONCE(dev->msi_enabled))
> + return -EINVAL;
> +
> + nvec = pci_msi_vec_count(dev);
> + if (nvec < 0)
> + return nvec;
> + if (nvec < minvec)
> + return -ENOSPC;
> +
> + if (nvec > maxvec)
> + nvec = maxvec;
> +
> + for (;;) {
> + if (affd) {
> + nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
> + if (nvec < minvec)
> + return -ENOSPC;
> + }
> +
> + rc = msi_capability_init(dev, nvec, affd);
> + if (rc == 0)
> + return nvec;
> +
> + if (rc < 0)
> + return rc;
> + if (rc < minvec)
> + return -ENOSPC;
> +
> + nvec = rc;
> + }
> +}
> +
> +/* deprecated, don't use */
> +int pci_enable_msi(struct pci_dev *dev)
> +{
> + int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
> + if (rc < 0)
> + return rc;
> + return 0;
> +}
> +EXPORT_SYMBOL(pci_enable_msi);
> +
> +static int __pci_enable_msix_range(struct pci_dev *dev,
> + struct msix_entry *entries, int minvec,
> + int maxvec, struct irq_affinity *affd,
> + int flags)
> +{
> + int rc, nvec = maxvec;
> +
> + if (maxvec < minvec)
> + return -ERANGE;
> +
> + if (WARN_ON_ONCE(dev->msix_enabled))
> + return -EINVAL;
> +
> + for (;;) {
> + if (affd) {
> + nvec = irq_calc_affinity_vectors(minvec, nvec, affd);
> + if (nvec < minvec)
> + return -ENOSPC;
> + }
> +
> + rc = __pci_enable_msix(dev, entries, nvec, affd, flags);
> + if (rc == 0)
> + return nvec;
> +
> + if (rc < 0)
> + return rc;
> + if (rc < minvec)
> + return -ENOSPC;
> +
> + nvec = rc;
> + }
> +}
> +
> +/**
> + * pci_enable_msix_range - configure device's MSI-X capability structure
> + * @dev: pointer to the pci_dev data structure of MSI-X device function
> + * @entries: pointer to an array of MSI-X entries
> + * @minvec: minimum number of MSI-X IRQs requested
> + * @maxvec: maximum number of MSI-X IRQs requested
> + *
> + * Setup the MSI-X capability structure of device function with a maximum
> + * possible number of interrupts in the range between @minvec and @maxvec
> + * upon its software driver call to request for MSI-X mode enabled on its
> + * hardware device function. It returns a negative errno if an error occurs.
> + * If it succeeds, it returns the actual number of interrupts allocated and
> + * indicates the successful configuration of MSI-X capability structure
> + * with new allocated MSI-X interrupts.
> + **/
> +int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
> + int minvec, int maxvec)
> +{
> + return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
> +}
> +EXPORT_SYMBOL(pci_enable_msix_range);
> +
> +/**
> + * pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
> + * @dev: PCI device to operate on
> + * @min_vecs: minimum number of vectors required (must be >= 1)
> + * @max_vecs: maximum (desired) number of vectors
> + * @flags: flags or quirks for the allocation
> + * @affd: optional description of the affinity requirements
> + *
> + * Allocate up to @max_vecs interrupt vectors for @dev, using MSI-X or MSI
> + * vectors if available, and fall back to a single legacy vector
> + * if neither is available. Return the number of vectors allocated,
> + * (which might be smaller than @max_vecs) if successful, or a negative
> + * error code on error. If less than @min_vecs interrupt vectors are
> + * available for @dev the function will fail with -ENOSPC.
> + *
> + * To get the Linux IRQ number used for a vector that can be passed to
> + * request_irq() use the pci_irq_vector() helper.
> + */
> +int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
> + unsigned int max_vecs, unsigned int flags,
> + struct irq_affinity *affd)
> +{
> + struct irq_affinity msi_default_affd = {0};
> + int nvecs = -ENOSPC;
> +
> + if (flags & PCI_IRQ_AFFINITY) {
> + if (!affd)
> + affd = &msi_default_affd;
> + } else {
> + if (WARN_ON(affd))
> + affd = NULL;
> + }
> +
> + if (flags & PCI_IRQ_MSIX) {
> + nvecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
> + affd, flags);
> + if (nvecs > 0)
> + return nvecs;
> + }
> +
> + if (flags & PCI_IRQ_MSI) {
> + nvecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
> + if (nvecs > 0)
> + return nvecs;
> + }
> +
> + /* use legacy IRQ if allowed */
> + if (flags & PCI_IRQ_LEGACY) {
> + if (min_vecs == 1 && dev->irq) {
> + /*
> + * Invoke the affinity spreading logic to ensure that
> + * the device driver can adjust queue configuration
> + * for the single interrupt case.
> + */
> + if (affd)
> + irq_create_affinity_masks(1, affd);
> + pci_intx(dev, 1);
> + return 1;
> + }
> + }
> +
> + return nvecs;
> +}
> +EXPORT_SYMBOL(pci_alloc_irq_vectors_affinity);
> +
> +/**
> + * pci_free_irq_vectors - free previously allocated IRQs for a device
> + * @dev: PCI device to operate on
> + *
> + * Undoes the allocations and enabling in pci_alloc_irq_vectors().
> + */
> +void pci_free_irq_vectors(struct pci_dev *dev)
> +{
> + pci_disable_msix(dev);
> + pci_disable_msi(dev);
> +}
> +EXPORT_SYMBOL(pci_free_irq_vectors);
> +
> +/**
> + * pci_irq_vector - return Linux IRQ number of a device vector
> + * @dev: PCI device to operate on
> + * @nr: Interrupt vector index (0-based)
> + *
> + * @nr has the following meanings depending on the interrupt mode:
> + * MSI-X: The index in the MSI-X vector table
> + * MSI: The index of the enabled MSI vectors
> + * INTx: Must be 0
> + *
> + * Return: The Linux interrupt number or -EINVAl if @nr is out of range.
> + */
> +int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
> +{
> + if (dev->msix_enabled) {
> + struct msi_desc *entry;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (entry->pci.msi_attrib.entry_nr == nr)
> + return entry->irq;
> + }
> + WARN_ON_ONCE(1);
> + return -EINVAL;
> + }
> +
> + if (dev->msi_enabled) {
> + struct msi_desc *entry = first_pci_msi_entry(dev);
> +
> + if (WARN_ON_ONCE(nr >= entry->nvec_used))
> + return -EINVAL;
> + } else {
> + if (WARN_ON_ONCE(nr > 0))
> + return -EINVAL;
> + }
> +
> + return dev->irq + nr;
> +}
> +EXPORT_SYMBOL(pci_irq_vector);
> +
> +/**
> + * pci_irq_get_affinity - return the affinity of a particular MSI vector
> + * @dev: PCI device to operate on
> + * @nr: device-relative interrupt vector index (0-based).
> + *
> + * @nr has the following meanings depending on the interrupt mode:
> + * MSI-X: The index in the MSI-X vector table
> + * MSI: The index of the enabled MSI vectors
> + * INTx: Must be 0
> + *
> + * Return: A cpumask pointer or NULL if @nr is out of range
> + */
> +const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
> +{
> + if (dev->msix_enabled) {
> + struct msi_desc *entry;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (entry->pci.msi_attrib.entry_nr == nr)
> + return &entry->affinity->mask;
> + }
> + WARN_ON_ONCE(1);
> + return NULL;
> + } else if (dev->msi_enabled) {
> + struct msi_desc *entry = first_pci_msi_entry(dev);
> +
> + if (WARN_ON_ONCE(!entry || !entry->affinity ||
> + nr >= entry->nvec_used))
> + return NULL;
> +
> + return &entry->affinity[nr].mask;
> + } else {
> + return cpu_possible_mask;
> + }
> +}
> +EXPORT_SYMBOL(pci_irq_get_affinity);
> +
> +struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
> +{
> + return to_pci_dev(desc->dev);
> +}
> +EXPORT_SYMBOL(msi_desc_to_pci_dev);
> +
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +/**
> + * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
> + * @irq_data: Pointer to interrupt data of the MSI interrupt
> + * @msg: Pointer to the message
> + */
> +static void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
> +{
> + struct msi_desc *desc = irq_data_get_msi_desc(irq_data);
> +
> + /*
> + * For MSI-X desc->irq is always equal to irq_data->irq. For
> + * MSI only the first interrupt of MULTI MSI passes the test.
> + */
> + if (desc->irq == irq_data->irq)
> + __pci_write_msi_msg(desc, msg);
> +}
> +
> +/**
> + * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
> + * @desc: Pointer to the MSI descriptor
> + *
> + * The ID number is only used within the irqdomain.
> + */
> +static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
> +{
> + struct pci_dev *dev = msi_desc_to_pci_dev(desc);
> +
> + return (irq_hw_number_t)desc->pci.msi_attrib.entry_nr |
> + pci_dev_id(dev) << 11 |
> + (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
> +}
> +
> +static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
> +{
> + return !desc->pci.msi_attrib.is_msix && desc->nvec_used > 1;
> +}
> +
> +/**
> + * pci_msi_domain_check_cap - Verify that @domain supports the capabilities
> + * for @dev
> + * @domain: The interrupt domain to check
> + * @info: The domain info for verification
> + * @dev: The device to check
> + *
> + * Returns:
> + * 0 if the functionality is supported
> + * 1 if Multi MSI is requested, but the domain does not support it
> + * -ENOTSUPP otherwise
> + */
> +int pci_msi_domain_check_cap(struct irq_domain *domain,
> + struct msi_domain_info *info, struct device *dev)
> +{
> + struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
> +
> + /* Special handling to support __pci_enable_msi_range() */
> + if (pci_msi_desc_is_multi_msi(desc) &&
> + !(info->flags & MSI_FLAG_MULTI_PCI_MSI))
> + return 1;
> + else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
> + return -ENOTSUPP;
> +
> + return 0;
> +}
> +
> +static int pci_msi_domain_handle_error(struct irq_domain *domain,
> + struct msi_desc *desc, int error)
> +{
> + /* Special handling to support __pci_enable_msi_range() */
> + if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
> + return 1;
> +
> + return error;
> +}
> +
> +static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
> + struct msi_desc *desc)
> +{
> + arg->desc = desc;
> + arg->hwirq = pci_msi_domain_calc_hwirq(desc);
> +}
> +
> +static struct msi_domain_ops pci_msi_domain_ops_default = {
> + .set_desc = pci_msi_domain_set_desc,
> + .msi_check = pci_msi_domain_check_cap,
> + .handle_error = pci_msi_domain_handle_error,
> +};
> +
> +static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
> +{
> + struct msi_domain_ops *ops = info->ops;
> +
> + if (ops == NULL) {
> + info->ops = &pci_msi_domain_ops_default;
> + } else {
> + if (ops->set_desc == NULL)
> + ops->set_desc = pci_msi_domain_set_desc;
> + if (ops->msi_check == NULL)
> + ops->msi_check = pci_msi_domain_check_cap;
> + if (ops->handle_error == NULL)
> + ops->handle_error = pci_msi_domain_handle_error;
> + }
> +}
> +
> +static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
> +{
> + struct irq_chip *chip = info->chip;
> +
> + BUG_ON(!chip);
> + if (!chip->irq_write_msi_msg)
> + chip->irq_write_msi_msg = pci_msi_domain_write_msg;
> + if (!chip->irq_mask)
> + chip->irq_mask = pci_msi_mask_irq;
> + if (!chip->irq_unmask)
> + chip->irq_unmask = pci_msi_unmask_irq;
> +}
> +
> +/**
> + * pci_msi_create_irq_domain - Create a MSI interrupt domain
> + * @fwnode: Optional fwnode of the interrupt controller
> + * @info: MSI domain info
> + * @parent: Parent irq domain
> + *
> + * Updates the domain and chip ops and creates a MSI interrupt domain.
> + *
> + * Returns:
> + * A domain pointer or NULL in case of failure.
> + */
> +struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
> + struct msi_domain_info *info,
> + struct irq_domain *parent)
> +{
> + struct irq_domain *domain;
> +
> + if (WARN_ON(info->flags & MSI_FLAG_LEVEL_CAPABLE))
> + info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
> +
> + if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
> + pci_msi_domain_update_dom_ops(info);
> + if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
> + pci_msi_domain_update_chip_ops(info);
> +
> + info->flags |= MSI_FLAG_ACTIVATE_EARLY;
> + if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
> + info->flags |= MSI_FLAG_MUST_REACTIVATE;
> +
> + /* PCI-MSI is oneshot-safe */
> + info->chip->flags |= IRQCHIP_ONESHOT_SAFE;
> +
> + domain = msi_create_irq_domain(fwnode, info, parent);
> + if (!domain)
> + return NULL;
> +
> + irq_domain_update_bus_token(domain, DOMAIN_BUS_PCI_MSI);
> + return domain;
> +}
> +EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
> +
> +/*
> + * Users of the generic MSI infrastructure expect a device to have a single ID,
> + * so with DMA aliases we have to pick the least-worst compromise. Devices with
> + * DMA phantom functions tend to still emit MSIs from the real function number,
> + * so we ignore those and only consider topological aliases where either the
> + * alias device or RID appears on a different bus number. We also make the
> + * reasonable assumption that bridges are walked in an upstream direction (so
> + * the last one seen wins), and the much braver assumption that the most likely
> + * case is that of PCI->PCIe so we should always use the alias RID. This echoes
> + * the logic from intel_irq_remapping's set_msi_sid(), which presumably works
> + * well enough in practice; in the face of the horrible PCIe<->PCI-X conditions
> + * for taking ownership all we can really do is close our eyes and hope...
> + */
> +static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
> +{
> + u32 *pa = data;
> + u8 bus = PCI_BUS_NUM(*pa);
> +
> + if (pdev->bus->number != bus || PCI_BUS_NUM(alias) != bus)
> + *pa = alias;
> +
> + return 0;
> +}
> +
> +/**
> + * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
> + * @domain: The interrupt domain
> + * @pdev: The PCI device.
> + *
> + * The RID for a device is formed from the alias, with a firmware
> + * supplied mapping applied
> + *
> + * Returns: The RID.
> + */
> +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
> +{
> + struct device_node *of_node;
> + u32 rid = pci_dev_id(pdev);
> +
> + pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> +
> + of_node = irq_domain_get_of_node(domain);
> + rid = of_node ? of_msi_map_id(&pdev->dev, of_node, rid) :
> + iort_msi_map_id(&pdev->dev, rid);
> +
> + return rid;
> +}
> +
> +/**
> + * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
> + * @pdev: The PCI device
> + *
> + * Use the firmware data to find a device-specific MSI domain
> + * (i.e. not one that is set as a default).
> + *
> + * Returns: The corresponding MSI domain or NULL if none has been found.
> + */
> +struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
> +{
> + struct irq_domain *dom;
> + u32 rid = pci_dev_id(pdev);
> +
> + pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
> + dom = of_msi_map_get_device_domain(&pdev->dev, rid, DOMAIN_BUS_PCI_MSI);
> + if (!dom)
> + dom = iort_get_device_domain(&pdev->dev, rid,
> + DOMAIN_BUS_PCI_MSI);
> + return dom;
> +}
> +
> +/**
> + * pci_dev_has_special_msi_domain - Check whether the device is handled by
> + * a non-standard PCI-MSI domain
> + * @pdev: The PCI device to check.
> + *
> + * Returns: True if the device irqdomain or the bus irqdomain is
> + * non-standard PCI/MSI.
> + */
> +bool pci_dev_has_special_msi_domain(struct pci_dev *pdev)
> +{
> + struct irq_domain *dom = dev_get_msi_domain(&pdev->dev);
> +
> + if (!dom)
> + dom = dev_get_msi_domain(&pdev->bus->dev);
> +
> + if (!dom)
> + return true;
> +
> + return dom->bus_token != DOMAIN_BUS_PCI_MSI;
> +}
> +
> +#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
> +#endif /* CONFIG_PCI_MSI */
> +
> +void pci_msi_init(struct pci_dev *dev)
> +{
> + u16 ctrl;
> +
> + /*
> + * Disable the MSI hardware to avoid screaming interrupts
> + * during boot. This is the power on reset default so
> + * usually this should be a noop.
> + */
> + dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
> + if (!dev->msi_cap)
> + return;
> +
> + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
> + if (ctrl & PCI_MSI_FLAGS_ENABLE)
> + pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
> + ctrl & ~PCI_MSI_FLAGS_ENABLE);
> +
> + if (!(ctrl & PCI_MSI_FLAGS_64BIT))
> + dev->no_64bit_msi = 1;
> +}
> +
> +void pci_msix_init(struct pci_dev *dev)
> +{
> + u16 ctrl;
> +
> + dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> + if (!dev->msix_cap)
> + return;
> +
> + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
> + if (ctrl & PCI_MSIX_FLAGS_ENABLE)
> + pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
> + ctrl & ~PCI_MSIX_FLAGS_ENABLE);
> +}
>
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