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Message-ID: <20211126223824.974731648@linutronix.de>
Date: Sat, 27 Nov 2021 02:18:58 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Bjorn Helgaas <helgaas@...nel.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,
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,
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,
Juergen Gross <jgross@...e.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>
Subject: [patch 15/22] PCI/MSI: Move code into a separate directory
msi.c is getting larger and really could do with a splitup. Move it into
it's own directory to prepare for that.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
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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