linux/drivers/pci/msi.c
Eric W. Biederman f7feaca77d msi: Make MSI useable more architectures
The arch hooks arch_setup_msi_irq and arch_teardown_msi_irq are now
responsible for allocating and freeing the linux irq in addition to
setting up the the linux irq to work with the interrupt.

arch_setup_msi_irq now takes a pci_device and a msi_desc and returns
an irq.

With this change in place this code should be useable by all platforms
except those that won't let the OS touch the hardware like ppc RTAS.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-02-07 15:50:08 -08:00

859 lines
21 KiB
C

/*
* File: msi.c
* Purpose: PCI Message Signaled Interrupt (MSI)
*
* Copyright (C) 2003-2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#include <linux/err.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/msi.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/smp.h>
#include "pci.h"
#include "msi.h"
static struct kmem_cache* msi_cachep;
static int pci_msi_enable = 1;
static int msi_cache_init(void)
{
msi_cachep = kmem_cache_create("msi_cache", sizeof(struct msi_desc),
0, SLAB_HWCACHE_ALIGN, NULL, NULL);
if (!msi_cachep)
return -ENOMEM;
return 0;
}
static void msi_set_mask_bit(unsigned int irq, int flag)
{
struct msi_desc *entry;
entry = get_irq_msi(irq);
BUG_ON(!entry || !entry->dev);
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
if (entry->msi_attrib.maskbit) {
int pos;
u32 mask_bits;
pos = (long)entry->mask_base;
pci_read_config_dword(entry->dev, pos, &mask_bits);
mask_bits &= ~(1);
mask_bits |= flag;
pci_write_config_dword(entry->dev, pos, mask_bits);
}
break;
case PCI_CAP_ID_MSIX:
{
int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
writel(flag, entry->mask_base + offset);
break;
}
default:
BUG();
break;
}
}
void read_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_msi(irq);
switch(entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
struct pci_dev *dev = entry->dev;
int pos = entry->msi_attrib.pos;
u16 data;
pci_read_config_dword(dev, msi_lower_address_reg(pos),
&msg->address_lo);
if (entry->msi_attrib.is_64) {
pci_read_config_dword(dev, msi_upper_address_reg(pos),
&msg->address_hi);
pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
} else {
msg->address_hi = 0;
pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
}
msg->data = data;
break;
}
case PCI_CAP_ID_MSIX:
{
void __iomem *base;
base = entry->mask_base +
entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
msg->data = readl(base + PCI_MSIX_ENTRY_DATA_OFFSET);
break;
}
default:
BUG();
}
}
void write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
struct msi_desc *entry = get_irq_msi(irq);
switch (entry->msi_attrib.type) {
case PCI_CAP_ID_MSI:
{
struct pci_dev *dev = entry->dev;
int pos = entry->msi_attrib.pos;
pci_write_config_dword(dev, msi_lower_address_reg(pos),
msg->address_lo);
if (entry->msi_attrib.is_64) {
pci_write_config_dword(dev, msi_upper_address_reg(pos),
msg->address_hi);
pci_write_config_word(dev, msi_data_reg(pos, 1),
msg->data);
} else {
pci_write_config_word(dev, msi_data_reg(pos, 0),
msg->data);
}
break;
}
case PCI_CAP_ID_MSIX:
{
void __iomem *base;
base = entry->mask_base +
entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
writel(msg->address_lo,
base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
writel(msg->address_hi,
base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
writel(msg->data, base + PCI_MSIX_ENTRY_DATA_OFFSET);
break;
}
default:
BUG();
}
}
void mask_msi_irq(unsigned int irq)
{
msi_set_mask_bit(irq, 1);
}
void unmask_msi_irq(unsigned int irq)
{
msi_set_mask_bit(irq, 0);
}
static int msi_free_irq(struct pci_dev* dev, int irq);
static int msi_init(void)
{
static int status = -ENOMEM;
if (!status)
return status;
status = msi_cache_init();
if (status < 0) {
pci_msi_enable = 0;
printk(KERN_WARNING "PCI: MSI cache init failed\n");
return status;
}
return status;
}
static struct msi_desc* alloc_msi_entry(void)
{
struct msi_desc *entry;
entry = kmem_cache_zalloc(msi_cachep, GFP_KERNEL);
if (!entry)
return NULL;
entry->link.tail = entry->link.head = 0; /* single message */
entry->dev = NULL;
return entry;
}
static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
{
u16 control;
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (type == PCI_CAP_ID_MSI) {
/* Set enabled bits to single MSI & enable MSI_enable bit */
msi_enable(control, 1);
pci_write_config_word(dev, msi_control_reg(pos), control);
dev->msi_enabled = 1;
} else {
msix_enable(control);
pci_write_config_word(dev, msi_control_reg(pos), control);
dev->msix_enabled = 1;
}
pci_intx(dev, 0); /* disable intx */
}
void disable_msi_mode(struct pci_dev *dev, int pos, int type)
{
u16 control;
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (type == PCI_CAP_ID_MSI) {
/* Set enabled bits to single MSI & enable MSI_enable bit */
msi_disable(control);
pci_write_config_word(dev, msi_control_reg(pos), control);
dev->msi_enabled = 0;
} else {
msix_disable(control);
pci_write_config_word(dev, msi_control_reg(pos), control);
dev->msix_enabled = 0;
}
pci_intx(dev, 1); /* enable intx */
}
#ifdef CONFIG_PM
static int __pci_save_msi_state(struct pci_dev *dev)
{
int pos, i = 0;
u16 control;
struct pci_cap_saved_state *save_state;
u32 *cap;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (pos <= 0 || dev->no_msi)
return 0;
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (!(control & PCI_MSI_FLAGS_ENABLE))
return 0;
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5,
GFP_KERNEL);
if (!save_state) {
printk(KERN_ERR "Out of memory in pci_save_msi_state\n");
return -ENOMEM;
}
cap = &save_state->data[0];
pci_read_config_dword(dev, pos, &cap[i++]);
control = cap[0] >> 16;
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]);
pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]);
} else
pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]);
save_state->cap_nr = PCI_CAP_ID_MSI;
pci_add_saved_cap(dev, save_state);
return 0;
}
static void __pci_restore_msi_state(struct pci_dev *dev)
{
int i = 0, pos;
u16 control;
struct pci_cap_saved_state *save_state;
u32 *cap;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI);
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!save_state || pos <= 0)
return;
cap = &save_state->data[0];
control = cap[i++] >> 16;
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]);
if (control & PCI_MSI_FLAGS_64BIT) {
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]);
pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]);
} else
pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]);
if (control & PCI_MSI_FLAGS_MASKBIT)
pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
pci_remove_saved_cap(save_state);
kfree(save_state);
}
static int __pci_save_msix_state(struct pci_dev *dev)
{
int pos;
int irq, head, tail = 0;
u16 control;
struct pci_cap_saved_state *save_state;
if (!dev->msix_enabled)
return 0;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos <= 0 || dev->no_msi)
return 0;
/* save the capability */
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (!(control & PCI_MSIX_FLAGS_ENABLE))
return 0;
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16),
GFP_KERNEL);
if (!save_state) {
printk(KERN_ERR "Out of memory in pci_save_msix_state\n");
return -ENOMEM;
}
*((u16 *)&save_state->data[0]) = control;
/* save the table */
irq = head = dev->first_msi_irq;
while (head != tail) {
struct msi_desc *entry;
entry = get_irq_msi(irq);
read_msi_msg(irq, &entry->msg_save);
tail = entry->link.tail;
irq = tail;
}
save_state->cap_nr = PCI_CAP_ID_MSIX;
pci_add_saved_cap(dev, save_state);
return 0;
}
int pci_save_msi_state(struct pci_dev *dev)
{
int rc;
rc = __pci_save_msi_state(dev);
if (rc)
return rc;
rc = __pci_save_msix_state(dev);
return rc;
}
static void __pci_restore_msix_state(struct pci_dev *dev)
{
u16 save;
int pos;
int irq, head, tail = 0;
struct msi_desc *entry;
struct pci_cap_saved_state *save_state;
if (!dev->msix_enabled)
return;
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX);
if (!save_state)
return;
save = *((u16 *)&save_state->data[0]);
pci_remove_saved_cap(save_state);
kfree(save_state);
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos <= 0)
return;
/* route the table */
irq = head = dev->first_msi_irq;
while (head != tail) {
entry = get_irq_msi(irq);
write_msi_msg(irq, &entry->msg_save);
tail = entry->link.tail;
irq = tail;
}
pci_write_config_word(dev, msi_control_reg(pos), save);
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
}
void pci_restore_msi_state(struct pci_dev *dev)
{
__pci_restore_msi_state(dev);
__pci_restore_msix_state(dev);
}
#endif /* CONFIG_PM */
/**
* msi_capability_init - configure device's MSI capability structure
* @dev: pointer to the pci_dev data structure of MSI device function
*
* Setup the MSI capability structure of device function with a single
* MSI irq, regardless of device function is capable of handling
* multiple messages. A return of zero indicates the successful setup
* of an entry zero with the new MSI irq or non-zero for otherwise.
**/
static int msi_capability_init(struct pci_dev *dev)
{
struct msi_desc *entry;
int pos, irq;
u16 control;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
pci_read_config_word(dev, msi_control_reg(pos), &control);
/* MSI Entry Initialization */
entry = alloc_msi_entry();
if (!entry)
return -ENOMEM;
entry->msi_attrib.type = PCI_CAP_ID_MSI;
entry->msi_attrib.is_64 = is_64bit_address(control);
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = is_mask_bit_support(control);
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
entry->msi_attrib.pos = pos;
if (is_mask_bit_support(control)) {
entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos,
is_64bit_address(control));
}
entry->dev = dev;
if (entry->msi_attrib.maskbit) {
unsigned int maskbits, temp;
/* All MSIs are unmasked by default, Mask them all */
pci_read_config_dword(dev,
msi_mask_bits_reg(pos, is_64bit_address(control)),
&maskbits);
temp = (1 << multi_msi_capable(control));
temp = ((temp - 1) & ~temp);
maskbits |= temp;
pci_write_config_dword(dev,
msi_mask_bits_reg(pos, is_64bit_address(control)),
maskbits);
}
/* Configure MSI capability structure */
irq = arch_setup_msi_irq(dev, entry);
if (irq < 0) {
kmem_cache_free(msi_cachep, entry);
return irq;
}
entry->link.head = irq;
entry->link.tail = irq;
dev->first_msi_irq = irq;
set_irq_msi(irq, entry);
/* Set MSI enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
dev->irq = irq;
return 0;
}
/**
* 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
*
* 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 msi_desc *head = NULL, *tail = NULL, *entry = NULL;
int irq, pos, i, j, nr_entries, temp = 0;
unsigned long phys_addr;
u32 table_offset;
u16 control;
u8 bir;
void __iomem *base;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
/* Request & Map MSI-X table region */
pci_read_config_word(dev, msi_control_reg(pos), &control);
nr_entries = multi_msix_capable(control);
pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset);
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
table_offset &= ~PCI_MSIX_FLAGS_BIRMASK;
phys_addr = pci_resource_start (dev, bir) + table_offset;
base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
if (base == NULL)
return -ENOMEM;
/* MSI-X Table Initialization */
for (i = 0; i < nvec; i++) {
entry = alloc_msi_entry();
if (!entry)
break;
j = entries[i].entry;
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = j;
entry->msi_attrib.maskbit = 1;
entry->msi_attrib.default_irq = dev->irq;
entry->msi_attrib.pos = pos;
entry->dev = dev;
entry->mask_base = base;
/* Configure MSI-X capability structure */
irq = arch_setup_msi_irq(dev, entry);
if (irq < 0) {
kmem_cache_free(msi_cachep, entry);
break;
}
entries[i].vector = irq;
if (!head) {
entry->link.head = irq;
entry->link.tail = irq;
head = entry;
} else {
entry->link.head = temp;
entry->link.tail = tail->link.tail;
tail->link.tail = irq;
head->link.head = irq;
}
temp = irq;
tail = entry;
set_irq_msi(irq, entry);
}
if (i != nvec) {
int avail = i - 1;
i--;
for (; i >= 0; i--) {
irq = (entries + i)->vector;
msi_free_irq(dev, irq);
(entries + i)->vector = 0;
}
/* If we had some success report the number of irqs
* we succeeded in setting up.
*/
if (avail <= 0)
avail = -EBUSY;
return avail;
}
dev->first_msi_irq = entries[0].vector;
/* Set MSI-X enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
return 0;
}
/**
* pci_msi_supported - check whether MSI may be enabled on device
* @dev: pointer to the pci_dev data structure of MSI device function
*
* Look at global flags, the device itself, and its parent busses
* to return 0 if MSI are supported for the device.
**/
static
int pci_msi_supported(struct pci_dev * dev)
{
struct pci_bus *bus;
/* MSI must be globally enabled and supported by the device */
if (!pci_msi_enable || !dev || dev->no_msi)
return -EINVAL;
/* Any bridge which does NOT route MSI transactions from it's
* secondary bus to it's primary bus must set NO_MSI flag on
* the secondary pci_bus.
* We expect only arch-specific PCI host bus controller driver
* or quirks for specific PCI bridges to be setting NO_MSI.
*/
for (bus = dev->bus; bus; bus = bus->parent)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;
return 0;
}
/**
* pci_enable_msi - configure device's MSI capability structure
* @dev: pointer to the pci_dev data structure of MSI device function
*
* Setup the MSI capability structure of device function with
* a single MSI irq upon its software driver call to request for
* MSI mode enabled on its hardware device function. A return of zero
* indicates the successful setup of an entry zero with the new MSI
* irq or non-zero for otherwise.
**/
int pci_enable_msi(struct pci_dev* dev)
{
int pos, status;
if (pci_msi_supported(dev) < 0)
return -EINVAL;
status = msi_init();
if (status < 0)
return status;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
return -EINVAL;
WARN_ON(!!dev->msi_enabled);
/* Check whether driver already requested for MSI-X irqs */
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos > 0 && dev->msix_enabled) {
printk(KERN_INFO "PCI: %s: Can't enable MSI. "
"Device already has MSI-X enabled\n",
pci_name(dev));
return -EINVAL;
}
status = msi_capability_init(dev);
return status;
}
void pci_disable_msi(struct pci_dev* dev)
{
struct msi_desc *entry;
int pos, default_irq;
u16 control;
if (!pci_msi_enable)
return;
if (!dev)
return;
if (!dev->msi_enabled)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
return;
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (!(control & PCI_MSI_FLAGS_ENABLE))
return;
disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
entry = get_irq_msi(dev->first_msi_irq);
if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
return;
}
if (irq_has_action(dev->first_msi_irq)) {
printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
"free_irq() on MSI irq %d\n",
pci_name(dev), dev->first_msi_irq);
BUG_ON(irq_has_action(dev->first_msi_irq));
} else {
default_irq = entry->msi_attrib.default_irq;
msi_free_irq(dev, dev->first_msi_irq);
/* Restore dev->irq to its default pin-assertion irq */
dev->irq = default_irq;
}
dev->first_msi_irq = 0;
}
static int msi_free_irq(struct pci_dev* dev, int irq)
{
struct msi_desc *entry;
int head, entry_nr, type;
void __iomem *base;
entry = get_irq_msi(irq);
if (!entry || entry->dev != dev) {
return -EINVAL;
}
type = entry->msi_attrib.type;
entry_nr = entry->msi_attrib.entry_nr;
head = entry->link.head;
base = entry->mask_base;
get_irq_msi(entry->link.head)->link.tail = entry->link.tail;
get_irq_msi(entry->link.tail)->link.head = entry->link.head;
arch_teardown_msi_irq(irq);
kmem_cache_free(msi_cachep, entry);
if (type == PCI_CAP_ID_MSIX) {
writel(1, base + entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
if (head == irq)
iounmap(base);
}
return 0;
}
/**
* pci_enable_msix - 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
* @nvec: number of MSI-X irqs requested for allocation by device driver
*
* Setup the MSI-X capability structure of device function with the number
* of requested irqs upon its software driver call to request for
* MSI-X mode enabled on its hardware device function. A return of zero
* indicates the successful configuration of MSI-X capability structure
* with new allocated MSI-X irqs. A return of < 0 indicates a failure.
* Or a return of > 0 indicates that driver request is exceeding the number
* of irqs available. Driver should use the returned value to re-send
* its request.
**/
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
{
int status, pos, nr_entries;
int i, j;
u16 control;
if (!entries || pci_msi_supported(dev) < 0)
return -EINVAL;
status = msi_init();
if (status < 0)
return status;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (!pos)
return -EINVAL;
pci_read_config_word(dev, msi_control_reg(pos), &control);
nr_entries = multi_msix_capable(control);
if (nvec > nr_entries)
return -EINVAL;
/* 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 */
}
}
WARN_ON(!!dev->msix_enabled);
/* Check whether driver already requested for MSI irq */
if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
dev->msi_enabled) {
printk(KERN_INFO "PCI: %s: Can't enable MSI-X. "
"Device already has an MSI irq assigned\n",
pci_name(dev));
return -EINVAL;
}
status = msix_capability_init(dev, entries, nvec);
return status;
}
void pci_disable_msix(struct pci_dev* dev)
{
int irq, head, tail = 0, warning = 0;
int pos;
u16 control;
if (!pci_msi_enable)
return;
if (!dev)
return;
if (!dev->msix_enabled)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (!pos)
return;
pci_read_config_word(dev, msi_control_reg(pos), &control);
if (!(control & PCI_MSIX_FLAGS_ENABLE))
return;
disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
irq = head = dev->first_msi_irq;
while (head != tail) {
tail = get_irq_msi(irq)->link.tail;
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */
msi_free_irq(dev, irq);
irq = tail;
}
msi_free_irq(dev, irq);
if (warning) {
printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without "
"free_irq() on all MSI-X irqs\n",
pci_name(dev));
BUG_ON(warning > 0);
}
dev->first_msi_irq = 0;
}
/**
* msi_remove_pci_irq_vectors - reclaim MSI(X) irqs to unused state
* @dev: pointer to the pci_dev data structure of MSI(X) device function
*
* Being called during hotplug remove, from which the device function
* is hot-removed. All previous assigned MSI/MSI-X irqs, if
* allocated for this device function, are reclaimed to unused state,
* which may be used later on.
**/
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
{
if (!pci_msi_enable || !dev)
return;
if (dev->msi_enabled) {
if (irq_has_action(dev->first_msi_irq)) {
printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
"called without free_irq() on MSI irq %d\n",
pci_name(dev), dev->first_msi_irq);
BUG_ON(irq_has_action(dev->first_msi_irq));
} else /* Release MSI irq assigned to this device */
msi_free_irq(dev, dev->first_msi_irq);
}
if (dev->msix_enabled) {
int irq, head, tail = 0, warning = 0;
void __iomem *base = NULL;
irq = head = dev->first_msi_irq;
while (head != tail) {
tail = get_irq_msi(irq)->link.tail;
base = get_irq_msi(irq)->mask_base;
if (irq_has_action(irq))
warning = 1;
else if (irq != head) /* Release MSI-X irq */
msi_free_irq(dev, irq);
irq = tail;
}
msi_free_irq(dev, irq);
if (warning) {
iounmap(base);
printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
"called without free_irq() on all MSI-X irqs\n",
pci_name(dev));
BUG_ON(warning > 0);
}
}
}
void pci_no_msi(void)
{
pci_msi_enable = 0;
}
EXPORT_SYMBOL(pci_enable_msi);
EXPORT_SYMBOL(pci_disable_msi);
EXPORT_SYMBOL(pci_enable_msix);
EXPORT_SYMBOL(pci_disable_msix);