mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
msi: Kill msi_lookup_irq
The function msi_lookup_irq was horrible. As a side effect of running it changed dev->irq, and then the callers would need to change it back. In addition it does a global scan through all of the irqs, which seems to be the sole justification of the msi_lock. To remove the neede for msi_lookup_irq I added first_msi_irq to struct pci_dev. Then depending on the context I replaced msi_lookup_irq with dev->first_msi_irq, dev->msi_enabled, or dev->msix_enabled. msi_enabled and msix_enabled were already present in pci_dev for other reasons. 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>
This commit is contained in:
Eric W. Biederman
Greg Kroah-Hartman
parent
8fed4b6523
commit
ded86d8d37
@ -272,28 +272,6 @@ void disable_msi_mode(struct pci_dev *dev, int pos, int type)
|
||||
pci_intx(dev, 1); /* enable intx */
|
||||
}
|
||||
|
||||
static int msi_lookup_irq(struct pci_dev *dev, int type)
|
||||
{
|
||||
int irq;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&msi_lock, flags);
|
||||
for (irq = 0; irq < NR_IRQS; irq++) {
|
||||
if (!msi_desc[irq] || msi_desc[irq]->dev != dev ||
|
||||
msi_desc[irq]->msi_attrib.type != type ||
|
||||
msi_desc[irq]->msi_attrib.default_irq != dev->irq)
|
||||
continue;
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
/* This pre-assigned MSI irq for this device
|
||||
already exists. Override dev->irq with this irq */
|
||||
dev->irq = irq;
|
||||
return 0;
|
||||
}
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
|
||||
return -EACCES;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int __pci_save_msi_state(struct pci_dev *dev)
|
||||
{
|
||||
@ -364,11 +342,13 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
|
||||
static int __pci_save_msix_state(struct pci_dev *dev)
|
||||
{
|
||||
int pos;
|
||||
int temp;
|
||||
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;
|
||||
@ -386,13 +366,7 @@ static int __pci_save_msix_state(struct pci_dev *dev)
|
||||
*((u16 *)&save_state->data[0]) = control;
|
||||
|
||||
/* save the table */
|
||||
temp = dev->irq;
|
||||
if (msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
|
||||
kfree(save_state);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
irq = head = dev->irq;
|
||||
irq = head = dev->first_msi_irq;
|
||||
while (head != tail) {
|
||||
struct msi_desc *entry;
|
||||
|
||||
@ -402,7 +376,6 @@ static int __pci_save_msix_state(struct pci_dev *dev)
|
||||
tail = msi_desc[irq]->link.tail;
|
||||
irq = tail;
|
||||
}
|
||||
dev->irq = temp;
|
||||
|
||||
save_state->cap_nr = PCI_CAP_ID_MSIX;
|
||||
pci_add_saved_cap(dev, save_state);
|
||||
@ -428,9 +401,11 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
|
||||
int pos;
|
||||
int irq, head, tail = 0;
|
||||
struct msi_desc *entry;
|
||||
int temp;
|
||||
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;
|
||||
@ -443,10 +418,7 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
|
||||
return;
|
||||
|
||||
/* route the table */
|
||||
temp = dev->irq;
|
||||
if (msi_lookup_irq(dev, PCI_CAP_ID_MSIX))
|
||||
return;
|
||||
irq = head = dev->irq;
|
||||
irq = head = dev->first_msi_irq;
|
||||
while (head != tail) {
|
||||
entry = msi_desc[irq];
|
||||
write_msi_msg(irq, &entry->msg_save);
|
||||
@ -454,7 +426,6 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
|
||||
tail = msi_desc[irq]->link.tail;
|
||||
irq = tail;
|
||||
}
|
||||
dev->irq = temp;
|
||||
|
||||
pci_write_config_word(dev, msi_control_reg(pos), save);
|
||||
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
|
||||
@ -524,6 +495,7 @@ static int msi_capability_init(struct pci_dev *dev)
|
||||
return status;
|
||||
}
|
||||
|
||||
dev->first_msi_irq = irq;
|
||||
attach_msi_entry(entry, irq);
|
||||
/* Set MSI enabled bits */
|
||||
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
|
||||
@ -620,6 +592,7 @@ static int msix_capability_init(struct pci_dev *dev,
|
||||
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);
|
||||
|
||||
@ -667,13 +640,11 @@ int pci_msi_supported(struct pci_dev * dev)
|
||||
**/
|
||||
int pci_enable_msi(struct pci_dev* dev)
|
||||
{
|
||||
int pos, temp, status;
|
||||
int pos, status;
|
||||
|
||||
if (pci_msi_supported(dev) < 0)
|
||||
return -EINVAL;
|
||||
|
||||
temp = dev->irq;
|
||||
|
||||
status = msi_init();
|
||||
if (status < 0)
|
||||
return status;
|
||||
@ -682,15 +653,14 @@ int pci_enable_msi(struct pci_dev* dev)
|
||||
if (!pos)
|
||||
return -EINVAL;
|
||||
|
||||
WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSI));
|
||||
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 && !msi_lookup_irq(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 irq assigned\n",
|
||||
"Device already has MSI-X enabled\n",
|
||||
pci_name(dev));
|
||||
dev->irq = temp;
|
||||
return -EINVAL;
|
||||
}
|
||||
status = msi_capability_init(dev);
|
||||
@ -709,6 +679,9 @@ void pci_disable_msi(struct pci_dev* dev)
|
||||
if (!dev)
|
||||
return;
|
||||
|
||||
if (!dev->msi_enabled)
|
||||
return;
|
||||
|
||||
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
||||
if (!pos)
|
||||
return;
|
||||
@ -717,28 +690,30 @@ void pci_disable_msi(struct pci_dev* dev)
|
||||
if (!(control & PCI_MSI_FLAGS_ENABLE))
|
||||
return;
|
||||
|
||||
|
||||
disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
|
||||
|
||||
spin_lock_irqsave(&msi_lock, flags);
|
||||
entry = msi_desc[dev->irq];
|
||||
entry = msi_desc[dev->first_msi_irq];
|
||||
if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
return;
|
||||
}
|
||||
if (irq_has_action(dev->irq)) {
|
||||
if (irq_has_action(dev->first_msi_irq)) {
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
|
||||
"free_irq() on MSI irq %d\n",
|
||||
pci_name(dev), dev->irq);
|
||||
BUG_ON(irq_has_action(dev->irq));
|
||||
pci_name(dev), dev->first_msi_irq);
|
||||
BUG_ON(irq_has_action(dev->first_msi_irq));
|
||||
} else {
|
||||
default_irq = entry->msi_attrib.default_irq;
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
msi_free_irq(dev, dev->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)
|
||||
@ -797,7 +772,7 @@ static int msi_free_irq(struct pci_dev* dev, int irq)
|
||||
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
|
||||
{
|
||||
int status, pos, nr_entries;
|
||||
int i, j, temp;
|
||||
int i, j;
|
||||
u16 control;
|
||||
|
||||
if (!entries || pci_msi_supported(dev) < 0)
|
||||
@ -825,16 +800,14 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
|
||||
return -EINVAL; /* duplicate entry */
|
||||
}
|
||||
}
|
||||
temp = dev->irq;
|
||||
WARN_ON(!msi_lookup_irq(dev, PCI_CAP_ID_MSIX));
|
||||
WARN_ON(!!dev->msix_enabled);
|
||||
|
||||
/* Check whether driver already requested for MSI irq */
|
||||
if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
|
||||
!msi_lookup_irq(dev, PCI_CAP_ID_MSI)) {
|
||||
dev->msi_enabled) {
|
||||
printk(KERN_INFO "PCI: %s: Can't enable MSI-X. "
|
||||
"Device already has an MSI irq assigned\n",
|
||||
pci_name(dev));
|
||||
dev->irq = temp;
|
||||
return -EINVAL;
|
||||
}
|
||||
status = msix_capability_init(dev, entries, nvec);
|
||||
@ -843,7 +816,9 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
|
||||
|
||||
void pci_disable_msix(struct pci_dev* dev)
|
||||
{
|
||||
int pos, temp;
|
||||
int irq, head, tail = 0, warning = 0;
|
||||
unsigned long flags;
|
||||
int pos;
|
||||
u16 control;
|
||||
|
||||
if (!pci_msi_enable)
|
||||
@ -851,6 +826,9 @@ void pci_disable_msix(struct pci_dev* dev)
|
||||
if (!dev)
|
||||
return;
|
||||
|
||||
if (!dev->msix_enabled)
|
||||
return;
|
||||
|
||||
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
||||
if (!pos)
|
||||
return;
|
||||
@ -861,31 +839,25 @@ void pci_disable_msix(struct pci_dev* dev)
|
||||
|
||||
disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
|
||||
|
||||
temp = dev->irq;
|
||||
if (!msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
|
||||
int irq, head, tail = 0, warning = 0;
|
||||
unsigned long flags;
|
||||
|
||||
irq = head = dev->irq;
|
||||
dev->irq = temp; /* Restore pin IRQ */
|
||||
while (head != tail) {
|
||||
spin_lock_irqsave(&msi_lock, flags);
|
||||
tail = msi_desc[irq]->link.tail;
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
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);
|
||||
}
|
||||
irq = head = dev->first_msi_irq;
|
||||
while (head != tail) {
|
||||
spin_lock_irqsave(&msi_lock, flags);
|
||||
tail = msi_desc[irq]->link.tail;
|
||||
spin_unlock_irqrestore(&msi_lock, flags);
|
||||
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;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -899,30 +871,28 @@ void pci_disable_msix(struct pci_dev* dev)
|
||||
**/
|
||||
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
|
||||
{
|
||||
int pos, temp;
|
||||
int pos;
|
||||
unsigned long flags;
|
||||
|
||||
if (!pci_msi_enable || !dev)
|
||||
return;
|
||||
|
||||
temp = dev->irq; /* Save IOAPIC IRQ */
|
||||
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
||||
if (pos > 0 && !msi_lookup_irq(dev, PCI_CAP_ID_MSI)) {
|
||||
if (irq_has_action(dev->irq)) {
|
||||
if (pos > 0 && 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->irq);
|
||||
BUG_ON(irq_has_action(dev->irq));
|
||||
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->irq);
|
||||
dev->irq = temp; /* Restore IOAPIC IRQ */
|
||||
msi_free_irq(dev, dev->first_msi_irq);
|
||||
}
|
||||
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
||||
if (pos > 0 && !msi_lookup_irq(dev, PCI_CAP_ID_MSIX)) {
|
||||
if (pos > 0 && dev->msix_enabled) {
|
||||
int irq, head, tail = 0, warning = 0;
|
||||
void __iomem *base = NULL;
|
||||
|
||||
irq = head = dev->irq;
|
||||
irq = head = dev->first_msi_irq;
|
||||
while (head != tail) {
|
||||
spin_lock_irqsave(&msi_lock, flags);
|
||||
tail = msi_desc[irq]->link.tail;
|
||||
@ -942,7 +912,6 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
|
||||
pci_name(dev));
|
||||
BUG_ON(warning > 0);
|
||||
}
|
||||
dev->irq = temp; /* Restore IOAPIC IRQ */
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -174,6 +174,9 @@ struct pci_dev {
|
||||
struct bin_attribute *rom_attr; /* attribute descriptor for sysfs ROM entry */
|
||||
int rom_attr_enabled; /* has display of the rom attribute been enabled? */
|
||||
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
|
||||
#ifdef CONFIG_PCI_MSI
|
||||
unsigned int first_msi_irq;
|
||||
#endif
|
||||
};
|
||||
|
||||
#define pci_dev_g(n) list_entry(n, struct pci_dev, global_list)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user