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MSI: Give archs the option to free all MSI/Xs at once. 

This patch introduces an optional function, arch_teardown_msi_irqs(),
which gives an arch the opportunity to do per-device teardown for
MSI/X. If that's not required, the default version simply calls
arch_teardown_msi_irq() for each msi irq required.

arch_teardown_msi_irqs() is simply passed a pdev, attached to the pdev
is a list of msi_descs, it is up to the arch to free the irq associated
with each of these as appropriate.

For archs that _don't_ implement arch_teardown_msi_irqs(), all msi_descs
with irq == 0 are considered unallocated, and the arch teardown routine
is not called on them.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Michael Ellerman 2007-04-18 19:39:22 +10:00 committed by Greg Kroah-Hartman
parent 9c8313343c
commit 032de8e2fe
2 changed files with 40 additions and 36 deletions
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75
drivers/pci/msi.c
View File

@ -207,7 +207,7 @@ void unmask_msi_irq(unsigned int irq)
msix_flush_writes(irq);
}
static int msi_free_irq(struct pci_dev* dev, int irq);
static int msi_free_irqs(struct pci_dev* dev);
static struct msi_desc* alloc_msi_entry(void)
@ -339,8 +339,7 @@ static int msi_capability_init(struct pci_dev *dev)
/* Configure MSI capability structure */
ret = arch_setup_msi_irqs(dev, 1, PCI_CAP_ID_MSI);
if (ret) {
list_del(&entry->list);
kfree(entry);
msi_free_irqs(dev);
return ret;
}
@ -415,10 +414,11 @@ static int msix_capability_init(struct pci_dev *dev,
list_for_each_entry(entry, &dev->msi_list, list) {
if (entry->irq != 0) {
avail++;
msi_free_irq(dev, entry->irq);
}
}
msi_free_irqs(dev);
/* If we had some success report the number of irqs
* we succeeded in setting up.
*/
@ -539,39 +539,33 @@ void pci_disable_msi(struct pci_dev* dev)
}
default_irq = entry->msi_attrib.default_irq;
msi_free_irq(dev, entry->irq);
msi_free_irqs(dev);
/* Restore dev->irq to its default pin-assertion irq */
dev->irq = default_irq;
}
EXPORT_SYMBOL(pci_disable_msi);
static int msi_free_irq(struct pci_dev* dev, int irq)
static int msi_free_irqs(struct pci_dev* dev)
{
struct msi_desc *entry;
int entry_nr, type;
void __iomem *base;
struct msi_desc *entry, *tmp;
BUG_ON(irq_has_action(irq));
list_for_each_entry(entry, &dev->msi_list, list)
BUG_ON(irq_has_action(entry->irq));
entry = get_irq_msi(irq);
if (!entry || entry->dev != dev) {
return -EINVAL;
}
type = entry->msi_attrib.type;
entry_nr = entry->msi_attrib.entry_nr;
base = entry->mask_base;
list_del(&entry->list);
arch_teardown_msi_irqs(dev);
arch_teardown_msi_irq(irq);
kfree(entry);
list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
if (entry->msi_attrib.type == PCI_CAP_ID_MSIX) {
if (list_is_last(&entry->list, &dev->msi_list))
iounmap(entry->mask_base);
if (type == PCI_CAP_ID_MSIX) {
writel(1, base + entry_nr * PCI_MSIX_ENTRY_SIZE +
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
if (list_empty(&dev->msi_list))
iounmap(base);
writel(1, entry->mask_base + entry->msi_attrib.entry_nr
* PCI_MSIX_ENTRY_SIZE
+ PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
}
list_del(&entry->list);
kfree(entry);
}
return 0;
@ -636,10 +630,7 @@ EXPORT_SYMBOL(pci_enable_msix);
static void msix_free_all_irqs(struct pci_dev *dev)
{
struct msi_desc *entry;
list_for_each_entry(entry, &dev->msi_list, list)
msi_free_irq(dev, entry->irq);
msi_free_irqs(dev);
}
void pci_disable_msix(struct pci_dev* dev)
@ -669,12 +660,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
if (!pci_msi_enable || !dev)
return;
if (dev->msi_enabled) {
struct msi_desc *entry;
BUG_ON(list_empty(&dev->msi_list));
entry = list_entry(dev->msi_list.next, struct msi_desc, list);
msi_free_irq(dev, entry->irq);
}
if (dev->msi_enabled)
msi_free_irqs(dev);
if (dev->msix_enabled)
msix_free_all_irqs(dev);
@ -719,3 +706,19 @@ arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
return 0;
}
void __attribute__ ((weak)) arch_teardown_msi_irq(unsigned int irq)
{
return;
}
void __attribute__ ((weak))
arch_teardown_msi_irqs(struct pci_dev *dev)
{
struct msi_desc *entry;
list_for_each_entry(entry, &dev->msi_list, list) {
if (entry->irq != 0)
arch_teardown_msi_irq(entry->irq);
}
}

1
include/linux/msi.h
View File

@ -42,6 +42,7 @@ struct msi_desc {
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
extern void arch_teardown_msi_irqs(struct pci_dev *dev);
extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);