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PCI/MSI: Provide mechanism to alloc/free MSI/MSIX interrupt from irqdomain

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Provide mechanism to directly alloc/free MSI/MSIX interrupt from
irqdomain, which will be used to replace arch_setup_msi_irq()/
arch_setup_msi_irqs()/arch_teardown_msi_irq()/arch_teardown_msi_irqs().

To kill weak functions, this patch introduce a new weak function
arch_get_pci_msi_domain(), which is to retrieve the MSI irqdomain
for a PCI device. This weak function could be killed once we get
a common way to associate MSI domain with PCI device.

Signed-off-by: Jiang Liu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: Bjorn Helgaas <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Yijing Wang <[email protected]>
Cc: Yingjoe Chen <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Matthias Brugger <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jiang Liu 2014-11-15 22:24:07 +08:00 • committed by Thomas Gleixner
commit 8e047adae9
2 changed files with 67 additions and 3 deletions
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67
drivers/pci/msi.c
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@ -28,6 +28,40 @@ int pci_msi_ignore_mask;
#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
static struct irq_domain *pci_msi_default_domain;
static DEFINE_MUTEX(pci_msi_domain_lock);
struct irq_domain * __weak arch_get_pci_msi_domain(struct pci_dev *dev)
{
return pci_msi_default_domain;
}
static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct irq_domain *domain;
domain = arch_get_pci_msi_domain(dev);
if (domain)
return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
return arch_setup_msi_irqs(dev, nvec, type);
}
static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
{
struct irq_domain *domain;
domain = arch_get_pci_msi_domain(dev);
if (domain)
pci_msi_domain_free_irqs(domain, 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
/* Arch hooks */
@ -348,7 +382,7 @@ static void free_msi_irqs(struct pci_dev *dev)
for (i = 0; i < entry->nvec_used; i++)
BUG_ON(irq_has_action(entry->irq + i));
arch_teardown_msi_irqs(dev);
pci_msi_teardown_msi_irqs(dev);
list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
if (entry->msi_attrib.is_msix) {
@ -600,7 +634,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
list_add_tail(&entry->list, &dev->msi_list);
/* Configure MSI capability structure */
ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
if (ret) {
msi_mask_irq(entry, mask, ~mask);
free_msi_irqs(dev);
@ -715,7 +749,7 @@ static int msix_capability_init(struct pci_dev *dev,
if (ret)
return ret;
ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
if (ret)
goto out_avail;
@ -1258,4 +1292,31 @@ void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
{
msi_domain_free_irqs(domain, &dev->dev);
}
/**
* pci_msi_create_default_irq_domain - Create a default MSI interrupt domain
* @node: Optional device-tree node of the interrupt controller
* @info: MSI domain info
* @parent: Parent irq domain
*
* Returns: A domain pointer or NULL in case of failure. If successful
* the default PCI/MSI irqdomain pointer is updated.
*/
struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
struct msi_domain_info *info, struct irq_domain *parent)
{
struct irq_domain *domain;
mutex_lock(&pci_msi_domain_lock);
if (pci_msi_default_domain) {
pr_err("PCI: default irq domain for PCI MSI has already been created.\n");
domain = NULL;
} else {
domain = pci_msi_create_irq_domain(node, info, parent);
pci_msi_default_domain = domain;
}
mutex_unlock(&pci_msi_domain_lock);
return domain;
}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */