Commit 8e047ada authored by Jiang Liu's avatar Jiang Liu Committed by Thomas Gleixner

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

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: default avatarJiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/1416061447-9472-10-git-send-email-jiang.liu@linux.intel.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3878eaef
...@@ -28,6 +28,40 @@ int pci_msi_ignore_mask; ...@@ -28,6 +28,40 @@ int pci_msi_ignore_mask;
#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) #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 */ /* Arch hooks */
...@@ -348,7 +382,7 @@ static void free_msi_irqs(struct pci_dev *dev) ...@@ -348,7 +382,7 @@ static void free_msi_irqs(struct pci_dev *dev)
for (i = 0; i < entry->nvec_used; i++) for (i = 0; i < entry->nvec_used; i++)
BUG_ON(irq_has_action(entry->irq + 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) { list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
if (entry->msi_attrib.is_msix) { if (entry->msi_attrib.is_msix) {
...@@ -600,7 +634,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) ...@@ -600,7 +634,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
list_add_tail(&entry->list, &dev->msi_list); list_add_tail(&entry->list, &dev->msi_list);
/* Configure MSI capability structure */ /* 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) { if (ret) {
msi_mask_irq(entry, mask, ~mask); msi_mask_irq(entry, mask, ~mask);
free_msi_irqs(dev); free_msi_irqs(dev);
...@@ -715,7 +749,7 @@ static int msix_capability_init(struct pci_dev *dev, ...@@ -715,7 +749,7 @@ static int msix_capability_init(struct pci_dev *dev,
if (ret) if (ret)
return 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) if (ret)
goto out_avail; goto out_avail;
...@@ -1258,4 +1292,31 @@ void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev) ...@@ -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); 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 */ #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
...@@ -228,6 +228,9 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node, ...@@ -228,6 +228,9 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev, int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
int nvec, int type); int nvec, int type);
void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev); void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
struct msi_domain_info *info, struct irq_domain *parent);
irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev, irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
struct msi_desc *desc); struct msi_desc *desc);
int pci_msi_domain_check_cap(struct irq_domain *domain, int pci_msi_domain_check_cap(struct irq_domain *domain,
......
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