diff options
author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-11-15 14:24:07 (GMT) |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2014-11-23 12:01:47 (GMT) |
commit | 8e047adae969701c6cec136484bb9de8572af934 (patch) | |
tree | ad2b2fdb2bfefc9a629d37b6d3731b2acac8e1b6 /drivers/pci/msi.c | |
parent | 3878eaefb89aa841ae4c2150490cee864ac628cb (diff) | |
download | linux-8e047adae969701c6cec136484bb9de8572af934.tar.xz |
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: Jiang 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.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r-- | drivers/pci/msi.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 36b0c2e..4befe09 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -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 */ |