[PATCH 05/13] pci/msi: Retrieve affinity for a vector
flat view
STALE3668d
From: Christoph Hellwig <hch@lst.de>
Date: 2016-09-14 14:19:28
Also in:
lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
From: Thomas Gleixner <redacted> Add a helper to get the affinity mask for a given PCI irq vector. For MSI or MSI-X vectors these are stored by the IRQ core, while for legacy interrupts we will always return cpu_possible_map. Signed-off-by: Thomas Gleixner <redacted> [hch: updated to follow the style of pci_irq_vector()] Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/pci/msi.c | 31 +++++++++++++++++++++++++++++++ include/linux/pci.h | 6 ++++++ 2 files changed, 37 insertions(+)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 06100dd..9da5ecb 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c@@ -1270,6 +1270,37 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr) } EXPORT_SYMBOL(pci_irq_vector); +/** + * pci_irq_get_affinity - return the affinity of a particular msi vector + * @dev: PCI device to operate on + * @nr: device-relative interrupt vector index (0-based). + */ +const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) +{ + if (dev->msix_enabled) { + struct msi_desc *entry; + int i = 0; + + for_each_pci_msi_entry(entry, dev) { + if (i == nr) + return entry->affinity; + i++; + } + WARN_ON_ONCE(1); + return NULL; + } else if (dev->msi_enabled) { + struct msi_desc *entry = first_pci_msi_entry(dev); + + if (WARN_ON_ONCE(!entry || nr >= entry->nvec_used)) + return NULL; + + return &entry->affinity[nr]; + } else { + return cpu_possible_mask; + } +} +EXPORT_SYMBOL(pci_irq_get_affinity); + struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc) { return to_pci_dev(desc->dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0ab8359..3b0a800 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -1300,6 +1300,7 @@ int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, unsigned int max_vecs, unsigned int flags); void pci_free_irq_vectors(struct pci_dev *dev); int pci_irq_vector(struct pci_dev *dev, unsigned int nr); +const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec); #else static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
@@ -1342,6 +1343,11 @@ static inline int pci_irq_vector(struct pci_dev *dev, unsigned int nr) return -EINVAL; return dev->irq; } +static inline const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, + int vec) +{ + return cpu_possible_mask; +} #endif #ifdef CONFIG_PCIEPORTBUS
--
2.1.4