pci/msi: Retrieve affinity for a vector

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.

[hch: updated to follow the style of pci_irq_vector()]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: axboe@fb.com
Cc: keith.busch@intel.com
Cc: agordeev@redhat.com
Cc: linux-block@vger.kernel.org
Link: http://lkml.kernel.org/r/1473862739-15032-6-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 06100dd..9da5ecb 100644 (file)
--- 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 (file)
--- 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