PCI/MSI: Propagate IRQ affinity description through the MSI code

No API change yet, just pass it down all the way from
pci_alloc_irq_vectors() to the core MSI code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Link: http://lkml.kernel.org/r/1478654107-7384-5-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/pci/msi.c

@@ -551,15 +551,14 @@ error_attrs:
 }
 
 static struct msi_desc *
-msi_setup_entry(struct pci_dev *dev, int nvec, bool affinity)
+msi_setup_entry(struct pci_dev *dev, int nvec, const struct irq_affinity *affd)
 {
-	static const struct irq_affinity default_affd;
 	struct cpumask *masks = NULL;
 	struct msi_desc *entry;
 	u16 control;
 
-	if (affinity) {
-		masks = irq_create_affinity_masks(nvec, &default_affd);
+	if (affd) {
+		masks = irq_create_affinity_masks(nvec, affd);
 		if (!masks)
 			pr_err("Unable to allocate affinity masks, ignoring\n");
 	}
@@ -619,7 +618,8 @@ static int msi_verify_entries(struct pci_dev *dev)
  * an error, and a positive return value indicates the number of interrupts
  * which could have been allocated.
  */
-static int msi_capability_init(struct pci_dev *dev, int nvec, bool affinity)
+static int msi_capability_init(struct pci_dev *dev, int nvec,
+			       const struct irq_affinity *affd)
 {
 	struct msi_desc *entry;
 	int ret;
@@ -627,7 +627,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, bool affinity)
 
 	pci_msi_set_enable(dev, 0);	/* Disable MSI during set up */
 
-	entry = msi_setup_entry(dev, nvec, affinity);
+	entry = msi_setup_entry(dev, nvec, affd);
 	if (!entry)
 		return -ENOMEM;
 
@@ -691,15 +691,14 @@ static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
 
 static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
 			      struct msix_entry *entries, int nvec,
-			      bool affinity)
+			      const struct irq_affinity *affd)
 {
-	static const struct irq_affinity default_affd;
 	struct cpumask *curmsk, *masks = NULL;
 	struct msi_desc *entry;
 	int ret, i;
 
-	if (affinity) {
-		masks = irq_create_affinity_masks(nvec, &default_affd);
+	if (affd) {
+		masks = irq_create_affinity_masks(nvec, affd);
 		if (!masks)
 			pr_err("Unable to allocate affinity masks, ignoring\n");
 	}
@@ -755,14 +754,14 @@ static void msix_program_entries(struct pci_dev *dev,
  * @dev: pointer to the pci_dev data structure of MSI-X device function
  * @entries: pointer to an array of struct msix_entry entries
  * @nvec: number of @entries
- * @affinity: flag to indicate cpu irq affinity mask should be set
+ * @affd: Optional pointer to enable automatic affinity assignement
  *
  * Setup the MSI-X capability structure of device function with a
  * single MSI-X irq. A return of zero indicates the successful setup of
  * requested MSI-X entries with allocated irqs or non-zero for otherwise.
  **/
 static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
-				int nvec, bool affinity)
+				int nvec, const struct irq_affinity *affd)
 {
 	int ret;
 	u16 control;
@@ -777,7 +776,7 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
 	if (!base)
 		return -ENOMEM;
 
-	ret = msix_setup_entries(dev, base, entries, nvec, affinity);
+	ret = msix_setup_entries(dev, base, entries, nvec, affd);
 	if (ret)
 		return ret;
 
@@ -958,7 +957,7 @@ int pci_msix_vec_count(struct pci_dev *dev)
 EXPORT_SYMBOL(pci_msix_vec_count);
 
 static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
-			     int nvec, bool affinity)
+			     int nvec, const struct irq_affinity *affd)
 {
 	int nr_entries;
 	int i, j;
@@ -990,7 +989,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
 		dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
 		return -EINVAL;
 	}
-	return msix_capability_init(dev, entries, nvec, affinity);
+	return msix_capability_init(dev, entries, nvec, affd);
 }
 
 /**
@@ -1010,7 +1009,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
  **/
 int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
 {
-	return __pci_enable_msix(dev, entries, nvec, false);
+	return __pci_enable_msix(dev, entries, nvec, NULL);
 }
 EXPORT_SYMBOL(pci_enable_msix);
 
@@ -1061,10 +1060,8 @@ int pci_msi_enabled(void)
 EXPORT_SYMBOL(pci_msi_enabled);
 
 static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
-		unsigned int flags)
+				  const struct irq_affinity *affd)
 {
-	static const struct irq_affinity default_affd;
-	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int nvec;
 	int rc;
 
@@ -1093,13 +1090,13 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 		nvec = maxvec;
 
 	for (;;) {
-		if (affinity) {
-			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
+		if (affd) {
+			nvec = irq_calc_affinity_vectors(nvec, affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
 
-		rc = msi_capability_init(dev, nvec, affinity);
+		rc = msi_capability_init(dev, nvec, affd);
 		if (rc == 0)
 			return nvec;
 
@@ -1126,29 +1123,27 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
  **/
 int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
 {
-	return __pci_enable_msi_range(dev, minvec, maxvec, 0);
+	return __pci_enable_msi_range(dev, minvec, maxvec, NULL);
 }
 EXPORT_SYMBOL(pci_enable_msi_range);
 
 static int __pci_enable_msix_range(struct pci_dev *dev,
-		struct msix_entry *entries, int minvec, int maxvec,
-		unsigned int flags)
+				   struct msix_entry *entries, int minvec,
+				   int maxvec, const struct irq_affinity *affd)
 {
-	static const struct irq_affinity default_affd;
-	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int rc, nvec = maxvec;
 
 	if (maxvec < minvec)
 		return -ERANGE;
 
 	for (;;) {
-		if (affinity) {
-			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
+		if (affd) {
+			nvec = irq_calc_affinity_vectors(nvec, affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
 
-		rc = __pci_enable_msix(dev, entries, nvec, affinity);
+		rc = __pci_enable_msix(dev, entries, nvec, affd);
 		if (rc == 0)
 			return nvec;
 
@@ -1179,7 +1174,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
 int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
 		int minvec, int maxvec)
 {
-	return __pci_enable_msix_range(dev, entries, minvec, maxvec, 0);
+	return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL);
 }
 EXPORT_SYMBOL(pci_enable_msix_range);
 
@@ -1203,17 +1198,22 @@ EXPORT_SYMBOL(pci_enable_msix_range);
 int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
 		unsigned int max_vecs, unsigned int flags)
 {
+	static const struct irq_affinity msi_default_affd;
+	const struct irq_affinity *affd = NULL;
 	int vecs = -ENOSPC;
 
+	if (flags & PCI_IRQ_AFFINITY)
+		affd = &msi_default_affd;
+
 	if (flags & PCI_IRQ_MSIX) {
 		vecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
-				flags);
+				affd);
 		if (vecs > 0)
 			return vecs;
 	}
 
 	if (flags & PCI_IRQ_MSI) {
-		vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, flags);
+		vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
 		if (vecs > 0)
 			return vecs;
 	}