Re: [PATCH 3/7] genirq/affinity: Handle pre/post vectors in irq_create_affinity_masks()

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On 11/07/2016 07:47 PM, Christoph Hellwig wrote:
From: Christogh Hellwig <hch@xxxxxx>

Only calculate the affinity for the main I/O vectors, and skip the
pre or post vectors specified by struct irq_affinity.

Also remove the irq_affinity cpumask argument that has never been used.
If we ever need it in the future we can pass it through struct
irq_affinity.

Signed-off-by: Christogh Hellwig <hch@xxxxxx>
---
 drivers/pci/msi.c         |  4 ++--
 include/linux/interrupt.h |  4 ++--
 kernel/irq/affinity.c     | 46 +++++++++++++++++++++++++---------------------
 3 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index c58d3c2..1761b8a 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -558,7 +558,7 @@ msi_setup_entry(struct pci_dev *dev, int nvec, bool affinity)
 	u16 control;

 	if (affinity) {
-		masks = irq_create_affinity_masks(dev->irq_affinity, nvec);
+		masks = irq_create_affinity_masks(nvec, NULL);
 		if (!masks)
 			pr_err("Unable to allocate affinity masks, ignoring\n");
 	}
@@ -697,7 +697,7 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
 	int ret, i;

 	if (affinity) {
-		masks = irq_create_affinity_masks(dev->irq_affinity, nvec);
+		masks = irq_create_affinity_masks(nvec, NULL);
 		if (!masks)
 			pr_err("Unable to allocate affinity masks, ignoring\n");
 	}
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 092adfb..bca8f1c 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -290,7 +290,7 @@ extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
 extern int
 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);

-struct cpumask *irq_create_affinity_masks(const struct cpumask *affinity, int nvec);
+struct cpumask *irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
 int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd);

 #else /* CONFIG_SMP */
@@ -325,7 +325,7 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
 }

 static inline struct cpumask *
-irq_create_affinity_masks(const struct cpumask *affinity, int nvec)
+irq_create_affinity_masks(int nvec, const struct irq_affinity *affd)
 {
 	return NULL;
 }
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 8d92597..17360bd 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -51,16 +51,16 @@ static int get_nodes_in_cpumask(const struct cpumask *mask, nodemask_t *nodemsk)

 /**
  * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
- * @affinity:		The affinity mask to spread. If NULL cpu_online_mask
- *			is used
- * @nvecs:		The number of vectors
+ * @nvecs:	The total number of vectors
+ * @affd:	Description of the affinity requirements
  *
  * Returns the masks pointer or NULL if allocation failed.
  */
-struct cpumask *irq_create_affinity_masks(const struct cpumask *affinity,
-					  int nvec)
+struct cpumask *
+irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
 {
-	int n, nodes, vecs_per_node, cpus_per_vec, extra_vecs, curvec = 0;
+	int n, nodes, vecs_per_node, cpus_per_vec, extra_vecs, curvec;
+	int affv = nvecs - affd->pre_vectors - affd->post_vectors;
 	nodemask_t nodemsk = NODE_MASK_NONE;
 	struct cpumask *masks;
 	cpumask_var_t nmsk;
Check for NULL affd?

Cheers,

Hannes
--
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@xxxxxxx			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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