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[PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

Started byChristoph Hellwig <hch@lst.de>
First post2016-11-09 02:20 +0100
Last post2016-11-09 08:50 +0100
Articles 3 — 3 participants

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  [PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors() Christoph Hellwig <hch@lst.de> - 2016-11-09 02:20 +0100
    Re: [PATCH 2/7] genirq/affinity: Handle pre/post vectors in  irq_calc_affinity_vectors() Hannes Reinecke <hare@suse.de> - 2016-11-09 08:10 +0100
    [tip:irq/core] genirq/affinity: Handle pre/post vectors in  irq_calc_affinity_vectors() tip-bot for Christoph Hellwig <tipbot@zytor.com> - 2016-11-09 08:50 +0100

#1517707 — [PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

FromChristoph Hellwig <hch@lst.de>
Date2016-11-09 02:20 +0100
Subject[PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()
Message-ID<sBpIt-r4-9@gated-at.bofh.it>
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: Christoph Hellwig <hch@lst.de>
---
 drivers/pci/msi.c         |  8 ++++----
 include/linux/interrupt.h |  4 ++--
 kernel/irq/affinity.c     | 24 ++++++++++--------------
 3 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ad70507..dad2da7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1061,6 +1061,7 @@ EXPORT_SYMBOL(pci_msi_enabled);
 static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 		unsigned int flags)
 {
+	static const struct irq_affinity default_affd;
 	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int nvec;
 	int rc;
@@ -1091,8 +1092,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 
 	for (;;) {
 		if (affinity) {
-			nvec = irq_calc_affinity_vectors(dev->irq_affinity,
-					nvec);
+			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
@@ -1132,6 +1132,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
 		struct msix_entry *entries, int minvec, int maxvec,
 		unsigned int flags)
 {
+	static const struct irq_affinity default_affd;
 	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int rc, nvec = maxvec;
 
@@ -1140,8 +1141,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
 
 	for (;;) {
 		if (affinity) {
-			nvec = irq_calc_affinity_vectors(dev->irq_affinity,
-					nvec);
+			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 6b52686..9081f23b 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -291,7 +291,7 @@ 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);
-int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec);
+int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd);
 
 #else /* CONFIG_SMP */
 
@@ -331,7 +331,7 @@ irq_create_affinity_masks(const struct cpumask *affinity, int nvec)
 }
 
 static inline int
-irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
+irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
 {
 	return maxvec;
 }
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 17f51d63..8d92597 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -131,24 +131,20 @@ struct cpumask *irq_create_affinity_masks(const struct cpumask *affinity,
 }
 
 /**
- * irq_calc_affinity_vectors - Calculate to optimal number of vectors for a given affinity mask
- * @affinity:		The affinity mask to spread. If NULL cpu_online_mask
- *			is used
- * @maxvec:		The maximum number of vectors available
+ * irq_calc_affinity_vectors - Calculate the optimal number of vectors
+ * @maxvec:	The maximum number of vectors available
+ * @affd:	Description of the affinity requirements
  */
-int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
+int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
 {
-	int cpus, ret;
+	int resv = affd->pre_vectors + affd->post_vectors;
+	int vecs = maxvec - resv;
+	int cpus;
 
 	/* Stabilize the cpumasks */
 	get_online_cpus();
-	/* If the supplied affinity mask is NULL, use cpu online mask */
-	if (!affinity)
-		affinity = cpu_online_mask;
-
-	cpus = cpumask_weight(affinity);
-	ret = (cpus < maxvec) ? cpus : maxvec;
-
+	cpus = cpumask_weight(cpu_online_mask);
 	put_online_cpus();
-	return ret;
+
+	return min(cpus, vecs) + resv;
 }
-- 
2.1.4

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#1517795 — Re: [PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

FromHannes Reinecke <hare@suse.de>
Date2016-11-09 08:10 +0100
SubjectRe: [PATCH 2/7] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()
Message-ID<sBvbb-47b-5@gated-at.bofh.it>
In reply to#1517707
On 11/09/2016 02:15 AM, Christoph Hellwig wrote:
> 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: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/pci/msi.c         |  8 ++++----
>  include/linux/interrupt.h |  4 ++--
>  kernel/irq/affinity.c     | 24 ++++++++++--------------
>  3 files changed, 16 insertions(+), 20 deletions(-)
>
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@suse.de			               +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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#1517806 — [tip:irq/core] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

Fromtip-bot for Christoph Hellwig <tipbot@zytor.com>
Date2016-11-09 08:50 +0100
Subject[tip:irq/core] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()
Message-ID<sBvNT-4kA-7@gated-at.bofh.it>
In reply to#1517707
Commit-ID:  212bd846223c718b6577d4df16fd8d05a55ad914
Gitweb:     http://git.kernel.org/tip/212bd846223c718b6577d4df16fd8d05a55ad914
Author:     Christoph Hellwig <hch@lst.de>
AuthorDate: Tue, 8 Nov 2016 17:15:02 -0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 9 Nov 2016 08:25:08 +0100

genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors()

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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.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/1478654107-7384-3-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 drivers/pci/msi.c         |  8 ++++----
 include/linux/interrupt.h |  4 ++--
 kernel/irq/affinity.c     | 24 ++++++++++--------------
 3 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ad70507..dad2da7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1061,6 +1061,7 @@ EXPORT_SYMBOL(pci_msi_enabled);
 static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 		unsigned int flags)
 {
+	static const struct irq_affinity default_affd;
 	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int nvec;
 	int rc;
@@ -1091,8 +1092,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 
 	for (;;) {
 		if (affinity) {
-			nvec = irq_calc_affinity_vectors(dev->irq_affinity,
-					nvec);
+			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
@@ -1132,6 +1132,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
 		struct msix_entry *entries, int minvec, int maxvec,
 		unsigned int flags)
 {
+	static const struct irq_affinity default_affd;
 	bool affinity = flags & PCI_IRQ_AFFINITY;
 	int rc, nvec = maxvec;
 
@@ -1140,8 +1141,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
 
 	for (;;) {
 		if (affinity) {
-			nvec = irq_calc_affinity_vectors(dev->irq_affinity,
-					nvec);
+			nvec = irq_calc_affinity_vectors(nvec, &default_affd);
 			if (nvec < minvec)
 				return -ENOSPC;
 		}
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 6b52686..9081f23 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -291,7 +291,7 @@ 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);
-int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec);
+int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd);
 
 #else /* CONFIG_SMP */
 
@@ -331,7 +331,7 @@ irq_create_affinity_masks(const struct cpumask *affinity, int nvec)
 }
 
 static inline int
-irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
+irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
 {
 	return maxvec;
 }
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 17f51d63..8d92597 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -131,24 +131,20 @@ out:
 }
 
 /**
- * irq_calc_affinity_vectors - Calculate to optimal number of vectors for a given affinity mask
- * @affinity:		The affinity mask to spread. If NULL cpu_online_mask
- *			is used
- * @maxvec:		The maximum number of vectors available
+ * irq_calc_affinity_vectors - Calculate the optimal number of vectors
+ * @maxvec:	The maximum number of vectors available
+ * @affd:	Description of the affinity requirements
  */
-int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec)
+int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd)
 {
-	int cpus, ret;
+	int resv = affd->pre_vectors + affd->post_vectors;
+	int vecs = maxvec - resv;
+	int cpus;
 
 	/* Stabilize the cpumasks */
 	get_online_cpus();
-	/* If the supplied affinity mask is NULL, use cpu online mask */
-	if (!affinity)
-		affinity = cpu_online_mask;
-
-	cpus = cpumask_weight(affinity);
-	ret = (cpus < maxvec) ? cpus : maxvec;
-
+	cpus = cpumask_weight(cpu_online_mask);
 	put_online_cpus();
-	return ret;
+
+	return min(cpus, vecs) + resv;
 }

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