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Subject[tip:irq/core] genirq/msi: Make use of affinity aware allocations
Commit-ID:  0972fa57f53525ffa6ced12d703750fc2791e3ce
Gitweb: http://git.kernel.org/tip/0972fa57f53525ffa6ced12d703750fc2791e3ce
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 4 Jul 2016 17:39:26 +0900
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 4 Jul 2016 12:25:14 +0200

genirq/msi: Make use of affinity aware allocations

Allow the MSI code to provide affinity hints per MSI descriptor.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: linux-block@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Cc: axboe@fb.com
Cc: agordeev@redhat.com
Link: http://lkml.kernel.org/r/1467621574-8277-6-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
include/linux/msi.h | 2 ++
kernel/irq/msi.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/msi.h b/include/linux/msi.h
index c33abfa..4f0bfe5 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -47,6 +47,7 @@ struct fsl_mc_msi_desc {
* @nvec_used: The number of vectors used
* @dev: Pointer to the device which uses this descriptor
* @msg: The last set MSI message cached for reuse
+ * @affinity: Optional pointer to a cpu affinity mask for this descriptor
*
* @masked: [PCI MSI/X] Mask bits
* @is_msix: [PCI MSI/X] True if MSI-X
@@ -67,6 +68,7 @@ struct msi_desc {
unsigned int nvec_used;
struct device *dev;
struct msi_msg msg;
+ const struct cpumask *affinity;

union {
/* PCI MSI/X specific data */
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 58dbbac..0e2a736 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -335,7 +335,7 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,

virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
dev_to_node(dev), &arg, false,
- NULL);
+ desc->affinity);
if (virq < 0) {
ret = -ENOSPC;
if (ops->handle_error)
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