genirq/affinity: Introduce struct irq_affinity

Some drivers (various network and RDMA adapter for example) have a MSI-X
vector layout where most of the vectors are used for I/O queues and should
have CPU affinity assigned to them, but some (usually 1 but sometimes more)
at the beginning or end are used for low-performance admin or configuration
work and should not have any explicit affinity assigned to them.

Add a new irq_affinity structure, which will be passed through a variant of
pci_irq_alloc_vectors that allows to specify these requirements (and is
extensible to any future quirks in that area) so that the core IRQ affinity
algorithm can take this quirks into account.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.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/1478654107-7384-2-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 72f0721f75e734ae88d4b3f84272a7a552fb0a4f..6b5268688a81a64b628cea5e50777f0ca7b96b03 100644 (file)
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -232,6 +232,18 @@ struct irq_affinity_notify {
        void (*release)(struct kref *ref);
 };
 
+/**
+ * struct irq_affinity - Description for automatic irq affinity assignements
+ * @pre_vectors:       Don't apply affinity to @pre_vectors at beginning of
+ *                     the MSI(-X) vector space
+ * @post_vectors:      Don't apply affinity to @post_vectors at end of
+ *                     the MSI(-X) vector space
+ */
+struct irq_affinity {
+       int     pre_vectors;
+       int     post_vectors;
+};
+
 #if defined(CONFIG_SMP)
 
 extern cpumask_var_t irq_default_affinity;