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genirq/msi: Add cpumask allocation to alloc_msi_entry

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For irq spreading want to store affinity masks in the msi_entry. Add the
infrastructure for it.

We allocate an array of cpumasks with an array size of the number of used
vectors in the entry, so we can hand in the information per linux interrupt
later.

As we hand in the number of used vectors, we assign them right
away. Convert all the call sites.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: axboe@fb.com
Cc: keith.busch@intel.com
Cc: agordeev@redhat.com
Cc: linux-block@vger.kernel.org
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/1473862739-15032-2-git-send-email-hch@lst.de
This commit is contained in:
Thomas Gleixner
2016-09-14 16:18:47 +02:00
parent 9395452b4a
commit 28f4b04143
5 changed files with 31 additions and 12 deletions
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5
include/linux/msi.h
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@@ -68,7 +68,7 @@ struct msi_desc {
unsigned int nvec_used;
struct device *dev;
struct msi_msg msg;
const struct cpumask *affinity;
struct cpumask *affinity;
union {
/* PCI MSI/X specific data */
@@ -123,7 +123,8 @@ static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
}
#endif /* CONFIG_PCI_MSI */
struct msi_desc *alloc_msi_entry(struct device *dev);
struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
const struct cpumask *affinity);
void free_msi_entry(struct msi_desc *entry);
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);