xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

genirq/msi: Switch to new irq spreading infrastructure

Browse Source 
Switch MSI over to the new spreading code. If a pci device contains a valid
pointer to a cpumask, then this mask is used for spreading otherwise the
online cpu mask is used. This allows a driver to restrict the spread to a
subset of CPUs, e.g. cpus on a particular node.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: axboe@fb.com
Cc: keith.busch@intel.com
Cc: agordeev@redhat.com
Cc: linux-block@vger.kernel.org
Link: http://lkml.kernel.org/r/1473862739-15032-4-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2016-09-14 16:18:49 +02:00
parent 34c3d9819f
commit e75eafb9b0
2 changed files with 86 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
kernel/irq/irqdesc.c
View File

@@ -236,25 +236,24 @@ static int alloc_descs(unsigned int start, unsigned int cnt, int node,
const struct cpumask *mask = NULL;
struct irq_desc *desc;
unsigned int flags;
int i, cpu = -1;
int i;
if (affinity && cpumask_empty(affinity))
return -EINVAL;
/* Validate affinity mask(s) */
if (affinity) {
for (i = 0, mask = affinity; i < cnt; i++, mask++) {
if (cpumask_empty(mask))
return -EINVAL;
}
}
flags = affinity ? IRQD_AFFINITY_MANAGED : 0;
mask = NULL;
for (i = 0; i < cnt; i++) {
if (affinity) {
cpu = cpumask_next(cpu, affinity);
if (cpu >= nr_cpu_ids)
cpu = cpumask_first(affinity);
node = cpu_to_node(cpu);
/*
* For single allocations we use the caller provided
* mask otherwise we use the mask of the target cpu
*/
mask = cnt == 1 ? affinity : cpumask_of(cpu);
node = cpu_to_node(cpumask_first(affinity));
mask = affinity;
affinity++;
}
desc = alloc_desc(start + i, node, flags, mask, owner);
if (!desc)
@@ -481,9 +480,9 @@ EXPORT_SYMBOL_GPL(irq_free_descs);
* @cnt: Number of consecutive irqs to allocate.
* @node: Preferred node on which the irq descriptor should be allocated
* @owner: Owning module (can be NULL)
* @affinity: Optional pointer to an affinity mask which hints where the
* irq descriptors should be allocated and which default
* affinities to use
* @affinity: Optional pointer to an affinity mask array of size @cnt which
* hints where the irq descriptors should be allocated and which
* default affinities to use
*
* Returns the first irq number or error code
*/