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genirq/affinity: Don't pass irq_affinity_desc array to irq_build_affinity_masks

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Prepare for abstracting irq_build_affinity_masks() into a public function
for assigning all CPUs evenly into several groups.

Don't pass irq_affinity_desc array to irq_build_affinity_masks, instead
return a cpumask array by storing each assigned group into one element of
the array.

This allows to provide a generic interface for grouping all CPUs evenly
from a NUMA and CPU locality viewpoint, and the cost is one extra allocation
in irq_build_affinity_masks(), which should be fine since it is done via
GFP_KERNEL and irq_build_affinity_masks() is a slow path anyway.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>                                                                                                                                                                                                    
Link: https://lore.kernel.org/r/20221227022905.352674-4-ming.lei@redhat.com
This commit is contained in:
Ming Lei 2022-12-27 10:29:02 +08:00 committed by Thomas Gleixner
parent 1f962d91a1
commit e7bdd7f0cb
1 changed files with 24 additions and 10 deletions
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34
kernel/irq/affinity.c
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@ -249,7 +249,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
cpumask_var_t *node_to_cpumask,
const struct cpumask *cpu_mask,
struct cpumask *nmsk,
struct irq_affinity_desc *masks)
struct cpumask *masks)
{
unsigned int i, n, nodes, cpus_per_vec, extra_vecs, done = 0;
unsigned int last_affv = numvecs;
@ -270,7 +270,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
for_each_node_mask(n, nodemsk) {
/* Ensure that only CPUs which are in both masks are set */
cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
cpumask_or(&masks[curvec].mask, &masks[curvec].mask, nmsk);
cpumask_or(&masks[curvec], &masks[curvec], nmsk);
if (++curvec == last_affv)
curvec = 0;
}
@ -321,7 +321,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
*/
if (curvec >= last_affv)
curvec = 0;
irq_spread_init_one(&masks[curvec].mask, nmsk,
irq_spread_init_one(&masks[curvec], nmsk,
cpus_per_vec);
}
done += nv->nvectors;
@ -335,16 +335,16 @@ static int __irq_build_affinity_masks(unsigned int startvec,
* 1) spread present CPU on these vectors
* 2) spread other possible CPUs on these vectors
*/
static int irq_build_affinity_masks(unsigned int numvecs,
struct irq_affinity_desc *masks)
static struct cpumask *irq_build_affinity_masks(unsigned int numvecs)
{
unsigned int curvec = 0, nr_present = 0, nr_others = 0;
cpumask_var_t *node_to_cpumask;
cpumask_var_t nmsk, npresmsk;
int ret = -ENOMEM;
struct cpumask *masks = NULL;
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
return ret;
return NULL;
if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
goto fail_nmsk;
@ -353,6 +353,10 @@ static int irq_build_affinity_masks(unsigned int numvecs,
if (!node_to_cpumask)
goto fail_npresmsk;
masks = kcalloc(numvecs, sizeof(*masks), GFP_KERNEL);
if (!masks)
goto fail_node_to_cpumask;
/* Stabilize the cpumasks */
cpus_read_lock();
build_node_to_cpumask(node_to_cpumask);
@ -386,6 +390,7 @@ static int irq_build_affinity_masks(unsigned int numvecs,
if (ret >= 0)
WARN_ON(nr_present + nr_others < numvecs);
fail_node_to_cpumask:
free_node_to_cpumask(node_to_cpumask);
fail_npresmsk:
@ -393,7 +398,11 @@ static int irq_build_affinity_masks(unsigned int numvecs,
fail_nmsk:
free_cpumask_var(nmsk);
return ret < 0 ? ret : 0;
if (ret < 0) {
kfree(masks);
return NULL;
}
return masks;
}
static void default_calc_sets(struct irq_affinity *affd, unsigned int affvecs)
@ -457,13 +466,18 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
*/
for (i = 0, usedvecs = 0; i < affd->nr_sets; i++) {
unsigned int this_vecs = affd->set_size[i];
int ret;
int j;
struct cpumask *result = irq_build_affinity_masks(this_vecs);
ret = irq_build_affinity_masks(this_vecs, &masks[curvec]);
if (ret) {
if (!result) {
kfree(masks);
return NULL;
}
for (j = 0; j < this_vecs; j++)
cpumask_copy(&masks[curvec + j].mask, &result[j]);
kfree(result);
curvec += this_vecs;
usedvecs += this_vecs;
}