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genirq/affinity: Move two stage affinity spreading into a helper function 

No functional change. Prepares for supporting allocating and affinitizing
interrupt sets.

[ tglx: Minor changelog tweaks ]

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Cc: Hannes Reinecke <hare@suse.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Link: https://lkml.kernel.org/r/20181102145951.31979-3-ming.lei@redhat.com
This commit is contained in:
Ming Lei 2018-11-02 22:59:49 +08:00 committed by Thomas Gleixner
parent b825921990
commit 5c903e108d
1 changed files with 56 additions and 36 deletions
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92
kernel/irq/affinity.c
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@ -94,7 +94,7 @@ static int get_nodes_in_cpumask(cpumask_var_t *node_to_cpumask,
return nodes;
}
static int irq_build_affinity_masks(const struct irq_affinity *affd,
static int __irq_build_affinity_masks(const struct irq_affinity *affd,
int startvec, int numvecs,
cpumask_var_t *node_to_cpumask,
const struct cpumask *cpu_mask,
@ -165,6 +165,58 @@ out:
return done;
}
/*
* build affinity in two stages:
* 1) spread present CPU on these vectors
* 2) spread other possible CPUs on these vectors
*/
static int irq_build_affinity_masks(const struct irq_affinity *affd,
int startvec, int numvecs,
cpumask_var_t *node_to_cpumask,
struct cpumask *masks)
{
int curvec = startvec, usedvecs = -1;
cpumask_var_t nmsk, npresmsk;
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
return usedvecs;
if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
goto fail;
/* Stabilize the cpumasks */
get_online_cpus();
build_node_to_cpumask(node_to_cpumask);
/* Spread on present CPUs starting from affd->pre_vectors */
usedvecs = __irq_build_affinity_masks(affd, curvec, numvecs,
node_to_cpumask, cpu_present_mask,
nmsk, masks);
/*
* Spread on non present CPUs starting from the next vector to be
* handled. If the spreading of present CPUs already exhausted the
* vector space, assign the non present CPUs to the already spread
* out vectors.
*/
if (usedvecs >= numvecs)
curvec = affd->pre_vectors;
else
curvec = affd->pre_vectors + usedvecs;
cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
usedvecs += __irq_build_affinity_masks(affd, curvec, numvecs,
node_to_cpumask, npresmsk,
nmsk, masks);
put_online_cpus();
free_cpumask_var(npresmsk);
fail:
free_cpumask_var(nmsk);
return usedvecs;
}
/**
* irq_create_affinity_masks - Create affinity masks for multiqueue spreading
* @nvecs: The total number of vectors
@ -177,7 +229,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
{
int affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
int curvec, usedvecs;
cpumask_var_t nmsk, npresmsk, *node_to_cpumask;
cpumask_var_t *node_to_cpumask;
struct cpumask *masks = NULL;
/*
@ -187,15 +239,9 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
if (nvecs == affd->pre_vectors + affd->post_vectors)
return NULL;
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
return NULL;
if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
goto outcpumsk;
node_to_cpumask = alloc_node_to_cpumask();
if (!node_to_cpumask)
goto outnpresmsk;
return NULL;
masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
if (!masks)
@ -205,30 +251,8 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
for (curvec = 0; curvec < affd->pre_vectors; curvec++)
cpumask_copy(masks + curvec, irq_default_affinity);
/* Stabilize the cpumasks */
get_online_cpus();
build_node_to_cpumask(node_to_cpumask);
/* Spread on present CPUs starting from affd->pre_vectors */
usedvecs = irq_build_affinity_masks(affd, curvec, affvecs,
node_to_cpumask, cpu_present_mask,
nmsk, masks);
/*
* Spread on non present CPUs starting from the next vector to be
* handled. If the spreading of present CPUs already exhausted the
* vector space, assign the non present CPUs to the already spread
* out vectors.
*/
if (usedvecs >= affvecs)
curvec = affd->pre_vectors;
else
curvec = affd->pre_vectors + usedvecs;
cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
usedvecs += irq_build_affinity_masks(affd, curvec, affvecs,
node_to_cpumask, npresmsk,
nmsk, masks);
put_online_cpus();
node_to_cpumask, masks);
/* Fill out vectors at the end that don't need affinity */
if (usedvecs >= affvecs)
@ -240,10 +264,6 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
outnodemsk:
free_node_to_cpumask(node_to_cpumask);
outnpresmsk:
free_cpumask_var(npresmsk);
outcpumsk:
free_cpumask_var(nmsk);
return masks;
}