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genirq/affinity: Add support for allocating interrupt sets 

to #28991349

commit 6da4b3ab9a upstream

A driver may have a need to allocate multiple sets of MSI/MSI-X interrupts,
and have them appropriately affinitized.

Add support for defining a number of sets in the irq_affinity structure, of
varying sizes, and get each set affinitized correctly across the machine.

[ tglx: Minor changelog tweaks ]

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Cc: linux-block@vger.kernel.org
Link: https://lkml.kernel.org/r/20181102145951.31979-5-ming.lei@redhat.com

Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
This commit is contained in:
Jens Axboe 2018-11-02 22:59:51 +08:00 committed by Caspar Zhang
parent b420534408
commit 292e47eff9
3 changed files with 72 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/pci/msi.c
View File

@ -1036,6 +1036,13 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
if (maxvec < minvec)
return -ERANGE;
/*
* If the caller is passing in sets, we can't support a range of
* vectors. The caller needs to handle that.
*/
if (affd && affd->nr_sets && minvec != maxvec)
return -EINVAL;
if (WARN_ON_ONCE(dev->msi_enabled))
return -EINVAL;
@ -1087,6 +1094,13 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
if (maxvec < minvec)
return -ERANGE;
/*
* If the caller is passing in sets, we can't support a range of
* supported vectors. The caller needs to handle that.
*/
if (affd && affd->nr_sets && minvec != maxvec)
return -EINVAL;
if (WARN_ON_ONCE(dev->msix_enabled))
return -EINVAL;

4
include/linux/interrupt.h
View File

@ -265,10 +265,14 @@ struct irq_affinity_notify {
* the MSI(-X) vector space
* @post_vectors: Don't apply affinity to @post_vectors at end of
* the MSI(-X) vector space
* @nr_sets: Length of passed in *sets array
* @sets: Number of affinitized sets
*/
struct irq_affinity {
int pre_vectors;
int post_vectors;
int nr_sets;
int *sets;
};
#if defined(CONFIG_SMP)

77
kernel/irq/affinity.c
View File

@ -171,28 +171,29 @@ out:
* 2) spread other possible CPUs on these vectors
*/
static int irq_build_affinity_masks(const struct irq_affinity *affd,
int startvec, int numvecs,
int startvec, int numvecs, int firstvec,
cpumask_var_t *node_to_cpumask,
struct cpumask *masks)
{
int curvec = startvec, usedvecs = -1;
int curvec = startvec, nr_present, nr_others;
int ret = -ENOMEM;
cpumask_var_t nmsk, npresmsk;
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
return usedvecs;
return ret;
if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
goto fail;
ret = 0;
/* 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,
affd->pre_vectors,
node_to_cpumask,
cpu_present_mask, nmsk, masks);
nr_present = __irq_build_affinity_masks(affd, curvec, numvecs,
firstvec, node_to_cpumask,
cpu_present_mask, nmsk, masks);
/*
* Spread on non present CPUs starting from the next vector to be
@ -200,23 +201,24 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
* vector space, assign the non present CPUs to the already spread
* out vectors.
*/
if (usedvecs >= numvecs)
curvec = affd->pre_vectors;
if (nr_present >= numvecs)
curvec = firstvec;
else
curvec = affd->pre_vectors + usedvecs;
curvec = firstvec + nr_present;
cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
usedvecs += __irq_build_affinity_masks(affd, curvec, numvecs,
affd->pre_vectors,
node_to_cpumask, npresmsk,
nmsk, masks);
nr_others = __irq_build_affinity_masks(affd, curvec, numvecs,
firstvec, node_to_cpumask,
npresmsk, nmsk, masks);
put_online_cpus();
if (nr_present < numvecs)
WARN_ON(nr_present + nr_others < numvecs);
free_cpumask_var(npresmsk);
fail:
free_cpumask_var(nmsk);
return usedvecs;
return ret;
}
/**
@ -233,6 +235,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
int curvec, usedvecs;
cpumask_var_t *node_to_cpumask;
struct cpumask *masks = NULL;
int i, nr_sets;
/*
* If there aren't any vectors left after applying the pre/post
@ -253,8 +256,28 @@ 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);
usedvecs = irq_build_affinity_masks(affd, curvec, affvecs,
node_to_cpumask, masks);
/*
* Spread on present CPUs starting from affd->pre_vectors. If we
* have multiple sets, build each sets affinity mask separately.
*/
nr_sets = affd->nr_sets;
if (!nr_sets)
nr_sets = 1;
for (i = 0, usedvecs = 0; i < nr_sets; i++) {
int this_vecs = affd->sets ? affd->sets[i] : affvecs;
int ret;
ret = irq_build_affinity_masks(affd, curvec, this_vecs,
curvec, node_to_cpumask, masks);
if (ret) {
kfree(masks);
masks = NULL;
goto outnodemsk;
}
curvec += this_vecs;
usedvecs += this_vecs;
}
/* Fill out vectors at the end that don't need affinity */
if (usedvecs >= affvecs)
@ -279,13 +302,21 @@ int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity
{
int resv = affd->pre_vectors + affd->post_vectors;
int vecs = maxvec - resv;
int ret;
int set_vecs;
if (resv > minvec)
return 0;
get_online_cpus();
ret = min_t(int, cpumask_weight(cpu_possible_mask), vecs) + resv;
put_online_cpus();
return ret;
if (affd->nr_sets) {
int i;
for (i = 0, set_vecs = 0; i < affd->nr_sets; i++)
set_vecs += affd->sets[i];
} else {
get_online_cpus();
set_vecs = cpumask_weight(cpu_possible_mask);
put_online_cpus();
}
return resv + min(set_vecs, vecs);
}