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Merge branch 'irq/for-block' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-4.21/block 

Pull in the irq affinity commits, that are staged through Thomas's
tree.

* 'irq/for-block' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/affinity: Add support for allocating interrupt sets
  genirq/affinity: Pass first vector to __irq_build_affinity_masks()
  genirq/affinity: Move two stage affinity spreading into a helper function
  genirq/affinity: Spread IRQs to all available NUMA nodes
This commit is contained in:
Jens Axboe 2018-11-07 13:43:54 -07:00
parent 9cf2bab630 6da4b3ab9a
commit a0fedc857d
3 changed files with 118 additions and 48 deletions
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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

@ -247,10 +247,14 @@ 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)

144
kernel/irq/affinity.c
View File

@ -94,15 +94,15 @@ 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,
int startvec, int numvecs,
static int __irq_build_affinity_masks(const struct irq_affinity *affd,
int startvec, int numvecs, int firstvec,
cpumask_var_t *node_to_cpumask,
const struct cpumask *cpu_mask,
struct cpumask *nmsk,
struct cpumask *masks)
{
int n, nodes, cpus_per_vec, extra_vecs, done = 0;
int last_affv = affd->pre_vectors + numvecs;
int last_affv = firstvec + numvecs;
int curvec = startvec;
nodemask_t nodemsk = NODE_MASK_NONE;
@ -117,12 +117,11 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
*/
if (numvecs <= nodes) {
for_each_node_mask(n, nodemsk) {
cpumask_copy(masks + curvec, node_to_cpumask[n]);
if (++done == numvecs)
break;
cpumask_or(masks + curvec, masks + curvec, node_to_cpumask[n]);
if (++curvec == last_affv)
curvec = affd->pre_vectors;
curvec = firstvec;
}
done = numvecs;
goto out;
}
@ -130,7 +129,7 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
int ncpus, v, vecs_to_assign, vecs_per_node;
/* Spread the vectors per node */
vecs_per_node = (numvecs - (curvec - affd->pre_vectors)) / nodes;
vecs_per_node = (numvecs - (curvec - firstvec)) / nodes;
/* Get the cpus on this node which are in the mask */
cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
@ -158,7 +157,7 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
if (done >= numvecs)
break;
if (curvec >= last_affv)
curvec = affd->pre_vectors;
curvec = firstvec;
--nodes;
}
@ -166,6 +165,62 @@ 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, int firstvec,
cpumask_var_t *node_to_cpumask,
struct cpumask *masks)
{
int curvec = startvec, nr_present, nr_others;
int ret = -ENOMEM;
cpumask_var_t nmsk, npresmsk;
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
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 */
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
* handled. If the spreading of present CPUs already exhausted the
* vector space, assign the non present CPUs to the already spread
* out vectors.
*/
if (nr_present >= numvecs)
curvec = firstvec;
else
curvec = firstvec + nr_present;
cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
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 ret;
}
/**
* irq_create_affinity_masks - Create affinity masks for multiqueue spreading
* @nvecs: The total number of vectors
@ -178,8 +233,9 @@ 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;
int i, nr_sets;
/*
* If there aren't any vectors left after applying the pre/post
@ -188,15 +244,9 @@ 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)
@ -206,30 +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);
/* 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.
* Spread on present CPUs starting from affd->pre_vectors. If we
* have multiple sets, build each sets affinity mask separately.
*/
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();
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)
@ -241,10 +289,6 @@ 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;
}
@ -258,13 +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;
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();
ret = min_t(int, cpumask_weight(cpu_possible_mask), vecs) + resv;
set_vecs = cpumask_weight(cpu_possible_mask);
put_online_cpus();
return ret;
}
return resv + min(set_vecs, vecs);
}