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-rw-r--r--kernel/irq/affinity.c162
1 files changed, 106 insertions, 56 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index a37a3b4b6342..f4f29b9d90ee 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -39,7 +39,7 @@ static void irq_spread_init_one(struct cpumask *irqmsk, struct cpumask *nmsk,
}
}
-static cpumask_var_t *alloc_node_to_possible_cpumask(void)
+static cpumask_var_t *alloc_node_to_cpumask(void)
{
cpumask_var_t *masks;
int node;
@@ -62,7 +62,7 @@ out_unwind:
return NULL;
}
-static void free_node_to_possible_cpumask(cpumask_var_t *masks)
+static void free_node_to_cpumask(cpumask_var_t *masks)
{
int node;
@@ -71,7 +71,7 @@ static void free_node_to_possible_cpumask(cpumask_var_t *masks)
kfree(masks);
}
-static void build_node_to_possible_cpumask(cpumask_var_t *masks)
+static void build_node_to_cpumask(cpumask_var_t *masks)
{
int cpu;
@@ -79,14 +79,14 @@ static void build_node_to_possible_cpumask(cpumask_var_t *masks)
cpumask_set_cpu(cpu, masks[cpu_to_node(cpu)]);
}
-static int get_nodes_in_cpumask(cpumask_var_t *node_to_possible_cpumask,
+static int get_nodes_in_cpumask(cpumask_var_t *node_to_cpumask,
const struct cpumask *mask, nodemask_t *nodemsk)
{
int n, nodes = 0;
/* Calculate the number of nodes in the supplied affinity mask */
for_each_node(n) {
- if (cpumask_intersects(mask, node_to_possible_cpumask[n])) {
+ if (cpumask_intersects(mask, node_to_cpumask[n])) {
node_set(n, *nodemsk);
nodes++;
}
@@ -94,73 +94,46 @@ static int get_nodes_in_cpumask(cpumask_var_t *node_to_possible_cpumask,
return nodes;
}
-/**
- * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
- * @nvecs: The total number of vectors
- * @affd: Description of the affinity requirements
- *
- * Returns the masks pointer or NULL if allocation failed.
- */
-struct cpumask *
-irq_create_affinity_masks(int nvecs, 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,
+ struct cpumask *nmsk,
+ struct cpumask *masks)
{
- int n, nodes, cpus_per_vec, extra_vecs, curvec;
- int affv = nvecs - affd->pre_vectors - affd->post_vectors;
- int last_affv = affv + affd->pre_vectors;
+ int n, nodes, cpus_per_vec, extra_vecs, done = 0;
+ int last_affv = affd->pre_vectors + numvecs;
+ int curvec = startvec;
nodemask_t nodemsk = NODE_MASK_NONE;
- struct cpumask *masks;
- cpumask_var_t nmsk, *node_to_possible_cpumask;
-
- /*
- * If there aren't any vectors left after applying the pre/post
- * vectors don't bother with assigning affinity.
- */
- if (!affv)
- return NULL;
-
- if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
- return NULL;
-
- masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
- if (!masks)
- goto out;
- node_to_possible_cpumask = alloc_node_to_possible_cpumask();
- if (!node_to_possible_cpumask)
- goto out;
+ if (!cpumask_weight(cpu_mask))
+ return 0;
- /* Fill out vectors at the beginning that don't need affinity */
- for (curvec = 0; curvec < affd->pre_vectors; curvec++)
- cpumask_copy(masks + curvec, irq_default_affinity);
-
- /* Stabilize the cpumasks */
- get_online_cpus();
- build_node_to_possible_cpumask(node_to_possible_cpumask);
- nodes = get_nodes_in_cpumask(node_to_possible_cpumask, cpu_possible_mask,
- &nodemsk);
+ nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk);
/*
* If the number of nodes in the mask is greater than or equal the
* number of vectors we just spread the vectors across the nodes.
*/
- if (affv <= nodes) {
+ if (numvecs <= nodes) {
for_each_node_mask(n, nodemsk) {
- cpumask_copy(masks + curvec,
- node_to_possible_cpumask[n]);
- if (++curvec == last_affv)
+ cpumask_copy(masks + curvec, node_to_cpumask[n]);
+ if (++done == numvecs)
break;
+ if (++curvec == last_affv)
+ curvec = affd->pre_vectors;
}
- goto done;
+ goto out;
}
for_each_node_mask(n, nodemsk) {
int ncpus, v, vecs_to_assign, vecs_per_node;
/* Spread the vectors per node */
- vecs_per_node = (affv - (curvec - affd->pre_vectors)) / nodes;
+ vecs_per_node = (numvecs - (curvec - affd->pre_vectors)) / nodes;
/* Get the cpus on this node which are in the mask */
- cpumask_and(nmsk, cpu_possible_mask, node_to_possible_cpumask[n]);
+ cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
/* Calculate the number of cpus per vector */
ncpus = cpumask_weight(nmsk);
@@ -181,19 +154,96 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
irq_spread_init_one(masks + curvec, nmsk, cpus_per_vec);
}
- if (curvec >= last_affv)
+ done += v;
+ if (done >= numvecs)
break;
+ if (curvec >= last_affv)
+ curvec = affd->pre_vectors;
--nodes;
}
-done:
+out:
+ return done;
+}
+
+/**
+ * irq_create_affinity_masks - Create affinity masks for multiqueue spreading
+ * @nvecs: The total number of vectors
+ * @affd: Description of the affinity requirements
+ *
+ * Returns the masks pointer or NULL if allocation failed.
+ */
+struct cpumask *
+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;
+ struct cpumask *masks = NULL;
+
+ /*
+ * If there aren't any vectors left after applying the pre/post
+ * vectors don't bother with assigning affinity.
+ */
+ 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;
+
+ masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
+ if (!masks)
+ goto outnodemsk;
+
+ /* Fill out vectors at the beginning that don't need affinity */
+ 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();
/* Fill out vectors at the end that don't need affinity */
+ if (usedvecs >= affvecs)
+ curvec = affd->pre_vectors + affvecs;
+ else
+ curvec = affd->pre_vectors + usedvecs;
for (; curvec < nvecs; curvec++)
cpumask_copy(masks + curvec, irq_default_affinity);
- free_node_to_possible_cpumask(node_to_possible_cpumask);
-out:
+
+outnodemsk:
+ free_node_to_cpumask(node_to_cpumask);
+outnpresmsk:
+ free_cpumask_var(npresmsk);
+outcpumsk:
free_cpumask_var(nmsk);
return masks;
}

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