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Subject[PATCH V2 1/4] genirq/affinity: store irq set vectors in 'struct irq_affinity'
Date
Currently the array of irq set vectors is provided by driver.

irq_create_affinity_masks() can be simplied a bit by treating the
non-irq-set case as single irq set.

So move this array into 'struct irq_affinity', and pre-define the max
set number as 4, which should be enough for normal cases.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/nvme/host/pci.c | 5 ++---
include/linux/interrupt.h | 8 +++++---
kernel/irq/affinity.c | 10 ++++++----
3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 022ea1ee63f8..0086bdf80ea1 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2081,12 +2081,11 @@ static void nvme_calc_io_queues(struct nvme_dev *dev, unsigned int irq_queues)
static int nvme_setup_irqs(struct nvme_dev *dev, unsigned int nr_io_queues)
{
struct pci_dev *pdev = to_pci_dev(dev->dev);
- int irq_sets[2];
struct irq_affinity affd = {
.pre_vectors = 1,
- .nr_sets = ARRAY_SIZE(irq_sets),
- .sets = irq_sets,
+ .nr_sets = 2,
};
+ int *irq_sets = affd.set_vectors;
int result = 0;
unsigned int irq_queues, this_p_queues;

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 7c9434652f36..a20150627a32 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -259,6 +259,8 @@ struct irq_affinity_notify {
void (*release)(struct kref *ref);
};

+#define IRQ_MAX_SETS 4
+
/**
* struct irq_affinity - Description for automatic irq affinity assignements
* @pre_vectors: Don't apply affinity to @pre_vectors at beginning of
@@ -266,13 +268,13 @@ struct irq_affinity_notify {
* @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
+ * @set_vectors: Number of affinitized sets
*/
struct irq_affinity {
int pre_vectors;
int post_vectors;
int nr_sets;
- int *sets;
+ int set_vectors[IRQ_MAX_SETS];
};

/**
@@ -332,7 +334,7 @@ extern int
irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);

struct irq_affinity_desc *
-irq_create_affinity_masks(int nvec, const struct irq_affinity *affd);
+irq_create_affinity_masks(int nvec, struct irq_affinity *affd);

int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd);

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 118b66d64a53..a97b7c33d2db 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -239,7 +239,7 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
* Returns the irq_affinity_desc pointer or NULL if allocation failed.
*/
struct irq_affinity_desc *
-irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
+irq_create_affinity_masks(int nvecs, struct irq_affinity *affd)
{
int affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
int curvec, usedvecs;
@@ -265,11 +265,13 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
* have multiple sets, build each sets affinity mask separately.
*/
nr_sets = affd->nr_sets;
- if (!nr_sets)
+ if (!nr_sets) {
nr_sets = 1;
+ affd->set_vectors[0] = affvecs;
+ }

for (i = 0, usedvecs = 0; i < nr_sets; i++) {
- int this_vecs = affd->sets ? affd->sets[i] : affvecs;
+ int this_vecs = affd->set_vectors[i];
int ret;

ret = irq_build_affinity_masks(affd, curvec, this_vecs,
@@ -316,7 +318,7 @@ int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity
int i;

for (i = 0, set_vecs = 0; i < affd->nr_sets; i++)
- set_vecs += affd->sets[i];
+ set_vecs += affd->set_vectors[i];
} else {
get_online_cpus();
set_vecs = cpumask_weight(cpu_possible_mask);
--
2.9.5
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