From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>,
Bjorn Helgaas <helgaas@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Sagi Grimberg <sagi@grimberg.me>,
linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, Keith Busch <keith.busch@intel.com>,
Ming Lei <ming.lei@redhat.com>
Subject: [PATCH V2 1/4] genirq/affinity: store irq set vectors in 'struct irq_affinity'
Date: Tue, 12 Feb 2019 21:04:36 +0800 [thread overview]
Message-ID: <20190212130439.14501-2-ming.lei@redhat.com> (raw)
In-Reply-To: <20190212130439.14501-1-ming.lei@redhat.com>
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
next prev parent reply other threads:[~2019-02-12 13:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 13:04 [PATCH V2 0/4] genirq/affinity: add .calc_sets for improving IRQ allocation & spread Ming Lei
2019-02-12 13:04 ` Ming Lei [this message]
2019-02-12 13:35 ` [PATCH V2 1/4] genirq/affinity: store irq set vectors in 'struct irq_affinity' Thomas Gleixner
2019-02-12 13:04 ` [PATCH V2 2/4] genirq/affinity: add new callback for caculating set vectors Ming Lei
2019-02-12 13:37 ` Thomas Gleixner
2019-02-12 13:04 ` [PATCH V2 3/4] nvme-pci: avoid irq allocation retrying via .calc_sets Ming Lei
2019-02-12 15:49 ` Keith Busch
2019-02-12 13:04 ` [PATCH V2 4/4] genirq/affinity: Document .calc_sets as required in case of multiple sets Ming Lei
2019-02-12 23:42 ` Bjorn Helgaas
2019-02-12 13:42 ` [PATCH V2 0/4] genirq/affinity: add .calc_sets for improving IRQ allocation & spread Thomas Gleixner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190212130439.14501-2-ming.lei@redhat.com \
--to=ming.lei@redhat.com \
--cc=axboe@kernel.dk \
--cc=hch@lst.de \
--cc=helgaas@kernel.org \
--cc=keith.busch@intel.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvme@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=sagi@grimberg.me \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).