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authorAnup Patel <anup.patel@broadcom.com>2017-08-01 16:05:50 +0530
committerJassi Brar <jaswinder.singh@linaro.org>2017-08-31 08:38:44 +0530
commit6ac17fe8c14aaec3940a92a6b39fe3f6389f5a4d (patch)
treefd5273bd61e38e568ea8e4f19869aa75b5d85322 /drivers/mailbox
parent14ccee78fc82f5512908f4424f541549a5705b89 (diff)
mailbox: bcm-flexrm-mailbox: Set IRQ affinity hint for FlexRM ring IRQs
This patch set IRQ affinity hint for FlexRM ring IRQ at time of enabling ring (i.e. flexrm_startup()). The IRQ affinity hint will allow FlexRM driver to distribute FlexRM ring IRQs across online CPUs so that all FlexRM ring IRQs don't land in CPU0 by default. Signed-off-by: Anup Patel <anup.patel@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/bcm-flexrm-mailbox.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index da67882caa7b..e8c3666e94cf 100644
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -260,6 +260,7 @@ struct flexrm_ring {
void __iomem *regs;
bool irq_requested;
unsigned int irq;
+ cpumask_t irq_aff_hint;
unsigned int msi_timer_val;
unsigned int msi_count_threshold;
struct ida requests_ida;
@@ -1217,6 +1218,18 @@ static int flexrm_startup(struct mbox_chan *chan)
}
ring->irq_requested = true;
+ /* Set IRQ affinity hint */
+ ring->irq_aff_hint = CPU_MASK_NONE;
+ val = ring->mbox->num_rings;
+ val = (num_online_cpus() < val) ? val / num_online_cpus() : 1;
+ cpumask_set_cpu((ring->num / val) % num_online_cpus(),
+ &ring->irq_aff_hint);
+ ret = irq_set_affinity_hint(ring->irq, &ring->irq_aff_hint);
+ if (ret) {
+ dev_err(ring->mbox->dev, "failed to set IRQ affinity hint\n");
+ goto fail_free_irq;
+ }
+
/* Disable/inactivate ring */
writel_relaxed(0x0, ring->regs + RING_CONTROL);
@@ -1261,6 +1274,9 @@ static int flexrm_startup(struct mbox_chan *chan)
return 0;
+fail_free_irq:
+ free_irq(ring->irq, ring);
+ ring->irq_requested = false;
fail_free_cmpl_memory:
dma_pool_free(ring->mbox->cmpl_pool,
ring->cmpl_base, ring->cmpl_dma_base);
@@ -1314,6 +1330,7 @@ static void flexrm_shutdown(struct mbox_chan *chan)
/* Release IRQ */
if (ring->irq_requested) {
+ irq_set_affinity_hint(ring->irq, NULL);
free_irq(ring->irq, ring);
ring->irq_requested = false;
}

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