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mailbox: bcm-flexrm-mailbox: Set IRQ affinity hint for FlexRM ring IRQs

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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>
This commit is contained in:
Anup Patel 2017-08-01 16:05:50 +05:30 committed by Jassi Brar
parent 14ccee78fc
commit 6ac17fe8c1
1 changed files with 17 additions and 0 deletions
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17
drivers/mailbox/bcm-flexrm-mailbox.c
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@ -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;
}