[PATCH v3 1/5] mailbox: bcm-flexrm-mailbox: Set IRQ affinity hint for FlexRM ring IRQs
From: Anup Patel <hidden>
Date: 2017-08-01 10:36:22
Also in:
linux-devicetree, lkml
Subsystem:
mailbox api, the rest · Maintainers:
Jassi Brar, Linus Torvalds
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 <redacted> Reviewed-by: Ray Jui <redacted> Reviewed-by: Scott Branden <scott.branden@broadcom.com> --- drivers/mailbox/bcm-flexrm-mailbox.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index da67882..e8c3666 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; }
--
2.7.4