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Commit 6ac17fe8 authored by Anup Patel's avatar Anup Patel Committed by Jassi Brar
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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: default avatarAnup Patel <anup.patel@broadcom.com>
Reviewed-by: default avatarRay Jui <ray.jui@broadcom.com>
Reviewed-by: default avatarScott Branden <scott.branden@broadcom.com>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
parent 14ccee78

drivers/mailbox/bcm-flexrm-mailbox.c

+17 −0
Original line number Original line Diff line number Diff line
@@ -260,6 +260,7 @@ struct flexrm_ring { 
	void __iomem *regs;

	void __iomem *regs;

	bool irq_requested;

	bool irq_requested;

	unsigned int irq;

	unsigned int irq;

	cpumask_t irq_aff_hint;

	unsigned int msi_timer_val;

	unsigned int msi_timer_val;

	unsigned int msi_count_threshold;

	unsigned int msi_count_threshold;

	struct ida requests_ida;

	struct ida requests_ida;
@@ -1217,6 +1218,18 @@ static int flexrm_startup(struct mbox_chan *chan) 
	}

	}

	ring->irq_requested = true;

	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 */

	/* Disable/inactivate ring */

	writel_relaxed(0x0, ring->regs + RING_CONTROL);

	writel_relaxed(0x0, ring->regs + RING_CONTROL);
@@ -1261,6 +1274,9 @@ static int flexrm_startup(struct mbox_chan *chan) 




	return 0;

	return 0;





fail_free_irq:

	free_irq(ring->irq, ring);

	ring->irq_requested = false;

fail_free_cmpl_memory:

fail_free_cmpl_memory:

	dma_pool_free(ring->mbox->cmpl_pool,

	dma_pool_free(ring->mbox->cmpl_pool,

		      ring->cmpl_base, ring->cmpl_dma_base);

		      ring->cmpl_base, ring->cmpl_dma_base);
@@ -1314,6 +1330,7 @@ static void flexrm_shutdown(struct mbox_chan *chan) 




	/* Release IRQ */

	/* Release IRQ */

	if (ring->irq_requested) {

	if (ring->irq_requested) {

		irq_set_affinity_hint(ring->irq, NULL);

		free_irq(ring->irq, ring);

		free_irq(ring->irq, ring);

		ring->irq_requested = false;

		ring->irq_requested = false;

	}

	}