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Commit e57a3e28 authored by Marc Zyngier's avatar Marc Zyngier
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irqchip/gic-v3-its: Allow doorbell interrupts to be injected/cleared 



While the doorbell interrupts are usually driven by the HW itself,
having a way to trigger them independently has proved to be a
really useful debug feature. As it is actually very little code,
let's add it to the VPE irqchip operations.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 958b90d1

drivers/irqchip/irq-gic-v3-its.c

+31 −0
Original line number Diff line number Diff line
@@ -2504,12 +2504,43 @@ static void its_vpe_unmask_irq(struct irq_data *d) 
	its_vpe_send_inv(d);

}



static int its_vpe_set_irqchip_state(struct irq_data *d,

				     enum irqchip_irq_state which,

				     bool state)

{

	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);



	if (which != IRQCHIP_STATE_PENDING)

		return -EINVAL;



	if (gic_rdists->has_direct_lpi) {

		void __iomem *rdbase;



		rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;

		if (state) {

			gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR);

		} else {

			gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);

			while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)

				cpu_relax();

		}

	} else {

		if (state)

			its_vpe_send_cmd(vpe, its_send_int);

		else

			its_vpe_send_cmd(vpe, its_send_clear);

	}



	return 0;

}



static struct irq_chip its_vpe_irq_chip = {

	.name			= "GICv4-vpe",

	.irq_mask		= its_vpe_mask_irq,

	.irq_unmask		= its_vpe_unmask_irq,

	.irq_eoi		= irq_chip_eoi_parent,

	.irq_set_affinity	= its_vpe_set_affinity,

	.irq_set_irqchip_state	= its_vpe_set_irqchip_state,

	.irq_set_vcpu_affinity	= its_vpe_set_vcpu_affinity,

};