Commit 91bf6395 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

irqchip/gic-v4.1: Add VPE residency callback 



Making a VPE resident on GICv4.1 is pretty simple, as it is just a
single write to the local redistributor. We just need extra information
about which groups to enable, which the KVM code will have to provide.

Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Reviewed-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191224111055.11836-12-maz@kernel.org
parent d97c97ba

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

+17 −0
Original line number Diff line number Diff line
@@ -3624,12 +3624,29 @@ static void its_vpe_4_1_unmask_irq(struct irq_data *d) 
	its_vpe_4_1_send_inv(d);

}



static void its_vpe_4_1_schedule(struct its_vpe *vpe,

				 struct its_cmd_info *info)

{

	void __iomem *vlpi_base = gic_data_rdist_vlpi_base();

	u64 val = 0;



	/* Schedule the VPE */

	val |= GICR_VPENDBASER_Valid;

	val |= info->g0en ? GICR_VPENDBASER_4_1_VGRP0EN : 0;

	val |= info->g1en ? GICR_VPENDBASER_4_1_VGRP1EN : 0;

	val |= FIELD_PREP(GICR_VPENDBASER_4_1_VPEID, vpe->vpe_id);



	gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);

}



static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)

{

	struct its_vpe *vpe = irq_data_get_irq_chip_data(d);

	struct its_cmd_info *info = vcpu_info;



	switch (info->cmd_type) {

	case SCHEDULE_VPE:

		its_vpe_4_1_schedule(vpe, info);

		return 0;



	case DESCHEDULE_VPE:

include/linux/irqchip/arm-gic-v3.h

+9 −0
Original line number Diff line number Diff line
@@ -327,6 +327,15 @@ 
#define GICR_VPENDBASER_IDAI		(1ULL << 62)

#define GICR_VPENDBASER_Valid		(1ULL << 63)



/*

 * GICv4.1 VPENDBASER, used for VPE residency. On top of these fields,

 * also use the above Valid, PendingLast and Dirty.

 */

#define GICR_VPENDBASER_4_1_DB		(1ULL << 62)

#define GICR_VPENDBASER_4_1_VGRP0EN	(1ULL << 59)

#define GICR_VPENDBASER_4_1_VGRP1EN	(1ULL << 58)

#define GICR_VPENDBASER_4_1_VPEID	GENMASK_ULL(15, 0)



/*

 * ITS registers, offsets from ITS_base

 */

include/linux/irqchip/arm-gic-v4.h

+5 −0
Original line number Diff line number Diff line
@@ -100,6 +100,11 @@ struct its_cmd_info { 
	union {

		struct its_vlpi_map	*map;

		u8			config;

		bool			req_db;

		struct {

			bool		g0en;

			bool		g1en;

		};

	};

};

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