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/*
 * Copyright (C) 2016,2017 ARM Limited, All Rights Reserved.
 * Author: Marc Zyngier <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __LINUX_IRQCHIP_ARM_GIC_V4_H
#define __LINUX_IRQCHIP_ARM_GIC_V4_H

struct its_vpe;

/*
 * Maximum number of ITTs when GITS_TYPER.VMOVP == 0, using the
 * ITSList mechanism to perform inter-ITS synchronization.
 */
#define GICv4_ITS_LIST_MAX		16

/* Embedded in kvm.arch */
struct its_vm {
	struct fwnode_handle	*fwnode;
	struct irq_domain	*domain;
	struct page		*vprop_page;
	struct its_vpe		**vpes;
	int			nr_vpes;
	irq_hw_number_t		db_lpi_base;
	unsigned long		*db_bitmap;
	int			nr_db_lpis;
	u32			vlpi_count[GICv4_ITS_LIST_MAX];
};

/* Embedded in kvm_vcpu.arch */
struct its_vpe {
	struct page 		*vpt_page;
	struct its_vm		*its_vm;
	/* per-vPE VLPI tracking */
	atomic_t		vlpi_count;
	/* Doorbell interrupt */
	int			irq;
	irq_hw_number_t		vpe_db_lpi;
	/* VPE resident */
	bool			resident;
	union {
		/* GICv4.0 implementations */
		struct {
			/* VPE proxy mapping */
			int	vpe_proxy_event;
			/* Implementation Defined Area Invalid */
			bool	idai;
		};
		/* GICv4.1 implementations */
		struct {
			struct fwnode_handle	*fwnode;
			struct irq_domain	*sgi_domain;
			struct {
				u8	priority;
				bool	enabled;
				bool	group;
			}			sgi_config[16];
			atomic_t vmapp_count;
		};
	};

	/*
	 * Ensures mutual exclusion between affinity setting of the
	 * vPE and vLPI operations using vpe->col_idx.
	 */
	raw_spinlock_t		vpe_lock;
	/*
	 * This collection ID is used to indirect the target
	 * redistributor for this VPE. The ID itself isn't involved in
	 * programming of the ITS.
	 */
	u16			col_idx;
	/* Unique (system-wide) VPE identifier */
	u16			vpe_id;
	/* Pending VLPIs on schedule out? */
	bool			pending_last;
};

/*
 * struct its_vlpi_map: structure describing the mapping of a
 * VLPI. Only to be interpreted in the context of a physical interrupt
 * it complements.  To be used as the vcpu_info passed to
 * irq_set_vcpu_affinity().
 *
 * @vm:		Pointer to the GICv4 notion of a VM
 * @vpe:	Pointer to the GICv4 notion of a virtual CPU (VPE)
 * @vintid:	Virtual LPI number
 * @properties:	Priority and enable bits (as written in the prop table)
 * @db_enabled:	Is the VPE doorbell to be generated?
 */
struct its_vlpi_map {
	struct its_vm		*vm;
	struct its_vpe		*vpe;
	u32			vintid;
	u8			properties;
	bool			db_enabled;
};

enum its_vcpu_info_cmd_type {
	MAP_VLPI,
	GET_VLPI,
	PROP_UPDATE_VLPI,
	PROP_UPDATE_AND_INV_VLPI,
	SCHEDULE_VPE,
	DESCHEDULE_VPE,
	INVALL_VPE,
	PROP_UPDATE_VSGI,
};

struct its_cmd_info {
	enum its_vcpu_info_cmd_type	cmd_type;
	union {
		struct its_vlpi_map	*map;
		u8			config;
		bool			req_db;
		struct {
			bool		g0en;
			bool		g1en;
		};
		struct {
			u8		priority;
			bool		group;
		};
	};
};

int its_alloc_vcpu_irqs(struct its_vm *vm);
void its_free_vcpu_irqs(struct its_vm *vm);
int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en);
int its_make_vpe_non_resident(struct its_vpe *vpe, bool db);
int its_invall_vpe(struct its_vpe *vpe);
int its_map_vlpi(int irq, struct its_vlpi_map *map);
int its_get_vlpi(int irq, struct its_vlpi_map *map);
int its_unmap_vlpi(int irq);
int its_prop_update_vlpi(int irq, u8 config, bool inv);
int its_prop_update_vsgi(int irq, u8 priority, bool group);

struct irq_domain_ops;
int its_init_v4(struct irq_domain *domain,
		const struct irq_domain_ops *vpe_ops,
		const struct irq_domain_ops *sgi_ops);

#endif