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     Y€ЙЛѓy—[ИїН  ·    Y/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * Copyright (C) Ashok Raj <ashok.raj@intel.com>
 * Copyright (C) Shaohua Li <shaohua.li@intel.com>
 */

#ifndef __DMAR_H__
#define __DMAR_H__

#include <linux/acpi.h>
#include <linux/types.h>
#include <linux/msi.h>
#include <linux/irqreturn.h>
#include <linux/rwsem.h>
#include <linux/rculist.h>

struct acpi_dmar_header;

#define DMAR_UNITS_SUPPORTED	1024

/* DMAR Flags */
#define DMAR_INTR_REMAP		0x1
#define DMAR_X2APIC_OPT_OUT	0x2
#define DMAR_PLATFORM_OPT_IN	0x4

struct intel_iommu;

struct dmar_dev_scope {
	struct device __rcu *dev;
	u8 bus;
	u8 devfn;
};

#ifdef CONFIG_DMAR_TABLE
extern struct acpi_table_header *dmar_tbl;
struct dmar_drhd_unit {
	struct list_head list;		/* list of drhd units	*/
	struct  acpi_dmar_header *hdr;	/* ACPI header		*/
	u64	reg_base_addr;		/* register base address*/
	unsigned long reg_size;		/* size of register set */
	struct	dmar_dev_scope *devices;/* target device array	*/
	int	devices_cnt;		/* target device count	*/
	u16	segment;		/* PCI domain		*/
	u8	ignored:1; 		/* ignore drhd		*/
	u8	include_all:1;
	u8	gfx_dedicated:1;	/* graphic dedicated	*/
	struct intel_iommu *iommu;
};

struct dmar_pci_path {
	u8 bus;
	u8 device;
	u8 function;
};

struct dmar_pci_notify_info {
	struct pci_dev			*dev;
	unsigned long			event;
	int				bus;
	u16				seg;
	u16				level;
	struct dmar_pci_path		path[];
}  __attribute__((packed));

extern struct rw_semaphore dmar_global_lock;
extern struct list_head dmar_drhd_units;

#define for_each_drhd_unit(drhd)					\
	list_for_each_entry_rcu(drhd, &dmar_drhd_units, list,		\
				dmar_rcu_check())

#define for_each_active_drhd_unit(drhd)					\
	list_for_each_entry_rcu(drhd, &dmar_drhd_units, list,		\
				dmar_rcu_check())			\
		if (drhd->ignored) {} else

#define for_each_active_iommu(i, drhd)					\
	list_for_each_entry_rcu(drhd, &dmar_drhd_units, list,		\
				dmar_rcu_check())			\
		if (i=drhd->iommu, drhd->ignored) {} else

#define for_each_iommu(i, drhd)						\
	list_for_each_entry_rcu(drhd, &dmar_drhd_units, list,		\
				dmar_rcu_check())			\
		if (i=drhd->iommu, 0) {} else 

static inline bool dmar_rcu_check(void)
{
	return rwsem_is_locked(&dmar_global_lock) ||
	       system_state == SYSTEM_BOOTING;
}

#define	dmar_rcu_dereference(p)	rcu_dereference_check((p), dmar_rcu_check())

#define for_each_dev_scope(devs, cnt, i, tmp)				\
	for ((i) = 0; ((tmp) = (i) < (cnt) ?				\
	    dmar_rcu_dereference((devs)[(i)].dev) : NULL, (i) < (cnt)); \
	    (i)++)

#define for_each_active_dev_scope(devs, cnt, i, tmp)			\
	for_each_dev_scope((devs), (cnt), (i), (tmp))			\
		if (!(tmp)) { continue; } else

extern int dmar_table_init(void);
extern int dmar_dev_scope_init(void);
extern void dmar_register_bus_notifier(void);
extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
				struct dmar_dev_scope **devices, u16 segment);
extern void *dmar_alloc_dev_scope(void *start, void *end, int *cnt);
extern void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt);
extern int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
				 void *start, void*end, u16 segment,
				 struct dmar_dev_scope *devices,
				 int devices_cnt);
extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
				 u16 segment, struct dmar_dev_scope *devices,
				 int count);
/* Intel IOMMU detection */
void detect_intel_iommu(void);
extern int enable_drhd_fault_handling(unsigned int cpu);
extern int dmar_device_add(acpi_handle handle);
extern int dmar_device_remove(acpi_handle handle);

static inline int dmar_res_noop(struct acpi_dmar_header *hdr, void *arg)
{
	return 0;
}

#ifdef CONFIG_DMAR_DEBUG
void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id,
			  unsigned long long addr, u32 pasid);
#else
static inline void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id,
					unsigned long long addr, u32 pasid) {}
#endif

#ifdef CONFIG_INTEL_IOMMU
extern int iommu_detected, no_iommu;
extern int int