/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * This file defines the private interface between the
 * AMD kernel graphics drivers and the AMD KFD.
 */

#ifndef KGD_KFD_INTERFACE_H_INCLUDED
#define KGD_KFD_INTERFACE_H_INCLUDED

#include <linux/types.h>
#include <linux/bitmap.h>
#include <linux/dma-fence.h>

struct pci_dev;

#define KFD_INTERFACE_VERSION 2
#define KGD_MAX_QUEUES 128

struct kfd_dev;
struct kgd_dev;

struct kgd_mem;

enum kfd_preempt_type {
	KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN = 0,
	KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
};

struct kfd_vm_fault_info {
	uint64_t	page_addr;
	uint32_t	vmid;
	uint32_t	mc_id;
	uint32_t	status;
	bool		prot_valid;
	bool		prot_read;
	bool		prot_write;
	bool		prot_exec;
};

struct kfd_cu_info {
	uint32_t num_shader_engines;
	uint32_t num_shader_arrays_per_engine;
	uint32_t num_cu_per_sh;
	uint32_t cu_active_number;
	uint32_t cu_ao_mask;
	uint32_t simd_per_cu;
	uint32_t max_waves_per_simd;
	uint32_t wave_front_size;
	uint32_t max_scratch_slots_per_cu;
	uint32_t lds_size;
	uint32_t cu_bitmap[4][4];
};

/* For getting GPU local memory information from KGD */
struct kfd_local_mem_info {
	uint64_t local_mem_size_private;
	uint64_t local_mem_size_public;
	uint32_t vram_width;
	uint32_t mem_clk_max;
};

enum kgd_memory_pool {
	KGD_POOL_SYSTEM_CACHEABLE = 1,
	KGD_POOL_SYSTEM_WRITECOMBINE = 2,
	KGD_POOL_FRAMEBUFFER = 3,
};

enum kgd_engine_type {
	KGD_ENGINE_PFP = 1,
	KGD_ENGINE_ME,
	KGD_ENGINE_CE,
	KGD_ENGINE_MEC1,
	KGD_ENGINE_MEC2,
	KGD_ENGINE_RLC,
	KGD_ENGINE_SDMA1,
	KGD_ENGINE_SDMA2,
	KGD_ENGINE_MAX
};

/**
 * enum kfd_sched_policy
 *
 * @KFD_SCHED_POLICY_HWS: H/W scheduling policy known as command processor (cp)
 * scheduling. In this scheduling mode we're using the firmware code to
 * schedule the user mode queues and kernel queues such as HIQ and DIQ.
 * the HIQ queue is used as a special queue that dispatches the configuration
 * to the cp and the user mode queues list that are currently running.
 * the DIQ queue is a debugging queue that dispatches debugging commands to the
 * firmware.
 * in this scheduling mode user mode queues over subscription feature is
 * enabled.
 *
 * @KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION: The same as above but the over
 * subscription feature disabled.
 *
 * @KFD_SCHED_POLICY_NO_HWS: no H/W scheduling policy is a mode which directly
 * set the command processor registers and sets the queues "manually". This
 * mode is used *ONLY* for debugging proposes.
 *
 */
enum kfd_sched_policy {
	KFD_SCHED_POLICY_HWS = 0,
	KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION,
	KFD_SCHED_POLICY_NO_HWS
};

struct kgd2kfd_shared_resources {
	/* Bit n == 1 means VMID n is available for KFD. */
	unsigned int compute_vmid_bitmap;

	/* number of pipes per mec */
	uint32_t num_pipe_per_mec;

	/* number of queues per pipe */
	uint32_t num_queue_per_pipe;

	/* Bit n == 1 means Queue n is available for KFD */
	DECLARE_BITMAP(queue_bitmap, KGD_MAX_QUEUES);

	/* Doorbell assignments (SOC15 and later chips only). Only
	 * specific doorbells are routed to each SDMA engine. Others
	 * are routed to IH and VCN. They are not usable by the CP.
	 *
	 * Any doorbell number D that satisfies the following condition
	 * is reserved: (D & reserved_doorbell_mask) == reserved_doorbell_val
	 *
	 * KFD currently uses 1024 (= 0x3ff) doorbells per process. If
	 * doorbells 0x0e0-0x0ff and 0x2e0-0x2ff are reserved, that means
	 * mask would be set to 0x1e0 and val set to 0x0e0.
	 */
	unsigned int sdma_doorbell[2][8];
	unsigned int reserved_doorbell_mask;
	unsigned int reserved_doorbell_val;

	/* Base address of doorbell aperture. */
	phys_addr_t doorbell_physical_address;

	/* Size in bytes of doorbell aperture. */
	size_t doorbell_aperture_size;

	/* Number of bytes at start of aperture reserved for KGD. */
	size_t doorbell_start_offset;

	/* GPUVM address space size in bytes */
	uint64_t gpuvm_size;

	/* Minor device number of the render node */
	int drm_render_minor;
};

struct tile_config {
	uint32_t *tile_config_ptr;
	uint32_t *macro_tile_config_ptr;
	uint32_t num_tile_configs;
	uint32_t num_macro_tile_configs;

	uint32_t gb_addr_config;
	uint32_t num_banks;
	uint32_t num_ranks;
};

#define KFD_MAX_NUM_OF_QUEUES_PER_DEVICE_DEFAULT 4096

/*
 * Allocation flag domains
 * NOTE: This must match the corresponding definitions in kfd_ioctl.h.
 */
#define ALLOC_MEM_FLAGS_VRAM		(1 << 0)
#define ALLOC_MEM_FLAGS_GTT		(1 << 1)
#define ALLOC_MEM_FLAGS_USERPTR		(1 << 2) /* TODO */
#define ALLOC_MEM_FLAGS_DOORBELL	(1 << 3) /* TODO */

/*
 * Allocation flags attributes/access options.
 * NOTE: This must match the corresponding definitions in kfd_ioctl.h.
 */
#define ALLOC_MEM_FLAGS_WRITABLE	(1 << 31)
#define ALLOC_MEM_FLAGS_EXECUTABLE	(1 << 30)
#define ALLOC_MEM_FLAGS_PUBLIC		(1 << 29)
#define ALLOC_MEM_FLAGS_NO_SUBSTITUTE	(1 << 28) /* TODO */
#define ALLOC_MEM_FLAGS_AQL_QUEUE_MEM	(1 << 27)
#define ALLOC_MEM_FLAGS_COHERENT	(1 << 26) /* For GFXv9 or later */

/**
 * struct kfd2kgd_calls
 *
 * @init_gtt_mem_allocation: Allocate a buffer on the gart aperture.
 * The buffer can be used for mqds, hpds, kernel queue, fence and runlists
 *
 * @free_gtt_mem: Frees a buffer that was allocated on the gart aperture
 *
 * @get_local_mem_info: Retrieves information about GPU local memory
 *
 * @get_gpu_clock_counter: Retrieves GPU clock counter
 *
 * @get_max_engine_clock_in_mhz: Retrieves maximum GPU clock in MHz
 *
 * @alloc_pasid: Allocate a PASID
 * @free_pasid: Free a PASID
 *
 * @program_sh_mem_settings: A function that should initiate the memory
 * properties such as main aperture memory type (cache / non cached) and
 * secondary aperture base address, size and memory type.
 * This function is used only for no cp scheduling mode.
 *
 * @set_pasid_vmid_mapping: Exposes pasid/vmid pair to the H/W for no cp
 * scheduling mode. Only used for no cp scheduling mode.
 *
 * @hqd_load: Loads the mqd structure to a H/W hqd slot. used only for no cp
 * sceduling mode.
 *
 * @hqd_sdma_load: Loads the SDMA mqd structure to a H/W SDMA hqd slot.
 * used only for no HWS mode.
 *
 * @hqd_dump: Dumps CPC HQD registers to an array of address-value pairs.
 * Array is allocated with kmalloc, needs to be freed with kfree by caller.
 *
 * @hqd_sdma_dump: Dumps SDMA HQD registers to an array of address-value pairs.
 * Array is allocated with kmalloc, needs to be freed with kfree by caller.
 *
 * @hqd_is_occupies: Checks if a hqd slot is occupied.
 *
 * @hqd_destroy: Destructs and preempts the queue assigned to that hqd slot.
 *
 * @hqd_sdma_is_occupied: Checks if an SDMA hqd slot is occupied.
 *
 * @hqd_sdma_destroy: Destructs and preempts the SDMA queue assigned to that
 * SDMA hqd slot.
 *
 * @get_fw_version: Returns FW versions from the header
 *
 * @set_scratch_backing_va: Sets VA for scratch backing memory of a VMID.
 * Only used for no cp scheduling mode
 *
 * @get_tile_config: Returns GPU-specific tiling mode information
 *
 * @get_cu_info: Retrieves activated cu info
 *
 * @get_vram_usage: Returns current VRAM usage
 *
 * @create_process_vm: Create a VM address space for a given process and GPU
 *
 * @destroy_process_vm: Destroy a VM
 *
 * @get_process_page_dir: Get physical address of a VM page directory
 *
 * @set_vm_context_page_table_base: Program page table base for a VMID
 *
 * @alloc_memory_of_gpu: Allocate GPUVM memory
 *
 * @free_memory_of_gpu: Free GPUVM memory
 *
 * @map_memory_to_gpu: Map GPUVM memory into a specific VM address
 * space. Allocates and updates page tables and page directories as
 * needed. This function may return before all page table updates have
 * completed. This allows multiple map operations (on multiple GPUs)
 * to happen concurrently. Use sync_memory to synchronize with all
 * pending updates.
 *
 * @unmap_memor_to_gpu: Unmap GPUVM memory from a specific VM address space
 *
 * @sync_memory: Wait for pending page table updates to complete
 *
 * @map_gtt_bo_to_kernel: Map a GTT BO for kernel access
 * Pins the BO, maps it to kernel address space. Such BOs are never evicted.
 * The kernel virtual address remains valid until the BO is freed.
 *
 * @restore_process_bos: Restore all BOs that belong to the
 * process. This is intended for restoring memory mappings after a TTM
 * eviction.
 *
 * @invalidate_tlbs: Invalidate TLBs for a specific PASID
 *
 * @invalidate_tlbs_vmid: Invalidate TLBs for a specific VMID
 *
 * @submit_ib: Submits an IB to the engine specified by inserting the
 * IB to the corresponding ring (ring type). The IB is executed with the
 * specified VMID in a user mode context.
 *
 * @get_vm_fault_info: Return information about a recent VM fault on
 * GFXv7 and v8. If multiple VM faults occurred since the last call of
 * this function, it will return information about the first of those
 * faults. On GFXv9 VM fault information is fully contained in the IH
 * packet and this function is not needed.
 *
 * @read_vmid_from_vmfault_reg: On Hawaii the VMID is not set in the
 * IH ring entry. This function allows the KFD ISR to get the VMID
 * from the fault status register as early as possible.
 *
 * @gpu_recover: let kgd reset gpu after kfd detect CPC hang
 *
 * @set_compute_idle: Indicates that compute is idle on a device. This
 * can be used to change power profiles depending on compute activity.
 *
 * @get_hive_id: Returns hive id of current  device,  0 if xgmi is not enabled
 *
 * This structure contains function pointers to services that the kgd driver
 * provides to amdkfd driver.
 *
 */
struct kfd2kgd_calls {
	int (*init_gtt_mem_allocation)(struct kgd_dev *kgd, size_t size,
					void **mem_obj, uint64_t *gpu_addr,
					void **cpu_ptr, bool mqd_gfx9);

	void (*free_gtt_mem)(struct kgd_dev *kgd, void *mem_obj);

	void (*get_local_mem_info)(struct kgd_dev *kgd,
			struct kfd_local_mem_info *mem_info);
	uint64_t (*get_gpu_clock_counter)(struct kgd_dev *kgd);

	uint32_t (*get_max_engine_clock_in_mhz)(struct kgd_dev *kgd);

	int (*alloc_pasid)(unsigned int bits);
	void (*free_pasid)(unsigned int pasid);

	/* Register access functions */
	void (*program_sh_mem_settings)(struct kgd_dev *kgd, uint32_t vmid,
			uint32_t sh_mem_config,	uint32_t sh_mem_ape1_base,
			uint32_t sh_mem_ape1_limit, uint32_t sh_mem_bases);

	int (*set_pasid_vmid_mapping)(struct kgd_dev *kgd, unsigned int pasid,
					unsigned int vmid);

	int (*init_interrupts)(struct kgd_dev *kgd, uint32_t pipe_id);

	int (*hqd_load)(struct kgd_dev *kgd, void *mqd, uint32_t pipe_id,
			uint32_t queue_id, uint32_t __user *wptr,
			uint32_t wptr_shift, uint32_t wptr_mask,
			struct mm_struct *mm);

	int (*hqd_sdma_load)(struct kgd_dev *kgd, void *mqd,
			     uint32_t __user *wptr, struct mm_struct *mm);

	int (*hqd_dump)(struct kgd_dev *kgd,
			uint32_t pipe_id, uint32_t queue_id,
			uint32_t (**dump)[2], uint32_t *n_regs);

	int (*hqd_sdma_dump)(struct kgd_dev *kgd,
			     uint32_t engine_id, uint32_t queue_id,
			     uint32_t (**dump)[2], uint32_t *n_regs);

	bool (*hqd_is_occupied)(struct kgd_dev *kgd, uint64_t queue_address,
				uint32_t pipe_id, uint32_t queue_id);

	int (*hqd_destroy)(struct kgd_dev *kgd, void *mqd, uint32_t reset_type,
				unsigned int timeout, uint32_t pipe_id,
				uint32_t queue_id);

	bool (*hqd_sdma_is_occupied)(struct kgd_dev *kgd, void *mqd);

	int (*hqd_sdma_destroy)(struct kgd_dev *kgd, void *mqd,
				unsigned int timeout);

	int (*address_watch_disable)(struct kgd_dev *kgd);
	int (*address_watch_execute)(struct kgd_dev *kgd,
					unsigned int watch_point_id,
					uint32_t cntl_val,
					uint32_t addr_hi,
					uint32_t addr_lo);
	int (*wave_control_execute)(struct kgd_dev *kgd,
					uint32_t gfx_index_val,
					uint32_t sq_cmd);
	uint32_t (*address_watch_get_offset)(struct kgd_dev *kgd,
					unsigned int watch_point_id,
					unsigned int reg_offset);
	bool (*get_atc_vmid_pasid_mapping_valid)(
					struct kgd_dev *kgd,
					uint8_t vmid);
	uint16_t (*get_atc_vmid_pasid_mapping_pasid)(
					struct kgd_dev *kgd,
					uint8_t vmid);

	uint16_t (*get_fw_version)(struct kgd_dev *kgd,
				enum kgd_engine_type type);
	void (*set_scratch_backing_va)(struct kgd_dev *kgd,
				uint64_t va, uint32_t vmid);
	int (*get_tile_config)(struct kgd_dev *kgd, struct tile_config *config);

	void (*get_cu_info)(struct kgd_dev *kgd,
			struct kfd_cu_info *cu_info);
	uint64_t (*get_vram_usage)(struct kgd_dev *kgd);

	int (*create_process_vm)(struct kgd_dev *kgd, unsigned int pasid, void **vm,
			void **process_info, struct dma_fence **ef);
	int (*acquire_process_vm)(struct kgd_dev *kgd, struct file *filp,
			unsigned int pasid, void **vm, void **process_info,
			struct dma_fence **ef);
	void (*destroy_process_vm)(struct kgd_dev *kgd, void *vm);
	void (*release_process_vm)(struct kgd_dev *kgd, void *vm);
	uint64_t (*get_process_page_dir)(void *vm);
	void (*set_vm_context_page_table_base)(struct kgd_dev *kgd,
			uint32_t vmid, uint64_t page_table_base);
	int (*alloc_memory_of_gpu)(struct kgd_dev *kgd, uint64_t va,
			uint64_t size, void *vm,
			struct kgd_mem **mem, uint64_t *offset,
			uint32_t flags);
	int (*free_memory_of_gpu)(struct kgd_dev *kgd, struct kgd_mem *mem);
	int (*map_memory_to_gpu)(struct kgd_dev *kgd, struct kgd_mem *mem,
			void *vm);
	int (*unmap_memory_to_gpu)(struct kgd_dev *kgd, struct kgd_mem *mem,
			void *vm);
	int (*sync_memory)(struct kgd_dev *kgd, struct kgd_mem *mem, bool intr);
	int (*map_gtt_bo_to_kernel)(struct kgd_dev *kgd, struct kgd_mem *mem,
			void **kptr, uint64_t *size);
	int (*restore_process_bos)(void *process_info, struct dma_fence **ef);

	int (*invalidate_tlbs)(struct kgd_dev *kgd, uint16_t pasid);
	int (*invalidate_tlbs_vmid)(struct kgd_dev *kgd, uint16_t vmid);

	int (*submit_ib)(struct kgd_dev *kgd, enum kgd_engine_type engine,
			uint32_t vmid, uint64_t gpu_addr,
			uint32_t *ib_cmd, uint32_t ib_len);

	int (*get_vm_fault_info)(struct kgd_dev *kgd,
			struct kfd_vm_fault_info *info);
	uint32_t (*read_vmid_from_vmfault_reg)(struct kgd_dev *kgd);

	void (*gpu_recover)(struct kgd_dev *kgd);

	void (*set_compute_idle)(struct kgd_dev *kgd, bool idle);

	uint64_t (*get_hive_id)(struct kgd_dev *kgd);

};

/**
 * struct kgd2kfd_calls
 *
 * @exit: Notifies amdkfd that kgd module is unloaded
 *
 * @probe: Notifies amdkfd about a probe done on a device in the kgd driver.
 *
 * @device_init: Initialize the newly probed device (if it is a device that
 * amdkfd supports)
 *
 * @device_exit: Notifies amdkfd about a removal of a kgd device
 *
 * @suspend: Notifies amdkfd about a suspend action done to a kgd device
 *
 * @resume: Notifies amdkfd about a resume action done to a kgd device
 *
 * @quiesce_mm: Quiesce all user queue access to specified MM address space
 *
 * @resume_mm: Resume user queue access to specified MM address space
 *
 * @schedule_evict_and_restore_process: Schedules work queue that will prepare
 * for safe eviction of KFD BOs that belong to the specified process.
 *
 * @pre_reset: Notifies amdkfd that amdgpu about to reset the gpu
 *
 * @post_reset: Notify amdkfd that amgpu successfully reseted the gpu
 *
 * This structure contains function callback pointers so the kgd driver
 * will notify to the amdkfd about certain status changes.
 *
 */
struct kgd2kfd_calls {
	void (*exit)(void);
	struct kfd_dev* (*probe)(struct kgd_dev *kgd, struct pci_dev *pdev,
		const struct kfd2kgd_calls *f2g);
	bool (*device_init)(struct kfd_dev *kfd,
			const struct kgd2kfd_shared_resources *gpu_resources);
	void (*device_exit)(struct kfd_dev *kfd);
	void (*interrupt)(struct kfd_dev *kfd, const void *ih_ring_entry);
	void (*suspend)(struct kfd_dev *kfd);
	int (*resume)(struct kfd_dev *kfd);
	int (*quiesce_mm)(struct mm_struct *mm);
	int (*resume_mm)(struct mm_struct *mm);
	int (*schedule_evict_and_restore_process)(struct mm_struct *mm,
			struct dma_fence *fence);
	int  (*pre_reset)(struct kfd_dev *kfd);
	int  (*post_reset)(struct kfd_dev *kfd);
};

int kgd2kfd_init(unsigned interface_version,
		const struct kgd2kfd_calls **g2f);

#endif	/* KGD_KFD_INTERFACE_H_INCLUDED */