linux/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c

// SPDX-License-Identifier: MIT
/*
 * Copyright 2023 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.
 *
 */

#include "amdgpu.h"
#include "amdgpu_seq64.h"

#include <drm/drm_exec.h>

/**
 * DOC: amdgpu_seq64
 *
 * amdgpu_seq64 allocates a 64bit memory on each request in sequence order.
 * seq64 driver is required for user queue fence memory allocation, TLB
 * counters and VM updates. It has maximum count of 32768 64 bit slots.
 */

/**
 * amdgpu_seq64_get_va_base - Get the seq64 va base address
 *
 * @adev: amdgpu_device pointer
 *
 * Returns:
 * va base address on success
 */
static inline u64 amdgpu_seq64_get_va_base(struct amdgpu_device *adev)
{ … }

/**
 * amdgpu_seq64_map - Map the seq64 memory to VM
 *
 * @adev: amdgpu_device pointer
 * @vm: vm pointer
 * @bo_va: bo_va pointer
 *
 * Map the seq64 memory to the given VM.
 *
 * Returns:
 * 0 on success or a negative error code on failure
 */
int amdgpu_seq64_map(struct amdgpu_device *adev, struct amdgpu_vm *vm,
		     struct amdgpu_bo_va **bo_va)
{ … }

/**
 * amdgpu_seq64_unmap - Unmap the seq64 memory
 *
 * @adev: amdgpu_device pointer
 * @fpriv: DRM file private
 *
 * Unmap the seq64 memory from the given VM.
 */
void amdgpu_seq64_unmap(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv)
{ … }

/**
 * amdgpu_seq64_alloc - Allocate a 64 bit memory
 *
 * @adev: amdgpu_device pointer
 * @va: VA to access the seq in process address space
 * @cpu_addr: CPU address to access the seq
 *
 * Alloc a 64 bit memory from seq64 pool.
 *
 * Returns:
 * 0 on success or a negative error code on failure
 */
int amdgpu_seq64_alloc(struct amdgpu_device *adev, u64 *va, u64 **cpu_addr)
{ … }

/**
 * amdgpu_seq64_free - Free the given 64 bit memory
 *
 * @adev: amdgpu_device pointer
 * @va: gpu start address to be freed
 *
 * Free the given 64 bit memory from seq64 pool.
 */
void amdgpu_seq64_free(struct amdgpu_device *adev, u64 va)
{ … }

/**
 * amdgpu_seq64_fini - Cleanup seq64 driver
 *
 * @adev: amdgpu_device pointer
 *
 * Free the memory space allocated for seq64.
 *
 */
void amdgpu_seq64_fini(struct amdgpu_device *adev)
{ … }

/**
 * amdgpu_seq64_init - Initialize seq64 driver
 *
 * @adev: amdgpu_device pointer
 *
 * Allocate the required memory space for seq64.
 *
 * Returns:
 * 0 on success or a negative error code on failure
 */
int amdgpu_seq64_init(struct amdgpu_device *adev)
{ … }