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

/*
 * Copyright 2019 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_vm.h"
#include "amdgpu_object.h"
#include "amdgpu_trace.h"

/**
 * amdgpu_vm_cpu_map_table - make sure new PDs/PTs are kmapped
 *
 * @table: newly allocated or validated PD/PT
 */
static int amdgpu_vm_cpu_map_table(struct amdgpu_bo_vm *table)
{ … }

/**
 * amdgpu_vm_cpu_prepare - prepare page table update with the CPU
 *
 * @p: see amdgpu_vm_update_params definition
 * @resv: reservation object with embedded fence
 * @sync_mode: synchronization mode
 *
 * Returns:
 * Negativ errno, 0 for success.
 */
static int amdgpu_vm_cpu_prepare(struct amdgpu_vm_update_params *p,
				 struct dma_resv *resv,
				 enum amdgpu_sync_mode sync_mode)
{ … }

/**
 * amdgpu_vm_cpu_update - helper to update page tables via CPU
 *
 * @p: see amdgpu_vm_update_params definition
 * @vmbo: PD/PT to update
 * @pe: byte offset of the PDE/PTE, relative to start of PDB/PTB
 * @addr: dst addr to write into pe
 * @count: number of page entries to update
 * @incr: increase next addr by incr bytes
 * @flags: hw access flags
 *
 * Write count number of PT/PD entries directly.
 */
static int amdgpu_vm_cpu_update(struct amdgpu_vm_update_params *p,
				struct amdgpu_bo_vm *vmbo, uint64_t pe,
				uint64_t addr, unsigned count, uint32_t incr,
				uint64_t flags)
{ … }

/**
 * amdgpu_vm_cpu_commit - commit page table update to the HW
 *
 * @p: see amdgpu_vm_update_params definition
 * @fence: unused
 *
 * Make sure that the hardware sees the page table updates.
 */
static int amdgpu_vm_cpu_commit(struct amdgpu_vm_update_params *p,
				struct dma_fence **fence)
{ … }

const struct amdgpu_vm_update_funcs amdgpu_vm_cpu_funcs = …;