path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * 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.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
#include <drm/drmP.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"

/*
 * GPUVM
 * GPUVM is similar to the legacy gart on older asics, however
 * rather than there being a single global gart table
 * for the entire GPU, there are multiple VM page tables active
 * at any given time.  The VM page tables can contain a mix
 * vram pages and system memory pages and system memory pages
 * can be mapped as snooped (cached system pages) or unsnooped
 * (uncached system pages).
 * Each VM has an ID associated with it and there is a page table
 * associated with each VMID.  When execting a command buffer,
 * the kernel tells the the ring what VMID to use for that command
 * buffer.  VMIDs are allocated dynamically as commands are submitted.
 * The userspace drivers maintain their own address space and the kernel
 * sets up their pages tables accordingly when they submit their
 * command buffers and a VMID is assigned.
 * Cayman/Trinity support up to 8 active VMs at any given time;
 * SI supports 16.
 */

/**
 * amdgpu_vm_num_pde - return the number of page directory entries
 *
 * @adev: amdgpu_device pointer
 *
 * Calculate the number of page directory entries (cayman+).
 */
static unsigned amdgpu_vm_num_pdes(struct amdgpu_device *adev)
{
	return adev->vm_manager.max_pfn >> amdgpu_vm_block_size;
}

/**
 * amdgpu_vm_directory_size - returns the size of the page directory in bytes
 *
 * @adev: amdgpu_device pointer
 *
 * Calculate the size of the page directory in bytes (cayman+).
 */
static unsigned amdgpu_vm_directory_size(struct amdgpu_device *adev)
{
	return AMDGPU_GPU_PAGE_ALIGN(amdgpu_vm_num_pdes(adev) * 8);
}

/**
 * amdgpu_vm_get_bos - add the vm BOs to a validation list
 *
 * @vm: vm providing the BOs
 * @head: head of validation list
 *
 * Add the page directory to the list of BOs to
 * validate for command submission (cayman+).
 */
struct amdgpu_bo_list_entry *amdgpu_vm_get_bos(struct amdgpu_device *adev,
					  struct amdgpu_vm *vm,
					  struct list_head *head)
{
	struct amdgpu_bo_list_entry *list;
	unsigned i, idx;

	mutex_lock(&vm->mutex);
	list = drm_malloc_ab(vm->max_pde_used + 2,
			     sizeof(struct amdgpu_bo_list_entry));
	if (!list) {
		mutex_unlock(&vm->mutex);
		return NULL;
	}

	/* add the vm page table to the list */
	list[0].robj = vm->page_directory;
	list[0].prefered_domains = AMDGPU_GEM_DOMAIN_VRAM;
	list[0].allowed_domains = AMDGPU_GEM_DOMAIN_VRAM;
	list[0].priority = 0;
	list[0].