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

/*
 * Copyright 2016 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.
 *
 * Authors: Christian König
 */

#include <drm/ttm/ttm_range_manager.h>

#include "amdgpu.h"

static inline struct amdgpu_gtt_mgr *
to_gtt_mgr(struct ttm_resource_manager *man)
{ … }

/**
 * DOC: mem_info_gtt_total
 *
 * The amdgpu driver provides a sysfs API for reporting current total size of
 * the GTT.
 * The file mem_info_gtt_total is used for this, and returns the total size of
 * the GTT block, in bytes
 */
static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{ … }

/**
 * DOC: mem_info_gtt_used
 *
 * The amdgpu driver provides a sysfs API for reporting current total amount of
 * used GTT.
 * The file mem_info_gtt_used is used for this, and returns the current used
 * size of the GTT block, in bytes
 */
static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
					     struct device_attribute *attr,
					     char *buf)
{ … }

static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
	           amdgpu_mem_info_gtt_total_show, NULL);
static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
	           amdgpu_mem_info_gtt_used_show, NULL);

static struct attribute *amdgpu_gtt_mgr_attributes[] = …;

const struct attribute_group amdgpu_gtt_mgr_attr_group = …;

/**
 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
 *
 * @res: the mem object to check
 *
 * Check if a mem object has already address space allocated.
 */
bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
{ … }

/**
 * amdgpu_gtt_mgr_new - allocate a new node
 *
 * @man: TTM memory type manager
 * @tbo: TTM BO we need this range for
 * @place: placement flags and restrictions
 * @res: the resulting mem object
 *
 * Dummy, allocate the node but no space for it yet.
 */
static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
			      struct ttm_buffer_object *tbo,
			      const struct ttm_place *place,
			      struct ttm_resource **res)
{ … }

/**
 * amdgpu_gtt_mgr_del - free ranges
 *
 * @man: TTM memory type manager
 * @res: TTM memory object
 *
 * Free the allocated GTT again.
 */
static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
			       struct ttm_resource *res)
{ … }

/**
 * amdgpu_gtt_mgr_recover - re-init gart
 *
 * @mgr: amdgpu_gtt_mgr pointer
 *
 * Re-init the gart for each known BO in the GTT.
 */
void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
{ … }

/**
 * amdgpu_gtt_mgr_intersects - test for intersection
 *
 * @man: Our manager object
 * @res: The resource to test
 * @place: The place for the new allocation
 * @size: The size of the new allocation
 *
 * Simplified intersection test, only interesting if we need GART or not.
 */
static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
				      struct ttm_resource *res,
				      const struct ttm_place *place,
				      size_t size)
{ … }

/**
 * amdgpu_gtt_mgr_compatible - test for compatibility
 *
 * @man: Our manager object
 * @res: The resource to test
 * @place: The place for the new allocation
 * @size: The size of the new allocation
 *
 * Simplified compatibility test.
 */
static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
				      struct ttm_resource *res,
				      const struct ttm_place *place,
				      size_t size)
{ … }

/**
 * amdgpu_gtt_mgr_debug - dump VRAM table
 *
 * @man: TTM memory type manager
 * @printer: DRM printer to use
 *
 * Dump the table content using printk.
 */
static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
				 struct drm_printer *printer)
{ … }

static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = …;

/**
 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
 *
 * @adev: amdgpu_device pointer
 * @gtt_size: maximum size of GTT
 *
 * Allocate and initialize the GTT manager.
 */
int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
{ … }

/**
 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
 *
 * @adev: amdgpu_device pointer
 *
 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
 * allocated inside it.
 */
void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
{ … }