drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c - linux - Git at Google

 /*
  * 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 "amdgpu.h"

 static inline struct amdgpu_gtt_mgr *to_gtt_mgr(struct ttm_resource_manager *man)
 {
 	return container_of(man, struct amdgpu_gtt_mgr, manager);
 }

 struct amdgpu_gtt_node {
 	struct drm_mm_node node;
 	struct ttm_buffer_object *tbo;
 };

 /**
  * 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)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = drm_to_adev(ddev);
 	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);

 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 			man->size * PAGE_SIZE);
 }

 /**
  * 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)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = drm_to_adev(ddev);
 	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);

 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 			amdgpu_gtt_mgr_usage(man));
 }

 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 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)
 {
 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
 	struct ttm_resource_manager *man = &mgr->manager;
 	uint64_t start, size;
 	int ret;

 	man->use_tt = true;
 	man->func = &amdgpu_gtt_mgr_func;

 	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);

 	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
 	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
 	drm_mm_init(&mgr->mm, start, size);
 	spin_lock_init(&mgr->lock);
 	atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT);

 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
 		return ret;
 	}
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
 		return ret;
 	}

 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
 	ttm_resource_manager_set_used(man, true);
 	return 0;
 }

 /**
  * 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)
 {
 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
 	struct ttm_resource_manager *man = &mgr->manager;
 	int ret;

 	ttm_resource_manager_set_used(man, false);

 	ret = ttm_resource_manager_force_list_clean(&adev->mman.bdev, man);
 	if (ret)
 		return;

 	spin_lock(&mgr->lock);
 	drm_mm_takedown(&mgr->mm);
 	spin_unlock(&mgr->lock);

 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);

 	ttm_resource_manager_cleanup(man);
 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
 }

 /**
  * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
  *
  * @mem: 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 *mem)
 {
 	return mem->mm_node != NULL;
 }

 /**
  * 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
  * @mem: 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 *mem)
 {
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
 	struct amdgpu_gtt_node *node;
 	int r;

 	spin_lock(&mgr->lock);
 	if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
 	    atomic64_read(&mgr->available) < mem->num_pages) {
 		spin_unlock(&mgr->lock);
 		return -ENOSPC;
 	}
 	atomic64_sub(mem->num_pages, &mgr->available);
 	spin_unlock(&mgr->lock);

 	if (!place->lpfn) {
 		mem->mm_node = NULL;
 		mem->start = AMDGPU_BO_INVALID_OFFSET;
 		return 0;
 	}

 	node = kzalloc(sizeof(*node), GFP_KERNEL);
 	if (!node) {
 		r = -ENOMEM;
 		goto err_out;
 	}

 	node->tbo = tbo;

 	spin_lock(&mgr->lock);
 	r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
 					mem->page_alignment, 0, place->fpfn,
 					place->lpfn, DRM_MM_INSERT_BEST);
 	spin_unlock(&mgr->lock);

 	if (unlikely(r))
 		goto err_free;

 	mem->mm_node = node;
 	mem->start = node->node.start;

 	return 0;

 err_free:
 	kfree(node);

 err_out:
 	atomic64_add(mem->num_pages, &mgr->available);

 	return r;
 }

 /**
  * amdgpu_gtt_mgr_del - free ranges
  *
  * @man: TTM memory type manager
  * @mem: TTM memory object
  *
  * Free the allocated GTT again.
  */
 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
 			       struct ttm_resource *mem)
 {
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
 	struct amdgpu_gtt_node *node = mem->mm_node;

 	if (node) {
 		spin_lock(&mgr->lock);
 		drm_mm_remove_node(&node->node);
 		spin_unlock(&mgr->lock);
 		kfree(node);
 	}

 	atomic64_add(mem->num_pages, &mgr->available);
 }

 /**
  * amdgpu_gtt_mgr_usage - return usage of GTT domain
  *
  * @man: TTM memory type manager
  *
  * Return how many bytes are used in the GTT domain
  */
 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
 {
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
 	s64 result = man->size - atomic64_read(&mgr->available);

 	return (result > 0 ? result : 0) * PAGE_SIZE;
 }

 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
 {
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
 	struct amdgpu_gtt_node *node;
 	struct drm_mm_node *mm_node;
 	int r = 0;

 	spin_lock(&mgr->lock);
 	drm_mm_for_each_node(mm_node, &mgr->mm) {
 		node = container_of(mm_node, struct amdgpu_gtt_node, node);
 		r = amdgpu_ttm_recover_gart(node->tbo);
 		if (r)
 			break;
 	}
 	spin_unlock(&mgr->lock);

 	return r;
 }

 /**
  * 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)
 {
 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);

 	spin_lock(&mgr->lock);
 	drm_mm_print(&mgr->mm, printer);
 	spin_unlock(&mgr->lock);

 	drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
 		   man->size, (u64)atomic64_read(&mgr->available),
 		   amdgpu_gtt_mgr_usage(man) >> 20);
 }

 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
 	.alloc = amdgpu_gtt_mgr_new,
 	.free = amdgpu_gtt_mgr_del,
 	.debug = amdgpu_gtt_mgr_debug
 };
	/*
	* 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 "amdgpu.h"

	static inline struct amdgpu_gtt_mgr to_gtt_mgr(struct ttm_resource_manager man)
	{
	return container_of(man, struct amdgpu_gtt_mgr, manager);
	}

	struct amdgpu_gtt_node {
	struct drm_mm_node node;
	struct ttm_buffer_object *tbo;
	};

	/**
	* 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)
	{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = drm_to_adev(ddev);
	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);

	return snprintf(buf, PAGE_SIZE, "%llu\n",
	man->size * PAGE_SIZE);
	}

	/**
	* 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)
	{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = drm_to_adev(ddev);
	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);

	return snprintf(buf, PAGE_SIZE, "%llu\n",
	amdgpu_gtt_mgr_usage(man));
	}

	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 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)
	{
	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
	struct ttm_resource_manager *man = &mgr->manager;
	uint64_t start, size;
	int ret;

	man->use_tt = true;
	man->func = &amdgpu_gtt_mgr_func;

	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);

	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
	drm_mm_init(&mgr->mm, start, size);
	spin_lock_init(&mgr->lock);
	atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT);

	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
	if (ret) {
	DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
	return ret;
	}
	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
	if (ret) {
	DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
	return ret;
	}

	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
	ttm_resource_manager_set_used(man, true);
	return 0;
	}

	/**
	* 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)
	{
	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
	struct ttm_resource_manager *man = &mgr->manager;
	int ret;

	ttm_resource_manager_set_used(man, false);

	ret = ttm_resource_manager_force_list_clean(&adev->mman.bdev, man);
	if (ret)
	return;

	spin_lock(&mgr->lock);
	drm_mm_takedown(&mgr->mm);
	spin_unlock(&mgr->lock);

	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);

	ttm_resource_manager_cleanup(man);
	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
	}

	/**
	* amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
	*
	* @mem: 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 *mem)
	{
	return mem->mm_node != NULL;
	}

	/**
	* 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
	* @mem: 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 *mem)
	{
	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
	struct amdgpu_gtt_node *node;
	int r;

	spin_lock(&mgr->lock);
	if ((&tbo->mem == mem \|\| tbo->mem.mem_type != TTM_PL_TT) &&
	atomic64_read(&mgr->available) < mem->num_pages) {
	spin_unlock(&mgr->lock);
	return -ENOSPC;
	}
	atomic64_sub(mem->num_pages, &mgr->available);
	spin_unlock(&mgr->lock);

	if (!place->lpfn) {
	mem->mm_node = NULL;
	mem->start = AMDGPU_BO_INVALID_OFFSET;
	return 0;
	}

	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (!node) {
	r = -ENOMEM;
	goto err_out;
	}

	node->tbo = tbo;

	spin_lock(&mgr->lock);
	r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
	mem->page_alignment, 0, place->fpfn,
	place->lpfn, DRM_MM_INSERT_BEST);
	spin_unlock(&mgr->lock);

	if (unlikely(r))
	goto err_free;

	mem->mm_node = node;
	mem->start = node->node.start;

	return 0;

	err_free:
	kfree(node);

	err_out:
	atomic64_add(mem->num_pages, &mgr->available);

	return r;
	}

	/**
	* amdgpu_gtt_mgr_del - free ranges
	*
	* @man: TTM memory type manager
	* @mem: TTM memory object
	*
	* Free the allocated GTT again.
	*/
	static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
	struct ttm_resource *mem)
	{
	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
	struct amdgpu_gtt_node *node = mem->mm_node;

	if (node) {
	spin_lock(&mgr->lock);
	drm_mm_remove_node(&node->node);
	spin_unlock(&mgr->lock);
	kfree(node);
	}

	atomic64_add(mem->num_pages, &mgr->available);
	}

	/**
	* amdgpu_gtt_mgr_usage - return usage of GTT domain
	*
	* @man: TTM memory type manager
	*
	* Return how many bytes are used in the GTT domain
	*/
	uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
	{
	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
	s64 result = man->size - atomic64_read(&mgr->available);

	return (result > 0 ? result : 0) * PAGE_SIZE;
	}

	int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
	{
	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
	struct amdgpu_gtt_node *node;
	struct drm_mm_node *mm_node;
	int r = 0;

	spin_lock(&mgr->lock);
	drm_mm_for_each_node(mm_node, &mgr->mm) {
	node = container_of(mm_node, struct amdgpu_gtt_node, node);
	r = amdgpu_ttm_recover_gart(node->tbo);
	if (r)
	break;
	}
	spin_unlock(&mgr->lock);

	return r;
	}

	/**
	* 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)
	{
	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);

	spin_lock(&mgr->lock);
	drm_mm_print(&mgr->mm, printer);
	spin_unlock(&mgr->lock);

	drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
	man->size, (u64)atomic64_read(&mgr->available),
	amdgpu_gtt_mgr_usage(man) >> 20);
	}

	static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
	.alloc = amdgpu_gtt_mgr_new,
	.free = amdgpu_gtt_mgr_del,
	.debug = amdgpu_gtt_mgr_debug
	};