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 <drm/drmP.h>
 #include "amdgpu.h"

 struct amdgpu_gtt_mgr {
 	struct drm_mm mm;
 	spinlock_t lock;
 	atomic64_t available;
 };

 /**
  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
  *
  * @man: TTM memory type manager
  * @p_size: maximum size of GTT
  *
  * Allocate and initialize the GTT manager.
  */
 static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
 			       unsigned long p_size)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_gtt_mgr *mgr;
 	uint64_t start, size;

 	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 	if (!mgr)
 		return -ENOMEM;

 	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
 	size = (adev->mc.gart_size >> PAGE_SHIFT) - start;
 	drm_mm_init(&mgr->mm, start, size);
 	spin_lock_init(&mgr->lock);
 	atomic64_set(&mgr->available, p_size);
 	man->priv = mgr;
 	return 0;
 }

 /**
  * amdgpu_gtt_mgr_fini - free and destroy GTT manager
  *
  * @man: TTM memory type manager
  *
  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
  * allocated inside it.
  */
 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
 {
 	struct amdgpu_gtt_mgr *mgr = man->priv;

 	spin_lock(&mgr->lock);
 	if (!drm_mm_clean(&mgr->mm)) {
 		spin_unlock(&mgr->lock);
 		return -EBUSY;
 	}

 	drm_mm_takedown(&mgr->mm);
 	spin_unlock(&mgr->lock);
 	kfree(mgr);
 	man->priv = NULL;
 	return 0;
 }

 /**
  * amdgpu_gtt_mgr_is_allocated - 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_is_allocated(struct ttm_mem_reg *mem)
 {
 	struct drm_mm_node *node = mem->mm_node;

 	return (node->start != AMDGPU_BO_INVALID_OFFSET);
 }

 /**
  * amdgpu_gtt_mgr_alloc - allocate new ranges
  *
  * @man: TTM memory type manager
  * @tbo: TTM BO we need this range for
  * @place: placement flags and restrictions
  * @mem: the resulting mem object
  *
  * Allocate the address space for a node.
  */
 static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
 				struct ttm_buffer_object *tbo,
 				const struct ttm_place *place,
 				struct ttm_mem_reg *mem)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_gtt_mgr *mgr = man->priv;
 	struct drm_mm_node *node = mem->mm_node;
 	enum drm_mm_insert_mode mode;
 	unsigned long fpfn, lpfn;
 	int r;

 	if (amdgpu_gtt_mgr_is_allocated(mem))
 		return 0;

 	if (place)
 		fpfn = place->fpfn;
 	else
 		fpfn = 0;

 	if (place && place->lpfn)
 		lpfn = place->lpfn;
 	else
 		lpfn = adev->gart.num_cpu_pages;

 	mode = DRM_MM_INSERT_BEST;
 	if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
 		mode = DRM_MM_INSERT_HIGH;

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

 	if (!r)
 		mem->start = node->start;

 	return r;
 }

 /**
  * 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_mem_type_manager *man,
 			      struct ttm_buffer_object *tbo,
 			      const struct ttm_place *place,
 			      struct ttm_mem_reg *mem)
 {
 	struct amdgpu_gtt_mgr *mgr = man->priv;
 	struct drm_mm_node *node;
 	int r;

 	spin_lock(&mgr->lock);
 	if (atomic64_read(&mgr->available) < mem->num_pages) {
 		spin_unlock(&mgr->lock);
 		return 0;
 	}
 	atomic64_sub(mem->num_pages, &mgr->available);
 	spin_unlock(&mgr->lock);

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

 	node->start = AMDGPU_BO_INVALID_OFFSET;
 	node->size = mem->num_pages;
 	mem->mm_node = node;

 	if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
 		r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
 		if (unlikely(r)) {
 			kfree(node);
 			mem->mm_node = NULL;
 			r = 0;
 			goto err_out;
 		}
 	} else {
 		mem->start = node->start;
 	}

 	return 0;
 err_out:
 	atomic64_add(mem->num_pages, &mgr->available);

 	return r;
 }

 /**
  * amdgpu_gtt_mgr_del - free ranges
  *
  * @man: TTM memory type manager
  * @tbo: TTM BO we need this range for
  * @place: placement flags and restrictions
  * @mem: TTM memory object
  *
  * Free the allocated GTT again.
  */
 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
 			       struct ttm_mem_reg *mem)
 {
 	struct amdgpu_gtt_mgr *mgr = man->priv;
 	struct drm_mm_node *node = mem->mm_node;

 	if (!node)
 		return;

 	spin_lock(&mgr->lock);
 	if (node->start != AMDGPU_BO_INVALID_OFFSET)
 		drm_mm_remove_node(node);
 	spin_unlock(&mgr->lock);
 	atomic64_add(mem->num_pages, &mgr->available);

 	kfree(node);
 	mem->mm_node = NULL;
 }

 /**
  * 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_mem_type_manager *man)
 {
 	struct amdgpu_gtt_mgr *mgr = man->priv;

 	return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_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_mem_type_manager *man,
 				 struct drm_printer *printer)
 {
 	struct amdgpu_gtt_mgr *mgr = man->priv;

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

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

 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
 	.init = amdgpu_gtt_mgr_init,
 	.takedown = amdgpu_gtt_mgr_fini,
 	.get_node = amdgpu_gtt_mgr_new,
 	.put_node = 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 <drm/drmP.h>
	#include "amdgpu.h"

	struct amdgpu_gtt_mgr {
	struct drm_mm mm;
	spinlock_t lock;
	atomic64_t available;
	};

	/**
	* amdgpu_gtt_mgr_init - init GTT manager and DRM MM
	*
	* @man: TTM memory type manager
	* @p_size: maximum size of GTT
	*
	* Allocate and initialize the GTT manager.
	*/
	static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
	unsigned long p_size)
	{
	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
	struct amdgpu_gtt_mgr *mgr;
	uint64_t start, size;

	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
	if (!mgr)
	return -ENOMEM;

	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
	size = (adev->mc.gart_size >> PAGE_SHIFT) - start;
	drm_mm_init(&mgr->mm, start, size);
	spin_lock_init(&mgr->lock);
	atomic64_set(&mgr->available, p_size);
	man->priv = mgr;
	return 0;
	}

	/**
	* amdgpu_gtt_mgr_fini - free and destroy GTT manager
	*
	* @man: TTM memory type manager
	*
	* Destroy and free the GTT manager, returns -EBUSY if ranges are still
	* allocated inside it.
	*/
	static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
	{
	struct amdgpu_gtt_mgr *mgr = man->priv;

	spin_lock(&mgr->lock);
	if (!drm_mm_clean(&mgr->mm)) {
	spin_unlock(&mgr->lock);
	return -EBUSY;
	}

	drm_mm_takedown(&mgr->mm);
	spin_unlock(&mgr->lock);
	kfree(mgr);
	man->priv = NULL;
	return 0;
	}

	/**
	* amdgpu_gtt_mgr_is_allocated - 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_is_allocated(struct ttm_mem_reg *mem)
	{
	struct drm_mm_node *node = mem->mm_node;

	return (node->start != AMDGPU_BO_INVALID_OFFSET);
	}

	/**
	* amdgpu_gtt_mgr_alloc - allocate new ranges
	*
	* @man: TTM memory type manager
	* @tbo: TTM BO we need this range for
	* @place: placement flags and restrictions
	* @mem: the resulting mem object
	*
	* Allocate the address space for a node.
	*/
	static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
	struct ttm_buffer_object *tbo,
	const struct ttm_place *place,
	struct ttm_mem_reg *mem)
	{
	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
	struct amdgpu_gtt_mgr *mgr = man->priv;
	struct drm_mm_node *node = mem->mm_node;
	enum drm_mm_insert_mode mode;
	unsigned long fpfn, lpfn;
	int r;

	if (amdgpu_gtt_mgr_is_allocated(mem))
	return 0;

	if (place)
	fpfn = place->fpfn;
	else
	fpfn = 0;

	if (place && place->lpfn)
	lpfn = place->lpfn;
	else
	lpfn = adev->gart.num_cpu_pages;

	mode = DRM_MM_INSERT_BEST;
	if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
	mode = DRM_MM_INSERT_HIGH;

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

	if (!r)
	mem->start = node->start;

	return r;
	}

	/**
	* 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_mem_type_manager *man,
	struct ttm_buffer_object *tbo,
	const struct ttm_place *place,
	struct ttm_mem_reg *mem)
	{
	struct amdgpu_gtt_mgr *mgr = man->priv;
	struct drm_mm_node *node;
	int r;

	spin_lock(&mgr->lock);
	if (atomic64_read(&mgr->available) < mem->num_pages) {
	spin_unlock(&mgr->lock);
	return 0;
	}
	atomic64_sub(mem->num_pages, &mgr->available);
	spin_unlock(&mgr->lock);

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

	node->start = AMDGPU_BO_INVALID_OFFSET;
	node->size = mem->num_pages;
	mem->mm_node = node;

	if (place->fpfn \|\| place->lpfn \|\| place->flags & TTM_PL_FLAG_TOPDOWN) {
	r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
	if (unlikely(r)) {
	kfree(node);
	mem->mm_node = NULL;
	r = 0;
	goto err_out;
	}
	} else {
	mem->start = node->start;
	}

	return 0;
	err_out:
	atomic64_add(mem->num_pages, &mgr->available);

	return r;
	}

	/**
	* amdgpu_gtt_mgr_del - free ranges
	*
	* @man: TTM memory type manager
	* @tbo: TTM BO we need this range for
	* @place: placement flags and restrictions
	* @mem: TTM memory object
	*
	* Free the allocated GTT again.
	*/
	static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
	struct ttm_mem_reg *mem)
	{
	struct amdgpu_gtt_mgr *mgr = man->priv;
	struct drm_mm_node *node = mem->mm_node;

	if (!node)
	return;

	spin_lock(&mgr->lock);
	if (node->start != AMDGPU_BO_INVALID_OFFSET)
	drm_mm_remove_node(node);
	spin_unlock(&mgr->lock);
	atomic64_add(mem->num_pages, &mgr->available);

	kfree(node);
	mem->mm_node = NULL;
	}

	/**
	* 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_mem_type_manager *man)
	{
	struct amdgpu_gtt_mgr *mgr = man->priv;

	return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_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_mem_type_manager *man,
	struct drm_printer *printer)
	{
	struct amdgpu_gtt_mgr *mgr = man->priv;

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

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

	const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
	.init = amdgpu_gtt_mgr_init,
	.takedown = amdgpu_gtt_mgr_fini,
	.get_node = amdgpu_gtt_mgr_new,
	.put_node = amdgpu_gtt_mgr_del,
	.debug = amdgpu_gtt_mgr_debug
	};