drivers/gpu/drm/amd/amdgpu/amdgpu_vram_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_vram_mgr {
 	struct drm_mm mm;
 	spinlock_t lock;
 	atomic64_t usage;
 	atomic64_t vis_usage;
 };

 /**
  * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
  *
  * @man: TTM memory type manager
  * @p_size: maximum size of VRAM
  *
  * Allocate and initialize the VRAM manager.
  */
 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
 				unsigned long p_size)
 {
 	struct amdgpu_vram_mgr *mgr;

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

 	drm_mm_init(&mgr->mm, 0, p_size);
 	spin_lock_init(&mgr->lock);
 	man->priv = mgr;
 	return 0;
 }

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

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

 /**
  * amdgpu_vram_mgr_vis_size - Calculate visible node size
  *
  * @adev: amdgpu device structure
  * @node: MM node structure
  *
  * Calculate how many bytes of the MM node are inside visible VRAM
  */
 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
 				    struct drm_mm_node *node)
 {
 	uint64_t start = node->start << PAGE_SHIFT;
 	uint64_t end = (node->size + node->start) << PAGE_SHIFT;

 	if (start >= adev->gmc.visible_vram_size)
 		return 0;

 	return (end > adev->gmc.visible_vram_size ?
 		adev->gmc.visible_vram_size : end) - start;
 }

 /**
  * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
  *
  * @bo: &amdgpu_bo buffer object (must be in VRAM)
  *
  * Returns:
  * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
  */
 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	struct ttm_mem_reg *mem = &bo->tbo.mem;
 	struct drm_mm_node *nodes = mem->mm_node;
 	unsigned pages = mem->num_pages;
 	u64 usage;

 	if (amdgpu_gmc_vram_full_visible(&adev->gmc))
 		return amdgpu_bo_size(bo);

 	if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
 		return 0;

 	for (usage = 0; nodes && pages; pages -= nodes->size, nodes++)
 		usage += amdgpu_vram_mgr_vis_size(adev, nodes);

 	return usage;
 }

 /**
  * amdgpu_vram_mgr_virt_start - update virtual start address
  *
  * @mem: ttm_mem_reg to update
  * @node: just allocated node
  *
  * Calculate a virtual BO start address to easily check if everything is CPU
  * accessible.
  */
 static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem,
 				       struct drm_mm_node *node)
 {
 	unsigned long start;

 	start = node->start + node->size;
 	if (start > mem->num_pages)
 		start -= mem->num_pages;
 	else
 		start = 0;
 	mem->start = max(mem->start, start);
 }

 /**
  * amdgpu_vram_mgr_new - 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 VRAM for the given BO.
  */
 static int amdgpu_vram_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_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_vram_mgr *mgr = man->priv;
 	struct drm_mm *mm = &mgr->mm;
 	struct drm_mm_node *nodes;
 	enum drm_mm_insert_mode mode;
 	unsigned long lpfn, num_nodes, pages_per_node, pages_left;
 	uint64_t usage = 0, vis_usage = 0;
 	unsigned i;
 	int r;

 	lpfn = place->lpfn;
 	if (!lpfn)
 		lpfn = man->size;

 	if (place->flags & TTM_PL_FLAG_CONTIGUOUS ||
 	    amdgpu_vram_page_split == -1) {
 		pages_per_node = ~0ul;
 		num_nodes = 1;
 	} else {
 		pages_per_node = max((uint32_t)amdgpu_vram_page_split,
 				     mem->page_alignment);
 		num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
 	}

 	nodes = kvmalloc_array(num_nodes, sizeof(*nodes),
 			       GFP_KERNEL | __GFP_ZERO);
 	if (!nodes)
 		return -ENOMEM;

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

 	mem->start = 0;
 	pages_left = mem->num_pages;

 	spin_lock(&mgr->lock);
 	for (i = 0; pages_left >= pages_per_node; ++i) {
 		unsigned long pages = rounddown_pow_of_two(pages_left);

 		r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
 						pages_per_node, 0,
 						place->fpfn, lpfn,
 						mode);
 		if (unlikely(r))
 			break;

 		usage += nodes[i].size << PAGE_SHIFT;
 		vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
 		amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
 		pages_left -= pages;
 	}

 	for (; pages_left; ++i) {
 		unsigned long pages = min(pages_left, pages_per_node);
 		uint32_t alignment = mem->page_alignment;

 		if (pages == pages_per_node)
 			alignment = pages_per_node;

 		r = drm_mm_insert_node_in_range(mm, &nodes[i],
 						pages, alignment, 0,
 						place->fpfn, lpfn,
 						mode);
 		if (unlikely(r))
 			goto error;

 		usage += nodes[i].size << PAGE_SHIFT;
 		vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
 		amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
 		pages_left -= pages;
 	}
 	spin_unlock(&mgr->lock);

 	atomic64_add(usage, &mgr->usage);
 	atomic64_add(vis_usage, &mgr->vis_usage);

 	mem->mm_node = nodes;

 	return 0;

 error:
 	while (i--)
 		drm_mm_remove_node(&nodes[i]);
 	spin_unlock(&mgr->lock);

 	kvfree(nodes);
 	return r == -ENOSPC ? 0 : r;
 }

 /**
  * amdgpu_vram_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 VRAM again.
  */
 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
 				struct ttm_mem_reg *mem)
 {
 	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 	struct amdgpu_vram_mgr *mgr = man->priv;
 	struct drm_mm_node *nodes = mem->mm_node;
 	uint64_t usage = 0, vis_usage = 0;
 	unsigned pages = mem->num_pages;

 	if (!mem->mm_node)
 		return;

 	spin_lock(&mgr->lock);
 	while (pages) {
 		pages -= nodes->size;
 		drm_mm_remove_node(nodes);
 		usage += nodes->size << PAGE_SHIFT;
 		vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
 		++nodes;
 	}
 	spin_unlock(&mgr->lock);

 	atomic64_sub(usage, &mgr->usage);
 	atomic64_sub(vis_usage, &mgr->vis_usage);

 	kvfree(mem->mm_node);
 	mem->mm_node = NULL;
 }

 /**
  * amdgpu_vram_mgr_usage - how many bytes are used in this domain
  *
  * @man: TTM memory type manager
  *
  * Returns how many bytes are used in this domain.
  */
 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
 {
 	struct amdgpu_vram_mgr *mgr = man->priv;

 	return atomic64_read(&mgr->usage);
 }

 /**
  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
  *
  * @man: TTM memory type manager
  *
  * Returns how many bytes are used in the visible part of VRAM
  */
 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
 {
 	struct amdgpu_vram_mgr *mgr = man->priv;

 	return atomic64_read(&mgr->vis_usage);
 }

 /**
  * amdgpu_vram_mgr_debug - dump VRAM table
  *
  * @man: TTM memory type manager
  * @printer: DRM printer to use
  *
  * Dump the table content using printk.
  */
 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
 				  struct drm_printer *printer)
 {
 	struct amdgpu_vram_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, ram usage:%lluMB, vis usage:%lluMB\n",
 		   man->size, amdgpu_vram_mgr_usage(man) >> 20,
 		   amdgpu_vram_mgr_vis_usage(man) >> 20);
 }

 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
 	.init		= amdgpu_vram_mgr_init,
 	.takedown	= amdgpu_vram_mgr_fini,
 	.get_node	= amdgpu_vram_mgr_new,
 	.put_node	= amdgpu_vram_mgr_del,
 	.debug		= amdgpu_vram_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_vram_mgr {
	struct drm_mm mm;
	spinlock_t lock;
	atomic64_t usage;
	atomic64_t vis_usage;
	};

	/**
	* amdgpu_vram_mgr_init - init VRAM manager and DRM MM
	*
	* @man: TTM memory type manager
	* @p_size: maximum size of VRAM
	*
	* Allocate and initialize the VRAM manager.
	*/
	static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
	unsigned long p_size)
	{
	struct amdgpu_vram_mgr *mgr;

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

	drm_mm_init(&mgr->mm, 0, p_size);
	spin_lock_init(&mgr->lock);
	man->priv = mgr;
	return 0;
	}

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

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

	/**
	* amdgpu_vram_mgr_vis_size - Calculate visible node size
	*
	* @adev: amdgpu device structure
	* @node: MM node structure
	*
	* Calculate how many bytes of the MM node are inside visible VRAM
	*/
	static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
	struct drm_mm_node *node)
	{
	uint64_t start = node->start << PAGE_SHIFT;
	uint64_t end = (node->size + node->start) << PAGE_SHIFT;

	if (start >= adev->gmc.visible_vram_size)
	return 0;

	return (end > adev->gmc.visible_vram_size ?
	adev->gmc.visible_vram_size : end) - start;
	}

	/**
	* amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
	*
	* @bo: &amdgpu_bo buffer object (must be in VRAM)
	*
	* Returns:
	* How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
	*/
	u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
	{
	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
	struct ttm_mem_reg *mem = &bo->tbo.mem;
	struct drm_mm_node *nodes = mem->mm_node;
	unsigned pages = mem->num_pages;
	u64 usage;

	if (amdgpu_gmc_vram_full_visible(&adev->gmc))
	return amdgpu_bo_size(bo);

	if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
	return 0;

	for (usage = 0; nodes && pages; pages -= nodes->size, nodes++)
	usage += amdgpu_vram_mgr_vis_size(adev, nodes);

	return usage;
	}

	/**
	* amdgpu_vram_mgr_virt_start - update virtual start address
	*
	* @mem: ttm_mem_reg to update
	* @node: just allocated node
	*
	* Calculate a virtual BO start address to easily check if everything is CPU
	* accessible.
	*/
	static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem,
	struct drm_mm_node *node)
	{
	unsigned long start;

	start = node->start + node->size;
	if (start > mem->num_pages)
	start -= mem->num_pages;
	else
	start = 0;
	mem->start = max(mem->start, start);
	}

	/**
	* amdgpu_vram_mgr_new - 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 VRAM for the given BO.
	*/
	static int amdgpu_vram_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_device *adev = amdgpu_ttm_adev(man->bdev);
	struct amdgpu_vram_mgr *mgr = man->priv;
	struct drm_mm *mm = &mgr->mm;
	struct drm_mm_node *nodes;
	enum drm_mm_insert_mode mode;
	unsigned long lpfn, num_nodes, pages_per_node, pages_left;
	uint64_t usage = 0, vis_usage = 0;
	unsigned i;
	int r;

	lpfn = place->lpfn;
	if (!lpfn)
	lpfn = man->size;

	if (place->flags & TTM_PL_FLAG_CONTIGUOUS \|\|
	amdgpu_vram_page_split == -1) {
	pages_per_node = ~0ul;
	num_nodes = 1;
	} else {
	pages_per_node = max((uint32_t)amdgpu_vram_page_split,
	mem->page_alignment);
	num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
	}

	nodes = kvmalloc_array(num_nodes, sizeof(*nodes),
	GFP_KERNEL \| __GFP_ZERO);
	if (!nodes)
	return -ENOMEM;

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

	mem->start = 0;
	pages_left = mem->num_pages;

	spin_lock(&mgr->lock);
	for (i = 0; pages_left >= pages_per_node; ++i) {
	unsigned long pages = rounddown_pow_of_two(pages_left);

	r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
	pages_per_node, 0,
	place->fpfn, lpfn,
	mode);
	if (unlikely(r))
	break;

	usage += nodes[i].size << PAGE_SHIFT;
	vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
	amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
	pages_left -= pages;
	}

	for (; pages_left; ++i) {
	unsigned long pages = min(pages_left, pages_per_node);
	uint32_t alignment = mem->page_alignment;

	if (pages == pages_per_node)
	alignment = pages_per_node;

	r = drm_mm_insert_node_in_range(mm, &nodes[i],
	pages, alignment, 0,
	place->fpfn, lpfn,
	mode);
	if (unlikely(r))
	goto error;

	usage += nodes[i].size << PAGE_SHIFT;
	vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
	amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
	pages_left -= pages;
	}
	spin_unlock(&mgr->lock);

	atomic64_add(usage, &mgr->usage);
	atomic64_add(vis_usage, &mgr->vis_usage);

	mem->mm_node = nodes;

	return 0;

	error:
	while (i--)
	drm_mm_remove_node(&nodes[i]);
	spin_unlock(&mgr->lock);

	kvfree(nodes);
	return r == -ENOSPC ? 0 : r;
	}

	/**
	* amdgpu_vram_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 VRAM again.
	*/
	static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
	struct ttm_mem_reg *mem)
	{
	struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
	struct amdgpu_vram_mgr *mgr = man->priv;
	struct drm_mm_node *nodes = mem->mm_node;
	uint64_t usage = 0, vis_usage = 0;
	unsigned pages = mem->num_pages;

	if (!mem->mm_node)
	return;

	spin_lock(&mgr->lock);
	while (pages) {
	pages -= nodes->size;
	drm_mm_remove_node(nodes);
	usage += nodes->size << PAGE_SHIFT;
	vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
	++nodes;
	}
	spin_unlock(&mgr->lock);

	atomic64_sub(usage, &mgr->usage);
	atomic64_sub(vis_usage, &mgr->vis_usage);

	kvfree(mem->mm_node);
	mem->mm_node = NULL;
	}

	/**
	* amdgpu_vram_mgr_usage - how many bytes are used in this domain
	*
	* @man: TTM memory type manager
	*
	* Returns how many bytes are used in this domain.
	*/
	uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
	{
	struct amdgpu_vram_mgr *mgr = man->priv;

	return atomic64_read(&mgr->usage);
	}

	/**
	* amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
	*
	* @man: TTM memory type manager
	*
	* Returns how many bytes are used in the visible part of VRAM
	*/
	uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
	{
	struct amdgpu_vram_mgr *mgr = man->priv;

	return atomic64_read(&mgr->vis_usage);
	}

	/**
	* amdgpu_vram_mgr_debug - dump VRAM table
	*
	* @man: TTM memory type manager
	* @printer: DRM printer to use
	*
	* Dump the table content using printk.
	*/
	static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
	struct drm_printer *printer)
	{
	struct amdgpu_vram_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, ram usage:%lluMB, vis usage:%lluMB\n",
	man->size, amdgpu_vram_mgr_usage(man) >> 20,
	amdgpu_vram_mgr_vis_usage(man) >> 20);
	}

	const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
	.init = amdgpu_vram_mgr_init,
	.takedown = amdgpu_vram_mgr_fini,
	.get_node = amdgpu_vram_mgr_new,
	.put_node = amdgpu_vram_mgr_del,
	.debug = amdgpu_vram_mgr_debug
	};