[mirror_ubuntu-artful-kernel.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_vram_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/drmP.h>
#include "amdgpu.h"

struct amdgpu_vram_mgr {
	struct drm_mm mm;
	spinlock_t lock;
};

/**
 * 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);
	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_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_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;
	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 = kcalloc(num_nodes, sizeof(*nodes), GFP_KERNEL);
	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; i < num_nodes; ++i) {
		unsigned long pages = min(pages_left, pages_per_node);
		uint32_t alignment = mem->page_alignment;
		unsigned long start;

		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;

		/* Calculate a virtual BO start address to easily check if
		 * everything is CPU accessible.
		 */
		start = nodes[i].start + nodes[i].size;
		if (start > mem->num_pages)
			start -= mem->num_pages;
		else
			start = 0;
		mem->start = max(mem->start, start);
		pages_left -= pages;
	}
	spin_unlock(&mgr->lock);

	mem->mm_node = nodes;

	return 0;

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

	kfree(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_vram_mgr *mgr = man->priv;
	struct drm_mm_node *nodes = mem->mm_node;
	unsigned pages = mem->num_pages;

	if (!mem->mm_node)
		return;

	spin_lock(&mgr->lock);
	while (pages) {
		pages -= nodes->size;
		drm_mm_remove_node(nodes);
		++nodes;
	}
	spin_unlock(&mgr->lock);

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

/**
 * amdgpu_vram_mgr_debug - dump VRAM table
 *
 * @man: TTM memory type manager
 * @prefix: text prefix
 *
 * Dump the table content using printk.
 */
static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
				  const char *prefix)
{
	struct amdgpu_vram_mgr *mgr = man->priv;
	struct drm_printer p = drm_debug_printer(prefix);

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

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
};
Commit	Line	Data
6a7f76e7 CK	1	/*
	2	* Copyright 2016 Advanced Micro Devices, Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*
	22	* Authors: Christian König
	23	*/
	24
	25	#include <drm/drmP.h>
	26	#include "amdgpu.h"
	27
	28	struct amdgpu_vram_mgr {
	29	struct drm_mm mm;
	30	spinlock_t lock;
	31	};
	32
	33	/**
	34	* amdgpu_vram_mgr_init - init VRAM manager and DRM MM
	35	*
	36	* @man: TTM memory type manager
	37	* @p_size: maximum size of VRAM
	38	*
	39	* Allocate and initialize the VRAM manager.
	40	*/
	41	static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
	42	unsigned long p_size)
	43	{
	44	struct amdgpu_vram_mgr *mgr;
	45
	46	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
	47	if (!mgr)
	48	return -ENOMEM;
	49
	50	drm_mm_init(&mgr->mm, 0, p_size);
	51	spin_lock_init(&mgr->lock);
	52	man->priv = mgr;
	53	return 0;
	54	}
	55
	56	/**
	57	* amdgpu_vram_mgr_fini - free and destroy VRAM manager
	58	*
	59	* @man: TTM memory type manager
	60	*
	61	* Destroy and free the VRAM manager, returns -EBUSY if ranges are still
	62	* allocated inside it.
	63	*/
	64	static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
65	{
66	struct amdgpu_vram_mgr *mgr = man->priv;
67
68	spin_lock(&mgr->lock);
69	if (!drm_mm_clean(&mgr->mm)) {
70	spin_unlock(&mgr->lock);
71	return -EBUSY;
72	}
73
74	drm_mm_takedown(&mgr->mm);
75	spin_unlock(&mgr->lock);
76	kfree(mgr);
77	man->priv = NULL;
78	return 0;
79	}
80
81	/**
82	* amdgpu_vram_mgr_new - allocate new ranges
83	*
84	* @man: TTM memory type manager
85	* @tbo: TTM BO we need this range for
86	* @place: placement flags and restrictions
87	* @mem: the resulting mem object
88	*
89	* Allocate VRAM for the given BO.
90	*/
91	static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
92	struct ttm_buffer_object *tbo,
93	const struct ttm_place *place,
94	struct ttm_mem_reg *mem)
95	{
6a7f76e7 CK	96	struct amdgpu_vram_mgr *mgr = man->priv;
	97	struct drm_mm *mm = &mgr->mm;
	98	struct drm_mm_node *nodes;
4e64e553	99	enum drm_mm_insert_mode mode;
6a7f76e7 CK	100	unsigned long lpfn, num_nodes, pages_per_node, pages_left;
	101	unsigned i;
	102	int r;
	103
	104	lpfn = place->lpfn;
	105	if (!lpfn)
	106	lpfn = man->size;
	107
89bb5752 CK	108	if (place->flags & TTM_PL_FLAG_CONTIGUOUS \|\|
89bb5752 CK	109	amdgpu_vram_page_split == -1) {
6a7f76e7 CK	110	pages_per_node = ~0ul;
	111	num_nodes = 1;
	112	} else {
	113	pages_per_node = max((uint32_t)amdgpu_vram_page_split,
	114	mem->page_alignment);
	115	num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
	116	}
	117
	118	nodes = kcalloc(num_nodes, sizeof(*nodes), GFP_KERNEL);
	119	if (!nodes)
	120	return -ENOMEM;
	121
4e64e553 CW	122	mode = DRM_MM_INSERT_BEST;
	123	if (place->flags & TTM_PL_FLAG_TOPDOWN)
	124	mode = DRM_MM_INSERT_HIGH;
6a7f76e7	125
89bb5752	126	mem->start = 0;
6a7f76e7 CK	127	pages_left = mem->num_pages;
	128
	129	spin_lock(&mgr->lock);
	130	for (i = 0; i < num_nodes; ++i) {
	131	unsigned long pages = min(pages_left, pages_per_node);
	132	uint32_t alignment = mem->page_alignment;
89bb5752	133	unsigned long start;
6a7f76e7 CK	134
	135	if (pages == pages_per_node)
	136	alignment = pages_per_node;
6a7f76e7	137
4e64e553 CW	138	r = drm_mm_insert_node_in_range(mm, &nodes[i],
	139	pages, alignment, 0,
	140	place->fpfn, lpfn,
	141	mode);
6a7f76e7 CK	142	if (unlikely(r))
	143	goto error;
	144
89bb5752 CK	145	/* Calculate a virtual BO start address to easily check if
	146	* everything is CPU accessible.
	147	*/
	148	start = nodes[i].start + nodes[i].size;
	149	if (start > mem->num_pages)
	150	start -= mem->num_pages;
	151	else
	152	start = 0;
	153	mem->start = max(mem->start, start);
6a7f76e7 CK	154	pages_left -= pages;
	155	}
	156	spin_unlock(&mgr->lock);
	157
6a7f76e7 CK	158	mem->mm_node = nodes;
	159
	160	return 0;
	161
	162	error:
	163	while (i--)
	164	drm_mm_remove_node(&nodes[i]);
	165	spin_unlock(&mgr->lock);
	166
	167	kfree(nodes);
	168	return r == -ENOSPC ? 0 : r;
	169	}
	170
	171	/**
	172	* amdgpu_vram_mgr_del - free ranges
	173	*
	174	* @man: TTM memory type manager
	175	* @tbo: TTM BO we need this range for
	176	* @place: placement flags and restrictions
	177	* @mem: TTM memory object
	178	*
	179	* Free the allocated VRAM again.
	180	*/
	181	static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
	182	struct ttm_mem_reg *mem)
	183	{
	184	struct amdgpu_vram_mgr *mgr = man->priv;
	185	struct drm_mm_node *nodes = mem->mm_node;
	186	unsigned pages = mem->num_pages;
	187
	188	if (!mem->mm_node)
	189	return;
	190
	191	spin_lock(&mgr->lock);
	192	while (pages) {
	193	pages -= nodes->size;
	194	drm_mm_remove_node(nodes);
	195	++nodes;
	196	}
	197	spin_unlock(&mgr->lock);
	198
	199	kfree(mem->mm_node);
	200	mem->mm_node = NULL;
	201	}
	202
	203	/**
	204	* amdgpu_vram_mgr_debug - dump VRAM table
	205	*
	206	* @man: TTM memory type manager
	207	* @prefix: text prefix
	208	*
	209	* Dump the table content using printk.
	210	*/
	211	static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
	212	const char *prefix)
	213	{
	214	struct amdgpu_vram_mgr *mgr = man->priv;
b5c3714f	215	struct drm_printer p = drm_debug_printer(prefix);
6a7f76e7 CK	216
6a7f76e7 CK	217	spin_lock(&mgr->lock);
b5c3714f	218	drm_mm_print(&mgr->mm, &p);
6a7f76e7 CK	219	spin_unlock(&mgr->lock);
	220	}
	221
	222	const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
2a9d6d26 KC	223	.init = amdgpu_vram_mgr_init,
	224	.takedown = amdgpu_vram_mgr_fini,
	225	.get_node = amdgpu_vram_mgr_new,
	226	.put_node = amdgpu_vram_mgr_del,
	227	.debug = amdgpu_vram_mgr_debug
6a7f76e7	228	};