[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / vmwgfx / vmwgfx_gmrid_manager.c

/**************************************************************************
 *
 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 */

#include "vmwgfx_drv.h"
#include <drm/ttm/ttm_module.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <linux/idr.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>

struct vmwgfx_gmrid_man {
	spinlock_t lock;
	struct ida gmr_ida;
	uint32_t max_gmr_ids;
	uint32_t max_gmr_pages;
	uint32_t used_gmr_pages;
};

static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
				  struct ttm_buffer_object *bo,
				  struct ttm_placement *placement,
				  struct ttm_mem_reg *mem)
{
	struct vmwgfx_gmrid_man *gman =
		(struct vmwgfx_gmrid_man *)man->priv;
	int ret = 0;
	int id;

	mem->mm_node = NULL;

	spin_lock(&gman->lock);

	if (gman->max_gmr_pages > 0) {
		gman->used_gmr_pages += bo->num_pages;
		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
			goto out_err_locked;
	}

	do {
		spin_unlock(&gman->lock);
		if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
			ret = -ENOMEM;
			goto out_err;
		}
		spin_lock(&gman->lock);

		ret = ida_get_new(&gman->gmr_ida, &id);
		if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
			ida_remove(&gman->gmr_ida, id);
			ret = 0;
			goto out_err_locked;
		}
	} while (ret == -EAGAIN);

	if (likely(ret == 0)) {
		mem->mm_node = gman;
		mem->start = id;
		mem->num_pages = bo->num_pages;
	} else
		goto out_err_locked;

	spin_unlock(&gman->lock);
	return 0;

out_err:
	spin_lock(&gman->lock);
out_err_locked:
	gman->used_gmr_pages -= bo->num_pages;
	spin_unlock(&gman->lock);
	return ret;
}

static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
				   struct ttm_mem_reg *mem)
{
	struct vmwgfx_gmrid_man *gman =
		(struct vmwgfx_gmrid_man *)man->priv;

	if (mem->mm_node) {
		spin_lock(&gman->lock);
		ida_remove(&gman->gmr_ida, mem->start);
		gman->used_gmr_pages -= mem->num_pages;
		spin_unlock(&gman->lock);
		mem->mm_node = NULL;
	}
}

static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
			      unsigned long p_size)
{
	struct vmw_private *dev_priv =
		container_of(man->bdev, struct vmw_private, bdev);
	struct vmwgfx_gmrid_man *gman =
		kzalloc(sizeof(*gman), GFP_KERNEL);

	if (unlikely(gman == NULL))
		return -ENOMEM;

	spin_lock_init(&gman->lock);
	gman->max_gmr_pages = dev_priv->max_gmr_pages;
	gman->used_gmr_pages = 0;
	ida_init(&gman->gmr_ida);
	gman->max_gmr_ids = p_size;
	man->priv = (void *) gman;
	return 0;
}

static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
{
	struct vmwgfx_gmrid_man *gman =
		(struct vmwgfx_gmrid_man *)man->priv;

	if (gman) {
		ida_destroy(&gman->gmr_ida);
		kfree(gman);
	}
	return 0;
}

static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
				const char *prefix)
{
	printk(KERN_INFO "%s: No debug info available for the GMR "
	       "id manager.\n", prefix);
}

const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
	vmw_gmrid_man_init,
	vmw_gmrid_man_takedown,
	vmw_gmrid_man_get_node,
	vmw_gmrid_man_put_node,
	vmw_gmrid_man_debug
};
Commit	Line	Data
135cba0d TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	29	*/
	30
	31	#include "vmwgfx_drv.h"
760285e7 DH	32	#include <drm/ttm/ttm_module.h>
	33	#include <drm/ttm/ttm_bo_driver.h>
	34	#include <drm/ttm/ttm_placement.h>
135cba0d TH	35	#include <linux/idr.h>
	36	#include <linux/spinlock.h>
	37	#include <linux/kernel.h>
	38
	39	struct vmwgfx_gmrid_man {
	40	spinlock_t lock;
	41	struct ida gmr_ida;
	42	uint32_t max_gmr_ids;
fb17f189 TH	43	uint32_t max_gmr_pages;
fb17f189 TH	44	uint32_t used_gmr_pages;
135cba0d TH	45	};
	46
	47	static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
	48	struct ttm_buffer_object *bo,
	49	struct ttm_placement *placement,
	50	struct ttm_mem_reg *mem)
	51	{
	52	struct vmwgfx_gmrid_man *gman =
	53	(struct vmwgfx_gmrid_man *)man->priv;
fb17f189	54	int ret = 0;
135cba0d TH	55	int id;
	56
	57	mem->mm_node = NULL;
	58
fb17f189 TH	59	spin_lock(&gman->lock);
	60
	61	if (gman->max_gmr_pages > 0) {
	62	gman->used_gmr_pages += bo->num_pages;
	63	if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
	64	goto out_err_locked;
	65	}
135cba0d	66
fb17f189 TH	67	do {
	68	spin_unlock(&gman->lock);
	69	if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
	70	ret = -ENOMEM;
	71	goto out_err;
	72	}
135cba0d	73	spin_lock(&gman->lock);
135cba0d	74
fb17f189	75	ret = ida_get_new(&gman->gmr_ida, &id);
135cba0d TH	76	if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
135cba0d TH	77	ida_remove(&gman->gmr_ida, id);
fb17f189 TH	78	ret = 0;
fb17f189 TH	79	goto out_err_locked;
135cba0d	80	}
135cba0d TH	81	} while (ret == -EAGAIN);
	82
	83	if (likely(ret == 0)) {
	84	mem->mm_node = gman;
	85	mem->start = id;
fb17f189 TH	86	mem->num_pages = bo->num_pages;
	87	} else
	88	goto out_err_locked;
	89
	90	spin_unlock(&gman->lock);
	91	return 0;
135cba0d	92
fb17f189 TH	93	out_err:
	94	spin_lock(&gman->lock);
	95	out_err_locked:
	96	gman->used_gmr_pages -= bo->num_pages;
	97	spin_unlock(&gman->lock);
135cba0d TH	98	return ret;
	99	}
	100
	101	static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
	102	struct ttm_mem_reg *mem)
	103	{
	104	struct vmwgfx_gmrid_man *gman =
	105	(struct vmwgfx_gmrid_man *)man->priv;
	106
	107	if (mem->mm_node) {
	108	spin_lock(&gman->lock);
	109	ida_remove(&gman->gmr_ida, mem->start);
fb17f189	110	gman->used_gmr_pages -= mem->num_pages;
135cba0d TH	111	spin_unlock(&gman->lock);
	112	mem->mm_node = NULL;
	113	}
	114	}
	115
	116	static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
	117	unsigned long p_size)
	118	{
fb17f189 TH	119	struct vmw_private *dev_priv =
fb17f189 TH	120	container_of(man->bdev, struct vmw_private, bdev);
135cba0d TH	121	struct vmwgfx_gmrid_man *gman =
	122	kzalloc(sizeof(*gman), GFP_KERNEL);
	123
	124	if (unlikely(gman == NULL))
	125	return -ENOMEM;
	126
	127	spin_lock_init(&gman->lock);
fb17f189 TH	128	gman->max_gmr_pages = dev_priv->max_gmr_pages;
fb17f189 TH	129	gman->used_gmr_pages = 0;
135cba0d TH	130	ida_init(&gman->gmr_ida);
	131	gman->max_gmr_ids = p_size;
	132	man->priv = (void *) gman;
	133	return 0;
	134	}
	135
	136	static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
	137	{
	138	struct vmwgfx_gmrid_man *gman =
	139	(struct vmwgfx_gmrid_man *)man->priv;
	140
	141	if (gman) {
	142	ida_destroy(&gman->gmr_ida);
	143	kfree(gman);
	144	}
	145	return 0;
	146	}
	147
	148	static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
	149	const char *prefix)
	150	{
	151	printk(KERN_INFO "%s: No debug info available for the GMR "
	152	"id manager.\n", prefix);
	153	}
	154
	155	const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
	156	vmw_gmrid_man_init,
	157	vmw_gmrid_man_takedown,
	158	vmw_gmrid_man_get_node,
	159	vmw_gmrid_man_put_node,
	160	vmw_gmrid_man_debug
	161	};