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"
32#include <drm/ttm/ttm_module.h>
33#include <drm/ttm/ttm_bo_driver.h>
34#include <drm/ttm/ttm_placement.h>
35#include <linux/idr.h>
36#include <linux/spinlock.h>
37#include <linux/kernel.h>
38
39struct vmwgfx_gmrid_man {
40	spinlock_t lock;
41	struct ida gmr_ida;
42	uint32_t max_gmr_ids;
43	uint32_t max_gmr_pages;
44	uint32_t used_gmr_pages;
45};
46
47static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
48				  struct ttm_buffer_object *bo,
49				  const struct ttm_place *place,
50				  struct ttm_mem_reg *mem)
51{
52	struct vmwgfx_gmrid_man *gman =
53		(struct vmwgfx_gmrid_man *)man->priv;
54	int ret = 0;
55	int id;
56
57	mem->mm_node = NULL;
58
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	}
66
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		}
73		spin_lock(&gman->lock);
74
75		ret = ida_get_new(&gman->gmr_ida, &id);
76		if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
77			ida_remove(&gman->gmr_ida, id);
78			ret = 0;
79			goto out_err_locked;
80		}
81	} while (ret == -EAGAIN);
82
83	if (likely(ret == 0)) {
84		mem->mm_node = gman;
85		mem->start = id;
86		mem->num_pages = bo->num_pages;
87	} else
88		goto out_err_locked;
89
90	spin_unlock(&gman->lock);
91	return 0;
92
93out_err:
94	spin_lock(&gman->lock);
95out_err_locked:
96	gman->used_gmr_pages -= bo->num_pages;
97	spin_unlock(&gman->lock);
98	return ret;
99}
100
101static 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);
110		gman->used_gmr_pages -= mem->num_pages;
111		spin_unlock(&gman->lock);
112		mem->mm_node = NULL;
113	}
114}
115
116static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
117			      unsigned long p_size)
118{
119	struct vmw_private *dev_priv =
120		container_of(man->bdev, struct vmw_private, bdev);
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);
128	gman->used_gmr_pages = 0;
129	ida_init(&gman->gmr_ida);
130
131	switch (p_size) {
132	case VMW_PL_GMR:
133		gman->max_gmr_ids = dev_priv->max_gmr_ids;
134		gman->max_gmr_pages = dev_priv->max_gmr_pages;
135		break;
136	case VMW_PL_MOB:
137		gman->max_gmr_ids = VMWGFX_NUM_MOB;
138		gman->max_gmr_pages = dev_priv->max_mob_pages;
139		break;
140	default:
141		BUG();
142	}
143	man->priv = (void *) gman;
144	return 0;
145}
146
147static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
148{
149	struct vmwgfx_gmrid_man *gman =
150		(struct vmwgfx_gmrid_man *)man->priv;
151
152	if (gman) {
153		ida_destroy(&gman->gmr_ida);
154		kfree(gman);
155	}
156	return 0;
157}
158
159static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
160				const char *prefix)
161{
162	printk(KERN_INFO "%s: No debug info available for the GMR "
163	       "id manager.\n", prefix);
164}
165
166const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
167	vmw_gmrid_man_init,
168	vmw_gmrid_man_takedown,
169	vmw_gmrid_man_get_node,
170	vmw_gmrid_man_put_node,
171	vmw_gmrid_man_debug
172};
173