summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
blob: fb1bf4dd91d19715382f6b5f0e92b231b1bfc39a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
 *
 * 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,
				  const struct ttm_place *place,
				  struct ttm_mem_reg *mem)
{
	struct vmwgfx_gmrid_man *gman =
		(struct vmwgfx_gmrid_man *)man->priv;
	int id;

	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
	if (id < 0)
		return (id != -ENOMEM ? 0 : id);

	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 nospace;
	}

	mem->mm_node = gman;
	mem->start = id;
	mem->num_pages = bo->num_pages;

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

nospace:
	gman->used_gmr_pages -= bo->num_pages;
	spin_unlock(&gman->lock);
	ida_free(&gman->gmr_ida, id);
	return -ENOSPC;
}

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) {
		ida_free(&gman->gmr_ida, mem->start);
		spin_lock(&gman->lock);
		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))
		return -ENOMEM;

	spin_lock_init(&gman->lock);
	gman->used_gmr_pages = 0;
	ida_init(&gman->gmr_ida);

	switch (p_size) {
	case VMW_PL_GMR:
		gman->max_gmr_ids = dev_priv->max_gmr_ids;
		gman->max_gmr_pages = dev_priv->max_gmr_pages;
		break;
	case VMW_PL_MOB:
		gman->max_gmr_ids = VMWGFX_NUM_MOB;
		gman->max_gmr_pages = dev_priv->max_mob_pages;
		break;
	default:
		BUG();
	}
	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;
}

const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
	.init = vmw_gmrid_man_init,
	.takedown = vmw_gmrid_man_takedown,
	.get_node = vmw_gmrid_man_get_node,
	.put_node = vmw_gmrid_man_put_node,
};