1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2007-2010 VMware, Inc., Palo Alto, CA., USA
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	struct ttm_resource_manager manager;
41	spinlock_t lock;
42	struct ida gmr_ida;
43	uint32_t max_gmr_ids;
44	uint32_t max_gmr_pages;
45	uint32_t used_gmr_pages;
46};
47
48static struct vmwgfx_gmrid_man *to_gmrid_manager(struct ttm_resource_manager *man)
49{
50	return container_of(man, struct vmwgfx_gmrid_man, manager);
51}
52
53static int vmw_gmrid_man_get_node(struct ttm_resource_manager *man,
54				  struct ttm_buffer_object *bo,
55				  const struct ttm_place *place,
56				  struct ttm_resource *mem)
57{
58	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
59	int id;
60
61	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
62	if (id < 0)
63		return id;
64
65	spin_lock(&gman->lock);
66
67	if (gman->max_gmr_pages > 0) {
68		gman->used_gmr_pages += bo->num_pages;
69		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
70			goto nospace;
71	}
72
73	mem->mm_node = gman;
74	mem->start = id;
75	mem->num_pages = bo->num_pages;
76
77	spin_unlock(&gman->lock);
78	return 0;
79
80nospace:
81	gman->used_gmr_pages -= bo->num_pages;
82	spin_unlock(&gman->lock);
83	ida_free(&gman->gmr_ida, id);
84	return -ENOSPC;
85}
86
87static void vmw_gmrid_man_put_node(struct ttm_resource_manager *man,
88				   struct ttm_resource *mem)
89{
90	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
91
92	if (mem->mm_node) {
93		ida_free(&gman->gmr_ida, mem->start);
94		spin_lock(&gman->lock);
95		gman->used_gmr_pages -= mem->num_pages;
96		spin_unlock(&gman->lock);
97		mem->mm_node = NULL;
98	}
99}
100
101static const struct ttm_resource_manager_func vmw_gmrid_manager_func;
102
103int vmw_gmrid_man_init(struct vmw_private *dev_priv, int type)
104{
105	struct ttm_resource_manager *man;
106	struct vmwgfx_gmrid_man *gman =
107		kzalloc(sizeof(*gman), GFP_KERNEL);
108
109	if (unlikely(!gman))
110		return -ENOMEM;
111
112	man = &gman->manager;
113
114	man->func = &vmw_gmrid_manager_func;
115	/* TODO: This is most likely not correct */
116	man->use_tt = true;
117	ttm_resource_manager_init(man, 0);
118	spin_lock_init(&gman->lock);
119	gman->used_gmr_pages = 0;
120	ida_init(&gman->gmr_ida);
121
122	switch (type) {
123	case VMW_PL_GMR:
124		gman->max_gmr_ids = dev_priv->max_gmr_ids;
125		gman->max_gmr_pages = dev_priv->max_gmr_pages;
126		break;
127	case VMW_PL_MOB:
128		gman->max_gmr_ids = VMWGFX_NUM_MOB;
129		gman->max_gmr_pages = dev_priv->max_mob_pages;
130		break;
131	default:
132		BUG();
133	}
134	ttm_set_driver_manager(&dev_priv->bdev, type, &gman->manager);
135	ttm_resource_manager_set_used(man, true);
136	return 0;
137}
138
139void vmw_gmrid_man_fini(struct vmw_private *dev_priv, int type)
140{
141	struct ttm_resource_manager *man = ttm_manager_type(&dev_priv->bdev, type);
142	struct vmwgfx_gmrid_man *gman = to_gmrid_manager(man);
143
144	ttm_resource_manager_set_used(man, false);
145
146	ttm_resource_manager_force_list_clean(&dev_priv->bdev, man);
147
148	ttm_resource_manager_cleanup(man);
149
150	ttm_set_driver_manager(&dev_priv->bdev, type, NULL);
151	ida_destroy(&gman->gmr_ida);
152	kfree(gman);
153
154}
155
156static const struct ttm_resource_manager_func vmw_gmrid_manager_func = {
157	.alloc = vmw_gmrid_man_get_node,
158	.free = vmw_gmrid_man_put_node,
159};
160