1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2009-2015 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
29#include "vmwgfx_drv.h"
30
31#define VMW_PPN_SIZE (sizeof(unsigned long))
32/* A future safe maximum remap size. */
33#define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
34#define DMA_ADDR_INVALID ((dma_addr_t) 0)
35#define DMA_PAGE_INVALID 0UL
36
37static int vmw_gmr2_bind(struct vmw_private *dev_priv,
38 struct vmw_piter *iter,
39 unsigned long num_pages,
40 int gmr_id)
41{
42 SVGAFifoCmdDefineGMR2 define_cmd;
43 SVGAFifoCmdRemapGMR2 remap_cmd;
44 uint32_t *cmd;
45 uint32_t *cmd_orig;
46 uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
47 uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
48 uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
49 uint32_t remap_pos = 0;
50 uint32_t cmd_size = define_size + remap_size;
51 uint32_t i;
52
53 cmd_orig = cmd = VMW_CMD_RESERVE(dev_priv, cmd_size);
54 if (unlikely(cmd == NULL))
55 return -ENOMEM;
56
57 define_cmd.gmrId = gmr_id;
58 define_cmd.numPages = num_pages;
59
60 *cmd++ = SVGA_CMD_DEFINE_GMR2;
61 memcpy(cmd, &define_cmd, sizeof(define_cmd));
62 cmd += sizeof(define_cmd) / sizeof(*cmd);
63
64 /*
65 * Need to split the command if there are too many
66 * pages that goes into the gmr.
67 */
68
69 remap_cmd.gmrId = gmr_id;
70 remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
71 SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
72
73 while (num_pages > 0) {
74 unsigned long nr = min_t(unsigned long, num_pages, VMW_PPN_PER_REMAP);
75
76 remap_cmd.offsetPages = remap_pos;
77 remap_cmd.numPages = nr;
78
79 *cmd++ = SVGA_CMD_REMAP_GMR2;
80 memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
81 cmd += sizeof(remap_cmd) / sizeof(*cmd);
82
83 for (i = 0; i < nr; ++i) {
84 if (VMW_PPN_SIZE <= 4)
85 *cmd = vmw_piter_dma_addr(viter: iter) >> PAGE_SHIFT;
86 else
87 *((uint64_t *)cmd) = vmw_piter_dma_addr(viter: iter) >>
88 PAGE_SHIFT;
89
90 cmd += VMW_PPN_SIZE / sizeof(*cmd);
91 vmw_piter_next(viter: iter);
92 }
93
94 num_pages -= nr;
95 remap_pos += nr;
96 }
97
98 BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
99
100 vmw_cmd_commit(dev_priv, bytes: cmd_size);
101
102 return 0;
103}
104
105static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
106 int gmr_id)
107{
108 SVGAFifoCmdDefineGMR2 define_cmd;
109 uint32_t define_size = sizeof(define_cmd) + 4;
110 uint32_t *cmd;
111
112 cmd = VMW_CMD_RESERVE(dev_priv, define_size);
113 if (unlikely(cmd == NULL))
114 return;
115
116 define_cmd.gmrId = gmr_id;
117 define_cmd.numPages = 0;
118
119 *cmd++ = SVGA_CMD_DEFINE_GMR2;
120 memcpy(cmd, &define_cmd, sizeof(define_cmd));
121
122 vmw_cmd_commit(dev_priv, bytes: define_size);
123}
124
125
126int vmw_gmr_bind(struct vmw_private *dev_priv,
127 const struct vmw_sg_table *vsgt,
128 unsigned long num_pages,
129 int gmr_id)
130{
131 struct vmw_piter data_iter;
132
133 vmw_piter_start(viter: &data_iter, vsgt, p_offs: 0);
134
135 if (unlikely(!vmw_piter_next(&data_iter)))
136 return 0;
137
138 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
139 return -EINVAL;
140
141 return vmw_gmr2_bind(dev_priv, iter: &data_iter, num_pages, gmr_id);
142}
143
144
145void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
146{
147 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
148 vmw_gmr2_unbind(dev_priv, gmr_id);
149}
150

source code of linux/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c