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 | |
37 | static 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 | |
105 | static 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 | |
126 | int 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 | |
145 | void 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 | |