1 /* $NetBSD: vmwgfx_gmr.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $ */
2
3 // SPDX-License-Identifier: GPL-2.0 OR MIT
4 /**************************************************************************
5 *
6 * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
23 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
24 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
25 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
26 * USE OR OTHER DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: vmwgfx_gmr.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $");
32
33 #include <drm/ttm/ttm_bo_driver.h>
34
35 #include "vmwgfx_drv.h"
36
37 #define VMW_PPN_SIZE (sizeof(unsigned long))
38 /* A future safe maximum remap size. */
39 #define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
40 #define DMA_ADDR_INVALID ((dma_addr_t) 0)
41 #define DMA_PAGE_INVALID 0UL
42
vmw_gmr2_bind(struct vmw_private * dev_priv,struct vmw_piter * iter,unsigned long num_pages,int gmr_id)43 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
44 struct vmw_piter *iter,
45 unsigned long num_pages,
46 int gmr_id)
47 {
48 SVGAFifoCmdDefineGMR2 define_cmd;
49 SVGAFifoCmdRemapGMR2 remap_cmd;
50 uint32_t *cmd;
51 uint32_t *cmd_orig;
52 uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
53 uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
54 uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
55 uint32_t remap_pos = 0;
56 uint32_t cmd_size = define_size + remap_size;
57 uint32_t i;
58
59 cmd_orig = cmd = VMW_FIFO_RESERVE(dev_priv, cmd_size);
60 if (unlikely(cmd == NULL))
61 return -ENOMEM;
62
63 define_cmd.gmrId = gmr_id;
64 define_cmd.numPages = num_pages;
65
66 *cmd++ = SVGA_CMD_DEFINE_GMR2;
67 memcpy(cmd, &define_cmd, sizeof(define_cmd));
68 cmd += sizeof(define_cmd) / sizeof(*cmd);
69
70 /*
71 * Need to split the command if there are too many
72 * pages that goes into the gmr.
73 */
74
75 remap_cmd.gmrId = gmr_id;
76 remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
77 SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
78
79 while (num_pages > 0) {
80 unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
81
82 remap_cmd.offsetPages = remap_pos;
83 remap_cmd.numPages = nr;
84
85 *cmd++ = SVGA_CMD_REMAP_GMR2;
86 memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
87 cmd += sizeof(remap_cmd) / sizeof(*cmd);
88
89 for (i = 0; i < nr; ++i) {
90 if (VMW_PPN_SIZE <= 4)
91 *cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
92 else
93 *((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
94 PAGE_SHIFT;
95
96 cmd += VMW_PPN_SIZE / sizeof(*cmd);
97 vmw_piter_next(iter);
98 }
99
100 num_pages -= nr;
101 remap_pos += nr;
102 }
103
104 BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
105
106 vmw_fifo_commit(dev_priv, cmd_size);
107
108 return 0;
109 }
110
vmw_gmr2_unbind(struct vmw_private * dev_priv,int gmr_id)111 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
112 int gmr_id)
113 {
114 SVGAFifoCmdDefineGMR2 define_cmd;
115 uint32_t define_size = sizeof(define_cmd) + 4;
116 uint32_t *cmd;
117
118 cmd = VMW_FIFO_RESERVE(dev_priv, define_size);
119 if (unlikely(cmd == NULL))
120 return;
121
122 define_cmd.gmrId = gmr_id;
123 define_cmd.numPages = 0;
124
125 *cmd++ = SVGA_CMD_DEFINE_GMR2;
126 memcpy(cmd, &define_cmd, sizeof(define_cmd));
127
128 vmw_fifo_commit(dev_priv, define_size);
129 }
130
131
vmw_gmr_bind(struct vmw_private * dev_priv,const struct vmw_sg_table * vsgt,unsigned long num_pages,int gmr_id)132 int vmw_gmr_bind(struct vmw_private *dev_priv,
133 const struct vmw_sg_table *vsgt,
134 unsigned long num_pages,
135 int gmr_id)
136 {
137 struct vmw_piter data_iter;
138
139 vmw_piter_start(&data_iter, vsgt, 0);
140
141 if (unlikely(!vmw_piter_next(&data_iter)))
142 return 0;
143
144 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
145 return -EINVAL;
146
147 return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);
148 }
149
150
vmw_gmr_unbind(struct vmw_private * dev_priv,int gmr_id)151 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
152 {
153 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
154 vmw_gmr2_unbind(dev_priv, gmr_id);
155 }
156