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 #include "vmwgfx_drv.h"
29 #include <drm/drmP.h>
30 #include <drm/ttm/ttm_bo_driver.h>
31 
32 #define VMW_PPN_SIZE (sizeof(unsigned long))
33 /* A future safe maximum remap size. */
34 #define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
35 #define DMA_ADDR_INVALID ((dma_addr_t) 0)
36 #define DMA_PAGE_INVALID 0UL
37 
38 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
39 			 struct vmw_piter *iter,
40 			 unsigned long num_pages,
41 			 int gmr_id)
42 {
43 	SVGAFifoCmdDefineGMR2 define_cmd;
44 	SVGAFifoCmdRemapGMR2 remap_cmd;
45 	uint32_t *cmd;
46 	uint32_t *cmd_orig;
47 	uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
48 	uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
49 	uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
50 	uint32_t remap_pos = 0;
51 	uint32_t cmd_size = define_size + remap_size;
52 	uint32_t i;
53 
54 	cmd_orig = cmd = vmw_fifo_reserve(dev_priv, cmd_size);
55 	if (unlikely(cmd == NULL))
56 		return -ENOMEM;
57 
58 	define_cmd.gmrId = gmr_id;
59 	define_cmd.numPages = num_pages;
60 
61 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
62 	memcpy(cmd, &define_cmd, sizeof(define_cmd));
63 	cmd += sizeof(define_cmd) / sizeof(*cmd);
64 
65 	/*
66 	 * Need to split the command if there are too many
67 	 * pages that goes into the gmr.
68 	 */
69 
70 	remap_cmd.gmrId = gmr_id;
71 	remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
72 		SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
73 
74 	while (num_pages > 0) {
75 		unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
76 
77 		remap_cmd.offsetPages = remap_pos;
78 		remap_cmd.numPages = nr;
79 
80 		*cmd++ = SVGA_CMD_REMAP_GMR2;
81 		memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
82 		cmd += sizeof(remap_cmd) / sizeof(*cmd);
83 
84 		for (i = 0; i < nr; ++i) {
85 			if (VMW_PPN_SIZE <= 4)
86 				*cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
87 			else
88 				*((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
89 					PAGE_SHIFT;
90 
91 			cmd += VMW_PPN_SIZE / sizeof(*cmd);
92 			vmw_piter_next(iter);
93 		}
94 
95 		num_pages -= nr;
96 		remap_pos += nr;
97 	}
98 
99 	BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
100 
101 	vmw_fifo_commit(dev_priv, cmd_size);
102 
103 	return 0;
104 }
105 
106 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
107 			    int gmr_id)
108 {
109 	SVGAFifoCmdDefineGMR2 define_cmd;
110 	uint32_t define_size = sizeof(define_cmd) + 4;
111 	uint32_t *cmd;
112 
113 	cmd = vmw_fifo_reserve(dev_priv, define_size);
114 	if (unlikely(cmd == NULL)) {
115 		DRM_ERROR("GMR2 unbind failed.\n");
116 		return;
117 	}
118 	define_cmd.gmrId = gmr_id;
119 	define_cmd.numPages = 0;
120 
121 	*cmd++ = SVGA_CMD_DEFINE_GMR2;
122 	memcpy(cmd, &define_cmd, sizeof(define_cmd));
123 
124 	vmw_fifo_commit(dev_priv, define_size);
125 }
126 
127 
128 int vmw_gmr_bind(struct vmw_private *dev_priv,
129 		 const struct vmw_sg_table *vsgt,
130 		 unsigned long num_pages,
131 		 int gmr_id)
132 {
133 	struct vmw_piter data_iter;
134 
135 	vmw_piter_start(&data_iter, vsgt, 0);
136 
137 	if (unlikely(!vmw_piter_next(&data_iter)))
138 		return 0;
139 
140 	if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
141 		return -EINVAL;
142 
143 	return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);
144 }
145 
146 
147 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
148 {
149 	if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
150 		vmw_gmr2_unbind(dev_priv, gmr_id);
151 }
152