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fb1d9738 JB |
1 | /************************************************************************** |
2 | * | |
2de59d01 | 3 | * Copyright © 2009-2011 VMware, Inc., Palo Alto, CA., USA |
fb1d9738 JB |
4 | * All Rights Reserved. |
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" | |
760285e7 DH |
29 | #include <drm/drmP.h> |
30 | #include <drm/ttm/ttm_bo_driver.h> | |
fb1d9738 | 31 | |
2de59d01 TH |
32 | #define VMW_PPN_SIZE sizeof(unsigned long) |
33 | ||
34 | static int vmw_gmr2_bind(struct vmw_private *dev_priv, | |
35 | struct page *pages[], | |
36 | unsigned long num_pages, | |
37 | int gmr_id) | |
38 | { | |
39 | SVGAFifoCmdDefineGMR2 define_cmd; | |
40 | SVGAFifoCmdRemapGMR2 remap_cmd; | |
41 | uint32_t define_size = sizeof(define_cmd) + 4; | |
42 | uint32_t remap_size = VMW_PPN_SIZE * num_pages + sizeof(remap_cmd) + 4; | |
43 | uint32_t *cmd; | |
44 | uint32_t *cmd_orig; | |
45 | uint32_t i; | |
46 | ||
47 | cmd_orig = cmd = vmw_fifo_reserve(dev_priv, define_size + remap_size); | |
48 | if (unlikely(cmd == NULL)) | |
49 | return -ENOMEM; | |
50 | ||
51 | define_cmd.gmrId = gmr_id; | |
52 | define_cmd.numPages = num_pages; | |
53 | ||
54 | remap_cmd.gmrId = gmr_id; | |
55 | remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ? | |
56 | SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32; | |
57 | remap_cmd.offsetPages = 0; | |
58 | remap_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(uint32); | |
63 | ||
64 | *cmd++ = SVGA_CMD_REMAP_GMR2; | |
65 | memcpy(cmd, &remap_cmd, sizeof(remap_cmd)); | |
66 | cmd += sizeof(remap_cmd) / sizeof(uint32); | |
67 | ||
68 | for (i = 0; i < num_pages; ++i) { | |
0824db38 | 69 | if (VMW_PPN_SIZE <= 4) |
2de59d01 TH |
70 | *cmd = page_to_pfn(*pages++); |
71 | else | |
72 | *((uint64_t *)cmd) = page_to_pfn(*pages++); | |
73 | ||
74 | cmd += VMW_PPN_SIZE / sizeof(*cmd); | |
75 | } | |
76 | ||
77 | vmw_fifo_commit(dev_priv, define_size + remap_size); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static void vmw_gmr2_unbind(struct vmw_private *dev_priv, | |
83 | int gmr_id) | |
84 | { | |
85 | SVGAFifoCmdDefineGMR2 define_cmd; | |
86 | uint32_t define_size = sizeof(define_cmd) + 4; | |
87 | uint32_t *cmd; | |
88 | ||
89 | cmd = vmw_fifo_reserve(dev_priv, define_size); | |
90 | if (unlikely(cmd == NULL)) { | |
91 | DRM_ERROR("GMR2 unbind failed.\n"); | |
92 | return; | |
93 | } | |
94 | define_cmd.gmrId = gmr_id; | |
95 | define_cmd.numPages = 0; | |
96 | ||
97 | *cmd++ = SVGA_CMD_DEFINE_GMR2; | |
98 | memcpy(cmd, &define_cmd, sizeof(define_cmd)); | |
99 | ||
100 | vmw_fifo_commit(dev_priv, define_size); | |
101 | } | |
102 | ||
fb1d9738 JB |
103 | /** |
104 | * FIXME: Adjust to the ttm lowmem / highmem storage to minimize | |
105 | * the number of used descriptors. | |
106 | */ | |
107 | ||
108 | static int vmw_gmr_build_descriptors(struct list_head *desc_pages, | |
109 | struct page *pages[], | |
110 | unsigned long num_pages) | |
111 | { | |
112 | struct page *page, *next; | |
113 | struct svga_guest_mem_descriptor *page_virtual = NULL; | |
114 | struct svga_guest_mem_descriptor *desc_virtual = NULL; | |
115 | unsigned int desc_per_page; | |
116 | unsigned long prev_pfn; | |
117 | unsigned long pfn; | |
118 | int ret; | |
119 | ||
120 | desc_per_page = PAGE_SIZE / | |
121 | sizeof(struct svga_guest_mem_descriptor) - 1; | |
122 | ||
123 | while (likely(num_pages != 0)) { | |
124 | page = alloc_page(__GFP_HIGHMEM); | |
125 | if (unlikely(page == NULL)) { | |
126 | ret = -ENOMEM; | |
127 | goto out_err; | |
128 | } | |
129 | ||
130 | list_add_tail(&page->lru, desc_pages); | |
131 | ||
132 | /* | |
133 | * Point previous page terminating descriptor to this | |
134 | * page before unmapping it. | |
135 | */ | |
136 | ||
137 | if (likely(page_virtual != NULL)) { | |
138 | desc_virtual->ppn = page_to_pfn(page); | |
1c9c20f6 | 139 | kunmap_atomic(page_virtual); |
fb1d9738 JB |
140 | } |
141 | ||
1c9c20f6 | 142 | page_virtual = kmap_atomic(page); |
fb1d9738 JB |
143 | desc_virtual = page_virtual - 1; |
144 | prev_pfn = ~(0UL); | |
145 | ||
146 | while (likely(num_pages != 0)) { | |
147 | pfn = page_to_pfn(*pages); | |
148 | ||
149 | if (pfn != prev_pfn + 1) { | |
150 | ||
151 | if (desc_virtual - page_virtual == | |
152 | desc_per_page - 1) | |
153 | break; | |
154 | ||
155 | (++desc_virtual)->ppn = cpu_to_le32(pfn); | |
156 | desc_virtual->num_pages = cpu_to_le32(1); | |
157 | } else { | |
158 | uint32_t tmp = | |
159 | le32_to_cpu(desc_virtual->num_pages); | |
160 | desc_virtual->num_pages = cpu_to_le32(tmp + 1); | |
161 | } | |
162 | prev_pfn = pfn; | |
163 | --num_pages; | |
164 | ++pages; | |
165 | } | |
166 | ||
167 | (++desc_virtual)->ppn = cpu_to_le32(0); | |
168 | desc_virtual->num_pages = cpu_to_le32(0); | |
169 | } | |
170 | ||
171 | if (likely(page_virtual != NULL)) | |
1c9c20f6 | 172 | kunmap_atomic(page_virtual); |
fb1d9738 JB |
173 | |
174 | return 0; | |
175 | out_err: | |
176 | list_for_each_entry_safe(page, next, desc_pages, lru) { | |
177 | list_del_init(&page->lru); | |
178 | __free_page(page); | |
179 | } | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static inline void vmw_gmr_free_descriptors(struct list_head *desc_pages) | |
184 | { | |
185 | struct page *page, *next; | |
186 | ||
187 | list_for_each_entry_safe(page, next, desc_pages, lru) { | |
188 | list_del_init(&page->lru); | |
189 | __free_page(page); | |
190 | } | |
191 | } | |
192 | ||
193 | static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv, | |
194 | int gmr_id, struct list_head *desc_pages) | |
195 | { | |
196 | struct page *page; | |
197 | ||
198 | if (unlikely(list_empty(desc_pages))) | |
199 | return; | |
200 | ||
201 | page = list_entry(desc_pages->next, struct page, lru); | |
202 | ||
203 | mutex_lock(&dev_priv->hw_mutex); | |
204 | ||
205 | vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id); | |
206 | wmb(); | |
207 | vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, page_to_pfn(page)); | |
208 | mb(); | |
209 | ||
210 | mutex_unlock(&dev_priv->hw_mutex); | |
211 | ||
212 | } | |
213 | ||
214 | /** | |
215 | * FIXME: Adjust to the ttm lowmem / highmem storage to minimize | |
216 | * the number of used descriptors. | |
217 | */ | |
218 | ||
219 | static unsigned long vmw_gmr_count_descriptors(struct page *pages[], | |
135cba0d | 220 | unsigned long num_pages) |
fb1d9738 JB |
221 | { |
222 | unsigned long prev_pfn = ~(0UL); | |
223 | unsigned long pfn; | |
224 | unsigned long descriptors = 0; | |
225 | ||
226 | while (num_pages--) { | |
227 | pfn = page_to_pfn(*pages++); | |
228 | if (prev_pfn + 1 != pfn) | |
229 | ++descriptors; | |
230 | prev_pfn = pfn; | |
231 | } | |
232 | ||
233 | return descriptors; | |
234 | } | |
235 | ||
236 | int vmw_gmr_bind(struct vmw_private *dev_priv, | |
135cba0d TH |
237 | struct page *pages[], |
238 | unsigned long num_pages, | |
239 | int gmr_id) | |
fb1d9738 | 240 | { |
fb1d9738 | 241 | struct list_head desc_pages; |
135cba0d | 242 | int ret; |
fb1d9738 | 243 | |
2de59d01 TH |
244 | if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) |
245 | return vmw_gmr2_bind(dev_priv, pages, num_pages, gmr_id); | |
246 | ||
135cba0d | 247 | if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR))) |
fb1d9738 JB |
248 | return -EINVAL; |
249 | ||
135cba0d TH |
250 | if (vmw_gmr_count_descriptors(pages, num_pages) > |
251 | dev_priv->max_gmr_descriptors) | |
fb1d9738 JB |
252 | return -EINVAL; |
253 | ||
254 | INIT_LIST_HEAD(&desc_pages); | |
fb1d9738 | 255 | |
135cba0d | 256 | ret = vmw_gmr_build_descriptors(&desc_pages, pages, num_pages); |
fb1d9738 | 257 | if (unlikely(ret != 0)) |
135cba0d | 258 | return ret; |
fb1d9738 | 259 | |
135cba0d | 260 | vmw_gmr_fire_descriptors(dev_priv, gmr_id, &desc_pages); |
fb1d9738 | 261 | vmw_gmr_free_descriptors(&desc_pages); |
fb1d9738 | 262 | |
135cba0d | 263 | return 0; |
fb1d9738 JB |
264 | } |
265 | ||
135cba0d | 266 | |
fb1d9738 JB |
267 | void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id) |
268 | { | |
2de59d01 TH |
269 | if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) { |
270 | vmw_gmr2_unbind(dev_priv, gmr_id); | |
271 | return; | |
272 | } | |
273 | ||
fb1d9738 JB |
274 | mutex_lock(&dev_priv->hw_mutex); |
275 | vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id); | |
276 | wmb(); | |
277 | vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0); | |
278 | mb(); | |
279 | mutex_unlock(&dev_priv->hw_mutex); | |
280 | } |