1 /**************************************************************************
2 *
3 * Copyright © 2009-2011 VMware, Inc., Palo Alto, CA., USA
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"
29 #include "drmP.h"
30 #include "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
vmw_gmr2_bind(struct vmw_private * dev_priv,struct page * pages[],unsigned long num_pages,int gmr_id)36 static int vmw_gmr2_bind(struct vmw_private *dev_priv,
37 struct page *pages[],
38 unsigned long num_pages,
39 int gmr_id)
40 {
41 SVGAFifoCmdDefineGMR2 define_cmd;
42 SVGAFifoCmdRemapGMR2 remap_cmd;
43 uint32_t *cmd;
44 uint32_t *cmd_orig;
45 uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
46 uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
47 uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
48 uint32_t remap_pos = 0;
49 uint32_t cmd_size = define_size + remap_size;
50 uint32_t i;
51
52 cmd_orig = cmd = vmw_fifo_reserve(dev_priv, cmd_size);
53 if (unlikely(cmd == NULL))
54 return -ENOMEM;
55
56 define_cmd.gmrId = gmr_id;
57 define_cmd.numPages = num_pages;
58
59 *cmd++ = SVGA_CMD_DEFINE_GMR2;
60 memcpy(cmd, &define_cmd, sizeof(define_cmd));
61 cmd += sizeof(define_cmd) / sizeof(*cmd);
62
63 /*
64 * Need to split the command if there are too many
65 * pages that goes into the gmr.
66 */
67
68 remap_cmd.gmrId = gmr_id;
69 remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
70 SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
71
72 while (num_pages > 0) {
73 unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
74
75 remap_cmd.offsetPages = remap_pos;
76 remap_cmd.numPages = nr;
77
78 *cmd++ = SVGA_CMD_REMAP_GMR2;
79 memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
80 cmd += sizeof(remap_cmd) / sizeof(*cmd);
81
82 for (i = 0; i < nr; ++i) {
83 if (VMW_PPN_SIZE <= 4)
84 *cmd = page_to_pfn(*pages++);
85 else
86 *((uint64_t *)cmd) = page_to_pfn(*pages++);
87
88 cmd += VMW_PPN_SIZE / sizeof(*cmd);
89 }
90
91 num_pages -= nr;
92 remap_pos += nr;
93 }
94
95 BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
96
97 vmw_fifo_commit(dev_priv, cmd_size);
98
99 return 0;
100 }
101
vmw_gmr2_unbind(struct vmw_private * dev_priv,int gmr_id)102 static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
103 int gmr_id)
104 {
105 SVGAFifoCmdDefineGMR2 define_cmd;
106 uint32_t define_size = sizeof(define_cmd) + 4;
107 uint32_t *cmd;
108
109 cmd = vmw_fifo_reserve(dev_priv, define_size);
110 if (unlikely(cmd == NULL)) {
111 DRM_ERROR("GMR2 unbind failed.\n");
112 return;
113 }
114 define_cmd.gmrId = gmr_id;
115 define_cmd.numPages = 0;
116
117 *cmd++ = SVGA_CMD_DEFINE_GMR2;
118 memcpy(cmd, &define_cmd, sizeof(define_cmd));
119
120 vmw_fifo_commit(dev_priv, define_size);
121 }
122
123 /**
124 * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
125 * the number of used descriptors.
126 */
127
vmw_gmr_build_descriptors(struct list_head * desc_pages,struct page * pages[],unsigned long num_pages)128 static int vmw_gmr_build_descriptors(struct list_head *desc_pages,
129 struct page *pages[],
130 unsigned long num_pages)
131 {
132 struct page *page, *next;
133 struct svga_guest_mem_descriptor *page_virtual = NULL;
134 struct svga_guest_mem_descriptor *desc_virtual = NULL;
135 unsigned int desc_per_page;
136 unsigned long prev_pfn;
137 unsigned long pfn;
138 int ret;
139
140 desc_per_page = PAGE_SIZE /
141 sizeof(struct svga_guest_mem_descriptor) - 1;
142
143 while (likely(num_pages != 0)) {
144 page = alloc_page(__GFP_HIGHMEM);
145 if (unlikely(page == NULL)) {
146 ret = -ENOMEM;
147 goto out_err;
148 }
149
150 list_add_tail(&page->lru, desc_pages);
151
152 /*
153 * Point previous page terminating descriptor to this
154 * page before unmapping it.
155 */
156
157 if (likely(page_virtual != NULL)) {
158 desc_virtual->ppn = page_to_pfn(page);
159 kunmap_atomic(page_virtual);
160 }
161
162 page_virtual = kmap_atomic(page);
163 desc_virtual = page_virtual - 1;
164 prev_pfn = ~(0UL);
165
166 while (likely(num_pages != 0)) {
167 pfn = page_to_pfn(*pages);
168
169 if (pfn != prev_pfn + 1) {
170
171 if (desc_virtual - page_virtual ==
172 desc_per_page - 1)
173 break;
174
175 (++desc_virtual)->ppn = cpu_to_le32(pfn);
176 desc_virtual->num_pages = cpu_to_le32(1);
177 } else {
178 uint32_t tmp =
179 le32_to_cpu(desc_virtual->num_pages);
180 desc_virtual->num_pages = cpu_to_le32(tmp + 1);
181 }
182 prev_pfn = pfn;
183 --num_pages;
184 ++pages;
185 }
186
187 (++desc_virtual)->ppn = cpu_to_le32(0);
188 desc_virtual->num_pages = cpu_to_le32(0);
189 }
190
191 if (likely(page_virtual != NULL))
192 kunmap_atomic(page_virtual);
193
194 return 0;
195 out_err:
196 list_for_each_entry_safe(page, next, desc_pages, lru) {
197 list_del_init(&page->lru);
198 __free_page(page);
199 }
200 return ret;
201 }
202
vmw_gmr_free_descriptors(struct list_head * desc_pages)203 static inline void vmw_gmr_free_descriptors(struct list_head *desc_pages)
204 {
205 struct page *page, *next;
206
207 list_for_each_entry_safe(page, next, desc_pages, lru) {
208 list_del_init(&page->lru);
209 __free_page(page);
210 }
211 }
212
vmw_gmr_fire_descriptors(struct vmw_private * dev_priv,int gmr_id,struct list_head * desc_pages)213 static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv,
214 int gmr_id, struct list_head *desc_pages)
215 {
216 struct page *page;
217
218 if (unlikely(list_empty(desc_pages)))
219 return;
220
221 page = list_entry(desc_pages->next, struct page, lru);
222
223 mutex_lock(&dev_priv->hw_mutex);
224
225 vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
226 wmb();
227 vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, page_to_pfn(page));
228 mb();
229
230 mutex_unlock(&dev_priv->hw_mutex);
231
232 }
233
234 /**
235 * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
236 * the number of used descriptors.
237 */
238
vmw_gmr_count_descriptors(struct page * pages[],unsigned long num_pages)239 static unsigned long vmw_gmr_count_descriptors(struct page *pages[],
240 unsigned long num_pages)
241 {
242 unsigned long prev_pfn = ~(0UL);
243 unsigned long pfn;
244 unsigned long descriptors = 0;
245
246 while (num_pages--) {
247 pfn = page_to_pfn(*pages++);
248 if (prev_pfn + 1 != pfn)
249 ++descriptors;
250 prev_pfn = pfn;
251 }
252
253 return descriptors;
254 }
255
vmw_gmr_bind(struct vmw_private * dev_priv,struct page * pages[],unsigned long num_pages,int gmr_id)256 int vmw_gmr_bind(struct vmw_private *dev_priv,
257 struct page *pages[],
258 unsigned long num_pages,
259 int gmr_id)
260 {
261 struct list_head desc_pages;
262 int ret;
263
264 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
265 return vmw_gmr2_bind(dev_priv, pages, num_pages, gmr_id);
266
267 if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
268 return -EINVAL;
269
270 if (vmw_gmr_count_descriptors(pages, num_pages) >
271 dev_priv->max_gmr_descriptors)
272 return -EINVAL;
273
274 INIT_LIST_HEAD(&desc_pages);
275
276 ret = vmw_gmr_build_descriptors(&desc_pages, pages, num_pages);
277 if (unlikely(ret != 0))
278 return ret;
279
280 vmw_gmr_fire_descriptors(dev_priv, gmr_id, &desc_pages);
281 vmw_gmr_free_descriptors(&desc_pages);
282
283 return 0;
284 }
285
286
vmw_gmr_unbind(struct vmw_private * dev_priv,int gmr_id)287 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
288 {
289 if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) {
290 vmw_gmr2_unbind(dev_priv, gmr_id);
291 return;
292 }
293
294 mutex_lock(&dev_priv->hw_mutex);
295 vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
296 wmb();
297 vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0);
298 mb();
299 mutex_unlock(&dev_priv->hw_mutex);
300 }
301