Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vmwgfx_gmr.c
Go to the documentation of this file.
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 <drm/drmP.h>
30 #include <drm/ttm/ttm_bo_driver.h>
31 
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)) ?
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) {
69  if (VMW_PPN_SIZE <= 4)
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 
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);
139  kunmap_atomic(page_virtual);
140  }
141 
142  page_virtual = kmap_atomic(page);
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))
172  kunmap_atomic(page_virtual);
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 
219 static unsigned long vmw_gmr_count_descriptors(struct page *pages[],
220  unsigned long num_pages)
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,
237  struct page *pages[],
238  unsigned long num_pages,
239  int gmr_id)
240 {
241  struct list_head desc_pages;
242  int ret;
243 
244  if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
245  return vmw_gmr2_bind(dev_priv, pages, num_pages, gmr_id);
246 
247  if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
248  return -EINVAL;
249 
250  if (vmw_gmr_count_descriptors(pages, num_pages) >
251  dev_priv->max_gmr_descriptors)
252  return -EINVAL;
253 
254  INIT_LIST_HEAD(&desc_pages);
255 
256  ret = vmw_gmr_build_descriptors(&desc_pages, pages, num_pages);
257  if (unlikely(ret != 0))
258  return ret;
259 
260  vmw_gmr_fire_descriptors(dev_priv, gmr_id, &desc_pages);
261  vmw_gmr_free_descriptors(&desc_pages);
262 
263  return 0;
264 }
265 
266 
267 void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
268 {
269  if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) {
270  vmw_gmr2_unbind(dev_priv, gmr_id);
271  return;
272  }
273 
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 }