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)) ? 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) { 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 } 102 103 /** 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); 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 } 213 214 /** 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[], 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 } 281