1 /* 2 * Copyright 2008 Advanced Micro Devices, Inc. 3 * Copyright 2008 Red Hat Inc. 4 * Copyright 2009 Jerome Glisse. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Dave Airlie 25 * Alex Deucher 26 * Jerome Glisse 27 */ 28 #include <drm/drmP.h> 29 #include <drm/radeon_drm.h> 30 #include "radeon.h" 31 32 /* 33 * GART 34 * The GART (Graphics Aperture Remapping Table) is an aperture 35 * in the GPU's address space. System pages can be mapped into 36 * the aperture and look like contiguous pages from the GPU's 37 * perspective. A page table maps the pages in the aperture 38 * to the actual backing pages in system memory. 39 * 40 * Radeon GPUs support both an internal GART, as described above, 41 * and AGP. AGP works similarly, but the GART table is configured 42 * and maintained by the northbridge rather than the driver. 43 * Radeon hw has a separate AGP aperture that is programmed to 44 * point to the AGP aperture provided by the northbridge and the 45 * requests are passed through to the northbridge aperture. 46 * Both AGP and internal GART can be used at the same time, however 47 * that is not currently supported by the driver. 48 * 49 * This file handles the common internal GART management. 50 */ 51 52 /* 53 * Common GART table functions. 54 */ 55 /** 56 * radeon_gart_table_ram_alloc - allocate system ram for gart page table 57 * 58 * @rdev: radeon_device pointer 59 * 60 * Allocate system memory for GART page table 61 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 62 * gart table to be in system memory. 63 * Returns 0 for success, -ENOMEM for failure. 64 */ 65 int radeon_gart_table_ram_alloc(struct radeon_device *rdev) 66 { 67 void *ptr; 68 69 ptr = pci_alloc_consistent(rdev->pdev, rdev->gart.table_size, 70 &rdev->gart.table_addr); 71 if (ptr == NULL) { 72 return -ENOMEM; 73 } 74 #ifdef CONFIG_X86 75 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 || 76 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) { 77 set_memory_uc((unsigned long)ptr, 78 rdev->gart.table_size >> PAGE_SHIFT); 79 } 80 #endif 81 rdev->gart.ptr = ptr; 82 memset((void *)rdev->gart.ptr, 0, rdev->gart.table_size); 83 return 0; 84 } 85 86 /** 87 * radeon_gart_table_ram_free - free system ram for gart page table 88 * 89 * @rdev: radeon_device pointer 90 * 91 * Free system memory for GART page table 92 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 93 * gart table to be in system memory. 94 */ 95 void radeon_gart_table_ram_free(struct radeon_device *rdev) 96 { 97 if (rdev->gart.ptr == NULL) { 98 return; 99 } 100 #ifdef CONFIG_X86 101 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 || 102 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) { 103 set_memory_wb((unsigned long)rdev->gart.ptr, 104 rdev->gart.table_size >> PAGE_SHIFT); 105 } 106 #endif 107 pci_free_consistent(rdev->pdev, rdev->gart.table_size, 108 (void *)rdev->gart.ptr, 109 rdev->gart.table_addr); 110 rdev->gart.ptr = NULL; 111 rdev->gart.table_addr = 0; 112 } 113 114 /** 115 * radeon_gart_table_vram_alloc - allocate vram for gart page table 116 * 117 * @rdev: radeon_device pointer 118 * 119 * Allocate video memory for GART page table 120 * (pcie r4xx, r5xx+). These asics require the 121 * gart table to be in video memory. 122 * Returns 0 for success, error for failure. 123 */ 124 int radeon_gart_table_vram_alloc(struct radeon_device *rdev) 125 { 126 int r; 127 128 if (rdev->gart.robj == NULL) { 129 r = radeon_bo_create(rdev, rdev->gart.table_size, 130 PAGE_SIZE, true, RADEON_GEM_DOMAIN_VRAM, 131 0, NULL, &rdev->gart.robj); 132 if (r) { 133 return r; 134 } 135 } 136 return 0; 137 } 138 139 /** 140 * radeon_gart_table_vram_pin - pin gart page table in vram 141 * 142 * @rdev: radeon_device pointer 143 * 144 * Pin the GART page table in vram so it will not be moved 145 * by the memory manager (pcie r4xx, r5xx+). These asics require the 146 * gart table to be in video memory. 147 * Returns 0 for success, error for failure. 148 */ 149 int radeon_gart_table_vram_pin(struct radeon_device *rdev) 150 { 151 uint64_t gpu_addr; 152 int r; 153 154 r = radeon_bo_reserve(rdev->gart.robj, false); 155 if (unlikely(r != 0)) 156 return r; 157 r = radeon_bo_pin(rdev->gart.robj, 158 RADEON_GEM_DOMAIN_VRAM, &gpu_addr); 159 if (r) { 160 radeon_bo_unreserve(rdev->gart.robj); 161 return r; 162 } 163 r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr); 164 if (r) 165 radeon_bo_unpin(rdev->gart.robj); 166 radeon_bo_unreserve(rdev->gart.robj); 167 rdev->gart.table_addr = gpu_addr; 168 return r; 169 } 170 171 /** 172 * radeon_gart_table_vram_unpin - unpin gart page table in vram 173 * 174 * @rdev: radeon_device pointer 175 * 176 * Unpin the GART page table in vram (pcie r4xx, r5xx+). 177 * These asics require the gart table to be in video memory. 178 */ 179 void radeon_gart_table_vram_unpin(struct radeon_device *rdev) 180 { 181 int r; 182 183 if (rdev->gart.robj == NULL) { 184 return; 185 } 186 r = radeon_bo_reserve(rdev->gart.robj, false); 187 if (likely(r == 0)) { 188 radeon_bo_kunmap(rdev->gart.robj); 189 radeon_bo_unpin(rdev->gart.robj); 190 radeon_bo_unreserve(rdev->gart.robj); 191 rdev->gart.ptr = NULL; 192 } 193 } 194 195 /** 196 * radeon_gart_table_vram_free - free gart page table vram 197 * 198 * @rdev: radeon_device pointer 199 * 200 * Free the video memory used for the GART page table 201 * (pcie r4xx, r5xx+). These asics require the gart table to 202 * be in video memory. 203 */ 204 void radeon_gart_table_vram_free(struct radeon_device *rdev) 205 { 206 if (rdev->gart.robj == NULL) { 207 return; 208 } 209 radeon_bo_unref(&rdev->gart.robj); 210 } 211 212 /* 213 * Common gart functions. 214 */ 215 /** 216 * radeon_gart_unbind - unbind pages from the gart page table 217 * 218 * @rdev: radeon_device pointer 219 * @offset: offset into the GPU's gart aperture 220 * @pages: number of pages to unbind 221 * 222 * Unbinds the requested pages from the gart page table and 223 * replaces them with the dummy page (all asics). 224 */ 225 void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset, 226 int pages) 227 { 228 unsigned t; 229 unsigned p; 230 int i, j; 231 u64 page_base; 232 233 if (!rdev->gart.ready) { 234 WARN(1, "trying to unbind memory from uninitialized GART !\n"); 235 return; 236 } 237 t = offset / RADEON_GPU_PAGE_SIZE; 238 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); 239 for (i = 0; i < pages; i++, p++) { 240 if (rdev->gart.pages[p]) { 241 rdev->gart.pages[p] = NULL; 242 rdev->gart.pages_addr[p] = rdev->dummy_page.addr; 243 page_base = rdev->gart.pages_addr[p]; 244 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) { 245 if (rdev->gart.ptr) { 246 radeon_gart_set_page(rdev, t, page_base, 247 RADEON_GART_PAGE_DUMMY); 248 } 249 page_base += RADEON_GPU_PAGE_SIZE; 250 } 251 } 252 } 253 mb(); 254 radeon_gart_tlb_flush(rdev); 255 } 256 257 /** 258 * radeon_gart_bind - bind pages into the gart page table 259 * 260 * @rdev: radeon_device pointer 261 * @offset: offset into the GPU's gart aperture 262 * @pages: number of pages to bind 263 * @pagelist: pages to bind 264 * @dma_addr: DMA addresses of pages 265 * @flags: RADEON_GART_PAGE_* flags 266 * 267 * Binds the requested pages to the gart page table 268 * (all asics). 269 * Returns 0 for success, -EINVAL for failure. 270 */ 271 int radeon_gart_bind(struct radeon_device *rdev, unsigned offset, 272 int pages, struct page **pagelist, dma_addr_t *dma_addr, 273 uint32_t flags) 274 { 275 unsigned t; 276 unsigned p; 277 uint64_t page_base; 278 int i, j; 279 280 if (!rdev->gart.ready) { 281 WARN(1, "trying to bind memory to uninitialized GART !\n"); 282 return -EINVAL; 283 } 284 t = offset / RADEON_GPU_PAGE_SIZE; 285 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); 286 287 for (i = 0; i < pages; i++, p++) { 288 rdev->gart.pages_addr[p] = dma_addr[i]; 289 rdev->gart.pages[p] = pagelist[i]; 290 if (rdev->gart.ptr) { 291 page_base = rdev->gart.pages_addr[p]; 292 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) { 293 radeon_gart_set_page(rdev, t, page_base, flags); 294 page_base += RADEON_GPU_PAGE_SIZE; 295 } 296 } 297 } 298 mb(); 299 radeon_gart_tlb_flush(rdev); 300 return 0; 301 } 302 303 /** 304 * radeon_gart_init - init the driver info for managing the gart 305 * 306 * @rdev: radeon_device pointer 307 * 308 * Allocate the dummy page and init the gart driver info (all asics). 309 * Returns 0 for success, error for failure. 310 */ 311 int radeon_gart_init(struct radeon_device *rdev) 312 { 313 int r, i; 314 315 if (rdev->gart.pages) { 316 return 0; 317 } 318 /* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */ 319 if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) { 320 DRM_ERROR("Page size is smaller than GPU page size!\n"); 321 return -EINVAL; 322 } 323 r = radeon_dummy_page_init(rdev); 324 if (r) 325 return r; 326 /* Compute table size */ 327 rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE; 328 rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE; 329 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n", 330 rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages); 331 /* Allocate pages table */ 332 rdev->gart.pages = vzalloc(sizeof(void *) * rdev->gart.num_cpu_pages); 333 if (rdev->gart.pages == NULL) { 334 radeon_gart_fini(rdev); 335 return -ENOMEM; 336 } 337 rdev->gart.pages_addr = vzalloc(sizeof(dma_addr_t) * 338 rdev->gart.num_cpu_pages); 339 if (rdev->gart.pages_addr == NULL) { 340 radeon_gart_fini(rdev); 341 return -ENOMEM; 342 } 343 /* set GART entry to point to the dummy page by default */ 344 for (i = 0; i < rdev->gart.num_cpu_pages; i++) { 345 rdev->gart.pages_addr[i] = rdev->dummy_page.addr; 346 } 347 return 0; 348 } 349 350 /** 351 * radeon_gart_fini - tear down the driver info for managing the gart 352 * 353 * @rdev: radeon_device pointer 354 * 355 * Tear down the gart driver info and free the dummy page (all asics). 356 */ 357 void radeon_gart_fini(struct radeon_device *rdev) 358 { 359 if (rdev->gart.pages && rdev->gart.pages_addr && rdev->gart.ready) { 360 /* unbind pages */ 361 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages); 362 } 363 rdev->gart.ready = false; 364 vfree(rdev->gart.pages); 365 vfree(rdev->gart.pages_addr); 366 rdev->gart.pages = NULL; 367 rdev->gart.pages_addr = NULL; 368 369 radeon_dummy_page_fini(rdev); 370 } 371