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/amdgpu_drm.h> 30 #ifdef CONFIG_X86 31 #include <asm/set_memory.h> 32 #endif 33 #include "amdgpu.h" 34 35 /* 36 * GART 37 * The GART (Graphics Aperture Remapping Table) is an aperture 38 * in the GPU's address space. System pages can be mapped into 39 * the aperture and look like contiguous pages from the GPU's 40 * perspective. A page table maps the pages in the aperture 41 * to the actual backing pages in system memory. 42 * 43 * Radeon GPUs support both an internal GART, as described above, 44 * and AGP. AGP works similarly, but the GART table is configured 45 * and maintained by the northbridge rather than the driver. 46 * Radeon hw has a separate AGP aperture that is programmed to 47 * point to the AGP aperture provided by the northbridge and the 48 * requests are passed through to the northbridge aperture. 49 * Both AGP and internal GART can be used at the same time, however 50 * that is not currently supported by the driver. 51 * 52 * This file handles the common internal GART management. 53 */ 54 55 /* 56 * Common GART table functions. 57 */ 58 /** 59 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table 60 * 61 * @adev: amdgpu_device pointer 62 * 63 * Allocate system memory for GART page table 64 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 65 * gart table to be in system memory. 66 * Returns 0 for success, -ENOMEM for failure. 67 */ 68 int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev) 69 { 70 void *ptr; 71 72 ptr = pci_alloc_consistent(adev->pdev, adev->gart.table_size, 73 &adev->gart.table_addr); 74 if (ptr == NULL) { 75 return -ENOMEM; 76 } 77 #ifdef CONFIG_X86 78 if (0) { 79 set_memory_uc((unsigned long)ptr, 80 adev->gart.table_size >> PAGE_SHIFT); 81 } 82 #endif 83 adev->gart.ptr = ptr; 84 memset((void *)adev->gart.ptr, 0, adev->gart.table_size); 85 return 0; 86 } 87 88 /** 89 * amdgpu_gart_table_ram_free - free system ram for gart page table 90 * 91 * @adev: amdgpu_device pointer 92 * 93 * Free system memory for GART page table 94 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 95 * gart table to be in system memory. 96 */ 97 void amdgpu_gart_table_ram_free(struct amdgpu_device *adev) 98 { 99 if (adev->gart.ptr == NULL) { 100 return; 101 } 102 #ifdef CONFIG_X86 103 if (0) { 104 set_memory_wb((unsigned long)adev->gart.ptr, 105 adev->gart.table_size >> PAGE_SHIFT); 106 } 107 #endif 108 pci_free_consistent(adev->pdev, adev->gart.table_size, 109 (void *)adev->gart.ptr, 110 adev->gart.table_addr); 111 adev->gart.ptr = NULL; 112 adev->gart.table_addr = 0; 113 } 114 115 /** 116 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table 117 * 118 * @adev: amdgpu_device pointer 119 * 120 * Allocate video memory for GART page table 121 * (pcie r4xx, r5xx+). These asics require the 122 * gart table to be in video memory. 123 * Returns 0 for success, error for failure. 124 */ 125 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev) 126 { 127 int r; 128 129 if (adev->gart.robj == NULL) { 130 r = amdgpu_bo_create(adev, adev->gart.table_size, 131 PAGE_SIZE, true, AMDGPU_GEM_DOMAIN_VRAM, 132 AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED | 133 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS, 134 NULL, NULL, &adev->gart.robj); 135 if (r) { 136 return r; 137 } 138 } 139 return 0; 140 } 141 142 /** 143 * amdgpu_gart_table_vram_pin - pin gart page table in vram 144 * 145 * @adev: amdgpu_device pointer 146 * 147 * Pin the GART page table in vram so it will not be moved 148 * by the memory manager (pcie r4xx, r5xx+). These asics require the 149 * gart table to be in video memory. 150 * Returns 0 for success, error for failure. 151 */ 152 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev) 153 { 154 uint64_t gpu_addr; 155 int r; 156 157 r = amdgpu_bo_reserve(adev->gart.robj, false); 158 if (unlikely(r != 0)) 159 return r; 160 r = amdgpu_bo_pin(adev->gart.robj, 161 AMDGPU_GEM_DOMAIN_VRAM, &gpu_addr); 162 if (r) { 163 amdgpu_bo_unreserve(adev->gart.robj); 164 return r; 165 } 166 r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr); 167 if (r) 168 amdgpu_bo_unpin(adev->gart.robj); 169 amdgpu_bo_unreserve(adev->gart.robj); 170 adev->gart.table_addr = gpu_addr; 171 return r; 172 } 173 174 /** 175 * amdgpu_gart_table_vram_unpin - unpin gart page table in vram 176 * 177 * @adev: amdgpu_device pointer 178 * 179 * Unpin the GART page table in vram (pcie r4xx, r5xx+). 180 * These asics require the gart table to be in video memory. 181 */ 182 void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev) 183 { 184 int r; 185 186 if (adev->gart.robj == NULL) { 187 return; 188 } 189 r = amdgpu_bo_reserve(adev->gart.robj, true); 190 if (likely(r == 0)) { 191 amdgpu_bo_kunmap(adev->gart.robj); 192 amdgpu_bo_unpin(adev->gart.robj); 193 amdgpu_bo_unreserve(adev->gart.robj); 194 adev->gart.ptr = NULL; 195 } 196 } 197 198 /** 199 * amdgpu_gart_table_vram_free - free gart page table vram 200 * 201 * @adev: amdgpu_device pointer 202 * 203 * Free the video memory used for the GART page table 204 * (pcie r4xx, r5xx+). These asics require the gart table to 205 * be in video memory. 206 */ 207 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev) 208 { 209 if (adev->gart.robj == NULL) { 210 return; 211 } 212 amdgpu_bo_unref(&adev->gart.robj); 213 } 214 215 /* 216 * Common gart functions. 217 */ 218 /** 219 * amdgpu_gart_unbind - unbind pages from the gart page table 220 * 221 * @adev: amdgpu_device pointer 222 * @offset: offset into the GPU's gart aperture 223 * @pages: number of pages to unbind 224 * 225 * Unbinds the requested pages from the gart page table and 226 * replaces them with the dummy page (all asics). 227 */ 228 void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset, 229 int pages) 230 { 231 unsigned t; 232 unsigned p; 233 int i, j; 234 u64 page_base; 235 /* Starting from VEGA10, system bit must be 0 to mean invalid. */ 236 uint64_t flags = 0; 237 238 if (!adev->gart.ready) { 239 WARN(1, "trying to unbind memory from uninitialized GART !\n"); 240 return; 241 } 242 243 t = offset / AMDGPU_GPU_PAGE_SIZE; 244 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); 245 for (i = 0; i < pages; i++, p++) { 246 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS 247 adev->gart.pages[p] = NULL; 248 #endif 249 page_base = adev->dummy_page.addr; 250 if (!adev->gart.ptr) 251 continue; 252 253 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) { 254 amdgpu_gart_set_pte_pde(adev, adev->gart.ptr, 255 t, page_base, flags); 256 page_base += AMDGPU_GPU_PAGE_SIZE; 257 } 258 } 259 mb(); 260 amdgpu_gart_flush_gpu_tlb(adev, 0); 261 } 262 263 /** 264 * amdgpu_gart_bind - bind pages into the gart page table 265 * 266 * @adev: amdgpu_device pointer 267 * @offset: offset into the GPU's gart aperture 268 * @pages: number of pages to bind 269 * @pagelist: pages to bind 270 * @dma_addr: DMA addresses of pages 271 * 272 * Binds the requested pages to the gart page table 273 * (all asics). 274 * Returns 0 for success, -EINVAL for failure. 275 */ 276 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset, 277 int pages, struct page **pagelist, dma_addr_t *dma_addr, 278 uint64_t flags) 279 { 280 unsigned t; 281 unsigned p; 282 uint64_t page_base; 283 int i, j; 284 285 if (!adev->gart.ready) { 286 WARN(1, "trying to bind memory to uninitialized GART !\n"); 287 return -EINVAL; 288 } 289 290 t = offset / AMDGPU_GPU_PAGE_SIZE; 291 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); 292 293 for (i = 0; i < pages; i++, p++) { 294 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS 295 adev->gart.pages[p] = pagelist[i]; 296 #endif 297 if (adev->gart.ptr) { 298 page_base = dma_addr[i]; 299 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) { 300 amdgpu_gart_set_pte_pde(adev, adev->gart.ptr, t, page_base, flags); 301 page_base += AMDGPU_GPU_PAGE_SIZE; 302 } 303 } 304 } 305 mb(); 306 amdgpu_gart_flush_gpu_tlb(adev, 0); 307 return 0; 308 } 309 310 /** 311 * amdgpu_gart_init - init the driver info for managing the gart 312 * 313 * @adev: amdgpu_device pointer 314 * 315 * Allocate the dummy page and init the gart driver info (all asics). 316 * Returns 0 for success, error for failure. 317 */ 318 int amdgpu_gart_init(struct amdgpu_device *adev) 319 { 320 int r; 321 322 if (adev->dummy_page.page) 323 return 0; 324 325 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */ 326 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) { 327 DRM_ERROR("Page size is smaller than GPU page size!\n"); 328 return -EINVAL; 329 } 330 r = amdgpu_dummy_page_init(adev); 331 if (r) 332 return r; 333 /* Compute table size */ 334 adev->gart.num_cpu_pages = adev->mc.gtt_size / PAGE_SIZE; 335 adev->gart.num_gpu_pages = adev->mc.gtt_size / AMDGPU_GPU_PAGE_SIZE; 336 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n", 337 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages); 338 339 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS 340 /* Allocate pages table */ 341 adev->gart.pages = vzalloc(sizeof(void *) * adev->gart.num_cpu_pages); 342 if (adev->gart.pages == NULL) { 343 amdgpu_gart_fini(adev); 344 return -ENOMEM; 345 } 346 #endif 347 348 return 0; 349 } 350 351 /** 352 * amdgpu_gart_fini - tear down the driver info for managing the gart 353 * 354 * @adev: amdgpu_device pointer 355 * 356 * Tear down the gart driver info and free the dummy page (all asics). 357 */ 358 void amdgpu_gart_fini(struct amdgpu_device *adev) 359 { 360 if (adev->gart.ready) { 361 /* unbind pages */ 362 amdgpu_gart_unbind(adev, 0, adev->gart.num_cpu_pages); 363 } 364 adev->gart.ready = false; 365 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS 366 vfree(adev->gart.pages); 367 adev->gart.pages = NULL; 368 #endif 369 amdgpu_dummy_page_fini(adev); 370 } 371