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 29 #include <linux/pci.h> 30 #include <linux/vmalloc.h> 31 32 #include <drm/radeon_drm.h> 33 #ifdef CONFIG_X86 34 #include <asm/set_memory.h> 35 #endif 36 #include "radeon.h" 37 38 /* 39 * GART 40 * The GART (Graphics Aperture Remapping Table) is an aperture 41 * in the GPU's address space. System pages can be mapped into 42 * the aperture and look like contiguous pages from the GPU's 43 * perspective. A page table maps the pages in the aperture 44 * to the actual backing pages in system memory. 45 * 46 * Radeon GPUs support both an internal GART, as described above, 47 * and AGP. AGP works similarly, but the GART table is configured 48 * and maintained by the northbridge rather than the driver. 49 * Radeon hw has a separate AGP aperture that is programmed to 50 * point to the AGP aperture provided by the northbridge and the 51 * requests are passed through to the northbridge aperture. 52 * Both AGP and internal GART can be used at the same time, however 53 * that is not currently supported by the driver. 54 * 55 * This file handles the common internal GART management. 56 */ 57 58 /* 59 * Common GART table functions. 60 */ 61 /** 62 * radeon_gart_table_ram_alloc - allocate system ram for gart page table 63 * 64 * @rdev: radeon_device pointer 65 * 66 * Allocate system memory for GART page table 67 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 68 * gart table to be in system memory. 69 * Returns 0 for success, -ENOMEM for failure. 70 */ 71 int radeon_gart_table_ram_alloc(struct radeon_device *rdev) 72 { 73 void *ptr; 74 75 ptr = dma_alloc_coherent(&rdev->pdev->dev, rdev->gart.table_size, 76 &rdev->gart.table_addr, GFP_KERNEL); 77 if (!ptr) 78 return -ENOMEM; 79 80 #ifdef CONFIG_X86 81 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 || 82 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) { 83 set_memory_uc((unsigned long)ptr, 84 rdev->gart.table_size >> PAGE_SHIFT); 85 } 86 #endif 87 rdev->gart.ptr = ptr; 88 return 0; 89 } 90 91 /** 92 * radeon_gart_table_ram_free - free system ram for gart page table 93 * 94 * @rdev: radeon_device pointer 95 * 96 * Free system memory for GART page table 97 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the 98 * gart table to be in system memory. 99 */ 100 void radeon_gart_table_ram_free(struct radeon_device *rdev) 101 { 102 if (!rdev->gart.ptr) 103 return; 104 105 #ifdef CONFIG_X86 106 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 || 107 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) { 108 set_memory_wb((unsigned long)rdev->gart.ptr, 109 rdev->gart.table_size >> PAGE_SHIFT); 110 } 111 #endif 112 dma_free_coherent(&rdev->pdev->dev, rdev->gart.table_size, 113 (void *)rdev->gart.ptr, rdev->gart.table_addr); 114 rdev->gart.ptr = NULL; 115 rdev->gart.table_addr = 0; 116 } 117 118 /** 119 * radeon_gart_table_vram_alloc - allocate vram for gart page table 120 * 121 * @rdev: radeon_device pointer 122 * 123 * Allocate video memory for GART page table 124 * (pcie r4xx, r5xx+). These asics require the 125 * gart table to be in video memory. 126 * Returns 0 for success, error for failure. 127 */ 128 int radeon_gart_table_vram_alloc(struct radeon_device *rdev) 129 { 130 int r; 131 132 if (rdev->gart.robj == NULL) { 133 r = radeon_bo_create(rdev, rdev->gart.table_size, 134 PAGE_SIZE, true, RADEON_GEM_DOMAIN_VRAM, 135 0, NULL, NULL, &rdev->gart.robj); 136 if (r) 137 return r; 138 } 139 return 0; 140 } 141 142 /** 143 * radeon_gart_table_vram_pin - pin gart page table in vram 144 * 145 * @rdev: radeon_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 radeon_gart_table_vram_pin(struct radeon_device *rdev) 153 { 154 uint64_t gpu_addr; 155 int r; 156 157 r = radeon_bo_reserve(rdev->gart.robj, false); 158 if (unlikely(r != 0)) 159 return r; 160 r = radeon_bo_pin(rdev->gart.robj, 161 RADEON_GEM_DOMAIN_VRAM, &gpu_addr); 162 if (r) { 163 radeon_bo_unreserve(rdev->gart.robj); 164 return r; 165 } 166 r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr); 167 if (r) 168 radeon_bo_unpin(rdev->gart.robj); 169 radeon_bo_unreserve(rdev->gart.robj); 170 rdev->gart.table_addr = gpu_addr; 171 172 if (!r) { 173 int i; 174 175 /* We might have dropped some GART table updates while it wasn't 176 * mapped, restore all entries 177 */ 178 for (i = 0; i < rdev->gart.num_gpu_pages; i++) 179 radeon_gart_set_page(rdev, i, rdev->gart.pages_entry[i]); 180 mb(); 181 radeon_gart_tlb_flush(rdev); 182 } 183 184 return r; 185 } 186 187 /** 188 * radeon_gart_table_vram_unpin - unpin gart page table in vram 189 * 190 * @rdev: radeon_device pointer 191 * 192 * Unpin the GART page table in vram (pcie r4xx, r5xx+). 193 * These asics require the gart table to be in video memory. 194 */ 195 void radeon_gart_table_vram_unpin(struct radeon_device *rdev) 196 { 197 int r; 198 199 if (!rdev->gart.robj) 200 return; 201 202 r = radeon_bo_reserve(rdev->gart.robj, false); 203 if (likely(r == 0)) { 204 radeon_bo_kunmap(rdev->gart.robj); 205 radeon_bo_unpin(rdev->gart.robj); 206 radeon_bo_unreserve(rdev->gart.robj); 207 rdev->gart.ptr = NULL; 208 } 209 } 210 211 /** 212 * radeon_gart_table_vram_free - free gart page table vram 213 * 214 * @rdev: radeon_device pointer 215 * 216 * Free the video memory used for the GART page table 217 * (pcie r4xx, r5xx+). These asics require the gart table to 218 * be in video memory. 219 */ 220 void radeon_gart_table_vram_free(struct radeon_device *rdev) 221 { 222 if (!rdev->gart.robj) 223 return; 224 225 radeon_bo_unref(&rdev->gart.robj); 226 } 227 228 /* 229 * Common gart functions. 230 */ 231 /** 232 * radeon_gart_unbind - unbind pages from the gart page table 233 * 234 * @rdev: radeon_device pointer 235 * @offset: offset into the GPU's gart aperture 236 * @pages: number of pages to unbind 237 * 238 * Unbinds the requested pages from the gart page table and 239 * replaces them with the dummy page (all asics). 240 */ 241 void radeon_gart_unbind(struct radeon_device *rdev, unsigned int offset, 242 int pages) 243 { 244 unsigned int t, p; 245 int i, j; 246 247 if (!rdev->gart.ready) { 248 WARN(1, "trying to unbind memory from uninitialized GART !\n"); 249 return; 250 } 251 t = offset / RADEON_GPU_PAGE_SIZE; 252 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); 253 for (i = 0; i < pages; i++, p++) { 254 if (rdev->gart.pages[p]) { 255 rdev->gart.pages[p] = NULL; 256 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) { 257 rdev->gart.pages_entry[t] = rdev->dummy_page.entry; 258 if (rdev->gart.ptr) { 259 radeon_gart_set_page(rdev, t, 260 rdev->dummy_page.entry); 261 } 262 } 263 } 264 } 265 if (rdev->gart.ptr) { 266 mb(); 267 radeon_gart_tlb_flush(rdev); 268 } 269 } 270 271 /** 272 * radeon_gart_bind - bind pages into the gart page table 273 * 274 * @rdev: radeon_device pointer 275 * @offset: offset into the GPU's gart aperture 276 * @pages: number of pages to bind 277 * @pagelist: pages to bind 278 * @dma_addr: DMA addresses of pages 279 * @flags: RADEON_GART_PAGE_* flags 280 * 281 * Binds the requested pages to the gart page table 282 * (all asics). 283 * Returns 0 for success, -EINVAL for failure. 284 */ 285 int radeon_gart_bind(struct radeon_device *rdev, unsigned int offset, 286 int pages, struct page **pagelist, dma_addr_t *dma_addr, 287 uint32_t flags) 288 { 289 unsigned int t, p; 290 uint64_t page_base, page_entry; 291 int i, j; 292 293 if (!rdev->gart.ready) { 294 WARN(1, "trying to bind memory to uninitialized GART !\n"); 295 return -EINVAL; 296 } 297 t = offset / RADEON_GPU_PAGE_SIZE; 298 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); 299 300 for (i = 0; i < pages; i++, p++) { 301 rdev->gart.pages[p] = pagelist ? pagelist[i] : 302 rdev->dummy_page.page; 303 page_base = dma_addr[i]; 304 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) { 305 page_entry = radeon_gart_get_page_entry(page_base, flags); 306 rdev->gart.pages_entry[t] = page_entry; 307 if (rdev->gart.ptr) 308 radeon_gart_set_page(rdev, t, page_entry); 309 310 page_base += RADEON_GPU_PAGE_SIZE; 311 } 312 } 313 if (rdev->gart.ptr) { 314 mb(); 315 radeon_gart_tlb_flush(rdev); 316 } 317 return 0; 318 } 319 320 /** 321 * radeon_gart_init - init the driver info for managing the gart 322 * 323 * @rdev: radeon_device pointer 324 * 325 * Allocate the dummy page and init the gart driver info (all asics). 326 * Returns 0 for success, error for failure. 327 */ 328 int radeon_gart_init(struct radeon_device *rdev) 329 { 330 int r, i; 331 332 if (rdev->gart.pages) 333 return 0; 334 335 /* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */ 336 if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) { 337 DRM_ERROR("Page size is smaller than GPU page size!\n"); 338 return -EINVAL; 339 } 340 r = radeon_dummy_page_init(rdev); 341 if (r) 342 return r; 343 /* Compute table size */ 344 rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE; 345 rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE; 346 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n", 347 rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages); 348 /* Allocate pages table */ 349 rdev->gart.pages = vzalloc(array_size(sizeof(void *), 350 rdev->gart.num_cpu_pages)); 351 if (rdev->gart.pages == NULL) { 352 radeon_gart_fini(rdev); 353 return -ENOMEM; 354 } 355 rdev->gart.pages_entry = vmalloc(array_size(sizeof(uint64_t), 356 rdev->gart.num_gpu_pages)); 357 if (rdev->gart.pages_entry == NULL) { 358 radeon_gart_fini(rdev); 359 return -ENOMEM; 360 } 361 /* set GART entry to point to the dummy page by default */ 362 for (i = 0; i < rdev->gart.num_gpu_pages; i++) 363 rdev->gart.pages_entry[i] = rdev->dummy_page.entry; 364 return 0; 365 } 366 367 /** 368 * radeon_gart_fini - tear down the driver info for managing the gart 369 * 370 * @rdev: radeon_device pointer 371 * 372 * Tear down the gart driver info and free the dummy page (all asics). 373 */ 374 void radeon_gart_fini(struct radeon_device *rdev) 375 { 376 if (rdev->gart.ready) { 377 /* unbind pages */ 378 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages); 379 } 380 rdev->gart.ready = false; 381 vfree(rdev->gart.pages); 382 vfree(rdev->gart.pages_entry); 383 rdev->gart.pages = NULL; 384 rdev->gart.pages_entry = NULL; 385 386 radeon_dummy_page_fini(rdev); 387 } 388