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/amdgpu_drm.h> 33 #ifdef CONFIG_X86 34 #include <asm/set_memory.h> 35 #endif 36 #include "amdgpu.h" 37 #include <drm/drm_drv.h> 38 39 /* 40 * GART 41 * The GART (Graphics Aperture Remapping Table) is an aperture 42 * in the GPU's address space. System pages can be mapped into 43 * the aperture and look like contiguous pages from the GPU's 44 * perspective. A page table maps the pages in the aperture 45 * to the actual backing pages in system memory. 46 * 47 * Radeon GPUs support both an internal GART, as described above, 48 * and AGP. AGP works similarly, but the GART table is configured 49 * and maintained by the northbridge rather than the driver. 50 * Radeon hw has a separate AGP aperture that is programmed to 51 * point to the AGP aperture provided by the northbridge and the 52 * requests are passed through to the northbridge aperture. 53 * Both AGP and internal GART can be used at the same time, however 54 * that is not currently supported by the driver. 55 * 56 * This file handles the common internal GART management. 57 */ 58 59 /* 60 * Common GART table functions. 61 */ 62 63 /** 64 * amdgpu_gart_dummy_page_init - init dummy page used by the driver 65 * 66 * @adev: amdgpu_device pointer 67 * 68 * Allocate the dummy page used by the driver (all asics). 69 * This dummy page is used by the driver as a filler for gart entries 70 * when pages are taken out of the GART 71 * Returns 0 on sucess, -ENOMEM on failure. 72 */ 73 static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev) 74 { 75 struct page *dummy_page = ttm_glob.dummy_read_page; 76 77 if (adev->dummy_page_addr) 78 return 0; 79 adev->dummy_page_addr = dma_map_page(&adev->pdev->dev, dummy_page, 0, 80 PAGE_SIZE, DMA_BIDIRECTIONAL); 81 if (dma_mapping_error(&adev->pdev->dev, adev->dummy_page_addr)) { 82 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n"); 83 adev->dummy_page_addr = 0; 84 return -ENOMEM; 85 } 86 return 0; 87 } 88 89 /** 90 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver 91 * 92 * @adev: amdgpu_device pointer 93 * 94 * Frees the dummy page used by the driver (all asics). 95 */ 96 void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev) 97 { 98 if (!adev->dummy_page_addr) 99 return; 100 dma_unmap_page(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE, 101 DMA_BIDIRECTIONAL); 102 adev->dummy_page_addr = 0; 103 } 104 105 /** 106 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table 107 * 108 * @adev: amdgpu_device pointer 109 * 110 * Allocate video memory for GART page table 111 * (pcie r4xx, r5xx+). These asics require the 112 * gart table to be in video memory. 113 * Returns 0 for success, error for failure. 114 */ 115 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev) 116 { 117 if (adev->gart.bo != NULL) 118 return 0; 119 120 return amdgpu_bo_create_kernel(adev, adev->gart.table_size, PAGE_SIZE, 121 AMDGPU_GEM_DOMAIN_VRAM, &adev->gart.bo, 122 NULL, (void *)&adev->gart.ptr); 123 } 124 125 /** 126 * amdgpu_gart_table_vram_free - free gart page table vram 127 * 128 * @adev: amdgpu_device pointer 129 * 130 * Free the video memory used for the GART page table 131 * (pcie r4xx, r5xx+). These asics require the gart table to 132 * be in video memory. 133 */ 134 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev) 135 { 136 amdgpu_bo_free_kernel(&adev->gart.bo, NULL, (void *)&adev->gart.ptr); 137 } 138 139 /* 140 * Common gart functions. 141 */ 142 /** 143 * amdgpu_gart_unbind - unbind pages from the gart page table 144 * 145 * @adev: amdgpu_device pointer 146 * @offset: offset into the GPU's gart aperture 147 * @pages: number of pages to unbind 148 * 149 * Unbinds the requested pages from the gart page table and 150 * replaces them with the dummy page (all asics). 151 * Returns 0 for success, -EINVAL for failure. 152 */ 153 void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset, 154 int pages) 155 { 156 unsigned t; 157 unsigned p; 158 int i, j; 159 u64 page_base; 160 /* Starting from VEGA10, system bit must be 0 to mean invalid. */ 161 uint64_t flags = 0; 162 int idx; 163 164 if (!adev->gart.ptr) 165 return; 166 167 if (!drm_dev_enter(adev_to_drm(adev), &idx)) 168 return; 169 170 t = offset / AMDGPU_GPU_PAGE_SIZE; 171 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE; 172 for (i = 0; i < pages; i++, p++) { 173 page_base = adev->dummy_page_addr; 174 if (!adev->gart.ptr) 175 continue; 176 177 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) { 178 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr, 179 t, page_base, flags); 180 page_base += AMDGPU_GPU_PAGE_SIZE; 181 } 182 } 183 mb(); 184 amdgpu_device_flush_hdp(adev, NULL); 185 for (i = 0; i < adev->num_vmhubs; i++) 186 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0); 187 188 drm_dev_exit(idx); 189 } 190 191 /** 192 * amdgpu_gart_map - map dma_addresses into GART entries 193 * 194 * @adev: amdgpu_device pointer 195 * @offset: offset into the GPU's gart aperture 196 * @pages: number of pages to bind 197 * @dma_addr: DMA addresses of pages 198 * @flags: page table entry flags 199 * @dst: CPU address of the gart table 200 * 201 * Map the dma_addresses into GART entries (all asics). 202 * Returns 0 for success, -EINVAL for failure. 203 */ 204 void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset, 205 int pages, dma_addr_t *dma_addr, uint64_t flags, 206 void *dst) 207 { 208 uint64_t page_base; 209 unsigned i, j, t; 210 int idx; 211 212 if (!drm_dev_enter(adev_to_drm(adev), &idx)) 213 return; 214 215 t = offset / AMDGPU_GPU_PAGE_SIZE; 216 217 for (i = 0; i < pages; i++) { 218 page_base = dma_addr[i]; 219 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) { 220 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags); 221 page_base += AMDGPU_GPU_PAGE_SIZE; 222 } 223 } 224 drm_dev_exit(idx); 225 } 226 227 /** 228 * amdgpu_gart_bind - bind pages into the gart page table 229 * 230 * @adev: amdgpu_device pointer 231 * @offset: offset into the GPU's gart aperture 232 * @pages: number of pages to bind 233 * @dma_addr: DMA addresses of pages 234 * @flags: page table entry flags 235 * 236 * Binds the requested pages to the gart page table 237 * (all asics). 238 * Returns 0 for success, -EINVAL for failure. 239 */ 240 void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset, 241 int pages, dma_addr_t *dma_addr, 242 uint64_t flags) 243 { 244 if (!adev->gart.ptr) 245 return; 246 247 amdgpu_gart_map(adev, offset, pages, dma_addr, flags, adev->gart.ptr); 248 } 249 250 /** 251 * amdgpu_gart_invalidate_tlb - invalidate gart TLB 252 * 253 * @adev: amdgpu device driver pointer 254 * 255 * Invalidate gart TLB which can be use as a way to flush gart changes 256 * 257 */ 258 void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev) 259 { 260 int i; 261 262 if (!adev->gart.ptr) 263 return; 264 265 mb(); 266 amdgpu_device_flush_hdp(adev, NULL); 267 for (i = 0; i < adev->num_vmhubs; i++) 268 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0); 269 } 270 271 /** 272 * amdgpu_gart_init - init the driver info for managing the gart 273 * 274 * @adev: amdgpu_device pointer 275 * 276 * Allocate the dummy page and init the gart driver info (all asics). 277 * Returns 0 for success, error for failure. 278 */ 279 int amdgpu_gart_init(struct amdgpu_device *adev) 280 { 281 int r; 282 283 if (adev->dummy_page_addr) 284 return 0; 285 286 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */ 287 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) { 288 DRM_ERROR("Page size is smaller than GPU page size!\n"); 289 return -EINVAL; 290 } 291 r = amdgpu_gart_dummy_page_init(adev); 292 if (r) 293 return r; 294 /* Compute table size */ 295 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE; 296 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE; 297 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n", 298 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages); 299 300 return 0; 301 } 302