drivers/gpu/drm/radeon/radeon_gart.c

   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 = pci_alloc_consistent(rdev->pdev, rdev->gart.table_size,
  76                                    &rdev->gart.table_addr);
  77         if (ptr == NULL) {
  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         memset((void *)rdev->gart.ptr, 0, rdev->gart.table_size);
  89         return 0;
  90 }
  91
  92 /**
  93  * radeon_gart_table_ram_free - free system ram for gart page table
  94  *
  95  * @rdev: radeon_device pointer
  96  *
  97  * Free system memory for GART page table
  98  * (r1xx-r3xx, non-pcie r4xx, rs400).  These asics require the
  99  * gart table to be in system memory.
 100  */
 101 void radeon_gart_table_ram_free(struct radeon_device *rdev)
 102 {
 103         if (rdev->gart.ptr == NULL) {
 104                 return;
 105         }
 106 #ifdef CONFIG_X86
 107         if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
 108             rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
 109                 set_memory_wb((unsigned long)rdev->gart.ptr,
 110                               rdev->gart.table_size >> PAGE_SHIFT);
 111         }
 112 #endif
 113         pci_free_consistent(rdev->pdev, rdev->gart.table_size,
 114                             (void *)rdev->gart.ptr,
 115                             rdev->gart.table_addr);
 116         rdev->gart.ptr = NULL;
 117         rdev->gart.table_addr = 0;
 118 }
 119
 120 /**
 121  * radeon_gart_table_vram_alloc - allocate vram for gart page table
 122  *
 123  * @rdev: radeon_device pointer
 124  *
 125  * Allocate video memory for GART page table
 126  * (pcie r4xx, r5xx+).  These asics require the
 127  * gart table to be in video memory.
 128  * Returns 0 for success, error for failure.
 129  */
 130 int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
 131 {
 132         int r;
 133
 134         if (rdev->gart.robj == NULL) {
 135                 r = radeon_bo_create(rdev, rdev->gart.table_size,
 136                                      PAGE_SIZE, true, RADEON_GEM_DOMAIN_VRAM,
 137                                      0, NULL, NULL, &rdev->gart.robj);
 138                 if (r) {
 139                         return r;
 140                 }
 141         }
 142         return 0;
 143 }
 144
 145 /**
 146  * radeon_gart_table_vram_pin - pin gart page table in vram
 147  *
 148  * @rdev: radeon_device pointer
 149  *
 150  * Pin the GART page table in vram so it will not be moved
 151  * by the memory manager (pcie r4xx, r5xx+).  These asics require the
 152  * gart table to be in video memory.
 153  * Returns 0 for success, error for failure.
 154  */
 155 int radeon_gart_table_vram_pin(struct radeon_device *rdev)
 156 {
 157         uint64_t gpu_addr;
 158         int r;
 159
 160         r = radeon_bo_reserve(rdev->gart.robj, false);
 161         if (unlikely(r != 0))
 162                 return r;
 163         r = radeon_bo_pin(rdev->gart.robj,
 164                                 RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
 165         if (r) {
 166                 radeon_bo_unreserve(rdev->gart.robj);
 167                 return r;
 168         }
 169         r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr);
 170         if (r)
 171                 radeon_bo_unpin(rdev->gart.robj);
 172         radeon_bo_unreserve(rdev->gart.robj);
 173         rdev->gart.table_addr = gpu_addr;
 174
 175         if (!r) {
 176                 int i;
 177
 178                 /* We might have dropped some GART table updates while it wasn't
 179                  * mapped, restore all entries
 180                  */
 181                 for (i = 0; i < rdev->gart.num_gpu_pages; i++)
 182                         radeon_gart_set_page(rdev, i, rdev->gart.pages_entry[i]);
 183                 mb();
 184                 radeon_gart_tlb_flush(rdev);
 185         }
 186
 187         return r;
 188 }
 189
 190 /**
 191  * radeon_gart_table_vram_unpin - unpin gart page table in vram
 192  *
 193  * @rdev: radeon_device pointer
 194  *
 195  * Unpin the GART page table in vram (pcie r4xx, r5xx+).
 196  * These asics require the gart table to be in video memory.
 197  */
 198 void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
 199 {
 200         int r;
 201
 202         if (rdev->gart.robj == NULL) {
 203                 return;
 204         }
 205         r = radeon_bo_reserve(rdev->gart.robj, false);
 206         if (likely(r == 0)) {
 207                 radeon_bo_kunmap(rdev->gart.robj);
 208                 radeon_bo_unpin(rdev->gart.robj);
 209                 radeon_bo_unreserve(rdev->gart.robj);
 210                 rdev->gart.ptr = NULL;
 211         }
 212 }
 213
 214 /**
 215  * radeon_gart_table_vram_free - free gart page table vram
 216  *
 217  * @rdev: radeon_device pointer
 218  *
 219  * Free the video memory used for the GART page table
 220  * (pcie r4xx, r5xx+).  These asics require the gart table to
 221  * be in video memory.
 222  */
 223 void radeon_gart_table_vram_free(struct radeon_device *rdev)
 224 {
 225         if (rdev->gart.robj == NULL) {
 226                 return;
 227         }
 228         radeon_bo_unref(&rdev->gart.robj);
 229 }
 230
 231 /*
 232  * Common gart functions.
 233  */
 234 /**
 235  * radeon_gart_unbind - unbind pages from the gart page table
 236  *
 237  * @rdev: radeon_device pointer
 238  * @offset: offset into the GPU's gart aperture
 239  * @pages: number of pages to unbind
 240  *
 241  * Unbinds the requested pages from the gart page table and
 242  * replaces them with the dummy page (all asics).
 243  */
 244 void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
 245                         int pages)
 246 {
 247         unsigned t;
 248         unsigned p;
 249         int i, j;
 250
 251         if (!rdev->gart.ready) {
 252                 WARN(1, "trying to unbind memory from uninitialized GART !\n");
 253                 return;
 254         }
 255         t = offset / RADEON_GPU_PAGE_SIZE;
 256         p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 257         for (i = 0; i < pages; i++, p++) {
 258                 if (rdev->gart.pages[p]) {
 259                         rdev->gart.pages[p] = NULL;
 260                         for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
 261                                 rdev->gart.pages_entry[t] = rdev->dummy_page.entry;
 262                                 if (rdev->gart.ptr) {
 263                                         radeon_gart_set_page(rdev, t,
 264                                                              rdev->dummy_page.entry);
 265                                 }
 266                         }
 267                 }
 268         }
 269         if (rdev->gart.ptr) {
 270                 mb();
 271                 radeon_gart_tlb_flush(rdev);
 272         }
 273 }
 274
 275 /**
 276  * radeon_gart_bind - bind pages into the gart page table
 277  *
 278  * @rdev: radeon_device pointer
 279  * @offset: offset into the GPU's gart aperture
 280  * @pages: number of pages to bind
 281  * @pagelist: pages to bind
 282  * @dma_addr: DMA addresses of pages
 283  * @flags: RADEON_GART_PAGE_* flags
 284  *
 285  * Binds the requested pages to the gart page table
 286  * (all asics).
 287  * Returns 0 for success, -EINVAL for failure.
 288  */
 289 int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
 290                      int pages, struct page **pagelist, dma_addr_t *dma_addr,
 291                      uint32_t flags)
 292 {
 293         unsigned t;
 294         unsigned p;
 295         uint64_t page_base, page_entry;
 296         int i, j;
 297
 298         if (!rdev->gart.ready) {
 299                 WARN(1, "trying to bind memory to uninitialized GART !\n");
 300                 return -EINVAL;
 301         }
 302         t = offset / RADEON_GPU_PAGE_SIZE;
 303         p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 304
 305         for (i = 0; i < pages; i++, p++) {
 306                 rdev->gart.pages[p] = pagelist[i];
 307                 page_base = dma_addr[i];
 308                 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
 309                         page_entry = radeon_gart_get_page_entry(page_base, flags);
 310                         rdev->gart.pages_entry[t] = page_entry;
 311                         if (rdev->gart.ptr) {
 312                                 radeon_gart_set_page(rdev, t, page_entry);
 313                         }
 314                         page_base += RADEON_GPU_PAGE_SIZE;
 315                 }
 316         }
 317         if (rdev->gart.ptr) {
 318                 mb();
 319                 radeon_gart_tlb_flush(rdev);
 320         }
 321         return 0;
 322 }
 323
 324 /**
 325  * radeon_gart_init - init the driver info for managing the gart
 326  *
 327  * @rdev: radeon_device pointer
 328  *
 329  * Allocate the dummy page and init the gart driver info (all asics).
 330  * Returns 0 for success, error for failure.
 331  */
 332 int radeon_gart_init(struct radeon_device *rdev)
 333 {
 334         int r, i;
 335
 336         if (rdev->gart.pages) {
 337                 return 0;
 338         }
 339         /* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */
 340         if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) {
 341                 DRM_ERROR("Page size is smaller than GPU page size!\n");
 342                 return -EINVAL;
 343         }
 344         r = radeon_dummy_page_init(rdev);
 345         if (r)
 346                 return r;
 347         /* Compute table size */
 348         rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE;
 349         rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE;
 350         DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
 351                  rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages);
 352         /* Allocate pages table */
 353         rdev->gart.pages = vzalloc(array_size(sizeof(void *),
 354                                    rdev->gart.num_cpu_pages));
 355         if (rdev->gart.pages == NULL) {
 356                 radeon_gart_fini(rdev);
 357                 return -ENOMEM;
 358         }
 359         rdev->gart.pages_entry = vmalloc(array_size(sizeof(uint64_t),
 360                                                     rdev->gart.num_gpu_pages));
 361         if (rdev->gart.pages_entry == NULL) {
 362                 radeon_gart_fini(rdev);
 363                 return -ENOMEM;
 364         }
 365         /* set GART entry to point to the dummy page by default */
 366         for (i = 0; i < rdev->gart.num_gpu_pages; i++)
 367                 rdev->gart.pages_entry[i] = rdev->dummy_page.entry;
 368         return 0;
 369 }
 370
 371 /**
 372  * radeon_gart_fini - tear down the driver info for managing the gart
 373  *
 374  * @rdev: radeon_device pointer
 375  *
 376  * Tear down the gart driver info and free the dummy page (all asics).
 377  */
 378 void radeon_gart_fini(struct radeon_device *rdev)
 379 {
 380         if (rdev->gart.ready) {
 381                 /* unbind pages */
 382                 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);
 383         }
 384         rdev->gart.ready = false;
 385         vfree(rdev->gart.pages);
 386         vfree(rdev->gart.pages_entry);
 387         rdev->gart.pages = NULL;
 388         rdev->gart.pages_entry = NULL;
 389
 390         radeon_dummy_page_fini(rdev);
 391 }