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 #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, 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
 169         if (!r) {
 170                 int i;
 171
 172                 /* We might have dropped some GART table updates while it wasn't
 173                  * mapped, restore all entries
 174                  */
 175                 for (i = 0; i < rdev->gart.num_gpu_pages; i++)
 176                         radeon_gart_set_page(rdev, i, rdev->gart.pages_entry[i]);
 177                 mb();
 178                 radeon_gart_tlb_flush(rdev);
 179         }
 180
 181         return r;
 182 }
 183
 184 /**
 185  * radeon_gart_table_vram_unpin - unpin gart page table in vram
 186  *
 187  * @rdev: radeon_device pointer
 188  *
 189  * Unpin the GART page table in vram (pcie r4xx, r5xx+).
 190  * These asics require the gart table to be in video memory.
 191  */
 192 void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
 193 {
 194         int r;
 195
 196         if (rdev->gart.robj == NULL) {
 197                 return;
 198         }
 199         r = radeon_bo_reserve(rdev->gart.robj, false);
 200         if (likely(r == 0)) {
 201                 radeon_bo_kunmap(rdev->gart.robj);
 202                 radeon_bo_unpin(rdev->gart.robj);
 203                 radeon_bo_unreserve(rdev->gart.robj);
 204                 rdev->gart.ptr = NULL;
 205         }
 206 }
 207
 208 /**
 209  * radeon_gart_table_vram_free - free gart page table vram
 210  *
 211  * @rdev: radeon_device pointer
 212  *
 213  * Free the video memory used for the GART page table
 214  * (pcie r4xx, r5xx+).  These asics require the gart table to
 215  * be in video memory.
 216  */
 217 void radeon_gart_table_vram_free(struct radeon_device *rdev)
 218 {
 219         if (rdev->gart.robj == NULL) {
 220                 return;
 221         }
 222         radeon_bo_unref(&rdev->gart.robj);
 223 }
 224
 225 /*
 226  * Common gart functions.
 227  */
 228 /**
 229  * radeon_gart_unbind - unbind pages from the gart page table
 230  *
 231  * @rdev: radeon_device pointer
 232  * @offset: offset into the GPU's gart aperture
 233  * @pages: number of pages to unbind
 234  *
 235  * Unbinds the requested pages from the gart page table and
 236  * replaces them with the dummy page (all asics).
 237  */
 238 void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
 239                         int pages)
 240 {
 241         unsigned t;
 242         unsigned p;
 243         int i, j;
 244
 245         if (!rdev->gart.ready) {
 246                 WARN(1, "trying to unbind memory from uninitialized GART !\n");
 247                 return;
 248         }
 249         t = offset / RADEON_GPU_PAGE_SIZE;
 250         p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 251         for (i = 0; i < pages; i++, p++) {
 252                 if (rdev->gart.pages[p]) {
 253                         rdev->gart.pages[p] = NULL;
 254                         for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
 255                                 rdev->gart.pages_entry[t] = rdev->dummy_page.entry;
 256                                 if (rdev->gart.ptr) {
 257                                         radeon_gart_set_page(rdev, t,
 258                                                              rdev->dummy_page.entry);
 259                                 }
 260                         }
 261                 }
 262         }
 263         if (rdev->gart.ptr) {
 264                 mb();
 265                 radeon_gart_tlb_flush(rdev);
 266         }
 267 }
 268
 269 /**
 270  * radeon_gart_bind - bind pages into the gart page table
 271  *
 272  * @rdev: radeon_device pointer
 273  * @offset: offset into the GPU's gart aperture
 274  * @pages: number of pages to bind
 275  * @pagelist: pages to bind
 276  * @dma_addr: DMA addresses of pages
 277  * @flags: RADEON_GART_PAGE_* flags
 278  *
 279  * Binds the requested pages to the gart page table
 280  * (all asics).
 281  * Returns 0 for success, -EINVAL for failure.
 282  */
 283 int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
 284                      int pages, struct page **pagelist, dma_addr_t *dma_addr,
 285                      uint32_t flags)
 286 {
 287         unsigned t;
 288         unsigned p;
 289         uint64_t page_base, page_entry;
 290         int i, j;
 291
 292         if (!rdev->gart.ready) {
 293                 WARN(1, "trying to bind memory to uninitialized GART !\n");
 294                 return -EINVAL;
 295         }
 296         t = offset / RADEON_GPU_PAGE_SIZE;
 297         p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 298
 299         for (i = 0; i < pages; i++, p++) {
 300                 rdev->gart.pages[p] = pagelist[i];
 301                 page_base = dma_addr[i];
 302                 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
 303                         page_entry = radeon_gart_get_page_entry(page_base, flags);
 304                         rdev->gart.pages_entry[t] = page_entry;
 305                         if (rdev->gart.ptr) {
 306                                 radeon_gart_set_page(rdev, t, page_entry);
 307                         }
 308                         page_base += RADEON_GPU_PAGE_SIZE;
 309                 }
 310         }
 311         if (rdev->gart.ptr) {
 312                 mb();
 313                 radeon_gart_tlb_flush(rdev);
 314         }
 315         return 0;
 316 }
 317
 318 /**
 319  * radeon_gart_init - init the driver info for managing the gart
 320  *
 321  * @rdev: radeon_device pointer
 322  *
 323  * Allocate the dummy page and init the gart driver info (all asics).
 324  * Returns 0 for success, error for failure.
 325  */
 326 int radeon_gart_init(struct radeon_device *rdev)
 327 {
 328         int r, i;
 329
 330         if (rdev->gart.pages) {
 331                 return 0;
 332         }
 333         /* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */
 334         if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) {
 335                 DRM_ERROR("Page size is smaller than GPU page size!\n");
 336                 return -EINVAL;
 337         }
 338         r = radeon_dummy_page_init(rdev);
 339         if (r)
 340                 return r;
 341         /* Compute table size */
 342         rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE;
 343         rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE;
 344         DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
 345                  rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages);
 346         /* Allocate pages table */
 347         rdev->gart.pages = vzalloc(sizeof(void *) * rdev->gart.num_cpu_pages);
 348         if (rdev->gart.pages == NULL) {
 349                 radeon_gart_fini(rdev);
 350                 return -ENOMEM;
 351         }
 352         rdev->gart.pages_entry = vmalloc(sizeof(uint64_t) *
 353                                          rdev->gart.num_gpu_pages);
 354         if (rdev->gart.pages_entry == NULL) {
 355                 radeon_gart_fini(rdev);
 356                 return -ENOMEM;
 357         }
 358         /* set GART entry to point to the dummy page by default */
 359         for (i = 0; i < rdev->gart.num_gpu_pages; i++)
 360                 rdev->gart.pages_entry[i] = rdev->dummy_page.entry;
 361         return 0;
 362 }
 363
 364 /**
 365  * radeon_gart_fini - tear down the driver info for managing the gart
 366  *
 367  * @rdev: radeon_device pointer
 368  *
 369  * Tear down the gart driver info and free the dummy page (all asics).
 370  */
 371 void radeon_gart_fini(struct radeon_device *rdev)
 372 {
 373         if (rdev->gart.ready) {
 374                 /* unbind pages */
 375                 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);
 376         }
 377         rdev->gart.ready = false;
 378         vfree(rdev->gart.pages);
 379         vfree(rdev->gart.pages_entry);
 380         rdev->gart.pages = NULL;
 381         rdev->gart.pages_entry = NULL;
 382
 383         radeon_dummy_page_fini(rdev);
 384 }