components/openindiana/drm/drm/i915/src/i915_gem_stolen.c

   1 /*
   2  * Copyright © 2008-2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *    Chris Wilson <chris@chris-wilson.co.uk>
  26  *
  27  */
  28
  29 /*
  30  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
  31  */
  32
  33 #include "drmP.h"
  34 #include "i915_drm.h"
  35 #include "i915_drv.h"
  36
  37 /*
  38  * The BIOS typically reserves some of the system's memory for the exclusive
  39  * use of the integrated graphics. This memory is no longer available for
  40  * use by the OS and so the user finds that his system has less memory
  41  * available than he put in. We refer to this memory as stolen.
  42  *
  43  * The BIOS will allocate its framebuffer from the stolen memory. Our
  44  * goal is try to reuse that object for our own fbcon which must always
  45  * be available for panics. Anything else we can reuse the stolen memory
  46  * for is a boon.
  47  */
  48
  49 static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  50 {
  51         struct pci_dev *pdev = dev->pdev;
  52         u32 base;
  53
  54         /* On the machines I have tested the Graphics Base of Stolen Memory
  55          * is unreliable, so on those compute the base by subtracting the
  56          * stolen memory from the Top of Low Usable DRAM which is where the
  57          * BIOS places the graphics stolen memory.
  58          *
  59          * On gen2, the layout is slightly different with the Graphics Segment
  60          * immediately following Top of Memory (or Top of Usable DRAM). Note
  61          * it appears that TOUD is only reported by 865g, so we just use the
  62          * top of memory as determined by the e820 probe.
  63          *
  64          * XXX gen2 requires an unavailable symbol and 945gm fails with
  65          * its value of TOLUD.
  66          */
  67         base = 0;
  68         if (IS_VALLEYVIEW(dev)) {
  69                 pci_read_config_dword(dev->pdev, 0x5c, &base);
  70                 base &= ~((1<<20) - 1);
  71         } else if (INTEL_INFO(dev)->gen >= 6) {
  72                 /* Read Base Data of Stolen Memory Register (BDSM) directly.
  73                  * Note that there is also a MCHBAR miror at 0x1080c0 or
  74                  * we could use device 2:0x5c instead.
  75                 */
  76                 pci_read_config_dword(pdev, 0xB0, &base);
  77                 base &= ~4095; /* lower bits used for locking register */
  78         } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
  79                 /* Read Graphics Base of Stolen Memory directly */
  80                 pci_read_config_dword(pdev, 0xA4, &base);
  81 #if 0
  82         } else if (IS_GEN3(dev)) {
  83                 u8 val;
  84                 /* Stolen is immediately below Top of Low Usable DRAM */
  85                 pci_read_config_byte(pdev, 0x9c, &val);
  86                 base = val >> 3 << 27;
  87                 base -= dev_priv->mm.gtt->stolen_size;
  88         } else {
  89                 /* Stolen is immediately above Top of Memory */
  90                 base = max_low_pfn_mapped << PAGE_SHIFT;
  91 #endif
  92         }
  93
  94         return base;
  95 }
  96
  97 static int i915_setup_compression(struct drm_device *dev, int size)
  98 {
  99         struct drm_i915_private *dev_priv = dev->dev_private;
 100         struct drm_mm_node *compressed_fb, *compressed_llb;
 101
 102         /* Try to over-allocate to reduce reallocations and fragmentation */
 103         compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
 104                                            size <<= 1, 4096, 0);
 105         if (!compressed_fb)
 106                 compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
 107                                                    size >>= 1, 4096, 0);
 108         if (compressed_fb)
 109                 compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
 110         if (!compressed_fb)
 111                 goto err;
 112
 113         if (HAS_PCH_SPLIT(dev))
 114                 I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
 115         else if (IS_GM45(dev)) {
 116                 I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
 117         } else {
 118                 compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
 119                                                     4096, 4096, 0);
 120                 if (compressed_llb)
 121                         compressed_llb = drm_mm_get_block(compressed_llb,
 122                                                           4096, 4096);
 123                 if (!compressed_llb)
 124                         goto err_fb;
 125
 126                 dev_priv->compressed_llb = compressed_llb;
 127
 128                 I915_WRITE(FBC_CFB_BASE,
 129                            dev_priv->mm.stolen_base + compressed_fb->start);
 130                 I915_WRITE(FBC_LL_BASE,
 131                            dev_priv->mm.stolen_base + compressed_llb->start);
 132         }
 133
 134         dev_priv->compressed_fb = compressed_fb;
 135         dev_priv->cfb_size = size;
 136
 137         DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
 138                       size);
 139
 140         return 0;
 141
 142 err_fb:
 143         drm_mm_put_block(compressed_fb);
 144 err:
 145         return -ENOSPC;
 146 }
 147
 148 int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)
 149 {
 150         struct drm_i915_private *dev_priv = dev->dev_private;
 151
 152         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 153                 return -ENODEV;
 154
 155         if (size < dev_priv->cfb_size)
 156                 return 0;
 157
 158         /* Release any current block */
 159         i915_gem_stolen_cleanup_compression(dev);
 160
 161         return i915_setup_compression(dev, size);
 162 }
 163
 164 void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
 165 {
 166         struct drm_i915_private *dev_priv = dev->dev_private;
 167
 168         if (dev_priv->cfb_size == 0)
 169                 return;
 170
 171         if (dev_priv->compressed_fb)
 172                 drm_mm_put_block(dev_priv->compressed_fb);
 173
 174         if (dev_priv->compressed_llb)
 175                 drm_mm_put_block(dev_priv->compressed_llb);
 176
 177         dev_priv->cfb_size = 0;
 178 }
 179
 180 void i915_gem_cleanup_stolen(struct drm_device *dev)
 181 {
 182         struct drm_i915_private *dev_priv = dev->dev_private;
 183
 184         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 185                 return;
 186
 187         i915_gem_stolen_cleanup_compression(dev);
 188         drm_mm_takedown(&dev_priv->mm.stolen);
 189 }
 190
 191 int i915_gem_init_stolen(struct drm_device *dev)
 192 {
 193         struct drm_i915_private *dev_priv = dev->dev_private;
 194         int bios_reserved = 0;
 195
 196         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
 197         if (dev_priv->mm.stolen_base == 0)
 198                 return 0;
 199
 200         DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
 201                       dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
 202
 203         if (IS_VALLEYVIEW(dev))
 204                 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
 205
 206         /* Basic memrange allocator for stolen space */
 207         drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
 208                     bios_reserved);
 209
 210         return 0;
 211 }
 212
 213 #if 0
 214 static struct sg_table *
 215 i915_pages_create_for_stolen(struct drm_device *dev,
 216                              u32 offset, u32 size)
 217 {
 218         struct drm_i915_private *dev_priv = dev->dev_private;
 219         caddr_t *page_list;
 220
 221         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
 222         BUG_ON(offset > dev_priv->gtt.stolen_size - size);
 223
 224         /* We hide that we have no struct page backing our stolen object
 225          * by wrapping the contiguous physical allocation with a fake
 226          * dma mapping in a single scatterlist.
 227          */
 228
 229         page_list = kmem_zalloc(btop(size) * sizeof(caddr_t), KM_SLEEP);
 230         st = kmalloc(sizeof(*st), GFP_KERNEL);
 231         if (st == NULL)
 232                 return NULL;
 233
 234         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
 235                 kfree(st);
 236                 return NULL;
 237         }
 238
 239         sg = st->sgl;
 240         sg->offset = offset;
 241         sg->length = size;
 242
 243         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
 244         sg_dma_len(sg) = size;
 245
 246         return st;
 247 }
 248 #endif
 249
 250 static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
 251 {
 252         BUG();
 253         return -EINVAL;
 254 }
 255
 256 static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
 257 {
 258         /* Should only be called during free */
 259 }
 260
 261 static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
 262         .get_pages = i915_gem_object_get_pages_stolen,
 263         .put_pages = i915_gem_object_put_pages_stolen,
 264 };
 265
 266
 267 static struct drm_i915_gem_object *
 268 _i915_gem_object_create_stolen(struct drm_device *dev,
 269                                struct drm_mm_node *stolen)
 270 {
 271 #if 0
 272         struct drm_i915_gem_object *obj;
 273
 274         obj = i915_gem_object_alloc(dev);
 275         if (obj == NULL)
 276                 return NULL;
 277
 278         if (drm_gem_private_object_init(dev, &obj->base, stolen->size))
 279                 goto cleanup;
 280
 281         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
 282
 283         obj->page_list = i915_pages_create_for_stolen(dev,
 284                                                   stolen->start, stolen->size);
 285         if (obj->pages == NULL)
 286                 goto cleanup;
 287
 288         obj->has_dma_mapping = true;
 289         i915_gem_object_pin_pages(obj);
 290         obj->stolen = stolen;
 291
 292         obj->base.write_domain = I915_GEM_DOMAIN_GTT;
 293         obj->base.read_domains = I915_GEM_DOMAIN_GTT;
 294         obj->cache_level = I915_CACHE_NONE;
 295
 296         return obj;
 297
 298 cleanup:
 299         i915_gem_object_free(obj);
 300 #endif
 301         return NULL;
 302 }
 303
 304
 305 struct drm_i915_gem_object *
 306 i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
 307 {
 308         DRM_DEBUG_KMS("Not support stolen object yet");
 309         return NULL;
 310 #if 0
 311         struct drm_i915_private *dev_priv = dev->dev_private;
 312         struct drm_i915_gem_object *obj;
 313         struct drm_mm_node *stolen;
 314
 315         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 316                 return NULL;
 317
 318         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
 319         if (size == 0)
 320                 return NULL;
 321
 322         stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
 323         if (stolen)
 324                 stolen = drm_mm_get_block(stolen, size, 4096);
 325         if (stolen == NULL)
 326                 return NULL;
 327
 328         obj = _i915_gem_object_create_stolen(dev, stolen);
 329         if (obj)
 330                 return obj;
 331
 332         drm_mm_put_block(stolen);
 333         return NULL;
 334 #endif
 335 }
 336
 337 struct drm_i915_gem_object *
 338 i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 339                                                u32 stolen_offset,
 340                                                u32 gtt_offset,
 341                                                u32 size)
 342 {
 343         struct drm_i915_private *dev_priv = dev->dev_private;
 344         struct drm_i915_gem_object *obj;
 345         struct drm_mm_node *stolen;
 346
 347         if (!drm_mm_initialized(&dev_priv->mm.stolen))
 348                 return NULL;
 349
 350         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
 351                         stolen_offset, gtt_offset, size);
 352
 353         /* KISS and expect everything to be page-aligned */
 354         BUG_ON(stolen_offset & 4095);
 355         BUG_ON(size & 4095);
 356
 357         if (size == 0)
 358                 return NULL;
 359
 360         stolen = drm_mm_create_block(&dev_priv->mm.stolen,
 361                                      stolen_offset, size,
 362                                      false);
 363         if (stolen == NULL) {
 364                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
 365                 return NULL;
 366         }
 367
 368         obj = _i915_gem_object_create_stolen(dev, stolen);
 369         if (obj == NULL) {
 370                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
 371                 drm_mm_put_block(stolen);
 372                 return NULL;
 373         }
 374
 375         /* Some objects just need physical mem from stolen space */
 376         if (gtt_offset == 0xffffffff)
 377                 return obj;
 378
 379         /* To simplify the initialisation sequence between KMS and GTT,
 380          * we allow construction of the stolen object prior to
 381          * setting up the GTT space. The actual reservation will occur
 382          * later.
 383          */
 384         if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
 385                 obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
 386                                                      gtt_offset, size,
 387                                                      false);
 388                 if (obj->gtt_space == NULL) {
 389                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
 390                         drm_gem_object_unreference(&obj->base);
 391                         return NULL;
 392                 }
 393         } else
 394                 obj->gtt_space = I915_GTT_RESERVED;
 395
 396         obj->gtt_offset = gtt_offset;
 397         obj->has_global_gtt_mapping = 1;
 398
 399         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list, (caddr_t)obj);
 400         list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list, (caddr_t)obj);
 401
 402         return obj;
 403 }
 404
 405 void
 406 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 407 {
 408         if (obj->stolen) {
 409                 drm_mm_put_block(obj->stolen);
 410                 obj->stolen = NULL;
 411         }
 412 }