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  1. /*
  2.  * Copyright © 2008-2012 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. #include <drm/drmP.h>
  30. #include <drm/i915_drm.h>
  31. #include "i915_drv.h"
  32.  
  33. /*
  34.  * The BIOS typically reserves some of the system's memory for the exclusive
  35.  * use of the integrated graphics. This memory is no longer available for
  36.  * use by the OS and so the user finds that his system has less memory
  37.  * available than he put in. We refer to this memory as stolen.
  38.  *
  39.  * The BIOS will allocate its framebuffer from the stolen memory. Our
  40.  * goal is try to reuse that object for our own fbcon which must always
  41.  * be available for panics. Anything else we can reuse the stolen memory
  42.  * for is a boon.
  43.  */
  44.  
  45. static unsigned long i915_stolen_to_physical(struct drm_device *dev)
  46. {
  47.         struct drm_i915_private *dev_priv = dev->dev_private;
  48.         struct resource *r;
  49.         u32 base;
  50.  
  51.         /* Almost universally we can find the Graphics Base of Stolen Memory
  52.          * at offset 0x5c in the igfx configuration space. On a few (desktop)
  53.          * machines this is also mirrored in the bridge device at different
  54.          * locations, or in the MCHBAR. On gen2, the layout is again slightly
  55.          * different with the Graphics Segment immediately following Top of
  56.          * Memory (or Top of Usable DRAM). Note it appears that TOUD is only
  57.          * reported by 865g, so we just use the top of memory as determined
  58.          * by the e820 probe.
  59.          *
  60.          * XXX However gen2 requires an unavailable symbol.
  61.          */
  62.         base = 0;
  63.         if (INTEL_INFO(dev)->gen >= 3) {
  64.                 /* Read Graphics Base of Stolen Memory directly */
  65.                 pci_read_config_dword(dev->pdev, 0x5c, &base);
  66.                 base &= ~((1<<20) - 1);
  67.         } else { /* GEN2 */
  68. #if 0
  69.                 /* Stolen is immediately above Top of Memory */
  70.                 base = max_low_pfn_mapped << PAGE_SHIFT;
  71. #endif
  72.         }
  73.  
  74.         if (base == 0)
  75.                 return 0;
  76. #if 0
  77.         /* Verify that nothing else uses this physical address. Stolen
  78.          * memory should be reserved by the BIOS and hidden from the
  79.          * kernel. So if the region is already marked as busy, something
  80.          * is seriously wrong.
  81.          */
  82.         r = devm_request_mem_region(dev->dev, base, dev_priv->gtt.stolen_size,
  83.                                     "Graphics Stolen Memory");
  84.         if (r == NULL) {
  85.                 DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n",
  86.                           base, base + (uint32_t)dev_priv->gtt.stolen_size);
  87.                 base = 0;
  88.         }
  89. #endif
  90.         return base;
  91. }
  92.  
  93. static int i915_setup_compression(struct drm_device *dev, int size)
  94. {
  95.         struct drm_i915_private *dev_priv = dev->dev_private;
  96.         struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
  97.         int ret;
  98.  
  99.         compressed_fb = kzalloc(sizeof(*compressed_fb), GFP_KERNEL);
  100.         if (!compressed_fb)
  101.                 goto err_llb;
  102.  
  103.         /* Try to over-allocate to reduce reallocations and fragmentation */
  104.         ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb,
  105.                                  size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
  106.         if (ret)
  107.                 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_fb,
  108.                                          size >>= 1, 4096,
  109.                                          DRM_MM_SEARCH_DEFAULT);
  110.         if (ret)
  111.                 goto err_llb;
  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 = kzalloc(sizeof(*compressed_llb), GFP_KERNEL);
  119.                 if (!compressed_llb)
  120.                         goto err_fb;
  121.  
  122.                 ret = drm_mm_insert_node(&dev_priv->mm.stolen, compressed_llb,
  123.                                          4096, 4096, DRM_MM_SEARCH_DEFAULT);
  124.                 if (ret)
  125.                         goto err_fb;
  126.  
  127.                 dev_priv->fbc.compressed_llb = compressed_llb;
  128.  
  129.                 I915_WRITE(FBC_CFB_BASE,
  130.                            dev_priv->mm.stolen_base + compressed_fb->start);
  131.                 I915_WRITE(FBC_LL_BASE,
  132.                            dev_priv->mm.stolen_base + compressed_llb->start);
  133.         }
  134.  
  135.         dev_priv->fbc.compressed_fb = compressed_fb;
  136.         dev_priv->fbc.size = size;
  137.  
  138.         DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
  139.                       size);
  140.  
  141.         return 0;
  142.  
  143. err_fb:
  144.         kfree(compressed_llb);
  145.         drm_mm_remove_node(compressed_fb);
  146. err_llb:
  147.         kfree(compressed_fb);
  148. //   pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
  149.         return -ENOSPC;
  150. }
  151.  
  152. int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)
  153. {
  154.         struct drm_i915_private *dev_priv = dev->dev_private;
  155.  
  156.         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  157.                 return -ENODEV;
  158.  
  159.         if (size < dev_priv->fbc.size)
  160.                 return 0;
  161.  
  162.         /* Release any current block */
  163.         i915_gem_stolen_cleanup_compression(dev);
  164.  
  165.         return i915_setup_compression(dev, size);
  166. }
  167.  
  168. void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
  169. {
  170.         struct drm_i915_private *dev_priv = dev->dev_private;
  171.  
  172.         if (dev_priv->fbc.size == 0)
  173.                 return;
  174.  
  175.         if (dev_priv->fbc.compressed_fb) {
  176.                 drm_mm_remove_node(dev_priv->fbc.compressed_fb);
  177.                 kfree(dev_priv->fbc.compressed_fb);
  178.         }
  179.  
  180.         if (dev_priv->fbc.compressed_llb) {
  181.                 drm_mm_remove_node(dev_priv->fbc.compressed_llb);
  182.                 kfree(dev_priv->fbc.compressed_llb);
  183.         }
  184.  
  185.         dev_priv->fbc.size = 0;
  186. }
  187.  
  188. void i915_gem_cleanup_stolen(struct drm_device *dev)
  189. {
  190.         struct drm_i915_private *dev_priv = dev->dev_private;
  191.  
  192.         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  193.                 return;
  194.  
  195.         i915_gem_stolen_cleanup_compression(dev);
  196.         drm_mm_takedown(&dev_priv->mm.stolen);
  197. }
  198.  
  199. int i915_gem_init_stolen(struct drm_device *dev)
  200. {
  201.         struct drm_i915_private *dev_priv = dev->dev_private;
  202.         int bios_reserved = 0;
  203.  
  204.         if (dev_priv->gtt.stolen_size == 0)
  205.                 return 0;
  206.  
  207.         dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
  208.         if (dev_priv->mm.stolen_base == 0)
  209.                 return 0;
  210.  
  211.         DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
  212.                       dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
  213.  
  214.         if (IS_VALLEYVIEW(dev))
  215.                 bios_reserved = 1024*1024; /* top 1M on VLV/BYT */
  216.  
  217.         if (WARN_ON(bios_reserved > dev_priv->gtt.stolen_size))
  218.                 return 0;
  219.  
  220.         /* Basic memrange allocator for stolen space */
  221.         drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size -
  222.                     bios_reserved);
  223.  
  224.         return 0;
  225. }
  226.  
  227. static struct sg_table *
  228. i915_pages_create_for_stolen(struct drm_device *dev,
  229.                              u32 offset, u32 size)
  230. {
  231.         struct drm_i915_private *dev_priv = dev->dev_private;
  232.         struct sg_table *st;
  233.         struct scatterlist *sg;
  234.  
  235.         DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
  236.         BUG_ON(offset > dev_priv->gtt.stolen_size - size);
  237.  
  238.         /* We hide that we have no struct page backing our stolen object
  239.          * by wrapping the contiguous physical allocation with a fake
  240.          * dma mapping in a single scatterlist.
  241.          */
  242.  
  243.         st = kmalloc(sizeof(*st), GFP_KERNEL);
  244.         if (st == NULL)
  245.                 return NULL;
  246.  
  247.         if (sg_alloc_table(st, 1, GFP_KERNEL)) {
  248.                 kfree(st);
  249.                 return NULL;
  250.         }
  251.  
  252.         sg = st->sgl;
  253.         sg->offset = offset;
  254.         sg->length = size;
  255.  
  256.         sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
  257.         sg_dma_len(sg) = size;
  258.  
  259.         return st;
  260. }
  261.  
  262. static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
  263. {
  264.         BUG();
  265.         return -EINVAL;
  266. }
  267.  
  268. static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
  269. {
  270.         /* Should only be called during free */
  271.         sg_free_table(obj->pages);
  272.         kfree(obj->pages);
  273. }
  274.  
  275. static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
  276.         .get_pages = i915_gem_object_get_pages_stolen,
  277.         .put_pages = i915_gem_object_put_pages_stolen,
  278. };
  279.  
  280. static struct drm_i915_gem_object *
  281. _i915_gem_object_create_stolen(struct drm_device *dev,
  282.                                struct drm_mm_node *stolen)
  283. {
  284.         struct drm_i915_gem_object *obj;
  285.  
  286.         obj = i915_gem_object_alloc(dev);
  287.         if (obj == NULL)
  288.                 return NULL;
  289.  
  290.         drm_gem_private_object_init(dev, &obj->base, stolen->size);
  291.         i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
  292.  
  293.         obj->pages = i915_pages_create_for_stolen(dev,
  294.                                                   stolen->start, stolen->size);
  295.         if (obj->pages == NULL)
  296.                 goto cleanup;
  297.  
  298.         obj->has_dma_mapping = true;
  299.         i915_gem_object_pin_pages(obj);
  300.         obj->stolen = stolen;
  301.  
  302.         obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
  303.         obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
  304.  
  305.         return obj;
  306.  
  307. cleanup:
  308.         i915_gem_object_free(obj);
  309.         return NULL;
  310. }
  311.  
  312. struct drm_i915_gem_object *
  313. i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
  314. {
  315.         struct drm_i915_private *dev_priv = dev->dev_private;
  316.         struct drm_i915_gem_object *obj;
  317.         struct drm_mm_node *stolen;
  318.         int ret;
  319.  
  320.         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  321.                 return NULL;
  322.  
  323.         DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
  324.         if (size == 0)
  325.                 return NULL;
  326.  
  327.         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
  328.         if (!stolen)
  329.                 return NULL;
  330.  
  331.         ret = drm_mm_insert_node(&dev_priv->mm.stolen, stolen, size,
  332.                                  4096, DRM_MM_SEARCH_DEFAULT);
  333.         if (ret) {
  334.                 kfree(stolen);
  335.                 return NULL;
  336.         }
  337.  
  338.         obj = _i915_gem_object_create_stolen(dev, stolen);
  339.         if (obj)
  340.                 return obj;
  341.  
  342.         drm_mm_remove_node(stolen);
  343.         kfree(stolen);
  344.         return NULL;
  345. }
  346.  
  347. struct drm_i915_gem_object *
  348. i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
  349.                                                u32 stolen_offset,
  350.                                                u32 gtt_offset,
  351.                                                u32 size)
  352. {
  353.         struct drm_i915_private *dev_priv = dev->dev_private;
  354.         struct i915_address_space *ggtt = &dev_priv->gtt.base;
  355.         struct drm_i915_gem_object *obj;
  356.         struct drm_mm_node *stolen;
  357.         struct i915_vma *vma;
  358.         int ret;
  359.  
  360.         if (!drm_mm_initialized(&dev_priv->mm.stolen))
  361.                 return NULL;
  362.  
  363.         DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
  364.                         stolen_offset, gtt_offset, size);
  365.  
  366.         /* KISS and expect everything to be page-aligned */
  367.         BUG_ON(stolen_offset & 4095);
  368.         BUG_ON(size & 4095);
  369.  
  370.         if (WARN_ON(size == 0))
  371.                 return NULL;
  372.  
  373.         stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
  374.         if (!stolen)
  375.                 return NULL;
  376.  
  377.         stolen->start = stolen_offset;
  378.         stolen->size = size;
  379.         ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen);
  380.         if (ret) {
  381.                 DRM_DEBUG_KMS("failed to allocate stolen space\n");
  382.                 kfree(stolen);
  383.                 return NULL;
  384.         }
  385.  
  386.         obj = _i915_gem_object_create_stolen(dev, stolen);
  387.         if (obj == NULL) {
  388.                 DRM_DEBUG_KMS("failed to allocate stolen object\n");
  389.                 drm_mm_remove_node(stolen);
  390.                 kfree(stolen);
  391.                 return NULL;
  392.         }
  393.  
  394.         /* Some objects just need physical mem from stolen space */
  395.         if (gtt_offset == I915_GTT_OFFSET_NONE)
  396.                 return obj;
  397.  
  398.         vma = i915_gem_vma_create(obj, ggtt);
  399.         if (IS_ERR(vma)) {
  400.                 ret = PTR_ERR(vma);
  401.                 goto err_out;
  402.         }
  403.  
  404.         /* To simplify the initialisation sequence between KMS and GTT,
  405.          * we allow construction of the stolen object prior to
  406.          * setting up the GTT space. The actual reservation will occur
  407.          * later.
  408.          */
  409.         vma->node.start = gtt_offset;
  410.         vma->node.size = size;
  411.         if (drm_mm_initialized(&ggtt->mm)) {
  412.                 ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);
  413.                 if (ret) {
  414.                         DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
  415.                         goto err_vma;
  416.                 }
  417.                 }
  418.  
  419.         obj->has_global_gtt_mapping = 1;
  420.  
  421.         list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
  422.         list_add_tail(&vma->mm_list, &ggtt->inactive_list);
  423.  
  424.         return obj;
  425.  
  426. err_vma:
  427.         i915_gem_vma_destroy(vma);
  428. err_out:
  429.         drm_mm_remove_node(stolen);
  430.         kfree(stolen);
  431.         drm_gem_object_unreference(&obj->base);
  432.         return NULL;
  433. }
  434.  
  435. void
  436. i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
  437. {
  438.         if (obj->stolen) {
  439.                 drm_mm_remove_node(obj->stolen);
  440.                 kfree(obj->stolen);
  441.                 obj->stolen = NULL;
  442.         }
  443. }
  444.