Subversion Repositories Kolibri OS

Rev

Rev 3480 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  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. #define PTE_ADDRESS_MASK                0xfffff000
  46. #define PTE_ADDRESS_MASK_HIGH           0x000000f0 /* i915+ */
  47. #define PTE_MAPPING_TYPE_UNCACHED       (0 << 1)
  48. #define PTE_MAPPING_TYPE_DCACHE         (1 << 1) /* i830 only */
  49. #define PTE_MAPPING_TYPE_CACHED         (3 << 1)
  50. #define PTE_MAPPING_TYPE_MASK           (3 << 1)
  51. #define PTE_VALID                       (1 << 0)
  52.  
  53. /**
  54.  * i915_stolen_to_phys - take an offset into stolen memory and turn it into
  55.  *                       a physical one
  56.  * @dev: drm device
  57.  * @offset: address to translate
  58.  *
  59.  * Some chip functions require allocations from stolen space and need the
  60.  * physical address of the memory in question.
  61.  */
  62. static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset)
  63. {
  64.         struct drm_i915_private *dev_priv = dev->dev_private;
  65.         struct pci_dev *pdev = dev_priv->bridge_dev;
  66.         u32 base;
  67.  
  68. #if 0
  69.         /* On the machines I have tested the Graphics Base of Stolen Memory
  70.          * is unreliable, so compute the base by subtracting the stolen memory
  71.          * from the Top of Low Usable DRAM which is where the BIOS places
  72.          * the graphics stolen memory.
  73.          */
  74.         if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
  75.                 /* top 32bits are reserved = 0 */
  76.                 pci_read_config_dword(pdev, 0xA4, &base);
  77.         } else {
  78.                 /* XXX presume 8xx is the same as i915 */
  79.                 pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base);
  80.         }
  81. #else
  82.         if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
  83.                 u16 val;
  84.                 pci_read_config_word(pdev, 0xb0, &val);
  85.                 base = val >> 4 << 20;
  86.         } else {
  87.                 u8 val;
  88.                 pci_read_config_byte(pdev, 0x9c, &val);
  89.                 base = val >> 3 << 27;
  90.         }
  91.         base -= dev_priv->mm.gtt->stolen_size;
  92. #endif
  93.  
  94.         return base + offset;
  95. }
  96.  
  97. static void i915_warn_stolen(struct drm_device *dev)
  98. {
  99.         DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
  100.         DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
  101. }
  102.  
  103. static void i915_setup_compression(struct drm_device *dev, int size)
  104. {
  105.         struct drm_i915_private *dev_priv = dev->dev_private;
  106.         struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
  107.         unsigned long cfb_base;
  108.         unsigned long ll_base = 0;
  109.  
  110.         /* Just in case the BIOS is doing something questionable. */
  111.         intel_disable_fbc(dev);
  112.  
  113.         compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
  114.         if (compressed_fb)
  115.                 compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
  116.         if (!compressed_fb)
  117.                 goto err;
  118.  
  119.         cfb_base = i915_stolen_to_phys(dev, compressed_fb->start);
  120.         if (!cfb_base)
  121.                 goto err_fb;
  122.  
  123.         if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) {
  124.                 compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
  125.                                                     4096, 4096, 0);
  126.                 if (compressed_llb)
  127.                         compressed_llb = drm_mm_get_block(compressed_llb,
  128.                                                           4096, 4096);
  129.                 if (!compressed_llb)
  130.                         goto err_fb;
  131.  
  132.                 ll_base = i915_stolen_to_phys(dev, compressed_llb->start);
  133.                 if (!ll_base)
  134.                         goto err_llb;
  135.         }
  136.  
  137.         dev_priv->cfb_size = size;
  138.  
  139.         dev_priv->compressed_fb = compressed_fb;
  140.         if (HAS_PCH_SPLIT(dev))
  141.                 I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
  142.         else if (IS_GM45(dev)) {
  143.                 I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
  144.         } else {
  145.                 I915_WRITE(FBC_CFB_BASE, cfb_base);
  146.                 I915_WRITE(FBC_LL_BASE, ll_base);
  147.                 dev_priv->compressed_llb = compressed_llb;
  148.         }
  149.  
  150.         DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
  151.                       cfb_base, ll_base, size >> 20);
  152.         return;
  153.  
  154. err_llb:
  155.         drm_mm_put_block(compressed_llb);
  156. err_fb:
  157.         drm_mm_put_block(compressed_fb);
  158. err:
  159.         dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
  160.         i915_warn_stolen(dev);
  161. }
  162.  
  163. static void i915_cleanup_compression(struct drm_device *dev)
  164. {
  165.         struct drm_i915_private *dev_priv = dev->dev_private;
  166.  
  167.         drm_mm_put_block(dev_priv->compressed_fb);
  168.         if (dev_priv->compressed_llb)
  169.                 drm_mm_put_block(dev_priv->compressed_llb);
  170. }
  171.  
  172. void i915_gem_cleanup_stolen(struct drm_device *dev)
  173. {
  174.         if (I915_HAS_FBC(dev) && i915_powersave)
  175.                 i915_cleanup_compression(dev);
  176. }
  177.  
  178. int i915_gem_init_stolen(struct drm_device *dev)
  179. {
  180.         struct drm_i915_private *dev_priv = dev->dev_private;
  181.         unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size;
  182.  
  183.         /* Basic memrange allocator for stolen space */
  184.         drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
  185.  
  186.         /* Try to set up FBC with a reasonable compressed buffer size */
  187.         if (I915_HAS_FBC(dev) && i915_powersave) {
  188.                 int cfb_size;
  189.  
  190.                 /* Leave 1M for line length buffer & misc. */
  191.  
  192.                 /* Try to get a 32M buffer... */
  193.                 if (prealloc_size > (36*1024*1024))
  194.                         cfb_size = 32*1024*1024;
  195.                 else /* fall back to 7/8 of the stolen space */
  196.                         cfb_size = prealloc_size * 7 / 8;
  197.                 i915_setup_compression(dev, cfb_size);
  198.         }
  199.  
  200.         return 0;
  201. }
  202.