Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 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 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 29 | #include <drm/drmP.h> |
| 30 | #include <drm/i915_drm.h> |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 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 | |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 45 | static unsigned long i915_stolen_to_physical(struct drm_device *dev) |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 46 | { |
| 47 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 48 | struct pci_dev *pdev = dev_priv->bridge_dev; |
| 49 | u32 base; |
| 50 | |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 51 | /* On the machines I have tested the Graphics Base of Stolen Memory |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 52 | * is unreliable, so on those compute the base by subtracting the |
| 53 | * stolen memory from the Top of Low Usable DRAM which is where the |
| 54 | * BIOS places the graphics stolen memory. |
| 55 | * |
| 56 | * On gen2, the layout is slightly different with the Graphics Segment |
| 57 | * immediately following Top of Memory (or Top of Usable DRAM). Note |
| 58 | * it appears that TOUD is only reported by 865g, so we just use the |
| 59 | * top of memory as determined by the e820 probe. |
| 60 | * |
| 61 | * XXX gen2 requires an unavailable symbol and 945gm fails with |
| 62 | * its value of TOLUD. |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 63 | */ |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 64 | base = 0; |
| 65 | if (INTEL_INFO(dev)->gen >= 6) { |
| 66 | /* Read Base Data of Stolen Memory Register (BDSM) directly. |
| 67 | * Note that there is also a MCHBAR miror at 0x1080c0 or |
| 68 | * we could use device 2:0x5c instead. |
| 69 | */ |
| 70 | pci_read_config_dword(pdev, 0xB0, &base); |
| 71 | base &= ~4095; /* lower bits used for locking register */ |
| 72 | } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) { |
| 73 | /* Read Graphics Base of Stolen Memory directly */ |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 74 | pci_read_config_dword(pdev, 0xA4, &base); |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 75 | #if 0 |
| 76 | } else if (IS_GEN3(dev)) { |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 77 | u8 val; |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 78 | /* Stolen is immediately below Top of Low Usable DRAM */ |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 79 | pci_read_config_byte(pdev, 0x9c, &val); |
| 80 | base = val >> 3 << 27; |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 81 | base -= dev_priv->mm.gtt->stolen_size; |
| 82 | } else { |
| 83 | /* Stolen is immediately above Top of Memory */ |
| 84 | base = max_low_pfn_mapped << PAGE_SHIFT; |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 85 | #endif |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 86 | } |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 87 | |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 88 | return base; |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | static void i915_warn_stolen(struct drm_device *dev) |
| 92 | { |
| 93 | DRM_INFO("not enough stolen space for compressed buffer, disabling\n"); |
| 94 | DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n"); |
| 95 | } |
| 96 | |
| 97 | static void 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, *uninitialized_var(compressed_llb); |
| 101 | unsigned long cfb_base; |
| 102 | unsigned long ll_base = 0; |
| 103 | |
| 104 | /* Just in case the BIOS is doing something questionable. */ |
| 105 | intel_disable_fbc(dev); |
| 106 | |
| 107 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 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 | |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 113 | cfb_base = dev_priv->mm.stolen_base + compressed_fb->start; |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 114 | if (!cfb_base) |
| 115 | goto err_fb; |
| 116 | |
| 117 | if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) { |
| 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 | |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 126 | ll_base = dev_priv->mm.stolen_base + compressed_llb->start; |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 127 | if (!ll_base) |
| 128 | goto err_llb; |
| 129 | } |
| 130 | |
| 131 | dev_priv->cfb_size = size; |
| 132 | |
| 133 | dev_priv->compressed_fb = compressed_fb; |
| 134 | if (HAS_PCH_SPLIT(dev)) |
| 135 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); |
| 136 | else if (IS_GM45(dev)) { |
| 137 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); |
| 138 | } else { |
| 139 | I915_WRITE(FBC_CFB_BASE, cfb_base); |
| 140 | I915_WRITE(FBC_LL_BASE, ll_base); |
| 141 | dev_priv->compressed_llb = compressed_llb; |
| 142 | } |
| 143 | |
| 144 | DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n", |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 145 | (long)cfb_base, (long)ll_base, size >> 20); |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 146 | return; |
| 147 | |
| 148 | err_llb: |
| 149 | drm_mm_put_block(compressed_llb); |
| 150 | err_fb: |
| 151 | drm_mm_put_block(compressed_fb); |
| 152 | err: |
| 153 | dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL; |
| 154 | i915_warn_stolen(dev); |
| 155 | } |
| 156 | |
| 157 | static void i915_cleanup_compression(struct drm_device *dev) |
| 158 | { |
| 159 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 160 | |
| 161 | drm_mm_put_block(dev_priv->compressed_fb); |
| 162 | if (dev_priv->compressed_llb) |
| 163 | drm_mm_put_block(dev_priv->compressed_llb); |
| 164 | } |
| 165 | |
| 166 | void i915_gem_cleanup_stolen(struct drm_device *dev) |
| 167 | { |
| 168 | if (I915_HAS_FBC(dev) && i915_powersave) |
| 169 | i915_cleanup_compression(dev); |
| 170 | } |
| 171 | |
| 172 | int i915_gem_init_stolen(struct drm_device *dev) |
| 173 | { |
| 174 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 175 | unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size; |
| 176 | |
Chris Wilson | e12a2d5 | 2012-11-15 11:32:18 +0000 | [diff] [blame] | 177 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
| 178 | if (dev_priv->mm.stolen_base == 0) |
| 179 | return 0; |
| 180 | |
| 181 | DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n", |
| 182 | dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base); |
| 183 | |
Chris Wilson | 9797fbf | 2012-04-24 15:47:39 +0100 | [diff] [blame] | 184 | /* Basic memrange allocator for stolen space */ |
| 185 | drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size); |
| 186 | |
| 187 | /* Try to set up FBC with a reasonable compressed buffer size */ |
| 188 | if (I915_HAS_FBC(dev) && i915_powersave) { |
| 189 | int cfb_size; |
| 190 | |
| 191 | /* Leave 1M for line length buffer & misc. */ |
| 192 | |
| 193 | /* Try to get a 32M buffer... */ |
| 194 | if (prealloc_size > (36*1024*1024)) |
| 195 | cfb_size = 32*1024*1024; |
| 196 | else /* fall back to 7/8 of the stolen space */ |
| 197 | cfb_size = prealloc_size * 7 / 8; |
| 198 | i915_setup_compression(dev, cfb_size); |
| 199 | } |
| 200 | |
| 201 | return 0; |
| 202 | } |