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 | |
| 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 | } |