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9797fbfb CW |
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 | ||
760285e7 DH |
29 | #include <drm/drmP.h> |
30 | #include <drm/i915_drm.h> | |
9797fbfb CW |
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 | ||
e12a2d53 | 45 | static unsigned long i915_stolen_to_physical(struct drm_device *dev) |
9797fbfb CW |
46 | { |
47 | struct drm_i915_private *dev_priv = dev->dev_private; | |
48 | struct pci_dev *pdev = dev_priv->bridge_dev; | |
49 | u32 base; | |
50 | ||
9797fbfb | 51 | /* On the machines I have tested the Graphics Base of Stolen Memory |
e12a2d53 CW |
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. | |
9797fbfb | 63 | */ |
e12a2d53 CW |
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 */ | |
9797fbfb | 74 | pci_read_config_dword(pdev, 0xA4, &base); |
e12a2d53 CW |
75 | #if 0 |
76 | } else if (IS_GEN3(dev)) { | |
9797fbfb | 77 | u8 val; |
e12a2d53 | 78 | /* Stolen is immediately below Top of Low Usable DRAM */ |
9797fbfb CW |
79 | pci_read_config_byte(pdev, 0x9c, &val); |
80 | base = val >> 3 << 27; | |
e12a2d53 CW |
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; | |
9797fbfb | 85 | #endif |
e12a2d53 | 86 | } |
9797fbfb | 87 | |
e12a2d53 | 88 | return base; |
9797fbfb CW |
89 | } |
90 | ||
11be49eb | 91 | static int i915_setup_compression(struct drm_device *dev, int size) |
9797fbfb CW |
92 | { |
93 | struct drm_i915_private *dev_priv = dev->dev_private; | |
94 | struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb); | |
9797fbfb | 95 | |
11be49eb CW |
96 | /* Try to over-allocate to reduce reallocations and fragmentation */ |
97 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
98 | size <<= 1, 4096, 0); | |
99 | if (!compressed_fb) | |
100 | compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, | |
101 | size >>= 1, 4096, 0); | |
9797fbfb CW |
102 | if (compressed_fb) |
103 | compressed_fb = drm_mm_get_block(compressed_fb, size, 4096); | |
104 | if (!compressed_fb) | |
105 | goto err; | |
106 | ||
11be49eb CW |
107 | if (HAS_PCH_SPLIT(dev)) |
108 | I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start); | |
109 | else if (IS_GM45(dev)) { | |
110 | I915_WRITE(DPFC_CB_BASE, compressed_fb->start); | |
111 | } else { | |
9797fbfb CW |
112 | compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen, |
113 | 4096, 4096, 0); | |
114 | if (compressed_llb) | |
115 | compressed_llb = drm_mm_get_block(compressed_llb, | |
116 | 4096, 4096); | |
117 | if (!compressed_llb) | |
118 | goto err_fb; | |
119 | ||
11be49eb CW |
120 | dev_priv->compressed_llb = compressed_llb; |
121 | ||
122 | I915_WRITE(FBC_CFB_BASE, | |
123 | dev_priv->mm.stolen_base + compressed_fb->start); | |
124 | I915_WRITE(FBC_LL_BASE, | |
125 | dev_priv->mm.stolen_base + compressed_llb->start); | |
9797fbfb CW |
126 | } |
127 | ||
11be49eb | 128 | dev_priv->compressed_fb = compressed_fb; |
9797fbfb CW |
129 | dev_priv->cfb_size = size; |
130 | ||
11be49eb CW |
131 | DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n", |
132 | size); | |
9797fbfb | 133 | |
11be49eb | 134 | return 0; |
9797fbfb | 135 | |
9797fbfb CW |
136 | err_fb: |
137 | drm_mm_put_block(compressed_fb); | |
138 | err: | |
11be49eb CW |
139 | return -ENOSPC; |
140 | } | |
141 | ||
142 | int i915_gem_stolen_setup_compression(struct drm_device *dev, int size) | |
143 | { | |
144 | struct drm_i915_private *dev_priv = dev->dev_private; | |
145 | ||
146 | if (dev_priv->mm.stolen_base == 0) | |
147 | return -ENODEV; | |
148 | ||
149 | if (size < dev_priv->cfb_size) | |
150 | return 0; | |
151 | ||
152 | /* Release any current block */ | |
153 | i915_gem_stolen_cleanup_compression(dev); | |
154 | ||
155 | return i915_setup_compression(dev, size); | |
9797fbfb CW |
156 | } |
157 | ||
11be49eb | 158 | void i915_gem_stolen_cleanup_compression(struct drm_device *dev) |
9797fbfb CW |
159 | { |
160 | struct drm_i915_private *dev_priv = dev->dev_private; | |
161 | ||
11be49eb CW |
162 | if (dev_priv->cfb_size == 0) |
163 | return; | |
164 | ||
165 | if (dev_priv->compressed_fb) | |
166 | drm_mm_put_block(dev_priv->compressed_fb); | |
167 | ||
9797fbfb CW |
168 | if (dev_priv->compressed_llb) |
169 | drm_mm_put_block(dev_priv->compressed_llb); | |
11be49eb CW |
170 | |
171 | dev_priv->cfb_size = 0; | |
9797fbfb CW |
172 | } |
173 | ||
174 | void i915_gem_cleanup_stolen(struct drm_device *dev) | |
175 | { | |
11be49eb | 176 | i915_gem_stolen_cleanup_compression(dev); |
9797fbfb CW |
177 | } |
178 | ||
179 | int i915_gem_init_stolen(struct drm_device *dev) | |
180 | { | |
181 | struct drm_i915_private *dev_priv = dev->dev_private; | |
9797fbfb | 182 | |
e12a2d53 CW |
183 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
184 | if (dev_priv->mm.stolen_base == 0) | |
185 | return 0; | |
186 | ||
187 | DRM_DEBUG_KMS("found %d bytes of stolen memory at %08lx\n", | |
188 | dev_priv->mm.gtt->stolen_size, dev_priv->mm.stolen_base); | |
189 | ||
9797fbfb | 190 | /* Basic memrange allocator for stolen space */ |
11be49eb | 191 | drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->mm.gtt->stolen_size); |
9797fbfb CW |
192 | |
193 | return 0; | |
194 | } |