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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 | ||
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 | ||
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 | } |