tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
62static 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
97static 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
103static 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
154err_llb:
155 drm_mm_put_block(compressed_llb);
156err_fb:
157 drm_mm_put_block(compressed_fb);
158err:
159 dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
160 i915_warn_stolen(dev);
161}
162
163static 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
172void i915_gem_cleanup_stolen(struct drm_device *dev)
173{
174 if (I915_HAS_FBC(dev) && i915_powersave)
175 i915_cleanup_compression(dev);
176}
177
178int 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}