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 <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/10/sys/dev/drm2/i915/i915_gem_stolen.c 280369 2015-03-23 13:38:33Z kib $");
31
32 #include <dev/drm2/drmP.h>
33 #include <dev/drm2/drm.h>
34 #include <dev/drm2/i915/i915_drm.h>
35 #include <dev/drm2/i915/i915_drv.h>
36
37 /*
38 * The BIOS typically reserves some of the system's memory for the exclusive
39 * use of the integrated graphics. This memory is no longer available for
40 * use by the OS and so the user finds that his system has less memory
41 * available than he put in. We refer to this memory as stolen.
42 *
43 * The BIOS will allocate its framebuffer from the stolen memory. Our
44 * goal is try to reuse that object for our own fbcon which must always
45 * be available for panics. Anything else we can reuse the stolen memory
46 * for is a boon.
47 */
48
49 #define PTE_ADDRESS_MASK 0xfffff000
50 #define PTE_ADDRESS_MASK_HIGH 0x000000f0 /* i915+ */
51 #define PTE_MAPPING_TYPE_UNCACHED (0 << 1)
52 #define PTE_MAPPING_TYPE_DCACHE (1 << 1) /* i830 only */
53 #define PTE_MAPPING_TYPE_CACHED (3 << 1)
54 #define PTE_MAPPING_TYPE_MASK (3 << 1)
55 #define PTE_VALID (1 << 0)
56
57 /**
58 * i915_stolen_to_phys - take an offset into stolen memory and turn it into
59 * a physical one
60 * @dev: drm device
61 * @offset: address to translate
62 *
63 * Some chip functions require allocations from stolen space and need the
64 * physical address of the memory in question.
65 */
i915_stolen_to_phys(struct drm_device * dev,u32 offset)66 static unsigned long i915_stolen_to_phys(struct drm_device *dev, u32 offset)
67 {
68 struct drm_i915_private *dev_priv = dev->dev_private;
69 device_t pdev = dev_priv->bridge_dev;
70 u32 base;
71
72 #if 0
73 /* On the machines I have tested the Graphics Base of Stolen Memory
74 * is unreliable, so compute the base by subtracting the stolen memory
75 * from the Top of Low Usable DRAM which is where the BIOS places
76 * the graphics stolen memory.
77 */
78 if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
79 /* top 32bits are reserved = 0 */
80 pci_read_config_dword(pdev, 0xA4, &base);
81 } else {
82 /* XXX presume 8xx is the same as i915 */
83 pci_bus_read_config_dword(pdev->bus, 2, 0x5C, &base);
84 }
85 #else
86 if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
87 u16 val;
88 val = pci_read_config(pdev, 0xb0, 2);
89 base = val >> 4 << 20;
90 } else {
91 u8 val;
92 val = pci_read_config(pdev, 0x9c, 1);
93 base = val >> 3 << 27;
94 }
95 base -= dev_priv->mm.gtt.stolen_size;
96 #endif
97
98 return base + offset;
99 }
100
i915_warn_stolen(struct drm_device * dev)101 static void i915_warn_stolen(struct drm_device *dev)
102 {
103 DRM_INFO("not enough stolen space for compressed buffer, disabling\n");
104 DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
105 }
106
i915_setup_compression(struct drm_device * dev,int size)107 static void i915_setup_compression(struct drm_device *dev, int size)
108 {
109 struct drm_i915_private *dev_priv = dev->dev_private;
110 struct drm_mm_node *compressed_fb, *compressed_llb;
111 unsigned long cfb_base;
112 unsigned long ll_base = 0;
113
114 /* Just in case the BIOS is doing something questionable. */
115 intel_disable_fbc(dev);
116
117 compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
118 if (compressed_fb)
119 compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
120 if (!compressed_fb)
121 goto err;
122
123 cfb_base = i915_stolen_to_phys(dev, compressed_fb->start);
124 if (!cfb_base)
125 goto err_fb;
126
127 if (!(IS_GM45(dev) || HAS_PCH_SPLIT(dev))) {
128 compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
129 4096, 4096, 0);
130 if (compressed_llb)
131 compressed_llb = drm_mm_get_block(compressed_llb,
132 4096, 4096);
133 if (!compressed_llb)
134 goto err_fb;
135
136 ll_base = i915_stolen_to_phys(dev, compressed_llb->start);
137 if (!ll_base)
138 goto err_llb;
139 }
140
141 dev_priv->cfb_size = size;
142
143 dev_priv->compressed_fb = compressed_fb;
144 if (HAS_PCH_SPLIT(dev))
145 I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
146 else if (IS_GM45(dev)) {
147 I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
148 } else {
149 I915_WRITE(FBC_CFB_BASE, cfb_base);
150 I915_WRITE(FBC_LL_BASE, ll_base);
151 dev_priv->compressed_llb = compressed_llb;
152 }
153
154 DRM_DEBUG_KMS("FBC base 0x%08lx, ll base 0x%08lx, size %dM\n",
155 cfb_base, ll_base, size >> 20);
156 return;
157
158 err_llb:
159 drm_mm_put_block(compressed_llb);
160 err_fb:
161 drm_mm_put_block(compressed_fb);
162 err:
163 dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
164 i915_warn_stolen(dev);
165 }
166
i915_cleanup_compression(struct drm_device * dev)167 static void i915_cleanup_compression(struct drm_device *dev)
168 {
169 struct drm_i915_private *dev_priv = dev->dev_private;
170
171 drm_mm_put_block(dev_priv->compressed_fb);
172 if (dev_priv->compressed_llb)
173 drm_mm_put_block(dev_priv->compressed_llb);
174 }
175
i915_gem_cleanup_stolen(struct drm_device * dev)176 void i915_gem_cleanup_stolen(struct drm_device *dev)
177 {
178 if (I915_HAS_FBC(dev) && i915_powersave)
179 i915_cleanup_compression(dev);
180 }
181
i915_gem_init_stolen(struct drm_device * dev)182 int i915_gem_init_stolen(struct drm_device *dev)
183 {
184 struct drm_i915_private *dev_priv = dev->dev_private;
185 unsigned long prealloc_size = dev_priv->mm.gtt.stolen_size;
186
187 /* Basic memrange allocator for stolen space */
188 drm_mm_init(&dev_priv->mm.stolen, 0, prealloc_size);
189
190 /* Try to set up FBC with a reasonable compressed buffer size */
191 if (I915_HAS_FBC(dev) && i915_powersave) {
192 int cfb_size;
193
194 /* Leave 1M for line length buffer & misc. */
195
196 /* Try to get a 32M buffer... */
197 if (prealloc_size > (36*1024*1024))
198 cfb_size = 32*1024*1024;
199 else /* fall back to 7/8 of the stolen space */
200 cfb_size = prealloc_size * 7 / 8;
201 i915_setup_compression(dev, cfb_size);
202 }
203
204 return 0;
205 }
206