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1 | /* |
2 | * Copyright © 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 | * Ben Widawsky <ben@bwidawsk.net> | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/device.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/sysfs.h> | |
84bc7581 | 32 | #include "intel_drv.h" |
0136db58 BW |
33 | #include "i915_drv.h" |
34 | ||
35 | static u32 calc_residency(struct drm_device *dev, const u32 reg) | |
36 | { | |
37 | struct drm_i915_private *dev_priv = dev->dev_private; | |
38 | u64 raw_time; /* 32b value may overflow during fixed point math */ | |
39 | ||
40 | if (!intel_enable_rc6(dev)) | |
41 | return 0; | |
42 | ||
a85d4bcb BW |
43 | raw_time = I915_READ(reg) * 128ULL; |
44 | return DIV_ROUND_UP_ULL(raw_time, 100000); | |
0136db58 BW |
45 | } |
46 | ||
47 | static ssize_t | |
48 | show_rc6_mask(struct device *dev, struct device_attribute *attr, char *buf) | |
49 | { | |
50 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
51 | return snprintf(buf, PAGE_SIZE, "%x", intel_enable_rc6(dminor->dev)); | |
52 | } | |
53 | ||
54 | static ssize_t | |
55 | show_rc6_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
56 | { | |
57 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
58 | u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6); | |
59 | return snprintf(buf, PAGE_SIZE, "%u", rc6_residency); | |
60 | } | |
61 | ||
62 | static ssize_t | |
63 | show_rc6p_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
64 | { | |
65 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
66 | u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p); | |
67 | return snprintf(buf, PAGE_SIZE, "%u", rc6p_residency); | |
68 | } | |
69 | ||
70 | static ssize_t | |
71 | show_rc6pp_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
72 | { | |
73 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
74 | u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp); | |
75 | return snprintf(buf, PAGE_SIZE, "%u", rc6pp_residency); | |
76 | } | |
77 | ||
78 | static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL); | |
79 | static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL); | |
80 | static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL); | |
81 | static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL); | |
82 | ||
83 | static struct attribute *rc6_attrs[] = { | |
84 | &dev_attr_rc6_enable.attr, | |
85 | &dev_attr_rc6_residency_ms.attr, | |
86 | &dev_attr_rc6p_residency_ms.attr, | |
87 | &dev_attr_rc6pp_residency_ms.attr, | |
88 | NULL | |
89 | }; | |
90 | ||
91 | static struct attribute_group rc6_attr_group = { | |
92 | .name = power_group_name, | |
93 | .attrs = rc6_attrs | |
94 | }; | |
95 | ||
84bc7581 BW |
96 | static int l3_access_valid(struct drm_device *dev, loff_t offset) |
97 | { | |
98 | if (!IS_IVYBRIDGE(dev)) | |
99 | return -EPERM; | |
100 | ||
101 | if (offset % 4 != 0) | |
102 | return -EINVAL; | |
103 | ||
104 | if (offset >= GEN7_L3LOG_SIZE) | |
105 | return -ENXIO; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static ssize_t | |
111 | i915_l3_read(struct file *filp, struct kobject *kobj, | |
112 | struct bin_attribute *attr, char *buf, | |
113 | loff_t offset, size_t count) | |
114 | { | |
115 | struct device *dev = container_of(kobj, struct device, kobj); | |
116 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
117 | struct drm_device *drm_dev = dminor->dev; | |
118 | struct drm_i915_private *dev_priv = drm_dev->dev_private; | |
119 | uint32_t misccpctl; | |
120 | int i, ret; | |
121 | ||
122 | ret = l3_access_valid(drm_dev, offset); | |
123 | if (ret) | |
124 | return ret; | |
125 | ||
126 | ret = i915_mutex_lock_interruptible(drm_dev); | |
127 | if (ret) | |
128 | return ret; | |
129 | ||
130 | misccpctl = I915_READ(GEN7_MISCCPCTL); | |
131 | I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE); | |
132 | ||
133 | for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4) | |
134 | *((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i); | |
135 | ||
136 | I915_WRITE(GEN7_MISCCPCTL, misccpctl); | |
137 | ||
138 | mutex_unlock(&drm_dev->struct_mutex); | |
139 | ||
140 | return i - offset; | |
141 | } | |
142 | ||
143 | static ssize_t | |
144 | i915_l3_write(struct file *filp, struct kobject *kobj, | |
145 | struct bin_attribute *attr, char *buf, | |
146 | loff_t offset, size_t count) | |
147 | { | |
148 | struct device *dev = container_of(kobj, struct device, kobj); | |
149 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
150 | struct drm_device *drm_dev = dminor->dev; | |
151 | struct drm_i915_private *dev_priv = drm_dev->dev_private; | |
152 | u32 *temp = NULL; /* Just here to make handling failures easy */ | |
153 | int ret; | |
154 | ||
155 | ret = l3_access_valid(drm_dev, offset); | |
156 | if (ret) | |
157 | return ret; | |
158 | ||
159 | ret = i915_mutex_lock_interruptible(drm_dev); | |
160 | if (ret) | |
161 | return ret; | |
162 | ||
163 | if (!dev_priv->mm.l3_remap_info) { | |
164 | temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL); | |
165 | if (!temp) { | |
166 | mutex_unlock(&drm_dev->struct_mutex); | |
167 | return -ENOMEM; | |
168 | } | |
169 | } | |
170 | ||
171 | ret = i915_gpu_idle(drm_dev); | |
172 | if (ret) { | |
173 | kfree(temp); | |
174 | mutex_unlock(&drm_dev->struct_mutex); | |
175 | return ret; | |
176 | } | |
177 | ||
178 | /* TODO: Ideally we really want a GPU reset here to make sure errors | |
179 | * aren't propagated. Since I cannot find a stable way to reset the GPU | |
180 | * at this point it is left as a TODO. | |
181 | */ | |
182 | if (temp) | |
183 | dev_priv->mm.l3_remap_info = temp; | |
184 | ||
185 | memcpy(dev_priv->mm.l3_remap_info + (offset/4), | |
186 | buf + (offset/4), | |
187 | count); | |
188 | ||
189 | i915_gem_l3_remap(drm_dev); | |
190 | ||
191 | mutex_unlock(&drm_dev->struct_mutex); | |
192 | ||
193 | return count; | |
194 | } | |
195 | ||
196 | static struct bin_attribute dpf_attrs = { | |
197 | .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)}, | |
198 | .size = GEN7_L3LOG_SIZE, | |
199 | .read = i915_l3_read, | |
200 | .write = i915_l3_write, | |
201 | .mmap = NULL | |
202 | }; | |
203 | ||
0136db58 BW |
204 | void i915_setup_sysfs(struct drm_device *dev) |
205 | { | |
206 | int ret; | |
207 | ||
112abd29 DV |
208 | if (INTEL_INFO(dev)->gen >= 6) { |
209 | ret = sysfs_merge_group(&dev->primary->kdev.kobj, | |
210 | &rc6_attr_group); | |
211 | if (ret) | |
212 | DRM_ERROR("RC6 residency sysfs setup failed\n"); | |
213 | } | |
84bc7581 | 214 | |
112abd29 DV |
215 | if (IS_IVYBRIDGE(dev)) { |
216 | ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs); | |
217 | if (ret) | |
218 | DRM_ERROR("l3 parity sysfs setup failed\n"); | |
219 | } | |
0136db58 BW |
220 | } |
221 | ||
222 | void i915_teardown_sysfs(struct drm_device *dev) | |
223 | { | |
84bc7581 | 224 | device_remove_bin_file(&dev->primary->kdev, &dpf_attrs); |
0136db58 BW |
225 | sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group); |
226 | } |