xref: /dflybsd-src/sys/dev/drm/i915/i915_sysfs.c (revision 872a09d51adf63b4bdae6adb1d96a53f76e161e2)
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 <drm/drmP.h>
29 #include <linux/device.h>
30 #include <linux/module.h>
31 #include "intel_drv.h"
32 #include "i915_drv.h"
33 
34 #if 0
35 #define dev_to_drm_minor(d) dev_get_drvdata((d))
36 
37 #ifdef CONFIG_PM
38 static u32 calc_residency(struct drm_device *dev,
39 			  i915_reg_t reg)
40 {
41 	struct drm_i915_private *dev_priv = to_i915(dev);
42 	u64 raw_time; /* 32b value may overflow during fixed point math */
43 	u64 units = 128ULL, div = 100000ULL;
44 	u32 ret;
45 
46 	if (!intel_enable_rc6())
47 		return 0;
48 
49 	intel_runtime_pm_get(dev_priv);
50 
51 	/* On VLV and CHV, residency time is in CZ units rather than 1.28us */
52 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
53 		units = 1;
54 		div = dev_priv->czclk_freq;
55 
56 		if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
57 			units <<= 8;
58 	} else if (IS_BROXTON(dev)) {
59 		units = 1;
60 		div = 1200;		/* 833.33ns */
61 	}
62 
63 	raw_time = I915_READ(reg) * units;
64 	ret = DIV_ROUND_UP_ULL(raw_time, div);
65 
66 	intel_runtime_pm_put(dev_priv);
67 	return ret;
68 }
69 
70 static ssize_t
71 show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
72 {
73 	return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6());
74 }
75 
76 static ssize_t
77 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
78 {
79 	struct drm_minor *dminor = dev_get_drvdata(kdev);
80 	u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
81 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
82 }
83 
84 static ssize_t
85 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
86 {
87 	struct drm_minor *dminor = dev_to_drm_minor(kdev);
88 	u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
89 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
90 }
91 
92 static ssize_t
93 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
94 {
95 	struct drm_minor *dminor = dev_to_drm_minor(kdev);
96 	u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
97 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
98 }
99 
100 static ssize_t
101 show_media_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
102 {
103 	struct drm_minor *dminor = dev_get_drvdata(kdev);
104 	u32 rc6_residency = calc_residency(dminor->dev, VLV_GT_MEDIA_RC6);
105 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
106 }
107 
108 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
109 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
110 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
111 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
112 static DEVICE_ATTR(media_rc6_residency_ms, S_IRUGO, show_media_rc6_ms, NULL);
113 
114 static struct attribute *rc6_attrs[] = {
115 	&dev_attr_rc6_enable.attr,
116 	&dev_attr_rc6_residency_ms.attr,
117 	NULL
118 };
119 
120 static struct attribute_group rc6_attr_group = {
121 	.name = power_group_name,
122 	.attrs =  rc6_attrs
123 };
124 
125 static struct attribute *rc6p_attrs[] = {
126 	&dev_attr_rc6p_residency_ms.attr,
127 	&dev_attr_rc6pp_residency_ms.attr,
128 	NULL
129 };
130 
131 static struct attribute_group rc6p_attr_group = {
132 	.name = power_group_name,
133 	.attrs =  rc6p_attrs
134 };
135 
136 static struct attribute *media_rc6_attrs[] = {
137 	&dev_attr_media_rc6_residency_ms.attr,
138 	NULL
139 };
140 
141 static struct attribute_group media_rc6_attr_group = {
142 	.name = power_group_name,
143 	.attrs =  media_rc6_attrs
144 };
145 #endif
146 
147 static int l3_access_valid(struct drm_device *dev, loff_t offset)
148 {
149 	if (!HAS_L3_DPF(dev))
150 		return -EPERM;
151 
152 	if (offset % 4 != 0)
153 		return -EINVAL;
154 
155 	if (offset >= GEN7_L3LOG_SIZE)
156 		return -ENXIO;
157 
158 	return 0;
159 }
160 
161 static ssize_t
162 i915_l3_read(struct file *filp, struct kobject *kobj,
163 	     struct bin_attribute *attr, char *buf,
164 	     loff_t offset, size_t count)
165 {
166 	struct device *dev = kobj_to_dev(kobj);
167 	struct drm_minor *dminor = dev_to_drm_minor(dev);
168 	struct drm_device *drm_dev = dminor->dev;
169 	struct drm_i915_private *dev_priv = to_i915(drm_dev);
170 	int slice = (int)(uintptr_t)attr->private;
171 	int ret;
172 
173 	count = round_down(count, 4);
174 
175 	ret = l3_access_valid(drm_dev, offset);
176 	if (ret)
177 		return ret;
178 
179 	count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
180 
181 	ret = i915_mutex_lock_interruptible(drm_dev);
182 	if (ret)
183 		return ret;
184 
185 	if (dev_priv->l3_parity.remap_info[slice])
186 		memcpy(buf,
187 		       dev_priv->l3_parity.remap_info[slice] + (offset/4),
188 		       count);
189 	else
190 		memset(buf, 0, count);
191 
192 	mutex_unlock(&drm_dev->struct_mutex);
193 
194 	return count;
195 }
196 
197 static ssize_t
198 i915_l3_write(struct file *filp, struct kobject *kobj,
199 	      struct bin_attribute *attr, char *buf,
200 	      loff_t offset, size_t count)
201 {
202 	struct device *dev = kobj_to_dev(kobj);
203 	struct drm_minor *dminor = dev_to_drm_minor(dev);
204 	struct drm_device *drm_dev = dminor->dev;
205 	struct drm_i915_private *dev_priv = to_i915(drm_dev);
206 	struct i915_gem_context *ctx;
207 	u32 *temp = NULL; /* Just here to make handling failures easy */
208 	int slice = (int)(uintptr_t)attr->private;
209 	int ret;
210 
211 	if (!HAS_HW_CONTEXTS(drm_dev))
212 		return -ENXIO;
213 
214 	ret = l3_access_valid(drm_dev, offset);
215 	if (ret)
216 		return ret;
217 
218 	ret = i915_mutex_lock_interruptible(drm_dev);
219 	if (ret)
220 		return ret;
221 
222 	if (!dev_priv->l3_parity.remap_info[slice]) {
223 		temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
224 		if (!temp) {
225 			mutex_unlock(&drm_dev->struct_mutex);
226 			return -ENOMEM;
227 		}
228 	}
229 
230 	/* TODO: Ideally we really want a GPU reset here to make sure errors
231 	 * aren't propagated. Since I cannot find a stable way to reset the GPU
232 	 * at this point it is left as a TODO.
233 	*/
234 	if (temp)
235 		dev_priv->l3_parity.remap_info[slice] = temp;
236 
237 	memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
238 
239 	/* NB: We defer the remapping until we switch to the context */
240 	list_for_each_entry(ctx, &dev_priv->context_list, link)
241 		ctx->remap_slice |= (1<<slice);
242 
243 	mutex_unlock(&drm_dev->struct_mutex);
244 
245 	return count;
246 }
247 
248 static struct bin_attribute dpf_attrs = {
249 	.attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
250 	.size = GEN7_L3LOG_SIZE,
251 	.read = i915_l3_read,
252 	.write = i915_l3_write,
253 	.mmap = NULL,
254 	.private = (void *)0
255 };
256 
257 static struct bin_attribute dpf_attrs_1 = {
258 	.attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)},
259 	.size = GEN7_L3LOG_SIZE,
260 	.read = i915_l3_read,
261 	.write = i915_l3_write,
262 	.mmap = NULL,
263 	.private = (void *)1
264 };
265 
266 static ssize_t gt_act_freq_mhz_show(struct device *kdev,
267 				    struct device_attribute *attr, char *buf)
268 {
269 	struct drm_minor *minor = dev_to_drm_minor(kdev);
270 	struct drm_device *dev = minor->dev;
271 	struct drm_i915_private *dev_priv = to_i915(dev);
272 	int ret;
273 
274 	intel_runtime_pm_get(dev_priv);
275 
276 	mutex_lock(&dev_priv->rps.hw_lock);
277 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
278 		u32 freq;
279 		freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
280 		ret = intel_gpu_freq(dev_priv, (freq >> 8) & 0xff);
281 	} else {
282 		u32 rpstat = I915_READ(GEN6_RPSTAT1);
283 		if (IS_GEN9(dev_priv))
284 			ret = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
285 		else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
286 			ret = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
287 		else
288 			ret = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
289 		ret = intel_gpu_freq(dev_priv, ret);
290 	}
291 	mutex_unlock(&dev_priv->rps.hw_lock);
292 
293 	intel_runtime_pm_put(dev_priv);
294 
295 	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
296 }
297 
298 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
299 				    struct device_attribute *attr, char *buf)
300 {
301 	struct drm_minor *minor = dev_to_drm_minor(kdev);
302 	struct drm_device *dev = minor->dev;
303 	struct drm_i915_private *dev_priv = to_i915(dev);
304 
305 	return snprintf(buf, PAGE_SIZE, "%d\n",
306 			intel_gpu_freq(dev_priv,
307 				       dev_priv->rps.cur_freq));
308 }
309 
310 static ssize_t gt_boost_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
311 {
312 	struct drm_minor *minor = dev_to_drm_minor(kdev);
313 	struct drm_i915_private *dev_priv = to_i915(minor->dev);
314 
315 	return snprintf(buf, PAGE_SIZE, "%d\n",
316 			intel_gpu_freq(dev_priv,
317 				       dev_priv->rps.boost_freq));
318 }
319 
320 static ssize_t gt_boost_freq_mhz_store(struct device *kdev,
321 				       struct device_attribute *attr,
322 				       const char *buf, size_t count)
323 {
324 	struct drm_minor *minor = dev_to_drm_minor(kdev);
325 	struct drm_device *dev = minor->dev;
326 	struct drm_i915_private *dev_priv = to_i915(dev);
327 	u32 val;
328 	ssize_t ret;
329 
330 	ret = kstrtou32(buf, 0, &val);
331 	if (ret)
332 		return ret;
333 
334 	/* Validate against (static) hardware limits */
335 	val = intel_freq_opcode(dev_priv, val);
336 	if (val < dev_priv->rps.min_freq || val > dev_priv->rps.max_freq)
337 		return -EINVAL;
338 
339 	mutex_lock(&dev_priv->rps.hw_lock);
340 	dev_priv->rps.boost_freq = val;
341 	mutex_unlock(&dev_priv->rps.hw_lock);
342 
343 	return count;
344 }
345 
346 static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
347 				     struct device_attribute *attr, char *buf)
348 {
349 	struct drm_minor *minor = dev_to_drm_minor(kdev);
350 	struct drm_device *dev = minor->dev;
351 	struct drm_i915_private *dev_priv = to_i915(dev);
352 
353 	return snprintf(buf, PAGE_SIZE, "%d\n",
354 			intel_gpu_freq(dev_priv,
355 				       dev_priv->rps.efficient_freq));
356 }
357 
358 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
359 {
360 	struct drm_minor *minor = dev_to_drm_minor(kdev);
361 	struct drm_device *dev = minor->dev;
362 	struct drm_i915_private *dev_priv = to_i915(dev);
363 
364 	return snprintf(buf, PAGE_SIZE, "%d\n",
365 			intel_gpu_freq(dev_priv,
366 				       dev_priv->rps.max_freq_softlimit));
367 }
368 
369 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
370 				     struct device_attribute *attr,
371 				     const char *buf, size_t count)
372 {
373 	struct drm_minor *minor = dev_to_drm_minor(kdev);
374 	struct drm_device *dev = minor->dev;
375 	struct drm_i915_private *dev_priv = to_i915(dev);
376 	u32 val;
377 	ssize_t ret;
378 
379 	ret = kstrtou32(buf, 0, &val);
380 	if (ret)
381 		return ret;
382 
383 	intel_runtime_pm_get(dev_priv);
384 
385 	mutex_lock(&dev_priv->rps.hw_lock);
386 
387 	val = intel_freq_opcode(dev_priv, val);
388 
389 	if (val < dev_priv->rps.min_freq ||
390 	    val > dev_priv->rps.max_freq ||
391 	    val < dev_priv->rps.min_freq_softlimit) {
392 		mutex_unlock(&dev_priv->rps.hw_lock);
393 		intel_runtime_pm_put(dev_priv);
394 		return -EINVAL;
395 	}
396 
397 	if (val > dev_priv->rps.rp0_freq)
398 		DRM_DEBUG("User requested overclocking to %d\n",
399 			  intel_gpu_freq(dev_priv, val));
400 
401 	dev_priv->rps.max_freq_softlimit = val;
402 
403 	val = clamp_t(int, dev_priv->rps.cur_freq,
404 		      dev_priv->rps.min_freq_softlimit,
405 		      dev_priv->rps.max_freq_softlimit);
406 
407 	/* We still need *_set_rps to process the new max_delay and
408 	 * update the interrupt limits and PMINTRMSK even though
409 	 * frequency request may be unchanged. */
410 	intel_set_rps(dev_priv, val);
411 
412 	mutex_unlock(&dev_priv->rps.hw_lock);
413 
414 	intel_runtime_pm_put(dev_priv);
415 
416 	return count;
417 }
418 
419 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
420 {
421 	struct drm_minor *minor = dev_to_drm_minor(kdev);
422 	struct drm_device *dev = minor->dev;
423 	struct drm_i915_private *dev_priv = to_i915(dev);
424 
425 	return snprintf(buf, PAGE_SIZE, "%d\n",
426 			intel_gpu_freq(dev_priv,
427 				       dev_priv->rps.min_freq_softlimit));
428 }
429 
430 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
431 				     struct device_attribute *attr,
432 				     const char *buf, size_t count)
433 {
434 	struct drm_minor *minor = dev_to_drm_minor(kdev);
435 	struct drm_device *dev = minor->dev;
436 	struct drm_i915_private *dev_priv = to_i915(dev);
437 	u32 val;
438 	ssize_t ret;
439 
440 	ret = kstrtou32(buf, 0, &val);
441 	if (ret)
442 		return ret;
443 
444 	intel_runtime_pm_get(dev_priv);
445 
446 	mutex_lock(&dev_priv->rps.hw_lock);
447 
448 	val = intel_freq_opcode(dev_priv, val);
449 
450 	if (val < dev_priv->rps.min_freq ||
451 	    val > dev_priv->rps.max_freq ||
452 	    val > dev_priv->rps.max_freq_softlimit) {
453 		mutex_unlock(&dev_priv->rps.hw_lock);
454 		intel_runtime_pm_put(dev_priv);
455 		return -EINVAL;
456 	}
457 
458 	dev_priv->rps.min_freq_softlimit = val;
459 
460 	val = clamp_t(int, dev_priv->rps.cur_freq,
461 		      dev_priv->rps.min_freq_softlimit,
462 		      dev_priv->rps.max_freq_softlimit);
463 
464 	/* We still need *_set_rps to process the new min_delay and
465 	 * update the interrupt limits and PMINTRMSK even though
466 	 * frequency request may be unchanged. */
467 	intel_set_rps(dev_priv, val);
468 
469 	mutex_unlock(&dev_priv->rps.hw_lock);
470 
471 	intel_runtime_pm_put(dev_priv);
472 
473 	return count;
474 
475 }
476 
477 static DEVICE_ATTR(gt_act_freq_mhz, S_IRUGO, gt_act_freq_mhz_show, NULL);
478 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
479 static DEVICE_ATTR(gt_boost_freq_mhz, S_IRUGO, gt_boost_freq_mhz_show, gt_boost_freq_mhz_store);
480 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
481 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
482 
483 static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
484 
485 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
486 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
487 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
488 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
489 
490 /* For now we have a static number of RP states */
491 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
492 {
493 	struct drm_minor *minor = dev_to_drm_minor(kdev);
494 	struct drm_device *dev = minor->dev;
495 	struct drm_i915_private *dev_priv = to_i915(dev);
496 	u32 val;
497 
498 	if (attr == &dev_attr_gt_RP0_freq_mhz)
499 		val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
500 	else if (attr == &dev_attr_gt_RP1_freq_mhz)
501 		val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
502 	else if (attr == &dev_attr_gt_RPn_freq_mhz)
503 		val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
504 	else
505 		BUG();
506 
507 	return snprintf(buf, PAGE_SIZE, "%d\n", val);
508 }
509 
510 static const struct attribute *gen6_attrs[] = {
511 	&dev_attr_gt_act_freq_mhz.attr,
512 	&dev_attr_gt_cur_freq_mhz.attr,
513 	&dev_attr_gt_boost_freq_mhz.attr,
514 	&dev_attr_gt_max_freq_mhz.attr,
515 	&dev_attr_gt_min_freq_mhz.attr,
516 	&dev_attr_gt_RP0_freq_mhz.attr,
517 	&dev_attr_gt_RP1_freq_mhz.attr,
518 	&dev_attr_gt_RPn_freq_mhz.attr,
519 	NULL,
520 };
521 
522 static const struct attribute *vlv_attrs[] = {
523 	&dev_attr_gt_act_freq_mhz.attr,
524 	&dev_attr_gt_cur_freq_mhz.attr,
525 	&dev_attr_gt_boost_freq_mhz.attr,
526 	&dev_attr_gt_max_freq_mhz.attr,
527 	&dev_attr_gt_min_freq_mhz.attr,
528 	&dev_attr_gt_RP0_freq_mhz.attr,
529 	&dev_attr_gt_RP1_freq_mhz.attr,
530 	&dev_attr_gt_RPn_freq_mhz.attr,
531 	&dev_attr_vlv_rpe_freq_mhz.attr,
532 	NULL,
533 };
534 
535 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
536 				struct bin_attribute *attr, char *buf,
537 				loff_t off, size_t count)
538 {
539 
540 	struct device *kdev = kobj_to_dev(kobj);
541 	struct drm_minor *minor = dev_to_drm_minor(kdev);
542 	struct drm_device *dev = minor->dev;
543 	struct i915_error_state_file_priv error_priv;
544 	struct drm_i915_error_state_buf error_str;
545 	ssize_t ret_count = 0;
546 	int ret;
547 
548 	memset(&error_priv, 0, sizeof(error_priv));
549 
550 	ret = i915_error_state_buf_init(&error_str, to_i915(dev), count, off);
551 	if (ret)
552 		return ret;
553 
554 	error_priv.dev = dev;
555 	i915_error_state_get(dev, &error_priv);
556 
557 	ret = i915_error_state_to_str(&error_str, &error_priv);
558 	if (ret)
559 		goto out;
560 
561 	ret_count = count < error_str.bytes ? count : error_str.bytes;
562 
563 	memcpy(buf, error_str.buf, ret_count);
564 out:
565 	i915_error_state_put(&error_priv);
566 	i915_error_state_buf_release(&error_str);
567 
568 	return ret ?: ret_count;
569 }
570 
571 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
572 				 struct bin_attribute *attr, char *buf,
573 				 loff_t off, size_t count)
574 {
575 	struct device *kdev = kobj_to_dev(kobj);
576 	struct drm_minor *minor = dev_to_drm_minor(kdev);
577 	struct drm_device *dev = minor->dev;
578 	int ret;
579 
580 	DRM_DEBUG_DRIVER("Resetting error state\n");
581 
582 	ret = mutex_lock_interruptible(&dev->struct_mutex);
583 	if (ret)
584 		return ret;
585 
586 	i915_destroy_error_state(dev);
587 	mutex_unlock(&dev->struct_mutex);
588 
589 	return count;
590 }
591 
592 static struct bin_attribute error_state_attr = {
593 	.attr.name = "error",
594 	.attr.mode = S_IRUSR | S_IWUSR,
595 	.size = 0,
596 	.read = error_state_read,
597 	.write = error_state_write,
598 };
599 #endif
600 
601 void i915_setup_sysfs(struct drm_device *dev)
602 {
603 #if 0
604 	int ret;
605 
606 #ifdef CONFIG_PM
607 	if (HAS_RC6(dev)) {
608 		ret = sysfs_merge_group(&dev->primary->kdev->kobj,
609 					&rc6_attr_group);
610 		if (ret)
611 			DRM_ERROR("RC6 residency sysfs setup failed\n");
612 	}
613 	if (HAS_RC6p(dev)) {
614 		ret = sysfs_merge_group(&dev->primary->kdev->kobj,
615 					&rc6p_attr_group);
616 		if (ret)
617 			DRM_ERROR("RC6p residency sysfs setup failed\n");
618 	}
619 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
620 		ret = sysfs_merge_group(&dev->primary->kdev->kobj,
621 					&media_rc6_attr_group);
622 		if (ret)
623 			DRM_ERROR("Media RC6 residency sysfs setup failed\n");
624 	}
625 #endif
626 	if (HAS_L3_DPF(dev)) {
627 		ret = device_create_bin_file(dev->primary->kdev, &dpf_attrs);
628 		if (ret)
629 			DRM_ERROR("l3 parity sysfs setup failed\n");
630 
631 		if (NUM_L3_SLICES(dev) > 1) {
632 			ret = device_create_bin_file(dev->primary->kdev,
633 						     &dpf_attrs_1);
634 			if (ret)
635 				DRM_ERROR("l3 parity slice 1 setup failed\n");
636 		}
637 	}
638 
639 	ret = 0;
640 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
641 		ret = sysfs_create_files(&dev->primary->kdev->kobj, vlv_attrs);
642 	else if (INTEL_INFO(dev)->gen >= 6)
643 		ret = sysfs_create_files(&dev->primary->kdev->kobj, gen6_attrs);
644 	if (ret)
645 		DRM_ERROR("RPS sysfs setup failed\n");
646 
647 	ret = sysfs_create_bin_file(&dev->primary->kdev->kobj,
648 				    &error_state_attr);
649 	if (ret)
650 		DRM_ERROR("error_state sysfs setup failed\n");
651 #endif
652 }
653 
654 void i915_teardown_sysfs(struct drm_device *dev)
655 {
656 #if 0
657 	sysfs_remove_bin_file(&dev->primary->kdev->kobj, &error_state_attr);
658 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
659 		sysfs_remove_files(&dev->primary->kdev->kobj, vlv_attrs);
660 	else
661 		sysfs_remove_files(&dev->primary->kdev->kobj, gen6_attrs);
662 	device_remove_bin_file(dev->primary->kdev,  &dpf_attrs_1);
663 	device_remove_bin_file(dev->primary->kdev,  &dpf_attrs);
664 #ifdef CONFIG_PM
665 	sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6_attr_group);
666 	sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6p_attr_group);
667 #endif
668 #endif
669 }
670