drivers/gpu/drm/i915/i915_sysfs.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright © 2012 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  *
  * Authors:
  *    Ben Widawsky <ben@bwidawsk.net>
  *
  */

 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/stat.h>
 #include <linux/sysfs.h>
 #include "intel_drv.h"
 #include "i915_drv.h"

 #ifdef CONFIG_PM
 static u32 calc_residency(struct drm_device *dev, const u32 reg)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u64 raw_time; /* 32b value may overflow during fixed point math */

 	if (!intel_enable_rc6(dev))
 		return 0;

 	raw_time = I915_READ(reg) * 128ULL;
 	return DIV_ROUND_UP_ULL(raw_time, 100000);
 }

 static ssize_t
 show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
 	return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6(dminor->dev));
 }

 static ssize_t
 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
 	u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
 }

 static ssize_t
 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
 	u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
 }

 static ssize_t
 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
 	u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
 	return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
 }

 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);

 static struct attribute *rc6_attrs[] = {
 	&dev_attr_rc6_enable.attr,
 	&dev_attr_rc6_residency_ms.attr,
 	&dev_attr_rc6p_residency_ms.attr,
 	&dev_attr_rc6pp_residency_ms.attr,
 	NULL
 };

 static struct attribute_group rc6_attr_group = {
 	.name = power_group_name,
 	.attrs =  rc6_attrs
 };
 #endif

 static int l3_access_valid(struct drm_device *dev, loff_t offset)
 {
 	if (!HAS_L3_GPU_CACHE(dev))
 		return -EPERM;

 	if (offset % 4 != 0)
 		return -EINVAL;

 	if (offset >= GEN7_L3LOG_SIZE)
 		return -ENXIO;

 	return 0;
 }

 static ssize_t
 i915_l3_read(struct file *filp, struct kobject *kobj,
 	     struct bin_attribute *attr, char *buf,
 	     loff_t offset, size_t count)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 	struct drm_device *drm_dev = dminor->dev;
 	struct drm_i915_private *dev_priv = drm_dev->dev_private;
 	uint32_t misccpctl;
 	int i, ret;

 	ret = l3_access_valid(drm_dev, offset);
 	if (ret)
 		return ret;

 	ret = i915_mutex_lock_interruptible(drm_dev);
 	if (ret)
 		return ret;

 	misccpctl = I915_READ(GEN7_MISCCPCTL);
 	I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);

 	for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
 		*((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);

 	I915_WRITE(GEN7_MISCCPCTL, misccpctl);

 	mutex_unlock(&drm_dev->struct_mutex);

 	return i - offset;
 }

 static ssize_t
 i915_l3_write(struct file *filp, struct kobject *kobj,
 	      struct bin_attribute *attr, char *buf,
 	      loff_t offset, size_t count)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 	struct drm_device *drm_dev = dminor->dev;
 	struct drm_i915_private *dev_priv = drm_dev->dev_private;
 	u32 *temp = NULL; /* Just here to make handling failures easy */
 	int ret;

 	ret = l3_access_valid(drm_dev, offset);
 	if (ret)
 		return ret;

 	ret = i915_mutex_lock_interruptible(drm_dev);
 	if (ret)
 		return ret;

 	if (!dev_priv->l3_parity.remap_info) {
 		temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 		if (!temp) {
 			mutex_unlock(&drm_dev->struct_mutex);
 			return -ENOMEM;
 		}
 	}

 	ret = i915_gpu_idle(drm_dev);
 	if (ret) {
 		kfree(temp);
 		mutex_unlock(&drm_dev->struct_mutex);
 		return ret;
 	}

 	/* TODO: Ideally we really want a GPU reset here to make sure errors
 	 * aren't propagated. Since I cannot find a stable way to reset the GPU
 	 * at this point it is left as a TODO.
 	*/
 	if (temp)
 		dev_priv->l3_parity.remap_info = temp;

 	memcpy(dev_priv->l3_parity.remap_info + (offset/4),
 	       buf + (offset/4),
 	       count);

 	i915_gem_l3_remap(drm_dev);

 	mutex_unlock(&drm_dev->struct_mutex);

 	return count;
 }

 static struct bin_attribute dpf_attrs = {
 	.attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 	.size = GEN7_L3LOG_SIZE,
 	.read = i915_l3_read,
 	.write = i915_l3_write,
 	.mmap = NULL
 };

 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 				    struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;

 	mutex_lock(&dev_priv->rps.hw_lock);
 	ret = dev_priv->rps.cur_delay * GT_FREQUENCY_MULTIPLIER;
 	mutex_unlock(&dev_priv->rps.hw_lock);

 	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 }

 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;

 	mutex_lock(&dev_priv->rps.hw_lock);
 	ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
 	mutex_unlock(&dev_priv->rps.hw_lock);

 	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 }

 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 				     struct device_attribute *attr,
 				     const char *buf, size_t count)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val, rp_state_cap, hw_max, hw_min, non_oc_max;
 	ssize_t ret;

 	ret = kstrtou32(buf, 0, &val);
 	if (ret)
 		return ret;

 	val /= GT_FREQUENCY_MULTIPLIER;

 	mutex_lock(&dev_priv->rps.hw_lock);

 	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 	hw_max = dev_priv->rps.hw_max;
 	non_oc_max = (rp_state_cap & 0xff);
 	hw_min = ((rp_state_cap & 0xff0000) >> 16);

 	if (val < hw_min || val > hw_max || val < dev_priv->rps.min_delay) {
 		mutex_unlock(&dev_priv->rps.hw_lock);
 		return -EINVAL;
 	}

 	if (val > non_oc_max)
 		DRM_DEBUG("User requested overclocking to %d\n",
 			  val * GT_FREQUENCY_MULTIPLIER);

 	if (dev_priv->rps.cur_delay > val)
 		gen6_set_rps(dev_priv->dev, val);

 	dev_priv->rps.max_delay = val;

 	mutex_unlock(&dev_priv->rps.hw_lock);

 	return count;
 }

 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;

 	mutex_lock(&dev_priv->rps.hw_lock);
 	ret = dev_priv->rps.min_delay * GT_FREQUENCY_MULTIPLIER;
 	mutex_unlock(&dev_priv->rps.hw_lock);

 	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 }

 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 				     struct device_attribute *attr,
 				     const char *buf, size_t count)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val, rp_state_cap, hw_max, hw_min;
 	ssize_t ret;

 	ret = kstrtou32(buf, 0, &val);
 	if (ret)
 		return ret;

 	val /= GT_FREQUENCY_MULTIPLIER;

 	mutex_lock(&dev_priv->rps.hw_lock);

 	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 	hw_max = dev_priv->rps.hw_max;
 	hw_min = ((rp_state_cap & 0xff0000) >> 16);

 	if (val < hw_min || val > hw_max || val > dev_priv->rps.max_delay) {
 		mutex_unlock(&dev_priv->rps.hw_lock);
 		return -EINVAL;
 	}

 	if (dev_priv->rps.cur_delay < val)
 		gen6_set_rps(dev_priv->dev, val);

 	dev_priv->rps.min_delay = val;

 	mutex_unlock(&dev_priv->rps.hw_lock);

 	return count;

 }

 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);


 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);

 /* For now we have a static number of RP states */
 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 {
 	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 	struct drm_device *dev = minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val, rp_state_cap;
 	ssize_t ret;

 	ret = mutex_lock_interruptible(&dev->struct_mutex);
 	if (ret)
 		return ret;
 	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 	mutex_unlock(&dev->struct_mutex);

 	if (attr == &dev_attr_gt_RP0_freq_mhz) {
 		val = ((rp_state_cap & 0x0000ff) >> 0) * GT_FREQUENCY_MULTIPLIER;
 	} else if (attr == &dev_attr_gt_RP1_freq_mhz) {
 		val = ((rp_state_cap & 0x00ff00) >> 8) * GT_FREQUENCY_MULTIPLIER;
 	} else if (attr == &dev_attr_gt_RPn_freq_mhz) {
 		val = ((rp_state_cap & 0xff0000) >> 16) * GT_FREQUENCY_MULTIPLIER;
 	} else {
 		BUG();
 	}
 	return snprintf(buf, PAGE_SIZE, "%d\n", val);
 }

 static const struct attribute *gen6_attrs[] = {
 	&dev_attr_gt_cur_freq_mhz.attr,
 	&dev_attr_gt_max_freq_mhz.attr,
 	&dev_attr_gt_min_freq_mhz.attr,
 	&dev_attr_gt_RP0_freq_mhz.attr,
 	&dev_attr_gt_RP1_freq_mhz.attr,
 	&dev_attr_gt_RPn_freq_mhz.attr,
 	NULL,
 };

 void i915_setup_sysfs(struct drm_device *dev)
 {
 	int ret;

 #ifdef CONFIG_PM
 	if (INTEL_INFO(dev)->gen >= 6) {
 		ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 					&rc6_attr_group);
 		if (ret)
 			DRM_ERROR("RC6 residency sysfs setup failed\n");
 	}
 #endif
 	if (HAS_L3_GPU_CACHE(dev)) {
 		ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 		if (ret)
 			DRM_ERROR("l3 parity sysfs setup failed\n");
 	}

 	if (INTEL_INFO(dev)->gen >= 6) {
 		ret = sysfs_create_files(&dev->primary->kdev.kobj, gen6_attrs);
 		if (ret)
 			DRM_ERROR("gen6 sysfs setup failed\n");
 	}
 }

 void i915_teardown_sysfs(struct drm_device *dev)
 {
 	sysfs_remove_files(&dev->primary->kdev.kobj, gen6_attrs);
 	device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 #ifdef CONFIG_PM
 	sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 #endif
 }
	/*
	* Copyright © 2012 Intel Corporation
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	* IN THE SOFTWARE.
	*
	* Authors:
	* Ben Widawsky <ben@bwidawsk.net>
	*
	*/

	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/stat.h>
	#include <linux/sysfs.h>
	#include "intel_drv.h"
	#include "i915_drv.h"

	#ifdef CONFIG_PM
	static u32 calc_residency(struct drm_device *dev, const u32 reg)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u64 raw_time; /* 32b value may overflow during fixed point math */

	if (!intel_enable_rc6(dev))
	return 0;

	raw_time = I915_READ(reg) * 128ULL;
	return DIV_ROUND_UP_ULL(raw_time, 100000);
	}

	static ssize_t
	show_rc6_mask(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
	return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6(dminor->dev));
	}

	static ssize_t
	show_rc6_ms(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
	u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
	return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
	}

	static ssize_t
	show_rc6p_ms(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
	u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
	return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
	}

	static ssize_t
	show_rc6pp_ms(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
	u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
	return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
	}

	static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
	static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
	static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
	static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);

	static struct attribute *rc6_attrs[] = {
	&dev_attr_rc6_enable.attr,
	&dev_attr_rc6_residency_ms.attr,
	&dev_attr_rc6p_residency_ms.attr,
	&dev_attr_rc6pp_residency_ms.attr,
	NULL
	};

	static struct attribute_group rc6_attr_group = {
	.name = power_group_name,
	.attrs = rc6_attrs
	};
	#endif

	static int l3_access_valid(struct drm_device *dev, loff_t offset)
	{
	if (!HAS_L3_GPU_CACHE(dev))
	return -EPERM;

	if (offset % 4 != 0)
	return -EINVAL;

	if (offset >= GEN7_L3LOG_SIZE)
	return -ENXIO;

	return 0;
	}

	static ssize_t
	i915_l3_read(struct file filp, struct kobject kobj,
	struct bin_attribute attr, char buf,
	loff_t offset, size_t count)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
	struct drm_device *drm_dev = dminor->dev;
	struct drm_i915_private *dev_priv = drm_dev->dev_private;
	uint32_t misccpctl;
	int i, ret;

	ret = l3_access_valid(drm_dev, offset);
	if (ret)
	return ret;

	ret = i915_mutex_lock_interruptible(drm_dev);
	if (ret)
	return ret;

	misccpctl = I915_READ(GEN7_MISCCPCTL);
	I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);

	for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
	((uint32_t )(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);

	I915_WRITE(GEN7_MISCCPCTL, misccpctl);

	mutex_unlock(&drm_dev->struct_mutex);

	return i - offset;
	}

	static ssize_t
	i915_l3_write(struct file filp, struct kobject kobj,
	struct bin_attribute attr, char buf,
	loff_t offset, size_t count)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
	struct drm_device *drm_dev = dminor->dev;
	struct drm_i915_private *dev_priv = drm_dev->dev_private;
	u32 temp = NULL; / Just here to make handling failures easy */
	int ret;

	ret = l3_access_valid(drm_dev, offset);
	if (ret)
	return ret;

	ret = i915_mutex_lock_interruptible(drm_dev);
	if (ret)
	return ret;

	if (!dev_priv->l3_parity.remap_info) {
	temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
	if (!temp) {
	mutex_unlock(&drm_dev->struct_mutex);
	return -ENOMEM;
	}
	}

	ret = i915_gpu_idle(drm_dev);
	if (ret) {
	kfree(temp);
	mutex_unlock(&drm_dev->struct_mutex);
	return ret;
	}

	/* TODO: Ideally we really want a GPU reset here to make sure errors
	* aren't propagated. Since I cannot find a stable way to reset the GPU
	* at this point it is left as a TODO.
	*/
	if (temp)
	dev_priv->l3_parity.remap_info = temp;

	memcpy(dev_priv->l3_parity.remap_info + (offset/4),
	buf + (offset/4),
	count);

	i915_gem_l3_remap(drm_dev);

	mutex_unlock(&drm_dev->struct_mutex);

	return count;
	}

	static struct bin_attribute dpf_attrs = {
	.attr = {.name = "l3_parity", .mode = (S_IRUSR \| S_IWUSR)},
	.size = GEN7_L3LOG_SIZE,
	.read = i915_l3_read,
	.write = i915_l3_write,
	.mmap = NULL
	};

	static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
	struct device_attribute attr, char buf)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;

	mutex_lock(&dev_priv->rps.hw_lock);
	ret = dev_priv->rps.cur_delay * GT_FREQUENCY_MULTIPLIER;
	mutex_unlock(&dev_priv->rps.hw_lock);

	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
	}

	static ssize_t gt_max_freq_mhz_show(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;

	mutex_lock(&dev_priv->rps.hw_lock);
	ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
	mutex_unlock(&dev_priv->rps.hw_lock);

	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
	}

	static ssize_t gt_max_freq_mhz_store(struct device *kdev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val, rp_state_cap, hw_max, hw_min, non_oc_max;
	ssize_t ret;

	ret = kstrtou32(buf, 0, &val);
	if (ret)
	return ret;

	val /= GT_FREQUENCY_MULTIPLIER;

	mutex_lock(&dev_priv->rps.hw_lock);

	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
	hw_max = dev_priv->rps.hw_max;
	non_oc_max = (rp_state_cap & 0xff);
	hw_min = ((rp_state_cap & 0xff0000) >> 16);

	if (val < hw_min \|\| val > hw_max \|\| val < dev_priv->rps.min_delay) {
	mutex_unlock(&dev_priv->rps.hw_lock);
	return -EINVAL;
	}

	if (val > non_oc_max)
	DRM_DEBUG("User requested overclocking to %d\n",
	val * GT_FREQUENCY_MULTIPLIER);

	if (dev_priv->rps.cur_delay > val)
	gen6_set_rps(dev_priv->dev, val);

	dev_priv->rps.max_delay = val;

	mutex_unlock(&dev_priv->rps.hw_lock);

	return count;
	}

	static ssize_t gt_min_freq_mhz_show(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int ret;

	mutex_lock(&dev_priv->rps.hw_lock);
	ret = dev_priv->rps.min_delay * GT_FREQUENCY_MULTIPLIER;
	mutex_unlock(&dev_priv->rps.hw_lock);

	return snprintf(buf, PAGE_SIZE, "%d\n", ret);
	}

	static ssize_t gt_min_freq_mhz_store(struct device *kdev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val, rp_state_cap, hw_max, hw_min;
	ssize_t ret;

	ret = kstrtou32(buf, 0, &val);
	if (ret)
	return ret;

	val /= GT_FREQUENCY_MULTIPLIER;

	mutex_lock(&dev_priv->rps.hw_lock);

	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
	hw_max = dev_priv->rps.hw_max;
	hw_min = ((rp_state_cap & 0xff0000) >> 16);

	if (val < hw_min \|\| val > hw_max \|\| val > dev_priv->rps.max_delay) {
	mutex_unlock(&dev_priv->rps.hw_lock);
	return -EINVAL;
	}

	if (dev_priv->rps.cur_delay < val)
	gen6_set_rps(dev_priv->dev, val);

	dev_priv->rps.min_delay = val;

	mutex_unlock(&dev_priv->rps.hw_lock);

	return count;

	}

	static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
	static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO \| S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
	static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO \| S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);


	static ssize_t gt_rp_mhz_show(struct device kdev, struct device_attribute attr, char *buf);
	static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
	static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
	static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);

	/* For now we have a static number of RP states */
	static ssize_t gt_rp_mhz_show(struct device kdev, struct device_attribute attr, char *buf)
	{
	struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
	struct drm_device *dev = minor->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val, rp_state_cap;
	ssize_t ret;

	ret = mutex_lock_interruptible(&dev->struct_mutex);
	if (ret)
	return ret;
	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
	mutex_unlock(&dev->struct_mutex);

	if (attr == &dev_attr_gt_RP0_freq_mhz) {
	val = ((rp_state_cap & 0x0000ff) >> 0) * GT_FREQUENCY_MULTIPLIER;
	} else if (attr == &dev_attr_gt_RP1_freq_mhz) {
	val = ((rp_state_cap & 0x00ff00) >> 8) * GT_FREQUENCY_MULTIPLIER;
	} else if (attr == &dev_attr_gt_RPn_freq_mhz) {
	val = ((rp_state_cap & 0xff0000) >> 16) * GT_FREQUENCY_MULTIPLIER;
	} else {
	BUG();
	}
	return snprintf(buf, PAGE_SIZE, "%d\n", val);
	}

	static const struct attribute *gen6_attrs[] = {
	&dev_attr_gt_cur_freq_mhz.attr,
	&dev_attr_gt_max_freq_mhz.attr,
	&dev_attr_gt_min_freq_mhz.attr,
	&dev_attr_gt_RP0_freq_mhz.attr,
	&dev_attr_gt_RP1_freq_mhz.attr,
	&dev_attr_gt_RPn_freq_mhz.attr,
	NULL,
	};

	void i915_setup_sysfs(struct drm_device *dev)
	{
	int ret;

	#ifdef CONFIG_PM
	if (INTEL_INFO(dev)->gen >= 6) {
	ret = sysfs_merge_group(&dev->primary->kdev.kobj,
	&rc6_attr_group);
	if (ret)
	DRM_ERROR("RC6 residency sysfs setup failed\n");
	}
	#endif
	if (HAS_L3_GPU_CACHE(dev)) {
	ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
	if (ret)
	DRM_ERROR("l3 parity sysfs setup failed\n");
	}

	if (INTEL_INFO(dev)->gen >= 6) {
	ret = sysfs_create_files(&dev->primary->kdev.kobj, gen6_attrs);
	if (ret)
	DRM_ERROR("gen6 sysfs setup failed\n");
	}
	}

	void i915_teardown_sysfs(struct drm_device *dev)
	{
	sysfs_remove_files(&dev->primary->kdev.kobj, gen6_attrs);
	device_remove_bin_file(&dev->primary->kdev, &dpf_attrs);
	#ifdef CONFIG_PM
	sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
	#endif
	}