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Commit 1523c310 authored by Jesse Barnes's avatar Jesse Barnes Committed by Daniel Vetter
Browse files

drm/i915: add min freq control to debugfs 



This makes for easier benchmarking and testing.  One can set a fixed
frequency by setting min and max to the same value.

v2: fix whitespace & comment (Eugeni)

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: default avatarEugeni Dodonov <eugeni@dodonov.net>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent cb1793ce

drivers/gpu/drm/i915/i915_debugfs.c

+66 −0
Original line number Diff line number Diff line
@@ -1764,6 +1764,64 @@ static const struct file_operations i915_max_freq_fops = { 
	.llseek = default_llseek,

};



static ssize_t

i915_min_freq_read(struct file *filp, char __user *ubuf, size_t max,

		   loff_t *ppos)

{

	struct drm_device *dev = filp->private_data;

	drm_i915_private_t *dev_priv = dev->dev_private;

	char buf[80];

	int len;



	len = snprintf(buf, sizeof(buf),

		       "min freq: %d\n", dev_priv->min_delay * 50);



	if (len > sizeof(buf))

		len = sizeof(buf);



	return simple_read_from_buffer(ubuf, max, ppos, buf, len);

}



static ssize_t

i915_min_freq_write(struct file *filp, const char __user *ubuf, size_t cnt,

		    loff_t *ppos)

{

	struct drm_device *dev = filp->private_data;

	struct drm_i915_private *dev_priv = dev->dev_private;

	char buf[20];

	int val = 1;



	if (cnt > 0) {

		if (cnt > sizeof(buf) - 1)

			return -EINVAL;



		if (copy_from_user(buf, ubuf, cnt))

			return -EFAULT;

		buf[cnt] = 0;



		val = simple_strtoul(buf, NULL, 0);

	}



	DRM_DEBUG_DRIVER("Manually setting min freq to %d\n", val);



	/*

	 * Turbo will still be enabled, but won't go below the set value.

	 */

	dev_priv->min_delay = val / 50;



	gen6_set_rps(dev, val / 50);



	return cnt;

}



static const struct file_operations i915_min_freq_fops = {

	.owner = THIS_MODULE,

	.open = simple_open,

	.read = i915_min_freq_read,

	.write = i915_min_freq_write,

	.llseek = default_llseek,

};



static ssize_t

i915_cache_sharing_read(struct file *filp,

		   char __user *ubuf,
@@ -1996,6 +2054,12 @@ int i915_debugfs_init(struct drm_minor *minor) 
	if (ret)

		return ret;



	ret = i915_debugfs_create(minor->debugfs_root, minor,

				  "i915_min_freq",

				  &i915_min_freq_fops);

	if (ret)

		return ret;



	ret = i915_debugfs_create(minor->debugfs_root, minor,

				  "i915_cache_sharing",

				  &i915_cache_sharing_fops);
@@ -2028,6 +2092,8 @@ void i915_debugfs_cleanup(struct drm_minor *minor) 
				 1, minor);

	drm_debugfs_remove_files((struct drm_info_list *) &i915_max_freq_fops,

				 1, minor);

	drm_debugfs_remove_files((struct drm_info_list *) &i915_min_freq_fops,

				 1, minor);

	drm_debugfs_remove_files((struct drm_info_list *) &i915_cache_sharing_fops,

				 1, minor);

	drm_debugfs_remove_files((struct drm_info_list *) &i915_ring_stop_fops,