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drm/i915: add min freq control to debugfs

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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: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Eugeni Dodonov <eugeni@dodonov.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2012-05-25 12:34:54 -07:00 committed by Daniel Vetter
parent cb1793ce92
commit 1523c310b3
1 changed files with 66 additions and 0 deletions
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66
drivers/gpu/drm/i915/i915_debugfs.c
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@ -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,