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authorJesse Barnes <jbarnes@virtuousgeek.org>2012-05-25 12:34:54 -0700
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-06-04 21:34:47 +0200
commit1523c310b3ed964b71a8db16f70c3bc21cc0642e (patch)
tree3db561824e249baaf113d5e78133e86583ee83da
parentcb1793ce921c7e073f9055847a5bc868ab84244c (diff)
drm/i915: add min freq control to debugfsdrm-intel-next-2012-06-04
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>
-rw-r--r--drivers/gpu/drm/i915/i915_debugfs.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5363e9c66c27..4fa00fcfbc96 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1765,6 +1765,64 @@ static const struct file_operations i915_max_freq_fops = {
};
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,
size_t max,
@@ -1997,6 +2055,12 @@ int i915_debugfs_init(struct drm_minor *minor)
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);
if (ret)
@@ -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,