This makes for easier benchmarking and testing. One can set a fixed frequency by setting min and max to the same value.
Signed-off-by: Jesse Barnes <[email protected]> --- drivers/gpu/drm/i915/i915_debugfs.c | 70 +++++++++++++++++++++++++++++++++++ 1 files changed, 70 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index eb2b3c2..c0b7688 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1765,6 +1765,68 @@ 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 above 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 +2059,12 @@ 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 +2096,8 @@ 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, -- 1.7.4.1 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
