@@ -203,6 +203,69 @@ static struct bin_attribute dpf_attrs = {
.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;
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ return ret;
+
+ ret = dev_priv->rps.cur_delay * GT_FREQUENCY_MULTIPLIER;
+ mutex_unlock(&dev->struct_mutex);
+
+ return snprintf(buf, PAGE_SIZE, "%d", 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;
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ return ret;
+
+ ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
+ mutex_unlock(&dev->struct_mutex);
+
+ return snprintf(buf, PAGE_SIZE, "%d", ret);
+}
+
+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;
+
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ return ret;
+
+ ret = dev_priv->rps.min_delay * GT_FREQUENCY_MULTIPLIER;
+ mutex_unlock(&dev->struct_mutex);
+
+ return snprintf(buf, PAGE_SIZE, "%d", ret);
+}
+
+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, NULL);
+static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, NULL);
+
+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,
+ NULL,
+};
+
void i915_setup_sysfs(struct drm_device *dev)
{
int ret;
@@ -220,10 +283,17 @@ void i915_setup_sysfs(struct drm_device *dev)
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);
sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
}
Userspace applications such as PowerTOP are interesting in being able to read the current GPU frequency. The patch itself sets up a generic array for gen6 attributes so we can easily add other items in the future (and it also happens to be just about the cleanest way to do this). The patch is a nice addition to commit 1ac02185dff3afac146d745ba220dc6672d1d162 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Thu Aug 30 13:26:48 2012 +0200 drm/i915: add a tracepoint for gpu frequency changes Reading the GPU frequncy can be done by reading a file like: /sys/class/drm/card0/render_frequency_mhz Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> --- v2: rename the sysfs file to gt_cur_freq_mhz (Daniel) Use kdev naming (Chris) Use DEVICE_ATTR over __ATTR (Ben) Add min/max freq (Ben/Daniel) user the new #define for frequency multiplier --- drivers/gpu/drm/i915/i915_sysfs.c | 70 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+)