[Intel-gfx] [PATCH 3/4] drm/i915: Allow controlling idle frequency from userspace
Michał Winiarski
michal.winiarski at intel.com
Tue May 17 13:53:05 UTC 2016
Since commit aed242ff7ebb697e4dff912bd4dc7ec7192f7581
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Wed Mar 18 09:48:21 2015 +0000
drm/i915: Relax RPS contraints to allows setting minfreq on idle
When we idle, we set the GPU frequency to the hardware minimum (not user
minimum).
Let's add sysfs/debugfs knobs allowing userspace to control idle
frequency, similar to softmin/softmax frequency.
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Michał Winiarski <michal.winiarski at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 69 ++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/i915_sysfs.c | 69 ++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_pm.c | 20 ++++++-----
3 files changed, 148 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 24f4105..6988213 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5050,7 +5050,9 @@ i915_min_freq_set(void *data, u64 val)
hw_max = dev_priv->rps.max_freq;
hw_min = dev_priv->rps.min_freq;
- if (val < hw_min || val > hw_max || val > dev_priv->rps.max_freq_softlimit) {
+ if (val < hw_min || val > hw_max ||
+ val > dev_priv->rps.max_freq_softlimit ||
+ val < dev_priv->rps.idle_freq) {
mutex_unlock(&dev_priv->rps.hw_lock);
return -EINVAL;
}
@@ -5069,6 +5071,70 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_min_freq_fops,
"%llu\n");
static int
+i915_idle_freq_get(void *data, u64 *val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+
+ if (INTEL_INFO(dev)->gen < 6)
+ return -ENODEV;
+
+ flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
+ ret = mutex_lock_interruptible(&dev_priv->rps.hw_lock);
+ if (ret)
+ return ret;
+
+ *val = intel_gpu_freq(dev_priv, dev_priv->rps.idle_freq);
+ mutex_unlock(&dev_priv->rps.hw_lock);
+
+ return 0;
+}
+
+static int
+i915_idle_freq_set(void *data, u64 val)
+{
+ struct drm_device *dev = data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 hw_max, hw_min;
+ int ret;
+
+ if (INTEL_INFO(dev)->gen < 6)
+ return -ENODEV;
+
+ flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
+ DRM_DEBUG_DRIVER("Manually setting idle freq to %llu\n", val);
+
+ ret = mutex_lock_interruptible(&dev_priv->rps.hw_lock);
+ if (ret)
+ return ret;
+
+ val = intel_freq_opcode(dev_priv, val);
+
+ hw_max = dev_priv->rps.max_freq;
+ hw_min = dev_priv->rps.min_freq;
+
+ if (val < hw_min || val > hw_max || val > dev_priv->rps.min_freq_softlimit) {
+ mutex_unlock(&dev_priv->rps.hw_lock);
+ return -EINVAL;
+ }
+
+ dev_priv->rps.idle_freq = val;
+
+ intel_set_rps(dev_priv, val);
+
+ mutex_unlock(&dev_priv->rps.hw_lock);
+
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(i915_idle_freq_fops,
+ i915_idle_freq_get, i915_idle_freq_set,
+ "%llu\n");
+
+static int
i915_cache_sharing_get(void *data, u64 *val)
{
struct drm_device *dev = data;
@@ -5436,6 +5502,7 @@ static const struct i915_debugfs_files {
{"i915_wedged", &i915_wedged_fops},
{"i915_max_freq", &i915_max_freq_fops},
{"i915_min_freq", &i915_min_freq_fops},
+ {"i915_idle_freq", &i915_idle_freq_fops},
{"i915_cache_sharing", &i915_cache_sharing_fops},
{"i915_ring_stop", &i915_ring_stop_fops},
{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 37b6444..1c6930a 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -445,7 +445,8 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
if (val < dev_priv->rps.min_freq ||
val > dev_priv->rps.max_freq ||
- val > dev_priv->rps.max_freq_softlimit) {
+ val > dev_priv->rps.max_freq_softlimit ||
+ val < dev_priv->rps.idle_freq) {
mutex_unlock(&dev_priv->rps.hw_lock);
intel_runtime_pm_put(dev_priv);
return -EINVAL;
@@ -470,10 +471,74 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
}
+static ssize_t gt_idle_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct drm_minor *minor = dev_to_drm_minor(kdev);
+ struct drm_device *dev = minor->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+
+ flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
+ mutex_lock(&dev_priv->rps.hw_lock);
+ ret = intel_gpu_freq(dev_priv, dev_priv->rps.idle_freq);
+ mutex_unlock(&dev_priv->rps.hw_lock);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", ret);
+}
+static ssize_t gt_idle_freq_mhz_store(struct device *kdev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct drm_minor *minor = dev_to_drm_minor(kdev);
+ struct drm_device *dev = minor->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 val;
+ ssize_t ret;
+
+ ret = kstrtou32(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
+ intel_runtime_pm_get(dev_priv);
+
+ mutex_lock(&dev_priv->rps.hw_lock);
+
+ val = intel_freq_opcode(dev_priv, val);
+
+ if (val < dev_priv->rps.min_freq ||
+ val > dev_priv->rps.max_freq ||
+ val > dev_priv->rps.min_freq_softlimit) {
+ mutex_unlock(&dev_priv->rps.hw_lock);
+ intel_runtime_pm_put(dev_priv);
+ return -EINVAL;
+ }
+
+ dev_priv->rps.idle_freq = val;
+
+ val = clamp_t(int, dev_priv->rps.cur_freq,
+ dev_priv->rps.min_freq_softlimit,
+ dev_priv->rps.max_freq_softlimit);
+
+ /* We still need *_set_rps to process the new min_delay and
+ * update the interrupt limits and PMINTRMSK even though
+ * frequency request may be unchanged. */
+ intel_set_rps(dev_priv, val);
+
+ mutex_unlock(&dev_priv->rps.hw_lock);
+
+ intel_runtime_pm_put(dev_priv);
+
+ return count;
+}
+
static DEVICE_ATTR(gt_act_freq_mhz, S_IRUGO, gt_act_freq_mhz_show, NULL);
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, gt_max_freq_mhz_store);
static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
+static DEVICE_ATTR(gt_idl_freq_mhz, S_IRUGO | S_IWUSR, gt_idle_freq_mhz_show, gt_idle_freq_mhz_store);
static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
@@ -507,6 +572,7 @@ 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,
+ &dev_attr_gt_idl_freq_mhz.attr,
&dev_attr_gt_RP0_freq_mhz.attr,
&dev_attr_gt_RP1_freq_mhz.attr,
&dev_attr_gt_RPn_freq_mhz.attr,
@@ -518,6 +584,7 @@ static const struct attribute *vlv_attrs[] = {
&dev_attr_gt_cur_freq_mhz.attr,
&dev_attr_gt_max_freq_mhz.attr,
&dev_attr_gt_min_freq_mhz.attr,
+ &dev_attr_gt_idl_freq_mhz.attr,
&dev_attr_gt_RP0_freq_mhz.attr,
&dev_attr_gt_RP1_freq_mhz.attr,
&dev_attr_gt_RPn_freq_mhz.attr,
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 287a885..1f84f21 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4954,12 +4954,13 @@ static void gen6_init_rps_frequencies(struct drm_i915_private *dev_priv)
dev_priv->rps.efficient_freq *= GEN9_FREQ_SCALER;
}
- dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
-
- /* Preserve min/max settings in case of re-init */
+ /* Preserve min/max/idle settings in case of re-init */
if (dev_priv->rps.max_freq_softlimit == 0)
dev_priv->rps.max_freq_softlimit = dev_priv->rps.max_freq;
+ if (dev_priv->rps.idle_freq == 0)
+ dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
+
if (dev_priv->rps.min_freq_softlimit == 0) {
if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
dev_priv->rps.min_freq_softlimit =
@@ -5612,12 +5613,14 @@ static void valleyview_init_gt_powersave(struct drm_i915_private *dev_priv)
intel_gpu_freq(dev_priv, dev_priv->rps.min_freq),
dev_priv->rps.min_freq);
- dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
- /* Preserve min/max settings in case of re-init */
+ /* Preserve min/max/idle settings in case of re-init */
if (dev_priv->rps.max_freq_softlimit == 0)
dev_priv->rps.max_freq_softlimit = dev_priv->rps.max_freq;
+ if (dev_priv->rps.idle_freq == 0)
+ dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
+
if (dev_priv->rps.min_freq_softlimit == 0)
dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq;
@@ -5676,12 +5679,13 @@ static void cherryview_init_gt_powersave(struct drm_i915_private *dev_priv)
dev_priv->rps.min_freq) & 1,
"Odd GPU freq values\n");
- dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
-
- /* Preserve min/max settings in case of re-init */
+ /* Preserve min/max/idle settings in case of re-init */
if (dev_priv->rps.max_freq_softlimit == 0)
dev_priv->rps.max_freq_softlimit = dev_priv->rps.max_freq;
+ if (dev_priv->rps.idle_freq == 0)
+ dev_priv->rps.idle_freq = dev_priv->rps.min_freq;
+
if (dev_priv->rps.min_freq_softlimit == 0)
dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq;
--
2.8.0
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