Load classification is used for predictive governor to control
eu/slice/subslice based on workloads.
sysfs is provided to enable/disable the feature
V2:
* Fix code style.
* Move predictive_load_timer into a drm_i915_private
structure.
* Make generic function to set optimum config. (Tvrtko Ursulin)
V3:
* Rebase.
* Fix race condition for predictive load set.
* Add slack to start hrtimer for more power efficient. (Tvrtko Ursulin)
V4:
* Fix data type and initialization of mutex to protect predictive load
state.
* Move predictive timer init to i915_gem_init_early. (Tvrtko Ursulin)
* Move debugfs to kernel parameter.
V5:
* Rebase.
* Remove mutex for pred_timer
V6:
* Rebase.
* Fix warnings.
V7:
* Drop timer and move logic to __execlists_update_reg_state. (Tvrtko Ursulin)
* Remove kernel boot param and make it to sysfs entry. (Jani Nikula)
Cc: Vipin Anand <vipin.anand@xxxxxxxxx>
Signed-off-by: Ankit Navik <ankit.p.navik@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_sysfs.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 45d32ef42787..5d76e4992c8d 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -433,12 +433,43 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
return ret ?: count;
}
+static ssize_t deu_enable_show(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+ struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", i915->predictive_load_enable);
+}
+
+static ssize_t deu_enable_store(struct device *kdev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
+ ssize_t ret;
+ u32 val;
+
+ ret = kstrtou32(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ /* Check invalid values */
+ if (val != 0 && val != 1)
+ ret = -EINVAL;
+
+ i915->predictive_load_enable = val;
+
+ return count;
+}
+
static DEVICE_ATTR_RO(gt_act_freq_mhz);
static DEVICE_ATTR_RO(gt_cur_freq_mhz);
static DEVICE_ATTR_RW(gt_boost_freq_mhz);
static DEVICE_ATTR_RW(gt_max_freq_mhz);
static DEVICE_ATTR_RW(gt_min_freq_mhz);
+static DEVICE_ATTR_RW(deu_enable);
+
static DEVICE_ATTR_RO(vlv_rpe_freq_mhz);
static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
@@ -474,6 +505,7 @@ static const struct attribute * const gen6_attrs[] = {
&dev_attr_gt_RP0_freq_mhz.attr,
&dev_attr_gt_RP1_freq_mhz.attr,
&dev_attr_gt_RPn_freq_mhz.attr,
+ &dev_attr_deu_enable.attr,
NULL,
};
--
2.7.4
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