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Commit ac6ae347 authored by Ben Widawsky's avatar Ben Widawsky Committed by Daniel Vetter
Browse files

drm/i915: Show render P state thresholds in sysfs 



This is useful for userspace utilities which wish to use the previous
interface, specifically for micromanaging the increase/decrease steps by
setting min == max.

Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarBen Widawsky <ben@bwidawsk.net>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 46ddf194

drivers/gpu/drm/i915/i915_sysfs.c

+36 −0
Original line number Diff line number Diff line
@@ -338,10 +338,46 @@ 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 ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);

static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);

static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);

static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);



/* For now we have a static number of RP states */

static ssize_t gt_rp_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;

	u32 val, rp_state_cap;

	ssize_t ret;



	ret = mutex_lock_interruptible(&dev->struct_mutex);

	if (ret)

		return ret;

	rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);

	mutex_unlock(&dev->struct_mutex);



	if (attr == &dev_attr_gt_RP0_freq_mhz) {

		val = ((rp_state_cap & 0x0000ff) >> 0) * GT_FREQUENCY_MULTIPLIER;

	} else if (attr == &dev_attr_gt_RP1_freq_mhz) {

		val = ((rp_state_cap & 0x00ff00) >> 8) * GT_FREQUENCY_MULTIPLIER;

	} else if (attr == &dev_attr_gt_RPn_freq_mhz) {

		val = ((rp_state_cap & 0xff0000) >> 16) * GT_FREQUENCY_MULTIPLIER;

	} else {

		BUG();

	}

	return snprintf(buf, PAGE_SIZE, "%d", val);

}



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_RP0_freq_mhz.attr,

	&dev_attr_gt_RP1_freq_mhz.attr,

	&dev_attr_gt_RPn_freq_mhz.attr,

	NULL,

};