[Intel-gfx] [PATCH] drm/i915: Better overclock support
Daniel Vetter
daniel at ffwll.ch
Wed Apr 3 10:27:22 CEST 2013
On Wed, Apr 3, 2013 at 4:45 AM, Ben Widawsky <ben at bwidawsk.net> wrote:
> Most importantly this will allow users to set overclock frequencies in
> sysfs. Previously the max was limited by the RP0 max as opposed to the
> overclock max. This is useful if one wants to either limit the max
> overclock frequency, or set the minimum frequency to be in the overclock
> range. It also fixes an issue where if one sets the max frequency to be
> below the overclock max, they wouldn't be able to set back the proper
> overclock max.
>
> In addition I've added a couple of other bits:
> Show the overclock freq. as max in sysfs
> Print the overclock max in debugfs.
> Print a warning if the user sets the min frequency to be in the
> overclock range.
>
> In this patch I've decided to store the hw_max when we read it from the
> pcode at init. The reason I do this is the pcode reads can fail, and are
> slow.
>
> Reported-by: freezer?
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
>
I think we should go one step further and set the default max to rp0 and
not the overclocked max. That way users can set the BIOS to the highest it
allows without risking that their machines will hang right away.
Then we could switch the debug printk to max (we don't really care about
the min being too high) and mark all such bugs as wontfix ;-)
-Daniel
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_sysfs.c | 12 ++++++++----
> drivers/gpu/drm/i915/intel_pm.c | 3 ++-
> 4 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 7df8351..f081bb3 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1006,6 +1006,9 @@ static int i915_cur_delayinfo(struct seq_file *m,
> void *unused)
> max_freq = rp_state_cap & 0xff;
> seq_printf(m, "Max non-overclocked (RP0) frequency:
> %dMHz\n",
> max_freq * GT_FREQUENCY_MULTIPLIER);
> +
> + seq_printf(m, "Max overclocked frequency: %dMHz\n",
> + dev_priv->rps.hw_max * GT_FREQUENCY_MULTIPLIER);
> } else {
> seq_printf(m, "no P-state info available\n");
> }
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index 1657d873..9b53b39c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -648,6 +648,7 @@ struct intel_gen6_power_mgmt {
> u8 cur_delay;
> u8 min_delay;
> u8 max_delay;
> + u8 hw_max;
>
> struct delayed_work delayed_resume_work;
>
> diff --git a/drivers/gpu/drm/i915/i915_sysfs.c
> b/drivers/gpu/drm/i915/i915_sysfs.c
> index a3a3e22..5faf1a7 100644
> --- a/drivers/gpu/drm/i915/i915_sysfs.c
> +++ b/drivers/gpu/drm/i915/i915_sysfs.c
> @@ -226,7 +226,7 @@ static ssize_t gt_max_freq_mhz_show(struct device
> *kdev, struct device_attribute
> int ret;
>
> mutex_lock(&dev_priv->rps.hw_lock);
> - ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
> + ret = dev_priv->rps.hw_max * GT_FREQUENCY_MULTIPLIER;
> mutex_unlock(&dev_priv->rps.hw_lock);
>
> return snprintf(buf, PAGE_SIZE, "%d\n", ret);
> @@ -251,7 +251,7 @@ static ssize_t gt_max_freq_mhz_store(struct device
> *kdev,
> mutex_lock(&dev_priv->rps.hw_lock);
>
> rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
> - hw_max = (rp_state_cap & 0xff);
> + hw_max = dev_priv->rps.hw_max;
> hw_min = ((rp_state_cap & 0xff0000) >> 16);
>
> if (val < hw_min || val > hw_max || val < dev_priv->rps.min_delay)
> {
> @@ -290,7 +290,7 @@ static ssize_t gt_min_freq_mhz_store(struct device
> *kdev,
> 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, hw_max, hw_min;
> + u32 val, rp_state_cap, hw_max, hw_min, non_oc_max;
> ssize_t ret;
>
> ret = kstrtou32(buf, 0, &val);
> @@ -302,7 +302,8 @@ static ssize_t gt_min_freq_mhz_store(struct device
> *kdev,
> mutex_lock(&dev_priv->rps.hw_lock);
>
> rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
> - hw_max = (rp_state_cap & 0xff);
> + hw_max = dev_priv->rps.hw_max;
> + non_oc_max = (rp_state_cap & 0xff);
> hw_min = ((rp_state_cap & 0xff0000) >> 16);
>
> if (val < hw_min || val > hw_max || val > dev_priv->rps.max_delay)
> {
> @@ -310,6 +311,9 @@ static ssize_t gt_min_freq_mhz_store(struct device
> *kdev,
> return -EINVAL;
> }
>
> + if (val > non_oc_max)
> + DRM_DEBUG("User selected overclocked frequency for min\n");
> +
> if (dev_priv->rps.cur_delay < val)
> gen6_set_rps(dev_priv->dev, val);
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index ce3db2c..2edb743 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2555,7 +2555,7 @@ static void gen6_enable_rps(struct drm_device *dev)
> gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
>
> /* In units of 100MHz */
> - dev_priv->rps.max_delay = rp_state_cap & 0xff;
> + dev_priv->rps.hw_max = dev_priv->rps.max_delay = rp_state_cap &
> 0xff;
> dev_priv->rps.min_delay = (rp_state_cap & 0xff0000) >> 16;
> dev_priv->rps.cur_delay = 0;
>
> @@ -2635,6 +2635,7 @@ static void gen6_enable_rps(struct drm_device *dev)
> DRM_DEBUG_DRIVER("overclocking supported,
> adjusting frequency max from %dMHz to %dMHz\n",
> (dev_priv->rps.max_delay & 0xff)
> * 50,
> (pcu_mbox & 0xff) * 50);
> + dev_priv->rps.hw_max = pcu_mbox & 0xff;
> dev_priv->rps.max_delay = pcu_mbox & 0xff;
> }
> } else {
> --
> 1.8.2
>
> _______________________________________________
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> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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