| Message ID | 20210127194047.21462-1-christianshewitt@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/lima: add governor data with pre-defined thresholds | expand |
On 1/27/21 7:40 PM, Christian Hewitt wrote: > This patch adapts the panfrost pre-defined thresholds change [0] to the > lima driver to improve real-world performance. The upthreshold value has > been set to ramp GPU frequency to max freq faster (compared to panfrost) > to compensate for the lower overall performance of utgard devices. > > [0] https://patchwork.kernel.org/project/dri-devel/patch/20210121170445.19761-1-lukasz.luba@arm.com/ > > Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> > --- > Change since v1: increased upthreshold from 20 to 30, with a soft > dependency on Lukasz delayed timer patch [0] > > [0] https://lore.kernel.org/lkml/20210127105121.20345-1-lukasz.luba@arm.com/ > > drivers/gpu/drm/lima/lima_devfreq.c | 10 +++++++++- > drivers/gpu/drm/lima/lima_devfreq.h | 2 ++ > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c > index 5686ad4aaf7c..c9854315a0b5 100644 > --- a/drivers/gpu/drm/lima/lima_devfreq.c > +++ b/drivers/gpu/drm/lima/lima_devfreq.c > @@ -163,8 +163,16 @@ int lima_devfreq_init(struct lima_device *ldev) > lima_devfreq_profile.initial_freq = cur_freq; > dev_pm_opp_put(opp); > > + /* > + * Setup default thresholds for the simple_ondemand governor. > + * The values are chosen based on experiments. > + */ > + ldevfreq->gov_data.upthreshold = 30; > + ldevfreq->gov_data.downdifferential = 5; > + > devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile, > - DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL); > + DEVFREQ_GOV_SIMPLE_ONDEMAND, > + &ldevfreq->gov_data); > if (IS_ERR(devfreq)) { > dev_err(dev, "Couldn't initialize GPU devfreq\n"); > ret = PTR_ERR(devfreq); > diff --git a/drivers/gpu/drm/lima/lima_devfreq.h b/drivers/gpu/drm/lima/lima_devfreq.h > index 2d9b3008ce77..b0c7c736e81a 100644 > --- a/drivers/gpu/drm/lima/lima_devfreq.h > +++ b/drivers/gpu/drm/lima/lima_devfreq.h > @@ -4,6 +4,7 @@ > #ifndef __LIMA_DEVFREQ_H__ > #define __LIMA_DEVFREQ_H__ > > +#include <linux/devfreq.h> > #include <linux/spinlock.h> > #include <linux/ktime.h> > > @@ -18,6 +19,7 @@ struct lima_devfreq { > struct opp_table *clkname_opp_table; > struct opp_table *regulators_opp_table; > struct thermal_cooling_device *cooling; > + struct devfreq_simple_ondemand_data gov_data; > > ktime_t busy_time; > ktime_t idle_time; > It looks good. Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Regards, Lukasz
This patch gets minor improvement on glmark2 (160->162). Seems there's no way for user to change this value, do we? Or there's work pending to expose it to sysfs? Regards, Qiang On Thu, Jan 28, 2021 at 3:40 AM Christian Hewitt <christianshewitt@gmail.com> wrote: > > This patch adapts the panfrost pre-defined thresholds change [0] to the > lima driver to improve real-world performance. The upthreshold value has > been set to ramp GPU frequency to max freq faster (compared to panfrost) > to compensate for the lower overall performance of utgard devices. > > [0] https://patchwork.kernel.org/project/dri-devel/patch/20210121170445.19761-1-lukasz.luba@arm.com/ > > Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> > --- > Change since v1: increased upthreshold from 20 to 30, with a soft > dependency on Lukasz delayed timer patch [0] > > [0] https://lore.kernel.org/lkml/20210127105121.20345-1-lukasz.luba@arm.com/ > > drivers/gpu/drm/lima/lima_devfreq.c | 10 +++++++++- > drivers/gpu/drm/lima/lima_devfreq.h | 2 ++ > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c > index 5686ad4aaf7c..c9854315a0b5 100644 > --- a/drivers/gpu/drm/lima/lima_devfreq.c > +++ b/drivers/gpu/drm/lima/lima_devfreq.c > @@ -163,8 +163,16 @@ int lima_devfreq_init(struct lima_device *ldev) > lima_devfreq_profile.initial_freq = cur_freq; > dev_pm_opp_put(opp); > > + /* > + * Setup default thresholds for the simple_ondemand governor. > + * The values are chosen based on experiments. > + */ > + ldevfreq->gov_data.upthreshold = 30; > + ldevfreq->gov_data.downdifferential = 5; > + > devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile, > - DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL); > + DEVFREQ_GOV_SIMPLE_ONDEMAND, > + &ldevfreq->gov_data); > if (IS_ERR(devfreq)) { > dev_err(dev, "Couldn't initialize GPU devfreq\n"); > ret = PTR_ERR(devfreq); > diff --git a/drivers/gpu/drm/lima/lima_devfreq.h b/drivers/gpu/drm/lima/lima_devfreq.h > index 2d9b3008ce77..b0c7c736e81a 100644 > --- a/drivers/gpu/drm/lima/lima_devfreq.h > +++ b/drivers/gpu/drm/lima/lima_devfreq.h > @@ -4,6 +4,7 @@ > #ifndef __LIMA_DEVFREQ_H__ > #define __LIMA_DEVFREQ_H__ > > +#include <linux/devfreq.h> > #include <linux/spinlock.h> > #include <linux/ktime.h> > > @@ -18,6 +19,7 @@ struct lima_devfreq { > struct opp_table *clkname_opp_table; > struct opp_table *regulators_opp_table; > struct thermal_cooling_device *cooling; > + struct devfreq_simple_ondemand_data gov_data; > > ktime_t busy_time; > ktime_t idle_time; > -- > 2.17.1 >
On 1/30/21 1:57 PM, Qiang Yu wrote: > This patch gets minor improvement on glmark2 (160->162). It has bigger impact when the load is changing and the frequency is stuck to min w/o this patch. > > Seems there's no way for user to change this value, do we? > Or there's work pending to expose it to sysfs? True there is no user sysfs. I've proposed a patch to export these via sysfs. Chanwoo is going to work on it. When it will land mainline, it's probably a few months. So for now, the fix makes sense. Regards, Lukasz
OK, I see. Patch is also: Reviewed-by: Qiang Yu <yuq825@gmail.com> Regards, Qiang On Mon, Feb 1, 2021 at 5:59 PM Lukasz Luba <lukasz.luba@arm.com> wrote: > > > > On 1/30/21 1:57 PM, Qiang Yu wrote: > > This patch gets minor improvement on glmark2 (160->162). > > It has bigger impact when the load is changing and the frequency > is stuck to min w/o this patch. > > > > > Seems there's no way for user to change this value, do we? > > Or there's work pending to expose it to sysfs? > > True there is no user sysfs. I've proposed a patch to export these via > sysfs. Chanwoo is going to work on it. When it will land mainline, it's > probably a few months. So for now, the fix makes sense. > > Regards, > Lukasz >
Applied to drm-misc-next. Regards, Qiang On Tue, Feb 2, 2021 at 9:04 AM Qiang Yu <yuq825@gmail.com> wrote: > > OK, I see. Patch is also: > Reviewed-by: Qiang Yu <yuq825@gmail.com> > > Regards, > Qiang > > On Mon, Feb 1, 2021 at 5:59 PM Lukasz Luba <lukasz.luba@arm.com> wrote: > > > > > > > > On 1/30/21 1:57 PM, Qiang Yu wrote: > > > This patch gets minor improvement on glmark2 (160->162). > > > > It has bigger impact when the load is changing and the frequency > > is stuck to min w/o this patch. > > > > > > > > Seems there's no way for user to change this value, do we? > > > Or there's work pending to expose it to sysfs? > > > > True there is no user sysfs. I've proposed a patch to export these via > > sysfs. Chanwoo is going to work on it. When it will land mainline, it's > > probably a few months. So for now, the fix makes sense. > > > > Regards, > > Lukasz > >
diff --git a/drivers/gpu/drm/lima/lima_devfreq.c b/drivers/gpu/drm/lima/lima_devfreq.c index 5686ad4aaf7c..c9854315a0b5 100644 --- a/drivers/gpu/drm/lima/lima_devfreq.c +++ b/drivers/gpu/drm/lima/lima_devfreq.c @@ -163,8 +163,16 @@ int lima_devfreq_init(struct lima_device *ldev) lima_devfreq_profile.initial_freq = cur_freq; dev_pm_opp_put(opp); + /* + * Setup default thresholds for the simple_ondemand governor. + * The values are chosen based on experiments. + */ + ldevfreq->gov_data.upthreshold = 30; + ldevfreq->gov_data.downdifferential = 5; + devfreq = devm_devfreq_add_device(dev, &lima_devfreq_profile, - DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL); + DEVFREQ_GOV_SIMPLE_ONDEMAND, + &ldevfreq->gov_data); if (IS_ERR(devfreq)) { dev_err(dev, "Couldn't initialize GPU devfreq\n"); ret = PTR_ERR(devfreq); diff --git a/drivers/gpu/drm/lima/lima_devfreq.h b/drivers/gpu/drm/lima/lima_devfreq.h index 2d9b3008ce77..b0c7c736e81a 100644 --- a/drivers/gpu/drm/lima/lima_devfreq.h +++ b/drivers/gpu/drm/lima/lima_devfreq.h @@ -4,6 +4,7 @@ #ifndef __LIMA_DEVFREQ_H__ #define __LIMA_DEVFREQ_H__ +#include <linux/devfreq.h> #include <linux/spinlock.h> #include <linux/ktime.h> @@ -18,6 +19,7 @@ struct lima_devfreq { struct opp_table *clkname_opp_table; struct opp_table *regulators_opp_table; struct thermal_cooling_device *cooling; + struct devfreq_simple_ondemand_data gov_data; ktime_t busy_time; ktime_t idle_time;
This patch adapts the panfrost pre-defined thresholds change [0] to the lima driver to improve real-world performance. The upthreshold value has been set to ramp GPU frequency to max freq faster (compared to panfrost) to compensate for the lower overall performance of utgard devices. [0] https://patchwork.kernel.org/project/dri-devel/patch/20210121170445.19761-1-lukasz.luba@arm.com/ Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> --- Change since v1: increased upthreshold from 20 to 30, with a soft dependency on Lukasz delayed timer patch [0] [0] https://lore.kernel.org/lkml/20210127105121.20345-1-lukasz.luba@arm.com/ drivers/gpu/drm/lima/lima_devfreq.c | 10 +++++++++- drivers/gpu/drm/lima/lima_devfreq.h | 2 ++ 2 files changed, 11 insertions(+), 1 deletion(-)