| Message ID | 20240903202541.430225-5-adrian.larumbe@collabora.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Support fdinfo runtime and memory stats on Panthor | expand |
On Tue, 3 Sep 2024 21:25:38 +0100 Adrián Larumbe <adrian.larumbe@collabora.com> wrote: > This commit introduces a DRM device sysfs attribute that lets UM control > the job accounting status in the device. The knob variable had been brought > in as part of a previous commit, but now we're able to fix it manually. > > As sysfs files are part of a driver's uAPI, describe its legitimate input > values and output format in a documentation file. > > Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com> > --- > Documentation/gpu/panthor.rst | 46 +++++++++++++++++++++++++++ > drivers/gpu/drm/panthor/panthor_drv.c | 39 +++++++++++++++++++++++ > 2 files changed, 85 insertions(+) > create mode 100644 Documentation/gpu/panthor.rst > > diff --git a/Documentation/gpu/panthor.rst b/Documentation/gpu/panthor.rst > new file mode 100644 > index 000000000000..cbf5c4429a2d > --- /dev/null > +++ b/Documentation/gpu/panthor.rst > @@ -0,0 +1,46 @@ > +.. SPDX-License-Identifier: GPL-2.0+ > + > +========================= > + drm/Panthor CSF driver > +========================= > + > +.. _panfrost-usage-stats: > + > +Panthor DRM client usage stats implementation > +============================================== > + > +The drm/Panthor driver implements the DRM client usage stats specification as > +documented in :ref:`drm-client-usage-stats`. > + > +Example of the output showing the implemented key value pairs and entirety of > +the currently possible format options: > + > +:: > + pos: 0 > + flags: 02400002 > + mnt_id: 29 > + ino: 491 > + drm-driver: panthor > + drm-client-id: 10 > + drm-engine-panthor: 111110952750 ns > + drm-cycles-panthor: 94439687187 > + drm-maxfreq-panthor: 1000000000 Hz > + drm-curfreq-panthor: 1000000000 Hz > + drm-total-memory: 16480 KiB > + drm-shared-memory: 0 > + drm-active-memory: 16200 KiB > + drm-resident-memory: 16480 KiB > + drm-purgeable-memory: 0 > + > +Possible `drm-engine-` key names are: `panthor`. > +`drm-curfreq-` values convey the current operating frequency for that engine. > + > +Users must bear in mind that engine and cycle sampling are disabled by default, > +because of power saving concerns. `fdinfo` users and benchmark applications which > +query the fdinfo file must make sure to toggle the job profiling status of the > +driver by writing into the appropriate sysfs node:: > + > + echo <N> > /sys/bus/platform/drivers/panthor/[a-f0-9]*.gpu/profiling > + > +Where `N` is a bit mask where cycle and timestamp sampling are respectively > +enabled by the first and second bits. This should probably be documented in Documentation/ABI/testing/sysfs-driver-panthor too. > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c > index e18838754963..26475db96c41 100644 > --- a/drivers/gpu/drm/panthor/panthor_drv.c > +++ b/drivers/gpu/drm/panthor/panthor_drv.c > @@ -1450,6 +1450,44 @@ static void panthor_remove(struct platform_device *pdev) > panthor_device_unplug(ptdev); > } > > +static ssize_t profiling_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct panthor_device *ptdev = dev_get_drvdata(dev); > + > + return sysfs_emit(buf, "%d\n", ptdev->profile_mask); > +} > + > +static ssize_t profiling_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct panthor_device *ptdev = dev_get_drvdata(dev); > + u32 value; > + int err; > + > + err = kstrtou32(buf, 0, &value); > + if (err) > + return err; > + > + if ((value & ~PANTHOR_DEVICE_PROFILING_ALL) != 0) > + return -EINVAL; > + > + ptdev->profile_mask = value; > + > + return len; > +} > + > +static DEVICE_ATTR_RW(profiling); > + > +static struct attribute *panthor_attrs[] = { > + &dev_attr_profiling.attr, > + NULL, > +}; > + > +ATTRIBUTE_GROUPS(panthor); > + > static const struct of_device_id dt_match[] = { > { .compatible = "rockchip,rk3588-mali" }, > { .compatible = "arm,mali-valhall-csf" }, > @@ -1469,6 +1507,7 @@ static struct platform_driver panthor_driver = { > .name = "panthor", > .pm = pm_ptr(&panthor_pm_ops), > .of_match_table = dt_match, > + .dev_groups = panthor_groups, > }, > }; >
diff --git a/Documentation/gpu/panthor.rst b/Documentation/gpu/panthor.rst new file mode 100644 index 000000000000..cbf5c4429a2d --- /dev/null +++ b/Documentation/gpu/panthor.rst @@ -0,0 +1,46 @@ +.. SPDX-License-Identifier: GPL-2.0+ + +========================= + drm/Panthor CSF driver +========================= + +.. _panfrost-usage-stats: + +Panthor DRM client usage stats implementation +============================================== + +The drm/Panthor driver implements the DRM client usage stats specification as +documented in :ref:`drm-client-usage-stats`. + +Example of the output showing the implemented key value pairs and entirety of +the currently possible format options: + +:: + pos: 0 + flags: 02400002 + mnt_id: 29 + ino: 491 + drm-driver: panthor + drm-client-id: 10 + drm-engine-panthor: 111110952750 ns + drm-cycles-panthor: 94439687187 + drm-maxfreq-panthor: 1000000000 Hz + drm-curfreq-panthor: 1000000000 Hz + drm-total-memory: 16480 KiB + drm-shared-memory: 0 + drm-active-memory: 16200 KiB + drm-resident-memory: 16480 KiB + drm-purgeable-memory: 0 + +Possible `drm-engine-` key names are: `panthor`. +`drm-curfreq-` values convey the current operating frequency for that engine. + +Users must bear in mind that engine and cycle sampling are disabled by default, +because of power saving concerns. `fdinfo` users and benchmark applications which +query the fdinfo file must make sure to toggle the job profiling status of the +driver by writing into the appropriate sysfs node:: + + echo <N> > /sys/bus/platform/drivers/panthor/[a-f0-9]*.gpu/profiling + +Where `N` is a bit mask where cycle and timestamp sampling are respectively +enabled by the first and second bits. diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c index e18838754963..26475db96c41 100644 --- a/drivers/gpu/drm/panthor/panthor_drv.c +++ b/drivers/gpu/drm/panthor/panthor_drv.c @@ -1450,6 +1450,44 @@ static void panthor_remove(struct platform_device *pdev) panthor_device_unplug(ptdev); } +static ssize_t profiling_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct panthor_device *ptdev = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", ptdev->profile_mask); +} + +static ssize_t profiling_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct panthor_device *ptdev = dev_get_drvdata(dev); + u32 value; + int err; + + err = kstrtou32(buf, 0, &value); + if (err) + return err; + + if ((value & ~PANTHOR_DEVICE_PROFILING_ALL) != 0) + return -EINVAL; + + ptdev->profile_mask = value; + + return len; +} + +static DEVICE_ATTR_RW(profiling); + +static struct attribute *panthor_attrs[] = { + &dev_attr_profiling.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(panthor); + static const struct of_device_id dt_match[] = { { .compatible = "rockchip,rk3588-mali" }, { .compatible = "arm,mali-valhall-csf" }, @@ -1469,6 +1507,7 @@ static struct platform_driver panthor_driver = { .name = "panthor", .pm = pm_ptr(&panthor_pm_ops), .of_match_table = dt_match, + .dev_groups = panthor_groups, }, };
This commit introduces a DRM device sysfs attribute that lets UM control the job accounting status in the device. The knob variable had been brought in as part of a previous commit, but now we're able to fix it manually. As sysfs files are part of a driver's uAPI, describe its legitimate input values and output format in a documentation file. Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com> --- Documentation/gpu/panthor.rst | 46 +++++++++++++++++++++++++++ drivers/gpu/drm/panthor/panthor_drv.c | 39 +++++++++++++++++++++++ 2 files changed, 85 insertions(+) create mode 100644 Documentation/gpu/panthor.rst