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From: Lukas Zapolskas <lukas.zapolskas@arm.com>
To: Boris Brezillon <boris.brezillon@collabora.com>,
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Subject: [PATCH v3 6/7] drm/panthor: Add suspend, resume and reset handling
Date: Tue, 1 Apr 2025 16:48:21 +0100
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The sampler must disable and re-enable counter sampling around suspends,
and must re-program the FW interface after a reset to avoid losing
data.
Signed-off-by: Lukas Zapolskas <lukas.zapolskas@arm.com>
---
drivers/gpu/drm/panthor/panthor_device.c | 7 +-
drivers/gpu/drm/panthor/panthor_perf.c | 102 +++++++++++++++++++++++
drivers/gpu/drm/panthor/panthor_perf.h | 6 ++
3 files changed, 114 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/pan=
thor/panthor_device.c
index 7ac985d44655..92624a8717c5 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -139,6 +139,7 @@ static void panthor_device_reset_work(struct work_struc=
t *work)
if (!drm_dev_enter(&ptdev->base, &cookie))
return;
=20
+ panthor_perf_pre_reset(ptdev);
panthor_sched_pre_reset(ptdev);
panthor_fw_pre_reset(ptdev, true);
panthor_mmu_pre_reset(ptdev);
@@ -148,6 +149,7 @@ static void panthor_device_reset_work(struct work_struc=
t *work)
ret =3D panthor_fw_post_reset(ptdev);
atomic_set(&ptdev->reset.pending, 0);
panthor_sched_post_reset(ptdev, ret !=3D 0);
+ panthor_perf_post_reset(ptdev);
drm_dev_exit(cookie);
=20
if (ret) {
@@ -496,8 +498,10 @@ int panthor_device_resume(struct device *dev)
ret =3D panthor_device_resume_hw_components(ptdev);
}
=20
- if (!ret)
+ if (!ret) {
panthor_sched_resume(ptdev);
+ panthor_perf_resume(ptdev);
+ }
=20
drm_dev_exit(cookie);
=20
@@ -561,6 +565,7 @@ int panthor_device_suspend(struct device *dev)
/* We prepare everything as if we were resetting the GPU.
* The end of the reset will happen in the resume path though.
*/
+ panthor_perf_suspend(ptdev);
panthor_sched_suspend(ptdev);
panthor_fw_suspend(ptdev);
panthor_mmu_suspend(ptdev);
diff --git a/drivers/gpu/drm/panthor/panthor_perf.c b/drivers/gpu/drm/panth=
or/panthor_perf.c
index 3cb79b999886..753c65294745 100644
--- a/drivers/gpu/drm/panthor/panthor_perf.c
+++ b/drivers/gpu/drm/panthor/panthor_perf.c
@@ -1803,6 +1803,76 @@ void panthor_perf_session_destroy(struct panthor_fil=
e *pfile, struct panthor_per
}
}
=20
+static int panthor_perf_sampler_resume(struct panthor_perf_sampler *sample=
r)
+{
+ int ret;
+
+ if (!atomic_read(&sampler->enabled_clients))
+ return 0;
+
+ ret =3D panthor_perf_fw_start_sampling(sampler->ptdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int panthor_perf_sampler_suspend(struct panthor_perf_sampler *sampl=
er)
+{
+ int ret;
+
+ if (!atomic_read(&sampler->enabled_clients))
+ return 0;
+
+ ret =3D panthor_perf_fw_stop_sampling(sampler->ptdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * panthor_perf_suspend - Prepare the performance counter subsystem for sy=
stem suspend.
+ * @ptdev: Panthor device.
+ *
+ * Indicate to the performance counters that the system is suspending.
+ *
+ * This function must not be used to handle MCU power state transitions: j=
ust before MCU goes
+ * from on to any inactive state, an automatic sample will be performed by=
the firmware, and
+ * the performance counter firmware state will be restored on warm boot.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int panthor_perf_suspend(struct panthor_device *ptdev)
+{
+ struct panthor_perf *perf =3D ptdev->perf;
+
+ if (!perf)
+ return 0;
+
+ return panthor_perf_sampler_suspend(&perf->sampler);
+}
+
+/**
+ * panthor_perf_resume - Resume the performance counter subsystem after sy=
stem resumption.
+ * @ptdev: Panthor device.
+ *
+ * Indicate to the performance counters that the system has resumed. This =
must not be used
+ * to handle MCU state transitions, for the same reasons as detailed in th=
e kerneldoc for
+ * @panthor_perf_suspend.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int panthor_perf_resume(struct panthor_device *ptdev)
+{
+ struct panthor_perf *perf =3D ptdev->perf;
+
+ if (!perf)
+ return 0;
+
+ return panthor_perf_sampler_resume(&perf->sampler);
+}
+
/**
* panthor_perf_unplug - Terminate the performance counter subsystem.
* @ptdev: Panthor device.
@@ -1836,3 +1906,35 @@ void panthor_perf_unplug(struct panthor_device *ptde=
v)
=20
ptdev->perf =3D NULL;
}
+
+void panthor_perf_pre_reset(struct panthor_device *ptdev)
+{
+ struct panthor_perf_sampler *sampler;
+
+ if (!ptdev || !ptdev->perf)
+ return;
+
+ sampler =3D &ptdev->perf->sampler;
+
+ if (!atomic_read(&sampler->enabled_clients))
+ return;
+
+ panthor_perf_fw_stop_sampling(sampler->ptdev);
+}
+
+void panthor_perf_post_reset(struct panthor_device *ptdev)
+{
+ struct panthor_perf_sampler *sampler;
+
+ if (!ptdev || !ptdev->perf)
+ return;
+
+ sampler =3D &ptdev->perf->sampler;
+
+ if (!atomic_read(&sampler->enabled_clients))
+ return;
+
+ panthor_perf_fw_write_sampler_config(sampler);
+
+ panthor_perf_fw_start_sampling(sampler->ptdev);
+}
diff --git a/drivers/gpu/drm/panthor/panthor_perf.h b/drivers/gpu/drm/panth=
or/panthor_perf.h
index c482198b6fbd..fc08a5440a35 100644
--- a/drivers/gpu/drm/panthor/panthor_perf.h
+++ b/drivers/gpu/drm/panthor/panthor_perf.h
@@ -13,6 +13,8 @@ struct panthor_file;
struct panthor_perf;
=20
int panthor_perf_init(struct panthor_device *ptdev);
+int panthor_perf_suspend(struct panthor_device *ptdev);
+int panthor_perf_resume(struct panthor_device *ptdev);
void panthor_perf_unplug(struct panthor_device *ptdev);
=20
int panthor_perf_session_setup(struct panthor_device *ptdev, struct pantho=
r_perf *perf,
@@ -30,5 +32,9 @@ void panthor_perf_session_destroy(struct panthor_file *pf=
ile, struct panthor_per
=20
void panthor_perf_report_irq(struct panthor_device *ptdev, u32 status);
=20
+void panthor_perf_pre_reset(struct panthor_device *ptdev);
+
+void panthor_perf_post_reset(struct panthor_device *ptdev);
+
#endif /* __PANTHOR_PERF_H__ */
=20
--=20
2.33.0.dirty