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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Jul 2025 15:00:05.8093 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 015c8e2c-e227-4f14-2879-08ddcb8bf0e9 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B8A.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB11224 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Adri=C3=A1n Larumbe --- drivers/gpu/drm/panthor/panthor_device.c | 7 +- drivers/gpu/drm/panthor/panthor_perf.c | 89 ++++++++++++++++++++++++ drivers/gpu/drm/panthor/panthor_perf.h | 6 ++ 3 files changed, 101 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/pan= thor/panthor_device.c index ab3e65cc17bd..4bcf257e1403 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) { @@ -503,8 +505,10 @@ 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 @@ -568,6 +572,7 @@ 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 fd16039d9244..512bbdb0aac1 100644 --- a/drivers/gpu/drm/panthor/panthor_perf.c +++ b/drivers/gpu/drm/panthor/panthor_perf.c @@ -1845,6 +1845,63 @@ void panthor_perf_session_destroy(struct panthor_fil= e *pfile, struct panthor_per } } =20 +/** + * 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. + * + */ +void panthor_perf_suspend(struct panthor_device *ptdev) +{ + int ret; + struct panthor_perf *perf =3D ptdev->perf; + struct panthor_perf_sampler *sampler; + + if (!perf) + return; + + sampler =3D &perf->sampler; + + if (!atomic_read(&sampler->enabled_clients)) + return; + + ret =3D panthor_perf_fw_stop_sampling(sampler->ptdev); + if (ret) + drm_warn(&ptdev->base, "Could not stop sampling before suspend, err =3D = %d", ret); +} + +/** + * 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. + */ +void panthor_perf_resume(struct panthor_device *ptdev) +{ + int ret; + struct panthor_perf *perf =3D ptdev->perf; + struct panthor_perf_sampler *sampler; + + if (!perf) + return; + + sampler =3D &perf->sampler; + + if (!atomic_read(&sampler->enabled_clients)) + return; + + ret =3D panthor_perf_fw_start_sampling(sampler->ptdev); + if (ret) + drm_warn(&ptdev->base, "Could not resume sampling, err =3D %d", ret); +} + /** * panthor_perf_unplug - Terminate the performance counter subsystem. * @ptdev: Panthor device. @@ -1878,3 +1935,35 @@ 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 (drm_WARN_ON_ONCE(&ptdev->base, !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 (drm_WARN_ON_ONCE(&ptdev->base, !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 5a14854368eb..1044b0a1cfaa 100644 --- a/drivers/gpu/drm/panthor/panthor_perf.h +++ b/drivers/gpu/drm/panthor/panthor_perf.h @@ -14,6 +14,8 @@ struct panthor_file; struct panthor_perf; =20 int panthor_perf_init(struct panthor_device *ptdev); +void panthor_perf_suspend(struct panthor_device *ptdev); +void panthor_perf_resume(struct panthor_device *ptdev); void panthor_perf_unplug(struct panthor_device *ptdev); =20 int panthor_perf_session_setup(struct drm_file *file, struct panthor_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