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From: Lukas Zapolskas <lukas.zapolskas@arm.com>
To: Boris Brezillon <boris.brezillon@collabora.com>,
Steven Price <steven.price@arm.com>,
Liviu Dudau <liviu.dudau@arm.com>,
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Subject: [PATCH v3 3/7] drm/panthor: Add panthor perf initialization and
termination
Date: Tue, 1 Apr 2025 16:48:18 +0100
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Added the panthor_perf system initialization and unplug code to allow
for the handling of userspace sessions to be added in follow-up
patches.
Signed-off-by: Lukas Zapolskas <lukas.zapolskas@arm.com>
---
drivers/gpu/drm/panthor/panthor_device.c | 2 +
drivers/gpu/drm/panthor/panthor_device.h | 5 +-
drivers/gpu/drm/panthor/panthor_perf.c | 62 +++++++++++++++++++++++-
drivers/gpu/drm/panthor/panthor_perf.h | 1 +
4 files changed, 68 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/pan=
thor/panthor_device.c
index 76b4cf3dc391..7ac985d44655 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -98,6 +98,7 @@ void panthor_device_unplug(struct panthor_device *ptdev)
/* Now, try to cleanly shutdown the GPU before the device resources
* get reclaimed.
*/
+ panthor_perf_unplug(ptdev);
panthor_sched_unplug(ptdev);
panthor_fw_unplug(ptdev);
panthor_mmu_unplug(ptdev);
@@ -277,6 +278,7 @@ int panthor_device_init(struct panthor_device *ptdev)
=20
err_disable_autosuspend:
pm_runtime_dont_use_autosuspend(ptdev->base.dev);
+ panthor_perf_unplug(ptdev);
panthor_sched_unplug(ptdev);
=20
err_unplug_fw:
diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/pan=
thor/panthor_device.h
index 657ccc39568c..818c4d96d448 100644
--- a/drivers/gpu/drm/panthor/panthor_device.h
+++ b/drivers/gpu/drm/panthor/panthor_device.h
@@ -27,7 +27,7 @@ struct panthor_heap_pool;
struct panthor_job;
struct panthor_mmu;
struct panthor_fw;
-struct panthor_perfcnt;
+struct panthor_perf;
struct panthor_vm;
struct panthor_vm_pool;
=20
@@ -138,6 +138,9 @@ struct panthor_device {
/** @devfreq: Device frequency scaling management data. */
struct panthor_devfreq *devfreq;
=20
+ /** @perf: Performance counter management data. */
+ struct panthor_perf *perf;
+
/** @unplug: Device unplug related fields. */
struct {
/** @lock: Lock used to serialize unplug operations. */
diff --git a/drivers/gpu/drm/panthor/panthor_perf.c b/drivers/gpu/drm/panth=
or/panthor_perf.c
index b0a6f3fca8a9..7c59c8642b7c 100644
--- a/drivers/gpu/drm/panthor/panthor_perf.c
+++ b/drivers/gpu/drm/panthor/panthor_perf.c
@@ -9,6 +9,19 @@
#include "panthor_fw.h"
#include "panthor_perf.h"
=20
+struct panthor_perf {
+ /** @next_session: The ID of the next session. */
+ u32 next_session;
+
+ /** @session_range: The number of sessions supported at a time. */
+ struct xa_limit session_range;
+
+ /**
+ * @sessions: Global map of sessions, accessed by their ID.
+ */
+ struct xarray sessions;
+};
+
/**
* PANTHOR_PERF_COUNTERS_PER_BLOCK - On CSF architectures pre-11.x, the nu=
mber of counters
* per block was hardcoded to be 64. Arch 11.0 onwards supports the PRFCNT=
_FEATURES GPU register,
@@ -42,14 +55,61 @@ static void panthor_perf_info_init(struct panthor_devic=
e *ptdev)
* panthor_perf_init - Initialize the performance counter subsystem.
* @ptdev: Panthor device
*
+ * The performance counters require the FW interface to be available to se=
tup the
+ * sampling ringbuffers, so this must be called only after FW is initializ=
ed.
+ *
* Return: 0 on success, negative error code on failure.
*/
int panthor_perf_init(struct panthor_device *ptdev)
{
+ struct panthor_perf *perf __free(kfree) =3D NULL;
+ int ret =3D 0;
+
if (!ptdev)
return -EINVAL;
=20
panthor_perf_info_init(ptdev);
=20
- return 0;
+ perf =3D kzalloc(sizeof(*perf), GFP_KERNEL);
+ if (ZERO_OR_NULL_PTR(perf))
+ return -ENOMEM;
+
+ xa_init_flags(&perf->sessions, XA_FLAGS_ALLOC);
+
+ perf->session_range =3D (struct xa_limit) {
+ .min =3D 0,
+ .max =3D 1,
+ };
+
+ drm_info(&ptdev->base, "Performance counter subsystem initialized");
+
+ ptdev->perf =3D no_free_ptr(perf);
+
+ return ret;
+}
+
+/**
+ * panthor_perf_unplug - Terminate the performance counter subsystem.
+ * @ptdev: Panthor device.
+ *
+ * This function will terminate the performance counter control structures=
and any remaining
+ * sessions, after waiting for any pending interrupts.
+ */
+void panthor_perf_unplug(struct panthor_device *ptdev)
+{
+ struct panthor_perf *perf =3D ptdev->perf;
+
+ if (!perf)
+ return;
+
+ if (!xa_empty(&perf->sessions)) {
+ drm_err(&ptdev->base,
+ "Performance counter sessions active when unplugging the driver!");
+ }
+
+ xa_destroy(&perf->sessions);
+
+ kfree(ptdev->perf);
+
+ ptdev->perf =3D NULL;
}
diff --git a/drivers/gpu/drm/panthor/panthor_perf.h b/drivers/gpu/drm/panth=
or/panthor_perf.h
index 3c32c24c164c..e4805727b9e7 100644
--- a/drivers/gpu/drm/panthor/panthor_perf.h
+++ b/drivers/gpu/drm/panthor/panthor_perf.h
@@ -10,6 +10,7 @@
struct panthor_device;
=20
int panthor_perf_init(struct panthor_device *ptdev);
+void panthor_perf_unplug(struct panthor_device *ptdev);
=20
#endif /* __PANTHOR_PERF_H__ */
=20
--=20
2.33.0.dirty