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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 2/7] drm/panthor: Add DEV_QUERY.PERF_INFO handling for Gx10
Date: Tue, 1 Apr 2025 16:48:17 +0100
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This change adds the IOCTL to query data about the performance counter
setup. Some of this data was available via previous DEV_QUERY calls,
for instance for GPU info, but exposing it via PERF_INFO
minimizes the overhead of creating a single session to just the one
aggregate IOCTL.
Signed-off-by: Lukas Zapolskas <lukas.zapolskas@arm.com>
Reviewed-by: Adri=C3=A1n Larumbe <adrian.larumbe@collabora.com>
---
drivers/gpu/drm/panthor/Makefile | 1 +
drivers/gpu/drm/panthor/panthor_device.c | 5 +++
drivers/gpu/drm/panthor/panthor_device.h | 3 ++
drivers/gpu/drm/panthor/panthor_drv.c | 10 ++++-
drivers/gpu/drm/panthor/panthor_fw.h | 3 ++
drivers/gpu/drm/panthor/panthor_perf.c | 55 ++++++++++++++++++++++++
drivers/gpu/drm/panthor/panthor_perf.h | 15 +++++++
include/uapi/drm/panthor_drm.h | 1 +
8 files changed, 92 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/panthor/panthor_perf.c
create mode 100644 drivers/gpu/drm/panthor/panthor_perf.h
diff --git a/drivers/gpu/drm/panthor/Makefile b/drivers/gpu/drm/panthor/Mak=
efile
index 15294719b09c..0df9947f3575 100644
--- a/drivers/gpu/drm/panthor/Makefile
+++ b/drivers/gpu/drm/panthor/Makefile
@@ -9,6 +9,7 @@ panthor-y :=3D \
panthor_gpu.o \
panthor_heap.o \
panthor_mmu.o \
+ panthor_perf.o \
panthor_sched.o
=20
obj-$(CONFIG_DRM_PANTHOR) +=3D panthor.o
diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/pan=
thor/panthor_device.c
index a9da1d1eeb70..76b4cf3dc391 100644
--- a/drivers/gpu/drm/panthor/panthor_device.c
+++ b/drivers/gpu/drm/panthor/panthor_device.c
@@ -19,6 +19,7 @@
#include "panthor_fw.h"
#include "panthor_gpu.h"
#include "panthor_mmu.h"
+#include "panthor_perf.h"
#include "panthor_regs.h"
#include "panthor_sched.h"
=20
@@ -259,6 +260,10 @@ int panthor_device_init(struct panthor_device *ptdev)
if (ret)
goto err_unplug_fw;
=20
+ ret =3D panthor_perf_init(ptdev);
+ if (ret)
+ goto err_unplug_fw;
+
/* ~3 frames */
pm_runtime_set_autosuspend_delay(ptdev->base.dev, 50);
pm_runtime_use_autosuspend(ptdev->base.dev);
diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/pan=
thor/panthor_device.h
index da6574021664..657ccc39568c 100644
--- a/drivers/gpu/drm/panthor/panthor_device.h
+++ b/drivers/gpu/drm/panthor/panthor_device.h
@@ -120,6 +120,9 @@ struct panthor_device {
/** @csif_info: Command stream interface information. */
struct drm_panthor_csif_info csif_info;
=20
+ /** @perf_info: Performance counter interface information. */
+ struct drm_panthor_perf_info perf_info;
+
/** @gpu: GPU management data. */
struct panthor_gpu *gpu;
=20
diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/pantho=
r/panthor_drv.c
index 06fe46e32073..9d2b716cca45 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -175,7 +175,8 @@ panthor_get_uobj_array(const struct drm_panthor_obj_arr=
ay *in, u32 min_stride,
PANTHOR_UOBJ_DECL(struct drm_panthor_sync_op, timeline_value), \
PANTHOR_UOBJ_DECL(struct drm_panthor_queue_submit, syncs), \
PANTHOR_UOBJ_DECL(struct drm_panthor_queue_create, ringbuf_size), \
- PANTHOR_UOBJ_DECL(struct drm_panthor_vm_bind_op, syncs))
+ PANTHOR_UOBJ_DECL(struct drm_panthor_vm_bind_op, syncs), \
+ PANTHOR_UOBJ_DECL(struct drm_panthor_perf_info, shader_blocks))
=20
/**
* PANTHOR_UOBJ_SET() - Copy a kernel object to a user object.
@@ -835,6 +836,10 @@ static int panthor_ioctl_dev_query(struct drm_device *=
ddev, void *data, struct d
args->size =3D sizeof(priorities_info);
return 0;
=20
+ case DRM_PANTHOR_DEV_QUERY_PERF_INFO:
+ args->size =3D sizeof(ptdev->perf_info);
+ return 0;
+
default:
return -EINVAL;
}
@@ -859,6 +864,9 @@ static int panthor_ioctl_dev_query(struct drm_device *d=
dev, void *data, struct d
panthor_query_group_priorities_info(file, &priorities_info);
return PANTHOR_UOBJ_SET(args->pointer, args->size, priorities_info);
=20
+ case DRM_PANTHOR_DEV_QUERY_PERF_INFO:
+ return PANTHOR_UOBJ_SET(args->pointer, args->size, ptdev->perf_info);
+
default:
return -EINVAL;
}
diff --git a/drivers/gpu/drm/panthor/panthor_fw.h b/drivers/gpu/drm/panthor=
/panthor_fw.h
index 6598d96c6d2a..8bcb933fa790 100644
--- a/drivers/gpu/drm/panthor/panthor_fw.h
+++ b/drivers/gpu/drm/panthor/panthor_fw.h
@@ -197,8 +197,11 @@ struct panthor_fw_global_control_iface {
u32 output_va;
u32 group_num;
u32 group_stride;
+#define GLB_PERFCNT_FW_SIZE(x) ((((x) >> 16) << 8))
u32 perfcnt_size;
u32 instr_features;
+#define PERFCNT_FEATURES_MD_SIZE(x) (((x) & GENMASK(3, 0)) << 8)
+ u32 perfcnt_features;
};
=20
struct panthor_fw_global_input_iface {
diff --git a/drivers/gpu/drm/panthor/panthor_perf.c b/drivers/gpu/drm/panth=
or/panthor_perf.c
new file mode 100644
index 000000000000..b0a6f3fca8a9
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_perf.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+/* Copyright 2023 Collabora Ltd */
+/* Copyright 2025 Arm ltd. */
+
+#include <linux/bitops.h>
+#include <drm/panthor_drm.h>
+
+#include "panthor_device.h"
+#include "panthor_fw.h"
+#include "panthor_perf.h"
+
+/**
+ * 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,
+ * which indicates the same information.
+ */
+#define PANTHOR_PERF_COUNTERS_PER_BLOCK (64)
+
+static void panthor_perf_info_init(struct panthor_device *ptdev)
+{
+ struct panthor_fw_global_iface *glb_iface =3D panthor_fw_get_glb_iface(pt=
dev);
+ struct drm_panthor_perf_info *const perf_info =3D &ptdev->perf_info;
+
+ if (PERFCNT_FEATURES_MD_SIZE(glb_iface->control->perfcnt_features))
+ perf_info->flags |=3D DRM_PANTHOR_PERF_BLOCK_STATES_SUPPORT;
+
+ perf_info->counters_per_block =3D PANTHOR_PERF_COUNTERS_PER_BLOCK;
+
+ perf_info->sample_header_size =3D sizeof(struct drm_panthor_perf_sample_h=
eader);
+ perf_info->block_header_size =3D sizeof(struct drm_panthor_perf_block_hea=
der);
+
+ if (GLB_PERFCNT_FW_SIZE(glb_iface->control->perfcnt_size))
+ perf_info->fw_blocks =3D 1;
+
+ perf_info->cshw_blocks =3D 1;
+ perf_info->tiler_blocks =3D 1;
+ perf_info->memsys_blocks =3D DRM_PANTHOR_L2_SLICES(ptdev->gpu_info.mem_fe=
atures);
+ perf_info->shader_blocks =3D hweight64(ptdev->gpu_info.shader_present);
+}
+
+/**
+ * panthor_perf_init - Initialize the performance counter subsystem.
+ * @ptdev: Panthor device
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int panthor_perf_init(struct panthor_device *ptdev)
+{
+ if (!ptdev)
+ return -EINVAL;
+
+ panthor_perf_info_init(ptdev);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/panthor/panthor_perf.h b/drivers/gpu/drm/panth=
or/panthor_perf.h
new file mode 100644
index 000000000000..3c32c24c164c
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_perf.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 or MIT */
+/* Copyright 2025 Collabora Ltd */
+/* Copyright 2025 Arm ltd. */
+
+#ifndef __PANTHOR_PERF_H__
+#define __PANTHOR_PERF_H__
+
+#include <linux/types.h>
+
+struct panthor_device;
+
+int panthor_perf_init(struct panthor_device *ptdev);
+
+#endif /* __PANTHOR_PERF_H__ */
+
diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
index c63cbdddde76..4d352008dffa 100644
--- a/include/uapi/drm/panthor_drm.h
+++ b/include/uapi/drm/panthor_drm.h
@@ -270,6 +270,7 @@ struct drm_panthor_gpu_info {
=20
/** @mem_features: Memory features. */
__u32 mem_features;
+#define DRM_PANTHOR_L2_SLICES(x) ((((x) >> 8) & 0xf) + 1)
=20
/** @mmu_features: MMU features. */
__u32 mmu_features;
--=20
2.33.0.dirty