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.zapols...@arm.com>
Reviewed-by: Adrián Larumbe <adrian.laru...@collabora.com>
---
drivers/gpu/drm/panthor/Makefile | 1 +
drivers/gpu/drm/panthor/panthor_device.c | 7 +++
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 | 77 ++++++++++++++++++++++++
drivers/gpu/drm/panthor/panthor_perf.h | 15 +++++
drivers/gpu/drm/panthor/panthor_regs.h | 1 +
8 files changed, 116 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/Makefile
index 15294719b09c..0df9947f3575 100644
--- a/drivers/gpu/drm/panthor/Makefile
+++ b/drivers/gpu/drm/panthor/Makefile
@@ -9,6 +9,7 @@ panthor-y := \
panthor_gpu.o \
panthor_heap.o \
panthor_mmu.o \
+ panthor_perf.o \
panthor_sched.o
obj-$(CONFIG_DRM_PANTHOR) += panthor.o
diff --git a/drivers/gpu/drm/panthor/panthor_device.c
b/drivers/gpu/drm/panthor/panthor_device.c
index f0b2da5b2b96..15ab329722cc 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"
@@ -264,6 +265,10 @@ int panthor_device_init(struct panthor_device *ptdev)
if (ret)
goto err_unplug_fw;
+ ret = panthor_perf_init(ptdev);
+ if (ret)
+ goto err_unplug_sched;
+
/* ~3 frames */
pm_runtime_set_autosuspend_delay(ptdev->base.dev, 50);
pm_runtime_use_autosuspend(ptdev->base.dev);
@@ -277,6 +282,8 @@ int panthor_device_init(struct panthor_device *ptdev)
err_disable_autosuspend:
pm_runtime_dont_use_autosuspend(ptdev->base.dev);
+
+err_unplug_sched:
panthor_sched_unplug(ptdev);
err_unplug_fw:
diff --git a/drivers/gpu/drm/panthor/panthor_device.h
b/drivers/gpu/drm/panthor/panthor_device.h
index 4fc7cf2aeed5..720d39b9e783 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;
+ /** @perf_info: Performance counter interface information. */
+ struct drm_panthor_perf_info perf_info;
+
/** @gpu: GPU management data. */
struct panthor_gpu *gpu;
diff --git a/drivers/gpu/drm/panthor/panthor_drv.c
b/drivers/gpu/drm/panthor/panthor_drv.c
index 9256806eb662..8b1e3e38b12e 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_array
*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))
/**
* 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 = sizeof(priorities_info);
return 0;
+ case DRM_PANTHOR_DEV_QUERY_PERF_INFO:
+ args->size = sizeof(ptdev->perf_info);
+ return 0;
+
default:
return -EINVAL;
}
@@ -859,6 +864,9 @@ static int panthor_ioctl_dev_query(struct drm_device *ddev,
void *data, struct d
panthor_query_group_priorities_info(file, &priorities_info);
return PANTHOR_UOBJ_SET(args->pointer, args->size,
priorities_info);
+ 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;
};
struct panthor_fw_global_input_iface {
diff --git a/drivers/gpu/drm/panthor/panthor_perf.c
b/drivers/gpu/drm/panthor/panthor_perf.c
new file mode 100644
index 000000000000..e58a62ad7988
--- /dev/null
+++ b/drivers/gpu/drm/panthor/panthor_perf.c
@@ -0,0 +1,77 @@
+// 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"
+#include "panthor_regs.h"
+
+struct panthor_perf_counter_block {
+ struct drm_panthor_perf_block_header header;
+ u64 counters[];
+};
+
+static size_t get_annotated_block_size(size_t counters_per_block)
+{
+ return struct_size_t(struct panthor_perf_counter_block, counters,
counters_per_block);
+}
+
+static size_t session_get_user_sample_size(const struct drm_panthor_perf_info
*const info)
+{
+ const size_t block_size =
get_annotated_block_size(info->counters_per_block);
+ const size_t block_nr = info->cshw_blocks + info->fw_blocks +
+ info->tiler_blocks + info->memsys_blocks + info->shader_blocks;
+
+ return info->sample_header_size + (block_size * block_nr);
+}
+
+/**
+ * PANTHOR_PERF_COUNTERS_PER_BLOCK - On CSF architectures pre-11.x, the number
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 *const ptdev)
+{
+ struct panthor_fw_global_iface *glb_iface =
panthor_fw_get_glb_iface(ptdev);
+ struct drm_panthor_perf_info *const perf_info = &ptdev->perf_info;
+
+ if (PERFCNT_FEATURES_MD_SIZE(glb_iface->control->perfcnt_features))
+ perf_info->flags |= DRM_PANTHOR_PERF_BLOCK_STATES_SUPPORT;
+
+ perf_info->counters_per_block = PANTHOR_PERF_COUNTERS_PER_BLOCK;
+
+ perf_info->sample_header_size = sizeof(struct
drm_panthor_perf_sample_header);
+ perf_info->block_header_size = sizeof(struct
drm_panthor_perf_block_header);
+
+ if (GLB_PERFCNT_FW_SIZE(glb_iface->control->perfcnt_size))
+ perf_info->fw_blocks = 1;
+
+ perf_info->cshw_blocks = 1;
+ perf_info->tiler_blocks = 1;
+ perf_info->memsys_blocks =
GPU_MEM_FEATURES_L2_SLICES(ptdev->gpu_info.mem_features);
+ perf_info->shader_blocks = hweight64(ptdev->gpu_info.shader_present);
+
+ perf_info->sample_size = session_get_user_sample_size(perf_info);
+}
+
+/**
+ * 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/panthor/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/drivers/gpu/drm/panthor/panthor_regs.h
b/drivers/gpu/drm/panthor/panthor_regs.h
index 48bbfd40138c..d613ce723981 100644
--- a/drivers/gpu/drm/panthor/panthor_regs.h
+++ b/drivers/gpu/drm/panthor/panthor_regs.h
@@ -27,6 +27,7 @@
#define GPU_TILER_FEATURES 0xC
#define GPU_MEM_FEATURES 0x10
#define GROUPS_L2_COHERENT BIT(0)
+#define GPU_MEM_FEATURES_L2_SLICES(x) ((((x) &
GENMASK(11, 8)) >> 8) + 1)
#define GPU_MMU_FEATURES 0x14
#define GPU_MMU_FEATURES_VA_BITS(x) ((x) & GENMASK(7, 0))
--
2.33.0.dirty
