[RFC 01/10] drm/amdgpu: implement PMC ioctl framework

[Zhu Lingshan <lingshan.zhu@amd.com>]

This commit implements basic ioctl framework for PMC,
including basic operations.

This commit also implements AMDGPU_PROFILER_OP_VERSION
which report profiler version to the user space.

Signed-off-by: Zhu Lingshan <lingshan.zhu@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile          |  2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c      |  2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c | 44 ++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.h | 33 +++++++++++++++
 include/uapi/drm/amdgpu_drm.h                | 36 ++++++++++++++++
 5 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.h

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 6fb0a913e33b..d7db69e9d6a0 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -72,7 +72,7 @@ amdgpu-y += amdgpu_device.o amdgpu_reg_access.o amdgpu_doorbell_mgr.o amdgpu_kms
 	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o amdgpu_lockdep.o \
 	amdgpu_ring_mux.o amdgpu_xcp.o amdgpu_seq64.o amdgpu_dev_coredump.o \
 	amdgpu_cper.o amdgpu_userq_fence.o amdgpu_eviction_fence.o amdgpu_ip.o \
-	amdgpu_wb.o amdgpu_cwsr.o amdgpu_events.o
+	amdgpu_wb.o amdgpu_cwsr.o amdgpu_events.o amdgpu_profiler.o
 
 amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 7c473f60bd28..a98c4a47e196 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -55,6 +55,7 @@
 #include "amdgpu_cwsr.h"
 #include "amdgpu_userq_fence.h"
 #include "../amdxcp/amdgpu_xcp_drv.h"
+#include "amdgpu_profiler.h"
 
 /*
  * KMS wrapper.
@@ -3096,6 +3097,7 @@ const struct drm_ioctl_desc amdgpu_ioctls_kms[] = {
 	DRM_IOCTL_DEF_DRV(AMDGPU_USERQ_WAIT, amdgpu_userq_wait_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(AMDGPU_GEM_LIST_HANDLES, amdgpu_gem_list_handles_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(AMDGPU_PROC_OPTIONS, amdgpu_proc_options_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(AMDGPU_PROFILER, amdgpu_profiler_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
 };
 
 static const struct drm_driver amdgpu_kms_driver = {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
new file mode 100644
index 000000000000..04902696adab
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/errno.h>
+#include <drm/amdgpu_drm.h>
+#include "amdgpu_profiler.h"
+
+int amdgpu_profiler_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
+{
+	struct drm_amdgpu_profiler_args *args = data;
+
+	switch (args->op) {
+	case AMDGPU_PROFILER_OP_VERSION:
+		args->version = AMDGPU_PROFILER_VERSION_NUM;
+		return 0;
+	case AMDGPU_PROFILER_OP_RESERVE:
+		return -EOPNOTSUPP;
+	case AMDGPU_PROFILER_OP_PMC:
+		return -EOPNOTSUPP;
+	default:
+		return -EINVAL;
+	}
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.h
new file mode 100644
index 000000000000..c27b5f9b3ff0
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_profiler.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright 2026 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __AMDGPU_PROFILER_H__
+#define __AMDGPU_PROFILER_H__
+
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+
+int amdgpu_profiler_ioctl(struct drm_device *dev, void *data, struct drm_file *filp);
+
+#endif /* __AMDGPU_PROFILER_H__ */
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 9222be9a6d2a..acc63804ba8c 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -60,6 +60,7 @@ extern "C" {
 #define DRM_AMDGPU_GEM_LIST_HANDLES	0x19
 #define DRM_AMDGPU_PROC_OPTIONS		0x1A
 #define DRM_AMDGPU_CWSR			0x1B
+#define DRM_AMDGPU_PROFILER		0x1C
 
 #define DRM_IOCTL_AMDGPU_GEM_CREATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_CREATE, union drm_amdgpu_gem_create)
 #define DRM_IOCTL_AMDGPU_GEM_MMAP	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_MMAP, union drm_amdgpu_gem_mmap)
@@ -83,6 +84,7 @@ extern "C" {
 #define DRM_IOCTL_AMDGPU_GEM_LIST_HANDLES DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_LIST_HANDLES, struct drm_amdgpu_gem_list_handles)
 #define DRM_IOCTL_AMDGPU_PROC_OPTIONS	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_PROC_OPTIONS, struct drm_amdgpu_proc_options)
 #define DRM_IOCTL_AMDGPU_CWSR	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_CWSR, union drm_amdgpu_cwsr)
+#define DRM_IOCTL_AMDGPU_PROFILER	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_PROFILER, struct drm_amdgpu_profiler_args)
 
 /**
  * DOC: memory domains
@@ -1809,6 +1811,40 @@ struct drm_amdgpu_proc_options {
 	} kfd_sigbus_delay;
 };
 
+#define AMDGPU_PROFILER_VERSION_NUM	1
+
+enum amdgpu_profiler_ops {
+	AMDGPU_PROFILER_OP_VERSION = 1,
+	AMDGPU_PROFILER_OP_RESERVE = 2,
+	AMDGPU_PROFILER_OP_PMC = 3,
+};
+
+enum amdgpu_profiler_reserve_ops {
+	/* release the device resertaion, only the reservation owner do this */
+	AMDGPU_PROFILER_RELEASE = 0,
+	/* reserve the device profiler */
+	AMDGPU_PROFILER_RESERVE = 1,
+	/* Clear the device profiler reservation, in case the reservation
+	 * owner can no longer release the reservation(e.g., it crashes),
+	 * This operation does not take the reseration nor touch profielr state
+	 */
+	AMDGPU_PROFILER_CLEAR_RESERVATION = 2,
+};
+
+struct drm_amdgpu_profiler_args {
+	/* enum amdgpu_profiler_ops */
+	__u8 op;
+	__u8 pad[3];
+	union {
+		/* AMDGPU_PROFILER_OP_RESERVE: enum amdgpu_profiler_reserve_ops */
+		__u8 reserve;
+		/* AMDGPU_PROFILER_OP_PMC: 1 enable PMC, 0 disable PMC */
+		__u8 perfcount_enable;
+		/* AMDGPU_PROFILER_OP_VERSION: AMDGPU_PROFILER_VERSION_NUM */
+		__u32 version;
+	};
+};
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.55.0