[v3,7/7] drm/panthor: Expose the panthor perf ioctls

Commit Message

Lukas Zapolskas April 1, 2025, 3:48 p.m. UTC

This patch implements the PANTHOR_PERF_CONTROL ioctl series, and
a PANTHOR_GET_UOBJ wrapper to deal with the backwards and forwards
compatibility of the uAPI.

The minor version is bumped to indicate that the feature is now
supported.

Signed-off-by: Lukas Zapolskas <[e-mail]>
Reviewed-by: Adrián Larumbe <[e-mail]>
---
 drivers/gpu/drm/panthor/panthor_drv.c | 141 +++++++++++++++++++++++++-
 1 file changed, 139 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
index 4c1381320859..850a894fe91b 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -31,6 +31,7 @@ 
 #include "panthor_gpu.h"
 #include "panthor_heap.h"
 #include "panthor_mmu.h"
+#include "panthor_perf.h"
 #include "panthor_regs.h"
 #include "panthor_sched.h"
 
@@ -73,6 +74,39 @@  panthor_set_uobj(u64 usr_ptr, u32 usr_size, u32 min_size, u32 kern_size, const v
 	return 0;
 }
 
+/**
+ * panthor_get_uobj() - Copy kernel object to user object.
+ * @usr_ptr: Users pointer.
+ * @usr_size: Size of the user object.
+ * @min_size: Minimum size for this object.
+ *
+ * Helper automating kernel -> user object copies.
+ *
+ * Don't use this function directly, use PANTHOR_UOBJ_GET() instead.
+ *
+ * Return: valid pointer on success, an encoded error code otherwise.
+ */
+static void*
+panthor_get_uobj(u64 usr_ptr, u32 usr_size, u32 min_size)
+{
+	int ret;
+	void *out_alloc __free(kvfree) = NULL;
+
+	/* User size shouldn't be smaller than the minimal object size. */
+	if (usr_size < min_size)
+		return ERR_PTR(-EINVAL);
+
+	out_alloc = kvmalloc(min_size, GFP_KERNEL);
+	if (!out_alloc)
+		return ERR_PTR(-ENOMEM);
+
+	ret = copy_struct_from_user(out_alloc, min_size, u64_to_user_ptr(usr_ptr), usr_size);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return_ptr(out_alloc);
+}
+
 /**
  * panthor_get_uobj_array() - Copy a user object array into a kernel accessible object array.
  * @in: The object array to copy.
@@ -176,7 +210,12 @@  panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
 		 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_perf_info, shader_blocks))
+		 PANTHOR_UOBJ_DECL(struct drm_panthor_perf_info, shader_blocks), \
+		 PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_setup, shader_enable_mask), \
+		 PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_start, user_data), \
+		 PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_stop, user_data), \
+		 PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_sample, user_data))
+
 
 /**
  * PANTHOR_UOBJ_SET() - Copy a kernel object to a user object.
@@ -191,6 +230,24 @@  panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
 			 PANTHOR_UOBJ_MIN_SIZE(_src_obj), \
 			 sizeof(_src_obj), &(_src_obj))
 
+/**
+ * PANTHOR_UOBJ_GET() - Copies a user object from _usr_ptr to a kernel accessible _dest_ptr.
+ * @_dest_ptr: Local variable
+ * @_usr_size: Size of the user object.
+ * @_usr_ptr: The pointer of the object in userspace.
+ *
+ * Return: Error code. See panthor_get_uobj().
+ */
+#define PANTHOR_UOBJ_GET(_dest_ptr, _usr_size, _usr_ptr) \
+	({ \
+		typeof(_dest_ptr) _tmp; \
+		_tmp = panthor_get_uobj(_usr_ptr, _usr_size, \
+				PANTHOR_UOBJ_MIN_SIZE(_tmp[0])); \
+		if (!IS_ERR(_tmp)) \
+			_dest_ptr = _tmp; \
+		PTR_ERR_OR_ZERO(_tmp); \
+	})
+
 /**
  * PANTHOR_UOBJ_GET_ARRAY() - Copy a user object array to a kernel accessible
  * object array.
@@ -1339,6 +1396,83 @@  static int panthor_ioctl_vm_get_state(struct drm_device *ddev, void *data,
 	return 0;
 }
 
+#define perf_cmd(command) \
+	({ \
+		struct drm_panthor_perf_cmd_##command *command##_args __free(kvfree) = NULL; \
+		int _ret = PANTHOR_UOBJ_GET(command##_args, args->size, args->pointer); \
+		if (_ret) \
+			return _ret; \
+		return panthor_perf_session_##command(pfile, ptdev->perf, args->handle, \
+				command##_args->user_data); \
+	})
+
+static int panthor_ioctl_perf_control(struct drm_device *ddev, void *data,
+				      struct drm_file *file)
+{
+	struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base);
+	struct panthor_file *pfile = file->driver_priv;
+	struct drm_panthor_perf_control *args = data;
+	int ret;
+
+	if (!args->pointer) {
+		switch (args->cmd) {
+		case DRM_PANTHOR_PERF_COMMAND_SETUP:
+			args->size = sizeof(struct drm_panthor_perf_cmd_setup);
+			return 0;
+
+		case DRM_PANTHOR_PERF_COMMAND_TEARDOWN:
+			args->size = 0;
+			return 0;
+
+		case DRM_PANTHOR_PERF_COMMAND_START:
+			args->size = sizeof(struct drm_panthor_perf_cmd_start);
+			return 0;
+
+		case DRM_PANTHOR_PERF_COMMAND_STOP:
+			args->size = sizeof(struct drm_panthor_perf_cmd_stop);
+			return 0;
+
+		case DRM_PANTHOR_PERF_COMMAND_SAMPLE:
+			args->size = sizeof(struct drm_panthor_perf_cmd_sample);
+			return 0;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	switch (args->cmd) {
+	case DRM_PANTHOR_PERF_COMMAND_SETUP:
+	{
+		struct drm_panthor_perf_cmd_setup *setup_args __free(kvfree) = NULL;
+
+		ret = PANTHOR_UOBJ_GET(setup_args, args->size, args->pointer);
+		if (ret)
+			return -EINVAL;
+
+		return panthor_perf_session_setup(ptdev, ptdev->perf, setup_args, pfile);
+	}
+	case DRM_PANTHOR_PERF_COMMAND_TEARDOWN:
+	{
+		return panthor_perf_session_teardown(pfile, ptdev->perf, args->handle);
+	}
+	case DRM_PANTHOR_PERF_COMMAND_START:
+	{
+		perf_cmd(start);
+	}
+	case DRM_PANTHOR_PERF_COMMAND_STOP:
+	{
+		perf_cmd(stop);
+	}
+	case DRM_PANTHOR_PERF_COMMAND_SAMPLE:
+	{
+		perf_cmd(sample);
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
 static int
 panthor_open(struct drm_device *ddev, struct drm_file *file)
 {
@@ -1409,6 +1543,7 @@  static const struct drm_ioctl_desc panthor_drm_driver_ioctls[] = {
 	PANTHOR_IOCTL(TILER_HEAP_CREATE, tiler_heap_create, DRM_RENDER_ALLOW),
 	PANTHOR_IOCTL(TILER_HEAP_DESTROY, tiler_heap_destroy, DRM_RENDER_ALLOW),
 	PANTHOR_IOCTL(GROUP_SUBMIT, group_submit, DRM_RENDER_ALLOW),
+	PANTHOR_IOCTL(PERF_CONTROL, perf_control, DRM_RENDER_ALLOW),
 };
 
 static int panthor_mmap(struct file *filp, struct vm_area_struct *vma)
@@ -1518,6 +1653,8 @@  static void panthor_debugfs_init(struct drm_minor *minor)
  * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query
  *       - adds PANTHOR_GROUP_PRIORITY_REALTIME priority
  * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag
+ * - 1.4 - adds DEV_QUERY_PERF_INFO query
+ *       - adds PERF_CONTROL ioctl
  */
 static const struct drm_driver panthor_drm_driver = {
 	.driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ |
@@ -1531,7 +1668,7 @@  static const struct drm_driver panthor_drm_driver = {
 	.name = "panthor",
 	.desc = "Panthor DRM driver",
 	.major = 1,
-	.minor = 3,
+	.minor = 4,
 
 	.gem_create_object = panthor_gem_create_object,
 	.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,