From c9dba58451c1bf718a62b171f3fda0fc661cb5a2 Mon Sep 17 00:00:00 2001
From: Christian Gmeiner <cgmeiner@igalia.com>
Date: Mon, 2 Dec 2024 15:06:13 +0100
Subject: [PATCH] drm/v3d: Add DRM_IOCTL_V3D_PERFMON_SET_GLOBAL
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Commit c6eabbab359c156669e10d5dec3e71e80ff09bd2 upstream

Add a new ioctl, DRM_IOCTL_V3D_PERFMON_SET_GLOBAL, to allow
configuration of a global performance monitor (perfmon).
Use the global perfmon for all jobs to ensure consistent
performance tracking across submissions. This feature is
needed to implement a Perfetto datasources in user-space.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241202140615.74802-1-christian.gmeiner@gmail.com
---
 drivers/gpu/drm/v3d/v3d_drv.c     |  1 +
 drivers/gpu/drm/v3d/v3d_drv.h     |  8 +++++++
 drivers/gpu/drm/v3d/v3d_perfmon.c | 37 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/v3d/v3d_sched.c   | 14 +++++++++---
 drivers/gpu/drm/v3d/v3d_submit.c  | 10 +++++++++
 include/uapi/drm/v3d_drm.h        | 18 +++++++++++++++
 6 files changed, 85 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -228,6 +228,7 @@ static const struct drm_ioctl_desc v3d_d
 	DRM_IOCTL_DEF_DRV(V3D_PERFMON_GET_VALUES, v3d_perfmon_get_values_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CPU, v3d_submit_cpu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 	DRM_IOCTL_DEF_DRV(V3D_PERFMON_GET_COUNTER, v3d_perfmon_get_counter_ioctl, DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(V3D_PERFMON_SET_GLOBAL, v3d_perfmon_set_global_ioctl, DRM_RENDER_ALLOW),
 };
 
 static const struct drm_driver v3d_drm_driver = {
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -197,6 +197,12 @@ struct v3d_dev {
 		u32 num_allocated;
 		u32 pages_allocated;
 	} bo_stats;
+
+	/* To support a performance analysis tool in user space, we require
+	 * a single, globally configured performance monitor (perfmon) for
+	 * all jobs.
+	 */
+	struct v3d_perfmon *global_perfmon;
 };
 
 static inline struct v3d_dev *
@@ -608,6 +614,8 @@ int v3d_perfmon_get_values_ioctl(struct
 				 struct drm_file *file_priv);
 int v3d_perfmon_get_counter_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file_priv);
+int v3d_perfmon_set_global_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv);
 
 /* v3d_sysfs.c */
 int v3d_sysfs_init(struct device *dev);
--- a/drivers/gpu/drm/v3d/v3d_perfmon.c
+++ b/drivers/gpu/drm/v3d/v3d_perfmon.c
@@ -313,6 +313,9 @@ static int v3d_perfmon_idr_del(int id, v
 	if (perfmon == v3d->active_perfmon)
 		v3d_perfmon_stop(v3d, perfmon, false);
 
+	/* If the global perfmon is being destroyed, set it to NULL */
+	cmpxchg(&v3d->global_perfmon, perfmon, NULL);
+
 	v3d_perfmon_put(perfmon);
 
 	return 0;
@@ -398,6 +401,9 @@ int v3d_perfmon_destroy_ioctl(struct drm
 	if (perfmon == v3d->active_perfmon)
 		v3d_perfmon_stop(v3d, perfmon, false);
 
+	/* If the global perfmon is being destroyed, set it to NULL */
+	cmpxchg(&v3d->global_perfmon, perfmon, NULL);
+
 	v3d_perfmon_put(perfmon);
 
 	return 0;
@@ -457,3 +463,34 @@ int v3d_perfmon_get_counter_ioctl(struct
 
 	return 0;
 }
+
+int v3d_perfmon_set_global_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv)
+{
+	struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
+	struct drm_v3d_perfmon_set_global *req = data;
+	struct v3d_dev *v3d = to_v3d_dev(dev);
+	struct v3d_perfmon *perfmon;
+
+	if (req->flags & ~DRM_V3D_PERFMON_CLEAR_GLOBAL)
+		return -EINVAL;
+
+	perfmon = v3d_perfmon_find(v3d_priv, req->id);
+	if (!perfmon)
+		return -EINVAL;
+
+	/* If the request is to clear the global performance monitor */
+	if (req->flags & DRM_V3D_PERFMON_CLEAR_GLOBAL) {
+		if (!v3d->global_perfmon)
+			return -EINVAL;
+
+		xchg(&v3d->global_perfmon, NULL);
+
+		return 0;
+	}
+
+	if (cmpxchg(&v3d->global_perfmon, NULL, perfmon))
+		return -EBUSY;
+
+	return 0;
+}
--- a/drivers/gpu/drm/v3d/v3d_sched.c
+++ b/drivers/gpu/drm/v3d/v3d_sched.c
@@ -120,11 +120,19 @@ v3d_cpu_job_free(struct drm_sched_job *s
 static void
 v3d_switch_perfmon(struct v3d_dev *v3d, struct v3d_job *job)
 {
-	if (job->perfmon != v3d->active_perfmon)
+	struct v3d_perfmon *perfmon = v3d->global_perfmon;
+
+	if (!perfmon)
+		perfmon = job->perfmon;
+
+	if (perfmon == v3d->active_perfmon)
+		return;
+
+	if (perfmon != v3d->active_perfmon)
 		v3d_perfmon_stop(v3d, v3d->active_perfmon, true);
 
-	if (job->perfmon && v3d->active_perfmon != job->perfmon)
-		v3d_perfmon_start(v3d, job->perfmon);
+	if (perfmon && v3d->active_perfmon != perfmon)
+		v3d_perfmon_start(v3d, perfmon);
 }
 
 static void
--- a/drivers/gpu/drm/v3d/v3d_submit.c
+++ b/drivers/gpu/drm/v3d/v3d_submit.c
@@ -1044,6 +1044,11 @@ v3d_submit_cl_ioctl(struct drm_device *d
 		goto fail;
 
 	if (args->perfmon_id) {
+		if (v3d->global_perfmon) {
+			ret = -EAGAIN;
+			goto fail_perfmon;
+		}
+
 		render->base.perfmon = v3d_perfmon_find(v3d_priv,
 							args->perfmon_id);
 
@@ -1259,6 +1264,11 @@ v3d_submit_csd_ioctl(struct drm_device *
 		goto fail;
 
 	if (args->perfmon_id) {
+		if (v3d->global_perfmon) {
+			ret = -EAGAIN;
+			goto fail_perfmon;
+		}
+
 		job->base.perfmon = v3d_perfmon_find(v3d_priv,
 						     args->perfmon_id);
 		if (!job->base.perfmon) {
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -43,6 +43,7 @@ extern "C" {
 #define DRM_V3D_PERFMON_GET_VALUES                0x0a
 #define DRM_V3D_SUBMIT_CPU                        0x0b
 #define DRM_V3D_PERFMON_GET_COUNTER               0x0c
+#define DRM_V3D_PERFMON_SET_GLOBAL                0x0d
 
 #define DRM_IOCTL_V3D_SUBMIT_CL           DRM_IOWR(DRM_COMMAND_BASE + DRM_V3D_SUBMIT_CL, struct drm_v3d_submit_cl)
 #define DRM_IOCTL_V3D_WAIT_BO             DRM_IOWR(DRM_COMMAND_BASE + DRM_V3D_WAIT_BO, struct drm_v3d_wait_bo)
@@ -61,6 +62,8 @@ extern "C" {
 #define DRM_IOCTL_V3D_SUBMIT_CPU          DRM_IOW(DRM_COMMAND_BASE + DRM_V3D_SUBMIT_CPU, struct drm_v3d_submit_cpu)
 #define DRM_IOCTL_V3D_PERFMON_GET_COUNTER DRM_IOWR(DRM_COMMAND_BASE + DRM_V3D_PERFMON_GET_COUNTER, \
 						   struct drm_v3d_perfmon_get_counter)
+#define DRM_IOCTL_V3D_PERFMON_SET_GLOBAL  DRM_IOW(DRM_COMMAND_BASE + DRM_V3D_PERFMON_SET_GLOBAL, \
+						   struct drm_v3d_perfmon_set_global)
 
 #define DRM_V3D_SUBMIT_CL_FLUSH_CACHE             0x01
 #define DRM_V3D_SUBMIT_EXTENSION		  0x02
@@ -766,6 +769,21 @@ struct drm_v3d_perfmon_get_counter {
 	__u8 reserved[7];
 };
 
+#define DRM_V3D_PERFMON_CLEAR_GLOBAL    0x0001
+
+/**
+ * struct drm_v3d_perfmon_set_global - ioctl to define a global performance
+ * monitor
+ *
+ * The global performance monitor will be used for all jobs. If a global
+ * performance monitor is defined, jobs with a self-defined performance
+ * monitor won't be allowed.
+ */
+struct drm_v3d_perfmon_set_global {
+	__u32 flags;
+	__u32 id;
+};
+
 #if defined(__cplusplus)
 }
 #endif
