Hi Christian,
Thanks for your patch! Just some small nits.
On 31/10/24 17:51, Christian Gmeiner wrote:
From: Christian Gmeiner <cgmeiner@xxxxxxxxxx>
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.
I'd mention how this feature can be useful for user-space (for example,
the implementation of a Perfetto datasource).
Signed-off-by: Christian Gmeiner <cgmeiner@xxxxxxxxxx>
---
Changes in v2:
- Reworked commit message.
- Removed num_perfmon counter for tracking perfmon allocations.
- Allowing allocation of perfmons when the global perfmon is active.
- Return -EAGAIN for submissions with a per job perfmon if the global perfmon is active.
---
drivers/gpu/drm/v3d/v3d_drv.c | 1 +
drivers/gpu/drm/v3d/v3d_drv.h | 8 ++++++++
drivers/gpu/drm/v3d/v3d_perfmon.c | 34 +++++++++++++++++++++++++++++++
drivers/gpu/drm/v3d/v3d_sched.c | 14 ++++++++++---
drivers/gpu/drm/v3d/v3d_submit.c | 10 +++++++++
include/uapi/drm/v3d_drm.h | 15 ++++++++++++++
6 files changed, 79 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index d7ff1f5fa481..3c89f0daa5b8 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -214,6 +214,7 @@ static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
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 = {
diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index cf4b23369dc4..a0d920ec2b1d 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -179,6 +179,12 @@ 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 *
@@ -584,6 +590,8 @@ int v3d_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
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);
diff --git a/drivers/gpu/drm/v3d/v3d_perfmon.c b/drivers/gpu/drm/v3d/v3d_perfmon.c
index 156be13ab2ef..bf42303c292b 100644
--- a/drivers/gpu/drm/v3d/v3d_perfmon.c
+++ b/drivers/gpu/drm/v3d/v3d_perfmon.c
@@ -312,6 +312,9 @@ static int v3d_perfmon_idr_del(int id, void *elem, void *data)
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;
@@ -451,3 +454,34 @@ int v3d_perfmon_get_counter_ioctl(struct drm_device *dev, void *data,
return 0;
}
[...]
index 87fc5bb0a61e..709724fe28e6 100644
--- 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
@@ -765,6 +768,18 @@ struct drm_v3d_perfmon_get_counter {
__u8 reserved[7];
};
+#define DRM_V3D_PERFMON_CLEAR_GLOBAL 0x0001
+
+/*
Please, use kernel-doc [1]. So, here is /**
[1] https://docs.kernel.org/doc-guide/kernel-doc.html
+ * struct drm_v3d_perfmon_set_global - ioctl to define a
The colunm width is 80.
+ * global performance counter that is used if a job has
s/counter/monitor
+ * not assigned one on its own.
This description isn't really precise. When the global performance
monitor is enabled, the job perfmon doesn't matter. Currently, we don't
even allow a job perfmon to be submitted, but if we did, the global
perfmon would be used even if the job had a perfmon.
Best Regards,
- Maíra
+ */
+struct drm_v3d_perfmon_set_global {
+ __u32 flags;
+ __u32 id;
+};
+
#if defined(__cplusplus)
}
#endif
