[PATCH v2 2/2] drm/panthor: Add DEV_QUERY_GROUP_PRIORITIES_INFO dev query
From: Mary Guillemard
Date: Thu Sep 05 2024 - 13:36:08 EST
Expose allowed group priorities with a new device query.
This new uAPI will be used in Mesa to properly report what priorities a
user can use for EGL_IMG_context_priority.
Since this extends the uAPI and because userland needs a way to
advertise priorities accordingly, this also bumps the driver minor
version.
v2:
- Remove drm_panthor_group_allow_priority_flags definition
- Document that allowed_mask is a bitmask of drm_panthor_group_priority
Signed-off-by: Mary Guillemard <mary.guillemard@xxxxxxxxxxxxx>
---
drivers/gpu/drm/panthor/panthor_drv.c | 61 ++++++++++++++++++---------
include/uapi/drm/panthor_drm.h | 22 ++++++++++
2 files changed, 64 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
index 7b1db2adcb4c..f85aa2d99f09 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -170,6 +170,7 @@ panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
PANTHOR_UOBJ_DECL(struct drm_panthor_gpu_info, tiler_present), \
PANTHOR_UOBJ_DECL(struct drm_panthor_csif_info, pad), \
PANTHOR_UOBJ_DECL(struct drm_panthor_timestamp_info, current_timestamp), \
+ PANTHOR_UOBJ_DECL(struct drm_panthor_group_priorities_info, pad), \
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), \
@@ -777,11 +778,41 @@ static int panthor_query_timestamp_info(struct panthor_device *ptdev,
return 0;
}
+static int group_priority_permit(struct drm_file *file,
+ u8 priority)
+{
+ /* Ensure that priority is valid */
+ if (priority > PANTHOR_GROUP_PRIORITY_REALTIME)
+ return -EINVAL;
+
+ /* Medium priority and below are always allowed */
+ if (priority <= PANTHOR_GROUP_PRIORITY_MEDIUM)
+ return 0;
+
+ /* Higher priorities require CAP_SYS_NICE or DRM_MASTER */
+ if (capable(CAP_SYS_NICE) || drm_is_current_master(file))
+ return 0;
+
+ return -EACCES;
+}
+
+static void panthor_query_group_priorities_info(struct drm_file *file,
+ struct drm_panthor_group_priorities_info *arg)
+{
+ int prio;
+
+ for (prio = PANTHOR_GROUP_PRIORITY_REALTIME; prio >= 0; prio--) {
+ if (!group_priority_permit(file, prio))
+ arg->allowed_mask |= 1 << prio;
+ }
+}
+
static int panthor_ioctl_dev_query(struct drm_device *ddev, void *data, struct drm_file *file)
{
struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base);
struct drm_panthor_dev_query *args = data;
struct drm_panthor_timestamp_info timestamp_info;
+ struct drm_panthor_group_priorities_info priorities_info;
int ret;
if (!args->pointer) {
@@ -798,6 +829,10 @@ static int panthor_ioctl_dev_query(struct drm_device *ddev, void *data, struct d
args->size = sizeof(timestamp_info);
return 0;
+ case DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO:
+ args->size = sizeof(priorities_info);
+ return 0;
+
default:
return -EINVAL;
}
@@ -818,6 +853,10 @@ static int panthor_ioctl_dev_query(struct drm_device *ddev, void *data, struct d
return PANTHOR_UOBJ_SET(args->pointer, args->size, timestamp_info);
+ case DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO:
+ panthor_query_group_priorities_info(file, &priorities_info);
+ return PANTHOR_UOBJ_SET(args->pointer, args->size, priorities_info);
+
default:
return -EINVAL;
}
@@ -1037,24 +1076,6 @@ static int panthor_ioctl_group_destroy(struct drm_device *ddev, void *data,
return panthor_group_destroy(pfile, args->group_handle);
}
-static int group_priority_permit(struct drm_file *file,
- u8 priority)
-{
- /* Ensure that priority is valid */
- if (priority > PANTHOR_GROUP_PRIORITY_REALTIME)
- return -EINVAL;
-
- /* Medium priority and below are always allowed */
- if (priority <= PANTHOR_GROUP_PRIORITY_MEDIUM)
- return 0;
-
- /* Higher priorities require CAP_SYS_NICE or DRM_MASTER */
- if (capable(CAP_SYS_NICE) || drm_is_current_master(file))
- return 0;
-
- return -EACCES;
-}
-
static int panthor_ioctl_group_create(struct drm_device *ddev, void *data,
struct drm_file *file)
{
@@ -1436,6 +1457,8 @@ static void panthor_debugfs_init(struct drm_minor *minor)
* PanCSF driver version:
* - 1.0 - initial interface
* - 1.1 - adds DEV_QUERY_TIMESTAMP_INFO query
+ * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query
+ * - adds PANTHOR_GROUP_PRIORITY_REALTIME priority
*/
static const struct drm_driver panthor_drm_driver = {
.driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ |
@@ -1449,7 +1472,7 @@ static const struct drm_driver panthor_drm_driver = {
.desc = "Panthor DRM driver",
.date = "20230801",
.major = 1,
- .minor = 1,
+ .minor = 2,
.gem_create_object = panthor_gem_create_object,
.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,
diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
index 011a555e4674..87c9cb555dd1 100644
--- a/include/uapi/drm/panthor_drm.h
+++ b/include/uapi/drm/panthor_drm.h
@@ -263,6 +263,11 @@ enum drm_panthor_dev_query_type {
/** @DRM_PANTHOR_DEV_QUERY_TIMESTAMP_INFO: Query timestamp information. */
DRM_PANTHOR_DEV_QUERY_TIMESTAMP_INFO,
+
+ /**
+ * @DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO: Query allowed group priorities information.
+ */
+ DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO,
};
/**
@@ -399,6 +404,23 @@ struct drm_panthor_timestamp_info {
__u64 timestamp_offset;
};
+/**
+ * struct drm_panthor_group_priorities_info - Group priorities information
+ *
+ * Structure grouping all queryable information relating to the allowed group priorities.
+ */
+struct drm_panthor_group_priorities_info {
+ /**
+ * @allowed_mask: Bitmask of the allowed group priorities.
+ *
+ * Each bit represents a variant of the enum drm_panthor_group_priority.
+ */
+ __u8 allowed_mask;
+
+ /** @pad: Padding fields, MBZ. */
+ __u8 pad[3];
+};
+
/**
* struct drm_panthor_dev_query - Arguments passed to DRM_PANTHOR_IOCTL_DEV_QUERY
*/
--
2.46.0