drm/panfrost: Introduce uAPI for JM context creation

The new uAPI lets user space query the KM driver for the available
priorities a job can be given at submit time. These are managed through
the notion of a context, for which we also provide new creation and
destruction ioctls.

Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250917191859.500279-2-adrian.larumbe@collabora.com

diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h
index ed67510395bd064bebc3727ff5c043fcbc1a641c..e8b47c9f6976ccecf274c942933db833b6367324 100644 (file)
--- a/include/uapi/drm/panfrost_drm.h
+++ b/include/uapi/drm/panfrost_drm.h
@@ -22,6 +22,8 @@ extern "C" {
 #define DRM_PANFROST_PERFCNT_DUMP              0x07
 #define DRM_PANFROST_MADVISE                   0x08
 #define DRM_PANFROST_SET_LABEL_BO              0x09
+#define DRM_PANFROST_JM_CTX_CREATE             0x0a
+#define DRM_PANFROST_JM_CTX_DESTROY            0x0b
 
 #define DRM_IOCTL_PANFROST_SUBMIT              DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_SUBMIT, struct drm_panfrost_submit)
 #define DRM_IOCTL_PANFROST_WAIT_BO             DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_WAIT_BO, struct drm_panfrost_wait_bo)
@@ -31,6 +33,8 @@ extern "C" {
 #define DRM_IOCTL_PANFROST_GET_BO_OFFSET       DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_GET_BO_OFFSET, struct drm_panfrost_get_bo_offset)
 #define DRM_IOCTL_PANFROST_MADVISE             DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_MADVISE, struct drm_panfrost_madvise)
 #define DRM_IOCTL_PANFROST_SET_LABEL_BO                DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_SET_LABEL_BO, struct drm_panfrost_set_label_bo)
+#define DRM_IOCTL_PANFROST_JM_CTX_CREATE       DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_JM_CTX_CREATE, struct drm_panfrost_jm_ctx_create)
+#define DRM_IOCTL_PANFROST_JM_CTX_DESTROY      DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_JM_CTX_DESTROY, struct drm_panfrost_jm_ctx_destroy)
 
 /*
  * Unstable ioctl(s): only exposed when the unsafe unstable_ioctls module
@@ -71,6 +75,12 @@ struct drm_panfrost_submit {
 
        /** A combination of PANFROST_JD_REQ_* */
        __u32 requirements;
+
+       /** JM context handle. Zero if you want to use the default context. */
+       __u32 jm_ctx_handle;
+
+       /** Padding field. MBZ. */
+       __u32 pad;
 };
 
 /**
@@ -177,6 +187,7 @@ enum drm_panfrost_param {
        DRM_PANFROST_PARAM_AFBC_FEATURES,
        DRM_PANFROST_PARAM_SYSTEM_TIMESTAMP,
        DRM_PANFROST_PARAM_SYSTEM_TIMESTAMP_FREQUENCY,
+       DRM_PANFROST_PARAM_ALLOWED_JM_CTX_PRIORITIES,
 };
 
 struct drm_panfrost_get_param {
@@ -299,6 +310,45 @@ struct panfrost_dump_registers {
        __u32 value;
 };
 
+enum drm_panfrost_jm_ctx_priority {
+       /**
+        * @PANFROST_JM_CTX_PRIORITY_LOW: Low priority context.
+        */
+       PANFROST_JM_CTX_PRIORITY_LOW = 0,
+
+       /**
+        * @PANFROST_JM_CTX_PRIORITY_MEDIUM: Medium priority context.
+        */
+       PANFROST_JM_CTX_PRIORITY_MEDIUM,
+
+       /**
+        * @PANFROST_JM_CTX_PRIORITY_HIGH: High priority context.
+        *
+        * Requires CAP_SYS_NICE or DRM_MASTER.
+        */
+       PANFROST_JM_CTX_PRIORITY_HIGH,
+};
+
+struct drm_panfrost_jm_ctx_create {
+       /** @handle: Handle of the created JM context */
+       __u32 handle;
+
+       /** @priority: Context priority (see enum drm_panfrost_jm_ctx_priority). */
+       __u32 priority;
+};
+
+struct drm_panfrost_jm_ctx_destroy {
+       /**
+        * @handle: Handle of the JM context to destroy.
+        *
+        * Must be a valid context handle returned by DRM_IOCTL_PANTHOR_JM_CTX_CREATE.
+        */
+       __u32 handle;
+
+       /** @pad: Padding field, MBZ. */
+       __u32 pad;
+};
+
 #if defined(__cplusplus)
 }
 #endif