Introduce two new UAPI ioctls to allow userspace to bind and unbind
an eventfd to a userspace-defined event_id on the render node.
DRM_AMDGPU_EVENTFD_BIND
DRM_AMDGPU_EVENTFD_UNBIND
The bind ioctl associates an eventfd file descriptor with an event_id
within the context of a drm_file (i.e., per-process / per-PASID).
When a matching interrupt or driver event occurs, the kernel can
signal the corresponding eventfd, allowing userspace to use poll/epoll
for event notification.
The unbind ioctl removes the association.
Cc: Harish Kasiviswanathan <[email protected]>
Cc: Felix Kuehling <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Christian König <[email protected]>
Signed-off-by: Srinivasan Shanmugam <[email protected]>
Change-Id: I02faa7404c10c40d74c9aa2d4a367c226b8b23fd
---
include/uapi/drm/amdgpu_drm.h | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 33e8738ce91f..4b367352bebb 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -39,6 +39,8 @@ extern "C" {
#endif
#define DRM_AMDGPU_GEM_CREATE 0x00
+#define DRM_AMDGPU_EVENTFD_BIND 0x1A /* render-node eventfd
bind */
+#define DRM_AMDGPU_EVENTFD_UNBIND 0x1B /* render-node eventfd unbind */
#define DRM_AMDGPU_GEM_MMAP 0x01
#define DRM_AMDGPU_CTX 0x02
#define DRM_AMDGPU_BO_LIST 0x03
@@ -79,7 +81,12 @@ extern "C" {
#define DRM_IOCTL_AMDGPU_USERQ_SIGNAL DRM_IOWR(DRM_COMMAND_BASE +
DRM_AMDGPU_USERQ_SIGNAL, struct drm_amdgpu_userq_signal)
#define DRM_IOCTL_AMDGPU_USERQ_WAIT DRM_IOWR(DRM_COMMAND_BASE +
DRM_AMDGPU_USERQ_WAIT, struct drm_amdgpu_userq_wait)
#define DRM_IOCTL_AMDGPU_GEM_LIST_HANDLES DRM_IOWR(DRM_COMMAND_BASE +
DRM_AMDGPU_GEM_LIST_HANDLES, struct drm_amdgpu_gem_list_handles)
-
+#define DRM_IOCTL_AMDGPU_EVENTFD_BIND \
+ DRM_IOW(DRM_COMMAND_BASE + DRM_AMDGPU_EVENTFD_BIND, \
+ struct drm_amdgpu_eventfd_bind)
+#define DRM_IOCTL_AMDGPU_EVENTFD_UNBIND \
+ DRM_IOW(DRM_COMMAND_BASE + DRM_AMDGPU_EVENTFD_UNBIND, \
+ struct drm_amdgpu_eventfd_unbind)
/**
* DOC: memory domains
*
@@ -204,6 +211,32 @@ union drm_amdgpu_gem_create {
struct drm_amdgpu_gem_create_out out;
};
+/**
+ * struct drm_amdgpu_eventfd_bind - bind an eventfd to an event_id
+ * @event_id: userspace-defined event id (e.g., HSA signal event id)
+ * @eventfd: userspace eventfd file descriptor to signal
+ * @flags: reserved for future use, must be 0
+ *
+ * Semantics:
+ * - bind is per drm_file (per process / per PASID context)
+ * - multiple GPUs: userspace repeats bind on each render node
+ */
+struct drm_amdgpu_eventfd_bind {
+ __u32 event_id;
+ __s32 eventfd;
+ __u32 flags;
+};
+
+/**
+ * struct drm_amdgpu_eventfd_unbind - unbind an eventfd from an event_id
+ * @event_id: event id to unbind
+ * @flags: reserved for future use, must be 0
+ */
+struct drm_amdgpu_eventfd_unbind {
+ __u32 event_id;
+ __u32 flags;
+};
+
/** Opcode to create new residency list. */
#define AMDGPU_BO_LIST_OP_CREATE 0
/** Opcode to destroy previously created residency list */
--
2.34.1
