[RFC 1/7] drm/amdgpu: UAPI for user queue management

[Shashank Sharma]

From: Alex Deucher <alexander.deucher at amd.com>

This patch intorduces new UAPI/IOCTL for usermode graphics
queue. The userspace app will fill this structure and request
the graphics driver to add a graphics work queue for it. The
output of this UAPI is a queue id.

This UAPI maps the queue into GPU, so the graphics app can start
submitting work to the queue as soon as the call returns.

Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian Koenig <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
---
 include/uapi/drm/amdgpu_drm.h | 52 +++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 0d93ec132ebb..a3d0dd6f62c5 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -54,6 +54,7 @@ extern "C" {
 #define DRM_AMDGPU_VM			0x13
 #define DRM_AMDGPU_FENCE_TO_HANDLE	0x14
 #define DRM_AMDGPU_SCHED		0x15
+#define DRM_AMDGPU_USERQ		0x16
 
 #define DRM_IOCTL_AMDGPU_GEM_CREATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_CREATE, union drm_amdgpu_gem_create)
 #define DRM_IOCTL_AMDGPU_GEM_MMAP	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_MMAP, union drm_amdgpu_gem_mmap)
@@ -71,6 +72,7 @@ extern "C" {
 #define DRM_IOCTL_AMDGPU_VM		DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_VM, union drm_amdgpu_vm)
 #define DRM_IOCTL_AMDGPU_FENCE_TO_HANDLE DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_FENCE_TO_HANDLE, union drm_amdgpu_fence_to_handle)
 #define DRM_IOCTL_AMDGPU_SCHED		DRM_IOW(DRM_COMMAND_BASE + DRM_AMDGPU_SCHED, union drm_amdgpu_sched)
+#define DRM_IOCTL_AMDGPU_USERQ		DRM_IOW(DRM_COMMAND_BASE + DRM_AMDGPU_USERQ, union drm_amdgpu_userq)
 
 /**
  * DOC: memory domains
@@ -288,6 +290,56 @@ union drm_amdgpu_ctx {
 	union drm_amdgpu_ctx_out out;
 };
 
+/* user queue IOCTL */
+#define AMDGPU_USERQ_OP_CREATE	1
+#define AMDGPU_USERQ_OP_FREE	2
+
+#define AMDGPU_USERQ_MQD_FLAGS_SECURE	(1 << 0)
+#define AMDGPU_USERQ_MQD_FLAGS_AQL	(1 << 1)
+
+struct drm_amdgpu_userq_mqd {
+	/** Flags: AMDGPU_USERQ_MQD_FLAGS_* */
+	__u32	flags;
+	/** IP type: AMDGPU_HW_IP_* */
+	__u32	ip_type;
+	/** GEM object handle */
+	__u32   doorbell_handle;
+	/** Doorbell offset in dwords */
+	__u32   doorbell_offset;
+	/** GPU virtual address of the queue */
+	__u64   queue_va;
+	/** Size of the queue in bytes */
+	__u64   queue_size;
+	/** GPU virtual address of the rptr */
+	__u64   rptr_va;
+	/** GPU virtual address of the wptr */
+	__u64   wptr_va;
+};
+
+struct drm_amdgpu_userq_in {
+	/** AMDGPU_USERQ_OP_* */
+	__u32	op;
+	/** Flags */
+	__u32	flags;
+	/** Context handle to associate the queue with */
+	__u32	ctx_id;
+	__u32	pad;
+	/** Queue descriptor */
+	struct drm_amdgpu_userq_mqd mqd;
+};
+
+struct drm_amdgpu_userq_out {
+	/** Queue handle */
+	__u32	q_id;
+	/** Flags */
+	__u32	flags;
+};
+
+union drm_amdgpu_userq {
+	struct drm_amdgpu_userq_in in;
+	struct drm_amdgpu_userq_out out;
+};
+
 /* vm ioctl */
 #define AMDGPU_VM_OP_RESERVE_VMID	1
 #define AMDGPU_VM_OP_UNRESERVE_VMID	2
-- 
2.34.1