drm/nouveau: implement new VM_BIND uAPI

This commit provides the implementation for the new uapi motivated by the
Vulkan API. It allows user mode drivers (UMDs) to:

1) Initialize a GPU virtual address (VA) space via the new
   DRM_IOCTL_NOUVEAU_VM_INIT ioctl for UMDs to specify the portion of VA
   space managed by the kernel and userspace, respectively.

2) Allocate and free a VA space region as well as bind and unbind memory
   to the GPUs VA space via the new DRM_IOCTL_NOUVEAU_VM_BIND ioctl.
   UMDs can request the named operations to be processed either
   synchronously or asynchronously. It supports DRM syncobjs
   (incl. timelines) as synchronization mechanism. The management of the
   GPU VA mappings is implemented with the DRM GPU VA manager.

3) Execute push buffers with the new DRM_IOCTL_NOUVEAU_EXEC ioctl. The
   execution happens asynchronously. It supports DRM syncobj (incl.
   timelines) as synchronization mechanism. DRM GEM object locking is
   handled with drm_exec.

Both, DRM_IOCTL_NOUVEAU_VM_BIND and DRM_IOCTL_NOUVEAU_EXEC, use the DRM
GPU scheduler for the asynchronous paths.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804182406.5222-12-dakr@redhat.com

1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_uvmm.h b/drivers/gpu/drm/nouveau/nouveau_uvmm.h
new file mode 100644
index 000000000000..3923c03012f9
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_uvmm.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef __NOUVEAU_UVMM_H__
+#define __NOUVEAU_UVMM_H__
+
+#include <drm/drm_gpuva_mgr.h>
+
+#include "nouveau_drv.h"
+
+struct nouveau_uvmm {
+	struct nouveau_vmm vmm;
+	struct drm_gpuva_manager umgr;
+	struct maple_tree region_mt;
+	struct mutex mutex;
+	struct dma_resv resv;
+
+	u64 kernel_managed_addr;
+	u64 kernel_managed_size;
+
+	bool disabled;
+};
+
+struct nouveau_uvma_region {
+	struct nouveau_uvmm *uvmm;
+
+	struct {
+		u64 addr;
+		u64 range;
+	} va;
+
+	struct kref kref;
+
+	struct completion complete;
+	bool dirty;
+};
+
+struct nouveau_uvma {
+	struct drm_gpuva va;
+
+	struct nouveau_uvmm *uvmm;
+	struct nouveau_uvma_region *region;
+
+	u8 kind;
+};
+
+struct nouveau_uvmm_bind_job {
+	struct nouveau_job base;
+
+	struct kref kref;
+	struct list_head entry;
+	struct work_struct work;
+	struct completion complete;
+
+	/* struct bind_job_op */
+	struct list_head ops;
+};
+
+struct nouveau_uvmm_bind_job_args {
+	struct drm_file *file_priv;
+	struct nouveau_sched_entity *sched_entity;
+
+	unsigned int flags;
+
+	struct {
+		struct drm_nouveau_sync *s;
+		u32 count;
+	} in_sync;
+
+	struct {
+		struct drm_nouveau_sync *s;
+		u32 count;
+	} out_sync;
+
+	struct {
+		struct drm_nouveau_vm_bind_op *s;
+		u32 count;
+	} op;
+};
+
+#define to_uvmm_bind_job(job) container_of((job), struct nouveau_uvmm_bind_job, base)
+
+#define uvmm_from_mgr(x) container_of((x), struct nouveau_uvmm, umgr)
+#define uvma_from_va(x) container_of((x), struct nouveau_uvma, va)
+
+int nouveau_uvmm_init(struct nouveau_uvmm *uvmm, struct nouveau_cli *cli,
+		      u64 kernel_managed_addr, u64 kernel_managed_size);
+void nouveau_uvmm_fini(struct nouveau_uvmm *uvmm);
+
+void nouveau_uvmm_bo_map_all(struct nouveau_bo *nvbov, struct nouveau_mem *mem);
+void nouveau_uvmm_bo_unmap_all(struct nouveau_bo *nvbo);
+
+int nouveau_uvmm_ioctl_vm_init(struct drm_device *dev, void __user *data,
+			       struct drm_file *file_priv);
+
+int nouveau_uvmm_ioctl_vm_bind(struct drm_device *dev, void __user *data,
+			       struct drm_file *file_priv);
+
+static inline void nouveau_uvmm_lock(struct nouveau_uvmm *uvmm)
+{
+	mutex_lock(&uvmm->mutex);
+}
+
+static inline void nouveau_uvmm_unlock(struct nouveau_uvmm *uvmm)
+{
+	mutex_unlock(&uvmm->mutex);
+}
+
+#endif