[RFC 02/13] drm/i915/svm: Define SVM UAPI

[Niranjana Vishwanathapura]

Define UAPI for Shared Virtual Memory (SVM) fucntionality including
SVM capability and configurability.
When there is no GPU page fault support available, add ioctls
to explicitly bind and migrate virtual address ranges.

Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Jon Bloomfield <jon.bloomfield at intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Sudeep Dutt <sudeep.dutt at intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
Signed-off-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota at intel.com>
---
 include/uapi/drm/i915_drm.h | 70 +++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index b127a99da1c1..33b3127fc3ae 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -360,6 +360,10 @@ typedef struct _drm_i915_sarea {
 #define DRM_I915_GEM_VM_CREATE		0x3a
 #define DRM_I915_GEM_VM_DESTROY		0x3b
 #define DRM_I915_GEM_OBJECT_SETPARAM	DRM_I915_GEM_CONTEXT_SETPARAM
+#define DRM_I915_GEM_VM_GETPARAM        DRM_I915_GEM_CONTEXT_GETPARAM
+#define DRM_I915_GEM_VM_SETPARAM        DRM_I915_GEM_CONTEXT_SETPARAM
+#define DRM_I915_BIND			0x3c
+#define DRM_I915_SVM_MIGRATE		0x3d
 /* Must be kept compact -- no holes */
 
 #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
@@ -423,6 +427,10 @@ typedef struct _drm_i915_sarea {
 #define DRM_IOCTL_I915_GEM_VM_CREATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_control)
 #define DRM_IOCTL_I915_GEM_VM_DESTROY	DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, struct drm_i915_gem_vm_control)
 #define DRM_IOCTL_I915_GEM_OBJECT_SETPARAM	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_OBJECT_SETPARAM, struct drm_i915_gem_object_param)
+#define DRM_IOCTL_I915_GEM_VM_GETPARAM		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_GETPARAM, struct drm_i915_gem_vm_param)
+#define DRM_IOCTL_I915_GEM_VM_SETPARAM		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_SETPARAM, struct drm_i915_gem_vm_param)
+#define DRM_IOCTL_I915_BIND		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_BIND, struct drm_i915_bind)
+#define DRM_IOCTL_I915_SVM_MIGRATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SVM_MIGRATE, struct drm_i915_svm_migrate)
 
 /* Allow drivers to submit batchbuffers directly to hardware, relying
  * on the security mechanisms provided by hardware.
@@ -620,6 +628,9 @@ typedef struct drm_i915_irq_wait {
  */
 #define I915_PARAM_PERF_REVISION	54
 
+/* Shared Virtual Memory (SVM) support capability */
+#define I915_PARAM_HAS_SVM		55
+
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
@@ -1815,6 +1826,17 @@ struct drm_i915_gem_vm_control {
 	__u32 vm_id;
 };
 
+struct drm_i915_gem_vm_param {
+	__u32 vm_id;
+	__u32 rsvd;
+
+#define I915_VM_PARAM     (2ull << 32)
+#define I915_GEM_VM_PARAM_SVM   0x1
+	__u64 param;
+
+	__u64 value;
+};
+
 struct drm_i915_reg_read {
 	/*
 	 * Register offset.
@@ -2268,6 +2290,54 @@ struct drm_i915_query_perf_config {
 	__u8 data[];
 };
 
+/**
+ * struct drm_i915_bind
+ *
+ * Bind an object/buffer in a vm's page table.
+ */
+struct drm_i915_bind {
+	/** VA start to bind **/
+	__u64 start;
+
+	/**
+	 * VA length to [un]bind
+	 * length only required while binding buffers.
+	 */
+	__u64 length;
+
+	/** Type of memory to [un]bind **/
+	__u32 type;
+#define I915_BIND_SVM_BUFFER       0
+#define I915_BIND_SVM_GEM_OBJ      1
+
+	/** Object handle to [un]bind for I915_BIND_SVM_GEM_OBJ type **/
+	__u32 handle;
+
+	/** vm to [un]bind **/
+	__u32 vm_id;
+
+	/** Flags **/
+	__u32 flags;
+#define I915_BIND_UNBIND      (1 << 0)
+#define I915_BIND_READONLY    (1 << 1)
+};
+
+/**
+ * struct drm_i915_svm_migrate
+ *
+ * Migrate an address range to a memory region.
+ */
+struct drm_i915_svm_migrate {
+	/** VA start to migrate **/
+	__u64 start;
+
+	/** VA length to migrate **/
+	__u64 length;
+
+	/** Memory region to migrate to **/
+	__u32 region;
+};
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.21.0.rc0.32.g243a4c7e27