From: Kevin Rogovin <kevin.rogovin@xxxxxxxxx>
---
include/drm-uapi/i915_drm.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
index 890df227ae..3a9c3a2d0c 100644
--- a/include/drm-uapi/i915_drm.h
+++ b/include/drm-uapi/i915_drm.h
@@ -262,6 +262,8 @@ typedef struct _drm_i915_sarea {
#define DRM_I915_PERF_OPEN 0x36
#define DRM_I915_PERF_ADD_CONFIG 0x37
#define DRM_I915_PERF_REMOVE_CONFIG 0x38
+#define DRM_I915_READ_SCRATCH_PAGE 0x39
+#define DRM_I915_WRITE_SCRATCH_PAGE 0x40
#define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
#define DRM_IOCTL_I915_FLUSH DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -319,6 +321,8 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_PERF_OPEN DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
#define DRM_IOCTL_I915_PERF_ADD_CONFIG DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_ADD_CONFIG, struct drm_i915_perf_oa_config)
#define DRM_IOCTL_I915_PERF_REMOVE_CONFIG DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_REMOVE_CONFIG, __u64)
+#define DRM_IOCTL_I915_READ_SCRATCH_PAGE DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_READ_SCRATCH_PAGE, struct drm_i915_scratch_page)
+#define DRM_IOCTL_I915_WRITE_SCRATCH_PAGE DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_WRITE_SCRATCH_PAGE, struct drm_i915_scratch_page)
/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.
@@ -1535,6 +1539,33 @@ struct drm_i915_perf_oa_config {
__u64 flex_regs_ptr;
};
+/**
+ * Structure to read/write scratch page of PPGTT. Read and writing
+ * values are not reliable unless the calling application guarantees
+ * that no batchbuffer that could read or write the scratch is in
+ * flight using the PPGTT between the time the ioctl is issued and
+ * it returns.
+ */
+struct drm_i915_scratch_page {
+ /**
+ * size in bytes of the backing store pointed to by buffer_ptr;
+ * kernel will return the actual size of the scratch page in
+ * this field as well.
+ */
+ __u32 buffer_size;
+
+ /**
+ * Pointer data with which to upload to or download from the
+ * scratch page; if the buffer size behind buffer_ptr is
+ * smaller than the scratch page size, then only the first
+ * buffer_size bytes are read or written. If the scratch
+ * page size is greater than buffer_size, then the bytes
+ * past the scratch page size in buffer behind bufer_ptr
+ * are not read or writte.
+ */
+ __u64 buffer_ptr;
+};
+
#if defined(__cplusplus)
}
#endif
--
2.15.0
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