This patch adds three new ioctl's to the VIA Unichrome/Pro DRM driver:

    DRM_IOCTL_VIA_DMA_INIT DRM_IOCTL_VIA_CMDBUFFER DRM_IOCTL_VIA_FLUSH
The first ioctl sets up an area in AGP memory that will be used as the ring
    buffer. The second ioctl copies a command buffer from user space memory
    to the ring buffer. The third ioctl waits for engine idle until it
    returns.
The motivation for this patch is to avoid the wait for engine idle call
    before each buffer flush in the current DRI driver. With this patch,
    the DRI driver can continue to flush its buffer as long as there is
    free space in the ring buffer.
This patch adds an additional copy operation on the command buffer. This
    buffer copying is necessary to support multiple DRI clients rendering
    simultaneously. Otherwise, more CPU time will be spent in the busy loop
    waiting for engine idle between DRI context switch. Even in the single
    client case, the tradeoff is reasonable in comparision to the kernel
    call to check for free buffer space for the client to render directly
    to the ring buffer.

1 files changed, 22 insertions, 0 deletions

diff --git a/shared-core/via_drm.h b/shared-core/via_drm.h
index e984932c..5325f62f 100644
--- a/shared-core/via_drm.h
+++ b/shared-core/via_drm.h
@@ -66,6 +66,9 @@
 #define DRM_IOCTL_VIA_FB_INIT	DRM_IOWR(0x43, drm_via_fb_t)
 #define DRM_IOCTL_VIA_MAP_INIT	DRM_IOWR(0x44, drm_via_init_t)
 #define DRM_IOCTL_VIA_DEC_FUTEX DRM_IOW(0x45, drm_via_futex_t)
+#define DRM_IOCTL_VIA_DMA_INIT	DRM_IOWR(0x47, drm_via_dma_init_t)
+#define DRM_IOCTL_VIA_CMDBUFFER	DRM_IOWR(0x48, drm_via_dma_init_t)
+#define DRM_IOCTL_VIA_FLUSH	DRM_IO(0x49)
 
 /* Indices into buf.Setup where various bits of state are mirrored per
  * context and per buffer.  These can be fired at the card as a unit,
@@ -123,6 +126,22 @@ typedef struct _drm_via_futex {
         unsigned int val;
 } drm_via_futex_t;
 
+typedef struct _drm_via_dma_init {
+        enum {
+                VIA_INIT_DMA = 0x01,
+                VIA_CLEANUP_DMA = 0x02
+        } func;
+
+        unsigned long offset;
+        unsigned long size;
+        unsigned long reg_pause_addr;
+} drm_via_dma_init_t;
+
+typedef struct _drm_via_cmdbuffer {
+        char *buf;
+        unsigned long size;
+} drm_via_cmdbuffer_t;
+
 /* Warning: If you change the SAREA structure you must change the Xserver
  * structure as well */
 
@@ -178,6 +197,9 @@ int via_mem_free( DRM_IOCTL_ARGS );
 int via_agp_init( DRM_IOCTL_ARGS );				
 int via_map_init( DRM_IOCTL_ARGS );				
 int via_decoder_futex( DRM_IOCTL_ARGS ); 
+int via_dma_init( DRM_IOCTL_ARGS );
+int via_cmdbuffer( DRM_IOCTL_ARGS );
+int via_flush_ioctl( DRM_IOCTL_ARGS );
 
 #endif
 #endif /* _VIA_DRM_H_ */