Added IOCTL for writing 2D DMA command buffers over PCI. Bumped minor

    version number.

4 files changed, 100 insertions, 4 deletions

diff --git a/shared/via_dma.c b/shared/via_dma.c
index 83c14cf0..c11652c0 100644
--- a/shared/via_dma.c
+++ b/shared/via_dma.c
@@ -16,6 +16,8 @@
 #include "via_drm.h"
 #include "via_drv.h"
 
+#define VIA_2D_CMD 0xF0000000
+
 static void via_cmdbuf_start(drm_via_private_t * dev_priv);
 static void via_cmdbuf_pause(drm_via_private_t * dev_priv);
 static void via_cmdbuf_reset(drm_via_private_t * dev_priv);
@@ -223,6 +225,92 @@ int via_cmdbuffer( DRM_IOCTL_ARGS )
 	return 0;
 }
 
+static int via_parse_pci_cmdbuffer( drm_device_t *dev, const char *buf, 
+				    unsigned int size )
+{
+	drm_via_private_t *dev_priv = dev->dev_private;
+	uint32_t offset, value;
+	const uint32_t *regbuf = (uint32_t *)buf;
+	unsigned int i;
+
+	size >>=3 ;
+	for (i=0; i<size; ++i) {
+		offset = *regbuf; 
+		regbuf += 2;
+		if ((offset > ((0x7FF >> 2) | VIA_2D_CMD)) && 
+		    (offset < ((0xC00 >> 2) | VIA_2D_CMD)) ) {
+			DRM_DEBUG("Attempt to access Burst Command Area.\n");
+			return DRM_ERR( EINVAL );
+		} else if (offset > ((0xDFF >> 2) | VIA_2D_CMD)) {
+			DRM_DEBUG("Attempt to access DMA or VGA registers.\n");
+			return DRM_ERR( EINVAL );
+		}
+	}
+			
+	regbuf = (uint32_t *)buf;
+	for ( i=0; i<size; ++i ) {
+		offset = (*regbuf++ & ~VIA_2D_CMD) << 2;
+		value = *regbuf++;
+		VIA_WRITE( offset, value );
+	}
+	return 0;
+}
+		
+static int via_dispatch_pci_cmdbuffer(drm_device_t *dev, 
+				      drm_via_cmdbuffer_t *cmd )
+{
+	drm_via_private_t *dev_priv = dev->dev_private;
+	char *hugebuf;
+	int ret;
+
+	/*
+	 * We must be able to parse the buffer all at a time, so as
+	 * to return an error on an invalid operation without doing
+	 * anything.
+	 * Small buffers must, on the other hand be handled fast.
+	 */
+
+	if ( cmd->size > VIA_MAX_PCI_SIZE ) {
+		return DRM_ERR( ENOMEM );
+	} else if ( cmd->size > VIA_PREALLOCATED_PCI_SIZE ) {
+	  if (NULL == (hugebuf = (char *) kmalloc( cmd-> size, GFP_KERNEL )))
+			return DRM_ERR( ENOMEM );
+		DRM_COPY_FROM_USER( hugebuf, cmd->buf, cmd->size );
+		ret = via_parse_pci_cmdbuffer( dev, hugebuf, cmd->size );
+		kfree( hugebuf );
+	} else {
+		DRM_COPY_FROM_USER( dev_priv->pci_buf, cmd->buf, cmd->size );
+		ret = via_parse_pci_cmdbuffer( dev, dev_priv->pci_buf, cmd->size );
+	}
+	return ret;
+}
+
+
+
+int via_pci_cmdbuffer( DRM_IOCTL_ARGS )
+{
+	DRM_DEVICE;
+	drm_via_cmdbuffer_t cmdbuf;
+	int ret;
+
+	DRM_COPY_FROM_USER_IOCTL( cmdbuf, (drm_via_cmdbuffer_t *)data, 
+			sizeof(cmdbuf) );
+
+	DRM_DEBUG("via_pci_cmdbuffer, buf %p size %lu\n", cmdbuf.buf, cmdbuf.size);
+
+	if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
+		DRM_ERROR("via_pci_cmdbuffer called without lock held\n");
+		return DRM_ERR(EINVAL);
+	}
+
+	ret = via_dispatch_pci_cmdbuffer( dev, &cmdbuf );
+	if (ret) {
+		return ret;
+	}
+
+	return 0;
+}
+
 
 
 
diff --git a/shared/via_drm.h b/shared/via_drm.h
index 5325f62f..ddc89f83 100644
--- a/shared/via_drm.h
+++ b/shared/via_drm.h
@@ -38,6 +38,8 @@
 #define VIA_NR_XVMC_PORTS               10
 #define VIA_NR_XVMC_LOCKS               5
 #define VIA_MAX_CACHELINE_SIZE          64
+#define VIA_PREALLOCATED_PCI_SIZE       16384
+#define VIA_MAX_PCI_SIZE                65536
 #define XVMCLOCKPTR(saPriv,lockNo)					\
         ((volatile int *)(((((unsigned long) (saPriv)->XvMCLockArea) +	\
                             (VIA_MAX_CACHELINE_SIZE - 1)) &             \
@@ -67,8 +69,10 @@
 #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_CMDBUFFER	DRM_IOW(0x48, drm_via_cmdbuffer_t)
 #define DRM_IOCTL_VIA_FLUSH	DRM_IO(0x49)
+#define DRM_IOCTL_VIA_PCICMD	DRM_IOW(0x4A, drm_via_cmdbuffer_t)
+
 
 /* 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,
@@ -200,6 +204,7 @@ 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 );
+int via_pci_cmdbuffer( DRM_IOCTL_ARGS );
 
 #endif
 #endif /* _VIA_DRM_H_ */
diff --git a/shared/via_drv.c b/shared/via_drv.c
index b3119f66..8c4e7480 100644
--- a/shared/via_drv.c
+++ b/shared/via_drv.c
@@ -21,6 +21,7 @@
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
+
 #include <linux/config.h>
 #include "via.h"
 #include "drmP.h"
@@ -31,10 +32,10 @@
 
 #define DRIVER_NAME		"via"
 #define DRIVER_DESC		"VIA Unichrome"
-#define DRIVER_DATE		"20040819"
+#define DRIVER_DATE		"20040907"
 
 #define DRIVER_MAJOR		1
-#define DRIVER_MINOR		4
+#define DRIVER_MINOR		5
 #define DRIVER_PATCHLEVEL	0
 
 
@@ -47,7 +48,8 @@
         [DRM_IOCTL_NR(DRM_IOCTL_VIA_DEC_FUTEX)] = { via_decoder_futex, 1, 0}, \
         [DRM_IOCTL_NR(DRM_IOCTL_VIA_DMA_INIT)] = { via_dma_init, 1, 0}, \
         [DRM_IOCTL_NR(DRM_IOCTL_VIA_CMDBUFFER)] = { via_cmdbuffer, 1, 0}, \
-        [DRM_IOCTL_NR(DRM_IOCTL_VIA_FLUSH)] = { via_flush_ioctl, 1, 0}
+	[DRM_IOCTL_NR(DRM_IOCTL_VIA_FLUSH)] = { via_flush_ioctl, 1, 0}, \
+        [DRM_IOCTL_NR(DRM_IOCTL_VIA_PCICMD)] = { via_pci_cmdbuffer, 1, 0}
 
 
 #define __HAVE_COUNTERS		0
diff --git a/shared/via_drv.h b/shared/via_drv.h
index dd4a370f..39ccf0bd 100644
--- a/shared/via_drv.h
+++ b/shared/via_drv.h
@@ -46,6 +46,7 @@ typedef struct drm_via_private {
         uint32_t * last_pause_ptr;
         volatile uint32_t * hw_addr_ptr;
         drm_via_ring_buffer_t ring;
+	char pci_buf[VIA_PREALLOCATED_PCI_SIZE];
 } drm_via_private_t;