VIA:

1) Security fix: Stopped possible MMIO access to PCI DMA area for the
    unichrome Pro.
2) Fixed an odd cpu usage problem by padding small AGP DMA submissions.
    Bumped patchlevel.

3 files changed, 40 insertions, 9 deletions

diff --git a/shared/via.h b/shared/via.h
index 816880e7..fcfefae7 100644
--- a/shared/via.h
+++ b/shared/via.h
@@ -30,11 +30,11 @@
 
 #define DRIVER_NAME		"via"
 #define DRIVER_DESC		"VIA Unichrome / Pro"
-#define DRIVER_DATE		"20050328"
+#define DRIVER_DATE		"20050418"
 
 #define DRIVER_MAJOR		2
 #define DRIVER_MINOR		6
-#define DRIVER_PATCHLEVEL	0
+#define DRIVER_PATCHLEVEL	1
 
 #define DRIVER_IOCTLS							\
         [DRM_IOCTL_NR(DRM_IOCTL_VIA_ALLOCMEM)]  = { via_mem_alloc,  1, 0 }, \
diff --git a/shared/via_dma.c b/shared/via_dma.c
index 34ac6cc1..c6c14dc0 100644
--- a/shared/via_dma.c
+++ b/shared/via_dma.c
@@ -42,7 +42,7 @@
 #include "via_3d_reg.h"
 
 #define CMDBUF_ALIGNMENT_SIZE   (0x100)
-#define CMDBUF_ALIGNMENT_MASK   (0xff)
+#define CMDBUF_ALIGNMENT_MASK   (0x0ff)
 
 /* defines for VIA 3D registers */
 #define VIA_REG_STATUS          0x400
@@ -74,6 +74,9 @@ static void via_cmdbuf_pause(drm_via_private_t * dev_priv);
 static void via_cmdbuf_reset(drm_via_private_t * dev_priv);
 static void via_cmdbuf_rewind(drm_via_private_t * dev_priv);
 static int via_wait_idle(drm_via_private_t * dev_priv);
+static void via_pad_cache(drm_via_private_t *dev_priv, int qwords);
+
+
 /*
  * Free space in command buffer.
  */
@@ -251,6 +254,8 @@ int via_dma_init(DRM_IOCTL_ARGS)
 	return retcode;
 }
 
+
+
 static int via_dispatch_cmdbuffer(drm_device_t * dev, drm_via_cmdbuffer_t * cmd)
 {
 	drm_via_private_t *dev_priv;
@@ -284,7 +289,8 @@ static int via_dispatch_cmdbuffer(drm_device_t * dev, drm_via_cmdbuffer_t * cmd)
 		return ret;
 	}
        	
-	vb = via_check_dma(dev_priv, cmd->size);
+	
+	vb = via_check_dma(dev_priv, (cmd->size < 0x100) ? 0x102 : cmd->size);
 	if (vb == NULL) {
 		return DRM_ERR(EAGAIN);
 	}
@@ -292,6 +298,14 @@ static int via_dispatch_cmdbuffer(drm_device_t * dev, drm_via_cmdbuffer_t * cmd)
 	memcpy(vb, dev_priv->pci_buf, cmd->size);
 	
 	dev_priv->dma_low += cmd->size;
+
+	/*
+	 * Small submissions somehow stalls the CPU. (AGP cache effects?)
+	 * pad to greater size.
+	 */
+
+	if (cmd->size < 0x100)
+	  via_pad_cache(dev_priv,(0x100 - cmd->size) >> 3);
 	via_cmdbuf_pause(dev_priv);
 
 	return 0;
@@ -385,7 +399,7 @@ int via_pci_cmdbuffer(DRM_IOCTL_ARGS)
 static inline uint32_t *via_align_buffer(drm_via_private_t * dev_priv,
 					 uint32_t * vb, int qw_count)
 {
-	for (; qw_count > 0; --qw_count) {
+        for (; qw_count > 0; --qw_count) {
 		VIA_OUT_RING_QW(HC_DUMMY, HC_DUMMY);
 	}
 	return vb;
@@ -556,6 +570,16 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
 	VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
 }
 
+static void via_pad_cache(drm_via_private_t *dev_priv, int qwords)
+{
+	uint32_t *vb;
+
+	via_cmdbuf_wait(dev_priv, qwords + 2);
+	vb = via_get_dma(dev_priv);
+	VIA_OUT_RING_QW( HC_HEADER2, HC_ParaType_NotTex << 16);
+	via_align_buffer(dev_priv,vb,qwords);
+}
+
 static inline void via_dummy_bitblt(drm_via_private_t * dev_priv)
 {
 	uint32_t *vb = via_get_dma(dev_priv);
diff --git a/shared/via_verifier.c b/shared/via_verifier.c
index 742d7cea..ed14b1c6 100644
--- a/shared/via_verifier.c
+++ b/shared/via_verifier.c
@@ -28,8 +28,10 @@
  * be very slow.
  */
 
-#include "via.h"
+
+
 #include "via_3d_reg.h"
+#include "via.h"
 #include "drmP.h"
 #include "drm.h"
 #include "via_drm.h"
@@ -693,11 +695,12 @@ via_parse_header2( drm_via_private_t *dev_priv, uint32_t const **buffer, const u
 	VIA_WRITE(HC_REG_TRANS_SET + HC_REG_BASE, *buf++);
 	switch(cmd) {
 	case HC_ParaType_CmdVdata:
-		while ((*fire_count < dev_priv->num_fire_offsets) && 
+		while ((buf < buf_end) &&
+		       (*fire_count < dev_priv->num_fire_offsets) && 
 		       (*buf & HC_ACMD_MASK) == HC_ACMD_HCmdB ) {
 			while(buf <= next_fire) {
-			  VIA_WRITE(HC_REG_TRANS_SPACE + HC_REG_BASE + (burst & 63), *buf++);
-			  burst += 4;
+				VIA_WRITE(HC_REG_TRANS_SPACE + HC_REG_BASE + (burst & 63), *buf++);
+				burst += 4;
 			}
 			if ( ( buf < buf_end ) && ((*buf & HALCYON_FIREMASK) == HALCYON_FIRECMD))
 				buf++;
@@ -731,6 +734,10 @@ verify_mmio_address( uint32_t address)
 		DRM_ERROR("Invalid VIDEO DMA command. "
 			  "Attempt to access 3D- or command burst area.\n");
 		return 1;
+	} else if ((address > 0xCFF) && (address < 0x1300)) {
+		DRM_ERROR("Invalid VIDEO DMA command. "
+			  "Attempt to access PCI DMA area.\n");
+		return 1;		
 	} else if (address > 0x13FF ) {
 		DRM_ERROR("Invalid VIDEO DMA command. "
 			  "Attempt to access VGA registers.\n");