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path: root/drivers/char/drm/via_dma.c
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Diffstat (limited to 'drivers/char/drm/via_dma.c')
-rw-r--r--drivers/char/drm/via_dma.c111
1 files changed, 46 insertions, 65 deletions
diff --git a/drivers/char/drm/via_dma.c b/drivers/char/drm/via_dma.c
index c0539c6299c..13a9c5ca459 100644
--- a/drivers/char/drm/via_dma.c
+++ b/drivers/char/drm/via_dma.c
@@ -252,7 +252,7 @@ static int via_dma_init(DRM_IOCTL_ARGS)
break;
case VIA_DMA_INITIALIZED:
retcode = (dev_priv->ring.virtual_start != NULL) ?
- 0 : DRM_ERR(EFAULT);
+ 0 : DRM_ERR(EFAULT);
break;
default:
retcode = DRM_ERR(EINVAL);
@@ -432,56 +432,34 @@ static int via_hook_segment(drm_via_private_t * dev_priv,
{
int paused, count;
volatile uint32_t *paused_at = dev_priv->last_pause_ptr;
+ uint32_t reader,ptr;
+ paused = 0;
via_flush_write_combine();
- while (!*(via_get_dma(dev_priv) - 1)) ;
- *dev_priv->last_pause_ptr = pause_addr_lo;
+ (void) *(volatile uint32_t *)(via_get_dma(dev_priv) -1);
+ *paused_at = pause_addr_lo;
via_flush_write_combine();
-
- /*
- * The below statement is inserted to really force the flush.
- * Not sure it is needed.
- */
-
- while (!*dev_priv->last_pause_ptr) ;
+ (void) *paused_at;
+ reader = *(dev_priv->hw_addr_ptr);
+ ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) +
+ dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
dev_priv->last_pause_ptr = via_get_dma(dev_priv) - 1;
- while (!*dev_priv->last_pause_ptr) ;
- paused = 0;
- count = 20;
-
- while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--) ;
- if ((count <= 8) && (count >= 0)) {
- uint32_t rgtr, ptr;
- rgtr = *(dev_priv->hw_addr_ptr);
- ptr = ((volatile char *)dev_priv->last_pause_ptr -
- dev_priv->dma_ptr) + dev_priv->dma_offset +
- (uint32_t) dev_priv->agpAddr + 4 - CMDBUF_ALIGNMENT_SIZE;
- if (rgtr <= ptr) {
- DRM_ERROR
- ("Command regulator\npaused at count %d, address %x, "
- "while current pause address is %x.\n"
- "Please mail this message to "
- "<unichrome-devel@lists.sourceforge.net>\n", count,
- rgtr, ptr);
- }
+ if ((ptr - reader) <= dev_priv->dma_diff ) {
+ count = 10000000;
+ while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--);
}
if (paused && !no_pci_fire) {
- uint32_t rgtr, ptr;
- uint32_t ptr_low;
+ reader = *(dev_priv->hw_addr_ptr);
+ if ((ptr - reader) == dev_priv->dma_diff) {
- count = 1000000;
- while ((VIA_READ(VIA_REG_STATUS) & VIA_CMD_RGTR_BUSY)
- && count--) ;
+ /*
+ * There is a concern that these writes may stall the PCI bus
+ * if the GPU is not idle. However, idling the GPU first
+ * doesn't make a difference.
+ */
- rgtr = *(dev_priv->hw_addr_ptr);
- ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) +
- dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
-
- ptr_low = (ptr > 3 * CMDBUF_ALIGNMENT_SIZE) ?
- ptr - 3 * CMDBUF_ALIGNMENT_SIZE : 0;
- if (rgtr <= ptr && rgtr >= ptr_low) {
VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
@@ -494,6 +472,9 @@ static int via_hook_segment(drm_via_private_t * dev_priv,
static int via_wait_idle(drm_via_private_t * dev_priv)
{
int count = 10000000;
+
+ while (!(VIA_READ(VIA_REG_STATUS) & VIA_VR_QUEUE_BUSY) && count--);
+
while (count-- && (VIA_READ(VIA_REG_STATUS) &
(VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY |
VIA_3D_ENG_BUSY))) ;
@@ -537,6 +518,9 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
uint32_t end_addr, end_addr_lo;
uint32_t command;
uint32_t agp_base;
+ uint32_t ptr;
+ uint32_t reader;
+ int count;
dev_priv->dma_low = 0;
@@ -554,7 +538,7 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
&pause_addr_hi, &pause_addr_lo, 1) - 1;
via_flush_write_combine();
- while (!*dev_priv->last_pause_ptr) ;
+ (void) *(volatile uint32_t *)dev_priv->last_pause_ptr;
VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
VIA_WRITE(VIA_REG_TRANSPACE, command);
@@ -566,6 +550,24 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
DRM_WRITEMEMORYBARRIER();
VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
VIA_READ(VIA_REG_TRANSPACE);
+
+ dev_priv->dma_diff = 0;
+
+ count = 10000000;
+ while (!(VIA_READ(0x41c) & 0x80000000) && count--);
+
+ reader = *(dev_priv->hw_addr_ptr);
+ ptr = ((volatile char *)dev_priv->last_pause_ptr - dev_priv->dma_ptr) +
+ dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
+
+ /*
+ * This is the difference between where we tell the
+ * command reader to pause and where it actually pauses.
+ * This differs between hw implementation so we need to
+ * detect it.
+ */
+
+ dev_priv->dma_diff = ptr - reader;
}
static void via_pad_cache(drm_via_private_t * dev_priv, int qwords)
@@ -592,7 +594,6 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
uint32_t pause_addr_lo, pause_addr_hi;
uint32_t jump_addr_lo, jump_addr_hi;
volatile uint32_t *last_pause_ptr;
- uint32_t dma_low_save1, dma_low_save2;
agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi,
@@ -619,31 +620,11 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
&pause_addr_lo, 0);
*last_pause_ptr = pause_addr_lo;
- dma_low_save1 = dev_priv->dma_low;
-
- /*
- * Now, set a trap that will pause the regulator if it tries to rerun the old
- * command buffer. (Which may happen if via_hook_segment detecs a command regulator pause
- * and reissues the jump command over PCI, while the regulator has already taken the jump
- * and actually paused at the current buffer end).
- * There appears to be no other way to detect this condition, since the hw_addr_pointer
- * does not seem to get updated immediately when a jump occurs.
- */
- last_pause_ptr =
- via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
- &pause_addr_lo, 0) - 1;
- via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
- &pause_addr_lo, 0);
- *last_pause_ptr = pause_addr_lo;
-
- dma_low_save2 = dev_priv->dma_low;
- dev_priv->dma_low = dma_low_save1;
- via_hook_segment(dev_priv, jump_addr_hi, jump_addr_lo, 0);
- dev_priv->dma_low = dma_low_save2;
- via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
+ via_hook_segment( dev_priv, jump_addr_hi, jump_addr_lo, 0);
}
+
static void via_cmdbuf_rewind(drm_via_private_t * dev_priv)
{
via_cmdbuf_jump(dev_priv);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-29 13:48:46 +0000