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added timeout and abort for DMA idle waits. This keeps the system responsive if the DMA engine fails, which is way better than a complete hang. Adding this because it's not impossible to create a situation that stalls DMA: for instance if a video app writes (way) outside it's allocated overlay buffers.

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10976 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Rudolf Cornelissen
2005-01-23 14:36:17 +00:00
parent 7605e77d21
commit d4a57f2736
1 changed files with 25 additions and 5 deletions
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src/add-ons/accelerants/nvidia/engine/nv_acc_dma.c
+25 -5
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@@ -32,17 +32,35 @@ static void nv_start_dma(void);
static status_t nv_acc_fifofree_dma(uint16 cmd_size);
static void nv_acc_cmd_dma(uint32 cmd, uint16 offset, uint16 size);
/* used to track engine DMA stalls */
static uint8 err;
/* wait until engine completely idle */
status_t nv_acc_wait_idle_dma()
{
/* wait until engine completely idle */
/* we'd better check for timeouts on the DMA engine as it's theoretically
* breakable by malfunctioning software */
uint16 cnt = 0;
/* wait until all upcoming commands are in execution at least */
while (NV_REG32(NVACC_FIFO + NV_GENERAL_DMAGET +
/* wait until all upcoming commands are in execution at least. Do this until
* we hit a timeout; abort if we failed at least three times before:
* if DMA stalls, we have to forget about it alltogether at some point, or
* the system will almost come to a complete halt.. */
while ((NV_REG32(NVACC_FIFO + NV_GENERAL_DMAGET +
si->engine.fifo.handle[(si->engine.fifo.ch_ptr[NV_ROP5_SOLID])])
!= (si->engine.dma.put << 2))
!= (si->engine.dma.put << 2)) &&
(cnt < 10000) && (err < 3))
{
/* snooze a bit so I do not hammer the bus */
snooze (100);
cnt++;
}
/* log timeout if we had one */
if (cnt == 10000)
{
err++;
LOG(4,("ACC_DMA: wait_idle DMA timeout #%d, engine trouble!\n", err));
}
/* wait until execution completed */
@@ -61,6 +79,8 @@ status_t nv_acc_init_dma()
{
uint16 cnt;
uint32 surf_depth, patt_depth;
/* reset the engine DMA stalls counter */
err = 0;
/* a hanging engine only recovers from a complete power-down/power-up cycle */
NV_REG32(NV32_PWRUPCTRL) = 0x13110011;
@@ -755,7 +775,7 @@ status_t nv_acc_init_dma()
patt_depth = 0x00000003;
break;
default:
LOG(8,("ACC: init, invalid bit depth\n"));
LOG(8,("ACC_DMA: init, invalid bit depth\n"));
return B_ERROR;
}