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dmaengine: at_xdmac: enhance channel errors handling in tasklet

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Complement the identification of errors with stopping the channel and
dumping the descriptor that led to the error case.

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Nicolas Ferre 2019-04-03 12:23:58 +02:00 committed by Vinod Koul
parent e2c114c06d
commit 223a4f4cfe
1 changed files with 42 additions and 6 deletions
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48
drivers/dma/at_xdmac.c
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@ -1575,6 +1575,46 @@ static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)
dmaengine_desc_get_callback_invoke(txd, NULL);
}
static void at_xdmac_handle_error(struct at_xdmac_chan *atchan)
{
struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device);
struct at_xdmac_desc *bad_desc;
/*
* The descriptor currently at the head of the active list is
* broken. Since we don't have any way to report errors, we'll
* just have to scream loudly and try to continue with other
* descriptors queued (if any).
*/
if (atchan->irq_status & AT_XDMAC_CIS_RBEIS)
dev_err(chan2dev(&atchan->chan), "read bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_WBEIS)
dev_err(chan2dev(&atchan->chan), "write bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_ROIS)
dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
spin_lock_bh(&atchan->lock);
/* Channel must be disabled first as it's not done automatically */
at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask);
while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask)
cpu_relax();
bad_desc = list_first_entry(&atchan->xfers_list,
struct at_xdmac_desc,
xfer_node);
spin_unlock_bh(&atchan->lock);
/* Print bad descriptor's details if needed */
dev_dbg(chan2dev(&atchan->chan),
"%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n",
__func__, &bad_desc->lld.mbr_sa, &bad_desc->lld.mbr_da,
bad_desc->lld.mbr_ubc);
/* Then continue with usual descriptor management */
}
static void at_xdmac_tasklet(unsigned long data)
{
struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data;
@ -1594,12 +1634,8 @@ static void at_xdmac_tasklet(unsigned long data)
|| (atchan->irq_status & error_mask)) {
struct dma_async_tx_descriptor *txd;
if (atchan->irq_status & AT_XDMAC_CIS_RBEIS)
dev_err(chan2dev(&atchan->chan), "read bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_WBEIS)
dev_err(chan2dev(&atchan->chan), "write bus error!!!");
if (atchan->irq_status & AT_XDMAC_CIS_ROIS)
dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
if (atchan->irq_status & error_mask)
at_xdmac_handle_error(atchan);
spin_lock(&atchan->lock);
desc = list_first_entry(&atchan->xfers_list,