Re: [PATCH 2/3] dmaengine: at_xdmac: enhance channel errors handling in tasklet
Vinod,
Thanks for your review, I'm preparing v2.
On 11/02/2019 at 12:58, Vinod Koul wrote:
> On 05-02-19, 12:03, Nicolas Ferre wrote:
>> Complement the identification of errors with stoping the channel and
>> dumping the descriptor that led to the error case.
>>
>> Signed-off-by: Nicolas Ferre
>> ---
>> drivers/dma/at_xdmac.c | 43 --
>> 1 file changed, 37 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
>> index 37a269420435..ec7a29d8e448 100644
>> --- a/drivers/dma/at_xdmac.c
>> +++ b/drivers/dma/at_xdmac.c
>> @@ -1575,6 +1575,41 @@ 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
>> + * broked. Since we don't have any way to report errors, we'll
>
> You meant borked or broken...
Broken
>
>> + * just have to scream loudly and try to carry on.
>
> should we carry on or abort..?
Changed in:
* 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 */
>
> Well this is not great to look and read at, please do consider adding
> empty line before comments or logical blocks..
True, indeed.
>> +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);
>
> not dev_err?
Well, we have the dev_err at the beginning of the function, I think it's
enough: this is really debugging information that needs to be activated
to track the DMA configuration bug: it's not meant for production.
>> +
>> +/* 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 +1629,8 @@ 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,
>> --
>> 2.17.1
>
--
Nicolas Ferre
Re: [PATCH 2/3] dmaengine: at_xdmac: enhance channel errors handling in tasklet
On 05-02-19, 12:03, Nicolas Ferre wrote:
> Complement the identification of errors with stoping the channel and
> dumping the descriptor that led to the error case.
>
> Signed-off-by: Nicolas Ferre
> ---
> drivers/dma/at_xdmac.c | 43 --
> 1 file changed, 37 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index 37a269420435..ec7a29d8e448 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -1575,6 +1575,41 @@ 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
> + * broked. Since we don't have any way to report errors, we'll
You meant borked or broken...
> + * just have to scream loudly and try to carry on.
should we carry on or abort..?
> + */
> + 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 */
Well this is not great to look and read at, please do consider adding
empty line before comments or logical blocks..
> + 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);
not dev_err?
> +
> + /* 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 +1629,8 @@ 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,
> --
> 2.17.1
--
~Vinod
Re: [PATCH 2/3] dmaengine: at_xdmac: enhance channel errors handling in tasklet
On Tue, Feb 05, 2019 at 12:03:42PM +0100, Nicolas Ferre wrote:
> Complement the identification of errors with stoping the channel and
> dumping the descriptor that led to the error case.
>
> Signed-off-by: Nicolas Ferre
Acked-by: Ludovic Desroches
> ---
> drivers/dma/at_xdmac.c | 43 --
> 1 file changed, 37 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index 37a269420435..ec7a29d8e448 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -1575,6 +1575,41 @@ 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
> + * broked. Since we don't have any way to report errors, we'll
> + * just have to scream loudly and try to carry on.
> + */
> + 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 +1629,8 @@ 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,
> --
> 2.17.1
>
[PATCH 2/3] dmaengine: at_xdmac: enhance channel errors handling in tasklet
Complement the identification of errors with stoping the channel and
dumping the descriptor that led to the error case.
Signed-off-by: Nicolas Ferre
---
drivers/dma/at_xdmac.c | 43 --
1 file changed, 37 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 37a269420435..ec7a29d8e448 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1575,6 +1575,41 @@ 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
+* broked. Since we don't have any way to report errors, we'll
+* just have to scream loudly and try to carry on.
+*/
+ 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 +1629,8 @@ 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,
--
2.17.1
