Re: [PATCH v6 3/6] ACPI/IORT: Ignore all errors except EPROBE_DEFER
On Mon, May 29, 2017 at 10:36:42AM +0530, Sricharan R wrote:
> Hi Rafael,
>
> On 5/28/2017 12:48 AM, Rafael J. Wysocki wrote:
> > On Saturday, May 27, 2017 07:17:42 PM Sricharan R wrote:
> >> While deferring the probe of IOMMU masters, xlate and
> >> add_device callbacks called from iort_iommu_configure
> >> can pass back error values like -ENODEV, which means
> >> the IOMMU cannot be connected with that master for real
> >> reasons. Before the IOMMU probe deferral, all such errors
> >> were ignored. Now all those errors are propagated back,
> >> killing the master's probe for such errors. Instead ignore
> >> all the errors except EPROBE_DEFER, which is the only one
> >> of concern and let the master work without IOMMU, thus
> >> restoring the old behavior. Also make explicit that
> >> acpi_dma_configure handles only -EPROBE_DEFER from
> >> iort_iommu_configure.
> >>
> >> Fixes: 5a1bb638d567 ("drivers: acpi: Handle IOMMU lookup failure with
> >> deferred probing or error")
> >> Signed-off-by: Sricharan R
> >> ---
> >> drivers/acpi/arm64/iort.c | 6 ++
> >> drivers/acpi/scan.c | 4 ++--
> >> 2 files changed, 8 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> >> index c5fecf9..16e101f 100644
> >> --- a/drivers/acpi/arm64/iort.c
> >> +++ b/drivers/acpi/arm64/iort.c
> >> @@ -782,6 +782,12 @@ const struct iommu_ops *iort_iommu_configure(struct
> >> device *dev)
> >>if (err)
> >>ops = ERR_PTR(err);
> >>
> >> + /* Ignore all other errors apart from EPROBE_DEFER */
> >> + if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
> >> + dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
> >> + ops = NULL;
> >> + }
> >> +
> >>return ops;
> >> }
> >>
> >> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> >> index e39ec7b..3a10d757 100644
> >> --- a/drivers/acpi/scan.c
> >> +++ b/drivers/acpi/scan.c
> >> @@ -1371,8 +1371,8 @@ int acpi_dma_configure(struct device *dev, enum
> >> dev_dma_attr attr)
> >>iort_set_dma_mask(dev);
> >>
> >>iommu = iort_iommu_configure(dev);
> >> - if (IS_ERR(iommu))
> >> - return PTR_ERR(iommu);
> >> + if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
> >> + return -EPROBE_DEFER;
> >>
> >>size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
> >>/*
> >>
> >
> > ACK for the scan.c change and I'm assuming this to go in via ARM64.
> >
>
> Thanks for the ACK, should go through the IOMMU tree, since this fixes the
> IOMMU probe deferral
> that got merged through it.
Yes and it would be good to get them merged for -rc4 given that there
are bug fixes there, I agree the IOMMU tree is the way they should
go upstream.
Lorenzo
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Re: [PATCH v6 3/6] ACPI/IORT: Ignore all errors except EPROBE_DEFER
Hi Rafael,
On 5/28/2017 12:48 AM, Rafael J. Wysocki wrote:
> On Saturday, May 27, 2017 07:17:42 PM Sricharan R wrote:
>> While deferring the probe of IOMMU masters, xlate and
>> add_device callbacks called from iort_iommu_configure
>> can pass back error values like -ENODEV, which means
>> the IOMMU cannot be connected with that master for real
>> reasons. Before the IOMMU probe deferral, all such errors
>> were ignored. Now all those errors are propagated back,
>> killing the master's probe for such errors. Instead ignore
>> all the errors except EPROBE_DEFER, which is the only one
>> of concern and let the master work without IOMMU, thus
>> restoring the old behavior. Also make explicit that
>> acpi_dma_configure handles only -EPROBE_DEFER from
>> iort_iommu_configure.
>>
>> Fixes: 5a1bb638d567 ("drivers: acpi: Handle IOMMU lookup failure with
>> deferred probing or error")
>> Signed-off-by: Sricharan R
>> ---
>> drivers/acpi/arm64/iort.c | 6 ++
>> drivers/acpi/scan.c | 4 ++--
>> 2 files changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
>> index c5fecf9..16e101f 100644
>> --- a/drivers/acpi/arm64/iort.c
>> +++ b/drivers/acpi/arm64/iort.c
>> @@ -782,6 +782,12 @@ const struct iommu_ops *iort_iommu_configure(struct
>> device *dev)
>> if (err)
>> ops = ERR_PTR(err);
>>
>> +/* Ignore all other errors apart from EPROBE_DEFER */
>> +if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
>> +dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
>> +ops = NULL;
>> +}
>> +
>> return ops;
>> }
>>
>> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
>> index e39ec7b..3a10d757 100644
>> --- a/drivers/acpi/scan.c
>> +++ b/drivers/acpi/scan.c
>> @@ -1371,8 +1371,8 @@ int acpi_dma_configure(struct device *dev, enum
>> dev_dma_attr attr)
>> iort_set_dma_mask(dev);
>>
>> iommu = iort_iommu_configure(dev);
>> -if (IS_ERR(iommu))
>> -return PTR_ERR(iommu);
>> +if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
>> +return -EPROBE_DEFER;
>>
>> size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
>> /*
>>
>
> ACK for the scan.c change and I'm assuming this to go in via ARM64.
>
Thanks for the ACK, should go through the IOMMU tree, since this fixes the
IOMMU probe deferral
that got merged through it.
Regards,
Sricharan
> Thanks,
> Rafael
>
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Re: [PATCH v6 3/6] ACPI/IORT: Ignore all errors except EPROBE_DEFER
On Saturday, May 27, 2017 07:17:42 PM Sricharan R wrote:
> While deferring the probe of IOMMU masters, xlate and
> add_device callbacks called from iort_iommu_configure
> can pass back error values like -ENODEV, which means
> the IOMMU cannot be connected with that master for real
> reasons. Before the IOMMU probe deferral, all such errors
> were ignored. Now all those errors are propagated back,
> killing the master's probe for such errors. Instead ignore
> all the errors except EPROBE_DEFER, which is the only one
> of concern and let the master work without IOMMU, thus
> restoring the old behavior. Also make explicit that
> acpi_dma_configure handles only -EPROBE_DEFER from
> iort_iommu_configure.
>
> Fixes: 5a1bb638d567 ("drivers: acpi: Handle IOMMU lookup failure with
> deferred probing or error")
> Signed-off-by: Sricharan R
> ---
> drivers/acpi/arm64/iort.c | 6 ++
> drivers/acpi/scan.c | 4 ++--
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index c5fecf9..16e101f 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -782,6 +782,12 @@ const struct iommu_ops *iort_iommu_configure(struct
> device *dev)
> if (err)
> ops = ERR_PTR(err);
>
> + /* Ignore all other errors apart from EPROBE_DEFER */
> + if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
> + dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
> + ops = NULL;
> + }
> +
> return ops;
> }
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index e39ec7b..3a10d757 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1371,8 +1371,8 @@ int acpi_dma_configure(struct device *dev, enum
> dev_dma_attr attr)
> iort_set_dma_mask(dev);
>
> iommu = iort_iommu_configure(dev);
> - if (IS_ERR(iommu))
> - return PTR_ERR(iommu);
> + if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
>
> size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
> /*
>
ACK for the scan.c change and I'm assuming this to go in via ARM64.
Thanks,
Rafael
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[PATCH v6 3/6] ACPI/IORT: Ignore all errors except EPROBE_DEFER
While deferring the probe of IOMMU masters, xlate and
add_device callbacks called from iort_iommu_configure
can pass back error values like -ENODEV, which means
the IOMMU cannot be connected with that master for real
reasons. Before the IOMMU probe deferral, all such errors
were ignored. Now all those errors are propagated back,
killing the master's probe for such errors. Instead ignore
all the errors except EPROBE_DEFER, which is the only one
of concern and let the master work without IOMMU, thus
restoring the old behavior. Also make explicit that
acpi_dma_configure handles only -EPROBE_DEFER from
iort_iommu_configure.
Fixes: 5a1bb638d567 ("drivers: acpi: Handle IOMMU lookup failure with deferred
probing or error")
Signed-off-by: Sricharan R
---
drivers/acpi/arm64/iort.c | 6 ++
drivers/acpi/scan.c | 4 ++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index c5fecf9..16e101f 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -782,6 +782,12 @@ const struct iommu_ops *iort_iommu_configure(struct device
*dev)
if (err)
ops = ERR_PTR(err);
+ /* Ignore all other errors apart from EPROBE_DEFER */
+ if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) {
+ dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops));
+ ops = NULL;
+ }
+
return ops;
}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index e39ec7b..3a10d757 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1371,8 +1371,8 @@ int acpi_dma_configure(struct device *dev, enum
dev_dma_attr attr)
iort_set_dma_mask(dev);
iommu = iort_iommu_configure(dev);
- if (IS_ERR(iommu))
- return PTR_ERR(iommu);
+ if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
/*
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Code Aurora Forum, hosted by The Linux Foundation
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