Patchwork PCI-AER: Do not report successful error recovery for devices with AER-unaware drivers

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Submitter Pandarathil, Vijaymohan R
Date Nov. 9, 2012, 4:28 a.m.
Message ID <F9E001219150CB45BEDC82A650F360C9014674B9@G9W0717.americas.hpqcorp.net>
Download mbox | patch
Permalink /patch/197926/
State Superseded
Headers show

Comments

Pandarathil, Vijaymohan R - Nov. 9, 2012, 4:28 a.m.
When an error is detected on a PCIe device which does not have an
AER-aware driver, prevent AER infrastructure from reporting
successful error recovery.

This is because the report_error_detected() function that gets
called in the first phase of recovery process allows forward
progress even when the driver for the device does not have AER
capabilities. It seems that all callbacks (in pci_error_handlers
structure) registered by drivers that gets called during error
recovery are not mandatory. So the intention of the infrastructure
design seems to be to allow forward progress even when a specific
callback has not been registered by a driver. However, if error
handler structure itself has not been registered, it doesn't make
sense to allow forward progress.

As a result of the current design, in the case of a single device
having an AER-unaware driver or in the case of any function in a
multi-function card having an AER-unaware driver, a successful
recovery is reported.

Typical scenario this happens is when a PCI device is detached
from a KVM host and the pci-stub driver on the host claims the
device. The pci-stub driver does not have error handling capabilities
but the AER infrastructure still reports that the device recovered
successfully.

The changes proposed here leaves the device in an unrecovered state
if the driver for the device or for any function in a multi-function
card does not have error handler structure registered. This reflects
the true state of the device and prevents any partial recovery (or no
recovery at all) reported as successful.

Please also see comments from Linas Vepstas at the following link
http://www.spinics.net/lists/linux-pci/msg18572.html

Signed-off-by: Linas Vepstas <linasvepstas <at> gmail.com>
Signed-off-by: Myron Stowe <mstowe <at> redhat.com>
Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil <at> hp.com>

---

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Myron Stowe - Nov. 9, 2012, 5:06 p.m.
Adding: linasvepstas@gmail.com

On Thu, Nov 8, 2012 at 9:28 PM, Pandarathil, Vijaymohan R
<vijaymohan.pandarathil@hp.com> wrote:
> When an error is detected on a PCIe device which does not have an
> AER-aware driver, prevent AER infrastructure from reporting
> successful error recovery.
>
> This is because the report_error_detected() function that gets
> called in the first phase of recovery process allows forward
> progress even when the driver for the device does not have AER
> capabilities. It seems that all callbacks (in pci_error_handlers
> structure) registered by drivers that gets called during error
> recovery are not mandatory. So the intention of the infrastructure
> design seems to be to allow forward progress even when a specific
> callback has not been registered by a driver. However, if error
> handler structure itself has not been registered, it doesn't make
> sense to allow forward progress.
>
> As a result of the current design, in the case of a single device
> having an AER-unaware driver or in the case of any function in a
> multi-function card having an AER-unaware driver, a successful
> recovery is reported.
>
> Typical scenario this happens is when a PCI device is detached
> from a KVM host and the pci-stub driver on the host claims the
> device. The pci-stub driver does not have error handling capabilities
> but the AER infrastructure still reports that the device recovered
> successfully.
>
> The changes proposed here leaves the device in an unrecovered state
> if the driver for the device or for any function in a multi-function
> card does not have error handler structure registered. This reflects
> the true state of the device and prevents any partial recovery (or no
> recovery at all) reported as successful.
>
> Please also see comments from Linas Vepstas at the following link
> http://www.spinics.net/lists/linux-pci/msg18572.html
>
> Signed-off-by: Linas Vepstas <linasvepstas <at> gmail.com>
> Signed-off-by: Myron Stowe <mstowe <at> redhat.com>
> Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil <at> hp.com>

Hay Vijay:

I think Linas may have steered you incorrectly with his "FWIW, I guess
I could add a
Signed-off-by: Linas Vepstas <...>" comment.

From ./Documentation/SubmittingPatches, "The Signed-off-by: tag
indicates that the
signer was involved in the development of the patch, or that he/she
was in the patch's
delivery path."

I this case I suspect that "reviewed-by" or 'acked-by" would be more
appropriate for
both Linas (unless of course Linas worked with you in developing the patch) and
myslef.

Also, when posting to the list it's considered good etiquette to
include (cc) everyone
cited in the Signed-off, reviewed-by, acked-by, ..., lines (and
possibly the linux-kernel
list - again see ./Documentation/SubmittingPatches).

Myron
>
> ---
>
> diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
> index 06bad96..030b229 100644
> --- a/drivers/pci/pcie/aer/aerdrv_core.c
> +++ b/drivers/pci/pcie/aer/aerdrv_core.c
> @@ -215,6 +215,12 @@ static int report_error_detected(struct pci_dev *dev, void *data)
>
>         dev->error_state = result_data->state;
>
> +       if ((!dev->driver || !dev->driver->err_handler) &&
> +               !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
> +               dev_info(&dev->dev, "AER: Error detected but no driver has claimed this device or the driver is AER-unaware\n");
> +               result_data->result = PCI_ERS_RESULT_NONE;
> +               return 1;
> +       }
>         if (!dev->driver ||
>                 !dev->driver->err_handler ||
>                 !dev->driver->err_handler->error_detected) {
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
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Linas Vepstas - Nov. 10, 2012, 3:28 a.m.
Yes, that is correct: Reviewed-by/Acked-by: me. I plead late-night wooziness.

-- Linas

On 9 November 2012 11:06, Myron Stowe <myron.stowe@gmail.com> wrote:
> Adding: linasvepstas@gmail.com
>
> On Thu, Nov 8, 2012 at 9:28 PM, Pandarathil, Vijaymohan R
> <vijaymohan.pandarathil@hp.com> wrote:
>> When an error is detected on a PCIe device which does not have an
>> AER-aware driver, prevent AER infrastructure from reporting
>> successful error recovery.
>>
>> This is because the report_error_detected() function that gets
>> called in the first phase of recovery process allows forward
>> progress even when the driver for the device does not have AER
>> capabilities. It seems that all callbacks (in pci_error_handlers
>> structure) registered by drivers that gets called during error
>> recovery are not mandatory. So the intention of the infrastructure
>> design seems to be to allow forward progress even when a specific
>> callback has not been registered by a driver. However, if error
>> handler structure itself has not been registered, it doesn't make
>> sense to allow forward progress.
>>
>> As a result of the current design, in the case of a single device
>> having an AER-unaware driver or in the case of any function in a
>> multi-function card having an AER-unaware driver, a successful
>> recovery is reported.
>>
>> Typical scenario this happens is when a PCI device is detached
>> from a KVM host and the pci-stub driver on the host claims the
>> device. The pci-stub driver does not have error handling capabilities
>> but the AER infrastructure still reports that the device recovered
>> successfully.
>>
>> The changes proposed here leaves the device in an unrecovered state
>> if the driver for the device or for any function in a multi-function
>> card does not have error handler structure registered. This reflects
>> the true state of the device and prevents any partial recovery (or no
>> recovery at all) reported as successful.
>>
>> Please also see comments from Linas Vepstas at the following link
>> http://www.spinics.net/lists/linux-pci/msg18572.html
>>
>> Signed-off-by: Linas Vepstas <linasvepstas <at> gmail.com>
>> Signed-off-by: Myron Stowe <mstowe <at> redhat.com>
>> Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil <at> hp.com>
>
> Hay Vijay:
>
> I think Linas may have steered you incorrectly with his "FWIW, I guess
> I could add a
> Signed-off-by: Linas Vepstas <...>" comment.
>
> From ./Documentation/SubmittingPatches, "The Signed-off-by: tag
> indicates that the
> signer was involved in the development of the patch, or that he/she
> was in the patch's
> delivery path."
>
> I this case I suspect that "reviewed-by" or 'acked-by" would be more
> appropriate for
> both Linas (unless of course Linas worked with you in developing the patch) and
> myslef.
>
> Also, when posting to the list it's considered good etiquette to
> include (cc) everyone
> cited in the Signed-off, reviewed-by, acked-by, ..., lines (and
> possibly the linux-kernel
> list - again see ./Documentation/SubmittingPatches).
>
> Myron
>>
>> ---
>>
>> diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
>> index 06bad96..030b229 100644
>> --- a/drivers/pci/pcie/aer/aerdrv_core.c
>> +++ b/drivers/pci/pcie/aer/aerdrv_core.c
>> @@ -215,6 +215,12 @@ static int report_error_detected(struct pci_dev *dev, void *data)
>>
>>         dev->error_state = result_data->state;
>>
>> +       if ((!dev->driver || !dev->driver->err_handler) &&
>> +               !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
>> +               dev_info(&dev->dev, "AER: Error detected but no driver has claimed this device or the driver is AER-unaware\n");
>> +               result_data->result = PCI_ERS_RESULT_NONE;
>> +               return 1;
>> +       }
>>         if (!dev->driver ||
>>                 !dev->driver->err_handler ||
>>                 !dev->driver->err_handler->error_detected) {
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
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Pandarathil, Vijaymohan R - Nov. 10, 2012, 3:40 a.m.
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Patch

diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 06bad96..030b229 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -215,6 +215,12 @@  static int report_error_detected(struct pci_dev *dev, void *data)
 
 	dev->error_state = result_data->state;
 
+	if ((!dev->driver || !dev->driver->err_handler) &&
+		!(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
+		dev_info(&dev->dev, "AER: Error detected but no driver has claimed this device or the driver is AER-unaware\n");
+		result_data->result = PCI_ERS_RESULT_NONE;
+		return 1;
+	}
 	if (!dev->driver ||
 		!dev->driver->err_handler ||
 		!dev->driver->err_handler->error_detected) {