Re: [PATCH v2 2/8] powerpc/eeh: More relexed hotplug criterion

[Daniel Axtens <dja@axtens.net>]

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Gavin Shan <gwshan@linux.vnet.ibm.com> writes:

Hi Gavin,

> Currently, we rely on the existence of struct pci_driver::err_handler
> to judge if the corresponding PCI device should be unplugged during
> EEH recovery (partially hotplug case). However, it's not elaborate.
> some device drivers are implementing part of the EEH error handlers
> to collect diag-data. That means the driver still expects a hotplug
> to recover from the EEH error.


> This makes the hotplug criterion more relaxed: if the device driver
> doesn't provide all necessary EEH error handlers, it will experience
> hotplug during EEH recovery.

Interesting.

My understanding of Documentation/PCI/pci-error-recovery.txt is that a
driver should be able to just supply an error_detected() callback. If
the driver just wants to collect diag-data and wants to be hotplugged,
it should return PCI_ERS_RESULT_NONE.

What drivers did you have in mind?

Regards,
Daniel

>
> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
> ---
>  arch/powerpc/kernel/eeh_driver.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
> index 3a626ed..32178a4 100644
> --- a/arch/powerpc/kernel/eeh_driver.c
> +++ b/arch/powerpc/kernel/eeh_driver.c
> @@ -416,7 +416,10 @@ static void *eeh_rmv_device(void *data, void *userdata)
>  	driver = eeh_pcid_get(dev);
>  	if (driver) {
>  		eeh_pcid_put(dev);
> -		if (driver->err_handler)
> +		if (driver->err_handler &&
> +		    driver->err_handler->error_detected &&
> +		    driver->err_handler->slot_reset &&
> +		    driver->err_handler->resume)
>  			return NULL;
>  	}
>  
> -- 
> 2.1.0
>
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