linux-kernel - Re: [PATCH] PCI/AER: Iterate over error counters instead of error strings

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Date:   Mon, 11 Jul 2022 17:54:37 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Mohamed Khalfella <mkhalfella@...estorage.com>
Cc:     stable@...r.kernel.org, Meeta Saggi <msaggi@...estorage.com>,
        Eric Badger <ebadger@...estorage.com>,
        Russell Currey <ruscur@...sell.cc>,
        Oliver O'Halloran <oohall@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "open list:PCI ENHANCED ERROR HANDLING (EEH) FOR POWERPC" 
        <linuxppc-dev@...ts.ozlabs.org>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI/AER: Iterate over error counters instead of error
 strings

On Mon, May 09, 2022 at 06:14:41PM +0000, Mohamed Khalfella wrote:
> PCI AER stats counters sysfs attributes need to iterate over
> stats counters instead of stats names. Also, added a build
> time check to make sure all counters have entries in strings
> array.
> 
> Fixes: 0678e3109a3c ("PCI/AER: Simplify __aer_print_error()")
> Cc: stable@...r.kernel.org
> Reported-by: Meeta Saggi <msaggi@...estorage.com>
> Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
> Reviewed-by: Meeta Saggi <msaggi@...estorage.com>
> Reviewed-by: Eric Badger <ebadger@...estorage.com>

I added some info about why we need this to the commit log and applied
to pci/err for v5.20.  Thank you!

> ---
>  drivers/pci/pcie/aer.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 9fa1f97e5b27..ce99a6d44786 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -533,7 +533,7 @@ static const char *aer_agent_string[] = {
>  	u64 *stats = pdev->aer_stats->stats_array;			\
>  	size_t len = 0;							\
>  									\
> -	for (i = 0; i < ARRAY_SIZE(strings_array); i++) {		\
> +	for (i = 0; i < ARRAY_SIZE(pdev->aer_stats->stats_array); i++) {\
>  		if (strings_array[i])					\
>  			len += sysfs_emit_at(buf, len, "%s %llu\n",	\
>  					     strings_array[i],		\
> @@ -1342,6 +1342,11 @@ static int aer_probe(struct pcie_device *dev)
>  	struct device *device = &dev->device;
>  	struct pci_dev *port = dev->port;
>  
> +	BUILD_BUG_ON(ARRAY_SIZE(aer_correctable_error_string) <
> +		     AER_MAX_TYPEOF_COR_ERRS);
> +	BUILD_BUG_ON(ARRAY_SIZE(aer_uncorrectable_error_string) <
> +		     AER_MAX_TYPEOF_UNCOR_ERRS);
> +
>  	/* Limit to Root Ports or Root Complex Event Collectors */
>  	if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) &&
>  	    (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT))
> -- 
> 2.29.0
>