linux-kernel - Re: [RESEND 2/5] PCIe, AER: Replenish missed AER status bits for AER driver

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Date:	Tue, 9 Sep 2014 03:03:22 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	rdunlap@...radead.org, bp@...en8.de, tony.luck@...el.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND 2/5] PCIe, AER: Replenish missed AER status bits for AER
 driver

On Fri, Sep 05, 2014 at 05:15:43PM -0600, Bjorn Helgaas wrote:
> Date: Fri, 5 Sep 2014 17:15:43 -0600
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> To: "Chen, Gong" <gong.chen@...ux.intel.com>
> Cc: rdunlap@...radead.org, bp@...en8.de, tony.luck@...el.com,
>  linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
> Subject: Re: [RESEND 2/5] PCIe, AER: Replenish missed AER status bits for
>  AER driver
> User-Agent: Mutt/1.5.21 (2010-09-15)
> 
> On Wed, Aug 13, 2014 at 02:22:38AM -0400, Chen, Gong wrote:
> > Since commit 6c2b374d is commited, the capability of PCI-e AER
> > has changed a lot. This patch adds all missed CE/UC error bits
> > existed in PCI-e SPEC r3.0. Meanwhile, adjust the code format
> > to make it simpler to read/maintain.
> > 
> > Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>
> > ---
> >  drivers/pci/pcie/aer/aerdrv_errprint.c | 60 ++++++++++++++--------------------
> >  1 file changed, 25 insertions(+), 35 deletions(-)
> > 
> > diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
> > index 35d06e177917..5c4f7e252e5e 100644
> > --- a/drivers/pci/pcie/aer/aerdrv_errprint.c
> > +++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
> > @@ -75,44 +75,34 @@ static const char *aer_error_layer[] = {
> >  };
> >  
> >  static const char *aer_correctable_error_string[] = {
> > -	"Receiver Error",		/* Bit Position 0	*/
> > -	NULL,
> > -	NULL,
> > -	NULL,
> > -	NULL,
> > -	NULL,
> > -	"Bad TLP",			/* Bit Position 6	*/
> > -	"Bad DLLP",			/* Bit Position 7	*/
> > -	"RELAY_NUM Rollover",		/* Bit Position 8	*/
> > -	NULL,
> > -	NULL,
> > -	NULL,
> > -	"Replay Timer Timeout",		/* Bit Position 12	*/
> > -	"Advisory Non-Fatal",		/* Bit Position 13	*/
> > +	[0] = "Receiver Error",
> > +	[6] = "Bad TLP",
> > +	[7] = "Bad DLLP",
> > +	[8] = "RELAY_NUM Rollover",
> > +	[12] = "Replay Timer Timeout",
> > +	[13] = "Advisory Non-Fatal Error",
> > +	[14] = "Corrected Internal Error",
> > +	[15] = "Header Log Overflow",
> 
> You replaced bare numbers with the existing #defines in the previous patch
> (thank you), but now we're adding them here.  I'm pretty sure you can use
> the #defines here, e.g.,
> 
>     [PCI_ERR_COR_RCVR] = "Receiver Error",
Considering PCI_ERR_COR_* stuff are not BIT offset, I need a conversion like
[ilog2(PCI_ERR_COR_RCVR)] = "xxx". But in ras_event.h I need the same
conversion like aer_correctable_error_string[ilog2(PCI_ERR_COR_RCVR)]. It looks
like a little bit clumsy and suboptimal. I can add extra BIT definition in
include/uapi/linux/pci_regs.h like below:

#define  PCI_ERR_COR_RCVR       0x00000001      /* Receiver Error Status */
+#define  PCI_ERR_COR_RCVR_BIT   ilog2(PCI_ERR_COR_RCVR)

or more direct way:
#define  PCI_ERR_COR_RCVR       0x00000001      /* Receiver Error Status */
+#define  PCI_ERR_COR_RCVR_BIT   0

I can't find better method by now.
> 
> In fact, it would be really nice if you could figure out a way to have only
> one set of these strings.  Right now, we have the set in
As above implied, I can export aer_correctable_error_string etc.

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