linux-kernel - Re: [PATCH 3/5] ACPI/PCI: Add AER bits #defines for PCIE/PCI-X bridges

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Date:   Fri, 28 Oct 2022 10:31:20 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     LeoLiuoc <LeoLiu-oc@...oxin.com>
Cc:     rafael@...nel.org, lenb@...nel.org, james.morse@....com,
        tony.luck@...el.com, bp@...en8.de, robert.moore@...el.com,
        ying.huang@...el.com, rdunlap@...radead.org, bhelgaas@...gle.com,
        linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, devel@...ica.org,
        CobeChen@...oxin.com, TonyWWang@...oxin.com, ErosZhang@...oxin.com
Subject: Re: [PATCH 3/5] ACPI/PCI: Add AER bits #defines for PCIE/PCI-X
 bridges

On Fri, Oct 28, 2022 at 07:56:43PM +0800, LeoLiuoc wrote:
> 在 2022/10/28 5:56, Bjorn Helgaas 写道:
> > On Thu, Oct 27, 2022 at 11:15:54AM +0800, LeoLiu-oc wrote:
> > > From: leoliu-oc <leoliu-oc@...oxin.com>
> > > 
> > > Define PCI Express Advanced Error Reporting Extended Capabilities bits.
> > > 
> > > Signed-off-by: leoliu-oc <leoliu-oc@...oxin.com>
> > > ---
> > >   include/uapi/linux/pci_regs.h | 5 +++++
> > >   1 file changed, 5 insertions(+)
> > > 
> > > diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> > > index 57b8e2ffb1dd..3662106fd8dc 100644
> > > --- a/include/uapi/linux/pci_regs.h
> > > +++ b/include/uapi/linux/pci_regs.h
> > > @@ -799,6 +799,11 @@
> > >   #define  PCI_ERR_ROOT_AER_IRQ		0xf8000000 /* Advanced Error Interrupt Message Number */
> > >   #define PCI_ERR_ROOT_ERR_SRC	0x34	/* Error Source Identification */
> > > +/* PCI Express Advanced Error Reporting Extended Capabilities for Bridges */
> > > +#define PCI_ERR_UNCOR_MASK2		0x30	/* Secondary Uncorrectable Error Mask */
> > > +#define PCI_ERR_UNCOR_SEVER2	0x34	/* Secondary Uncorrectable Error Severit */
> > > +#define PCI_ERR_CAP2			0x38	/* Secondary Advanced Error Capabilities */
> > 
> > Can you include a spec reference for these?  I'm looking at PCIe r6.0,
> > sec 7.8.4, and I don't see anything I can match up with these.
> > 
> Please refer to PCI Express to PCI/PCI-X Bridge Specification, sec 5.2.3.2,
> 5.2.3.3 and 5.2.3.4.

Thanks, I had forgotten about that spec from 2003 :)  I wish they had
incorporated the material, or at least a reference to it, into the
PCIe base spec like they did with a lot of other similar material.

Please include a short comment in the header file, e.g.,

  /* PCIe-to-PCI/PCI-X Bridge Spec r1.0, sec 5.2.3 */