linux-kernel - RE: [EXT] Re: [PATCH v2] PCI: endpoint: pci-epf-{,v}ntb: fix a check for no epc alignment constraint

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Message-ID: <HE1PR0401MB233126D2C7410EC5F6C3976488319@HE1PR0401MB2331.eurprd04.prod.outlook.com>
Date:   Tue, 25 Oct 2022 16:07:40 +0000
From:   Frank Li <frank.li@....com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Shunsuke Mie <mie@...l.co.jp>
CC:     Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "ntb@...ts.linux.dev" <ntb@...ts.linux.dev>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v2] PCI: endpoint: pci-epf-{,v}ntb: fix a check
 for no epc alignment constraint



> -----Original Message-----
> From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Sent: Tuesday, October 25, 2022 9:22 AM
> To: Shunsuke Mie <mie@...l.co.jp>
> Cc: Jon Mason <jdmason@...zu.us>; Dave Jiang <dave.jiang@...el.com>;
> Allen Hubbe <allenbh@...il.com>; Kishon Vijay Abraham I
> <kishon@...com>; Lorenzo Pieralisi <lpieralisi@...nel.org>; Krzysztof
> Wilczyński <kw@...ux.com>; Bjorn Helgaas <bhelgaas@...gle.com>;
> ntb@...ts.linux.dev; linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH v2] PCI: endpoint: pci-epf-{,v}ntb: fix a check for no
> epc alignment constraint
> 
> Caution: EXT Email
> 
> On Thu, Sep 22, 2022 at 06:23:57PM +0900, Shunsuke Mie wrote:
> > Some PCI endpoint controllers have no alignment constraints, and the
> > epc_features->align becomes 0. In this case, IS_ALIGNED() in

[Frank Li] why not set epc_features->align 1
no alignment constraints should mean align to byte.

> > epf_ntb_config_spad_bar_alloc() doesn't work well. Check for this before
> > IS_ALIGNED().
> >
> > Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
> 
> Reviewed-by: Manivannan Sadhasivam
> <manivannan.sadhasivam@...aro.org>
> 
> Thanks,
> Mani
> 
> > ---
> > Changes in v2:
> > * Fix the commit message in phrasings and words.
> > ---
> > ---
> >  drivers/pci/endpoint/functions/pci-epf-ntb.c  | 2 +-
> >  drivers/pci/endpoint/functions/pci-epf-vntb.c | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c
> b/drivers/pci/endpoint/functions/pci-epf-ntb.c
> > index 9a00448c7e61..f74155ee8d72 100644
> > --- a/drivers/pci/endpoint/functions/pci-epf-ntb.c
> > +++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c
> > @@ -1021,7 +1021,7 @@ static int epf_ntb_config_spad_bar_alloc(struct
> epf_ntb *ntb,
> >       peer_size = peer_epc_features->bar_fixed_size[peer_barno];
> >
> >       /* Check if epc_features is populated incorrectly */
> > -     if ((!IS_ALIGNED(size, align)))
> > +     if (align && (!IS_ALIGNED(size, align)))
> >               return -EINVAL;
> >
> >       spad_count = ntb->spad_count;
> > diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c
> b/drivers/pci/endpoint/functions/pci-epf-vntb.c
> > index 0ea85e1d292e..5e346c0a0f05 100644
> > --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
> > +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
> > @@ -418,7 +418,7 @@ static int epf_ntb_config_spad_bar_alloc(struct
> epf_ntb *ntb)
> >       size = epc_features->bar_fixed_size[barno];
> >       align = epc_features->align;
> >
> > -     if ((!IS_ALIGNED(size, align)))
> > +     if (align && !IS_ALIGNED(size, align))
> >               return -EINVAL;
> >
> >       spad_count = ntb->spad_count;
> > --
> > 2.17.1
> >
> 
> --
> மணிவண்ணன் சதாசிவம்