linux-kernel - Re: [PATCH v5 07/12] PCI: cadence: Set PCI_BASE_ADDRESS_MEM_TYPE

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Date:   Wed, 28 Mar 2018 14:37:17 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Alan Douglas <adouglas@...ence.com>
Cc:     Niklas Cassel <niklas.cassel@...s.com>,
        "kishon@...com" <kishon@...com>,
        "cyrille.pitchen@...e-electrons.com" 
        <cyrille.pitchen@...e-electrons.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Niklas Cassel <niklass@...s.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v5 07/12] PCI: cadence: Set PCI_BASE_ADDRESS_MEM_TYPE_64
 if a 64-bit BAR was set-up

[+cc Lorenzo]

On Wed, Mar 28, 2018 at 01:24:10PM +0000, Alan Douglas wrote:
> > On 28/03/2018 12:51, Niklas Cassel wrote:
> > cdns_pcie_ep_set_bar() does some round-up of the BAR size, which means that a 64-bit BAR can be set-up, even when the flag
> > PCI_BASE_ADDRESS_MEM_TYPE_64 isn't set.
> 
> > If a 64-bit BAR was set-up, set the flag PCI_BASE_ADDRESS_MEM_TYPE_64, so that the calling function can know what BAR width that was actually set-up.
> 
> > I'm not sure why cdns_pcie_ep_set_bar() doesn't obey the flag PCI_BASE_ADDRESS_MEM_TYPE_64, but I leave this for the MAINTAINER to fix, since there might be a reason why > this flag is ignored.
> Will investigate and fix this in future patch
> 
> > Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> > ---
> >  drivers/pci/cadence/pcie-cadence-ep.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
> > index cef36cd6b710..2905e098678c 100644
> > --- a/drivers/pci/cadence/pcie-cadence-ep.c
> > +++ b/drivers/pci/cadence/pcie-cadence-ep.c
> > @@ -106,6 +106,9 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
> >  		if (is_64bits && (bar & 1))
> >  			return -EINVAL;
> >  
> > +		if (is_64bits && !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
> > +			epf_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
> > +
> >  		if (is_64bits && is_prefetch)
> >  			ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
> >  		else if (is_prefetch)
> > --
> > 2.14.2
> Change looks good to me.

It will be helpful to Lorenzo if you spell this out, e.g.,

  Acked-by: Alan Douglas <adouglas@...ence.com>

Also, it looks like we need a MAINTAINERS update to add
drivers/pci/cadence/ to the "PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS"
filename patterns.