linux-kernel - Re: [PATCH v5 09/12] PCI: endpoint: Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf

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Date:   Mon, 2 Apr 2018 20:47:01 +0200
From:   Niklas Cassel <nks@...wful.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Niklas Cassel <niklas.cassel@...s.com>,
        cyrille.pitchen@...e-electrons.com,
        Alan Douglas <adouglas@...ence.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sekhar Nori <nsekhar@...com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Niklas Cassel <niklass@...s.com>,
        John Keeping <john@...anate.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/12] PCI: endpoint: Make
 epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar

On Thu, Mar 29, 2018 at 03:30:23PM +0530, Kishon Vijay Abraham I wrote:
> Hi Niklas,
> 
> On Wednesday 28 March 2018 05:20 PM, Niklas Cassel wrote:
> > Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar.
> > 
> > This is needed so that epc->ops->clear_bar() can clear the BAR pair,
> > if the BAR is 64-bits wide.
> > 
> > This also makes it possible for pci_epc_clear_bar() to sanity check
> > the flags.
> > 
> > Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> > ---
> >  drivers/pci/cadence/pcie-cadence-ep.c         |  3 ++-
> >  drivers/pci/dwc/pcie-designware-ep.c          | 13 ++++++++++---
> >  drivers/pci/endpoint/functions/pci-epf-test.c |  5 ++++-
> >  drivers/pci/endpoint/pci-epc-core.c           |  7 ++++---
> >  include/linux/pci-epc.h                       |  5 +++--
> >  5 files changed, 23 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
> > index 2905e098678c..3d8283e450a9 100644
> > --- a/drivers/pci/cadence/pcie-cadence-ep.c
> > +++ b/drivers/pci/cadence/pcie-cadence-ep.c
> > @@ -145,10 +145,11 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
> >  }
> >  
> >  static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn,
> > -				   enum pci_barno bar)
> > +				   struct pci_epf_bar *epf_bar)
> >  {
> >  	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
> >  	struct cdns_pcie *pcie = &ep->pcie;
> > +	enum pci_barno bar = epf_bar->barno;
> >  	u32 reg, cfg, b, ctrl;
> >  
> >  	if (bar < BAR_4) {
> > diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> > index 571b90f88d84..cc4d8381c1dc 100644
> > --- a/drivers/pci/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/dwc/pcie-designware-ep.c
> > @@ -19,7 +19,8 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
> >  	pci_epc_linkup(epc);
> >  }
> >  
> > -void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
> > +static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
> > +				   int flags)
> 
> Looks like the 'flags' are not used anywhere here?

Hello Kishon,

That is correct, this patch is simply refactoring, flags is first used
in patch 11/12, since I didn't want to refactor + add new code in the
same commit.

Kind regards,
Niklas