linux-kernel - Re: [PATCH] PCI: designware: move dw_pcie_iatu_unroll

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Date:   Tue, 24 Oct 2017 19:10:55 +0530
From:   Pankaj Dubey <pankaj.dubey@...sung.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: [PATCH] PCI: designware: move dw_pcie_iatu_unroll_enabled to pcie-designware.c

On 20 October 2017 at 23:11, Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> On Thu, Oct 12, 2017 at 10:11:08AM +0530, Pankaj Dubey wrote:
> > IATU unroll feature can be enabled in EP mode as well, so we need to
> > have this check in pcie-designware-ep.c, so instead of making this
> > function as static in pcie-desigware-host.c, let's move this in
> > pcie-designware.c so that both pcie-designware-host.c and
> > pcie-designware-ep.c can use it.
> >
> > Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
>
> This is fine with me but I'm looking for an ack from Jingoo and/or Joao.
>

Jingoo / Joao any comments on this?

>
> > ---
> >  drivers/pci/dwc/pcie-designware-ep.c   |  4 ++++
> >  drivers/pci/dwc/pcie-designware-host.c | 11 -----------
> >  drivers/pci/dwc/pcie-designware.c      | 11 +++++++++++
> >  drivers/pci/dwc/pcie-designware.h      |  1 +
> >  4 files changed, 16 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> > index d53d5f1..64803a9 100644
> > --- a/drivers/pci/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/dwc/pcie-designware-ep.c
> > @@ -314,6 +314,10 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> >       if (ep->ops->ep_init)
> >               ep->ops->ep_init(ep);
> >
> > +     pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
> > +     dev_dbg(dev, "iATU unroll: %s\n",
> > +             pci->iatu_unroll_enabled ? "enabled" : "disabled");
> > +
> >       epc = devm_pci_epc_create(dev, &epc_ops);
> >       if (IS_ERR(epc)) {
> >               dev_err(dev, "failed to create epc device\n");
> > diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
> > index 81e2157..d3f579e 100644
> > --- a/drivers/pci/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/dwc/pcie-designware-host.c
> > @@ -574,17 +574,6 @@ static struct pci_ops dw_pcie_ops = {
> >       .write = dw_pcie_wr_conf,
> >  };
> >
> > -static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
> > -{
> > -     u32 val;
> > -
> > -     val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
> > -     if (val == 0xffffffff)
> > -             return 1;
> > -
> > -     return 0;
> > -}
> > -
> >  void dw_pcie_setup_rc(struct pcie_port *pp)
> >  {
> >       u32 val;
> > diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
> > index 88abddd..f15da90 100644
> > --- a/drivers/pci/dwc/pcie-designware.c
> > +++ b/drivers/pci/dwc/pcie-designware.c
> > @@ -92,6 +92,17 @@ void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
> >               dev_err(pci->dev, "write DBI address failed\n");
> >  }
> >
> > +u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
>
> I know this is just moved verbatim, but it's more conventional to simply
> return an int (or possibly bool) for a predicate like this.  There's really
> no point in going out of your way to specify "u8" for the return type.
>

Ok, it can be done, will wait for comments from Jingoo and or Joao and
then update.

Thanks,
Pankaj


> > +{
> > +     u32 val;
> > +
> > +     val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
> > +     if (val == 0xffffffff)
> > +             return 1;
> > +
> > +     return 0;
> > +}
> > +
> >  static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
> >  {
> >       u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
> > diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
> > index e5d9d77..8d6829c 100644
> > --- a/drivers/pci/dwc/pcie-designware.h
> > +++ b/drivers/pci/dwc/pcie-designware.h
> > @@ -242,6 +242,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
> >  void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
> >                        enum dw_pcie_region_type type);
> >  void dw_pcie_setup(struct dw_pcie *pci);
> > +u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci);
> >
> >  static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
> >  {
> > --
> > 2.7.4
> >