linux-kernel - Re: [PATCH 2/3] PCI: iproc: CRS state check in config request

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Date:   Thu, 24 Jan 2019 14:13:29 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] PCI: iproc: CRS state check in config request

Hi Bjorn,

Thanks for review, please see my comments below inline.

On Fri, Jan 18, 2019 at 8:38 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> On Fri, Jan 18, 2019 at 09:53:22AM +0530, Srinath Mannam wrote:
> > In the current implementation, config read of 0xffff0001 data
> > is assumed as CRS completion. but sometimes 0xffff0001 can be
> > a valid data.
> > IPROC PCIe RC has a register to show config request status flags
> > like SC, UR, CRS and CA.
> > So that extra check is added in the code to confirm the CRS
> > state using this register before reissue config request.
>
> s/. but/.  But/  (Sentences start with a capital letter.)
will change. Thanks.
>
> Please wrap this text correctly.  If it's a single paragraph, wrap it so
> the lines are filled.  It *looks* like it's intended to be separate
> paragraphs; they should be separated by blank lines.
will change. Thanks.
>
> > Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
> > Reviewed-by: Ray Jui <ray.jui@...adcom.com>
> > ---
> >  drivers/pci/controller/pcie-iproc.c | 23 +++++++++++++++++++++--
> >  1 file changed, 21 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> > index 13ce80f..ee89d56 100644
> > --- a/drivers/pci/controller/pcie-iproc.c
> > +++ b/drivers/pci/controller/pcie-iproc.c
> > @@ -63,6 +63,10 @@
> >  #define APB_ERR_EN_SHIFT             0
> >  #define APB_ERR_EN                   BIT(APB_ERR_EN_SHIFT)
> >
> > +#define CFG_RD_SUCCESS                       0
> > +#define CFG_RD_UR                    1
> > +#define CFG_RD_CRS                   2
> > +#define CFG_RD_CA                    3
> >  #define CFG_RETRY_STATUS             0xffff0001
> >  #define CFG_RETRY_STATUS_TIMEOUT_US  500000 /* 500 milliseconds */
> >
> > @@ -300,6 +304,9 @@ enum iproc_pcie_reg {
> >       IPROC_PCIE_IARR4,
> >       IPROC_PCIE_IMAP4,
> >
> > +     /* config read status */
> > +     IPROC_PCIE_CFG_RD_STATUS,
> > +
> >       /* link status */
> >       IPROC_PCIE_LINK_STATUS,
> >
> > @@ -370,6 +377,7 @@ static const u16 iproc_pcie_reg_paxb_v2[] = {
> >       [IPROC_PCIE_IMAP3]              = 0xe08,
> >       [IPROC_PCIE_IARR4]              = 0xe68,
> >       [IPROC_PCIE_IMAP4]              = 0xe70,
> > +     [IPROC_PCIE_CFG_RD_STATUS]      = 0xee0,
> >       [IPROC_PCIE_LINK_STATUS]        = 0xf0c,
> >       [IPROC_PCIE_APB_ERR_EN]         = 0xf40,
> >       [IPROC_PCIE_ORDERING_CFG]       = 0x2000,
> > @@ -501,10 +509,12 @@ static void __iomem *iproc_pcie_map_ep_cfg_reg(struct iproc_pcie *pcie,
> >       return (pcie->base + offset);
> >  }
> >
> > -static unsigned int iproc_pcie_cfg_retry(void __iomem *cfg_data_p)
> > +static unsigned int iproc_pcie_cfg_retry(struct iproc_pcie *pcie,
> > +                                      void __iomem *cfg_data_p)
> >  {
> >       int timeout = CFG_RETRY_STATUS_TIMEOUT_US;
> >       unsigned int data;
> > +     u32 status;
> >
> >       /*
> >        * As per PCIe spec r3.1, sec 2.3.2, CRS Software Visibility only
> > @@ -525,6 +535,15 @@ static unsigned int iproc_pcie_cfg_retry(void __iomem *cfg_data_p)
> >        */
> >       data = readl(cfg_data_p);
> >       while (data == CFG_RETRY_STATUS && timeout--) {
> > +             /*
> > +              * CRS state is set in CFG_RD status register
> > +              * This will handle the case where CFG_RETRY_STATUS is
> > +              * valid config data.
> > +              */
> > +             status = iproc_pcie_read_reg(pcie, IPROC_PCIE_CFG_RD_STATUS);
> > +             if (status != CFG_RD_CRS)
> > +                     return data;
> > +
> >               udelay(1);
> >               data = readl(cfg_data_p);
> >       }
> > @@ -603,7 +622,7 @@ static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
> >       if (!cfg_data_p)
> >               return PCIBIOS_DEVICE_NOT_FOUND;
> >
> > -     data = iproc_pcie_cfg_retry(cfg_data_p);
> > +     data = iproc_pcie_cfg_retry(pcie, cfg_data_p);
> >
> >       *val = data;
> >       if (size <= 2)
> > --
> > 2.7.4
> >