linux-kernel - Re: [PATCH v5] PCI: quirks: update Cavium ThunderX ACS quirk implementation

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Date:   Wed, 27 Sep 2017 11:03:23 -0700
From:   Vadim Lomovtsev <Vadim.Lomovtsev@...iumnetworks.com>
To:     bhelgaas@...gle.com
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Wilson.Snyder@...ium.com, jcm@...hat.com,
        Vadim.Lomovtsev@...ium.com, alex.williamson@...hat.com
Subject: Re: [PATCH v5] PCI: quirks: update Cavium ThunderX ACS quirk
 implementation

On Tue, Sep 26, 2017 at 09:00:26AM -0700, Vadim Lomovtsev wrote:
> On Tue, Sep 26, 2017 at 09:43:43AM -0600, Alex Williamson wrote:
> > On Mon, 25 Sep 2017 06:08:40 -0700
> > Vadim Lomovtsev <Vadim.Lomovtsev@...iumnetworks.com> wrote:
> > 
> > > This commit makes Cavium PCI ACS quirk applicable only to Cavium
> > > ThunderX (CN8XXX) family PCIE Root Ports which has limited PCI capabilities
> > > in terms of no ACS support advertisement. However, the RTL internally
> > > implements similar protection as if ACS had completion/request redirection,
> > > upstream forwarding and validation features enabled.
> > > 
> > > Current quirk implementation doesn't take into account PCIERCs which
> > > also needs to be quirked. So the pci device id check mask is updated
> > > and check of device ID moved into separate function.
> > > 
> > > Signed-off-by: Vadim Lomovtsev <Vadim.Lomovtsev@...iumnetworks.com>
> > > ---
> > >  drivers/pci/quirks.c | 29 +++++++++++++++++++++--------
> > >  1 file changed, 21 insertions(+), 8 deletions(-)
> > 
> > 
> > Reviewed-by: Alex Williamson <alex.williamson@...hat.com>
> > 
> > Thanks for making the updates
> >
> 
> Thank you for your patience and for your time, Alex.
> 
> 
> 
> Bjorn,
> 
> Would you mind to pick up this patch ?
> 
> WBR,
> Vadim
> 
> > 
> > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> > > index a4d3361..0fd2e15 100644
> > > --- a/drivers/pci/quirks.c
> > > +++ b/drivers/pci/quirks.c
> > > @@ -4211,20 +4211,33 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
> > >  #endif
> > >  }
> > >  
> > > -static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
> > > +/*
> > > + * The Cavium downstream ports doesn't advertise their ACS capability registers.
> > > + * However, the RTL internally implements similar protection as if
> > > + * ACS had completion redirection, forwarding and validation features enabled.
> > > + * So by this flags we're asserting that the hardware implements and
> > > + * enables equivalent ACS functionality for these flags.
> > > + */
> > > +#define CAVIUM_CN8XXX_ACS_FLAGS (PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF)
> > > +
> > > +static __inline__  bool pci_quirk_cavium_acs_match(struct pci_dev *dev)
> > >  {
> > >  	/*
> > > -	 * Cavium devices matching this quirk do not perform peer-to-peer
> > > -	 * with other functions, allowing masking out these bits as if they
> > > -	 * were unimplemented in the ACS capability.
> > > +	 * Effectively selects all downstream ports for whole ThunderX 1 family
> > > +	 * by 0xa00 mask (which represents 8 SoCs), while the lower bits of device ID

Bjorn,

Please ignore this since I found one more typo here: it should be 0xa000, sorry. Will post v6.
Sorry for wasting your time, guys.

WBR,
Vadim


> > > +	 * are used to indicate which subdevice is used within the SoC.
> > >  	 */
> > > -	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
> > > -		       PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
> > > +	return (pci_is_pcie(dev) &&
> > > +		(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) &&
> > > +		((dev->device & 0xf800) == 0xa000));
> > > +}
> > >  
> > > -	if (!((dev->device >= 0xa000) && (dev->device <= 0xa0ff)))
> > > +static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
> > > +{
> > > +	if (!pci_quirk_cavium_acs_match(dev))
> > >  		return -ENOTTY;
> > >  
> > > -	return acs_flags ? 0 : 1;
> > > +	return acs_flags & ~(CAVIUM_CN8XXX_ACS_FLAGS) ? 0 : 1;
> > >  }
> > >  
> > >  static int pci_quirk_xgene_acs(struct pci_dev *dev, u16 acs_flags)
> >