Linux-PCI Archive on lore.kernel.org
 help / color / Atom feed
From: Rajat Jain <rajatja@google.com>
To: "Raj, Ashok" <ashok.raj@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Joerg Roedel <joro@8bytes.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	iommu@lists.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-pci <linux-pci@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	"Krishnakumar,
	Lalithambika" <lalithambika.krishnakumar@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Prashant Malani <pmalani@google.com>,
	Benson Leung <bleung@google.com>, Todd Broch <tbroch@google.com>,
	Alex Levin <levinale@google.com>,
	Mattias Nissler <mnissler@google.com>,
	Rajat Jain <rajatxjain@gmail.com>,
	Bernie Keany <bernie.keany@intel.com>,
	Aaron Durbin <adurbin@google.com>,
	Diego Rivas <diegorivas@google.com>,
	Duncan Laurie <dlaurie@google.com>,
	Furquan Shaikh <furquan@google.com>,
	Jesse Barnes <jsbarnes@google.com>,
	Christian Kellner <christian@kellner.me>,
	Alex Williamson <alex.williamson@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Oliver O'Halloran" <oohall@gmail.com>
Subject: Re: [PATCH 3/4] pci: acs: Enable PCI_ACS_TB for untrusted/external-facing devices
Date: Mon, 22 Jun 2020 16:01:34 -0700
Message-ID: <CACK8Z6FZ560vfMYH8idaea31_9dq4Vvo7LiMASnxZKZJtX89wg@mail.gmail.com> (raw)
In-Reply-To: <20200619161009.GH42799@otc-nc-03>

Hi Ashok,

On Fri, Jun 19, 2020 at 9:10 AM Raj, Ashok <ashok.raj@intel.com> wrote:
>
> Hi Rajat
>
>
> On Mon, Jun 15, 2020 at 06:17:41PM -0700, Rajat Jain wrote:
> > When enabling ACS, currently the bit "translation blocking" was
> > not getting changed at all. Set it to disable translation blocking
>
> Maybe you meant "enable translation blocking" ?

Oops, yes.

>
> Keep the commit log simple:
>
> When enabling ACS, enable translation blocking for external facing ports
> and untrusted devices.

Ack. Will change in the next iteration (currently waiting to see if
there are any more comments).

Thanks & Regards,

Rajat

>
> > too for all external facing or untrusted devices. This is OK
> > because ATS is only allowed on internal devces.
> >
> > Signed-off-by: Rajat Jain <rajatja@google.com>
> > ---
> >  drivers/pci/pci.c    |  4 ++++
> >  drivers/pci/quirks.c | 11 +++++++++++
> >  2 files changed, 15 insertions(+)
> >
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index d2ff987585855..79853b52658a2 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -3330,6 +3330,10 @@ static void pci_std_enable_acs(struct pci_dev *dev)
> >       /* Upstream Forwarding */
> >       ctrl |= (cap & PCI_ACS_UF);
> >
> > +     if (dev->external_facing || dev->untrusted)
> > +             /* Translation Blocking */
> > +             ctrl |= (cap & PCI_ACS_TB);
> > +
> >       pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
> >  }
> >
> > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> > index b341628e47527..6294adeac4049 100644
> > --- a/drivers/pci/quirks.c
> > +++ b/drivers/pci/quirks.c
> > @@ -4934,6 +4934,13 @@ static void pci_quirk_enable_intel_rp_mpc_acs(struct pci_dev *dev)
> >       }
> >  }
> >
> > +/*
> > + * Currently this quirk does the equivalent of
> > + * PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_SV
> > + *
> > + * Currently missing, it also needs to do equivalent of PCI_ACS_TB,
> > + * if dev->external_facing || dev->untrusted
> > + */
> >  static int pci_quirk_enable_intel_pch_acs(struct pci_dev *dev)
> >  {
> >       if (!pci_quirk_intel_pch_acs_match(dev))
> > @@ -4973,6 +4980,10 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev)
> >       ctrl |= (cap & PCI_ACS_CR);
> >       ctrl |= (cap & PCI_ACS_UF);
> >
> > +     if (dev->external_facing || dev->untrusted)
> > +             /* Translation Blocking */
> > +             ctrl |= (cap & PCI_ACS_TB);
> > +
> >       pci_write_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, ctrl);
> >
> >       pci_info(dev, "Intel SPT PCH root port ACS workaround enabled\n");
> > --
> > 2.27.0.290.gba653c62da-goog
> >

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16  1:17 [PATCH 1/4] pci: Keep the ACS capability offset in device Rajat Jain
2020-06-16  1:17 ` [PATCH 2/4] pci: set "untrusted" flag for truly external devices only Rajat Jain
2020-06-16  9:07   ` Mika Westerberg
2020-06-16  1:17 ` [PATCH 3/4] pci: acs: Enable PCI_ACS_TB for untrusted/external-facing devices Rajat Jain
2020-06-19 16:10   ` Raj, Ashok
2020-06-22 23:01     ` Rajat Jain [this message]
2020-06-16  1:17 ` [PATCH 4/4] pci: export untrusted attribute in sysfs Rajat Jain
2020-06-16  5:57   ` Greg Kroah-Hartman
2020-06-16  7:32   ` Christoph Hellwig
2020-06-16 19:27     ` Rajat Jain
2020-06-17  7:31       ` Christoph Hellwig
2020-06-17 19:53         ` Rajat Jain
2020-06-18  6:18           ` Greg Kroah-Hartman
2020-06-18  8:12           ` Andy Shevchenko
2020-06-18  8:36             ` Greg Kroah-Hartman
2020-06-18  9:14               ` Andy Shevchenko
2020-06-18 14:56                 ` Greg Kroah-Hartman
2020-06-18 15:03                 ` Rajat Jain
2020-06-18 15:39                   ` Andy Shevchenko
2020-06-18 16:02                   ` Greg Kroah-Hartman
2020-06-18 16:23                     ` Raj, Ashok
2020-06-18 17:23                       ` Rajat Jain
2020-06-18 18:46                         ` Greg Kroah-Hartman
2020-06-18 23:58   ` Rajat Jain

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CACK8Z6FZ560vfMYH8idaea31_9dq4Vvo7LiMASnxZKZJtX89wg@mail.gmail.com \
    --to=rajatja@google.com \
    --cc=adurbin@google.com \
    --cc=alex.williamson@redhat.com \
    --cc=ashok.raj@intel.com \
    --cc=baolu.lu@linux.intel.com \
    --cc=bernie.keany@intel.com \
    --cc=bhelgaas@google.com \
    --cc=bleung@google.com \
    --cc=christian@kellner.me \
    --cc=diegorivas@google.com \
    --cc=dlaurie@google.com \
    --cc=dwmw2@infradead.org \
    --cc=furquan@google.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=iommu@lists.linux-foundation.org \
    --cc=jean-philippe@linaro.org \
    --cc=joro@8bytes.org \
    --cc=jsbarnes@google.com \
    --cc=lalithambika.krishnakumar@intel.com \
    --cc=lenb@kernel.org \
    --cc=levinale@google.com \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=mika.westerberg@linux.intel.com \
    --cc=mnissler@google.com \
    --cc=oohall@gmail.com \
    --cc=pmalani@google.com \
    --cc=rajatxjain@gmail.com \
    --cc=rjw@rjwysocki.net \
    --cc=tbroch@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PCI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-pci/0 linux-pci/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pci linux-pci/ https://lore.kernel.org/linux-pci \
		linux-pci@vger.kernel.org
	public-inbox-index linux-pci

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pci


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git