linux-kernel - Re: [PATCH 0/4] iommu: iommu

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Date:	Fri, 21 Oct 2011 16:34:32 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	"Woodhouse, David" <david.woodhouse@...el.com>
Cc:	"joerg.roedel@....com" <joerg.roedel@....com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"chrisw@...hat.com" <chrisw@...hat.com>,
	"agraf@...e.de" <agraf@...e.de>,
	"dwg@....ibm.com" <dwg@....ibm.com>,
	"scottwood@...escale.com" <scottwood@...escale.com>,
	"B08248@...escale.com" <B08248@...escale.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>
Subject: Re: [PATCH 0/4] iommu: iommu_ops group interface

On Fri, 2011-10-21 at 15:16 -0600, Alex Williamson wrote:
> On Fri, 2011-10-21 at 20:34 +0000, Woodhouse, David wrote:
> > On Fri, 2011-10-21 at 13:55 -0600, Alex Williamson wrote:
> > > IOMMUs can't always distiguish transactions from each individual
> > > device in a system.  Sometimes this is by design (such as powerpc
> > > partitionable endpoints), other times by topology (PCIe-to-PCI
> > > bridges masking downstream devices).  We call these sets of
> > > indistinguishable devices "groups". 
> > 
> > Other times it's because a multi-function PCIe device is broken and does
> > all its DMA from function zero.... like some Ricoh devices seen in
> > laptops. Can you handle quirks to "group" those too?
> 
> I could add:
> 
> drivers/pci/quirks.c: int pci_iommu_group_mf_quirk(struct pci_dev *)
> 
> That's used just like iommu_group_mf to always blacklist specific
> devices.  Let me know VID/DID if you have them.  Thanks,

I guess just a bit and a quirk is easiest, something like below
(quirking an 82576 just as an example).  Thanks,

Alex

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 6f75536..de158d9 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2782,11 +2782,11 @@ static int amd_iommu_device_group(struct device *dev, unsigned int *groupid)
 	if (!dev_data)
 		return -ENODEV;
 
-	if (pdev->is_virtfn || !iommu_group_mf)
-		devid = dev_data->devid;
-	else
+	if (pdev->group_mf || (iommu_group_mf && !pdev->is_virtfn))
 		devid = calc_devid(pdev->bus->number,
 				   PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
+	else
+		devid = dev_data->devid;
 
 	*groupid = amd_iommu_alias_table[devid];
 
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a5e1a2f..fba0256 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3939,7 +3939,7 @@ static int intel_iommu_device_group(struct device *dev, unsigned int *groupid)
 		}
 	}
 
-	if (!pdev->is_virtfn && iommu_group_mf)
+	if (pdev->group_mf || (iommu_group_mf && !pdev->is_virtfn))
 		id.pci.devfn = PCI_DEVFN(PCI_SLOT(id.pci.devfn), 0);
 
 	*groupid = id.group;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 1196f61..4764645 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3009,3 +3009,9 @@ int pci_dev_specific_reset(struct pci_dev *dev, int probe)
 
 	return -ENOTTY;
 }
+
+static void __devinit quirk_iommu_group_mf(struct pci_dev* dev)
+{
+	dev->group_mf = 1;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x10c9, quirk_iommu_group_mf);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8c230cb..d763027 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -322,6 +322,7 @@ struct pci_dev {
 	unsigned int    is_hotplug_bridge:1;
 	unsigned int    __aer_firmware_first_valid:1;
 	unsigned int	__aer_firmware_first:1;
+	unsigned int	group_mf:1;	/* per device iommu=group_mf */
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 



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