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Date: Fri, 21 Oct 2011 13:56:24 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: joerg.roedel@....com, dwmw2@...radead.org,
iommu@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org, chrisw@...hat.com, agraf@...e.de,
dwg@....ibm.com, scottwood@...escale.com, B08248@...escale.com,
benh@...nel.crashing.org, alex.williamson@...hat.com
Subject: [PATCH 4/4] iommu: Add option to group multi-function devices
The option iommu=group_mf indicates the that the iommu driver should
expose all functions of a multi-function PCI device as the same
iommu_device_group. This is useful for disallowing individual functions
being exposed as independent devices to userspace as there are often
hidden dependencies. Virtual functions are not affected by this option.
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
Documentation/kernel-parameters.txt | 4 +++-
arch/ia64/include/asm/iommu.h | 2 ++
arch/ia64/kernel/pci-dma.c | 1 +
arch/x86/include/asm/iommu.h | 1 +
arch/x86/kernel/pci-dma.c | 11 +++++++++++
drivers/iommu/amd_iommu.c | 10 +++++++++-
drivers/iommu/intel-iommu.c | 3 +++
7 files changed, 30 insertions(+), 2 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 614d038..db78b6f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1036,7 +1036,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nomerge
forcesac
soft
- pt [x86, IA-64]
+ pt [x86, IA-64]
+ group_mf [x86, IA-64]
+
io7= [HW] IO7 for Marvel based alpha systems
See comment before marvel_specify_io7 in
diff --git a/arch/ia64/include/asm/iommu.h b/arch/ia64/include/asm/iommu.h
index 745e095..196b7b2 100644
--- a/arch/ia64/include/asm/iommu.h
+++ b/arch/ia64/include/asm/iommu.h
@@ -11,8 +11,10 @@ extern int force_iommu, no_iommu;
extern int iommu_detected;
#ifdef CONFIG_DMAR
extern int iommu_pass_through;
+extern int iommu_group_mf;
#else
#define iommu_pass_through (0)
+#define iommu_group_mf (0)
#endif
extern void iommu_dma_init(void);
extern void machvec_init(const char *name);
diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index f6b1ff0..7b024c7 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c
@@ -33,6 +33,7 @@ int force_iommu __read_mostly;
#endif
int iommu_pass_through;
+int iommu_group_mf;
/* Dummy device used for NULL arguments (normally ISA). Better would
be probably a smaller DMA mask, but this is bug-to-bug compatible
diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
index 345c99c..dffc38e 100644
--- a/arch/x86/include/asm/iommu.h
+++ b/arch/x86/include/asm/iommu.h
@@ -5,6 +5,7 @@ extern struct dma_map_ops nommu_dma_ops;
extern int force_iommu, no_iommu;
extern int iommu_detected;
extern int iommu_pass_through;
+extern int iommu_group_mf;
/* 10 seconds */
#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index b49d00d..3b730fb 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -44,6 +44,15 @@ int iommu_detected __read_mostly = 0;
*/
int iommu_pass_through __read_mostly;
+/*
+ * Group multi-function PCI devices into a single device-group for the
+ * iommu_device_group interface. This tells the iommu driver to pretend
+ * it cannot distinguish between functions of a device, exposing only one
+ * group for the device. Useful for disallowing use of individual PCI
+ * functions from userspace drivers.
+ */
+int iommu_group_mf __read_mostly;
+
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
/* Dummy device used for NULL arguments (normally ISA). */
@@ -168,6 +177,8 @@ static __init int iommu_setup(char *p)
#endif
if (!strncmp(p, "pt", 2))
iommu_pass_through = 1;
+ if (!strncmp(p, "group_mf", 8))
+ iommu_group_mf = 1;
gart_parse_options(p);
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 1d82b63..6f75536 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2776,11 +2776,19 @@ static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
static int amd_iommu_device_group(struct device *dev, unsigned int *groupid)
{
struct iommu_dev_data *dev_data = dev->archdata.iommu;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ u16 devid;
if (!dev_data)
return -ENODEV;
- *groupid = amd_iommu_alias_table[dev_data->devid];
+ if (pdev->is_virtfn || !iommu_group_mf)
+ devid = dev_data->devid;
+ else
+ devid = calc_devid(pdev->bus->number,
+ PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
+
+ *groupid = amd_iommu_alias_table[devid];
return 0;
}
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index d23d66a..a5e1a2f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3939,6 +3939,9 @@ static int intel_iommu_device_group(struct device *dev, unsigned int *groupid)
}
}
+ if (!pdev->is_virtfn && iommu_group_mf)
+ id.pci.devfn = PCI_DEVFN(PCI_SLOT(id.pci.devfn), 0);
+
*groupid = id.group;
return 0;
--
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