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    Subject[PATCH v2 7/7] iommu: Remove group_mf
    Date
    The iommu=group_mf is really no longer needed with the addition of ACS
    support in IOMMU drivers creating groups. Most multifunction devices
    will now be grouped already. If a device has gone to the trouble of
    exposing ACS, trust that it works. We can use the device specific ACS
    function for fixing devices we trust individually. This largely
    reverts bcb71abe.

    Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
    ---

    Documentation/kernel-parameters.txt | 1 -
    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 -----------
    5 files changed, 16 deletions(-)

    diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
    index 0ea6d04..1e38ef3 100644
    --- a/Documentation/kernel-parameters.txt
    +++ b/Documentation/kernel-parameters.txt
    @@ -1128,7 +1128,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
    forcesac
    soft
    pt [x86, IA-64]
    - group_mf [x86, IA-64]


    io7= [HW] IO7 for Marvel based alpha systems
    diff --git a/arch/ia64/include/asm/iommu.h b/arch/ia64/include/asm/iommu.h
    index b6a809f..105c93b 100644
    --- a/arch/ia64/include/asm/iommu.h
    +++ b/arch/ia64/include/asm/iommu.h
    @@ -11,12 +11,10 @@ extern void no_iommu_init(void);
    extern int force_iommu, no_iommu;
    extern int iommu_pass_through;
    extern int iommu_detected;
    -extern int iommu_group_mf;
    #else
    #define iommu_pass_through (0)
    #define no_iommu (1)
    #define iommu_detected (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 7cdc89b..1ddcfe5 100644
    --- a/arch/ia64/kernel/pci-dma.c
    +++ b/arch/ia64/kernel/pci-dma.c
    @@ -32,7 +32,6 @@ 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 dffc38e..345c99c 100644
    --- a/arch/x86/include/asm/iommu.h
    +++ b/arch/x86/include/asm/iommu.h
    @@ -5,7 +5,6 @@ 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 62c9457..ac8f823 100644
    --- a/arch/x86/kernel/pci-dma.c
    +++ b/arch/x86/kernel/pci-dma.c
    @@ -45,15 +45,6 @@ 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). */
    @@ -193,8 +184,6 @@ 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);



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