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    Subject[PATCH V7 09/41] x86/intel_rdt: Introduce new "exclusive" mode
    Date
    At the moment all allocations are shareable. There is no way for a user to
    designate that an allocation associated with a resource group cannot be
    shared by another.

    Introduce the new mode "exclusive". When a resource group is marked as such
    it implies that no overlap is allowed between its allocation and that of
    another resource group.

    Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: fenghua.yu@intel.com
    Cc: tony.luck@intel.com
    Cc: vikas.shivappa@linux.intel.com
    Cc: gavin.hindman@intel.com
    Cc: jithu.joseph@intel.com
    Cc: dave.hansen@intel.com
    Cc: hpa@zytor.com
    Link: https://lkml.kernel.org/r/cea76188c5b30cffaf89ad5c7efd66a3e7f105d4.1527593970.git.reinette.chatre@intel.com
    ---
    arch/x86/kernel/cpu/intel_rdt.h | 2 ++
    arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 1 +
    2 files changed, 3 insertions(+)

    diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
    index 5f3915c2e599..399bb94e865b 100644
    --- a/arch/x86/kernel/cpu/intel_rdt.h
    +++ b/arch/x86/kernel/cpu/intel_rdt.h
    @@ -83,6 +83,7 @@ enum rdt_group_type {
    /**
    * enum rdtgrp_mode - Mode of a RDT resource group
    * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
    + * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
    *
    * The mode of a resource group enables control over the allowed overlap
    * between allocations associated with different resource groups (classes
    @@ -91,6 +92,7 @@ enum rdt_group_type {
    */
    enum rdtgrp_mode {
    RDT_MODE_SHAREABLE = 0,
    + RDT_MODE_EXCLUSIVE,

    /* Must be last */
    RDT_NUM_MODES,
    diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
    index 7c2487cd74b5..0bee382fcad5 100644
    --- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
    +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
    @@ -161,6 +161,7 @@ enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)

    static const char * const rdt_mode_str[] = {
    [RDT_MODE_SHAREABLE] = "shareable",
    + [RDT_MODE_EXCLUSIVE] = "exclusive",
    };

    /**
    --
    2.17.0
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