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    Subject[PATCH 4.9 31/76] powerpc/powernv: Query firmware for count cache flush settings
    Date
    commit 99d54754d3d5f896a8f616b0b6520662bc99d66b upstream.

    Look for fw-features properties to determine the appropriate settings
    for the count cache flush, and then call the generic powerpc code to
    set it up based on the security feature flags.

    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/powerpc/platforms/powernv/setup.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
    index 17203abf38e8..365e2b620201 100644
    --- a/arch/powerpc/platforms/powernv/setup.c
    +++ b/arch/powerpc/platforms/powernv/setup.c
    @@ -77,6 +77,12 @@ static void init_fw_feat_flags(struct device_node *np)
    if (fw_feature_is("enabled", "fw-count-cache-disabled", np))
    security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);

    + if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))
    + security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
    +
    + if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))
    + security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
    +
    /*
    * The features below are enabled by default, so we instead look to see
    * if firmware has *disabled* them, and clear them if so.
    @@ -123,6 +129,7 @@ static void pnv_setup_rfi_flush(void)
    security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));

    setup_rfi_flush(type, enable);
    + setup_count_cache_flush();
    }

    static void __init pnv_setup_arch(void)
    --
    2.19.1


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