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    Subject[PATCH 4.14 040/496] powerpc/rfi-flush: Differentiate enabled and patched flush types
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>

    commit 0063d61ccfc011f379a31acaeba6de7c926fed2c upstream.

    Currently the rfi-flush messages print 'Using <type> flush' for all
    enabled_flush_types, but that is not necessarily true -- as now the
    fallback flush is always enabled on pseries, but the fixup function
    overwrites its nop/branch slot with other flush types, if available.

    So, replace the 'Using <type> flush' messages with '<type> flush is
    available'.

    Also, print the patched flush types in the fixup function, so users
    can know what is (not) being used (e.g., the slower, fallback flush,
    or no flush type at all if flush is disabled via the debugfs switch).

    Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/powerpc/kernel/setup_64.c | 6 +++---
    arch/powerpc/lib/feature-fixups.c | 9 ++++++++-
    2 files changed, 11 insertions(+), 4 deletions(-)

    --- a/arch/powerpc/kernel/setup_64.c
    +++ b/arch/powerpc/kernel/setup_64.c
    @@ -860,15 +860,15 @@ static void init_fallback_flush(void)
    void setup_rfi_flush(enum l1d_flush_type types, bool enable)
    {
    if (types & L1D_FLUSH_FALLBACK) {
    - pr_info("rfi-flush: Using fallback displacement flush\n");
    + pr_info("rfi-flush: fallback displacement flush available\n");
    init_fallback_flush();
    }

    if (types & L1D_FLUSH_ORI)
    - pr_info("rfi-flush: Using ori type flush\n");
    + pr_info("rfi-flush: ori type flush available\n");

    if (types & L1D_FLUSH_MTTRIG)
    - pr_info("rfi-flush: Using mttrig type flush\n");
    + pr_info("rfi-flush: mttrig type flush available\n");

    enabled_flush_types = types;

    --- a/arch/powerpc/lib/feature-fixups.c
    +++ b/arch/powerpc/lib/feature-fixups.c
    @@ -153,7 +153,14 @@ void do_rfi_flush_fixups(enum l1d_flush_
    patch_instruction(dest + 2, instrs[2]);
    }

    - printk(KERN_DEBUG "rfi-flush: patched %d locations\n", i);
    + printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
    + (types == L1D_FLUSH_NONE) ? "no" :
    + (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
    + (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
    + ? "ori+mttrig type"
    + : "ori type" :
    + (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
    + : "unknown");
    }
    #endif /* CONFIG_PPC_BOOK3S_64 */


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