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    Subject[PATCH 4.4 013/108] powerpc/pseries: Query hypervisor for RFI flush settings
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Michael Neuling <mikey@neuling.org>

    commit 8989d56878a7735dfdb234707a2fee6faf631085 upstream.

    A new hypervisor call is available which tells the guest settings
    related to the RFI flush. Use it to query the appropriate flush
    instruction(s), and whether the flush is required.

    Signed-off-by: Michael Neuling <mikey@neuling.org>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


    ---
    arch/powerpc/platforms/pseries/setup.c | 37 ++++++++++++++++++++++++++++++++-
    1 file changed, 36 insertions(+), 1 deletion(-)

    --- a/arch/powerpc/platforms/pseries/setup.c
    +++ b/arch/powerpc/platforms/pseries/setup.c
    @@ -499,6 +499,39 @@ static void __init find_and_init_phbs(vo
    of_pci_check_probe_only();
    }

    +static void pseries_setup_rfi_flush(void)
    +{
    + struct h_cpu_char_result result;
    + enum l1d_flush_type types;
    + bool enable;
    + long rc;
    +
    + /* Enable by default */
    + enable = true;
    +
    + rc = plpar_get_cpu_characteristics(&result);
    + if (rc == H_SUCCESS) {
    + types = L1D_FLUSH_NONE;
    +
    + if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
    + types |= L1D_FLUSH_MTTRIG;
    + if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
    + types |= L1D_FLUSH_ORI;
    +
    + /* Use fallback if nothing set in hcall */
    + if (types == L1D_FLUSH_NONE)
    + types = L1D_FLUSH_FALLBACK;
    +
    + if (!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
    + enable = false;
    + } else {
    + /* Default to fallback if case hcall is not available */
    + types = L1D_FLUSH_FALLBACK;
    + }
    +
    + setup_rfi_flush(types, enable);
    +}
    +
    static void __init pSeries_setup_arch(void)
    {
    set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
    @@ -515,7 +548,9 @@ static void __init pSeries_setup_arch(vo

    fwnmi_init();

    - /* By default, only probe PCI (can be overriden by rtas_pci) */
    + pseries_setup_rfi_flush();
    +
    + /* By default, only probe PCI (can be overridden by rtas_pci) */
    pci_add_flags(PCI_PROBE_ONLY);

    /* Find and initialize PCI host bridges */

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