lkml.org 
[lkml]   [2005]   [Dec]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[patch 01/19] ACPI: Add support for FADT P_LVL2_UP flag
    -stable review patch.  If anyone has any objections, please let us know.

    ------------------
    From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

    [ACPI] Add support for FADT P_LVL2_UP flag
    which tells us if C2 is valid for UP-only, or SMP.

    As there is no separate bit for C3, use P_LVL2_UP
    bit to cover both C2 and C3.

    http://bugzilla.kernel.org/show_bug.cgi?id=5165

    (cherry picked from 28b86b368af3944eb383078fc5797caf2dc8ce44 commit)

    Signed-off-by: Venkatesh Pallipadi<venkatesh.pallipadi@intel.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    drivers/acpi/processor_idle.c | 19 +++++++++++++++++++
    1 file changed, 19 insertions(+)

    --- linux-2.6.14.4.orig/drivers/acpi/processor_idle.c
    +++ linux-2.6.14.4/drivers/acpi/processor_idle.c
    @@ -261,6 +261,16 @@ static void acpi_processor_idle(void)

    cx->usage++;

    +#ifdef CONFIG_HOTPLUG_CPU
    + /*
    + * Check for P_LVL2_UP flag before entering C2 and above on
    + * an SMP system. We do it here instead of doing it at _CST/P_LVL
    + * detection phase, to work cleanly with logical CPU hotplug.
    + */
    + if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
    + !pr->flags.has_cst && acpi_fadt.plvl2_up)
    + cx->type = ACPI_STATE_C1;
    +#endif
    /*
    * Sleep:
    * ------
    @@ -527,6 +537,15 @@ static int acpi_processor_get_power_info
    pr->power.states[ACPI_STATE_C0].valid = 1;
    pr->power.states[ACPI_STATE_C1].valid = 1;

    +#ifndef CONFIG_HOTPLUG_CPU
    + /*
    + * Check for P_LVL2_UP flag before entering C2 and above on
    + * an SMP system.
    + */
    + if ((num_online_cpus() > 1) && acpi_fadt.plvl2_up)
    + return_VALUE(-ENODEV);
    +#endif
    +
    /* determine C2 and C3 address from pblk */
    pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
    pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
    --
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-12-23 23:53    [W:0.021 / U:29.720 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site