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    Subject[PATCH 3.11 032/233] perf/x86/amd/ibs: Fix waking up from S3 for AMD family 10h
    Date
    3.11.10.4 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Robert Richter <rric@kernel.org>

    commit bee09ed91cacdbffdbcd3b05de8409c77ec9fcd6 upstream.

    On AMD family 10h we see following error messages while waking up from
    S3 for all non-boot CPUs leading to a failed IBS initialization:

    Enabling non-boot CPUs ...
    smpboot: Booting Node 0 Processor 1 APIC 0x1
    [Firmware Bug]: cpu 1, try to use APIC500 (LVT offset 0) for vector 0x400, but the register is already in use for vector 0xf9 on another cpu
    perf: IBS APIC setup failed on cpu #1
    process: Switch to broadcast mode on CPU1
    CPU1 is up
    ...
    ACPI: Waking up from system sleep state S3

    Reason for this is that during suspend the LVT offset for the IBS
    vector gets lost and needs to be reinialized while resuming.

    The offset is read from the IBSCTL msr. On family 10h the offset needs
    to be 1 as offset 0 is used for the MCE threshold interrupt, but
    firmware assings it for IBS to 0 too. The kernel needs to reprogram
    the vector. The msr is a readonly node msr, but a new value can be
    written via pci config space access. The reinitialization is
    implemented for family 10h in setup_ibs_ctl() which is forced during
    IBS setup.

    This patch fixes IBS setup after waking up from S3 by adding
    resume/supend hooks for the boot cpu which does the offset
    reinitialization.

    Marking it as stable to let distros pick up this fix.

    Signed-off-by: Robert Richter <rric@kernel.org>
    Signed-off-by: Peter Zijlstra <peterz@infradead.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Link: http://lkml.kernel.org/r/1389797849-5565-1-git-send-email-rric.net@gmail.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    arch/x86/kernel/cpu/perf_event_amd_ibs.c | 53 +++++++++++++++++++++++++++-----
    1 file changed, 45 insertions(+), 8 deletions(-)

    diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
    index e09f0bf..4b8e4d3 100644
    --- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c
    +++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
    @@ -10,6 +10,7 @@
    #include <linux/module.h>
    #include <linux/pci.h>
    #include <linux/ptrace.h>
    +#include <linux/syscore_ops.h>

    #include <asm/apic.h>

    @@ -816,6 +817,18 @@ out:
    return ret;
    }

    +static void ibs_eilvt_setup(void)
    +{
    + /*
    + * Force LVT offset assignment for family 10h: The offsets are
    + * not assigned by the BIOS for this family, so the OS is
    + * responsible for doing it. If the OS assignment fails, fall
    + * back to BIOS settings and try to setup this.
    + */
    + if (boot_cpu_data.x86 == 0x10)
    + force_ibs_eilvt_setup();
    +}
    +
    static inline int get_ibs_lvt_offset(void)
    {
    u64 val;
    @@ -851,6 +864,36 @@ static void clear_APIC_ibs(void *dummy)
    setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1);
    }

    +#ifdef CONFIG_PM
    +
    +static int perf_ibs_suspend(void)
    +{
    + clear_APIC_ibs(NULL);
    + return 0;
    +}
    +
    +static void perf_ibs_resume(void)
    +{
    + ibs_eilvt_setup();
    + setup_APIC_ibs(NULL);
    +}
    +
    +static struct syscore_ops perf_ibs_syscore_ops = {
    + .resume = perf_ibs_resume,
    + .suspend = perf_ibs_suspend,
    +};
    +
    +static void perf_ibs_pm_init(void)
    +{
    + register_syscore_ops(&perf_ibs_syscore_ops);
    +}
    +
    +#else
    +
    +static inline void perf_ibs_pm_init(void) { }
    +
    +#endif
    +
    static int
    perf_ibs_cpu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
    {
    @@ -877,18 +920,12 @@ static __init int amd_ibs_init(void)
    if (!caps)
    return -ENODEV; /* ibs not supported by the cpu */

    - /*
    - * Force LVT offset assignment for family 10h: The offsets are
    - * not assigned by the BIOS for this family, so the OS is
    - * responsible for doing it. If the OS assignment fails, fall
    - * back to BIOS settings and try to setup this.
    - */
    - if (boot_cpu_data.x86 == 0x10)
    - force_ibs_eilvt_setup();
    + ibs_eilvt_setup();

    if (!ibs_eilvt_valid())
    goto out;

    + perf_ibs_pm_init();
    get_online_cpus();
    ibs_caps = caps;
    /* make ibs_caps visible to other cpus: */
    --
    1.8.3.2


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