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    Subject[PATCH v7 14/24] x86/resctrl: Allow resctrl_arch_rmid_read() to sleep
    Date
    MPAM's cache occupancy counters can take a little while to settle once
    the monitor has been configured. The maximum settling time is described
    to the driver via a firmware table. The value could be large enough
    that it makes sense to sleep. To avoid exposing this to resctrl, it
    should be hidden behind MPAM's resctrl_arch_rmid_read().

    resctrl_arch_rmid_read() may be called via IPI meaning it is unable
    to sleep. In this case resctrl_arch_rmid_read() should return an error
    if it needs to sleep. This will only affect MPAM platforms where
    the cache occupancy counter isn't available immediately, nohz_full is
    in use, and there are no housekeeping CPUs in the necessary domain.

    There are three callers of resctrl_arch_rmid_read():
    __mon_event_count() and __check_limbo() are both called from a
    non-migrateable context. mon_event_read() invokes __mon_event_count()
    using smp_call_on_cpu(), which adds work to the target CPUs workqueue.
    rdtgroup_mutex() is held, meaning this cannot race with the resctrl
    cpuhp callback. __check_limbo() is invoked via schedule_delayed_work_on()
    also adds work to a per-cpu workqueue.

    The remaining call is add_rmid_to_limbo() which is called in response
    to a user-space syscall that frees an RMID. This opportunistically
    reads the LLC occupancy counter on the current domain to see if the
    RMID is over the dirty threshold. This has to disable preemption to
    avoid reading the wrong domain's value. Disabling pre-emption here
    prevents resctrl_arch_rmid_read() from sleeping.

    add_rmid_to_limbo() walks each domain, but only reads the counter
    on one domain. If the system has more than one domain, the RMID will
    always be added to the limbo list. If the RMIDs usage was not over the
    threshold, it will be removed from the list when __check_limbo() runs.
    Make this the default behaviour. Free RMIDs are always added to the
    limbo list for each domain.

    The user visible effect of this is that a clean RMID is not available
    for re-allocation immediately after 'rmdir()' completes, this behaviour
    was never portable as it never happened on a machine with multiple
    domains.

    Removing this path allows resctrl_arch_rmid_read() to sleep if its called
    with interrupts unmasked. Document this is the expected behaviour, and
    add a might_sleep() annotation to catch changes that won't work on arm64.

    Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
    Tested-by: Peter Newman <peternewman@google.com>
    Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
    Signed-off-by: James Morse <james.morse@arm.com>
    ---
    The previous version allowed resctrl_arch_rmid_read() to be called on the
    wrong CPUs, but now that this needs to take nohz_full and housekeeping into
    account, its too complex.

    Changes since v3:
    * Removed error handling for smp_call_function_any(), this can't race
    with the cpuhp callbacks as both hold rdtgroup_mutex.
    * Switched to the alternative of removing the counter read, this simplifies
    things dramatically.

    Changes since v4:
    * Messed with capitalisation.
    * Removed some dead code now that entry->busy will never be zero in
    add_rmid_to_limbo().
    * Rephrased the comment above resctrl_arch_rmid_read_context_check().

    Changes since v5:
    * Really rephrased the comment above resctrl_arch_rmid_read_context_check().

    No changes since v6
    ---
    arch/x86/kernel/cpu/resctrl/monitor.c | 25 +++++--------------------
    include/linux/resctrl.h | 23 ++++++++++++++++++++++-
    2 files changed, 27 insertions(+), 21 deletions(-)

    diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
    index fa3319021881..409817b0ae2c 100644
    --- a/arch/x86/kernel/cpu/resctrl/monitor.c
    +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
    @@ -277,6 +277,8 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
    u64 msr_val, chunks;
    int ret;

    + resctrl_arch_rmid_read_context_check();
    +
    if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
    return -EINVAL;

    @@ -455,8 +457,6 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
    {
    struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
    struct rdt_domain *d;
    - int cpu, err;
    - u64 val = 0;
    u32 idx;

    lockdep_assert_held(&rdtgroup_mutex);
    @@ -464,17 +464,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
    idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);

    entry->busy = 0;
    - cpu = get_cpu();
    list_for_each_entry(d, &r->domains, list) {
    - if (cpumask_test_cpu(cpu, &d->cpu_mask)) {
    - err = resctrl_arch_rmid_read(r, d, entry->closid,
    - entry->rmid,
    - QOS_L3_OCCUP_EVENT_ID,
    - &val);
    - if (err || val <= resctrl_rmid_realloc_threshold)
    - continue;
    - }
    -
    /*
    * For the first limbo RMID in the domain,
    * setup up the limbo worker.
    @@ -484,15 +474,10 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
    set_bit(idx, d->rmid_busy_llc);
    entry->busy++;
    }
    - put_cpu();

    - if (entry->busy) {
    - rmid_limbo_count++;
    - if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
    - closid_num_dirty_rmid[entry->closid]++;
    - } else {
    - list_add_tail(&entry->list, &rmid_free_lru);
    - }
    + rmid_limbo_count++;
    + if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
    + closid_num_dirty_rmid[entry->closid]++;
    }

    void free_rmid(u32 closid, u32 rmid)
    diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
    index bd4ec22b5a96..8649fc84aac2 100644
    --- a/include/linux/resctrl.h
    +++ b/include/linux/resctrl.h
    @@ -236,7 +236,12 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d);
    * @eventid: eventid to read, e.g. L3 occupancy.
    * @val: result of the counter read in bytes.
    *
    - * Call from process context on a CPU that belongs to domain @d.
    + * Some architectures need to sleep when first programming some of the counters.
    + * (specifically: arm64's MPAM cache occupancy counters can return 'not ready'
    + * for a short period of time). Call from a non-migrateable process context on
    + * a CPU that belongs to domain @d. e.g. use smp_call_on_cpu() or
    + * schedule_work_on(). This function can be called with interrupts masked,
    + * e.g. using smp_call_function_any(), but may consistently return an error.
    *
    * Return:
    * 0 on success, or -EIO, -EINVAL etc on error.
    @@ -245,6 +250,22 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
    u32 closid, u32 rmid, enum resctrl_event_id eventid,
    u64 *val);

    +/**
    + * resctrl_arch_rmid_read_context_check() - warn about invalid contexts
    + *
    + * When built with CONFIG_DEBUG_ATOMIC_SLEEP generate a warning when
    + * resctrl_arch_rmid_read() is called with preemption disabled.
    + *
    + * The contract with resctrl_arch_rmid_read() is that if interrupts
    + * are unmasked, it can sleep. This allows NOHZ_FULL systems to use an
    + * IPI, (and fail if the call needed to sleep), while most of the time
    + * the work is scheduled, allowing the call to sleep.
    + */
    +static inline void resctrl_arch_rmid_read_context_check(void)
    +{
    + if (!irqs_disabled())
    + might_sleep();
    +}

    /**
    * resctrl_arch_reset_rmid() - Reset any private state associated with rmid
    --
    2.39.2
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