diff options
author | Kan Liang <kan.liang@linux.intel.com> | 2019-04-30 17:53:45 -0700 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2019-06-17 12:36:19 +0200 |
commit | c8872d90e0a3651a096860d3241625ccfa1647e0 (patch) | |
tree | 75b43ca2116423e9c63e3fe22b87cf5d986e8dd6 | |
parent | 210cc5f9db7a5c66b7ca6290b7d35cc7db7e9dbd (diff) |
perf/x86/intel/uncore: Factor out box ref/unref functions
For uncore box which can only be accessed by MSR, its reference
box->refcnt is updated in CPU hot plug. The uncore boxes need to be
initalized and exited accordingly for the first/last CPU of a socket.
Starts from Snow Ridge server, a new type of uncore box is introduced,
which can only be accessed by MMIO. The driver needs to map/unmap
MMIO space for the first/last CPU of a socket.
Extract the codes of box ref/unref and init/exit for reuse later.
There is no functional change.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@kernel.org
Cc: eranian@google.com
Link: https://lkml.kernel.org/r/1556672028-119221-4-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r-- | arch/x86/events/intel/uncore.c | 54 |
1 files changed, 36 insertions, 18 deletions
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c index 342c323e0f6a..7b0c88903d47 100644 --- a/arch/x86/events/intel/uncore.c +++ b/arch/x86/events/intel/uncore.c @@ -1143,12 +1143,27 @@ static void uncore_change_context(struct intel_uncore_type **uncores, uncore_change_type_ctx(*uncores, old_cpu, new_cpu); } -static int uncore_event_cpu_offline(unsigned int cpu) +static void uncore_box_unref(struct intel_uncore_type **types, int id) { - struct intel_uncore_type *type, **types = uncore_msr_uncores; + struct intel_uncore_type *type; struct intel_uncore_pmu *pmu; struct intel_uncore_box *box; - int i, die, target; + int i; + + for (; *types; types++) { + type = *types; + pmu = type->pmus; + for (i = 0; i < type->num_boxes; i++, pmu++) { + box = pmu->boxes[id]; + if (box && atomic_dec_return(&box->refcnt) == 0) + uncore_box_exit(box); + } + } +} + +static int uncore_event_cpu_offline(unsigned int cpu) +{ + int die, target; /* Check if exiting cpu is used for collecting uncore events */ if (!cpumask_test_and_clear_cpu(cpu, &uncore_cpu_mask)) @@ -1168,15 +1183,7 @@ static int uncore_event_cpu_offline(unsigned int cpu) unref: /* Clear the references */ die = topology_logical_die_id(cpu); - for (; *types; types++) { - type = *types; - pmu = type->pmus; - for (i = 0; i < type->num_boxes; i++, pmu++) { - box = pmu->boxes[die]; - if (box && atomic_dec_return(&box->refcnt) == 0) - uncore_box_exit(box); - } - } + uncore_box_unref(uncore_msr_uncores, die); return 0; } @@ -1219,15 +1226,15 @@ cleanup: return -ENOMEM; } -static int uncore_event_cpu_online(unsigned int cpu) +static int uncore_box_ref(struct intel_uncore_type **types, + int id, unsigned int cpu) { - struct intel_uncore_type *type, **types = uncore_msr_uncores; + struct intel_uncore_type *type; struct intel_uncore_pmu *pmu; struct intel_uncore_box *box; - int i, ret, die, target; + int i, ret; - die = topology_logical_die_id(cpu); - ret = allocate_boxes(types, die, cpu); + ret = allocate_boxes(types, id, cpu); if (ret) return ret; @@ -1235,11 +1242,22 @@ static int uncore_event_cpu_online(unsigned int cpu) type = *types; pmu = type->pmus; for (i = 0; i < type->num_boxes; i++, pmu++) { - box = pmu->boxes[die]; + box = pmu->boxes[id]; if (box && atomic_inc_return(&box->refcnt) == 1) uncore_box_init(box); } } + return 0; +} + +static int uncore_event_cpu_online(unsigned int cpu) +{ + int ret, die, target; + + die = topology_logical_die_id(cpu); + ret = uncore_box_ref(uncore_msr_uncores, die, cpu); + if (ret) + return ret; /* * Check if there is an online cpu in the package |