lkml.org 
[lkml]   [2019]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/5] perf/x86/intel/uncore: Extract codes of box ref/unref
Date
From: Kan Liang <kan.liang@linux.intel.com>

For uncore box which can only be accessed by MSR, its reference
box->refcnt is updated in CPU hot plug. The uncore boxes needs to be
init/exit 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>
---
arch/x86/events/intel/uncore.c | 55 +++++++++++++++++++++++++++---------------
1 file changed, 36 insertions(+), 19 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index ee23b50..0b72ca5 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -1140,12 +1140,27 @@ 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, pkg, 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 pkg, target;

/* Check if exiting cpu is used for collecting uncore events */
if (!cpumask_test_and_clear_cpu(cpu, &uncore_cpu_mask))
@@ -1165,15 +1180,7 @@ static int uncore_event_cpu_offline(unsigned int cpu)
unref:
/* Clear the references */
pkg = topology_logical_package_id(cpu);
- for (; *types; types++) {
- type = *types;
- pmu = type->pmus;
- for (i = 0; i < type->num_boxes; i++, pmu++) {
- box = pmu->boxes[pkg];
- if (box && atomic_dec_return(&box->refcnt) == 0)
- uncore_box_exit(box);
- }
- }
+ uncore_box_unref(uncore_msr_uncores, pkg);
return 0;
}

@@ -1215,16 +1222,15 @@ static int allocate_boxes(struct intel_uncore_type **types,
}
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, pkg, target;
+ int i, ret;

- pkg = topology_logical_package_id(cpu);
- ret = allocate_boxes(types, pkg, cpu);
+ ret = allocate_boxes(types, id, cpu);
if (ret)
return ret;

@@ -1232,11 +1238,22 @@ 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[pkg];
+ 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, pkg, target;
+
+ pkg = topology_logical_package_id(cpu);
+ ret = uncore_box_ref(uncore_msr_uncores, pkg, cpu);
+ if (ret)
+ return ret;

/*
* Check if there is an online cpu in the package
--
2.7.4
\
 
 \ /
  Last update: 2019-04-15 20:43    [W:0.094 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site