[tip:perf/core] perf/x86/intel/uncore: Make code more readable

From: tip-bot for Thomas Gleixner
Date: Mon Feb 29 2016 - 06:06:43 EST

Commit-ID: 1229735b290d12003a1362ccfc442c690c93bc3a
Gitweb: http://git.kernel.org/tip/1229735b290d12003a1362ccfc442c690c93bc3a
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Mon, 22 Feb 2016 22:19:12 +0000
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 29 Feb 2016 09:35:15 +0100

perf/x86/intel/uncore: Make code more readable

Clean up the code a bit before reworking it completely.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi.kleen@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Harish Chegondi <harish.chegondi@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20160222221011.204771538@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/events/intel/uncore.c | 95 ++++++++++++++++++++++--------------------
1 file changed, 50 insertions(+), 45 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index c3d1cbb..84055f2 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -217,7 +217,8 @@ u64 uncore_shared_reg_config(struct intel_uncore_box *box, int idx)
return config;
}

-static void uncore_assign_hw_event(struct intel_uncore_box *box, struct perf_event *event, int idx)
+static void uncore_assign_hw_event(struct intel_uncore_box *box,
+ struct perf_event *event, int idx)
{
struct hw_perf_event *hwc = &event->hw;

@@ -312,18 +313,19 @@ static void uncore_pmu_init_hrtimer(struct intel_uncore_box *box)
box->hrtimer.function = uncore_pmu_hrtimer;
}

-static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type, int node)
+static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
+ int node)
{
+ int i, size, numshared = type->num_shared_regs ;
struct intel_uncore_box *box;
- int i, size;

- size = sizeof(*box) + type->num_shared_regs * sizeof(struct intel_uncore_extra_reg);
+ size = sizeof(*box) + numshared * sizeof(struct intel_uncore_extra_reg);

box = kzalloc_node(size, GFP_KERNEL, node);
if (!box)
return NULL;

- for (i = 0; i < type->num_shared_regs; i++)
+ for (i = 0; i < numshared; i++)
raw_spin_lock_init(&box->shared_regs[i].lock);

uncore_pmu_init_hrtimer(box);
@@ -351,7 +353,8 @@ static bool is_uncore_event(struct perf_event *event)
}

static int
-uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader, bool dogrp)
+uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader,
+ bool dogrp)
{
struct perf_event *event;
int n, max_count;
@@ -412,7 +415,8 @@ uncore_get_event_constraint(struct intel_uncore_box *box, struct perf_event *eve
return &type->unconstrainted;
}

-static void uncore_put_event_constraint(struct intel_uncore_box *box, struct perf_event *event)
+static void uncore_put_event_constraint(struct intel_uncore_box *box,
+ struct perf_event *event)
{
if (box->pmu->type->ops->put_constraint)
box->pmu->type->ops->put_constraint(box, event);
@@ -592,7 +596,7 @@ static void uncore_pmu_event_del(struct perf_event *event, int flags)
if (event == box->event_list[i]) {
uncore_put_event_constraint(box, event);

- while (++i < box->n_events)
+ for (++i; i < box->n_events; i++)
box->event_list[i - 1] = box->event_list[i];

--box->n_events;
@@ -801,10 +805,8 @@ static void __init uncore_type_exit(struct intel_uncore_type *type)

static void __init uncore_types_exit(struct intel_uncore_type **types)
{
- int i;
-
- for (i = 0; types[i]; i++)
- uncore_type_exit(types[i]);
+ for (; *types; types++)
+ uncore_type_exit(*types);
}

static int __init uncore_type_init(struct intel_uncore_type *type)
@@ -908,9 +910,11 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
* some device types. Hence PCI device idx would be 0 for all devices.
* So increment pmu pointer to point to an unused array element.
*/
- if (boot_cpu_data.x86_model == 87)
+ if (boot_cpu_data.x86_model == 87) {
while (pmu->func_id >= 0)
pmu++;
+ }
+
if (pmu->func_id < 0)
pmu->func_id = pdev->devfn;
else
@@ -1170,44 +1174,45 @@ static int uncore_cpu_prepare(int cpu, int phys_id)
return 0;
}

-static void
-uncore_change_context(struct intel_uncore_type **uncores, int old_cpu, int new_cpu)
+static void uncore_change_type_ctx(struct intel_uncore_type *type, int old_cpu,
+ int new_cpu)
{
- struct intel_uncore_type *type;
- struct intel_uncore_pmu *pmu;
+ struct intel_uncore_pmu *pmu = type->pmus;
struct intel_uncore_box *box;
- int i, j;
-
- for (i = 0; uncores[i]; i++) {
- type = uncores[i];
- for (j = 0; j < type->num_boxes; j++) {
- pmu = &type->pmus[j];
- if (old_cpu < 0)
- box = uncore_pmu_to_box(pmu, new_cpu);
- else
- box = uncore_pmu_to_box(pmu, old_cpu);
- if (!box)
- continue;
+ int i;

- if (old_cpu < 0) {
- WARN_ON_ONCE(box->cpu != -1);
- box->cpu = new_cpu;
- continue;
- }
+ for (i = 0; i < type->num_boxes; i++, pmu++) {
+ if (old_cpu < 0)
+ box = uncore_pmu_to_box(pmu, new_cpu);
+ else
+ box = uncore_pmu_to_box(pmu, old_cpu);
+ if (!box)
+ continue;

- WARN_ON_ONCE(box->cpu != old_cpu);
- if (new_cpu >= 0) {
- uncore_pmu_cancel_hrtimer(box);
- perf_pmu_migrate_context(&pmu->pmu,
- old_cpu, new_cpu);
- box->cpu = new_cpu;
- } else {
- box->cpu = -1;
- }
+ if (old_cpu < 0) {
+ WARN_ON_ONCE(box->cpu != -1);
+ box->cpu = new_cpu;
+ continue;
}
+
+ WARN_ON_ONCE(box->cpu != old_cpu);
+ box->cpu = -1;
+ if (new_cpu < 0)
+ continue;
+
+ uncore_pmu_cancel_hrtimer(box);
+ perf_pmu_migrate_context(&pmu->pmu, old_cpu, new_cpu);
+ box->cpu = new_cpu;
}
}

+static void uncore_change_context(struct intel_uncore_type **uncores,
+ int old_cpu, int new_cpu)
+{
+ for (; *uncores; uncores++)
+ uncore_change_type_ctx(*uncores, old_cpu, new_cpu);
+}
+
static void uncore_event_exit_cpu(int cpu)
{
int i, phys_id, target;
@@ -1318,8 +1323,8 @@ static int __init uncore_msr_pmus_register(void)
struct intel_uncore_type **types = uncore_msr_uncores;
int ret;

- while (*types) {
- ret = type_pmu_register(*types++);
+ for (; *types; types++) {
+ ret = type_pmu_register(*types);
if (ret)
return ret;
}