[PATCH v3 1/3] ARM: perf: Preparatory work for Scorpion PMU support
Stephen Boyd
sboyd at codeaurora.org
Fri Feb 27 16:11:33 PST 2015
Do some things to make the Krait PMU support code generic enough
to be used by the Scorpion PMU support code.
* Rename the venum register functions to be venum instead of krait
specific because the same registers exist on Scorpion
* Add some macros to decode our Krait specific event encoding that's
the same on Scorpion (modulo an extra region).
* Drop 'krait' from krait_clear_pmresrn_group() so it can be used
by Scorpion code
Signed-off-by: Stephen Boyd <sboyd at codeaurora.org>
---
arch/arm/kernel/perf_event_v7.c | 100 +++++++++++++++++-----------------------
1 file changed, 43 insertions(+), 57 deletions(-)
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index 8993770c47de..97a7eda8831a 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -1103,6 +1103,12 @@ static int armv7_a17_pmu_init(struct arm_pmu *cpu_pmu)
#define KRAIT_EVENT_MASK (KRAIT_EVENT | VENUM_EVENT)
#define PMRESRn_EN BIT(31)
+#define EVENT_REGION(event) (((event) >> 12) & 0xf) /* R */
+#define EVENT_GROUP(event) ((event) & 0xf) /* G */
+#define EVENT_CODE(event) (((event) >> 4) & 0xff) /* CC */
+#define EVENT_VENUM(event) (!!(event & VENUM_EVENT)) /* N=2 */
+#define EVENT_CPU(event) (!!(event & KRAIT_EVENT)) /* N=1 */
+
static u32 krait_read_pmresrn(int n)
{
u32 val;
@@ -1141,19 +1147,19 @@ static void krait_write_pmresrn(int n, u32 val)
}
}
-static u32 krait_read_vpmresr0(void)
+static u32 venum_read_pmresr(void)
{
u32 val;
asm volatile("mrc p10, 7, %0, c11, c0, 0" : "=r" (val));
return val;
}
-static void krait_write_vpmresr0(u32 val)
+static void venum_write_pmresr(u32 val)
{
asm volatile("mcr p10, 7, %0, c11, c0, 0" : : "r" (val));
}
-static void krait_pre_vpmresr0(u32 *venum_orig_val, u32 *fp_orig_val)
+static void venum_pre_pmresr(u32 *venum_orig_val, u32 *fp_orig_val)
{
u32 venum_new_val;
u32 fp_new_val;
@@ -1170,7 +1176,7 @@ static void krait_pre_vpmresr0(u32 *venum_orig_val, u32 *fp_orig_val)
fmxr(FPEXC, fp_new_val);
}
-static void krait_post_vpmresr0(u32 venum_orig_val, u32 fp_orig_val)
+static void venum_post_pmresr(u32 venum_orig_val, u32 fp_orig_val)
{
BUG_ON(preemptible());
/* Restore FPEXC */
@@ -1193,16 +1199,11 @@ static void krait_evt_setup(int idx, u32 config_base)
u32 val;
u32 mask;
u32 vval, fval;
- unsigned int region;
- unsigned int group;
- unsigned int code;
+ unsigned int region = EVENT_REGION(config_base);
+ unsigned int group = EVENT_GROUP(config_base);
+ unsigned int code = EVENT_CODE(config_base);
unsigned int group_shift;
- bool venum_event;
-
- venum_event = !!(config_base & VENUM_EVENT);
- region = (config_base >> 12) & 0xf;
- code = (config_base >> 4) & 0xff;
- group = (config_base >> 0) & 0xf;
+ bool venum_event = EVENT_VENUM(config_base);
group_shift = group * 8;
mask = 0xff << group_shift;
@@ -1220,13 +1221,13 @@ static void krait_evt_setup(int idx, u32 config_base)
asm volatile("mcr p15, 0, %0, c9, c15, 0" : : "r" (0));
if (venum_event) {
- krait_pre_vpmresr0(&vval, &fval);
- val = krait_read_vpmresr0();
+ venum_pre_pmresr(&vval, &fval);
+ val = venum_read_pmresr();
val &= ~mask;
val |= code << group_shift;
val |= PMRESRn_EN;
- krait_write_vpmresr0(val);
- krait_post_vpmresr0(vval, fval);
+ venum_write_pmresr(val);
+ venum_post_pmresr(vval, fval);
} else {
val = krait_read_pmresrn(region);
val &= ~mask;
@@ -1236,7 +1237,7 @@ static void krait_evt_setup(int idx, u32 config_base)
}
}
-static u32 krait_clear_pmresrn_group(u32 val, int group)
+static u32 clear_pmresrn_group(u32 val, int group)
{
u32 mask;
int group_shift;
@@ -1256,23 +1257,19 @@ static void krait_clearpmu(u32 config_base)
{
u32 val;
u32 vval, fval;
- unsigned int region;
- unsigned int group;
- bool venum_event;
-
- venum_event = !!(config_base & VENUM_EVENT);
- region = (config_base >> 12) & 0xf;
- group = (config_base >> 0) & 0xf;
+ unsigned int region = EVENT_REGION(config_base);
+ unsigned int group = EVENT_GROUP(config_base);
+ bool venum_event = EVENT_VENUM(config_base);
if (venum_event) {
- krait_pre_vpmresr0(&vval, &fval);
- val = krait_read_vpmresr0();
- val = krait_clear_pmresrn_group(val, group);
- krait_write_vpmresr0(val);
- krait_post_vpmresr0(vval, fval);
+ venum_pre_pmresr(&vval, &fval);
+ val = venum_read_pmresr();
+ val = clear_pmresrn_group(val, group);
+ venum_write_pmresr(val);
+ venum_post_pmresr(vval, fval);
} else {
val = krait_read_pmresrn(region);
- val = krait_clear_pmresrn_group(val, group);
+ val = clear_pmresrn_group(val, group);
krait_write_pmresrn(region, val);
}
}
@@ -1350,9 +1347,9 @@ static void krait_pmu_reset(void *info)
krait_write_pmresrn(1, 0);
krait_write_pmresrn(2, 0);
- krait_pre_vpmresr0(&vval, &fval);
- krait_write_vpmresr0(0);
- krait_post_vpmresr0(vval, fval);
+ venum_pre_pmresr(&vval, &fval);
+ venum_write_pmresr(0);
+ venum_post_pmresr(vval, fval);
}
static int krait_event_to_bit(struct perf_event *event, unsigned int region,
@@ -1386,26 +1383,18 @@ static int krait_pmu_get_event_idx(struct pmu_hw_events *cpuc,
{
int idx;
int bit = -1;
- unsigned int prefix;
- unsigned int region;
- unsigned int code;
- unsigned int group;
- bool krait_event;
struct hw_perf_event *hwc = &event->hw;
+ unsigned int region = EVENT_REGION(hwc->config_base);
+ unsigned int code = EVENT_CODE(hwc->config_base);
+ unsigned int group = EVENT_GROUP(hwc->config_base);
+ bool venum_event = EVENT_VENUM(hwc->config_base);
+ bool krait_event = EVENT_CPU(hwc->config_base);
- region = (hwc->config_base >> 12) & 0xf;
- code = (hwc->config_base >> 4) & 0xff;
- group = (hwc->config_base >> 0) & 0xf;
- krait_event = !!(hwc->config_base & KRAIT_EVENT_MASK);
-
- if (krait_event) {
+ if (venum_event || krait_event) {
/* Ignore invalid events */
if (group > 3 || region > 2)
return -EINVAL;
- prefix = hwc->config_base & KRAIT_EVENT_MASK;
- if (prefix != KRAIT_EVENT && prefix != VENUM_EVENT)
- return -EINVAL;
- if (prefix == VENUM_EVENT && (code & 0xe0))
+ if (venum_event && (code & 0xe0))
return -EINVAL;
bit = krait_event_to_bit(event, region, group);
@@ -1425,15 +1414,12 @@ static void krait_pmu_clear_event_idx(struct pmu_hw_events *cpuc,
{
int bit;
struct hw_perf_event *hwc = &event->hw;
- unsigned int region;
- unsigned int group;
- bool krait_event;
-
- region = (hwc->config_base >> 12) & 0xf;
- group = (hwc->config_base >> 0) & 0xf;
- krait_event = !!(hwc->config_base & KRAIT_EVENT_MASK);
+ unsigned int region = EVENT_REGION(hwc->config_base);
+ unsigned int group = EVENT_GROUP(hwc->config_base);
+ bool venum_event = EVENT_VENUM(hwc->config_base);
+ bool krait_event = EVENT_CPU(hwc->config_base);
- if (krait_event) {
+ if (venum_event || krait_event) {
bit = krait_event_to_bit(event, region, group);
clear_bit(bit, cpuc->used_mask);
}
--
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