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Message-Id: <1423616724-20849-2-git-send-email-sboyd@codeaurora.org>
Date: Tue, 10 Feb 2015 17:05:23 -0800
From: Stephen Boyd <sboyd@...eaurora.org>
To: Will Deacon <will.deacon@....com>
Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 1/2] ARM: perf: Preparatory work for Scorpion PMU support
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 a krait_decode_event() function 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
* Drop a redundant check in krait_pmu_get_event_idx()
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
arch/arm/kernel/perf_event_v7.c | 87 ++++++++++++++++++++++-------------------
1 file changed, 46 insertions(+), 41 deletions(-)
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index 8993770c47de..84a3ec3bc592 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -1141,19 +1141,19 @@ 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 +1170,7 @@ 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 */
@@ -1188,6 +1188,21 @@ static u32 krait_get_pmresrn_event(unsigned int region)
return pmresrn_table[region];
}
+static void krait_decode_event(u32 event, unsigned int *region,
+ unsigned int *group, unsigned int *code, bool *venum, bool *cpu)
+{
+ if (region)
+ *region = (event >> 12) & 0xf;
+ if (group)
+ *group = (event >> 0) & 0xf;
+ if (code)
+ *code = (event >> 4) & 0xff;
+ if (venum)
+ *venum = !!(event & VENUM_EVENT);
+ if (cpu)
+ *cpu = !!(event & KRAIT_EVENT);
+}
+
static void krait_evt_setup(int idx, u32 config_base)
{
u32 val;
@@ -1199,10 +1214,8 @@ static void krait_evt_setup(int idx, u32 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;
+ krait_decode_event(config_base, ®ion, &group, &code, &venum_event,
+ NULL);
group_shift = group * 8;
mask = 0xff << group_shift;
@@ -1220,13 +1233,13 @@ 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 +1249,7 @@ 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;
@@ -1260,19 +1273,18 @@ static void krait_clearpmu(u32 config_base)
unsigned int group;
bool venum_event;
- venum_event = !!(config_base & VENUM_EVENT);
- region = (config_base >> 12) & 0xf;
- group = (config_base >> 0) & 0xf;
+ krait_decode_event(config_base, ®ion, &group, NULL, &venum_event,
+ NULL);
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 +1362,9 @@ 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 +1398,20 @@ 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;
+ bool venum_event, krait_event;
struct hw_perf_event *hwc = &event->hw;
- 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);
+ krait_decode_event(hwc->config_base, ®ion, &group, &code,
+ &venum_event, &krait_event);
- 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);
@@ -1427,13 +1433,12 @@ static void krait_pmu_clear_event_idx(struct pmu_hw_events *cpuc,
struct hw_perf_event *hwc = &event->hw;
unsigned int region;
unsigned int group;
- bool krait_event;
+ bool venum_event, krait_event;
- region = (hwc->config_base >> 12) & 0xf;
- group = (hwc->config_base >> 0) & 0xf;
- krait_event = !!(hwc->config_base & KRAIT_EVENT_MASK);
+ krait_decode_event(hwc->config_base, ®ion, &group, NULL,
+ &venum_event, &krait_event);
- if (krait_event) {
+ if (venum_event || krait_event) {
bit = krait_event_to_bit(event, region, group);
clear_bit(bit, cpuc->used_mask);
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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