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path: root/drivers/gator/gator_events_armv7.c
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Diffstat (limited to 'drivers/gator/gator_events_armv7.c')
-rw-r--r--drivers/gator/gator_events_armv7.c90
1 files changed, 45 insertions, 45 deletions
diff --git a/drivers/gator/gator_events_armv7.c b/drivers/gator/gator_events_armv7.c
index bd8a9ba24e99..09c94220114c 100644
--- a/drivers/gator/gator_events_armv7.c
+++ b/drivers/gator/gator_events_armv7.c
@@ -15,16 +15,16 @@
#include "gator.h"
-// gator_events_perf_pmu.c is used if perf is supported
+/* gator_events_perf_pmu.c is used if perf is supported */
#if GATOR_NO_PERF_SUPPORT
-// Per-CPU PMNC: config reg
+/* Per-CPU PMNC: config reg */
#define PMNC_E (1 << 0) /* Enable all counters */
#define PMNC_P (1 << 1) /* Reset all counters */
#define PMNC_C (1 << 2) /* Cycle counter reset */
#define PMNC_MASK 0x3f /* Mask for writable bits */
-// ccnt reg
+/* ccnt reg */
#define CCNT_REG (1 << 31)
#define CCNT 0
@@ -49,6 +49,7 @@ inline void armv7_pmnc_write(u32 val)
inline u32 armv7_pmnc_read(void)
{
u32 val;
+
asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
return val;
}
@@ -61,10 +62,10 @@ inline u32 armv7_ccnt_read(u32 reset_value)
u32 val;
local_irq_save(flags);
- asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); // disable
- asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val)); // read
- asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (newval)); // new value
- asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); // enable
+ asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); /* disable */
+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val)); /* read */
+ asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (newval)); /* new value */
+ asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); /* enable */
local_irq_restore(flags);
return val;
@@ -79,11 +80,11 @@ inline u32 armv7_cntn_read(unsigned int cnt, u32 reset_value)
u32 oldval;
local_irq_save(flags);
- asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); // disable
- asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (sel)); // select
- asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (oldval)); // read
- asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (newval)); // new value
- asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); // enable
+ asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); /* disable */
+ asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (sel)); /* select */
+ asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (oldval)); /* read */
+ asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (newval)); /* new value */
+ asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); /* enable */
local_irq_restore(flags);
return oldval;
@@ -92,13 +93,15 @@ inline u32 armv7_cntn_read(unsigned int cnt, u32 reset_value)
static inline void armv7_pmnc_disable_interrupt(unsigned int cnt)
{
u32 val = cnt ? (1 << (cnt - CNT0)) : (1 << 31);
+
asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val));
}
inline u32 armv7_pmnc_reset_interrupt(void)
{
- // Get and reset overflow status flags
+ /* Get and reset overflow status flags */
u32 flags;
+
asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (flags));
flags &= 0x8000003f;
asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (flags));
@@ -108,6 +111,7 @@ inline u32 armv7_pmnc_reset_interrupt(void)
static inline u32 armv7_pmnc_enable_counter(unsigned int cnt)
{
u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG;
+
asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));
return cnt;
}
@@ -115,6 +119,7 @@ static inline u32 armv7_pmnc_enable_counter(unsigned int cnt)
static inline u32 armv7_pmnc_disable_counter(unsigned int cnt)
{
u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG;
+
asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));
return cnt;
}
@@ -122,15 +127,15 @@ static inline u32 armv7_pmnc_disable_counter(unsigned int cnt)
static inline int armv7_pmnc_select_counter(unsigned int cnt)
{
u32 val = (cnt - CNT0);
+
asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));
return cnt;
}
static inline void armv7_pmnc_write_evtsel(unsigned int cnt, u32 val)
{
- if (armv7_pmnc_select_counter(cnt) == cnt) {
+ if (armv7_pmnc_select_counter(cnt) == cnt)
asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
- }
}
static int gator_events_armv7_create_files(struct super_block *sb, struct dentry *root)
@@ -140,20 +145,18 @@ static int gator_events_armv7_create_files(struct super_block *sb, struct dentry
for (i = 0; i < pmnc_counters; i++) {
char buf[40];
- if (i == 0) {
- snprintf(buf, sizeof buf, "%s_ccnt", pmnc_name);
- } else {
- snprintf(buf, sizeof buf, "%s_cnt%d", pmnc_name, i - 1);
- }
+
+ if (i == 0)
+ snprintf(buf, sizeof(buf), "%s_ccnt", pmnc_name);
+ else
+ snprintf(buf, sizeof(buf), "%s_cnt%d", pmnc_name, i - 1);
dir = gatorfs_mkdir(sb, root, buf);
- if (!dir) {
+ if (!dir)
return -1;
- }
gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);
- if (i > 0) {
+ if (i > 0)
gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
- }
}
return 0;
@@ -163,14 +166,13 @@ static int gator_events_armv7_online(int **buffer, bool migrate)
{
unsigned int cnt, len = 0, cpu = smp_processor_id();
- if (armv7_pmnc_read() & PMNC_E) {
+ if (armv7_pmnc_read() & PMNC_E)
armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
- }
- // Initialize & Reset PMNC: C bit and P bit
+ /* Initialize & Reset PMNC: C bit and P bit */
armv7_pmnc_write(PMNC_P | PMNC_C);
- // Reset overflow flags
+ /* Reset overflow flags */
armv7_pmnc_reset_interrupt();
for (cnt = CCNT; cnt < CNTMAX; cnt++) {
@@ -179,28 +181,28 @@ static int gator_events_armv7_online(int **buffer, bool migrate)
if (!pmnc_enabled[cnt])
continue;
- // Disable counter
+ /* Disable counter */
armv7_pmnc_disable_counter(cnt);
event = pmnc_event[cnt] & 255;
- // Set event (if destined for PMNx counters), we don't need to set the event if it's a cycle count
+ /* Set event (if destined for PMNx counters), we don't need to set the event if it's a cycle count */
if (cnt != CCNT)
armv7_pmnc_write_evtsel(cnt, event);
armv7_pmnc_disable_interrupt(cnt);
- // Reset counter
+ /* Reset counter */
cnt ? armv7_cntn_read(cnt, 0) : armv7_ccnt_read(0);
- // Enable counter
+ /* Enable counter */
armv7_pmnc_enable_counter(cnt);
}
- // enable
+ /* enable */
armv7_pmnc_write(armv7_pmnc_read() | PMNC_E);
- // return zero values, no need to read as the counters were just reset
+ /* return zero values, no need to read as the counters were just reset */
for (cnt = 0; cnt < pmnc_counters; cnt++) {
if (pmnc_enabled[cnt]) {
per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
@@ -216,7 +218,7 @@ static int gator_events_armv7_online(int **buffer, bool migrate)
static int gator_events_armv7_offline(int **buffer, bool migrate)
{
- // disable all counters, including PMCCNTR; overflow IRQs will not be signaled
+ /* disable all counters, including PMCCNTR; overflow IRQs will not be signaled */
armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
return 0;
@@ -232,24 +234,23 @@ static void gator_events_armv7_stop(void)
}
}
-static int gator_events_armv7_read(int **buffer)
+static int gator_events_armv7_read(int **buffer, bool sched_switch)
{
int cnt, len = 0;
int cpu = smp_processor_id();
- // a context switch may occur before the online hotplug event, thus need to check that the pmu is enabled
- if (!(armv7_pmnc_read() & PMNC_E)) {
+ /* a context switch may occur before the online hotplug event, thus need to check that the pmu is enabled */
+ if (!(armv7_pmnc_read() & PMNC_E))
return 0;
- }
for (cnt = 0; cnt < pmnc_counters; cnt++) {
if (pmnc_enabled[cnt]) {
int value;
- if (cnt == CCNT) {
+
+ if (cnt == CCNT)
value = armv7_ccnt_read(0);
- } else {
+ else
value = armv7_cntn_read(cnt, 0);
- }
per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
per_cpu(perfCnt, cpu)[len++] = value;
}
@@ -290,17 +291,16 @@ int gator_events_armv7_init(void)
pmnc_name = "ARMv7_Cortex_A9";
pmnc_counters = 6;
break;
- // ARM Cortex A12 is not supported by version of Linux before 3.0
case CORTEX_A15:
pmnc_name = "ARMv7_Cortex_A15";
pmnc_counters = 6;
break;
- // ARM Cortex A17 is not supported by version of Linux before 3.0
+ /* ARM Cortex A17 is not supported by version of Linux before 3.0 */
default:
return -1;
}
- pmnc_counters++; // CNT[n] + CCNT
+ pmnc_counters++; /* CNT[n] + CCNT */
for (cnt = CCNT; cnt < CNTMAX; cnt++) {
pmnc_enabled[cnt] = 0;
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-16 13:55:24 +0000