shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 11:50:43 +09:00
Code Issues Packages Projects Releases Wiki Activity

ARM: etm: Add sysfs entry to set context-id-size

Browse Source 
Change-Id: I520dfb6e593dac131de8b9b1db77f1c734f18c24
Signed-off-by: Arve Hjønnevåg <arve@android.com>
This commit is contained in:
Arve Hjønnevåg
2012-04-02 17:20:32 -07:00
parent bbba6b086d
commit cd472344a2
2 changed files with 42 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/include/asm/hardware/coresight.h
View File

@@ -47,7 +47,7 @@
#define ETMCTRL_POWERDOWN 1
#define ETMCTRL_PROGRAM (1 << 10)
#define ETMCTRL_PORTSEL (1 << 11)
#define ETMCTRL_DO_CONTEXTID (3 << 14)
#define ETMCTRL_CONTEXTIDSIZE(x) (((x) & 3) << 14)
#define ETMCTRL_PORTMASK1 (7 << 4)
#define ETMCTRL_PORTMASK2 (1 << 21)
#define ETMCTRL_PORTMASK (ETMCTRL_PORTMASK1 | ETMCTRL_PORTMASK2)
@@ -127,8 +127,7 @@
#define ETMVDC3_EXCLONLY BIT(16)
#define ETMCTRL_OPTS (ETMCTRL_DO_CPRT | \
ETMCTRL_BRANCH_OUTPUT | \
ETMCTRL_DO_CONTEXTID)
ETMCTRL_BRANCH_OUTPUT)
#define ETMR_ID 0x1e4
#define ETMIDR_VERSION(x) (((x) >> 4) & 0xff)

40
arch/arm/kernel/etm.c
View File

@@ -43,6 +43,7 @@ struct tracectx {
unsigned long flags;
int ncmppairs;
int etm_portsz;
int etm_contextid_size;
u32 etb_fc;
unsigned long range_start;
unsigned long range_end;
@@ -109,6 +110,7 @@ static int trace_start_etm(struct tracectx *t, int id)
unsigned long timeout = TRACER_TIMEOUT;
v = ETMCTRL_OPTS | ETMCTRL_PROGRAM | ETMCTRL_PORTSIZE(t->etm_portsz);
v |= ETMCTRL_CONTEXTIDSIZE(t->etm_contextid_size);
if (t->flags & TRACER_CYCLE_ACC)
v |= ETMCTRL_CYCLEACCURATE;
@@ -650,6 +652,37 @@ static ssize_t trace_mode_store(struct kobject *kobj,
static struct kobj_attribute trace_mode_attr =
__ATTR(trace_mode, 0644, trace_mode_show, trace_mode_store);
static ssize_t trace_contextid_size_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
/* 0: No context id tracing, 1: One byte, 2: Two bytes, 3: Four bytes */
return sprintf(buf, "%d\n", (1 << tracer.etm_contextid_size) >> 1);
}
static ssize_t trace_contextid_size_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned int contextid_size;
if (sscanf(buf, "%u", &contextid_size) != 1)
return -EINVAL;
if (contextid_size == 3 || contextid_size > 4)
return -EINVAL;
mutex_lock(&tracer.mutex);
tracer.etm_contextid_size = fls(contextid_size);
mutex_unlock(&tracer.mutex);
return n;
}
static struct kobj_attribute trace_contextid_size_attr =
__ATTR(trace_contextid_size, 0644,
trace_contextid_size_show, trace_contextid_size_store);
static ssize_t trace_timestamp_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
@@ -789,6 +822,7 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id)
t->flags = TRACER_CYCLE_ACC | TRACER_TRACE_DATA;
t->etm_portsz = 1;
t->etm_contextid_size = 3;
etm_unlock(t, t->etm_regs_count);
(void)etm_readl(t, t->etm_regs_count, ETMMR_PDSR);
@@ -821,6 +855,12 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id)
if (ret)
dev_dbg(&dev->dev, "Failed to create trace_mode in sysfs\n");
ret = sysfs_create_file(&dev->dev.kobj,
&trace_contextid_size_attr.attr);
if (ret)
dev_dbg(&dev->dev,
"Failed to create trace_contextid_size in sysfs\n");
if (etmccer & ETMCCER_TIMESTAMPING_IMPLEMENTED) {
ret = sysfs_create_file(&dev->dev.kobj,
&trace_timestamp_attr.attr);