mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-08 12:52:40 -04:00
Code Issues Packages Projects Releases Wiki Activity

coresight: tmc: Stop trace capture on FlIn

Browse Source 
Configure TMC ETR and ETF to flush and stop trace capture
on FlIn event based on sysfs attribute,
/sys/bus/coresight/devices/tmc_etXn/stop_on_flush.

Signed-off-by: Linu Cherian <lcherian@marvell.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250212114918.548431-7-lcherian@marvell.com
This commit is contained in:
Linu Cherian
2025-02-12 17:19:16 +05:30
committed by Suzuki K Poulose
parent d58a70bdab
commit 942bbeeaf8
4 changed files with 47 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/hwtracing/coresight/coresight-tmc-core.c
View File

@@ -532,9 +532,40 @@ static ssize_t buffer_size_store(struct device *dev,
static DEVICE_ATTR_RW(buffer_size);
static ssize_t stop_on_flush_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
return sprintf(buf, "%#x\n", drvdata->stop_on_flush);
}
static ssize_t stop_on_flush_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
int ret;
u8 val;
struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
ret = kstrtou8(buf, 0, &val);
if (ret)
return ret;
if (val)
drvdata->stop_on_flush = true;
else
drvdata->stop_on_flush = false;
return size;
}
static DEVICE_ATTR_RW(stop_on_flush);
static struct attribute *coresight_tmc_attrs[] = {
&dev_attr_trigger_cntr.attr,
&dev_attr_buffer_size.attr,
&dev_attr_stop_on_flush.attr,
NULL,
};

12
drivers/hwtracing/coresight/coresight-tmc-etf.c
View File

@@ -19,6 +19,7 @@ static int tmc_set_etf_buffer(struct coresight_device *csdev,
static int __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
{
int rc = 0;
u32 ffcr;
CS_UNLOCK(drvdata->base);
@@ -32,10 +33,12 @@ static int __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
}
writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
TMC_FFCR_TRIGON_TRIGIN,
drvdata->base + TMC_FFCR);
ffcr = TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI | TMC_FFCR_FON_FLIN |
TMC_FFCR_FON_TRIG_EVT | TMC_FFCR_TRIGON_TRIGIN;
if (drvdata->stop_on_flush)
ffcr |= TMC_FFCR_STOP_ON_FLUSH;
writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
tmc_enable_hw(drvdata);
@@ -225,7 +228,6 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
used = true;
drvdata->buf = buf;
}
ret = tmc_etb_enable_hw(drvdata);
if (!ret) {
coresight_set_mode(csdev, CS_MODE_SYSFS);

12
drivers/hwtracing/coresight/coresight-tmc-etr.c
View File

@@ -1060,7 +1060,7 @@ static void tmc_sync_etr_buf(struct tmc_drvdata *drvdata)
static int __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
{
u32 axictl, sts;
u32 axictl, sts, ffcr;
struct etr_buf *etr_buf = drvdata->etr_buf;
int rc = 0;
@@ -1106,10 +1106,12 @@ static int __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
writel_relaxed(sts, drvdata->base + TMC_STS);
}
writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
TMC_FFCR_TRIGON_TRIGIN,
drvdata->base + TMC_FFCR);
ffcr = TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI | TMC_FFCR_FON_FLIN |
TMC_FFCR_FON_TRIG_EVT | TMC_FFCR_TRIGON_TRIGIN;
if (drvdata->stop_on_flush)
ffcr |= TMC_FFCR_STOP_ON_FLUSH;
writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
tmc_enable_hw(drvdata);

2
drivers/hwtracing/coresight/coresight-tmc.h
View File

@@ -220,6 +220,7 @@ struct tmc_resrv_buf {
* @pid: Process ID of the process that owns the session that is using
* this component. For example this would be the pid of the Perf
* process.
* @stop_on_flush: Stop on flush trigger user configuration.
* @buf: Snapshot of the trace data for ETF/ETB.
* @etr_buf: details of buffer used in TMC-ETR
* @len: size of the available trace for ETF/ETB.
@@ -251,6 +252,7 @@ struct tmc_drvdata {
spinlock_t spinlock;
pid_t pid;
bool reading;
bool stop_on_flush;
union {
char *buf; /* TMC ETB */
struct etr_buf *etr_buf; /* TMC ETR */