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coresight: etm3x: unlocking tracers in default arch init 

Calling function 'smp_call_function_single()' to unlock a
tracer and calling it again right after to perform the
default initialisation doesn't make sense.

Moving 'etm_os_unlock()' just before making the default
initialisation results in the same outcome while saving
one call to 'smp_call_function_single()'.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-02-17 17:51:50 -07:00 committed by Greg Kroah-Hartman
parent c04148e708
commit ae69a1da39
1 changed files with 5 additions and 5 deletions
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10
drivers/hwtracing/coresight/coresight-etm3x.c
View File

@ -47,11 +47,11 @@ static struct etm_drvdata *etmdrvdata[NR_CPUS];
* and OS lock must be unlocked before any memory mapped access on such
* processors, otherwise memory mapped reads/writes will be invalid.
*/
static void etm_os_unlock(void *info)
static void etm_os_unlock(struct etm_drvdata *drvdata)
{
struct etm_drvdata *drvdata = (struct etm_drvdata *)info;
/* Writing any value to ETMOSLAR unlocks the trace registers */
etm_writel(drvdata, 0x0, ETMOSLAR);
drvdata->os_unlock = true;
isb();
}
@ -483,6 +483,9 @@ static void etm_init_arch_data(void *info)
u32 etmccr;
struct etm_drvdata *drvdata = info;
/* Make sure all registers are accessible */
etm_os_unlock(drvdata);
CS_UNLOCK(drvdata->base);
/* First dummy read */
@ -607,9 +610,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
get_online_cpus();
etmdrvdata[drvdata->cpu] = drvdata;
if (!smp_call_function_single(drvdata->cpu, etm_os_unlock, drvdata, 1))
drvdata->os_unlock = true;
if (smp_call_function_single(drvdata->cpu,
etm_init_arch_data, drvdata, 1))
dev_err(dev, "ETM arch init failed\n");