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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-07-11 22:40:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-15 14:52:56 +0300
commitef32df53b73bd29d5bfa4af4fda287baa6dc6544 (patch)
tree0b98790d6e51428b04357fc76c174cd1d8b6a981 /drivers/hwtracing
parent0f728a7f9f8fed5dfd86a628d871d572cb91942c (diff)
downloadlinux-ef32df53b73bd29d5bfa4af4fda287baa6dc6544.tar.xz
coresight: tmc-etr: Disallow perf mode
We don't support ETR in perf mode yet. So, don't even try to enable the hardware, even by mistake. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c28
1 files changed, 2 insertions, 26 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 1de05c9a01c8..18c9a184d31a 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -211,32 +211,8 @@ out:
static int tmc_enable_etr_sink_perf(struct coresight_device *csdev)
{
- int ret = 0;
- unsigned long flags;
- struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-
- spin_lock_irqsave(&drvdata->spinlock, flags);
- if (drvdata->reading) {
- ret = -EINVAL;
- goto out;
- }
-
- /*
- * In Perf mode there can be only one writer per sink. There
- * is also no need to continue if the ETR is already operated
- * from sysFS.
- */
- if (drvdata->mode != CS_MODE_DISABLED) {
- ret = -EINVAL;
- goto out;
- }
-
- drvdata->mode = CS_MODE_PERF;
- tmc_etr_enable_hw(drvdata);
-out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
-
- return ret;
+ /* We don't support perf mode yet ! */
+ return -EINVAL;
}
static int tmc_enable_etr_sink(struct coresight_device *csdev, u32 mode)