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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-09-20 13:18:12 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 20:09:19 +0200
commit68a147752d04da73e2786890d78317fc37e6a6a8 (patch)
tree57894602991f016ce2c884eb6abd90fffad179c8 /drivers/hwtracing
parent2478a6ae4a6a4c8e3f7e9f6f849dffe92e5238e1 (diff)
downloadlinux-68a147752d04da73e2786890d78317fc37e6a6a8.tar.bz2
coresight: etmx: Claim devices before use
Use the CLAIM tags to grab the device for self-hosted usage. 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-etm3x.c16
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x.c14
2 files changed, 24 insertions, 6 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index 206c2381a11a..fd5c4cca7db5 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -357,7 +357,7 @@ static int etm_parse_event_config(struct etm_drvdata *drvdata,
static int etm_enable_hw(struct etm_drvdata *drvdata)
{
- int i;
+ int i, rc;
u32 etmcr;
struct etm_config *config = &drvdata->config;
@@ -369,6 +369,9 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
etm_set_pwrup(drvdata);
/* Make sure all registers are accessible */
etm_os_unlock(drvdata);
+ rc = coresight_claim_device_unlocked(drvdata->base);
+ if (rc)
+ goto done;
etm_set_prog(drvdata);
@@ -417,10 +420,15 @@ static int etm_enable_hw(struct etm_drvdata *drvdata)
etm_writel(drvdata, 0x0, ETMVMIDCVR);
etm_clr_prog(drvdata);
+
+done:
+ if (rc)
+ etm_set_pwrdwn(drvdata);
CS_LOCK(drvdata->base);
- dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
- return 0;
+ dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n",
+ drvdata->cpu, rc);
+ return rc;
}
struct etm_enable_arg {
@@ -569,6 +577,8 @@ static void etm_disable_hw(void *info)
for (i = 0; i < drvdata->nr_cntr; i++)
config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
+ coresight_disclaim_device_unlocked(drvdata->base);
+
etm_set_pwrdwn(drvdata);
CS_LOCK(drvdata->base);
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 064e0bfaefd0..53e2fb6e86f6 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -85,13 +85,17 @@ struct etm4_enable_arg {
static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
{
- int i;
+ int i, rc;
struct etmv4_config *config = &drvdata->config;
CS_UNLOCK(drvdata->base);
etm4_os_unlock(drvdata);
+ rc = coresight_claim_device_unlocked(drvdata->base);
+ if (rc)
+ goto done;
+
/* Disable the trace unit before programming trace registers */
writel_relaxed(0, drvdata->base + TRCPRGCTLR);
@@ -179,10 +183,12 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
dev_err(drvdata->dev,
"timeout while waiting for Idle Trace Status\n");
+done:
CS_LOCK(drvdata->base);
- dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
- return 0;
+ dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n",
+ drvdata->cpu, rc);
+ return rc;
}
static void etm4_enable_hw_smp_call(void *info)
@@ -342,6 +348,8 @@ static void etm4_disable_hw(void *info)
isb();
writel_relaxed(control, drvdata->base + TRCPRGCTLR);
+ coresight_disclaim_device_unlocked(drvdata->base);
+
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);