From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org,
mike.leach@linaro.org, robert.walker@arm.com,
coresight@lists.linaro.org, devicetree@vger.kernel.org,
robh@kernel.org, frowand.list@gmail.com,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v2 04/12] coresight: tmc-etr: Disallow perf mode
Date: Tue, 29 May 2018 14:15:29 +0100 [thread overview]
Message-ID: <1527599737-28408-5-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1527599737-28408-1-git-send-email-suzuki.poulose@arm.com>
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>
---
drivers/hwtracing/coresight/coresight-tmc-etr.c | 28 ++-----------------------
1 file changed, 2 insertions(+), 26 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 1de05c9..18c9a18 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -211,32 +211,8 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
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)
--
2.7.4
next prev parent reply other threads:[~2018-05-29 13:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-29 13:15 [PATCH v2 00/12] coresight: tmc-etr Transparent buffer management Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 01/12] coresight: ETM: Add support for Arm Cortex-A73 and Cortex-A35 Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 02/12] coresight: tmc: Hide trace buffer handling for file read Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 03/12] coresight: tmc-etr: Do not clean trace buffer Suzuki K Poulose
2018-05-29 13:15 ` Suzuki K Poulose [this message]
2018-05-29 13:15 ` [PATCH v2 05/12] coresight: Add helper for inserting synchronization packets Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 06/12] dts: bindings: Restrict coresight tmc-etr scatter-gather mode Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 07/12] dts: juno: Add scatter-gather support for all revisions Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 08/12] coresight: Add generic TMC sg table framework Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 09/12] coresight: Add support for TMC ETR SG unit Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 10/12] coresight: tmc-etr: Add transparent buffer management Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 11/12] coresight: tmc-etr buf: Add TMC scatter gather mode backend Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 12/12] coresight: tmc: Add configuration support for trace buffer size Suzuki K Poulose
2018-05-31 3:55 ` Rob Herring
2018-05-31 15:36 ` [PATCH v2 00/12] coresight: tmc-etr Transparent buffer management Mathieu Poirier
2018-05-31 16:17 ` Suzuki K Poulose
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