From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, rob.walker@arm.com,
mike.leach@linaro.org, coresight@lists.linaro.org,
mathieu.poirier@linaro.org,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 08/17] coresight: tmc: Add configuration support for trace buffer size
Date: Thu, 19 Oct 2017 18:15:44 +0100 [thread overview]
Message-ID: <20171019171553.24056-9-suzuki.poulose@arm.com> (raw)
In-Reply-To: <20171019171553.24056-1-suzuki.poulose@arm.com>
Now that we can dynamically switch between contiguous memory and
SG table depending on the trace buffer size, provide the support
for selecting an appropriate buffer size.
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
.../ABI/testing/sysfs-bus-coresight-devices-tmc | 8 ++++++
drivers/hwtracing/coresight/coresight-tmc.c | 32 ++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
index 4fe677ed1305..3675c380caf8 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
@@ -83,3 +83,11 @@ KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the capabilities of the Coresight TMC.
The value is read directly from the DEVID register, 0xFC8,
+
+What: /sys/bus/coresight/devices/<memory_map>.tmc/buffer-size
+Date: September 2017
+KernelVersion: 4.15
+Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
+Description: (RW) Size of the trace buffer for TMC-ETR when used in SYSFS
+ mode. Writable only for TMC-ETR configurations. The value
+ should be aligned to the kernel pagesize.
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index c7201e40d737..2349b1805694 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -283,8 +283,40 @@ static ssize_t trigger_cntr_store(struct device *dev,
}
static DEVICE_ATTR_RW(trigger_cntr);
+static ssize_t buffer_size_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->size);
+}
+
+static ssize_t buffer_size_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ int ret;
+ unsigned long val;
+ struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ if (drvdata->config_type != TMC_CONFIG_TYPE_ETR)
+ return -EPERM;
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret)
+ return ret;
+ /* The buffer size should be page aligned */
+ if (val & (PAGE_SIZE - 1))
+ return -EINVAL;
+ drvdata->size = val;
+ return size;
+}
+
+static DEVICE_ATTR_RW(buffer_size);
+
static struct attribute *coresight_tmc_attrs[] = {
&dev_attr_trigger_cntr.attr,
+ &dev_attr_buffer_size.attr,
NULL,
};
--
2.13.6
next prev parent reply other threads:[~2017-10-19 17:19 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-19 17:15 [PATCH 00/17] coresight: perf: TMC ETR backend support Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 01/17] coresight etr: Disallow perf mode temporarily Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 02/17] coresight tmc: Hide trace buffer handling for file read Suzuki K Poulose
2017-10-20 12:34 ` Julien Thierry
2017-11-01 9:55 ` Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 03/17] coresight: Add helper for inserting synchronization packets Suzuki K Poulose
2017-10-30 21:44 ` Mathieu Poirier
2017-11-01 10:01 ` Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 04/17] coresight: Add generic TMC sg table framework Suzuki K Poulose
2017-10-31 22:13 ` Mathieu Poirier
2017-11-01 10:09 ` Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 05/17] coresight: Add support for TMC ETR SG unit Suzuki K Poulose
2017-10-20 16:25 ` Julien Thierry
2017-11-01 10:11 ` Suzuki K Poulose
2017-11-01 20:41 ` Mathieu Poirier
2017-10-19 17:15 ` [PATCH 06/17] coresight: tmc: Make ETR SG table circular Suzuki K Poulose
2017-10-20 17:11 ` Julien Thierry
2017-11-01 10:12 ` Suzuki K Poulose
2017-11-01 23:47 ` Mathieu Poirier
2017-11-02 12:00 ` Suzuki K Poulose
2017-11-02 14:40 ` Mathieu Poirier
2017-11-02 15:13 ` Russell King - ARM Linux
2017-11-06 19:07 ` Mathieu Poirier
2017-11-07 10:36 ` Suzuki K Poulose
2017-11-09 16:19 ` Mathieu Poirier
2017-10-19 17:15 ` [PATCH 07/17] coresight: tmc etr: Add transparent buffer management Suzuki K Poulose
2017-11-02 17:48 ` Mathieu Poirier
2017-11-03 10:02 ` Suzuki K Poulose
2017-11-03 20:13 ` Mathieu Poirier
2017-10-19 17:15 ` Suzuki K Poulose [this message]
2017-11-02 19:26 ` [PATCH 08/17] coresight: tmc: Add configuration support for trace buffer size Mathieu Poirier
2017-10-19 17:15 ` [PATCH 09/17] coresight: Convert driver messages to dev_dbg Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 10/17] coresight: etr: Track if the device is coherent Suzuki K Poulose
2017-11-02 19:40 ` Mathieu Poirier
2017-11-03 10:03 ` Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 11/17] coresight etr: Handle driver mode specific ETR buffers Suzuki K Poulose
2017-11-02 20:26 ` Mathieu Poirier
2017-11-03 10:08 ` Suzuki K Poulose
2017-11-03 20:30 ` Mathieu Poirier
2017-10-19 17:15 ` [PATCH 12/17] coresight etr: Relax collection of trace from sysfs mode Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 13/17] coresight etr: Do not clean ETR trace buffer Suzuki K Poulose
2017-11-02 20:36 ` Mathieu Poirier
2017-11-03 10:10 ` Suzuki K Poulose
2017-11-03 20:17 ` Mathieu Poirier
2017-11-07 10:37 ` Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 14/17] coresight: etr: Add support for save restore buffers Suzuki K Poulose
2017-11-03 22:22 ` Mathieu Poirier
2017-10-19 17:15 ` [PATCH 15/17] coresight: etr_buf: Add helper for padding an area of trace data Suzuki K Poulose
2017-10-19 17:15 ` [PATCH 16/17] coresight: perf: Remove reset_buffer call back for sinks Suzuki K Poulose
2017-11-06 21:10 ` Mathieu Poirier
2017-10-19 17:15 ` [PATCH 17/17] coresight perf: Add ETR backend support for etm-perf Suzuki K Poulose
2017-11-07 0:24 ` Mathieu Poirier
2017-11-07 10:52 ` Suzuki K Poulose
2017-11-07 15:17 ` Mike Leach
2017-11-07 15:46 ` Mathieu Poirier
2017-10-20 11:00 ` [PATCH 00/17] coresight: perf: TMC ETR backend support Suzuki K Poulose
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