diff options
| author |   Suzuki K Poulose <suzuki.poulose@arm.com> | 2018-07-11 13:40:24 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-15 13:52:57 +0200 |
| commit | c34cc23f1dcb77c66b5cd074f83dee61bfcbe567 (patch) | |
| tree | 2e8a321ad3870577ee129a0c4fe4332335a8655c /Documentation | |
| parent | coresight: tmc-etr buf: Add TMC scatter gather mode backend (diff) | |
| download | linux-dev-c34cc23f1dcb77c66b5cd074f83dee61bfcbe567.tar.xz linux-dev-c34cc23f1dcb77c66b5cd074f83dee61bfcbe567.zip | |
coresight: tmc: Add configuration support for trace buffer size
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>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc | 8 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/arm/coresight.txt | 3 |
2 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc index 4fe677ed1305..ab49b9ac3bcb 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: December 2018 +KernelVersion: 4.19 +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/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt index 603d3c62e8c7..9aa30a156b57 100644 --- a/Documentation/devicetree/bindings/arm/coresight.txt +++ b/Documentation/devicetree/bindings/arm/coresight.txt @@ -84,7 +84,8 @@ its hardware characteristcs. * Optional property for TMC: * arm,buffer-size: size of contiguous buffer space for TMC ETR - (embedded trace router) + (embedded trace router). This property is obsolete. The buffer size + can be configured dynamically via buffer_size property in sysfs. * arm,scatter-gather: boolean. Indicates that the TMC-ETR can safely use the SG mode on this system. |