mirror of https://gitee.com/openkylin/linux.git
75f4e3619f
The TMC-ETR can use the target trace buffer in two different modes. Normal physically contiguous mode and a discontiguous list pages in Scatter-Gather mode. Also we have dedicated Coresight component, CATU (Coresight Address Translation Unit) to provide improved scatter-gather mode in Coresight SoC-600. This complicates the management of the buffer used for trace, depending on the mode in which ETR is configured. So, this patch adds a transparent layer for managing the ETR buffer which abstracts the basic operations on the buffer (alloc, free, sync and retrieve the data) and uses the mode specific helpers to do the actual operation. This also allows the ETR driver to choose the best mode for a given use case and adds the flexibility to fallback to a different mode, without duplicating the code. The patch also adds the "normal" flat memory mode and switches the sysfs driver to use the new layer. 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> |
||
|---|---|---|
| .. | ||
| coresight | ||
| intel_th | ||
| stm | ||
| Kconfig | ||