[PATCH V10 0/2] Add support for UltraSoc System Memory Buffer

From: Junhao He
Date: Sat Oct 22 2022 - 07:58:55 EST


Add support for UltraSoc System Memory Buffer.

Change since v9:
- Update the Contact tag in SMB document.
- Replace the spinlock with mutex.
- Do some clean-ups in "smb_enable()" and "smb_release()".
- Use classic memory mapped interface.
- Link: https://lore.kernel.org/linux-arm-kernel/20220818132231.28240-1-hejunhao3@xxxxxxxxxx/

Change since v8:
- Insert a blank line at the end of the config tag in Kconfig.
- Fix the "llseek" initialization.
- Link: https://lore.kernel.org/linux-arm-kernel/20220816131634.38195-1-hejunhao3@xxxxxxxxxx/

Change since v7:
- Use the macros for register bit flags and numbers of resource.
- Fix punctuation.
- Update the Date tag and the KernelVersion tag in the document.
- Link: https://lore.kernel.org/lkml/20220712091353.34540-1-hejunhao3@xxxxxxxxxx/

Change since v6:
- Modify the code style and driver description according to Suzuki's comment.
- Modify configuration of "drvdata->reading", to void problems in open/read
concurrency scenario.
- Rename the macro of "SMB_FLOW_MASK".
- Use the "handle->head" to determine the page number and offset.
- Link: https://lore.kernel.org/linux-arm-kernel/20220606130223.57354-1-liuqi115@xxxxxxxxxx/

Change since v5:
- Address the comments from Suzuki, add some comments in SMB document, and modify
configuration of "drvdata->reading", to void problems in multi-core concurrency scenario
- Link: https://lore.kernel.org/linux-arm-kernel/20220416083953.52610-1-liuqi115@xxxxxxxxxx/

Change since v4:
- Add a simple document of SMB driver according to Suzuki's comment.
- Address the comments from Suzuki.
- Link: https://lore.kernel.org/linux-arm-kernel/20220128061755.31909-1-liuqi115@xxxxxxxxxx/

Change since v3:
- Modify the file header according to community specifications.
- Address the comments from Mathieu.
- Link: https://lore.kernel.org/linux-arm-kernel/20211118110016.40398-1-liuqi115@xxxxxxxxxx/

Change since v2:
- Move ultrasoc driver to drivers/hwtracing/coresight.
- Link: https://lists.linaro.org/pipermail/coresight/2021-November/007310.html

Change since v1:
- Drop the document of UltraSoc according to Mathieu's comment.
- Add comments to explain some private hardware settings.
- Address the comments from Mathieu.
- Link: https://lists.linaro.org/pipermail/coresight/2021-August/006842.html

Change since RFC:
- Move driver to drivers/hwtracing/coresight/ultrasoc.
- Remove ultrasoc-axi-com.c, as AXI-COM doesn't need to be configured in
basic tracing function.
- Remove ultrasoc.c as SMB does not need to register with the ultrasoc core.
- Address the comments from Mathieu and Suzuki.
- Link: https://lists.linaro.org/pipermail/coresight/2021-June/006535.html

Qi Liu (2):
drivers/coresight: Add UltraSoc System Memory Buffer driver
Documentation: Add document for UltraSoc SMB drivers

.../sysfs-bus-coresight-devices-ultra_smb | 31 +
.../trace/coresight/ultrasoc-smb.rst | 80 +++
drivers/hwtracing/coresight/Kconfig | 11 +
drivers/hwtracing/coresight/Makefile | 1 +
drivers/hwtracing/coresight/ultrasoc-smb.c | 635 ++++++++++++++++++
drivers/hwtracing/coresight/ultrasoc-smb.h | 116 ++++
6 files changed, 874 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-ultra_smb
create mode 100644 Documentation/trace/coresight/ultrasoc-smb.rst
create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.c
create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.h

--
2.33.0