[v14,0/2] Add support for UltraSoc System Memory Buffer

Message

Junhao He Nov. 23, 2022, 12:38 p.m. UTC

Add support for UltraSoc System Memory Buffer.

Change since v13:
- Modify document and the patches description according to Bagas's comment.
- Add dependency on config ACPI, drop redundant enable hw in smb_update_buffer(),
  Modify smb_purge_data() description according to Suzuki's comment.
- Link: https://lore.kernel.org/lkml/[e-mail]/

Change since v12:
- Modify the code style and add "#ifdef CONFIG_ACPI" according to Jonathan's comment.
- Address the comments from Yicong, included drop "buf_base"__iomem attribute,
  modify the "reading" type to bool and fix FIELD_PREP.
- Link: https://lore.kernel.org/lkml/[e-mail]/

Change since v11:
- Modify the code style and rename the macro according to Jonathan's comment.
- Link: https://lore.kernel.org/lkml/[e-mail]/

Change since v10:
- Rebase onto v6.1-rc4, included similar sysfs register accessors (as same as James's patch)
- Link: https://lore.kernel.org/lkml/[e-mail]/

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/[e-mail]/

Change since v8:
- Insert a blank line at the end of the config tag in Kconfig according to Randy's comment.
- Link: https://lore.kernel.org/linux-arm-kernel/[e-mail]/

Change since v7:
- Use the macros for register bit flags and numbers of resource.
- Cleanup punctuation.
- Update the Date tag and the KernelVersion tag in the document.
- Link: https://lore.kernel.org/lkml/[e-mail]/

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/[e-mail]/

  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/[e-mail]/

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/[e-mail]/

Change since v3:
- Modify the file header according to community specifications.
- Address the comments from Mathieu.
- Link: https://lore.kernel.org/linux-arm-kernel/[e-mail]/

Change since v2:
- Move ultrasoc driver to drivers/hwtracing/coresight by Mathieu's comment.
- 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 driver

 .../sysfs-bus-coresight-devices-ultra_smb     |  31 +
 .../trace/coresight/ultrasoc-smb.rst          |  83 +++
 drivers/hwtracing/coresight/Kconfig           |  12 +
 drivers/hwtracing/coresight/Makefile          |   1 +
 drivers/hwtracing/coresight/ultrasoc-smb.c    | 658 ++++++++++++++++++
 drivers/hwtracing/coresight/ultrasoc-smb.h    | 129 ++++
 6 files changed, 914 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