Add support for UltraSoc System Memory Buffer.

Change since v12:
- Modify the code style and add "#ifdef CONFIG_ACPI" according to Jonathan's comment.
- Address the comments from Yicong.
- Link: https://lore.kernel.org/lkml/20221109135008.9485-1-hejunhao3@huawei.com/

Change since v11:
- Modify the code style and rename the macro according to Jonathan's comment.
- Link: https://lore.kernel.org/lkml/20221107130624.59886-1-hejunhao3@huawei.com/

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/20221022115929.7503-1-hejunhao3@huawei.com/

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@huawei.com/

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/20220816131634.38195-1-hejunhao3@huawei.com/

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/20220712091353.34540-1-hejunhao3@huawei.com/

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@huawei.com/

  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@huawei.com/

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@huawei.com/

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@huawei.com/

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 drivers

 .../sysfs-bus-coresight-devices-ultra_smb     |  31 +
 .../trace/coresight/ultrasoc-smb.rst          |  82 +++
 drivers/hwtracing/coresight/Kconfig           |  11 +
 drivers/hwtracing/coresight/Makefile          |   1 +
 drivers/hwtracing/coresight/ultrasoc-smb.c    | 646 ++++++++++++++++++
 drivers/hwtracing/coresight/ultrasoc-smb.h    | 120 ++++
 6 files changed, 891 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

On Mon, Nov 14, 2022 at 05:03:14PM +0800, Junhao He wrote:
> Add support for UltraSoc System Memory Buffer.
> 

The cover letter message (aside changelogs) is short but LGTM. However,
for individual patches description, please write in imperative mood
(that is, no "This patch/commit does foo" but "Do foo" instead).

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

Hi Bagas,

On 2022/11/14 21:11, Bagas Sanjaya wrote:
> On Mon, Nov 14, 2022 at 05:03:14PM +0800, Junhao He wrote:
>> Add support for UltraSoc System Memory Buffer.
>>
> The cover letter message (aside changelogs) is short but LGTM. However,
> for individual patches description, please write in imperative mood
> (that is, no "This patch/commit does foo" but "Do foo" instead).
>
> Thanks.
Yes, I will do that.

Best regards,
Junhao.