linux-kernel - Re: [RESEND PATCH V4 0/4] Introduce CoreSight STM support

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Message-ID: <CANLsYkyZODA6dHpKZfx2DPaZ0qe==6T1FGgR5ajZASGmcuJXhw@mail.gmail.com>
Date:	Fri, 25 Mar 2016 06:51:48 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Mike Leach <mike.leach@....com>,
	Michael Williams <Michael.Williams@....com>,
	Al Grant <al.grant@....com>, "Jeremiassen, Tor" <tor@...com>,
	Nicolas GUION <nicolas.guion@...com>,
	Pratik Patel <pratikp@...eaurora.org>,
	Lyra Zhang <zhang.lyra@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-api@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [RESEND PATCH V4 0/4] Introduce CoreSight STM support

On 7 March 2016 at 23:33, Chunyan Zhang <zhang.chunyan@...aro.org> wrote:
> This patchset adds support for the CoreSight STM IP block.
>
> In the fourth version, comments from various people have been
> addressed.  Representing configurations where channels are shared
> between multiple masterIDs has been kept unchanged from the previous
> version because a viable alternative hasn't been suggested.
>
> This RESEND PATCH 1/4 depends on the patch [3] which has been
> merged into linux-next.

We are not going anywhere with 1/4.  Since the functionality conveyed
by that patch isn't strictly needed simply drop it (along with 2/4).
Please take into consideration the comments I made on 4/4 and respin
on 4.6-rc1 when it comes out.

Thanks,
Mathieu

>
> Changes from V3:
>  - Removed ioctl get_options interface from the generic STM code and CoreSight STM driver.
>  - Removed 'write_max' from the structure 'stm_drvdata', and changed 'write_64bit' to 'write_bytes'.
>  - Revised stm_fundamental_data_size() to return the fundamental data size instead of 0/1.
>  - Removed stm_remove() from the driver.
>  - Revised the return value of ::packet() callback function according to [2].
>  - Modified stm_send() to send one STP packet at a time.
>  - Added comments to invariant/guaranteed CoreSight STM transaction mode.
>
> Changes from V2:
>  - Changed to return -EFAULT if failed on the command STP_GET_OPTIONS.
>  - Used Alex's patch [1] instead of the last 2/6.
>  - Removed the while loop from stm_send(), since the packet size passed
>    to it isn't larger than 4 bytes on 32-bit system and 8 bytes on
>    64-bit system.
>  - Removed stm_send_64bit(), since the process of packets on 64-bit
>    CS-STM should be basically the same with on 32-bit system, except the
>    maximum length of writing STM at a time.
>  - Removed the support of writing 64-bit to CoreSight STM buffer at a time
>    on 32-bit ARM architecture according to an ARM engineer suggestion.  As
>    he said that the STM might receive a 64-bit write, or might receive a
>    pair of 32-bit writes to the two addressed words in either order.
>    So 64-bit write isn't guaranteed to work on the ARM 32-bit architecture.
>
> Changes from v1:
>  - Added a definition of coresight_simple_func() in CS-STM driver to
>    avoid the kbuild test robot error for the time being.  This
>    modification will be removed when merging the code in which the
>    coresight_simple_func() has been moved to the header file.
>  - Calculate the channel number according to the channel memory space size.
>
>
> Thanks,
> Chunyan
>
> [1] https://lkml.org/lkml/2016/2/4/652
> [2] https://lkml.org/lkml/2016/2/12/397
> [3] https://lkml.org/lkml/2015/12/22/348
>
> Chunyan Zhang (1):
>   Documentations: Add explanations of the case for non-configurable
>     masters
>
> Mathieu Poirier (2):
>   stm class: provision for statically assigned masterIDs
>   coresight-stm: Bindings for System Trace Macrocell
>
> Pratik Patel (1):
>   coresight-stm: adding driver for CoreSight STM component
>
>  .../ABI/testing/sysfs-bus-coresight-devices-stm    |  53 ++
>  .../devicetree/bindings/arm/coresight.txt          |  28 +
>  Documentation/trace/coresight.txt                  |  37 +-
>  Documentation/trace/stm.txt                        |   6 +
>  drivers/hwtracing/coresight/Kconfig                |  11 +
>  drivers/hwtracing/coresight/Makefile               |   1 +
>  drivers/hwtracing/coresight/coresight-stm.c        | 890 +++++++++++++++++++++
>  drivers/hwtracing/stm/core.c                       |  17 +-
>  drivers/hwtracing/stm/policy.c                     |  18 +-
>  include/linux/coresight-stm.h                      |   6 +
>  include/linux/stm.h                                |   8 +
>  include/uapi/linux/coresight-stm.h                 |  21 +
>  12 files changed, 1090 insertions(+), 6 deletions(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-stm
>  create mode 100644 drivers/hwtracing/coresight/coresight-stm.c
>  create mode 100644 include/linux/coresight-stm.h
>  create mode 100644 include/uapi/linux/coresight-stm.h
>
> --
> 1.9.1
>