Hi Suzuki,
On 9/7/2023 2:31 PM, Steve Clevenger wrote:
>
> Hi Suzuki,
>
> On 9/1/2023 5:22 AM, Suzuki K Poulose wrote:
>> Hi Steve
>>
>> On 30/08/2023 17:04, Suzuki K Poulose wrote:
>>> Cc: Sudeep
>>>
>>> Hi Steve
>>>
>>> On 28/08/2023 17:35, Steve Clevenger wrote:
>>>>
>>>> Hi Suzuki,
>>>>
>>>> On 8/27/2023 2:35 PM, Suzuki K Poulose wrote:
>>>>> Hi Steve
>>>>>
>>>>> On 26/08/2023 01:14, Steve Clevenger wrote:
>>>>>>
>>>>>> Unfortunately, I tested with the original patch not [PATCH V2]. I've
>>>>>> remedied this. My results below:
>>>>>>
>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_modes_available
>>>>>> auto flat catu
>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>> auto
>>>>>> [root@sut01sys-b212 linux]# echo "catu" >
>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>> catu
>>>>>>
>>>>>> As with the V1 patch, auto defaults to catu.
>>>>>>
>>>>>> I expected to see tmc-sg (former default) as an available mode, but do
>>>>>> not. As I recall, the buffer mode defaulted to ETR scatter-gather
>>>>>> prior
>>>>>> to this patch. Must this capability now be explicitly advertised? I've
>>>>>> seen this done as "arm,scatter-gather" in device trees, but not
>>>>>> used by
>>>>>> Ampere. Perhaps someone can enlighten me.
>>>>>
>>>>> Yes, you must add that property to the TMC-ETR node (for both DT and
>>>>> ACPI). In the past, almost all of the TMC-ETRs (except Juno board)
>>>>> locked up the system while using the SG mode (due to the interconnect
>>>>> issues, something to do with the transaction). Thus, we decided to
>>>>> add a property explicitly enabling this for a given platform.
>>>>>
>>>>> When you mentioned, it was using TMC-ETR SG mode, how did you verify
>>>>> this ? Please be aware that the table allocation code etc are shared
>>>>> by both TMC-SG and CATU.
>>>>>
>>>>
>>>> You might recall how this started. I had no way to test the CATU due to
>>>> the order the ETR modes defaulted (Flat, ETR-SG, CATU). For test
>>>> purposes, I programmatically swapped the ETR-SG/CATU order and could
>>>> then verify CATU operation by the driver calling into CATU code. This
>>>
>>> So, were you using the DT based boot for the above runs ?
>>>
>>>> suggests Flat mode was bypassed, and the driver defaulted to ETR-SG
>>>> prior to this hack. This didn't offer the user any control, hence my
>>>> feature request. Note that most of the early Ampere self-hosted trace
>>>> collection used ETR-SG. Now I can't select it.
>>>
>>>
>>>>
>>>> How is this property described in the ACPI? The "ACPI for CoreSight™ 1.1
>>>> Platform Design Document" (DEN0067) doesn't describe this.
>>>
>>> This is not specified in the ACPI platform design document. I can get
>>> it fixed. Ideally we need a property describing that the scatter-gather
>>> mode is safe to use.
>>
>> Looks like this is not straight forward copying of DT property. We are
>> investigating this on our side and will get back to you.
I noticed this work is queued for 6.7 (coresight-next-6.7). Do you have
an update to the ACPI platform design document Ampere can use to base an
update so the scatter-gather mode can be used?
Thanks,
Steve
>>
>
> The intent behind my request was to have a way to SysFS configure the
> (available) ETR mode. Unless there's a change to the ACPI, the CATU is
> the only SG option for Ampere in the near term.
>
> Thanks,
> Steve
>
>
>> Suzuki
>>
>>
>>>
>>> DT uses "arm,scatter-gather" property [0] and this is what we now expect
>>> in the ACPI based systems too.
>>>
>>> https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml#:~:text=71-,72,-73
>>>
>>> Does it sound fine ?
>>>
>>> Suzuki
>>>
>>>>
>>>> Thanks,
>>>> Steve
>>>>
>>>>
>>>>> Kind regards
>>>>> Suzuki
>>>>>
>>>>>>
>>>>>> Steve C.
>>>>>>
>>>>>> On 8/23/2023 4:10 PM, Steve Clevenger wrote:
>>>>>>>
>>>>>>> Here's some quick feedback. My system shows two modes available; auto
>>>>>>> catu
>>>>>>>
>>>>>>> etr_buf_mode_current is writable. I expected to see tmc-sg (former
>>>>>>> default) listed in etr_buf_modes_available but it doesn't show up.
>>>>>>>
>>>>>>> Note that both the auto and catu etr_buf_mode_current settings
>>>>>>> default
>>>>>>> to catu. My understanding is auto should revert to the default
>>>>>>> behavior.
>>>>>>> On my system the default was tmc-sg.
>>>>>>>
>>>>>>> More later.
>>>>>>>
>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_modes_available
>>>>>>>
>>>>>>> auto catu
>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>> catu
>>>>>>> [root@sut01sys-b212 kernel]# echo "catu" >
>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>> catu
>>>>>>>
>>>>>>> Steve C.
>>>>>>>
>>>>>>>
>>>>>>> On 8/21/2023 12:40 PM, Steve Clevenger wrote:
>>>>>>>>
>>>>>>>> Hi Suzuki,
>>>>>>>>
>>>>>>>> I may be able to test it this week. You've already pointed me at the
>>>>>>>> patch thread(s). The main holdup is I need to merge the 6.6 pending
>>>>>>>> platform work in order to use the Ampere ACPI. I couldn't get these
>>>>>>>> patches to apply directly to 6.4 last I tried.
>>>>>>>>
>>>>>>>> Steve C.
>>>>>>>>
>>>>>>>> On 8/18/2023 2:39 AM, Suzuki K Poulose wrote:
>>>>>>>>> Cc: Steve
>>>>>>>>>
>>>>>>>>> Steve,
>>>>>>>>>
>>>>>>>>> Are you able to test this with CATU ?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 18/08/2023 09:21, Anshuman Khandual wrote:
>>>>>>>>>> Currently TMC-ETR automatically selects the buffer mode from all
>>>>>>>>>> available
>>>>>>>>>> methods in the following sequentially fallback manner - also in
>>>>>>>>>> that
>>>>>>>>>> order.
>>>>>>>>>>
>>>>>>>>>> 1. FLAT mode with or without IOMMU
>>>>>>>>>> 2. TMC-ETR-SG (scatter gather) mode when available
>>>>>>>>>> 3. CATU mode when available
>>>>>>>>>>
>>>>>>>>>> But this order might not be ideal for all situations. For
>>>>>>>>>> example if
>>>>>>>>>> there
>>>>>>>>>> is a CATU connected to ETR, it may be better to use TMC-ETR
>>>>>>>>>> scatter
>>>>>>>>>> gather
>>>>>>>>>> method, rather than CATU. But hard coding such order changes will
>>>>>>>>>> prevent
>>>>>>>>>> us from testing or using a particular mode. This change provides
>>>>>>>>>> following
>>>>>>>>>> new sysfs tunables for the user to control TMC-ETR buffer mode
>>>>>>>>>> explicitly,
>>>>>>>>>> if required. This adds following new sysfs files for buffer mode
>>>>>>>>>> selection
>>>>>>>>>> purpose explicitly in the user space.
>>>>>>>>>>
>>>>>>>>>> /sys/bus/coresight/devices/tmc_etr<N>/buf_modes_available
>>>>>>>>>> /sys/bus/coresight/devices/tmc_etr<N>/buf_mode_preferred
>>>>>>>>>>
>>>>>>>>>> $ cat buf_modes_available
>>>>>>>>>> auto flat tmc-sg catu ------------------> Supported TMC-ETR
>>>>>>>>>> buffer
>>>>>>>>>> modes
>>>>>>>>>>
>>>>>>>>>> $ echo catu > buf_mode_preferred -------> Explicit buffer mode
>>>>>>>>>> request
>>>>>>>>>>
>>>>>>>>>> But explicit user request has to be within supported ETR buffer
>>>>>>>>>> modes
>>>>>>>>>> only.
>>>>>>>>>> These sysfs interface files are exclussive to ETR, and hence these
>>>>>>>>>> are
>>>>>>>>>> not
>>>>>>>>>> available for other TMC devices such as ETB or ETF etc.
>>>>>>>>>>
>>>>>>>>>> A new auto' mode (i.e ETR_MODE_AUTO) has been added to help
>>>>>>>>>> fallback
>>>>>>>>>> to the
>>>>>>>>>> existing default behaviour, when user provided preferred buffer
>>>>>>>>>> mode
>>>>>>>>>> fails.
>>>>>>>>>> ETR_MODE_FLAT and ETR_MODE_AUTO are always available as preferred
>>>>>>>>>> modes.
>>>>>>>>>>
>>>>>>>>>> Cc: Suzuki K Poulose <[email protected]>
>>>>>>>>>> Cc: Mike Leach <[email protected]>
>>>>>>>>>> Cc: James Clark <[email protected]>
>>>>>>>>>> Cc: Leo Yan <[email protected]>
>>>>>>>>>> Cc: Alexander Shishkin <[email protected]>
>>>>>>>>>> Cc: [email protected]
>>>>>>>>>> Cc: [email protected]
>>>>>>>>>> Cc: [email protected]
>>>>>>>>>> Signed-off-by: Anshuman Khandual <[email protected]>
>>>>>>>>>> ---
>>>>>>>>>> This applies on v6.5-rc6
>>>>>>>>>>
>>>>>>>>>> Changes in V2:
>>>>>>>>>>
>>>>>>>>>> - Renamed sysfs file etr_buf_modes_available as
>>>>>>>>>> buf_modes_available
>>>>>>>>>> - Renamed sysfs file buf_mode_current as buf_mode_preferred
>>>>>>>>>> - Renamed etr_supports_flat_mode() as etr_can_use_flat_mode()
>>>>>>>>>> - Renamed coresight_tmc_groups[] as coresight_etf_groups[]
>>>>>>>>>> - Reused coresight_tmc_group[] for trigger_cntr and buffer_size
>>>>>>>>>> - Fallback trying ETR_MODE_AUTO when user preferred mode fails
>>>>>>>>>> - Moved ETR sysfs details into coresight-tmc-etr.c
>>>>>>>>>> - Dropped etr_can_use_flat_mode() check while offering
>>>>>>>>>> ETR_MODE_FLAT
>>>>>>>>>> in sysfs
>>>>>>>>>> - Moved struct etr_buf_hw inside coresight-tmc-etr.c
>>>>>>>>>> - Moved get_etr_buf_hw() and etr_can_use_flat_mode() inside
>>>>>>>>>> coresight-tmc-etr.c
>>>>>>>>>> - Updated month in
>>>>>>>>>> Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
>>>>>>>>>>
>>>>>>>>>> Changes in V1:
>>>>>>>>>>
>>>>>>>>>> https://lore.kernel.org/all/[email protected]/
>>>>>>>>>>
>>>>>>>>>> .../testing/sysfs-bus-coresight-devices-tmc | 16 +++
>>>>>>>>>> .../hwtracing/coresight/coresight-tmc-core.c | 15 ++-
>>>>>>>>>> .../hwtracing/coresight/coresight-tmc-etr.c | 111
>>>>>>>>>> ++++++++++++++++--
>>>>>>>>>> drivers/hwtracing/coresight/coresight-tmc.h | 3 +
>>>>>>>>>> 4 files changed, 131 insertions(+), 14 deletions(-)
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Looks good to me.
>>>>>>>>>
>>>>>>>>> Suzuki
>>>>>>>>>
>>>>>>>>>
>>>>>
>>>
>>
Hi Steve
On 04/12/2023 21:41, Steve Clevenger wrote:
>
> Hi Suzuki,
>
> On 9/7/2023 2:31 PM, Steve Clevenger wrote:
>>
>> Hi Suzuki,
>>
>> On 9/1/2023 5:22 AM, Suzuki K Poulose wrote:
>>> Hi Steve
>>>
>>> On 30/08/2023 17:04, Suzuki K Poulose wrote:
>>>> Cc: Sudeep
>>>>
>>>> Hi Steve
>>>>
>>>> On 28/08/2023 17:35, Steve Clevenger wrote:
>>>>>
>>>>> Hi Suzuki,
>>>>>
>>>>> On 8/27/2023 2:35 PM, Suzuki K Poulose wrote:
>>>>>> Hi Steve
>>>>>>
>>>>>> On 26/08/2023 01:14, Steve Clevenger wrote:
>>>>>>>
>>>>>>> Unfortunately, I tested with the original patch not [PATCH V2]. I've
>>>>>>> remedied this. My results below:
>>>>>>>
>>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_modes_available
>>>>>>> auto flat catu
>>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>>> auto
>>>>>>> [root@sut01sys-b212 linux]# echo "catu" >
>>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>>> [root@sut01sys-b212 linux]# cat
>>>>>>> /sys/devices/system/cpu/cpu123/ARMHC501\:23/tmc_etr35/buf_mode_preferred
>>>>>>> catu
>>>>>>>
>>>>>>> As with the V1 patch, auto defaults to catu.
>>>>>>>
>>>>>>> I expected to see tmc-sg (former default) as an available mode, but do
>>>>>>> not. As I recall, the buffer mode defaulted to ETR scatter-gather
>>>>>>> prior
>>>>>>> to this patch. Must this capability now be explicitly advertised? I've
>>>>>>> seen this done as "arm,scatter-gather" in device trees, but not
>>>>>>> used by
>>>>>>> Ampere. Perhaps someone can enlighten me.
>>>>>>
>>>>>> Yes, you must add that property to the TMC-ETR node (for both DT and
>>>>>> ACPI). In the past, almost all of the TMC-ETRs (except Juno board)
>>>>>> locked up the system while using the SG mode (due to the interconnect
>>>>>> issues, something to do with the transaction). Thus, we decided to
>>>>>> add a property explicitly enabling this for a given platform.
>>>>>>
>>>>>> When you mentioned, it was using TMC-ETR SG mode, how did you verify
>>>>>> this ? Please be aware that the table allocation code etc are shared
>>>>>> by both TMC-SG and CATU.
>>>>>>
>>>>>
>>>>> You might recall how this started. I had no way to test the CATU due to
>>>>> the order the ETR modes defaulted (Flat, ETR-SG, CATU). For test
>>>>> purposes, I programmatically swapped the ETR-SG/CATU order and could
>>>>> then verify CATU operation by the driver calling into CATU code. This
>>>>
>>>> So, were you using the DT based boot for the above runs ?
>>>>
>>>>> suggests Flat mode was bypassed, and the driver defaulted to ETR-SG
>>>>> prior to this hack. This didn't offer the user any control, hence my
>>>>> feature request. Note that most of the early Ampere self-hosted trace
>>>>> collection used ETR-SG. Now I can't select it.
>>>>
>>>>
>>>>>
>>>>> How is this property described in the ACPI? The "ACPI for CoreSight™ 1.1
>>>>> Platform Design Document" (DEN0067) doesn't describe this.
>>>>
>>>> This is not specified in the ACPI platform design document. I can get
>>>> it fixed. Ideally we need a property describing that the scatter-gather
>>>> mode is safe to use.
>>>
>>> Looks like this is not straight forward copying of DT property. We are
>>> investigating this on our side and will get back to you.
>
> I noticed this work is queued for 6.7 (coresight-next-6.7). Do you have
> an update to the ACPI platform design document Ampere can use to base an
> update so the scatter-gather mode can be used?
I have chased this with the specification team, and we should have
something published soon. Apologies for the delay.
Suzuki
>
> Thanks,
> Steve
>
>>>
>>
>> The intent behind my request was to have a way to SysFS configure the
>> (available) ETR mode. Unless there's a change to the ACPI, the CATU is
>> the only SG option for Ampere in the near term.
>>
>> Thanks,
>> Steve
>>
>>
>>> Suzuki
>>>
>>>
>>>>
>>>> DT uses "arm,scatter-gather" property [0] and this is what we now expect
>>>> in the ACPI based systems too.
>>>>
>>>> https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml#:~:text=71-,72,-73
>>>>
>>>> Does it sound fine ?
>>>>
>>>> Suzuki
>>>>
>>>>>
>>>>> Thanks,
>>>>> Steve
>>>>>
>>>>>
>>>>>> Kind regards
>>>>>> Suzuki
>>>>>>
>>>>>>>
>>>>>>> Steve C.
>>>>>>>
>>>>>>> On 8/23/2023 4:10 PM, Steve Clevenger wrote:
>>>>>>>>
>>>>>>>> Here's some quick feedback. My system shows two modes available; auto
>>>>>>>> catu
>>>>>>>>
>>>>>>>> etr_buf_mode_current is writable. I expected to see tmc-sg (former
>>>>>>>> default) listed in etr_buf_modes_available but it doesn't show up.
>>>>>>>>
>>>>>>>> Note that both the auto and catu etr_buf_mode_current settings
>>>>>>>> default
>>>>>>>> to catu. My understanding is auto should revert to the default
>>>>>>>> behavior.
>>>>>>>> On my system the default was tmc-sg.
>>>>>>>>
>>>>>>>> More later.
>>>>>>>>
>>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_modes_available
>>>>>>>>
>>>>>>>> auto catu
>>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>>> catu
>>>>>>>> [root@sut01sys-b212 kernel]# echo "catu" >
>>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>>> [root@sut01sys-b212 kernel]# cat
>>>>>>>> /sys/devices/system/cpu/cpu20/ARMHC501\:60/tmc_etr96/etr_buf_mode_current
>>>>>>>> catu
>>>>>>>>
>>>>>>>> Steve C.
>>>>>>>>
>>>>>>>>
>>>>>>>> On 8/21/2023 12:40 PM, Steve Clevenger wrote:
>>>>>>>>>
>>>>>>>>> Hi Suzuki,
>>>>>>>>>
>>>>>>>>> I may be able to test it this week. You've already pointed me at the
>>>>>>>>> patch thread(s). The main holdup is I need to merge the 6.6 pending
>>>>>>>>> platform work in order to use the Ampere ACPI. I couldn't get these
>>>>>>>>> patches to apply directly to 6.4 last I tried.
>>>>>>>>>
>>>>>>>>> Steve C.
>>>>>>>>>
>>>>>>>>> On 8/18/2023 2:39 AM, Suzuki K Poulose wrote:
>>>>>>>>>> Cc: Steve
>>>>>>>>>>
>>>>>>>>>> Steve,
>>>>>>>>>>
>>>>>>>>>> Are you able to test this with CATU ?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 18/08/2023 09:21, Anshuman Khandual wrote:
>>>>>>>>>>> Currently TMC-ETR automatically selects the buffer mode from all
>>>>>>>>>>> available
>>>>>>>>>>> methods in the following sequentially fallback manner - also in
>>>>>>>>>>> that
>>>>>>>>>>> order.
>>>>>>>>>>>
>>>>>>>>>>> 1. FLAT mode with or without IOMMU
>>>>>>>>>>> 2. TMC-ETR-SG (scatter gather) mode when available
>>>>>>>>>>> 3. CATU mode when available
>>>>>>>>>>>
>>>>>>>>>>> But this order might not be ideal for all situations. For
>>>>>>>>>>> example if
>>>>>>>>>>> there
>>>>>>>>>>> is a CATU connected to ETR, it may be better to use TMC-ETR
>>>>>>>>>>> scatter
>>>>>>>>>>> gather
>>>>>>>>>>> method, rather than CATU. But hard coding such order changes will
>>>>>>>>>>> prevent
>>>>>>>>>>> us from testing or using a particular mode. This change provides
>>>>>>>>>>> following
>>>>>>>>>>> new sysfs tunables for the user to control TMC-ETR buffer mode
>>>>>>>>>>> explicitly,
>>>>>>>>>>> if required. This adds following new sysfs files for buffer mode
>>>>>>>>>>> selection
>>>>>>>>>>> purpose explicitly in the user space.
>>>>>>>>>>>
>>>>>>>>>>> /sys/bus/coresight/devices/tmc_etr<N>/buf_modes_available
>>>>>>>>>>> /sys/bus/coresight/devices/tmc_etr<N>/buf_mode_preferred
>>>>>>>>>>>
>>>>>>>>>>> $ cat buf_modes_available
>>>>>>>>>>> auto flat tmc-sg catu ------------------> Supported TMC-ETR
>>>>>>>>>>> buffer
>>>>>>>>>>> modes
>>>>>>>>>>>
>>>>>>>>>>> $ echo catu > buf_mode_preferred -------> Explicit buffer mode
>>>>>>>>>>> request
>>>>>>>>>>>
>>>>>>>>>>> But explicit user request has to be within supported ETR buffer
>>>>>>>>>>> modes
>>>>>>>>>>> only.
>>>>>>>>>>> These sysfs interface files are exclussive to ETR, and hence these
>>>>>>>>>>> are
>>>>>>>>>>> not
>>>>>>>>>>> available for other TMC devices such as ETB or ETF etc.
>>>>>>>>>>>
>>>>>>>>>>> A new auto' mode (i.e ETR_MODE_AUTO) has been added to help
>>>>>>>>>>> fallback
>>>>>>>>>>> to the
>>>>>>>>>>> existing default behaviour, when user provided preferred buffer
>>>>>>>>>>> mode
>>>>>>>>>>> fails.
>>>>>>>>>>> ETR_MODE_FLAT and ETR_MODE_AUTO are always available as preferred
>>>>>>>>>>> modes.
>>>>>>>>>>>
>>>>>>>>>>> Cc: Suzuki K Poulose <[email protected]>
>>>>>>>>>>> Cc: Mike Leach <[email protected]>
>>>>>>>>>>> Cc: James Clark <[email protected]>
>>>>>>>>>>> Cc: Leo Yan <[email protected]>
>>>>>>>>>>> Cc: Alexander Shishkin <[email protected]>
>>>>>>>>>>> Cc: [email protected]
>>>>>>>>>>> Cc: [email protected]
>>>>>>>>>>> Cc: [email protected]
>>>>>>>>>>> Signed-off-by: Anshuman Khandual <[email protected]>
>>>>>>>>>>> ---
>>>>>>>>>>> This applies on v6.5-rc6
>>>>>>>>>>>
>>>>>>>>>>> Changes in V2:
>>>>>>>>>>>
>>>>>>>>>>> - Renamed sysfs file etr_buf_modes_available as
>>>>>>>>>>> buf_modes_available
>>>>>>>>>>> - Renamed sysfs file buf_mode_current as buf_mode_preferred
>>>>>>>>>>> - Renamed etr_supports_flat_mode() as etr_can_use_flat_mode()
>>>>>>>>>>> - Renamed coresight_tmc_groups[] as coresight_etf_groups[]
>>>>>>>>>>> - Reused coresight_tmc_group[] for trigger_cntr and buffer_size
>>>>>>>>>>> - Fallback trying ETR_MODE_AUTO when user preferred mode fails
>>>>>>>>>>> - Moved ETR sysfs details into coresight-tmc-etr.c
>>>>>>>>>>> - Dropped etr_can_use_flat_mode() check while offering
>>>>>>>>>>> ETR_MODE_FLAT
>>>>>>>>>>> in sysfs
>>>>>>>>>>> - Moved struct etr_buf_hw inside coresight-tmc-etr.c
>>>>>>>>>>> - Moved get_etr_buf_hw() and etr_can_use_flat_mode() inside
>>>>>>>>>>> coresight-tmc-etr.c
>>>>>>>>>>> - Updated month in
>>>>>>>>>>> Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
>>>>>>>>>>>
>>>>>>>>>>> Changes in V1:
>>>>>>>>>>>
>>>>>>>>>>> https://lore.kernel.org/all/[email protected]/
>>>>>>>>>>>
>>>>>>>>>>> .../testing/sysfs-bus-coresight-devices-tmc | 16 +++
>>>>>>>>>>> .../hwtracing/coresight/coresight-tmc-core.c | 15 ++-
>>>>>>>>>>> .../hwtracing/coresight/coresight-tmc-etr.c | 111
>>>>>>>>>>> ++++++++++++++++--
>>>>>>>>>>> drivers/hwtracing/coresight/coresight-tmc.h | 3 +
>>>>>>>>>>> 4 files changed, 131 insertions(+), 14 deletions(-)
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Looks good to me.
>>>>>>>>>>
>>>>>>>>>> Suzuki
>>>>>>>>>>
>>>>>>>>>>
>>>>>>
>>>>
>>>