Re: [PATCH v2 3/4] arm64: dts: qcom: sdm845: Add the RPMh stats node

[Caleb Connolly <caleb.connolly@linaro.org>]

On 16/08/2022 11:30, Abel Vesa wrote:
> On 22-08-15 21:34:07, Caleb Connolly wrote:
>>
>>
>> On 12/08/2022 11:12, Abel Vesa wrote:
>>> SDM845 is a special case compared to the other platforms that use RPMh
>>> stats, since it only has 2 stats (aosd and cxsd), while the others have
>>> a 3rd one (ddr).
>>>
>>> So lets add the node but with a SDM845 dedicated compatible to make
>>> the driver aware of the different stats config.
>> Hi,
>>
>> I gave this a go on the OnePlus 6, I noticed the driver is also meant to
>> read the stats for remote procs via smem, however this seems to fail for me
>> - it can't find any of the SMEM items even if I probe the driver manually
>> after ensuring remoteprocs have booted. Is this an unsupported feature on
>> SDM845?
> 
> Thanks for giving it a test.
> 
> Actually, you need to probe the qcom_stats after the remoteprocs have
> booted.

Hi, thanks for getting back to me. I did try this as mentioned above but I think I must have been 
doing something wrong as I get different behaviour now:


enchilada:/ # cat /sys/class/remoteproc/remoteproc*/state

running

running

running

running

enchilada:/ # ls /d/qcom_stats/
aosd  cxsd
enchilada:/ # rmmod qcom_stats
enchilada:/ # insmod /data/qcom_stats.ko
enchilada:/ # ls /d/qcom_stats/
adsp  aosd  cdsp  cxsd  modem  slpi



Weirdly, despite it succeeding it prints the following in dmesg with logging added to 
qcom_create_subsystem_stat_files() [1]:

[  156.540307] Couldn't get smem object 'wpss' (item: 605, pid: 13): -2
[  156.546899] Couldn't get smem object 'gpu' (item: 609, pid: 0): -2
[  156.553260] Couldn't get smem object 'display' (item: 610, pid: 0): -2
[  156.559957] Couldn't get smem object 'adsp_island' (item: 613, pid: 2): -2
[  156.567007] Couldn't get smem object 'slpi_island' (item: 613, pid: 3): -2
> 
> Doing so, you'll end up having the following:
> adsp  aosd  cdsp  cxsd

I seem to get a few more, I have some out of tree patches enabling the SLPI, and iirc the db845c 
doesn't have a full modem firmware. If these look good to you I'd appreciate it if you add my Tested-by.

enchilada:/ # for x in /d/qcom_stats/*; do echo $x; cat $x; done
/d/qcom_stats/adsp
Count: 48
Last Entered At: 1199663157
Last Exited At: 1524359015
Accumulated Duration: 793060082
/d/qcom_stats/aosd
Count: 0
Last Entered At: 0
Last Exited At: 0
Accumulated Duration: 0
/d/qcom_stats/cdsp
Count: 35
Last Entered At: 1194818037
Last Exited At: 1194769648
Accumulated Duration: 3223580811
/d/qcom_stats/cxsd
Count: 0
Last Entered At: 0
Last Exited At: 0
Accumulated Duration: 0
/d/qcom_stats/modem
Count: 49
Last Entered At: 3687081003
Last Exited At: 3686727026
Accumulated Duration: 2915592136
/d/qcom_stats/slpi
Count: 53
Last Entered At: 3120905905
Last Exited At: 3120894535
Accumulated Duration: 3218969498

Am I right in thinking the aosd and cxsd being all 0 is probably a similar issue to the one reported 
by Stephen in [2]?


[1]:

diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c
index 121ea409fafc..56cfb20d3683 100644
--- a/drivers/soc/qcom/qcom_stats.c
+++ b/drivers/soc/qcom/qcom_stats.c
@@ -178,8 +178,12 @@ static void qcom_create_subsystem_stat_files(struct dentry *root,

         for (i = 0; i < ARRAY_SIZE(subsystems); i++) {
                 stat = qcom_smem_get(subsystems[i].pid, subsystems[i].smem_item, NULL);
-               if (IS_ERR(stat))
+               if (IS_ERR(stat)) {
+                       pr_info("Couldn't get smem object '%s' (item: %d, pid: %d): %ld\n",
+                               subsystems[i].name, subsystems[i].smem_item, subsystems[i].pid,
+                               PTR_ERR(stat));
                         continue;
+               }

                 debugfs_create_file(subsystems[i].name, 0400, root, (void *)&subsystems[i],
                                     &qcom_subsystem_sleep_stats_fops);



[2]: https://lore.kernel.org/linux-arm-msm/20220628201340.3981860-1-swboyd@chromium.org/
> 
>>>
>>> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

Tested-by: Caleb Connolly <caleb.connolly@linaro.org>
>>> ---
>>>
>>> Changed qcom,rpmh-stats-sdm845 to qcom,sdm845-rpmh-stats, as suggested
>>> by Krzysztof.
>>>
>>>    arch/arm64/boot/dts/qcom/sdm845.dtsi | 5 +++++
>>>    1 file changed, 5 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> index 5bea96a9ce06..67fe08b837be 100644
>>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>> @@ -4851,6 +4851,11 @@ ebi_cdev: ebi {
>>>    			};
>>>    		};
>>>
>>> +		sram@c3f0000 {
>>> +			compatible = "qcom,sdm845-rpmh-stats";
>>> +			reg = <0 0x0c3f0000 0 0x400>;
>>> +		};
>>> +
>>>    		spmi_bus: spmi@c440000 {
>>>    			compatible = "qcom,spmi-pmic-arb";
>>>    			reg = <0 0x0c440000 0 0x1100>,
>>> --
>>> 2.34.1
>>>
>>
>> -- 
>> Kind Regards,
>> Caleb (they/he)

-- 
Kind Regards,
Caleb (they/he)