Re: [PATCH 1/2] arm64: dts: qcom: sc7180: Add gpu cooling support
From: Akhil P Oommen
Date: Fri Oct 16 2020 - 09:48:28 EST
On 10/16/2020 3:49 AM, Matthias Kaehlcke wrote:
Hi,
On Thu, Oct 15, 2020 at 12:07:01AM +0530, manafm@xxxxxxxxxxxxxx wrote:
On 2020-10-14 18:59, Akhil P Oommen wrote:
On 10/9/2020 10:27 PM, Matthias Kaehlcke wrote:
On Fri, Oct 09, 2020 at 08:05:10AM -0700, Doug Anderson wrote:
Hi,
On Thu, Oct 8, 2020 at 10:10 AM Akhil P Oommen
<akhilpo@xxxxxxxxxxxxxx> wrote:
Add cooling-cells property and the cooling maps for the gpu tzones
to support GPU cooling.
Signed-off-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxx>
---
arch/arm64/boot/dts/qcom/sc7180.dtsi | 29
++++++++++++++++++++++-------
1 file changed, 22 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi
b/arch/arm64/boot/dts/qcom/sc7180.dtsi
index d46b383..40d6a28 100644
--- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
@@ -2,7 +2,7 @@
/*
* SC7180 SoC device tree source
*
- * Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-20, The Linux Foundation. All rights
reserved.
*/
#include <dt-bindings/clock/qcom,dispcc-sc7180.h>
@@ -1885,6 +1885,7 @@
iommus = <&adreno_smmu 0>;
operating-points-v2 = <&gpu_opp_table>;
qcom,gmu = <&gmu>;
+ #cooling-cells = <2>;
Presumably we should add this to the devicetree bindings, too?
Yes, thanks for catching this. Will update in the next patch.
interconnects = <&gem_noc
MASTER_GFX3D &mc_virt SLAVE_EBI1>;
interconnect-names = "gfx-mem";
@@ -3825,16 +3826,16 @@
};
gpuss0-thermal {
- polling-delay-passive = <0>;
+ polling-delay-passive = <100>;
Why did you make this change? I'm pretty sure that we _don't_ want
this since we're using interrupts for the thermal sensor. See commit
22337b91022d ("arm64: dts: qcom: sc7180: Changed polling mode in
Thermal-zones node").
I was going to ask the same, this shouldn't be needed.
As per our understanding unlike "polling-delay", this delay property is
intended to activate polling thread on post trip threshold violation and it
is irrespective of sensor is capable for trip interrupt or not.
This polling is more of governor related. Below are the few references from
Documentation/code which tells polling-delay-passive is needed for IPA for
better IPA performance.
As per Power allocator documentations
1. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/driver-api/thermal/power_allocator.rst?h=v5.4.71#n264
"The power allocator governor's PID controller works best if there is a
periodic tick. If you have a driver that calls
`thermal_zone_device_update()` (or anything that ends up calling the
governor's `throttle()` function) repetitively, the governor response
won't be very good. Note that this is not particular to this
governor, step-wise will also misbehave if you call its throttle()
faster than the normal thermal framework tick (due to interrupts for
example) as it will overreact"
2. In Power allocator code, when switch_on/control trip temp violation, it
is enabling passive counter to activate passive polling @ https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/thermal/power_allocator.c?h=v5.4.71#n634
3. while calculating derivative term, it is using passive_delay @
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/thermal/power_allocator.c?h=v5.4.71#n243
4. Sensor interrupt will work if temperature is fluctuating between
trip_temp and hysteresis. But say a case where we are not enabling
polling-delay-passive. In this case if current temperature > control_temp
trip(2nd passive trip) and
temperature trend is still raising, then sensor high trip will be disabled
(OR configured for critical trip threshold). No more trip interrupt from
sensor until it reaches critical trip or falls below control_temp
hysteresis.
How the governor re-evaluate its next mitigation without passive polling
thread here ?
I think the same is required for CPU thermal zone as well.
Thanks for the explication and pointers!
I ran some tests to re-confirm. For that I lowered the trip point temperatures
of CPU6 to 60/70, to make it easier to trigger throttling without necessarily
affecting the other CPUs. Further I enabled tracing for the events 'thermal_temperature',
'thermal_zone_trip' and 'thermal_power_allocator'. With that I ran a CPU
intensive task on CPU6.
Without polling-delay the trace log looks like this:
irq/40-c263000.-157 [000] .... 48.035986: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=57800 temp=60000
irq/40-c263000.-157 [000] .... 48.036029: thermal_power_allocator_pid: thermal_zone_id=6 err=10000 err_integral=0 p=2402 i=0 d=0 output=1776
irq/40-c263000.-157 [000] .... 48.036036: thermal_power_allocator: thermal_zone_id=6 req_power={{0x96}} total_req_power=150 granted_power={{0x6f0}} total_granted_power=1776 power_range=1776 max_allocatable_power=1776 current_temperature=60000 delta_temperature=10000
irq/40-c263000.-157 [000] .... 52.480888: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=60000 temp=70000
irq/40-c263000.-157 [000] .... 52.480925: thermal_power_allocator_pid: thermal_zone_id=6 err=0 err_integral=0 p=0 i=0 d=0 output=1202
irq/40-c263000.-157 [000] .... 52.480931: thermal_power_allocator: thermal_zone_id=6 req_power={{0x45e}} total_req_power=1118 granted_power={{0x4b2}} total_granted_power=1202 power_range=1202 max_allocatable_power=1776 current_temperature=70000 delta_temperature=0
i.e. power_allocator only acts on the sensor interrupts at the trip points
It looks different with a non-zero value for 'polling-delay-passive':
irq/40-c263000.-156 [000] .... 104.501777: thermal_power_allocator: thermal_zone_id=6 req_power={{0x331}} total_req_power=817 granted_power={{0x591}} total_granted_power=1425 power_range=1425 max_allocatable_power=1776 current_temperature=67800 delta_temperature=2200
irq/40-c263000.-156 [000] .... 104.523073: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=67800 temp=70000
irq/40-c263000.-156 [000] .... 104.523121: thermal_power_allocator_pid: thermal_zone_id=6 err=0 err_integral=-31200 p=0 i=-305 d=0 output=897
irq/40-c263000.-156 [000] .... 104.523148: thermal_power_allocator: thermal_zone_id=6 req_power={{0x406}} total_req_power=1030 granted_power={{0x381}} total_granted_power=897 power_range=897 max_allocatable_power=1776 current_temperature=70000 delta_temperature=0
irq/40-c263000.-156 [000] .... 104.608566: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=70000 temp=67800
irq/40-c263000.-156 [000] .... 104.608612: thermal_power_allocator_pid: thermal_zone_id=6 err=2200 err_integral=-31200 p=528 i=-305 d=0 output=1425
irq/40-c263000.-156 [000] .... 104.608642: thermal_power_allocator: thermal_zone_id=6 req_power={{0x331}} total_req_power=817 granted_power={{0x591}} total_granted_power=1425 power_range=1425 max_allocatable_power=1776 current_temperature=67800 delta_temperature=2200
irq/40-c263000.-156 [000] .... 104.630863: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=67800 temp=70000
irq/40-c263000.-156 [000] .... 104.630907: thermal_power_allocator_pid: thermal_zone_id=6 err=0 err_integral=-31200 p=0 i=-305 d=0 output=897
irq/40-c263000.-156 [000] .... 104.630932: thermal_power_allocator: thermal_zone_id=6 req_power={{0x3f4}} total_req_power=1012 granted_power={{0x381}} total_granted_power=897 power_range=897 max_allocatable_power=1776 current_temperature=70000 delta_temperature=0
irq/40-c263000.-156 [000] .... 104.687495: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=70000 temp=67800
irq/40-c263000.-156 [000] .... 104.687541: thermal_power_allocator_pid: thermal_zone_id=6 err=2200 err_integral=-31200 p=528 i=-305 d=0 output=1425
irq/40-c263000.-156 [000] .... 104.687567: thermal_power_allocator: thermal_zone_id=6 req_power={{0x338}} total_req_power=824 granted_power={{0x591}} total_granted_power=1425 power_range=1425 max_allocatable_power=1776 current_temperature=67800 delta_temperature=2200
irq/40-c263000.-156 [000] .... 104.711664: thermal_temperature: thermal_zone=cpu6-thermal id=6 temp_prev=67800 temp=70000
So it seems indeed the 'polling-delay-passive' is needed for better reactivity,
and it should also be re-added to the other thermal zones.
On a different note I first tried something similar on the GPU, the trip points
triggered, however there was no reaction from power_allocator, the reason is
that there is no power information for the GPU (num power actors = 0). It seems
it doesn' make sense to use IPA as long as there is no energy model (even if it
worked by using the lowest frequency as 'estimated power' throttling would
likely be overly aggressive). Since the trip point configuration for IPA and
'step_wise' (and probably others) is somewhat incompatible (IPA aims for a
temperature around the 2nd trip point, 'step_wise' interprets the first trip
point as limit) I think it makes sense to continue with a single trip point
for now.
Thanks
Matthias
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Looks like we have consensus here. I will spin another patchset.
Manaf will share a separate patch to fix the CPU tzones.
-Akhil.