tune usb irq (dwc3) based on usb function

This among other things greatly increases tethering performance.

Bug: 202103325
Test: tput improved
(synced from commit f9e02b98b8243d2db566df16d4e763250ac9efaf)

Change-Id: I19b22d748352eb04bc27d85c0f69fa2571b63d53

conf/init.gs201.usb.rc

@@ -89,6 +89,12 @@ on property:vendor.usb.config=*
 on property:persist.vendor.usb.usbradio.config=*
    start usbd
 
+on property:vendor.usb.dwc3_irq=medium
+   exec /vendor/bin/hw/set_usb_irq.sh medium
+
+on property:vendor.usb.dwc3_irq=big
+   exec /vendor/bin/hw/set_usb_irq.sh big
+
 on charger
     mkdir /config/usb_gadget/g1
     mkdir /config/usb_gadget/g1/strings/0x409

device.mk

@@ -264,6 +264,7 @@ PRODUCT_COPY_FILES += \
 # Shell scripts
 PRODUCT_COPY_FILES += \
 	device/google/gs201/init.insmod.sh:$(TARGET_COPY_OUT_VENDOR)/bin/init.insmod.sh \
+	device/google/$(TARGET_BOARD_PLATFORM)/set_usb_irq.sh:$(TARGET_COPY_OUT_VENDOR)/bin/hw/set_usb_irq.sh
 
 # insmod files
 PRODUCT_COPY_FILES += \

set_usb_irq.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Switch into /proc/irq/$IRQ for the dwc3 usb controller
+cd /proc/irq/*/dwc3/.. || exit 7
+
+# Move the USB Controller (DWC3) interrupt as requested
+# Modem and DIT are on 0/2/5 depending on throughput, so avoid those.
+# 0-3 small, 4-5 medium, 6-7 big
+case "$1" in
+  medium) core=4;;
+  big) core=6;;
+  *) core=0;;
+esac
+
+# This can sometimes fail due to smp_affinity_list no longer existing...
+echo "${core}" > smp_affinity_list

usb/UsbGadget.cpp

@@ -390,6 +390,12 @@ Return<void> UsbGadget::setCurrentUsbFunctions(uint64_t functions,
         goto error;
     }
 
+    if (functions & GadgetFunction::NCM) {
+        SetProperty("vendor.usb.dwc3_irq", "big");
+    } else {
+        SetProperty("vendor.usb.dwc3_irq", "medium");
+    }
+
     ALOGI("Usb Gadget setcurrent functions called successfully");
     return Void();