linux: mts: fix NAPI poll storm that pins a CPU when the NIC MSI never fires (#14)

The PS5 GbE NIC has no INTx pin and its MSI sometimes never fires after a
cold boot. The driver already works around that with a 1 Hz link-poll
watchdog that kicks NAPI by hand.

But gbe_poll() re-checks GBE_REG_ISR after completing NAPI and reschedules
itself whenever a GBE_IER_MASK cause is still latched, without ever
acknowledging (W1C) the ISR -- only the hardware handler gbe_isr() does.
When the MSI is dead gbe_isr() never runs, so the latched cause (e.g.
RX_DONE) is never cleared, the re-check stays true forever, and NAPI
reschedules itself ~30k times/s, pinning ksoftirqd on that CPU at 100%.

Acknowledge the pending causes before re-kicking so a stale, undelivered
cause can no longer spin NAPI.

While the MSI is dead also poll the rings every GBE_POLL_FALLBACK_MS (10 ms)
instead of once per second, so interactive RX latency drops from ~1 s to a
few ms; fall back to HZ as soon as real IRQs start arriving.

.config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 7.0.5 Kernel Configuration
+# Linux/x86 7.0.10 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 15.2.0-16ubuntu1) 15.2.0"
 CONFIG_CC_IS_GCC=y
@@ -1408,8 +1408,8 @@ CONFIG_NFT_LIMIT=m
 CONFIG_NFT_MASQ=m
 CONFIG_NFT_REDIR=m
 CONFIG_NFT_NAT=m
-# CONFIG_NFT_TUNNEL is not set
+CONFIG_NFT_TUNNEL=m
-# CONFIG_NFT_QUEUE is not set
+CONFIG_NFT_QUEUE=m
 # CONFIG_NFT_QUOTA is not set
 CONFIG_NFT_REJECT=m
 CONFIG_NFT_REJECT_INET=m
@@ -2015,6 +2015,7 @@ CONFIG_PNPACPI=y
 CONFIG_BLK_DEV=y
 # CONFIG_BLK_DEV_NULL_BLK is not set
 # CONFIG_BLK_DEV_FD is not set
+CONFIG_CDROM=y
 # CONFIG_BLK_DEV_PCIESSD_MTIP32XX is not set
 CONFIG_ZRAM=m
 CONFIG_ZRAM_BACKEND_LZ4=y
@@ -2132,7 +2133,7 @@ CONFIG_SCSI_PROC_FS=y
 #
 CONFIG_BLK_DEV_SD=y
 # CONFIG_CHR_DEV_ST is not set
-# CONFIG_BLK_DEV_SR is not set
+CONFIG_BLK_DEV_SR=y
 CONFIG_CHR_DEV_SG=y
 CONFIG_BLK_DEV_BSG=y
 # CONFIG_CHR_DEV_SCH is not set
@@ -2155,7 +2156,102 @@ CONFIG_SCSI_SCAN_ASYNC=y
 # CONFIG_SCSI_DH is not set
 # end of SCSI device support
 
-# CONFIG_ATA is not set
+CONFIG_ATA=y
+CONFIG_SATA_HOST=y
+CONFIG_PATA_TIMINGS=y
+CONFIG_ATA_VERBOSE_ERROR=y
+CONFIG_ATA_FORCE=y
+CONFIG_ATA_ACPI=y
+# CONFIG_SATA_ZPODD is not set
+CONFIG_SATA_PMP=y
+
+#
+# Controllers with non-SFF native interface
+#
+# CONFIG_SATA_AHCI is not set
+# CONFIG_SATA_AHCI_PLATFORM is not set
+# CONFIG_AHCI_DWC is not set
+CONFIG_AHCI_SALINA=m
+# CONFIG_SATA_INIC162X is not set
+# CONFIG_SATA_ACARD_AHCI is not set
+# CONFIG_SATA_SIL24 is not set
+CONFIG_ATA_SFF=y
+
+#
+# SFF controllers with custom DMA interface
+#
+# CONFIG_PDC_ADMA is not set
+# CONFIG_SATA_QSTOR is not set
+# CONFIG_SATA_SX4 is not set
+CONFIG_ATA_BMDMA=y
+
+#
+# SATA SFF controllers with BMDMA
+#
+# CONFIG_ATA_PIIX is not set
+# CONFIG_SATA_DWC is not set
+# CONFIG_SATA_MV is not set
+# CONFIG_SATA_NV is not set
+# CONFIG_SATA_PROMISE is not set
+# CONFIG_SATA_SIL is not set
+# CONFIG_SATA_SIS is not set
+# CONFIG_SATA_SVW is not set
+# CONFIG_SATA_ULI is not set
+# CONFIG_SATA_VIA is not set
+# CONFIG_SATA_VITESSE is not set
+
+#
+# PATA SFF controllers with BMDMA
+#
+# CONFIG_PATA_ALI is not set
+# CONFIG_PATA_AMD is not set
+# CONFIG_PATA_ARTOP is not set
+# CONFIG_PATA_ATIIXP is not set
+# CONFIG_PATA_ATP867X is not set
+# CONFIG_PATA_CMD64X is not set
+# CONFIG_PATA_CYPRESS is not set
+# CONFIG_PATA_EFAR is not set
+# CONFIG_PATA_HPT366 is not set
+# CONFIG_PATA_HPT37X is not set
+# CONFIG_PATA_HPT3X2N is not set
+# CONFIG_PATA_HPT3X3 is not set
+# CONFIG_PATA_IT8213 is not set
+# CONFIG_PATA_IT821X is not set
+# CONFIG_PATA_JMICRON is not set
+# CONFIG_PATA_MARVELL is not set
+# CONFIG_PATA_NETCELL is not set
+# CONFIG_PATA_NINJA32 is not set
+# CONFIG_PATA_NS87415 is not set
+# CONFIG_PATA_OLDPIIX is not set
+# CONFIG_PATA_OPTIDMA is not set
+# CONFIG_PATA_PDC2027X is not set
+# CONFIG_PATA_PDC_OLD is not set
+# CONFIG_PATA_RADISYS is not set
+# CONFIG_PATA_RDC is not set
+# CONFIG_PATA_SCH is not set
+# CONFIG_PATA_SERVERWORKS is not set
+# CONFIG_PATA_SIL680 is not set
+# CONFIG_PATA_SIS is not set
+# CONFIG_PATA_TOSHIBA is not set
+# CONFIG_PATA_TRIFLEX is not set
+# CONFIG_PATA_VIA is not set
+# CONFIG_PATA_WINBOND is not set
+
+#
+# PIO-only SFF controllers
+#
+# CONFIG_PATA_CMD640_PCI is not set
+# CONFIG_PATA_MPIIX is not set
+# CONFIG_PATA_NS87410 is not set
+# CONFIG_PATA_OPTI is not set
+# CONFIG_PATA_RZ1000 is not set
+
+#
+# Generic fallback / legacy drivers
+#
+# CONFIG_PATA_ACPI is not set
+# CONFIG_ATA_GENERIC is not set
+# CONFIG_PATA_LEGACY is not set
 CONFIG_MD=y
 CONFIG_BLK_DEV_MD=y
 CONFIG_MD_BITMAP=y
@@ -2402,6 +2498,7 @@ CONFIG_SMSC_PHY=m
 # CONFIG_DP83TG720_PHY is not set
 # CONFIG_VITESSE_PHY is not set
 # CONFIG_XILINX_GMII2RGMII is not set
+CONFIG_MTS=m
 CONFIG_FWNODE_MDIO=y
 CONFIG_ACPI_MDIO=y
 # CONFIG_MDIO_BITBANG is not set
@@ -3024,6 +3121,7 @@ CONFIG_SENSORS_K10TEMP=m
 # CONFIG_SENSORS_CHIPCAP2 is not set
 # CONFIG_SENSORS_CORSAIR_CPRO is not set
 # CONFIG_SENSORS_CORSAIR_PSU is not set
+# CONFIG_SENSORS_DRIVETEMP is not set
 # CONFIG_SENSORS_DS620 is not set
 # CONFIG_SENSORS_DS1621 is not set
 # CONFIG_SENSORS_DELL_SMM is not set
@@ -4175,6 +4273,7 @@ CONFIG_LEDS_CLASS_MULTICOLOR=m
 CONFIG_LEDS_TRIGGERS=y
 # CONFIG_LEDS_TRIGGER_TIMER is not set
 # CONFIG_LEDS_TRIGGER_ONESHOT is not set
+# CONFIG_LEDS_TRIGGER_DISK is not set
 # CONFIG_LEDS_TRIGGER_HEARTBEAT is not set
 # CONFIG_LEDS_TRIGGER_BACKLIGHT is not set
 # CONFIG_LEDS_TRIGGER_CPU is not set

README.md

@@ -6,7 +6,7 @@
 git clone https://github.com/ps5-linux/ps5-linux-patches
 git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
 cd linux
-git checkout tags/v7.0.5
+git checkout "tags/v$(grep -m1 "^# Linux/" ../ps5-linux-patches/.config | awk '{print $3}')"
 git apply ../ps5-linux-patches/linux.patch
 cp ../ps5-linux-patches/.config .config
 make -j$(nproc)
@@ -21,30 +21,10 @@ sudo make modules_install
 sudo make install
 ```
 
-If you use Arch Linux, then additionally do:
-
-```bash
-sudo mkinitcpio -k "$(make kernelrelease)" -g /boot/initrd.img-$(make kernelrelease) || true
-```
-
-If you are updating Linux on your external USB SSD or if you are directly booting into M.2 SSD, i.e. if you use `-m2` in `cmdline.txt`, then you have to update the files on the FAT32 partition of your USB drive:
-
-```bash
-sudo mv /boot/efi/bzImage /boot/efi/bzImage.old
-sudo mv /boot/efi/initrd.img /boot/efi/initrd.img.old
-sudo cp /boot/vmlinuz /boot/efi/bzImage
-sudo cp /boot/initrd.img /boot/efi/initrd.img
-```
-
-If you are updating Linux on your M.2 SSD, but you do not directly boot into it, i.e. if you use `m2_exec.sh`, then you do need to do this step.
-
-
 ## TODO
 
 - amdgpu smu driver to show correct gpu frequency and temperature
-- ethernet driver for (mediatek?) 0x104d:0x9104
 - xhci driver adjustment for 0x104d:0x9108 to enable bluetooth
-- wlan driver marvell 1b4b:2b56 (https://github.com/nxp-imx/mwifiex)
 - hdmi converter improvments: hdr, rgb range, 120hz
 
 ## Bugs