[PATCH v2 0/4] pseries-wdt: initial support for H_WATCHDOG-based watchdog timers

[Tyrel Datwyler]

On 6/15/22 18:43, Daniel Henrique Barboza wrote:
> Hi,
> 
> I tried this series out with mainline QEMU built with Alexey's patch [1]
> and I wasn't able to get it to work. I'm using a simple QEMU command line
> booting a fedora36 guest in a Power9 boston host:

I would assume the H_WATCHDOG hypercall is not implemented by the qemu pseries
machine type. It is a very new hypercall.

-Tyrel

> 
> sudo  ./qemu-system-ppc64 \
> -M
> pseries,cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken,cap-ccf-assist=off,ic-mode=dual
> \
> -m 4G -accel kvm -cpu POWER9 -smp 1,maxcpus=1,threads=1,cores=1,sockets=1 \
> -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x2 \
> -drive
> file=/home/danielhb/fedora36.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2,cache=none
> \
> -device
> scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2
> \
> -device qemu-xhci,id=usb,bus=pci.0,addr=0x4 -nographic -display none
> 
> 
> Guest is running v5.19-rc2 with this series applied. Kernel config consists of
> 'pseries_le_defconfig' plus the following 'watchdog' related changes:
> 
> [root at fedora ~]# cat linux/.config | grep PSERIES_WDT
> CONFIG_PSERIES_WDT=y
> 
> [root at fedora ~]# cat linux/.config | grep -i watchdog
> CONFIG_PPC_WATCHDOG=y
> CONFIG_HAVE_NMI_WATCHDOG=y
> CONFIG_WATCHDOG=y
> CONFIG_WATCHDOG_CORE=y
> CONFIG_WATCHDOG_NOWAYOUT=y
> CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
> CONFIG_WATCHDOG_OPEN_TIMEOUT=0
> # CONFIG_WATCHDOG_SYSFS is not set
> # CONFIG_WATCHDOG_HRTIMER_PRETIMEOUT is not set
> # Watchdog Pretimeout Governors
> # CONFIG_WATCHDOG_PRETIMEOUT_GOV is not set
> # Watchdog Device Drivers
> # CONFIG_SOFT_WATCHDOG is not set
> # CONFIG_XILINX_WATCHDOG is not set
> # CONFIG_ZIIRAVE_WATCHDOG is not set
> # CONFIG_CADENCE_WATCHDOG is not set
> # CONFIG_DW_WATCHDOG is not set
> # CONFIG_MAX63XX_WATCHDOG is not set
> CONFIG_WATCHDOG_RTAS=y
> # PCI-based Watchdog Cards
> # CONFIG_PCIPCWATCHDOG is not set
> # USB-based Watchdog Cards
> # CONFIG_USBPCWATCHDOG is not set
> # CONFIG_WQ_WATCHDOG is not set
> [root at fedora ~]#
> 
> 
> 
> Kernel command line:
> 
> [root at fedora ~]# cat /proc/cmdline
> BOOT_IMAGE=(ieee1275/disk,msdos2)/vmlinuz-5.19.0-rc2-00054-g12ede8ffb103 \
> root=/dev/mapper/fedora_fedora-root ro rd.lvm.lv=fedora_fedora/root \
> pseries-wdt.timeout=60 pseries-wdt.nowayout=1 pseries-wdt.action=2
> 
> 
> With all that, executing
> 
> echo V > /dev/watchdog0
> 
> Does nothing. dmesg is clean and the guest doesn't reboot after the 60 sec
> timeout.  I also tried with PSERIES_WDT being compiled as a module instead
> of built-in. Same results.
> 
> 
> What am I missing?
> 
> 
> [1]
> https://patchwork.ozlabs.org/project/qemu-ppc/patch/20220608030153.1862335-1-aik@ozlabs.ru/
> 
> 
> 
> 
> Thanks,
> 
> 
> Daniel
> 
> 
> 
> 
> On 6/2/22 14:53, Scott Cheloha wrote:
>> PAPR v2.12 defines a new hypercall, H_WATCHDOG.  This patch series
>> adds support for this hypercall to powerpc/pseries kernels and
>> introduces a new watchdog driver, "pseries-wdt", for the virtual
>> timers exposed by the hypercall.
>>
>> This series is preceded by the following:
>>
>> RFC v1:
>> https://lore.kernel.org/linux-watchdog/20220413165104.179144-1-cheloha@linux.ibm.com/
>>
>> RFC v2:
>> https://lore.kernel.org/linux-watchdog/20220509174357.5448-1-cheloha@linux.ibm.com/
>>
>> PATCH v1:
>> https://lore.kernel.org/linux-watchdog/20220520183552.33426-1-cheloha@linux.ibm.com/
>>
>>
>> Changes of note from PATCH v1:
>>
>> - Trim down the large comment documenting the H_WATCHDOG hypercall.
>>    The comment is likely to rot, so remove anything we aren't using
>>    and anything overly obvious.
>>
>> - Remove any preprocessor definitions not actually used in the module
>>    right now.  If we want to use other features offered by the hypercall
>>    we can add them in later.  They're just clutter until then.
>>
>> - Simplify the "action" module parameter.  The value is now an index
>>    into an array of possible timeoutAction values.  This design removes
>>    the need for the custom get/set methods used in PATCH v1.
>>
>>    Now we merely need to check that the "action" value is a valid
>>    index during pseries_wdt_probe().  Easy.
>>
>> - Make the timeoutAction a member of pseries_wdt, "action".  This
>>    eliminates the use of a global variable during pseries_wdt_start().
>>
>> - Use watchdog_init_timeout() idiomatically.  Check its return value
>>    and error out of pseries_wdt_probe() if it fails.
>>
>>