On 11/16/2017 01:49 AM, Balbir Singh wrote: > On Thu, Oct 26, 2017 at 2:27 AM, Guilherme G. Piccoli > <gpicc...@linux.vnet.ibm.com> wrote: >> During a kdump kernel boot in PowerPC, we request a reset of the PHBs >> to the FW. It makes sense, since if we are booting a kdump kernel it >> means we had some trouble before and we cannot rely in the adapters' >> health; they could be in a bad state, hence the reset is needed. >> >> But this reset is useful not only in kdump - there are situations, >> specially when debugging drivers, that we could break an adapter in >> a way it requires such reset. One can tell to just go ahead and >> reboot the machine, but happens that many times doing kexec is much >> faster, and so preferable than a full power cycle. >> >> This patch adds the pci_reset_phbs parameter to perform such reset >> when desired by the user. >> > > Do we care to reset specific phbs or all of them? I guess all based on > your description.
Exactly Balbir, it does reset all of them. We could add such granularity, but I don't see much usability.. But if somebody feels it's useful, we can change... Thanks! > > Balbir Singh. >
