Hi Mark, Lurndal, On 21 March 2017 at 02:50, Lurndal, Scott <Scott.Lurndal@xxxxxxxxxx> wrote: > On Mon, Mar 20, 2017 at 06:09:50PM +0000, Mark Rutland wrote: >> On Tue, Mar 21, 2017 at 01:57:58AM +0800, Fu Wei wrote: >> > On 18 March 2017 at 04:01, Mark Rutland <mark.rutland@xxxxxxx> wrote: >> > > On Tue, Feb 07, 2017 at 02:50:15AM +0800, fu.wei@xxxxxxxxxx wrote: >> >> > > I've not been able to find where the ACPI spec says that zero is not a >> > > valid GSIV. This may simply be an oversight/ambiguity in the spec. >> > > >> > > Is there any statement to that effect? >> > >> > you are right, zero is a valid GSIV, I will delete this check. Thanks >> >> That being the case, how does one describe a watchdog that does not have >> an interrupt? >> >> As I mentioned, I think this is an oversight/ambiguity in the spec tat >> we should address. >> >> > > My reading of SBSA is that there is one watchdog in the system. >> > > >> > > Is that not the case? >> > >> > do you mean: >> > --------------- >> > 4.2.4 Watchdogs >> > The base server system implements a Generic Watchdog as specified in >> > APPENDIX A: Generic Watchdog. >> > --------------- >> > >> > I am not sure about that if this is saying "we only have one SBSA >> > watchdog in a system" >> > >> > would you let me know where mention it? Do I miss something? >> >> My reading was that the 'a' above meant a single element. i.e. >> >> The base server system implements _a_ Generic Watchdog as >> specified in APPENDIX A: Generic Watchdog. > > It is a requirement of a conforming implementation that there > be a generic watchdog (impl as per the appendix). That doesn't preclude > an implmentation from providing additional watchdogs (for example, if > the processor implements EL3, it is likely that an implementation > will include a secure watchdog as well as a non-secure watchdog). > > The SBSA describes the minimal hardware requirements for a > compliant server. So I think, for the SBSA watchdog: (1) there maybe more then one non-secure watchdog in GTDT (2) we may also need to skip secure watchdogs in GTDT, and only register non-secure watchdogs into platform resources. Please correct me, if I misunderstand something. > > scott -- Best regards, Fu Wei Software Engineer Red Hat -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
