Date: Wed, 21 Apr 2021 00:38:44 +0200 From: Michael Tuexen <tuexen@freebsd.org> To: Dmitry Skorodumov <sdmitry@parallels.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: gic-v2 and SGI interrupts on boot CPU Message-ID: <2B7A227B-245F-4F1B-A700-263C3FE56B68@freebsd.org> In-Reply-To: <YQXPR01MB4691AB59B8CFBE3521B8002EA1489@YQXPR01MB4691.CANPRD01.PROD.OUTLOOK.COM> References: <YQXPR01MB4691AB59B8CFBE3521B8002EA1489@YQXPR01MB4691.CANPRD01.PROD.OUTLOOK.COM>
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> On 21. Apr 2021, at 00:02, Dmitry Skorodumov via freebsd-arm = <freebsd-arm@freebsd.org> wrote: >=20 > Hi >=20 >=20 > It looks like code for gic-v2 in FreeBSD not quite correctly relies on = implementation defined behaviour of GIC. >=20 > The = g<file:///Users/sdmitry/Downloads/IHI0048B_b_gic_architecture_specificatio= n.pdf>ic 2.0 spec https://developer.arm.com/documentation/ihi0048/bb = chapter 3.2.2 "Interrupt controls in the GIC" states the following: >=20 > "Whether SGIs are permanently enabled, or can be enabled and disabled = by writes to the GICD_ISENABLERn and GICD_ICENABLERn, is IMPLEMENTATION = DEFINED." >=20 > But code in sys/arm/arm/gic.c assumes that SGI are always enabled and = doesn't configure them at initialization. They are initialized only for = secondary CPUs - in arm_gic_init_secondary(). >=20 > For sure it is a rather minor issue, since all appears to be ok in = gic-v3 (v3 code enables SGIs for all CPUs, including the boot one). And = even if platform supports only gic-v2, likely SGIs are always enabled = anyway. So, my post is rather pedantic notice without real life case. Dear all, if I understand things correctly, the problem described is the cause = which does not allow to use more than one CPU core in FreeBSD when running on Parallels = Desktop on an M1 based Mac. It runs perfectly well with one core, but with multiple = cores it locks up during boot. It would be great if some could propose a patch. I would be more than = happy to test it. Best regards Michael >=20 > Dmitry > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"
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