Date: Tue, 18 Mar 2014 07:32:26 -0600 From: Ian Lepore <ian@FreeBSD.org> To: Wojciech Macek <wma@semihalf.com> Cc: freebsd-arm@FreeBSD.org Subject: Re: arm SMP on Cortex-A15 Message-ID: <1395149546.1149.589.camel@revolution.hippie.lan> In-Reply-To: <CANsEV8fWvUkFHi8DP6Nr807RwPDB1iZrO39fpfa44qOkJPidZA@mail.gmail.com> References: <CANsEV8euHTsfviiCMP_aet3qYiK2T-oK%2B-37eay7zAPH2S2vaA@mail.gmail.com> <20131220125638.GA5132@mail.bsdpad.com> <20131222092913.GA89153@mail.bsdpad.com> <CANsEV8fSoygoSUyQqKoEQ7tRxjqDOwrPD8dU7O2V2PXRj35j4A@mail.gmail.com> <20131222123636.GA61193@ci0.org> <CANsEV8fWvUkFHi8DP6Nr807RwPDB1iZrO39fpfa44qOkJPidZA@mail.gmail.com>
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On Mon, 2014-03-17 at 09:29 +0100, Wojciech Macek wrote: > Hi, > > Finally I've found some time to continue SMP hacking. It seems that I > isolated the tlb/pmam failures and developed two simple patches that help. > There are still some pmap changes and TEX remap left, but I don't want to > use them now. > https://drive.google.com/folderview?id=0B-7yTLrPxaWtSzZPUGgtM3pnUjg&usp=sharing > * 01 - ensure that TTB is set before TLB invalidation and flush BTB to > comply the specs > * 02 - add missing TLB invalidations to pmap and fix invalidation order > > I chose buildworld -j4 as a stresstest, and run it on Arndale (USB rootfs) > and a different 4-core a15 chip (SATA rootfs). On both setups test passed > and was significantly faster than the one with previous patchset. > > I'd like to submit these changes to FreeBSD tree (with some help from our > local committers), so any comments and testing are really appreciated. > > Best regards, > Wojtek BTW, on line 1561 of pmap-v6.c there's an #ifdef DEBUG. If you change that to #if 1 you'll find that sometimes the problem that code is looking for happens: fixup: pmap 0xc72c10bc, va 0x203f7000, ftype 1 - nothing to do! fixup: l2 0xc781e0c4, l2b 0xc781e0ec, ptep 0xc76c83dc, pl1pd 0xe1ce680c fixup: pte 0x11a2c67e, l1pd 0x670c8021, last code 0x0 I just noticed this last night and haven't dug into it yet. I'm running on a quad-core cortex-a9 (imx6), BTW. -- Ian
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