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<86h6ypol03.wl-maz@kernel.org> From: Marc Zyngier To: Icenowy Zheng Cc: Thomas Gleixner , Palmer Dabbelt , Paul Walmsley , Samuel Holland , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH] irqchip/sifive-plic: drop quirk for two-cell variant In-Reply-To: <402eb920c5ca84e7d751ec7bd9b7f4f512a66921.camel@icenowy.me> References: <20221121042026.419383-1-uwu@icenowy.me> <86o7syoq4t.wl-maz@kernel.org> <16d01eebc1693916fc74e1e75458d6c0f080cf37.camel@icenowy.me> <86ilj5oltb.wl-maz@kernel.org> <402eb920c5ca84e7d751ec7bd9b7f4f512a66921.camel@icenowy.me> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: uwu@icenowy.me, tglx@linutronix.de, palmer@dabbelt.com, paul.walmsley@sifive.com, samuel@sholland.org, 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In-Reply-To: <402eb920c5ca84e7d751ec7bd9b7f4f512a66921.camel@icenowy.me> References: <20221121042026.419383-1-uwu@icenowy.me> <86o7syoq4t.wl-maz@kernel.org> <16d01eebc1693916fc74e1e75458d6c0f080cf37.camel@icenowy.me> <86ilj5oltb.wl-maz@kernel.org> <402eb920c5ca84e7d751ec7bd9b7f4f512a66921.camel@icenowy.me> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: uwu@icenowy.me, tglx@linutronix.de, palmer@dabbelt.com, paul.walmsley@sifive.com, samuel@sholland.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 23 Nov 2022 13:16:01 +0000, Icenowy Zheng wrote: >=20 > =E5=9C=A8 2022-11-23=E6=98=9F=E6=9C=9F=E4=B8=89=E7=9A=84 13:13 +0000=EF= =BC=8CMarc Zyngier=E5=86=99=E9=81=93=EF=BC=9A > > On Wed, 23 Nov 2022 12:38:56 +0000, > > Icenowy Zheng wrote: > > >=20 > > > =E5=9C=A8 2022-11-22=E6=98=9F=E6=9C=9F=E4=BA=8C=E7=9A=84 17:28 +0000= =EF=BC=8CMarc Zyngier=E5=86=99=E9=81=93=EF=BC=9A > > > > On Mon, 21 Nov 2022 04:20:26 +0000, > > > > Icenowy Zheng wrote: > > > > >=20 > > > > > As the special handling of edge-triggered interrupts are > > > > > defined in > > > > > the > > > > > PLIC spec, we can assume it's not a quirk, but a feature of the > > > > > PLIC > > > > > spec; thus making it a quirk and use quirk-based codepath is > > > > > not so > > > > > necessary. > > > >=20 > > > > It *is* necessary. > > > >=20 > > > > >=20 > > > > > Move to a #interrupt-cells-based practice which will allow both > > > > > device > > > > > trees without interrupt flags and with interrupt flags work for > > > > > all > > > > > compatible strings. > > > >=20 > > > > No. You're tying together two unrelated concepts: > > > >=20 > > > > - Edges get dropped in some implementations (and only some). You > > > > can > > > > =C2=A0 argue that the architecture allows it, but I see it is an > > > > =C2=A0 implementation bug. > > >=20 > > > As the specification allows it, it's not an implementation bug -- > > > and > > > for those which do not show this problem, it's possible that it's > > > just > > > all using the same trigger type (e.g. Rocket). > >=20 > > What are you against? The fact that this is flagged as a quirk? > > Honestly, I don't care about that. If we can fold all implementations > > into the same scheme, that's fine by me. >=20 > Then what should I do? Make all edge-triggered interrupts use the edge flow. >=20 > >=20 > > >=20 > > > >=20 > > > > - The need for expressing additional information in the interrupt > > > > =C2=A0 specifier is not necessarily related to the above. Other > > > > interrupt > > > > =C2=A0 controllers use extra cells to encode the interrupt affinity, > > > > for > > > > =C2=A0 example. > > >=20 > > > I think in these situations, if the interrupt controller does not > > > contain any special handling for edge interrupts, we can just > > > describe > > > them as level ones in SW. > >=20 > > No, that's utterly wrong. We don't describe an edge as level. Ever. > >=20 > > >=20 > > > >=20 > > > > I want these two things to be kept separate. Otherwise, once we > > > > get > > > > some fancy ACPI support for RISCV (no, please...), we'll have to > > > > redo > > > > the whole thing... > > > >=20 > > > > > In addition, this addresses a stable version DT binding > > > > > violation - > > > > > - > > > > > Linux v5.19 comes with "thead,c900-plic" with #interrupt-cells > > > > > defined to > > > > > be 1 instead of 2, this commit will allow DTs that complies to > > > > > Linux > > > > > v5.19 binding work (although no such DT is devliered to the > > > > > public > > > > > now). > > > >=20 > > > > *That* is what should get fixed. > > >=20 > > > Supporting all stable versions' DT binding is our promise, I think. > >=20 > > Absolutely. And I'm asking you to fix it. And only that. >=20 > Then what should I do? Mask this as another quirk that is only > applicable to c900-plic? No. Make interrupts with a single cell use the level flow. > Sounds more crazy... There is obviously no accounting for taste. M. --=20 Without deviation from the norm, progress is not possible.