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Tue, 30 May 2023 10:46:37 +0100 Date: Tue, 30 May 2023 10:46:37 +0100 Message-ID: <868rd6cfsy.wl-maz@kernel.org> From: Marc Zyngier To: Geert Uytterhoeven Cc: Douglas Anderson , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Matthias Brugger , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Allen-KH Cheng , linux-mediatek@lists.infradead.org, Eddie Huang , Hsin-Hsiung Wang , AngeloGioacchino Del Regno , wenst@chromium.org, yidilin@chromium.org, Tinghan Shen , jwerner@chromium.org, Weiyi Lu , Ben Ho , Seiya Wang , linux-kernel@vger.kernel.org, Linux-Renesas Subject: Re: [PATCH v2 2/5] irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ firmware issues In-Reply-To: References: <20230515131353.v2.cover@dianders> <20230515131353.v2.2.I88dc0a0eb1d9d537de61604cd8994ecc55c0cac1@changeid> 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/28.2 (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: geert@linux-m68k.org, dianders@chromium.org, tglx@linutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, matthias.bgg@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, allen-kh.cheng@mediatek.com, linux-mediatek@lists.infradead.org, eddie.huang@mediatek.com, hsin-hsiung.wang@mediatek.com, angelogioacchino.delregno@collabora.com, wenst@chromium.org, yidilin@chromium.org, tinghan.shen@mediatek.com, jwerner@chromium.org, weiyi.lu@mediatek.com, Ben.Ho@mediatek.com, seiya.wang@mediatek.com, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230530_024641_705514_B0C4BE15 X-CRM114-Status: GOOD ( 37.38 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Tue, 30 May 2023 09:29:02 +0100, Geert Uytterhoeven wrote: >=20 > Hi Douglas, >=20 > On Mon, May 15, 2023 at 10:16=E2=80=AFPM Douglas Anderson wrote: > > Some Chromebooks with Mediatek SoCs have a problem where the firmware > > doesn't properly save/restore certain GICR registers. Newer > > Chromebooks should fix this issue and we may be able to do firmware > > updates for old Chromebooks. At the moment, the only known issue with > > these Chromebooks is that we can't enable "pseudo NMIs" since the > > priority register can be lost. Enabling "pseudo NMIs" on Chromebooks > > with the problematic firmware causes crashes and freezes. > > > > Let's detect devices with this problem and then disable "pseudo NMIs" > > on them. We'll detect the problem by looking for the presence of the > > "mediatek,broken-save-restore-fw" property in the GIC device tree > > node. Any devices with fixed firmware will not have this property. > > > > Our detection plan works because we never bake a Chromebook's device > > tree into firmware. Instead, device trees are always bundled with the > > kernel. We'll update the device trees of all affected Chromebooks and > > then we'll never enable "pseudo NMI" on a kernel that is bundled with > > old device trees. When a firmware update is shipped that fixes this > > issue it will know to patch the device tree to remove the property. > > > > In order to make this work, the quick detection mechanism of the GICv3 > > code is extended to be able to look for properties in addition to > > looking at "compatible". > > > > Reviewed-by: Julius Werner > > Signed-off-by: Douglas Anderson > > --- > > > > Changes in v2: > > - mediatek,gicr-save-quirk =3D> mediatek,broken-save-restore-fw >=20 > Thanks for your patch, which is now commit 44bd78dd2b8897f5 > ("irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ > firmware issues") in v6.4-rc4. >=20 > This causes enabling an unrelated workaround on R-Car V4H: >=20 > GIC: enabling workaround for GICv3: Cavium erratum 38539 >=20 > > --- a/drivers/irqchip/irq-gic-common.c > > +++ b/drivers/irqchip/irq-gic-common.c > > @@ -16,7 +16,11 @@ void gic_enable_of_quirks(const struct device_node *= np, > > const struct gic_quirk *quirks, void *data) > > { > > for (; quirks->desc; quirks++) { > > - if (!of_device_is_compatible(np, quirks->compatible)) > > + if (quirks->compatible && > > + !of_device_is_compatible(np, quirks->compatible)) > > + continue; > > + if (quirks->property && > > + !of_property_read_bool(np, quirks->property)) > > continue; >=20 > Presumably the loop should continue if none of quirks-compatible > or quirks->property is set? Indeed, thanks for pointing that out. Can you give the following hack a go (compile tested only)? diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-com= mon.c index de47b51cdadb..7b591736ab58 100644 --- a/drivers/irqchip/irq-gic-common.c +++ b/drivers/irqchip/irq-gic-common.c @@ -16,6 +16,8 @@ void gic_enable_of_quirks(const struct device_node *np, const struct gic_quirk *quirks, void *data) { for (; quirks->desc; quirks++) { + if (!quirks->compatible && !quirks->property) + continue; if (quirks->compatible && !of_device_is_compatible(np, quirks->compatible)) continue; If that works for you, I'll queue it ASAP. Cheers, M. --=20 Without deviation from the norm, progress is not possible. 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Uytterhoeven Cc: Douglas Anderson , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Matthias Brugger , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Allen-KH Cheng , linux-mediatek@lists.infradead.org, Eddie Huang , Hsin-Hsiung Wang , AngeloGioacchino Del Regno , wenst@chromium.org, yidilin@chromium.org, Tinghan Shen , jwerner@chromium.org, Weiyi Lu , Ben Ho , Seiya Wang , linux-kernel@vger.kernel.org, Linux-Renesas Subject: Re: [PATCH v2 2/5] irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ firmware issues In-Reply-To: References: <20230515131353.v2.cover@dianders> <20230515131353.v2.2.I88dc0a0eb1d9d537de61604cd8994ecc55c0cac1@changeid> 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/28.2 (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: 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