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Wed, 16 Sep 2020 16:10:57 +0100 MIME-Version: 1.0 Date: Wed, 16 Sep 2020 16:10:57 +0100 From: Marc Zyngier To: Jon Hunter Subject: Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard interrupts In-Reply-To: <933bc43e-3cd7-10ec-b9ec-58afaa619fb7@nvidia.com> References: <20200901144324.1071694-1-maz@kernel.org> <20200901144324.1071694-9-maz@kernel.org> <933bc43e-3cd7-10ec-b9ec-58afaa619fb7@nvidia.com> User-Agent: Roundcube Webmail/1.4.8 Message-ID: <3378cd07b92e87a24f1db75f708424ee@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: jonathanh@nvidia.com, m.szyprowski@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, sumit.garg@linaro.org, kernel-team@android.com, f.fainelli@gmail.com, linux@arm.linux.org.uk, jason@lakedaemon.net, saravanak@google.com, andrew@lunn.ch, catalin.marinas@arm.com, gregory.clement@bootlin.com, b.zolnierkie@samsung.com, krzk@kernel.org, linux-samsung-soc@vger.kernel.org, tglx@linutronix.de, will@kernel.org, Valentin.Schneider@arm.com, linux-tegra@vger.kernel.org, linus.walleij@linaro.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-20200916_111100_523395_80C25BA2 X-CRM114-Status: GOOD ( 23.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sumit Garg , linus.walleij@linaro.org, Florian Fainelli , Russell King , Jason Cooper , Saravana Kannan , Andrew Lunn , Catalin Marinas , Gregory Clement , Bartlomiej Zolnierkiewicz , linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Will Deacon , 'Linux Samsung SOC' , linux-tegra , Thomas Gleixner , kernel-team@android.com, Valentin Schneider , linux-arm-kernel@lists.infradead.org, Marek Szyprowski Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Jon, +Linus, who is facing a similar issue. On 2020-09-16 15:16, Jon Hunter wrote: > Hi Marc, > > On 14/09/2020 14:06, Marek Szyprowski wrote: >> Hi Marc, >> >> On 01.09.2020 16:43, Marc Zyngier wrote: >>> Change the way we deal with GIC SGIs by turning them into proper >>> IRQs, and calling into the arch code to register the interrupt range >>> instead of a callback. >>> >>> Reviewed-by: Valentin Schneider >>> Signed-off-by: Marc Zyngier >> This patch landed in linux next-20200914 as commit ac063232d4b0 >> ("irqchip/gic: Configure SGIs as standard interrupts"). Sadly it >> breaks >> booting of all Samsung Exynos 4210/4412 based boards (dual/quad ARM >> Cortex A9 based). Here are the last lines from the bootlog: > > I am observing the same thing on several Tegra boards (both arm and > arm64). Bisect is pointing to this commit. Reverting this alone does > not > appear to be enough to fix the issue. Right, I am just massively by the GICv3 spec, and failed to remember that ye olde GIC exposes the source CPU in AIR *and* wants it back, while newer GICs deal with that transparently. Can you try the patch below and let me know? M. diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index 98743afdaea6..56492bf8b6f9 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -121,9 +121,10 @@ static struct gic_chip_data gic_data[CONFIG_ARM_GIC_MAX_NR] __read_mostly; static struct gic_kvm_info gic_v2_kvm_info; +static DEFINE_PER_CPU(u32, sgi_intid); + #ifdef CONFIG_GIC_NON_BANKED static DEFINE_STATIC_KEY_FALSE(frankengic_key); -static DEFINE_PER_CPU(u32, sgi_intid); static void enable_frankengic(void) { @@ -135,16 +136,6 @@ static inline bool is_frankengic(void) return static_branch_unlikely(&frankengic_key); } -static inline void set_sgi_intid(u32 intid) -{ - this_cpu_write(sgi_intid, intid); -} - -static inline u32 get_sgi_intid(void) -{ - return this_cpu_read(sgi_intid); -} - static inline void __iomem *__get_base(union gic_base *base) { if (is_frankengic()) @@ -160,8 +151,6 @@ static inline void __iomem *__get_base(union gic_base *base) #define gic_data_cpu_base(d) ((d)->cpu_base.common_base) #define enable_frankengic() do { } while(0) #define is_frankengic() false -#define set_sgi_intid(i) do { } while(0) -#define get_sgi_intid() 0 #endif static inline void __iomem *gic_dist_base(struct irq_data *d) @@ -236,8 +225,8 @@ static void gic_eoi_irq(struct irq_data *d) { u32 hwirq = gic_irq(d); - if (is_frankengic() && hwirq < 16) - hwirq = get_sgi_intid(); + if (hwirq < 16) + hwirq = this_cpu_read(sgi_intid); writel_relaxed(hwirq, gic_cpu_base(d) + GIC_CPU_EOI); } @@ -365,14 +354,13 @@ static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) smp_rmb(); /* - * Samsung's funky GIC encodes the source CPU in - * GICC_IAR, leading to the deactivation to fail if - * not written back as is to GICC_EOI. Stash the - * INTID away for gic_eoi_irq() to write back. - * This only works because we don't nest SGIs... + * The GIC encodes the source CPU in GICC_IAR, + * leading to the deactivation to fail if not + * written back as is to GICC_EOI. Stash the INTID + * away for gic_eoi_irq() to write back. This only + * works because we don't nest SGIs... */ - if (is_frankengic()) - set_sgi_intid(irqstat); + this_cpu_write(sgi_intid, intid); } handle_domain_irq(gic->domain, irqnr, regs); -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel