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[23.128.96.18]) by mx.google.com with ESMTP id a14si5927301ejv.483.2020.07.02.10.45.16; Thu, 02 Jul 2020 10:45:40 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=Ch3hykzf; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727891AbgGBRod (ORCPT + 99 others); Thu, 2 Jul 2020 13:44:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:47682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726754AbgGBRoc (ORCPT ); Thu, 2 Jul 2020 13:44:32 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 855D22084C; Thu, 2 Jul 2020 17:44:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593711871; bh=jvU81eMf9nFGcLoqw6ryzx8Tg8Jkc1RCkdQ6/wLR6e0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Ch3hykzfMgu1Qo8zt4VSYuTyusuv1Lqco8D+TwHw9WyRPNntv3XRMHGrgYHe7LgO1 h173wZqkhm+wT8g/yJ+sa7y5wZTDvbsJfStZVxSbP03BEvY2w3baybXDXQJtvEHPI8 5z2C0OxIRiAW6fH0Klx1fRsUZYaRU7lglUYFLdeQ= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1jr3GA-008V3N-21; Thu, 02 Jul 2020 18:44:30 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 02 Jul 2020 18:44:30 +0100 From: Marc Zyngier To: Grzegorz Jaszczyk Cc: tglx@linutronix.de, jason@lakedaemon.net, s-anna@ti.com, robh+dt@kernel.org, lee.jones@linaro.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, david@lechnology.com, wmills@ti.com Subject: Re: [PATCHv3 3/6] irqchip/irq-pruss-intc: Add support for shared and invalid interrupts In-Reply-To: <1593699479-1445-4-git-send-email-grzegorz.jaszczyk@linaro.org> References: <1593699479-1445-1-git-send-email-grzegorz.jaszczyk@linaro.org> <1593699479-1445-4-git-send-email-grzegorz.jaszczyk@linaro.org> User-Agent: Roundcube Webmail/1.4.5 Message-ID: <2a6b0391f1395eb0aa15ffee6769184e@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: grzegorz.jaszczyk@linaro.org, tglx@linutronix.de, jason@lakedaemon.net, s-anna@ti.com, robh+dt@kernel.org, lee.jones@linaro.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, david@lechnology.com, wmills@ti.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-07-02 15:17, Grzegorz Jaszczyk wrote: > From: Suman Anna > > The PRUSS INTC has a fixed number of output interrupt lines that are > connected to a number of processors or other PRUSS instances or other > devices (like DMA) on the SoC. The output interrupt lines 2 through 9 > are usually connected to the main Arm host processor and are referred > to as host interrupts 0 through 7 from ARM/MPU perspective. > > All of these 8 host interrupts are not always exclusively connected > to the Arm interrupt controller. Some SoCs have some interrupt lines > not connected to the Arm interrupt controller at all, while a few > others > have the interrupt lines connected to multiple processors in which they > need to be partitioned as per SoC integration needs. For example, > AM437x > and 66AK2G SoCs have 2 PRUSS instances each and have the host interrupt > 5 > connected to the other PRUSS, while AM335x has host interrupt 0 shared > between MPU and TSC_ADC and host interrupts 6 & 7 shared between MPU > and > a DMA controller. > > Add support to the PRUSS INTC driver to allow both these shared and > invalid interrupts by not returning a failure if any of these > interrupts > are skipped from the corresponding INTC DT node. That's not exactly "adding support", is it? It really is "ignore these interrupts because they are useless from the main CPU's perspective", right? > > Signed-off-by: Suman Anna > Signed-off-by: Grzegorz Jaszczyk > --- > v2->v3: > - Extra checks for (intc->irqs[i]) in error/remove path was moved from > "irqchip/irq-pruss-intc: Add a PRUSS irqchip driver for PRUSS > interrupts" to this patch > v1->v2: > - https://patchwork.kernel.org/patch/11069757/ > --- > drivers/irqchip/irq-pruss-intc.c | 73 > +++++++++++++++++++++++++++++++++++++--- > 1 file changed, 68 insertions(+), 5 deletions(-) > > diff --git a/drivers/irqchip/irq-pruss-intc.c > b/drivers/irqchip/irq-pruss-intc.c > index fb3dda3..49c936f 100644 > --- a/drivers/irqchip/irq-pruss-intc.c > +++ b/drivers/irqchip/irq-pruss-intc.c > @@ -65,11 +65,15 @@ > * @irqs: kernel irq numbers corresponding to PRUSS host interrupts > * @base: base virtual address of INTC register space > * @domain: irq domain for this interrupt controller > + * @shared_intr: bit-map denoting if the MPU host interrupt is shared nit: bitmap > + * @invalid_intr: bit-map denoting if host interrupt is not connected > to MPU > */ > struct pruss_intc { > unsigned int irqs[MAX_NUM_HOST_IRQS]; > void __iomem *base; > struct irq_domain *domain; > + u16 shared_intr; > + u16 invalid_intr; Please represent bitmaps as an unsigned long. > }; > > static inline u32 pruss_intc_read_reg(struct pruss_intc *intc, > unsigned int reg) > @@ -222,7 +226,8 @@ static int pruss_intc_probe(struct platform_device > *pdev) > "host_intr4", "host_intr5", "host_intr6", "host_intr7", }; > struct device *dev = &pdev->dev; > struct pruss_intc *intc; > - int i, irq; > + int i, irq, count; > + u8 temp_intr[MAX_NUM_HOST_IRQS] = { 0 }; > > intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL); > if (!intc) > @@ -235,6 +240,52 @@ static int pruss_intc_probe(struct platform_device > *pdev) > return PTR_ERR(intc->base); > } > > + count = of_property_read_variable_u8_array(dev->of_node, > + "ti,irqs-reserved", > + temp_intr, 0, > + MAX_NUM_HOST_IRQS); > + /* > + * The irqs-reserved is used only for some SoC's therefore not having > + * this property is still valid > + */ > + if (count == -EINVAL) > + count = 0; > + if (count < 0) > + return count; > + > + for (i = 0; i < count; i++) { > + if (temp_intr[i] >= MAX_NUM_HOST_IRQS) { > + dev_warn(dev, "ignoring invalid reserved irq %d\n", > + temp_intr[i]); > + continue; > + } > + > + intc->invalid_intr |= BIT(temp_intr[i]); > + } > + > + count = of_property_read_variable_u8_array(dev->of_node, > + "ti,irqs-shared", > + temp_intr, 0, > + MAX_NUM_HOST_IRQS); > + /* > + * The irqs-shared is used only for some SoC's therefore not having > + * this property is still valid > + */ > + if (count == -EINVAL) > + count = 0; > + if (count < 0) > + return count; > + > + for (i = 0; i < count; i++) { > + if (temp_intr[i] >= MAX_NUM_HOST_IRQS) { > + dev_warn(dev, "ignoring invalid shared irq %d\n", > + temp_intr[i]); > + continue; > + } > + > + intc->shared_intr |= BIT(temp_intr[i]); > + } > + You probably want to move this in a separate function, since you populate a common structure. > pruss_intc_init(intc); > > /* always 64 events */ > @@ -244,8 +295,14 @@ static int pruss_intc_probe(struct platform_device > *pdev) > return -ENOMEM; > > for (i = 0; i < MAX_NUM_HOST_IRQS; i++) { > + if (intc->invalid_intr & BIT(i)) > + continue; > + > irq = platform_get_irq_byname(pdev, irq_names[i]); > if (irq <= 0) { > + if (intc->shared_intr & BIT(i)) > + continue; I don't really understand why you are treating these "shared" interrupts differently from the invalid ones. In all cases, they shouldn't be used. > + > dev_err(dev, "platform_get_irq_byname failed for %s : %d\n", > irq_names[i], irq); > goto fail_irq; > @@ -259,8 +316,11 @@ static int pruss_intc_probe(struct platform_device > *pdev) > return 0; > > fail_irq: > - while (--i >= 0) > - irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL); > + while (--i >= 0) { > + if (intc->irqs[i]) > + irq_set_chained_handler_and_data(intc->irqs[i], NULL, > + NULL); > + } > > irq_domain_remove(intc->domain); > > @@ -273,8 +333,11 @@ static int pruss_intc_remove(struct > platform_device *pdev) > unsigned int hwirq; > int i; > > - for (i = 0; i < MAX_NUM_HOST_IRQS; i++) > - irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL); > + for (i = 0; i < MAX_NUM_HOST_IRQS; i++) { > + if (intc->irqs[i]) > + irq_set_chained_handler_and_data(intc->irqs[i], NULL, > + NULL); > + } > > for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++) > irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq)); Thanks, M. -- Jazz is not dead. It just smells funny...