From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B589C04EB8 for ; Mon, 10 Dec 2018 10:55:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2291420989 for ; Mon, 10 Dec 2018 10:55:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2291420989 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727225AbeLJKzW (ORCPT ); Mon, 10 Dec 2018 05:55:22 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:51182 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726614AbeLJKzV (ORCPT ); Mon, 10 Dec 2018 05:55:21 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 150561596; Mon, 10 Dec 2018 02:55:21 -0800 (PST) Received: from [10.1.196.62] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EBE423F6A8; Mon, 10 Dec 2018 02:55:17 -0800 (PST) Subject: Re: [PATCH v4 2/4] irqchip/gic: common: add support to device tree based quirks To: Srinivas Kandagatla Cc: sudeep.holla@arm.com, tglx@linutronix.de, jason@lakedaemon.net, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, rnayak@codeaurora.org, sboyd@kernel.org, bjorn.andersson@linaro.org, nicolas.dechesne@linaro.org, ctatlor97@gmail.com, vkoul@kernel.org, robh+dt@kernel.org, devicetree@vger.kernel.org References: <20181210102309.8207-1-srinivas.kandagatla@linaro.org> <20181210102309.8207-3-srinivas.kandagatla@linaro.org> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20181210102309.8207-3-srinivas.kandagatla@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/12/2018 10:23, Srinivas Kandagatla wrote: > This patch adds support to device tree based quirks based on > device tree compatible string. > > Signed-off-by: Srinivas Kandagatla > --- > drivers/irqchip/irq-gic-common.c | 12 ++++++++++++ > drivers/irqchip/irq-gic-common.h | 3 +++ > drivers/irqchip/irq-gic-v3.c | 5 +++++ > 3 files changed, 20 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c > index 01e673c680cd..3c93c6f4d1f1 100644 > --- a/drivers/irqchip/irq-gic-common.c > +++ b/drivers/irqchip/irq-gic-common.c > @@ -36,6 +36,18 @@ void gic_set_kvm_info(const struct gic_kvm_info *info) > gic_kvm_info = info; > } > > +void gic_enable_of_quirks(const struct device_node *np, > + const struct gic_quirk *quirks, void *data) > +{ > + for (; quirks->desc; quirks++) { So you expect quirks->desc to be NULL at some point, just like for any other quirk table we have. > + if (!of_device_is_compatible(np, quirks->compatible)) > + continue; > + if (quirks->init(data)) > + pr_info("GIC: enabling workaround for %s\n", > + quirks->desc); > + } > +} > + > void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks, > void *data) > { > diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h > index 3919cd7c5285..97e58fb6c232 100644 > --- a/drivers/irqchip/irq-gic-common.h > +++ b/drivers/irqchip/irq-gic-common.h > @@ -23,6 +23,7 @@ > > struct gic_quirk { > const char *desc; > + const char *compatible; > bool (*init)(void *data); > u32 iidr; > u32 mask; > @@ -35,6 +36,8 @@ void gic_dist_config(void __iomem *base, int gic_irqs, > void gic_cpu_config(void __iomem *base, void (*sync_access)(void)); > void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks, > void *data); > +void gic_enable_of_quirks(const struct device_node *np, > + const struct gic_quirk *quirks, void *data); > > void gic_set_kvm_info(const struct gic_kvm_info *info); > > diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c > index 29e9d47be97d..c95796fa4de6 100644 > --- a/drivers/irqchip/irq-gic-v3.c > +++ b/drivers/irqchip/irq-gic-v3.c > @@ -1271,6 +1271,9 @@ static void __init gic_of_setup_kvm_info(struct device_node *node) > gic_set_kvm_info(&gic_v3_kvm_info); > } > > +static const struct gic_quirk gic_quirks[] = { > +}; ... and yet here you provide an empty table. That's not going to work very well. You definitely need to have an empty entry at the end of the array, always. I guess you want to test your code on a non affected platform, and I'm pretty sure you'll see it exploding. > + > static int __init gic_of_init(struct device_node *node, struct device_node *parent) > { > void __iomem *dist_base; > @@ -1318,6 +1321,8 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare > if (of_property_read_u64(node, "redistributor-stride", &redist_stride)) > redist_stride = 0; > > + gic_enable_of_quirks(node, gic_quirks, &gic_data); > + > err = gic_init_bases(dist_base, rdist_regs, nr_redist_regions, > redist_stride, &node->fwnode); > if (err) > Thanks, M. -- Jazz is not dead. It just smells funny...