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=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 B276FC43381 for ; Thu, 14 Feb 2019 13:43:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76AB4222B6 for ; Thu, 14 Feb 2019 13:43:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.b="B0Nug/r+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436752AbfBNNnC (ORCPT ); Thu, 14 Feb 2019 08:43:02 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:54815 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390507AbfBNNm7 (ORCPT ); Thu, 14 Feb 2019 08:42:59 -0500 Received: by mail-wm1-f67.google.com with SMTP id a62so6341185wmh.4 for ; Thu, 14 Feb 2019 05:42:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=AQxFI5IaDScBSYM2QiGDnhYF78mzPrJfNlrHBt3eAfM=; b=B0Nug/r+Q1ktchEW3T1m9wUXpJgBTvAM02A+j0HJOfNKcIQcHy7eIKmbmKYrcM1vti QOmv7AQG+eP1s9itAN0yk72AFnTT3G2Ye4MMjF3GClwGhckvMMMAMfFhtuW3KdVc1PiZ 9YcCiPBQKmQGbfdFR6UJdtOfeqmI6vCE0SVP8p5gPSElniElLTEpbobcoCI0iBrpmanV ckNWQ+BVvTdD/7pem4Fkzimesrtny/lUeKPdM7iXHAPGUUKN5GpbZxwx8cAmfXxQubE2 +5GtaQDt+88i5a1qS0HAHlxGTmGwH9/DCWsXyqAPjprqF4AhKHbkuzsCpb/rS90sQmLX qMGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=AQxFI5IaDScBSYM2QiGDnhYF78mzPrJfNlrHBt3eAfM=; b=uBr8XnthHhT2UQlSByu3zvXnI1c9SCxfctxEnQoVieOfT99DFmB33vGmtVhz7GDVLi ZZHrrSA/UQfkh0zVd29zyE/3hUHRdkc8SR40Nz8bNAAZp03VH0MW0XgndnBxkqnAtZua 9HdKBueR+c0aUuA7WkqJkW+Ot4oldRUPhcF/Fyo91Ljt4jWbzNCSqnkqRI5GUuBwpTpo Ye7EtUhZP+asBll8zHgOCA3OWpiKeNMsGqK5JIEOJSmjDZ86tdI/IwxUUHOUXaMtB5RZ z5adq2NZ3hX7DSfic8BMbZ0pTKSdo5IrjkOLgevBC/XJMwDiQhcvyllLps2rk7UGaoqR JfCg== X-Gm-Message-State: AHQUAuZ7B4ma8vnxYLZhSsme3JDMutc3vYbOaF05oHtiZleJIcv1+Nss 6yxsMuWu2AvXMNZzxs2tImgtkQ== X-Google-Smtp-Source: AHgI3IYAyCtoery/AKBJuvXqcbmB1685J/TSbgHq6YAUFUMbwGHyYEukArzL7PvcJIRkhV5Hv/bkCg== X-Received: by 2002:a1c:e1c4:: with SMTP id y187mr2916795wmg.50.1550151777005; Thu, 14 Feb 2019 05:42:57 -0800 (PST) Received: from debian-brgl.home ([2a01:cb1d:af:5b00:6d6c:8493:1ab5:dad7]) by smtp.gmail.com with ESMTPSA id 62sm4963460wra.46.2019.02.14.05.42.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Feb 2019 05:42:56 -0800 (PST) From: Bartosz Golaszewski To: Linus Walleij , Thomas Gleixner , Marc Zyngier , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v4 1/7] irq/irq_sim: add a notifier chain Date: Thu, 14 Feb 2019 14:42:26 +0100 Message-Id: <20190214134232.3821-2-brgl@bgdev.pl> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190214134232.3821-1-brgl@bgdev.pl> References: <20190214134232.3821-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski Provide a helper allowing users to register a notifier block with a simulator. For now the only event we're notifying about is a change in type configuration. This is required by the gpio-mockup module which wants to track the state of GPIO lines and simulate rising and falling edge interrupts. Signed-off-by: Bartosz Golaszewski --- include/linux/irq_sim.h | 22 ++++++++++++++++++---- kernel/irq/irq_sim.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 4 deletions(-) diff --git a/include/linux/irq_sim.h b/include/linux/irq_sim.h index 4500d453a63e..e076693d0af7 100644 --- a/include/linux/irq_sim.h +++ b/include/linux/irq_sim.h @@ -8,12 +8,21 @@ #include #include +#include /* * Provides a framework for allocating simulated interrupts which can be * requested like normal irqs and enqueued from process context. */ +#define IRQ_SIM_TYPE_CHANGED 1 + +/* Passed to notifier callbacks when type changes. */ +struct irq_sim_irq_type { + unsigned int offset; + unsigned int type; +}; + struct irq_sim_work_ctx { struct irq_work work; unsigned long *pending; @@ -22,13 +31,16 @@ struct irq_sim_work_ctx { struct irq_sim_irq_ctx { int irqnum; bool enabled; + struct irq_sim *parent; + struct irq_sim_irq_type type; }; struct irq_sim { - struct irq_sim_work_ctx work_ctx; - int irq_base; - unsigned int irq_count; - struct irq_sim_irq_ctx *irqs; + struct irq_sim_work_ctx work_ctx; + int irq_base; + unsigned int irq_count; + struct irq_sim_irq_ctx *irqs; + struct atomic_notifier_head notifier; }; int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs); @@ -37,5 +49,7 @@ int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, void irq_sim_fini(struct irq_sim *sim); void irq_sim_fire(struct irq_sim *sim, unsigned int offset); int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset); +int irq_sim_notifier_register(struct irq_sim *sim, + struct notifier_block *nb); #endif /* _LINUX_IRQ_SIM_H */ diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c index 98a20e1594ce..a55641e78125 100644 --- a/kernel/irq/irq_sim.c +++ b/kernel/irq/irq_sim.c @@ -25,10 +25,34 @@ static void irq_sim_irqunmask(struct irq_data *data) irq_ctx->enabled = true; } +static int irq_sim_set_type(struct irq_data *data, unsigned int type) +{ + struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data); + struct irq_sim *sim = irq_ctx->parent; + int rv; + + /* Only support rising and falling edge types. */ + if (type & ~IRQ_TYPE_EDGE_BOTH) + return -EINVAL; + + irq_ctx->type.type = type; + + rv = atomic_notifier_call_chain(&sim->notifier, + IRQ_SIM_TYPE_CHANGED, + &irq_ctx->type); + if (rv < 0) { + pr_err("%s: error calling the type notifier chain\n", __func__); + return rv; + } + + return 0; +} + static struct irq_chip irq_sim_irqchip = { .name = "irq_sim", .irq_mask = irq_sim_irqmask, .irq_unmask = irq_sim_irqunmask, + .irq_set_type = irq_sim_set_type, }; static void irq_sim_handle_irq(struct irq_work *work) @@ -83,7 +107,9 @@ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) for (i = 0; i < num_irqs; i++) { sim->irqs[i].irqnum = sim->irq_base + i; + sim->irqs[i].parent = sim; sim->irqs[i].enabled = false; + sim->irqs[i].type.offset = i; irq_set_chip(sim->irq_base + i, &irq_sim_irqchip); irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]); irq_set_handler(sim->irq_base + i, &handle_simple_irq); @@ -91,6 +117,7 @@ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); } + ATOMIC_INIT_NOTIFIER_HEAD(&sim->notifier); init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq); sim->irq_count = num_irqs; @@ -180,3 +207,16 @@ int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset) return sim->irqs[offset].irqnum; } EXPORT_SYMBOL_GPL(irq_sim_irqnum); + +/** + * irq_sim_notifier_register - Subscribe for interrupt simulator events. + * + * @sim: The interrupt simulator object. + * @nb: Notifier block. + */ +int irq_sim_notifier_register(struct irq_sim *sim, + struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&sim->notifier, nb); +} +EXPORT_SYMBOL_GPL(irq_sim_notifier_register); -- 2.20.1