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=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,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 28DCDC433ED for ; Thu, 20 May 2021 16:59:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05A8E613E2 for ; Thu, 20 May 2021 16:59:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235068AbhETRAa (ORCPT ); Thu, 20 May 2021 13:00:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:57258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237996AbhETQ7Q (ORCPT ); Thu, 20 May 2021 12:59:16 -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 D2AB66139A; Thu, 20 May 2021 16:57:54 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ljlgb-002d7b-NH; Thu, 20 May 2021 17:38:13 +0100 From: Marc Zyngier To: linux-kernel@vger.kernel.org Cc: Thomas Gleixner , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Ley Foon Tan , Chris Zankel , Max Filippov , Vineet Gupta , Thomas Bogendoerfer , Robert Jarzmik , Russell King , Krzysztof Kozlowski , Yoshinori Sato , Rich Felker , Geert Uytterhoeven , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Daniel Vetter , Rob Clark , Linus Walleij , Lee Jones , Lorenzo Pieralisi , Rob Herring , Bjorn Helgaas , Bartosz Golaszewski , kernel-team@android.com Subject: [PATCH 16/39] irqdomain: Make normal and nomap irqdomains exclusive Date: Thu, 20 May 2021 17:37:28 +0100 Message-Id: <20210520163751.27325-17-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210520163751.27325-1-maz@kernel.org> References: <20210520163751.27325-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, tglx@linutronix.de, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, ley.foon.tan@intel.com, chris@zankel.net, jcmvbkbc@gmail.com, vgupta@synopsys.com, tsbogend@alpha.franken.de, robert.jarzmik@free.fr, linux@armlinux.org.uk, krzysztof.kozlowski@canonical.com, ysato@users.sourceforge.jp, dalias@libc.org, geert@linux-m68k.org, alexander.deucher@amd.com, christian.koenig@amd.com, airlied@linux.ie, daniel@ffwll.ch, robdclark@gmail.com, linus.walleij@linaro.org, lee.jones@linaro.org, lorenzo.pieralisi@arm.com, robh@kernel.org, bhelgaas@google.com, bgolaszewski@baylibre.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Direct mappings are completely exclusive of normal mappings, meaning that we can refactor the code slightly so that we can get rid of the revmap_direct_max_irq field and use the revmap_size field instead, reducing the size of the irqdomain structure. Signed-off-by: Marc Zyngier --- include/linux/irqdomain.h | 6 +++--- kernel/irq/irqdomain.c | 45 ++++++++++++++++++++++++++++++--------- 2 files changed, 38 insertions(+), 13 deletions(-) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 723495ec5a2f..0916cf9c6e20 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -149,8 +149,6 @@ struct irq_domain_chip_generic; * @parent: Pointer to parent irq_domain to support hierarchy irq_domains * * Revmap data, used internally by irq_domain - * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that - * support direct mapping * @revmap_size: Size of the linear map table @revmap[] * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map * @revmap: Linear table of hwirq->virq reverse mappings @@ -173,7 +171,6 @@ struct irq_domain { /* reverse map data. The linear map gets appended to the irq_domain */ irq_hw_number_t hwirq_max; - unsigned int revmap_direct_max_irq; unsigned int revmap_size; struct radix_tree_root revmap_tree; struct mutex revmap_tree_mutex; @@ -207,6 +204,9 @@ enum { */ IRQ_DOMAIN_MSI_NOMASK_QUIRK = (1 << 6), + /* Irq domain doesn't translate anything */ + IRQ_DOMAIN_FLAG_NO_MAP = (1 << 7), + /* * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved * for implementation specific purposes and ignored by the diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index e0143e640683..fa94c86e47d4 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -146,6 +146,10 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, static atomic_t unknown_domains; + if (WARN_ON((size && direct_max) || + (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max))) + return NULL; + domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size), GFP_KERNEL, of_node_to_nid(to_of_node(fwnode))); if (!domain) @@ -213,8 +217,14 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, domain->ops = ops; domain->host_data = host_data; domain->hwirq_max = hwirq_max; + + if (direct_max) { + size = direct_max; + domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP; + } + domain->revmap_size = size; - domain->revmap_direct_max_irq = direct_max; + irq_domain_check_hierarchy(domain); mutex_lock(&irq_domain_mutex); @@ -482,9 +492,18 @@ struct irq_domain *irq_get_default_host(void) return irq_default_domain; } +static bool irq_domain_is_nomap(struct irq_domain *domain) +{ + return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && + (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP); +} + static void irq_domain_clear_mapping(struct irq_domain *domain, irq_hw_number_t hwirq) { + if (irq_domain_is_nomap(domain)) + return; + if (hwirq < domain->revmap_size) { domain->revmap[hwirq] = 0; } else { @@ -498,6 +517,9 @@ static void irq_domain_set_mapping(struct irq_domain *domain, irq_hw_number_t hwirq, struct irq_data *irq_data) { + if (irq_domain_is_nomap(domain)) + return; + if (hwirq < domain->revmap_size) { domain->revmap[hwirq] = irq_data->irq; } else { @@ -629,9 +651,9 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) pr_debug("create_direct virq allocation failed\n"); return 0; } - if (virq >= domain->revmap_direct_max_irq) { + if (virq >= domain->revmap_size) { pr_err("ERROR: no free irqs available below %i maximum\n", - domain->revmap_direct_max_irq); + domain->revmap_size); irq_free_desc(virq); return 0; } @@ -879,10 +901,14 @@ unsigned int irq_find_mapping(struct irq_domain *domain, if (domain == NULL) return 0; - if (hwirq < domain->revmap_direct_max_irq) { - data = irq_domain_get_irq_data(domain, hwirq); - if (data && data->hwirq == hwirq) - return hwirq; + if (irq_domain_is_nomap(domain)) { + if (hwirq < domain->revmap_size) { + data = irq_domain_get_irq_data(domain, hwirq); + if (data && data->hwirq == hwirq) + return hwirq; + } + + return 0; } /* Check if the hwirq is in the linear revmap. */ @@ -1470,7 +1496,7 @@ static void irq_domain_fix_revmap(struct irq_data *d) { void __rcu **slot; - if (d->hwirq < d->domain->revmap_size) + if (irq_domain_is_nomap(d->domain) || d->hwirq < d->domain->revmap_size) return; /* Not using radix tree. */ /* Fix up the revmap. */ @@ -1830,8 +1856,7 @@ static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind) { seq_printf(m, "%*sname: %s\n", ind, "", d->name); - seq_printf(m, "%*ssize: %u\n", ind + 1, "", - d->revmap_size + d->revmap_direct_max_irq); + seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size); seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount); seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags); if (d->ops && d->ops->debug_show) -- 2.30.2