From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.free-electrons.com ([94.23.35.102]:41089 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753237Ab3GANmk (ORCPT ); Mon, 1 Jul 2013 09:42:40 -0400 From: Thomas Petazzoni To: Bjorn Helgaas , linux-pci@vger.kernel.org, Russell King , Grant Likely , Rob Herring , Thomas Gleixner , Jason Cooper , Andrew Lunn , Gregory Clement Cc: Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, Maen Suleiman , Lior Amsalem , Thierry Reding Subject: [PATCHv4 01/11] irqdomain: add irq_alloc_mapping() function Date: Mon, 1 Jul 2013 15:42:06 +0200 Message-Id: <1372686136-1370-2-git-send-email-thomas.petazzoni@free-electrons.com> In-Reply-To: <1372686136-1370-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1372686136-1370-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: linux-pci-owner@vger.kernel.org List-ID: This commit extends the irqdomain subsystem with an irq_alloc_mapping() function which allows to let the irqdomain code find an available hwirq number in the range [ 0 ; domain size ] for the given domain, and create a virq mapping for it. Signed-off-by: Thomas Petazzoni --- include/linux/irqdomain.h | 2 ++ kernel/irq/irqdomain.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 02f7658..5f9c3ff 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -195,6 +195,8 @@ static inline unsigned int irq_linear_revmap(struct irq_domain *domain, extern unsigned int irq_find_mapping(struct irq_domain *host, irq_hw_number_t hwirq); extern unsigned int irq_create_direct_mapping(struct irq_domain *host); +extern unsigned int irq_alloc_mapping(struct irq_domain *host, + irq_hw_number_t *hwirq); extern int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, irq_hw_number_t hwirq_base, int count); diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 836a0f7..be82d2e 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -375,6 +375,38 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) EXPORT_SYMBOL_GPL(irq_create_direct_mapping); /** + * irq_alloc_mapping() - Allocate an irq for mapping + * @domain: domain to allocate the irq for or NULL for default domain + * @hwirq: reference to the returned hwirq + * + * This routine are used for irq controllers which can choose the + * hardware interrupt number from a range [ 0 ; domain size ], such as + * is often the case with PCI MSI controllers. The function will + * returned the allocated hwirq number in the hwirq pointer, and the + * corresponding virq number as the return value. + */ +unsigned int irq_alloc_mapping(struct irq_domain *domain, + irq_hw_number_t *out_hwirq) +{ + irq_hw_number_t hwirq; + + pr_debug("irq_alloc_mapping(0x%p)\n", domain); + + for (hwirq = 0; hwirq < domain->hwirq_max; hwirq++) + if (!irq_find_mapping(domain, hwirq)) + break; + + if (hwirq == domain->hwirq_max) { + pr_debug("-> no available hwirq found\n"); + return 0; + } + + *out_hwirq = hwirq; + return irq_create_mapping(domain, hwirq); +} +EXPORT_SYMBOL_GPL(irq_alloc_mapping); + +/** * irq_create_mapping() - Map a hardware interrupt into linux irq space * @domain: domain owning this hardware interrupt or NULL for default domain * @hwirq: hardware irq number in that domain space -- 1.8.1.2