From patchwork Wed May 4 15:18:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9015971 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 09FFB9F39D for ; Wed, 4 May 2016 15:21:33 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 23B41203AB for ; Wed, 4 May 2016 15:21:32 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BE1DC20397 for ; Wed, 4 May 2016 15:21:30 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1axyaT-0000gk-LR; Wed, 04 May 2016 15:19:41 +0000 Received: from mail-wm0-x236.google.com ([2a00:1450:400c:c09::236]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1axyZm-0000Av-43 for linux-arm-kernel@lists.infradead.org; Wed, 04 May 2016 15:18:58 +0000 Received: by mail-wm0-x236.google.com with SMTP id a17so100415520wme.0 for ; Wed, 04 May 2016 08:18:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=edB2ueHYk86ihVLzInqR27TmUGDBgIiaKI78vG0GvJM=; b=iHO/IYXQuSJMf5v6nqhoAscq8CfHdHyUt3ijteCMTKciUdTF45WP2RP/Yv5BLzySga OBoAhpEVv3ry8/1kdvp2z8059ZOkxA95IaT1zGF1NV+w5d4TbxU3fVPWuSo59pbLUoyL ShvZ5y0bqdIBuWfiqoaD5OdYajDh7uLuL/Ajc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=edB2ueHYk86ihVLzInqR27TmUGDBgIiaKI78vG0GvJM=; b=fUf0zLuQrBQxKGelvnLA/bLbji5waI6jCCkTWrHNm061A3Y95RmTRfWKhQdlHdTfz+ Fu4mJ3l5CFj9RBJAlgAUlbfZKNCK7t0gFWVGCMLA+CsjWxCMMhgSIuyxWvu66jqQhsuy yuWQ3D/QI8HZ59qzlgiNQpGysHhlIcLjFm45NqAYkoQTDg6jSm5CukYUVla0vf8LAGJn 6775643H9+lssKfmXIfAPulE9ypqOSiT9G26eIQW4WP5JbywO4D5FCp33qeKH//hnB+b dV/8gd7yIHXIYoppx24qS1ZwjYJsKR9eQz88IsH/Ho+cy5gSbhBaFqK0Yfsh1bibCxLL dIuQ== X-Gm-Message-State: AOPr4FXK7MRQMSMlbDtaPvcijwiFLwLi7CQOU47ylrWxqT/elLvIuab47mT7VTcRT7jm1wno X-Received: by 10.194.171.194 with SMTP id aw2mr10473975wjc.113.1462375115163; Wed, 04 May 2016 08:18:35 -0700 (PDT) Received: from new-host-57.home (LMontsouris-657-1-37-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by smtp.gmail.com with ESMTPSA id c4sm4773821wjm.24.2016.05.04.08.18.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 04 May 2016 08:18:33 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v9 5/8] genirq/irq: introduce msi_doorbell_info Date: Wed, 4 May 2016 15:18:11 +0000 Message-Id: <1462375094-2390-6-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1462375094-2390-1-git-send-email-eric.auger@linaro.org> References: <1462375094-2390-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160504_081858_329024_52931A8C X-CRM114-Status: GOOD ( 14.75 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: julien.grall@arm.com, patches@linaro.org, Jean-Philippe.Brucker@arm.com, p.fedin@samsung.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, yehuday@marvell.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-6.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The purpose is to be able to retrieve the MSI doorbells of an irqchip. This is now needed since on some platforms those doorbells must be iommu mapped (in case the MSIs transit through an IOMMU that do not bypass those transactions). The assumption is there is a maximum of one doorbell region per cpu. Sometimes a single doorbell is supported, hence the union. A doorbell region is characterized by its physical address base, size and IOMMU protection flag. Those 2 last characteristics are shared among all doorbells. irq_chip msi_doorbell_info callback enables to retrieve the doorbells of the irqchip. Signed-off-by: Eric Auger --- v8 -> v9: - use a union and doorbell_is_percpu boolean v7 -> v8: - size and prot now are shared among all doorbells - doorbells now directly points to a percpu phys_addr_t v7: creation --- include/linux/irq.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index c4de623..4b4e479 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -312,6 +312,17 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) return d->hwirq; } +/* Describe all the MSI doorbell regions for an irqchip */ +struct irq_chip_msi_doorbell_info { + union { + phys_addr_t __percpu *percpu_doorbells; + phys_addr_t global_doorbell; + }; + bool doorbell_is_percpu; + size_t size; /* size of a each doorbell */ + int prot; /* iommu protection flag */ +}; + /** * struct irq_chip - hardware interrupt chip descriptor * @@ -349,6 +360,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) * @irq_get_irqchip_state: return the internal state of an interrupt * @irq_set_irqchip_state: set the internal state of a interrupt * @irq_set_vcpu_affinity: optional to target a vCPU in a virtual machine + * @msi_doorbell_info: return the MSI doorbell info * @ipi_send_single: send a single IPI to destination cpus * @ipi_send_mask: send an IPI to destination cpus in cpumask * @flags: chip specific flags @@ -394,7 +406,8 @@ struct irq_chip { int (*irq_set_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool state); int (*irq_set_vcpu_affinity)(struct irq_data *data, void *vcpu_info); - + struct irq_chip_msi_doorbell_info *(*msi_doorbell_info)( + struct irq_data *data); void (*ipi_send_single)(struct irq_data *data, unsigned int cpu); void (*ipi_send_mask)(struct irq_data *data, const struct cpumask *dest);