From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH v2 01/52] genirq: Let irq_set_vcpu_affinity() iterate over hierarchy Date: Wed, 28 Jun 2017 16:03:20 +0100 Message-ID: <20170628150411.15846-2-marc.zyngier@arm.com> References: <20170628150411.15846-1-marc.zyngier@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 27BC440D44 for ; Wed, 28 Jun 2017 11:04:31 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PrZlhBM+Wp7Z for ; Wed, 28 Jun 2017 11:04:30 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1986740187 for ; Wed, 28 Jun 2017 11:04:30 -0400 (EDT) In-Reply-To: <20170628150411.15846-1-marc.zyngier@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Cc: Jason Cooper , Thomas Gleixner List-Id: kvmarm@lists.cs.columbia.edu When assigning an interrupt to a vcpu, it is not unlikely that the level of the hierarchy implementing irq_set_vcpu_affinity is not the top level (think a generic MSI domain on top of a virtualization aware interrupt controller). In such a case, let's iterate over the hierarchy until we find an irqchip implementing it. Signed-off-by: Marc Zyngier --- kernel/irq/manage.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 425170d4439b..804fb94e86e6 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -431,8 +431,18 @@ int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info) return -EINVAL; data = irq_desc_get_irq_data(desc); - chip = irq_data_get_irq_chip(data); - if (chip && chip->irq_set_vcpu_affinity) + do { + chip = irq_data_get_irq_chip(data); + if (chip && chip->irq_set_vcpu_affinity) + break; +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + data = data->parent_data; +#else + data = NULL; +#endif + } while (data); + + if (data) ret = chip->irq_set_vcpu_affinity(data, vcpu_info); irq_put_desc_unlock(desc, flags); -- 2.11.0