Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756143AbbGFN2T (ORCPT ); Mon, 6 Jul 2015 09:28:19 -0400 Received: from mail-wg0-f49.google.com ([74.125.82.49]:34416 "EHLO mail-wg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755838AbbGFNZP (ORCPT ); Mon, 6 Jul 2015 09:25:15 -0400 From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, avi.kivity@gmail.com, mtosatti@redhat.com, feng.wu@intel.com, joro@8bytes.org, b.reynal@virtualopensystems.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, alex.williamson@redhat.com, pbonzini@redhat.com Subject: [RFC v2 3/9] VFIO: platform: single handler using function pointer Date: Mon, 6 Jul 2015 15:24:37 +0200 Message-Id: <1436189083-32527-4-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1436189083-32527-1-git-send-email-eric.auger@linaro.org> References: <1436189083-32527-1-git-send-email-eric.auger@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2972 Lines: 94 A single handler now is registered whatever the use case: automasked or not. A function pointer is set according to the wished behavior and the handler calls this function. The irq lock is taken/released in the root handler. eventfd_signal can be called in regions not allowed to sleep. Signed-off-by: Eric Auger --- v4: creation --- drivers/vfio/platform/vfio_platform_irq.c | 21 +++++++++++++++------ drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c index e39f795..7f8d27c 100644 --- a/drivers/vfio/platform/vfio_platform_irq.c +++ b/drivers/vfio/platform/vfio_platform_irq.c @@ -148,11 +148,8 @@ static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev, static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id) { struct vfio_platform_irq *irq_ctx = dev_id; - unsigned long flags; int ret = IRQ_NONE; - spin_lock_irqsave(&irq_ctx->lock, flags); - if (!irq_ctx->masked) { ret = IRQ_HANDLED; @@ -161,8 +158,6 @@ static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id) irq_ctx->masked = true; } - spin_unlock_irqrestore(&irq_ctx->lock, flags); - if (ret == IRQ_HANDLED) eventfd_signal(irq_ctx->trigger, 1); @@ -178,6 +173,19 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static irqreturn_t vfio_handler(int irq, void *dev_id) +{ + struct vfio_platform_irq *irq_ctx = dev_id; + unsigned long flags; + irqreturn_t ret; + + spin_lock_irqsave(&irq_ctx->lock, flags); + ret = irq_ctx->handler(irq, dev_id); + spin_unlock_irqrestore(&irq_ctx->lock, flags); + + return ret; +} + static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod) { } @@ -228,9 +236,10 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index, } irq->trigger = trigger; + irq->handler = handler; irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN); - ret = request_irq(irq->hwirq, handler, 0, irq->name, irq); + ret = request_irq(irq->hwirq, vfio_handler, 0, irq->name, irq); if (ret) { kfree(irq->name); eventfd_ctx_put(trigger); diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 1d2d4d6..9737981 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -39,6 +39,7 @@ struct vfio_platform_irq { struct virqfd *unmask; struct virqfd *mask; struct irq_bypass_producer producer; + irqreturn_t (*handler)(int irq, void *dev_id); }; struct vfio_platform_region { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/