From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932440AbaIWOtw (ORCPT ); Tue, 23 Sep 2014 10:49:52 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:37166 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932420AbaIWOtr (ORCPT ); Tue, 23 Sep 2014 10:49:47 -0400 From: Antonios Motakis To: alex.williamson@redhat.com, kvmarm@lists.cs.columbia.edu, iommu@lists.linux-foundation.org Cc: tech@virtualopensystems.com, kvm@vger.kernel.org, christoffer.dall@linaro.org, will.deacon@arm.com, kim.phillips@freescale.com, eric.auger@linaro.org, marc.zyngier@arm.com, Antonios Motakis , linux-kernel@vger.kernel.org (open list) Subject: [PATCHv7 26/26] vfio/platform: implement IRQ masking/unmasking via an eventfd Date: Tue, 23 Sep 2014 16:46:25 +0200 Message-Id: <1411483586-29304-27-git-send-email-a.motakis@virtualopensystems.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1411483586-29304-1-git-send-email-a.motakis@virtualopensystems.com> References: <1411483586-29304-1-git-send-email-a.motakis@virtualopensystems.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With this patch the VFIO user will be able to set an eventfd that can be used in order to mask and unmask IRQs of platform devices. Signed-off-by: Antonios Motakis --- drivers/vfio/platform/vfio_platform_irq.c | 48 +++++++++++++++++++++++++-- drivers/vfio/platform/vfio_platform_private.h | 2 ++ 2 files changed, 48 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c index 90fa25a..4ea3d5a 100644 --- a/drivers/vfio/platform/vfio_platform_irq.c +++ b/drivers/vfio/platform/vfio_platform_irq.c @@ -45,11 +45,21 @@ static void vfio_platform_mask(struct vfio_platform_irq *irq_ctx) spin_unlock_irqrestore(&irq_ctx->lock, flags); } +static int vfio_platform_mask_handler(void *opaque, void *unused) +{ + struct vfio_platform_irq *irq_ctx = opaque; + + vfio_platform_mask(irq_ctx); + + return 0; +} + static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev, unsigned index, unsigned start, unsigned count, uint32_t flags, void *data) { uint8_t irq_bitmap; + int32_t fd; if (start != 0 || count != 1) return -EINVAL; @@ -75,7 +85,19 @@ static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev, vfio_platform_mask(&vdev->irqs[index]); return 0; - case VFIO_IRQ_SET_DATA_EVENTFD: /* XXX not implemented yet */ + case VFIO_IRQ_SET_DATA_EVENTFD: + if (copy_from_user(&fd, data, sizeof(int32_t))) + return -EFAULT; + + if (fd >= 0) + return virqfd_enable((void *) &vdev->irqs[index], + vfio_platform_mask_handler, + NULL, NULL, + &vdev->irqs[index].mask, fd); + + virqfd_disable(&vdev->irqs[index].mask); + return 0; + default: return -ENOTTY; } @@ -97,11 +119,21 @@ static void vfio_platform_unmask(struct vfio_platform_irq *irq_ctx) spin_unlock_irqrestore(&irq_ctx->lock, flags); } +static int vfio_platform_unmask_handler(void *opaque, void *unused) +{ + struct vfio_platform_irq *irq_ctx = opaque; + + vfio_platform_unmask(irq_ctx); + + return 0; +} + static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev, unsigned index, unsigned start, unsigned count, uint32_t flags, void *data) { uint8_t irq_bitmap; + int32_t fd; if (start != 0 || count != 1) return -EINVAL; @@ -123,7 +155,19 @@ static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev, vfio_platform_unmask(&vdev->irqs[index]); return 0; - case VFIO_IRQ_SET_DATA_EVENTFD: /* XXX not implemented yet */ + case VFIO_IRQ_SET_DATA_EVENTFD: + if (copy_from_user(&fd, data, sizeof(int32_t))) + return -EFAULT; + + if (fd >= 0) + return virqfd_enable((void *) &vdev->irqs[index], + vfio_platform_unmask_handler, + NULL, NULL, + &vdev->irqs[index].unmask, fd); + + virqfd_disable(&vdev->irqs[index].unmask); + return 0; + default: return -ENOTTY; } diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 500e299..dd1beda 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -32,6 +32,8 @@ struct vfio_platform_irq { struct eventfd_ctx *trigger; bool masked; spinlock_t lock; + struct virqfd *unmask; + struct virqfd *mask; }; struct vfio_platform_region { -- 1.8.3.2