Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933919AbbDQNkO (ORCPT ); Fri, 17 Apr 2015 09:40:14 -0400 Received: from mail-wg0-f42.google.com ([74.125.82.42]:35450 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753883AbbDQNkF (ORCPT ); Fri, 17 Apr 2015 09:40:05 -0400 From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, alex.williamson@redhat.com, agraf@suse.de, b.reynal@virtualopensystems.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, Bharat.Bhushan@freescale.com Subject: [RFC 1/3] VFIO: platform: add reset support Date: Fri, 17 Apr 2015 15:37:11 +0200 Message-Id: <1429277833-28663-2-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1429277833-28663-1-git-send-email-eric.auger@linaro.org> References: <1429277833-28663-1-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: 2427 Lines: 69 This patch adds support for vfio platform reset. The modality only is exposed when a specialized VFIO driver populates the reset callback. For the generic vfio platform/amba driver, the modality is not supported since the driver is by essence a metadriver and does not know how to reset the underlying device. Signed-off-by: Eric Auger --- drivers/vfio/platform/vfio_platform_common.c | 12 ++++++++++-- drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 4113d46..b989ce5 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -100,6 +100,8 @@ static void vfio_platform_release(void *device_data) mutex_lock(&driver_lock); if (!(--vdev->refcnt)) { + if (vdev->reset) + vdev->reset(vdev); vfio_platform_regions_cleanup(vdev); vfio_platform_irq_cleanup(vdev); } @@ -159,6 +161,8 @@ static long vfio_platform_ioctl(void *device_data, if (info.argsz < minsz) return -EINVAL; + if (vdev->reset) + vdev->flags |= VFIO_DEVICE_FLAGS_RESET; info.flags = vdev->flags; info.num_regions = vdev->num_regions; info.num_irqs = vdev->num_irqs; @@ -252,8 +256,12 @@ static long vfio_platform_ioctl(void *device_data, return ret; - } else if (cmd == VFIO_DEVICE_RESET) - return -EINVAL; + } else if (cmd == VFIO_DEVICE_RESET) { + if (vdev->reset) + return vdev->reset(vdev); + else + return -ENOTTY; + } return -ENOTTY; } diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 253caa3..0a20028 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -68,6 +68,7 @@ struct vfio_platform_device { struct resource* (*get_resource)(struct vfio_platform_device *vdev, int i); int (*get_irq)(struct vfio_platform_device *vdev, int i); + int (*reset)(struct vfio_platform_device *vdev); }; extern int vfio_platform_probe_common(struct vfio_platform_device *vdev, -- 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/