Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752662AbbEGOab (ORCPT ); Thu, 7 May 2015 10:30:31 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:36040 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752265AbbEGOaV (ORCPT ); Thu, 7 May 2015 10:30:21 -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, b.reynal@virtualopensystems.com Cc: linux-kernel@vger.kernel.org, patches@linaro.org, agraf@suse.de, Bharat.Bhushan@freescale.com Subject: [PATCH 3/5] VFIO: platform: add reset callback Date: Thu, 7 May 2015 16:27:21 +0200 Message-Id: <1431008843-28411-4-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1431008843-28411-1-git-send-email-eric.auger@linaro.org> References: <1431008843-28411-1-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: 2629 Lines: 77 A new reset callback is introduced. If this callback is populated, the reset is invoked on device release or upon userspace ioctl. The modality is exposed on VFIO_DEVICE_GET_INFO. Signed-off-by: Eric Auger --- v2 -> v3: - change patch title and commit message. Use IS_ERR_OR_NULL to anticipate for getter returned value. v1 -> v2: - On VFIO_DEVICE_RESET returns -EINVAL in case the callback is not populated (instead of -ENOTTY) --- 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 edbf24c..0d10018 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -103,6 +103,8 @@ static void vfio_platform_release(void *device_data) mutex_lock(&driver_lock); if (!(--vdev->refcnt)) { + if (!IS_ERR_OR_NULL(vdev->reset)) + vdev->reset(vdev); vfio_platform_regions_cleanup(vdev); vfio_platform_irq_cleanup(vdev); } @@ -162,6 +164,8 @@ static long vfio_platform_ioctl(void *device_data, if (info.argsz < minsz) return -EINVAL; + if (!IS_ERR_OR_NULL(vdev->reset)) + vdev->flags |= VFIO_DEVICE_FLAGS_RESET; info.flags = vdev->flags; info.num_regions = vdev->num_regions; info.num_irqs = vdev->num_irqs; @@ -255,8 +259,12 @@ 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 (!IS_ERR_OR_NULL(vdev->reset)) + return vdev->reset(vdev); + else + return -EINVAL; + } return -ENOTTY; } diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 68909a4..84ccf6d 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 { (*get_resource)(struct vfio_platform_device *vdev, int i); int (*get_irq)(struct vfio_platform_device *vdev, int i); struct device *(*get_device)(struct vfio_platform_device *vdev); + int (*reset)(struct vfio_platform_device *vdev); }; typedef int (*vfio_platform_reset_fn_t)(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/