From 813ae66008aeb97a48f20efefeb962179b642dbe Mon Sep 17 00:00:00 2001 From: Eric Auger Date: Mon, 15 Jun 2015 11:09:43 +0200 Subject: [PATCH] VFIO: platform: add reset callback A new reset callback is introduced. If this callback is populated, the reset is invoked on device first open/last close or upon userspace ioctl. The modality is exposed on VFIO_DEVICE_GET_INFO. Signed-off-by: Eric Auger Acked-by: Baptiste Reynal Tested-by: Baptiste Reynal Signed-off-by: Alex Williamson --- drivers/vfio/platform/vfio_platform_common.c | 15 +++++++++++++-- drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 611597e..6393581 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 (vdev->reset) + vdev->reset(vdev); vfio_platform_regions_cleanup(vdev); vfio_platform_irq_cleanup(vdev); } @@ -130,6 +132,9 @@ static int vfio_platform_open(void *device_data) ret = vfio_platform_irq_init(vdev); if (ret) goto err_irq; + + if (vdev->reset) + vdev->reset(vdev); } vdev->refcnt++; @@ -162,6 +167,8 @@ 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; @@ -255,8 +262,12 @@ 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 -EINVAL; + } return -ENOTTY; } diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 9e37b9f..1c9b3d5 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -67,6 +67,7 @@ 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); }; struct vfio_platform_reset_combo { -- 2.7.4