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Date: Thu, 29 Jul 2021 15:34:54 +0800
From: Xie Yongji <xieyongji@...edance.com>
To: mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
sgarzare@...hat.com, parav@...dia.com, hch@...radead.org,
christian.brauner@...onical.com, rdunlap@...radead.org,
willy@...radead.org, viro@...iv.linux.org.uk, axboe@...nel.dk,
bcrl@...ck.org, corbet@....net, mika.penttila@...tfour.com,
dan.carpenter@...cle.com, joro@...tes.org,
gregkh@...uxfoundation.org, zhe.he@...driver.com,
xiaodong.liu@...el.com, joe@...ches.com
Cc: songmuchun@...edance.com,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH v10 08/17] virtio_config: Add a return value to reset function
This adds a return value to reset function so that we can
handle the reset failure later. No functional changes.
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
arch/um/drivers/virtio_uml.c | 4 +++-
drivers/platform/mellanox/mlxbf-tmfifo.c | 4 +++-
drivers/remoteproc/remoteproc_virtio.c | 4 +++-
drivers/s390/virtio/virtio_ccw.c | 6 ++++--
drivers/virtio/virtio_mmio.c | 4 +++-
drivers/virtio/virtio_pci_legacy.c | 4 +++-
drivers/virtio/virtio_pci_modern.c | 4 +++-
drivers/virtio/virtio_vdpa.c | 4 +++-
include/linux/virtio_config.h | 3 ++-
9 files changed, 27 insertions(+), 10 deletions(-)
diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index 4412d6febade..ca02deaf9b32 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -828,11 +828,13 @@ static void vu_set_status(struct virtio_device *vdev, u8 status)
vu_dev->status = status;
}
-static void vu_reset(struct virtio_device *vdev)
+static int vu_reset(struct virtio_device *vdev)
{
struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
vu_dev->status = 0;
+
+ return 0;
}
static void vu_del_vq(struct virtqueue *vq)
diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index 38800e86ed8a..e3c513c2d4fa 100644
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -989,11 +989,13 @@ static void mlxbf_tmfifo_virtio_set_status(struct virtio_device *vdev,
}
/* Reset the device. Not much here for now. */
-static void mlxbf_tmfifo_virtio_reset(struct virtio_device *vdev)
+static int mlxbf_tmfifo_virtio_reset(struct virtio_device *vdev)
{
struct mlxbf_tmfifo_vdev *tm_vdev = mlxbf_vdev_to_tmfifo(vdev);
tm_vdev->status = 0;
+
+ return 0;
}
/* Read the value of a configuration field. */
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index cf4d54e98e6a..975c845b3187 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -191,7 +191,7 @@ static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
dev_dbg(&vdev->dev, "status: %d\n", status);
}
-static void rproc_virtio_reset(struct virtio_device *vdev)
+static int rproc_virtio_reset(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
struct fw_rsc_vdev *rsc;
@@ -200,6 +200,8 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
rsc->status = 0;
dev_dbg(&vdev->dev, "reset !\n");
+
+ return 0;
}
/* provide the vdev features as retrieved from the firmware */
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index d35e7a3f7067..5221cdad531d 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -710,14 +710,14 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
return ret;
}
-static void virtio_ccw_reset(struct virtio_device *vdev)
+static int virtio_ccw_reset(struct virtio_device *vdev)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
struct ccw1 *ccw;
ccw = ccw_device_dma_zalloc(vcdev->cdev, sizeof(*ccw));
if (!ccw)
- return;
+ return -ENOMEM;
/* Zero status bits. */
vcdev->dma_area->status = 0;
@@ -729,6 +729,8 @@ static void virtio_ccw_reset(struct virtio_device *vdev)
ccw->cda = 0;
ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_RESET);
ccw_device_dma_free(vcdev->cdev, ccw, sizeof(*ccw));
+
+ return 0;
}
static u64 virtio_ccw_get_features(struct virtio_device *vdev)
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 56128b9c46eb..c0a65efa4a65 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -256,12 +256,14 @@ static void vm_set_status(struct virtio_device *vdev, u8 status)
writel(status, vm_dev->base + VIRTIO_MMIO_STATUS);
}
-static void vm_reset(struct virtio_device *vdev)
+static int vm_reset(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
/* 0 status means a reset. */
writel(0, vm_dev->base + VIRTIO_MMIO_STATUS);
+
+ return 0;
}
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index d62e9835aeec..0b5d95e3efa1 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -89,7 +89,7 @@ static void vp_set_status(struct virtio_device *vdev, u8 status)
iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
}
-static void vp_reset(struct virtio_device *vdev)
+static int vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* 0 status means a reset. */
@@ -99,6 +99,8 @@ static void vp_reset(struct virtio_device *vdev)
ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
+
+ return 0;
}
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 30654d3a0b41..b0cde3b2f0ff 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -158,7 +158,7 @@ static void vp_set_status(struct virtio_device *vdev, u8 status)
vp_modern_set_status(&vp_dev->mdev, status);
}
-static void vp_reset(struct virtio_device *vdev)
+static int vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
@@ -174,6 +174,8 @@ static void vp_reset(struct virtio_device *vdev)
msleep(1);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
+
+ return 0;
}
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index ff43f9b62b2f..3e666f70e829 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -97,11 +97,13 @@ static void virtio_vdpa_set_status(struct virtio_device *vdev, u8 status)
return ops->set_status(vdpa, status);
}
-static void virtio_vdpa_reset(struct virtio_device *vdev)
+static int virtio_vdpa_reset(struct virtio_device *vdev)
{
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
vdpa_reset(vdpa);
+
+ return 0;
}
static bool virtio_vdpa_notify(struct virtqueue *vq)
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 8519b3ae5d52..203407992c30 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -47,6 +47,7 @@ struct virtio_shm_region {
* After this, status and feature negotiation must be done again
* Device must not be reset from its vq/config callbacks, or in
* parallel with being added/removed.
+ * Returns 0 on success or error status
* @find_vqs: find virtqueues and instantiate them.
* vdev: the virtio_device
* nvqs: the number of virtqueues to find
@@ -82,7 +83,7 @@ struct virtio_config_ops {
u32 (*generation)(struct virtio_device *vdev);
u8 (*get_status)(struct virtio_device *vdev);
void (*set_status)(struct virtio_device *vdev, u8 status);
- void (*reset)(struct virtio_device *vdev);
+ int (*reset)(struct virtio_device *vdev);
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], const bool *ctx,
--
2.11.0
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