forked from Minki/linux
5d66322b2b
The NVDIMM region could be available before the virtio_device_ready()
that is called by virtio_dev_probe(). This means the driver tries to
use device before DRIVER_OK which violates the spec, fixing this by
set device ready before the nvdimm_pmem_region_create().
Note that this means the virtio_pmem_host_ack() could be triggered
before the creation of the nd region, this is safe since the pmem_lock
has been initialized and whether or not any available buffer is added
before is validated by virtio_pmem_host_ack().
Fixes 6e84200c0a ("virtio-pmem: Add virtio pmem driver")
Acked-by: Pankaj Gupta <pankaj.gupta@amd.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220628083430.61856-2-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* virtio_pmem.c: Virtio pmem Driver
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*
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* Discovers persistent memory range information
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* from host and registers the virtual pmem device
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* with libnvdimm core.
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*/
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#include "virtio_pmem.h"
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#include "nd.h"
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static struct virtio_device_id id_table[] = {
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{ VIRTIO_ID_PMEM, VIRTIO_DEV_ANY_ID },
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{ 0 },
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};
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/* Initialize virt queue */
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static int init_vq(struct virtio_pmem *vpmem)
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{
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/* single vq */
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vpmem->req_vq = virtio_find_single_vq(vpmem->vdev,
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virtio_pmem_host_ack, "flush_queue");
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if (IS_ERR(vpmem->req_vq))
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return PTR_ERR(vpmem->req_vq);
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spin_lock_init(&vpmem->pmem_lock);
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INIT_LIST_HEAD(&vpmem->req_list);
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return 0;
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};
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static int virtio_pmem_probe(struct virtio_device *vdev)
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{
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struct nd_region_desc ndr_desc = {};
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int nid = dev_to_node(&vdev->dev);
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struct nd_region *nd_region;
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struct virtio_pmem *vpmem;
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struct resource res;
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int err = 0;
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if (!vdev->config->get) {
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dev_err(&vdev->dev, "%s failure: config access disabled\n",
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__func__);
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return -EINVAL;
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}
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vpmem = devm_kzalloc(&vdev->dev, sizeof(*vpmem), GFP_KERNEL);
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if (!vpmem) {
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err = -ENOMEM;
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goto out_err;
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}
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vpmem->vdev = vdev;
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vdev->priv = vpmem;
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err = init_vq(vpmem);
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if (err) {
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dev_err(&vdev->dev, "failed to initialize virtio pmem vq's\n");
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goto out_err;
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}
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virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
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start, &vpmem->start);
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virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
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size, &vpmem->size);
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res.start = vpmem->start;
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res.end = vpmem->start + vpmem->size - 1;
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vpmem->nd_desc.provider_name = "virtio-pmem";
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vpmem->nd_desc.module = THIS_MODULE;
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vpmem->nvdimm_bus = nvdimm_bus_register(&vdev->dev,
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&vpmem->nd_desc);
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if (!vpmem->nvdimm_bus) {
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dev_err(&vdev->dev, "failed to register device with nvdimm_bus\n");
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err = -ENXIO;
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goto out_vq;
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}
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dev_set_drvdata(&vdev->dev, vpmem->nvdimm_bus);
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ndr_desc.res = &res;
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ndr_desc.numa_node = nid;
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ndr_desc.flush = async_pmem_flush;
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ndr_desc.provider_data = vdev;
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set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
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set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
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/*
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* The NVDIMM region could be available before the
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* virtio_device_ready() that is called by
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* virtio_dev_probe(), so we set device ready here.
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*/
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virtio_device_ready(vdev);
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nd_region = nvdimm_pmem_region_create(vpmem->nvdimm_bus, &ndr_desc);
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if (!nd_region) {
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dev_err(&vdev->dev, "failed to create nvdimm region\n");
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err = -ENXIO;
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goto out_nd;
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}
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return 0;
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out_nd:
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virtio_reset_device(vdev);
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nvdimm_bus_unregister(vpmem->nvdimm_bus);
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out_vq:
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vdev->config->del_vqs(vdev);
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out_err:
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return err;
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}
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static void virtio_pmem_remove(struct virtio_device *vdev)
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{
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struct nvdimm_bus *nvdimm_bus = dev_get_drvdata(&vdev->dev);
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nvdimm_bus_unregister(nvdimm_bus);
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vdev->config->del_vqs(vdev);
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virtio_reset_device(vdev);
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}
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static struct virtio_driver virtio_pmem_driver = {
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.id_table = id_table,
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.probe = virtio_pmem_probe,
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.remove = virtio_pmem_remove,
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};
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module_virtio_driver(virtio_pmem_driver);
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MODULE_DEVICE_TABLE(virtio, id_table);
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MODULE_DESCRIPTION("Virtio pmem driver");
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MODULE_LICENSE("GPL");
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