123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* virtio_pmem.c: Virtio pmem Driver
|
|
*
|
|
* Discovers persistent memory range information
|
|
* from host and registers the virtual pmem device
|
|
* with libnvdimm core.
|
|
*/
|
|
#include "virtio_pmem.h"
|
|
#include "nd.h"
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
{ VIRTIO_ID_PMEM, VIRTIO_DEV_ANY_ID },
|
|
{ 0 },
|
|
};
|
|
|
|
/* Initialize virt queue */
|
|
static int init_vq(struct virtio_pmem *vpmem)
|
|
{
|
|
/* single vq */
|
|
vpmem->req_vq = virtio_find_single_vq(vpmem->vdev,
|
|
virtio_pmem_host_ack, "flush_queue");
|
|
if (IS_ERR(vpmem->req_vq))
|
|
return PTR_ERR(vpmem->req_vq);
|
|
|
|
spin_lock_init(&vpmem->pmem_lock);
|
|
INIT_LIST_HEAD(&vpmem->req_list);
|
|
|
|
return 0;
|
|
};
|
|
|
|
static int virtio_pmem_probe(struct virtio_device *vdev)
|
|
{
|
|
struct nd_region_desc ndr_desc = {};
|
|
int nid = dev_to_node(&vdev->dev);
|
|
struct nd_region *nd_region;
|
|
struct virtio_pmem *vpmem;
|
|
struct resource res;
|
|
int err = 0;
|
|
|
|
if (!vdev->config->get) {
|
|
dev_err(&vdev->dev, "%s failure: config access disabled\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
vpmem = devm_kzalloc(&vdev->dev, sizeof(*vpmem), GFP_KERNEL);
|
|
if (!vpmem) {
|
|
err = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
vpmem->vdev = vdev;
|
|
vdev->priv = vpmem;
|
|
err = init_vq(vpmem);
|
|
if (err) {
|
|
dev_err(&vdev->dev, "failed to initialize virtio pmem vq's\n");
|
|
goto out_err;
|
|
}
|
|
|
|
virtio_cread(vpmem->vdev, struct virtio_pmem_config,
|
|
start, &vpmem->start);
|
|
virtio_cread(vpmem->vdev, struct virtio_pmem_config,
|
|
size, &vpmem->size);
|
|
|
|
res.start = vpmem->start;
|
|
res.end = vpmem->start + vpmem->size - 1;
|
|
vpmem->nd_desc.provider_name = "virtio-pmem";
|
|
vpmem->nd_desc.module = THIS_MODULE;
|
|
|
|
vpmem->nvdimm_bus = nvdimm_bus_register(&vdev->dev,
|
|
&vpmem->nd_desc);
|
|
if (!vpmem->nvdimm_bus) {
|
|
dev_err(&vdev->dev, "failed to register device with nvdimm_bus\n");
|
|
err = -ENXIO;
|
|
goto out_vq;
|
|
}
|
|
|
|
dev_set_drvdata(&vdev->dev, vpmem->nvdimm_bus);
|
|
|
|
ndr_desc.res = &res;
|
|
ndr_desc.numa_node = nid;
|
|
ndr_desc.flush = async_pmem_flush;
|
|
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
|
|
set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
|
|
nd_region = nvdimm_pmem_region_create(vpmem->nvdimm_bus, &ndr_desc);
|
|
if (!nd_region) {
|
|
dev_err(&vdev->dev, "failed to create nvdimm region\n");
|
|
err = -ENXIO;
|
|
goto out_nd;
|
|
}
|
|
nd_region->provider_data = dev_to_virtio(nd_region->dev.parent->parent);
|
|
return 0;
|
|
out_nd:
|
|
nvdimm_bus_unregister(vpmem->nvdimm_bus);
|
|
out_vq:
|
|
vdev->config->del_vqs(vdev);
|
|
out_err:
|
|
return err;
|
|
}
|
|
|
|
static void virtio_pmem_remove(struct virtio_device *vdev)
|
|
{
|
|
struct nvdimm_bus *nvdimm_bus = dev_get_drvdata(&vdev->dev);
|
|
|
|
nvdimm_bus_unregister(nvdimm_bus);
|
|
vdev->config->del_vqs(vdev);
|
|
vdev->config->reset(vdev);
|
|
}
|
|
|
|
static struct virtio_driver virtio_pmem_driver = {
|
|
.driver.name = KBUILD_MODNAME,
|
|
.driver.owner = THIS_MODULE,
|
|
.id_table = id_table,
|
|
.probe = virtio_pmem_probe,
|
|
.remove = virtio_pmem_remove,
|
|
};
|
|
|
|
module_virtio_driver(virtio_pmem_driver);
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
|
MODULE_DESCRIPTION("Virtio pmem driver");
|
|
MODULE_LICENSE("GPL");
|