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path: root/drivers/nvdimm/virtio_pmem.c
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Diffstat (limited to 'drivers/nvdimm/virtio_pmem.c')
-rw-r--r--drivers/nvdimm/virtio_pmem.c36
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
index a92eb172f0..4ceced5cef 100644
--- a/drivers/nvdimm/virtio_pmem.c
+++ b/drivers/nvdimm/virtio_pmem.c
@@ -29,12 +29,27 @@ static int init_vq(struct virtio_pmem *vpmem)
return 0;
};
+static int virtio_pmem_validate(struct virtio_device *vdev)
+{
+ struct virtio_shm_region shm_reg;
+
+ if (virtio_has_feature(vdev, VIRTIO_PMEM_F_SHMEM_REGION) &&
+ !virtio_get_shm_region(vdev, &shm_reg, (u8)VIRTIO_PMEM_SHMEM_REGION_ID)
+ ) {
+ dev_notice(&vdev->dev, "failed to get shared memory region %d\n",
+ VIRTIO_PMEM_SHMEM_REGION_ID);
+ __virtio_clear_bit(vdev, VIRTIO_PMEM_F_SHMEM_REGION);
+ }
+ return 0;
+}
+
static int virtio_pmem_probe(struct virtio_device *vdev)
{
struct nd_region_desc ndr_desc = {};
struct nd_region *nd_region;
struct virtio_pmem *vpmem;
struct resource res;
+ struct virtio_shm_region shm_reg;
int err = 0;
if (!vdev->config->get) {
@@ -57,10 +72,16 @@ static int virtio_pmem_probe(struct virtio_device *vdev)
goto out_err;
}
- virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
- start, &vpmem->start);
- virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
- size, &vpmem->size);
+ if (virtio_has_feature(vdev, VIRTIO_PMEM_F_SHMEM_REGION)) {
+ virtio_get_shm_region(vdev, &shm_reg, (u8)VIRTIO_PMEM_SHMEM_REGION_ID);
+ vpmem->start = shm_reg.addr;
+ vpmem->size = shm_reg.len;
+ } else {
+ virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
+ start, &vpmem->start);
+ virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
+ size, &vpmem->size);
+ }
res.start = vpmem->start;
res.end = vpmem->start + vpmem->size - 1;
@@ -122,10 +143,17 @@ static void virtio_pmem_remove(struct virtio_device *vdev)
virtio_reset_device(vdev);
}
+static unsigned int features[] = {
+ VIRTIO_PMEM_F_SHMEM_REGION,
+};
+
static struct virtio_driver virtio_pmem_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
+ .validate = virtio_pmem_validate,
.probe = virtio_pmem_probe,
.remove = virtio_pmem_remove,
};