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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/nvdimm/virtio_pmem.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/nvdimm/virtio_pmem.c')
-rw-r--r--drivers/nvdimm/virtio_pmem.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
new file mode 100644
index 0000000000..a92eb172f0
--- /dev/null
+++ b/drivers/nvdimm/virtio_pmem.c
@@ -0,0 +1,136 @@
+// 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 = {};
+ 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_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;
+ 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 = memory_add_physaddr_to_nid(res.start);
+ ndr_desc.target_node = phys_to_target_node(res.start);
+ if (ndr_desc.target_node == NUMA_NO_NODE) {
+ ndr_desc.target_node = ndr_desc.numa_node;
+ dev_dbg(&vdev->dev, "changing target node from %d to %d",
+ NUMA_NO_NODE, ndr_desc.target_node);
+ }
+
+ ndr_desc.flush = async_pmem_flush;
+ ndr_desc.provider_data = vdev;
+ set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
+ set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
+ /*
+ * The NVDIMM region could be available before the
+ * virtio_device_ready() that is called by
+ * virtio_dev_probe(), so we set device ready here.
+ */
+ virtio_device_ready(vdev);
+ 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;
+ }
+ return 0;
+out_nd:
+ virtio_reset_device(vdev);
+ 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);
+ virtio_reset_device(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");