Eric Lee / smarc-fsl-linux-kernel

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drivers/nvdimm/virtio_pmem.c 2.96 KB
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6e84200c0   Pankaj Gupta   virtio-pmem: Add ... 
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  // 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
  ",
  			__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
  ");
  		goto out_err;
  	}
02e715b7f   Michael S. Tsirkin   virtio_pmem: conv... 
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  	virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
6e84200c0   Pankaj Gupta   virtio-pmem: Add ... 
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  			start, &vpmem->start);
02e715b7f   Michael S. Tsirkin   virtio_pmem: conv... 
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  	virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
6e84200c0   Pankaj Gupta   virtio-pmem: Add ... 
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  			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
  ");
  		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
  ");
  		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");