| 1 | |
| 2 |
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| 3 | #include <linux/memremap.h>
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| 4 | #include <linux/module.h>
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| 5 | #include "../nvdimm/pfn.h"
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| 6 | #include "../nvdimm/nd.h"
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| 7 | #include "bus.h"
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| 8 |
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| 9 | static struct dev_dax *__dax_pmem_probe(struct device *dev)
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| 10 | {
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| 11 | struct range range;
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| 12 | int rc, id, region_id;
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| 13 | resource_size_t offset;
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| 14 | struct nd_pfn_sb *pfn_sb;
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| 15 | struct dev_dax_data data;
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| 16 | struct nd_namespace_io *nsio;
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| 17 | struct dax_region *dax_region;
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| 18 | struct dev_pagemap pgmap = { };
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| 19 | struct nd_namespace_common *ndns;
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| 20 | struct nd_dax *nd_dax = to_nd_dax(dev);
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| 21 | struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
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| 22 | struct nd_region *nd_region = to_nd_region(dev->parent);
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| 23 |
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| 24 | ndns = nvdimm_namespace_common_probe(dev);
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| 25 | if (IS_ERR(ndns))
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| 26 | return ERR_CAST(ndns);
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| 27 |
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| 28 |
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| 29 | rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
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| 30 | if (rc)
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| 31 | return ERR_PTR(rc);
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| 32 | rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
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| 33 | if (rc)
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| 34 | return ERR_PTR(rc);
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| 35 | devm_namespace_disable(dev, ndns);
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| 36 |
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| 37 |
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| 38 | pfn_sb = nd_pfn->pfn_sb;
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| 39 | offset = le64_to_cpu(pfn_sb->dataoff);
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| 40 | nsio = to_nd_namespace_io(&ndns->dev);
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| 41 | if (!devm_request_mem_region(dev, nsio->res.start, offset,
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| 42 | dev_name(&ndns->dev))) {
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| 43 | dev_warn(dev, "could not reserve metadata\n");
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| 44 | return ERR_PTR(-EBUSY);
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| 45 | }
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| 46 |
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| 47 | rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id);
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| 48 | if (rc != 2)
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| 49 | return ERR_PTR(-EINVAL);
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| 50 |
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| 51 |
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| 52 | range = pgmap.range;
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| 53 | range.start += offset;
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| 54 | dax_region = alloc_dax_region(dev, region_id, &range,
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| 55 | nd_region->target_node, le32_to_cpu(pfn_sb->align),
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| 56 | IORESOURCE_DAX_STATIC);
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| 57 | if (!dax_region)
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| 58 | return ERR_PTR(-ENOMEM);
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| 59 |
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| 60 | data = (struct dev_dax_data) {
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| 61 | .dax_region = dax_region,
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| 62 | .id = id,
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| 63 | .pgmap = &pgmap,
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| 64 | .size = range_len(&range),
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| 65 | .memmap_on_memory = false,
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| 66 | };
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| 67 |
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| 68 | return devm_create_dev_dax(&data);
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| 69 | }
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| 70 |
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| 71 | static int dax_pmem_probe(struct device *dev)
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| 72 | {
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| 73 | return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev));
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| 74 | }
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| 75 |
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| 76 | static struct nd_device_driver dax_pmem_driver = {
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| 77 | .probe = dax_pmem_probe,
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| 78 | .drv = {
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| 79 | .name = "dax_pmem",
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| 80 | },
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| 81 | .type = ND_DRIVER_DAX_PMEM,
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| 82 | };
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| 83 |
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| 84 | static int __init dax_pmem_init(void)
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| 85 | {
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| 86 | return nd_driver_register(&dax_pmem_driver);
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| 87 | }
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| 88 | module_init(dax_pmem_init);
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| 89 |
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| 90 | static void __exit dax_pmem_exit(void)
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| 91 | {
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| 92 | driver_unregister(&dax_pmem_driver.drv);
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| 93 | }
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| 94 | module_exit(dax_pmem_exit);
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| 95 |
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| 96 | MODULE_DESCRIPTION("PMEM DAX: direct access to persistent memory");
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| 97 | MODULE_LICENSE("GPL v2");
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| 98 | MODULE_AUTHOR("Intel Corporation");
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| 99 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
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