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126 lines
2.8 KiB
126 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright(c) 2013-2016 Intel Corporation. All rights reserved. |
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*/ |
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#include <linux/device.h> |
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#include <linux/sizes.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include "nd-core.h" |
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#include "pfn.h" |
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#include "nd.h" |
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static void nd_dax_release(struct device *dev) |
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{ |
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struct nd_region *nd_region = to_nd_region(dev->parent); |
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struct nd_dax *nd_dax = to_nd_dax(dev); |
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struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; |
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dev_dbg(dev, "trace\n"); |
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nd_detach_ndns(dev, &nd_pfn->ndns); |
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ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); |
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kfree(nd_pfn->uuid); |
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kfree(nd_dax); |
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} |
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struct nd_dax *to_nd_dax(struct device *dev) |
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{ |
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struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); |
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WARN_ON(!is_nd_dax(dev)); |
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return nd_dax; |
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} |
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EXPORT_SYMBOL(to_nd_dax); |
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static const struct device_type nd_dax_device_type = { |
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.name = "nd_dax", |
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.release = nd_dax_release, |
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.groups = nd_pfn_attribute_groups, |
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}; |
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bool is_nd_dax(struct device *dev) |
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{ |
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return dev ? dev->type == &nd_dax_device_type : false; |
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} |
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EXPORT_SYMBOL(is_nd_dax); |
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static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) |
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{ |
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struct nd_pfn *nd_pfn; |
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struct nd_dax *nd_dax; |
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struct device *dev; |
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nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); |
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if (!nd_dax) |
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return NULL; |
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nd_pfn = &nd_dax->nd_pfn; |
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nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); |
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if (nd_pfn->id < 0) { |
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kfree(nd_dax); |
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return NULL; |
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} |
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dev = &nd_pfn->dev; |
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dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); |
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dev->type = &nd_dax_device_type; |
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dev->parent = &nd_region->dev; |
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return nd_dax; |
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} |
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struct device *nd_dax_create(struct nd_region *nd_region) |
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{ |
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struct device *dev = NULL; |
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struct nd_dax *nd_dax; |
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if (!is_memory(&nd_region->dev)) |
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return NULL; |
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nd_dax = nd_dax_alloc(nd_region); |
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if (nd_dax) |
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dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); |
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__nd_device_register(dev); |
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return dev; |
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} |
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int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns) |
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{ |
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int rc; |
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struct nd_dax *nd_dax; |
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struct device *dax_dev; |
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struct nd_pfn *nd_pfn; |
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struct nd_pfn_sb *pfn_sb; |
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struct nd_region *nd_region = to_nd_region(ndns->dev.parent); |
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if (ndns->force_raw) |
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return -ENODEV; |
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switch (ndns->claim_class) { |
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case NVDIMM_CCLASS_NONE: |
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case NVDIMM_CCLASS_DAX: |
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break; |
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default: |
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return -ENODEV; |
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} |
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nvdimm_bus_lock(&ndns->dev); |
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nd_dax = nd_dax_alloc(nd_region); |
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nd_pfn = &nd_dax->nd_pfn; |
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dax_dev = nd_pfn_devinit(nd_pfn, ndns); |
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nvdimm_bus_unlock(&ndns->dev); |
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if (!dax_dev) |
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return -ENOMEM; |
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pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); |
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nd_pfn->pfn_sb = pfn_sb; |
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rc = nd_pfn_validate(nd_pfn, DAX_SIG); |
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dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>"); |
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if (rc < 0) { |
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nd_detach_ndns(dax_dev, &nd_pfn->ndns); |
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put_device(dax_dev); |
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} else |
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__nd_device_register(dax_dev); |
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return rc; |
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} |
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EXPORT_SYMBOL(nd_dax_probe);
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