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author | Dan Williams <dan.j.williams@intel.com> | 2016-05-18 16:59:34 (GMT) |
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committer | Dan Williams <dan.j.williams@intel.com> | 2016-05-18 16:59:34 (GMT) |
commit | 594d6d96ea042366878aa7dc7f5711b8c245db5a (patch) | |
tree | 1b7333bf5b5c1147e136f050d686ab4f888ab85f /drivers/nvdimm/dax_devs.c | |
parent | 1b8d2afde54fade94339f573c4e05644f9ae9866 (diff) | |
parent | 45a0dac0451136fa7ae34a6fea53ef6a136287ce (diff) | |
download | linux-594d6d96ea042366878aa7dc7f5711b8c245db5a.tar.xz |
Merge branch 'for-4.7/dax' into libnvdimm-for-next
Diffstat (limited to 'drivers/nvdimm/dax_devs.c')
-rw-r--r-- | drivers/nvdimm/dax_devs.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c new file mode 100644 index 0000000..f90f754 --- /dev/null +++ b/drivers/nvdimm/dax_devs.c @@ -0,0 +1,99 @@ +/* + * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ +#include <linux/device.h> +#include <linux/sizes.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include "nd-core.h" +#include "nd.h" + +static void nd_dax_release(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_dax *nd_dax = to_nd_dax(dev); + struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; + + dev_dbg(dev, "%s\n", __func__); + nd_detach_ndns(dev, &nd_pfn->ndns); + ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); + kfree(nd_pfn->uuid); + kfree(nd_dax); +} + +static struct device_type nd_dax_device_type = { + .name = "nd_dax", + .release = nd_dax_release, +}; + +bool is_nd_dax(struct device *dev) +{ + return dev ? dev->type == &nd_dax_device_type : false; +} +EXPORT_SYMBOL(is_nd_dax); + +struct nd_dax *to_nd_dax(struct device *dev) +{ + struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); + + WARN_ON(!is_nd_dax(dev)); + return nd_dax; +} +EXPORT_SYMBOL(to_nd_dax); + +static const struct attribute_group *nd_dax_attribute_groups[] = { + &nd_pfn_attribute_group, + &nd_device_attribute_group, + &nd_numa_attribute_group, + NULL, +}; + +static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) +{ + struct nd_pfn *nd_pfn; + struct nd_dax *nd_dax; + struct device *dev; + + nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); + if (!nd_dax) + return NULL; + + nd_pfn = &nd_dax->nd_pfn; + nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); + if (nd_pfn->id < 0) { + kfree(nd_dax); + return NULL; + } + + dev = &nd_pfn->dev; + dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); + dev->groups = nd_dax_attribute_groups; + dev->type = &nd_dax_device_type; + dev->parent = &nd_region->dev; + + return nd_dax; +} + +struct device *nd_dax_create(struct nd_region *nd_region) +{ + struct device *dev = NULL; + struct nd_dax *nd_dax; + + if (!is_nd_pmem(&nd_region->dev)) + return NULL; + + nd_dax = nd_dax_alloc(nd_region); + if (nd_dax) + dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); + __nd_device_register(dev); + return dev; +} |