X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fnvdimm%2Fbtt_devs.c;fp=kernel%2Fdrivers%2Fnvdimm%2Fbtt_devs.c;h=cb477518dd0e4d397ede8ccc83ffe2f29ceb02a6;hb=e09b41010ba33a20a87472ee821fa407a5b8da36;hp=0000000000000000000000000000000000000000;hpb=f93b97fd65072de626c074dbe099a1fff05ce060;p=kvmfornfv.git diff --git a/kernel/drivers/nvdimm/btt_devs.c b/kernel/drivers/nvdimm/btt_devs.c new file mode 100644 index 000000000..cb477518d --- /dev/null +++ b/kernel/drivers/nvdimm/btt_devs.c @@ -0,0 +1,306 @@ +/* + * Copyright(c) 2013-2015 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 +#include +#include +#include +#include +#include +#include +#include "nd-core.h" +#include "btt.h" +#include "nd.h" + +static void nd_btt_release(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_btt *nd_btt = to_nd_btt(dev); + + dev_dbg(dev, "%s\n", __func__); + nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns); + ida_simple_remove(&nd_region->btt_ida, nd_btt->id); + kfree(nd_btt->uuid); + kfree(nd_btt); +} + +static struct device_type nd_btt_device_type = { + .name = "nd_btt", + .release = nd_btt_release, +}; + +bool is_nd_btt(struct device *dev) +{ + return dev->type == &nd_btt_device_type; +} +EXPORT_SYMBOL(is_nd_btt); + +struct nd_btt *to_nd_btt(struct device *dev) +{ + struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev); + + WARN_ON(!is_nd_btt(dev)); + return nd_btt; +} +EXPORT_SYMBOL(to_nd_btt); + +static const unsigned long btt_lbasize_supported[] = { 512, 520, 528, + 4096, 4104, 4160, 4224, 0 }; + +static ssize_t sector_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + + return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf); +} + +static ssize_t sector_size_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize, + btt_lbasize_supported); + dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, + rc, buf, buf[len - 1] == '\n' ? "" : "\n"); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc ? rc : len; +} +static DEVICE_ATTR_RW(sector_size); + +static ssize_t uuid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + + if (nd_btt->uuid) + return sprintf(buf, "%pUb\n", nd_btt->uuid); + return sprintf(buf, "\n"); +} + +static ssize_t uuid_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + device_lock(dev); + rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len); + dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, + rc, buf, buf[len - 1] == '\n' ? "" : "\n"); + device_unlock(dev); + + return rc ? rc : len; +} +static DEVICE_ATTR_RW(uuid); + +static ssize_t namespace_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + nvdimm_bus_lock(dev); + rc = sprintf(buf, "%s\n", nd_btt->ndns + ? dev_name(&nd_btt->ndns->dev) : ""); + nvdimm_bus_unlock(dev); + return rc; +} + +static ssize_t namespace_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_btt *nd_btt = to_nd_btt(dev); + ssize_t rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len); + dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, + rc, buf, buf[len - 1] == '\n' ? "" : "\n"); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RW(namespace); + +static struct attribute *nd_btt_attributes[] = { + &dev_attr_sector_size.attr, + &dev_attr_namespace.attr, + &dev_attr_uuid.attr, + NULL, +}; + +static struct attribute_group nd_btt_attribute_group = { + .attrs = nd_btt_attributes, +}; + +static const struct attribute_group *nd_btt_attribute_groups[] = { + &nd_btt_attribute_group, + &nd_device_attribute_group, + &nd_numa_attribute_group, + NULL, +}; + +static struct device *__nd_btt_create(struct nd_region *nd_region, + unsigned long lbasize, u8 *uuid, + struct nd_namespace_common *ndns) +{ + struct nd_btt *nd_btt; + struct device *dev; + + nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL); + if (!nd_btt) + return NULL; + + nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL); + if (nd_btt->id < 0) { + kfree(nd_btt); + return NULL; + } + + nd_btt->lbasize = lbasize; + if (uuid) + uuid = kmemdup(uuid, 16, GFP_KERNEL); + nd_btt->uuid = uuid; + dev = &nd_btt->dev; + dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id); + dev->parent = &nd_region->dev; + dev->type = &nd_btt_device_type; + dev->groups = nd_btt_attribute_groups; + device_initialize(&nd_btt->dev); + if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) { + dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n", + __func__, dev_name(ndns->claim)); + put_device(dev); + return NULL; + } + return dev; +} + +struct device *nd_btt_create(struct nd_region *nd_region) +{ + struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL); + + if (dev) + __nd_device_register(dev); + return dev; +} + +static bool uuid_is_null(u8 *uuid) +{ + static const u8 null_uuid[16]; + + return (memcmp(uuid, null_uuid, 16) == 0); +} + +/** + * nd_btt_arena_is_valid - check if the metadata layout is valid + * @nd_btt: device with BTT geometry and backing device info + * @super: pointer to the arena's info block being tested + * + * Check consistency of the btt info block with itself by validating + * the checksum, and with the parent namespace by verifying the + * parent_uuid contained in the info block with the one supplied in. + * + * Returns: + * false for an invalid info block, true for a valid one + */ +bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) +{ + const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); + u64 checksum; + + if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0) + return false; + + if (!uuid_is_null(super->parent_uuid)) + if (memcmp(super->parent_uuid, parent_uuid, 16) != 0) + return false; + + checksum = le64_to_cpu(super->checksum); + super->checksum = 0; + if (checksum != nd_sb_checksum((struct nd_gen_sb *) super)) + return false; + super->checksum = cpu_to_le64(checksum); + + /* TODO: figure out action for this */ + if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0) + dev_info(&nd_btt->dev, "Found arena with an error flag\n"); + + return true; +} +EXPORT_SYMBOL(nd_btt_arena_is_valid); + +static int __nd_btt_probe(struct nd_btt *nd_btt, + struct nd_namespace_common *ndns, struct btt_sb *btt_sb) +{ + if (!btt_sb || !ndns || !nd_btt) + return -ENODEV; + + if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb))) + return -ENXIO; + + if (nvdimm_namespace_capacity(ndns) < SZ_16M) + return -ENXIO; + + if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) + return -ENODEV; + + nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize); + nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL); + if (!nd_btt->uuid) + return -ENOMEM; + + __nd_device_register(&nd_btt->dev); + + return 0; +} + +int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata) +{ + int rc; + struct device *dev; + struct btt_sb *btt_sb; + struct nd_region *nd_region = to_nd_region(ndns->dev.parent); + + if (ndns->force_raw) + return -ENODEV; + + nvdimm_bus_lock(&ndns->dev); + dev = __nd_btt_create(nd_region, 0, NULL, ndns); + nvdimm_bus_unlock(&ndns->dev); + if (!dev) + return -ENOMEM; + dev_set_drvdata(dev, drvdata); + btt_sb = kzalloc(sizeof(*btt_sb), GFP_KERNEL); + rc = __nd_btt_probe(to_nd_btt(dev), ndns, btt_sb); + kfree(btt_sb); + dev_dbg(&ndns->dev, "%s: btt: %s\n", __func__, + rc == 0 ? dev_name(dev) : ""); + if (rc < 0) { + struct nd_btt *nd_btt = to_nd_btt(dev); + + __nd_detach_ndns(dev, &nd_btt->ndns); + put_device(dev); + } + + return rc; +} +EXPORT_SYMBOL(nd_btt_probe);