From 8c2f7e8658df1d3b7cbfa62706941d14c715823a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 25 Jun 2015 04:20:04 -0400 Subject: [PATCH] libnvdimm: infrastructure for btt devices NVDIMM namespaces, in addition to accepting "struct bio" based requests, also have the capability to perform byte-aligned accesses. By default only the bio/block interface is used. However, if another driver can make effective use of the byte-aligned capability it can claim namespace interface and use the byte-aligned ->rw_bytes() interface. The BTT driver is the initial first consumer of this mechanism to allow adding atomic sector update semantics to a pmem or blk namespace. This patch is the sysfs infrastructure to allow configuring a BTT instance for a namespace. Enabling that BTT and performing i/o is in a subsequent patch. Cc: Greg KH Cc: Neil Brown Signed-off-by: Dan Williams --- drivers/nvdimm/Kconfig | 3 + drivers/nvdimm/Makefile | 1 + drivers/nvdimm/btt.h | 45 ++++ drivers/nvdimm/btt_devs.c | 422 ++++++++++++++++++++++++++++++++ drivers/nvdimm/bus.c | 12 +- drivers/nvdimm/label.c | 5 +- drivers/nvdimm/namespace_devs.c | 204 ++++++++++++--- drivers/nvdimm/nd-core.h | 4 + drivers/nvdimm/nd.h | 40 +++ drivers/nvdimm/pmem.c | 132 ++++++---- drivers/nvdimm/region.c | 8 +- drivers/nvdimm/region_devs.c | 39 ++- include/linux/nd.h | 63 ++++- 13 files changed, 879 insertions(+), 99 deletions(-) create mode 100644 drivers/nvdimm/btt.h create mode 100644 drivers/nvdimm/btt_devs.c diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig index 07a29113b870..5680e8e7a7aa 100644 --- a/drivers/nvdimm/Kconfig +++ b/drivers/nvdimm/Kconfig @@ -33,4 +33,7 @@ config BLK_DEV_PMEM Say Y if you want to use an NVDIMM +config BTT + def_bool y + endif diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile index abce98f87f16..6085b4bd7312 100644 --- a/drivers/nvdimm/Makefile +++ b/drivers/nvdimm/Makefile @@ -11,3 +11,4 @@ libnvdimm-y += region_devs.o libnvdimm-y += region.o libnvdimm-y += namespace_devs.o libnvdimm-y += label.o +libnvdimm-$(CONFIG_BTT) += btt_devs.o diff --git a/drivers/nvdimm/btt.h b/drivers/nvdimm/btt.h new file mode 100644 index 000000000000..e8f6d8e0ddd3 --- /dev/null +++ b/drivers/nvdimm/btt.h @@ -0,0 +1,45 @@ +/* + * Block Translation Table library + * Copyright (c) 2014-2015, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ + +#ifndef _LINUX_BTT_H +#define _LINUX_BTT_H + +#include + +#define BTT_SIG_LEN 16 +#define BTT_SIG "BTT_ARENA_INFO\0" + +struct btt_sb { + u8 signature[BTT_SIG_LEN]; + u8 uuid[16]; + u8 parent_uuid[16]; + __le32 flags; + __le16 version_major; + __le16 version_minor; + __le32 external_lbasize; + __le32 external_nlba; + __le32 internal_lbasize; + __le32 internal_nlba; + __le32 nfree; + __le32 infosize; + __le64 nextoff; + __le64 dataoff; + __le64 mapoff; + __le64 logoff; + __le64 info2off; + u8 padding[3968]; + __le64 checksum; +}; + +#endif diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c new file mode 100644 index 000000000000..effb70a88347 --- /dev/null +++ b/drivers/nvdimm/btt_devs.c @@ -0,0 +1,422 @@ +/* + * 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_detach_ndns(struct nd_btt *nd_btt) +{ + struct nd_namespace_common *ndns = nd_btt->ndns; + + dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex) + || ndns->claim != &nd_btt->dev, + "%s: invalid claim\n", __func__); + ndns->claim = NULL; + nd_btt->ndns = NULL; + put_device(&ndns->dev); +} + +static void nd_btt_detach_ndns(struct nd_btt *nd_btt) +{ + struct nd_namespace_common *ndns = nd_btt->ndns; + + if (!ndns) + return; + get_device(&ndns->dev); + device_lock(&ndns->dev); + __nd_btt_detach_ndns(nd_btt); + device_unlock(&ndns->dev); + put_device(&ndns->dev); +} + +static bool __nd_btt_attach_ndns(struct nd_btt *nd_btt, + struct nd_namespace_common *ndns) +{ + if (ndns->claim) + return false; + dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex) + || nd_btt->ndns, + "%s: invalid claim\n", __func__); + ndns->claim = &nd_btt->dev; + nd_btt->ndns = ndns; + get_device(&ndns->dev); + return true; +} + +static bool nd_btt_attach_ndns(struct nd_btt *nd_btt, + struct nd_namespace_common *ndns) +{ + bool claimed; + + device_lock(&ndns->dev); + claimed = __nd_btt_attach_ndns(nd_btt, ndns); + device_unlock(&ndns->dev); + return claimed; +} + +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_btt_detach_ndns(nd_btt); + 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, 4096, 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 int namespace_match(struct device *dev, void *data) +{ + char *name = data; + + return strcmp(name, dev_name(dev)) == 0; +} + +static bool is_nd_btt_idle(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_btt *nd_btt = to_nd_btt(dev); + + if (nd_region->btt_seed == dev || nd_btt->ndns || dev->driver) + return false; + return true; +} + +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); + struct nd_namespace_common *ndns; + struct device *found; + char *name; + + if (dev->driver) { + dev_dbg(dev, "%s: -EBUSY\n", __func__); + return -EBUSY; + } + + name = kstrndup(buf, len, GFP_KERNEL); + if (!name) + return -ENOMEM; + strim(name); + + if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0) + /* pass */; + else { + len = -EINVAL; + goto out; + } + + ndns = nd_btt->ndns; + if (strcmp(name, "") == 0) { + /* detach the namespace and destroy / reset the btt device */ + nd_btt_detach_ndns(nd_btt); + if (is_nd_btt_idle(dev)) + nd_device_unregister(dev, ND_ASYNC); + else { + nd_btt->lbasize = 0; + kfree(nd_btt->uuid); + nd_btt->uuid = NULL; + } + goto out; + } else if (ndns) { + dev_dbg(dev, "namespace already set to: %s\n", + dev_name(&ndns->dev)); + len = -EBUSY; + goto out; + } + + found = device_find_child(dev->parent, name, namespace_match); + if (!found) { + dev_dbg(dev, "'%s' not found under %s\n", name, + dev_name(dev->parent)); + len = -ENODEV; + goto out; + } + + ndns = to_ndns(found); + if (__nvdimm_namespace_capacity(ndns) < SZ_16M) { + dev_dbg(dev, "%s too small to host btt\n", name); + len = -ENXIO; + goto out_attach; + } + + WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev)); + if (!nd_btt_attach_ndns(nd_btt, ndns)) { + dev_dbg(dev, "%s already claimed\n", + dev_name(&ndns->dev)); + len = -EBUSY; + } + + out_attach: + put_device(&ndns->dev); /* from device_find_child */ + out: + kfree(name); + return len; +} + +static ssize_t namespace_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + ssize_t rc; + + nvdimm_bus_lock(dev); + device_lock(dev); + rc = __namespace_store(dev, attr, buf, len); + dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__, + rc, buf, buf[len - 1] == '\n' ? "" : "\n"); + device_unlock(dev); + nvdimm_bus_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, + 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_btt_attach_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; +} + +/* + * nd_btt_sb_checksum: compute checksum for btt info block + * + * Returns a fletcher64 checksum of everything in the given info block + * except the last field (since that's where the checksum lives). + */ +u64 nd_btt_sb_checksum(struct btt_sb *btt_sb) +{ + u64 sum, sum_save; + + sum_save = btt_sb->checksum; + btt_sb->checksum = 0; + sum = nd_fletcher64(btt_sb, sizeof(*btt_sb), 1); + btt_sb->checksum = sum_save; + return sum; +} +EXPORT_SYMBOL(nd_btt_sb_checksum); + +static int __nd_btt_probe(struct nd_btt *nd_btt, + struct nd_namespace_common *ndns, struct btt_sb *btt_sb) +{ + u64 checksum; + + 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 (memcmp(btt_sb->signature, BTT_SIG, BTT_SIG_LEN) != 0) + return -ENODEV; + + checksum = le64_to_cpu(btt_sb->checksum); + btt_sb->checksum = 0; + if (checksum != nd_btt_sb_checksum(btt_sb)) + return -ENODEV; + btt_sb->checksum = cpu_to_le64(checksum); + + 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) { + __nd_btt_detach_ndns(to_nd_btt(dev)); + put_device(dev); + } + + return rc; +} +EXPORT_SYMBOL(nd_btt_probe); diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c index ca802702440e..dd12f38397db 100644 --- a/drivers/nvdimm/bus.c +++ b/drivers/nvdimm/bus.c @@ -14,8 +14,10 @@ #include #include #include +#include #include #include +#include #include #include #include @@ -103,6 +105,7 @@ static int nvdimm_bus_probe(struct device *dev) dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, dev_name(dev), rc); + if (rc != 0) module_put(provider); return rc; @@ -163,14 +166,19 @@ static void nd_async_device_unregister(void *d, async_cookie_t cookie) put_device(dev); } -void nd_device_register(struct device *dev) +void __nd_device_register(struct device *dev) { dev->bus = &nvdimm_bus_type; - device_initialize(dev); get_device(dev); async_schedule_domain(nd_async_device_register, dev, &nd_async_domain); } + +void nd_device_register(struct device *dev) +{ + device_initialize(dev); + __nd_device_register(dev); +} EXPORT_SYMBOL(nd_device_register); void nd_device_unregister(struct device *dev, enum nd_async_mode mode) diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index 34148003fc73..96526dcfdd37 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -666,7 +666,7 @@ static int __blk_label_update(struct nd_region *nd_region, /* don't allow updates that consume the last label */ if (nfree - alloc < 0 || nfree - alloc + victims < 1) { - dev_info(&nsblk->dev, "insufficient label space\n"); + dev_info(&nsblk->common.dev, "insufficient label space\n"); kfree(victim_map); return -ENOSPC; } @@ -762,7 +762,8 @@ static int __blk_label_update(struct nd_region *nd_region, continue; res = to_resource(ndd, nd_label); res->flags &= ~DPA_RESOURCE_ADJUSTED; - dev_vdbg(&nsblk->dev, "assign label[%d] slot: %d\n", l, slot); + dev_vdbg(&nsblk->common.dev, "assign label[%d] slot: %d\n", + l, slot); nd_mapping->labels[l++] = nd_label; } nd_mapping->labels[l] = NULL; diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 50b502b1908e..2c50a0719f8d 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -102,7 +102,7 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf, } else return -ENXIO; - if (dev->driver) + if (dev->driver || to_ndns(dev)->claim) return -EBUSY; input = kmemdup(buf, len + 1, GFP_KERNEL); @@ -133,7 +133,7 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf, static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk) { - struct nd_region *nd_region = to_nd_region(nsblk->dev.parent); + struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent); struct nd_mapping *nd_mapping = &nd_region->mapping[0]; struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); struct nd_label_id label_id; @@ -152,9 +152,9 @@ static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk) static int nd_namespace_label_update(struct nd_region *nd_region, struct device *dev) { - dev_WARN_ONCE(dev, dev->driver, + dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim, "namespace must be idle during label update\n"); - if (dev->driver) + if (dev->driver || to_ndns(dev)->claim) return 0; /* @@ -666,7 +666,7 @@ static ssize_t __size_store(struct device *dev, unsigned long long val) u8 *uuid = NULL; int rc, i; - if (dev->driver) + if (dev->driver || to_ndns(dev)->claim) return -EBUSY; if (is_namespace_pmem(dev)) { @@ -733,12 +733,16 @@ static ssize_t __size_store(struct device *dev, unsigned long long val) nd_namespace_pmem_set_size(nd_region, nspm, val * nd_region->ndr_mappings); } else if (is_namespace_blk(dev)) { + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + /* * Try to delete the namespace if we deleted all of its - * allocation and this is not the seed device for the - * region. + * allocation, this is not the seed device for the + * region, and it is not actively claimed by a btt + * instance. */ - if (val == 0 && nd_region->ns_seed != dev) + if (val == 0 && nd_region->ns_seed != dev + && !nsblk->common.claim) nd_device_unregister(dev, ND_ASYNC); } @@ -789,26 +793,42 @@ static ssize_t size_store(struct device *dev, return rc < 0 ? rc : len; } -static ssize_t size_show(struct device *dev, - struct device_attribute *attr, char *buf) +resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns) { - unsigned long long size = 0; + struct device *dev = &ndns->dev; - nvdimm_bus_lock(dev); if (is_namespace_pmem(dev)) { struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); - size = resource_size(&nspm->nsio.res); + return resource_size(&nspm->nsio.res); } else if (is_namespace_blk(dev)) { - size = nd_namespace_blk_size(to_nd_namespace_blk(dev)); + return nd_namespace_blk_size(to_nd_namespace_blk(dev)); } else if (is_namespace_io(dev)) { struct nd_namespace_io *nsio = to_nd_namespace_io(dev); - size = resource_size(&nsio->res); - } - nvdimm_bus_unlock(dev); + return resource_size(&nsio->res); + } else + WARN_ONCE(1, "unknown namespace type\n"); + return 0; +} - return sprintf(buf, "%llu\n", size); +resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns) +{ + resource_size_t size; + + nvdimm_bus_lock(&ndns->dev); + size = __nvdimm_namespace_capacity(ndns); + nvdimm_bus_unlock(&ndns->dev); + + return size; +} +EXPORT_SYMBOL(nvdimm_namespace_capacity); + +static ssize_t size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%llu\n", (unsigned long long) + nvdimm_namespace_capacity(to_ndns(dev))); } static DEVICE_ATTR(size, S_IRUGO, size_show, size_store); @@ -897,8 +917,8 @@ static ssize_t uuid_store(struct device *dev, { struct nd_region *nd_region = to_nd_region(dev->parent); u8 *uuid = NULL; + ssize_t rc = 0; u8 **ns_uuid; - ssize_t rc; if (is_namespace_pmem(dev)) { struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); @@ -914,7 +934,10 @@ static ssize_t uuid_store(struct device *dev, device_lock(dev); nvdimm_bus_lock(dev); wait_nvdimm_bus_probe_idle(dev); - rc = nd_uuid_store(dev, &uuid, buf, len); + if (to_ndns(dev)->claim) + rc = -EBUSY; + if (rc >= 0) + rc = nd_uuid_store(dev, &uuid, buf, len); if (rc >= 0) rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid); if (rc >= 0) @@ -971,15 +994,18 @@ static ssize_t sector_size_store(struct device *dev, { struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); struct nd_region *nd_region = to_nd_region(dev->parent); - ssize_t rc; + ssize_t rc = 0; if (!is_namespace_blk(dev)) return -ENXIO; device_lock(dev); nvdimm_bus_lock(dev); - rc = nd_sector_size_store(dev, buf, &nsblk->lbasize, - ns_lbasize_supported); + if (to_ndns(dev)->claim) + rc = -EBUSY; + if (rc >= 0) + rc = nd_sector_size_store(dev, buf, &nsblk->lbasize, + ns_lbasize_supported); if (rc >= 0) rc = nd_namespace_label_update(nd_region, dev); dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__, @@ -1034,12 +1060,48 @@ static ssize_t dpa_extents_show(struct device *dev, } static DEVICE_ATTR_RO(dpa_extents); +static ssize_t holder_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_namespace_common *ndns = to_ndns(dev); + ssize_t rc; + + device_lock(dev); + rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : ""); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(holder); + +static ssize_t force_raw_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + bool force_raw; + int rc = strtobool(buf, &force_raw); + + if (rc) + return rc; + + to_ndns(dev)->force_raw = force_raw; + return len; +} + +static ssize_t force_raw_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", to_ndns(dev)->force_raw); +} +static DEVICE_ATTR_RW(force_raw); + static struct attribute *nd_namespace_attributes[] = { &dev_attr_nstype.attr, &dev_attr_size.attr, &dev_attr_uuid.attr, + &dev_attr_holder.attr, &dev_attr_resource.attr, &dev_attr_alt_name.attr, + &dev_attr_force_raw.attr, &dev_attr_sector_size.attr, &dev_attr_dpa_extents.attr, NULL, @@ -1066,7 +1128,9 @@ static umode_t namespace_visible(struct kobject *kobj, return a->mode; } - if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr) + if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr + || a == &dev_attr_holder.attr + || a == &dev_attr_force_raw.attr) return a->mode; return 0; @@ -1083,6 +1147,66 @@ static const struct attribute_group *nd_namespace_attribute_groups[] = { NULL, }; +struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev) +{ + struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; + struct nd_namespace_common *ndns; + resource_size_t size; + + if (nd_btt) { + ndns = nd_btt->ndns; + if (!ndns) + return ERR_PTR(-ENODEV); + + /* + * Flush any in-progess probes / removals in the driver + * for the raw personality of this namespace. + */ + device_lock(&ndns->dev); + device_unlock(&ndns->dev); + if (ndns->dev.driver) { + dev_dbg(&ndns->dev, "is active, can't bind %s\n", + dev_name(&nd_btt->dev)); + return ERR_PTR(-EBUSY); + } + if (dev_WARN_ONCE(&ndns->dev, ndns->claim != &nd_btt->dev, + "host (%s) vs claim (%s) mismatch\n", + dev_name(&nd_btt->dev), + dev_name(ndns->claim))) + return ERR_PTR(-ENXIO); + } else { + ndns = to_ndns(dev); + if (ndns->claim) { + dev_dbg(dev, "claimed by %s, failing probe\n", + dev_name(ndns->claim)); + + return ERR_PTR(-ENXIO); + } + } + + size = nvdimm_namespace_capacity(ndns); + if (size < ND_MIN_NAMESPACE_SIZE) { + dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n", + &size, ND_MIN_NAMESPACE_SIZE); + return ERR_PTR(-ENODEV); + } + + if (is_namespace_pmem(&ndns->dev)) { + struct nd_namespace_pmem *nspm; + + nspm = to_nd_namespace_pmem(&ndns->dev); + if (!nspm->uuid) { + dev_dbg(&ndns->dev, "%s: uuid not set\n", __func__); + return ERR_PTR(-ENODEV); + } + } else if (is_namespace_blk(&ndns->dev)) { + return ERR_PTR(-ENODEV); /* TODO */ + } + + return ndns; +} +EXPORT_SYMBOL(nvdimm_namespace_common_probe); + static struct device **create_namespace_io(struct nd_region *nd_region) { struct nd_namespace_io *nsio; @@ -1099,7 +1223,7 @@ static struct device **create_namespace_io(struct nd_region *nd_region) return NULL; } - dev = &nsio->dev; + dev = &nsio->common.dev; dev->type = &namespace_io_device_type; dev->parent = &nd_region->dev; res = &nsio->res; @@ -1313,7 +1437,7 @@ static struct device **create_namespace_pmem(struct nd_region *nd_region) if (!nspm) return NULL; - dev = &nspm->nsio.dev; + dev = &nspm->nsio.common.dev; dev->type = &namespace_pmem_device_type; dev->parent = &nd_region->dev; res = &nspm->nsio.res; @@ -1346,7 +1470,7 @@ static struct device **create_namespace_pmem(struct nd_region *nd_region) return devs; err: - namespace_pmem_release(&nspm->nsio.dev); + namespace_pmem_release(&nspm->nsio.common.dev); return NULL; } @@ -1385,7 +1509,7 @@ static struct device *nd_namespace_blk_create(struct nd_region *nd_region) if (!nsblk) return NULL; - dev = &nsblk->dev; + dev = &nsblk->common.dev; dev->type = &namespace_blk_device_type; nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL); if (nsblk->id < 0) { @@ -1396,7 +1520,7 @@ static struct device *nd_namespace_blk_create(struct nd_region *nd_region) dev->parent = &nd_region->dev; dev->groups = nd_namespace_attribute_groups; - return &nsblk->dev; + return &nsblk->common.dev; } void nd_region_create_blk_seed(struct nd_region *nd_region) @@ -1413,6 +1537,18 @@ void nd_region_create_blk_seed(struct nd_region *nd_region) nd_device_register(nd_region->ns_seed); } +void nd_region_create_btt_seed(struct nd_region *nd_region) +{ + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + nd_region->btt_seed = nd_btt_create(nd_region); + /* + * Seed creation failures are not fatal, provisioning is simply + * disabled until memory becomes available + */ + if (!nd_region->btt_seed) + dev_err(&nd_region->dev, "failed to create btt namespace\n"); +} + static struct device **create_namespace_blk(struct nd_region *nd_region) { struct nd_mapping *nd_mapping = &nd_region->mapping[0]; @@ -1446,7 +1582,7 @@ static struct device **create_namespace_blk(struct nd_region *nd_region) if (!res) goto err; nd_dbg_dpa(nd_region, ndd, res, "%s assign\n", - dev_name(&nsblk->dev)); + dev_name(&nsblk->common.dev)); break; } } @@ -1462,7 +1598,7 @@ static struct device **create_namespace_blk(struct nd_region *nd_region) nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL); if (!nsblk) goto err; - dev = &nsblk->dev; + dev = &nsblk->common.dev; dev->type = &namespace_blk_device_type; dev->parent = &nd_region->dev; dev_set_name(dev, "namespace%d.%d", nd_region->id, count); @@ -1482,7 +1618,7 @@ static struct device **create_namespace_blk(struct nd_region *nd_region) if (!res) goto err; nd_dbg_dpa(nd_region, ndd, res, "%s assign\n", - dev_name(&nsblk->dev)); + dev_name(&nsblk->common.dev)); } dev_dbg(&nd_region->dev, "%s: discovered %d blk namespace%s\n", @@ -1503,7 +1639,7 @@ static struct device **create_namespace_blk(struct nd_region *nd_region) nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL); if (!nsblk) goto err; - dev = &nsblk->dev; + dev = &nsblk->common.dev; dev->type = &namespace_blk_device_type; dev->parent = &nd_region->dev; devs[count++] = dev; @@ -1514,7 +1650,7 @@ static struct device **create_namespace_blk(struct nd_region *nd_region) err: for (i = 0; i < count; i++) { nsblk = to_nd_namespace_blk(devs[i]); - namespace_blk_release(&nsblk->dev); + namespace_blk_release(&nsblk->common.dev); } kfree(devs); return NULL; diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h index 78d6c51f4bac..5e6413964776 100644 --- a/drivers/nvdimm/nd-core.h +++ b/drivers/nvdimm/nd-core.h @@ -45,12 +45,14 @@ struct nvdimm { bool is_nvdimm(struct device *dev); bool is_nd_blk(struct device *dev); bool is_nd_pmem(struct device *dev); +struct nd_btt; struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev); int __init nvdimm_bus_init(void); void nvdimm_bus_exit(void); void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev); struct nd_region; void nd_region_create_blk_seed(struct nd_region *nd_region); +void nd_region_create_btt_seed(struct nd_region *nd_region); void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev); int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus); void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus); @@ -58,6 +60,7 @@ void nd_synchronize(void); int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus); int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus); int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus); +void __nd_device_register(struct device *dev); int nd_match_dimm(struct device *dev, void *data); struct nd_label_id; char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags); @@ -77,4 +80,5 @@ struct resource *nsblk_add_resource(struct nd_region *nd_region, resource_size_t start); int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd); void get_ndd(struct nvdimm_drvdata *ndd); +resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns); #endif /* __ND_CORE_H__ */ diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index bfa849617358..d13eccbb67e9 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -19,6 +19,10 @@ #include #include "label.h" +enum { + SECTOR_SHIFT = 9, +}; + struct nvdimm_drvdata { struct device *dev; int nsindex_size; @@ -74,7 +78,9 @@ static inline struct nd_namespace_index *to_next_namespace_index( struct nd_region { struct device dev; struct ida ns_ida; + struct ida btt_ida; struct device *ns_seed; + struct device *btt_seed; u16 ndr_mappings; u64 ndr_size; u64 ndr_start; @@ -94,6 +100,14 @@ static inline unsigned nd_inc_seq(unsigned seq) return next[seq & 3]; } +struct nd_btt { + struct device dev; + struct nd_namespace_common *ndns; + unsigned long lbasize; + u8 *uuid; + int id; +}; + enum nd_async_mode { ND_SYNC, ND_ASYNC, @@ -118,6 +132,30 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd); int nvdimm_init_config_data(struct nvdimm_drvdata *ndd); int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, void *buf, size_t len); +struct nd_btt *to_nd_btt(struct device *dev); +struct btt_sb; +u64 nd_btt_sb_checksum(struct btt_sb *btt_sb); +#if IS_ENABLED(CONFIG_BTT) +int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata); +bool is_nd_btt(struct device *dev); +struct device *nd_btt_create(struct nd_region *nd_region); +#else +static inline nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata) +{ + return -ENODEV; +} + +static inline bool is_nd_btt(struct device *dev) +{ + return false; +} + +static inline struct device *nd_btt_create(struct nd_region *nd_region) +{ + return NULL; +} + +#endif struct nd_region *to_nd_region(struct device *dev); int nd_region_to_nstype(struct nd_region *nd_region); int nd_region_register_namespaces(struct nd_region *nd_region, int *err); @@ -132,4 +170,6 @@ void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res); struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, struct nd_label_id *label_id, resource_size_t start, resource_size_t n); +resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns); +struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev); #endif /* __ND_H__ */ diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 90902a142e35..d0c6b4bdba69 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -121,44 +121,61 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res, int id) { struct pmem_device *pmem; - struct gendisk *disk; - int err; - err = -ENOMEM; pmem = kzalloc(sizeof(*pmem), GFP_KERNEL); if (!pmem) - goto out; + return ERR_PTR(-ENOMEM); pmem->phys_addr = res->start; pmem->size = resource_size(res); - err = -EINVAL; - if (!request_mem_region(pmem->phys_addr, pmem->size, "pmem")) { + if (!request_mem_region(pmem->phys_addr, pmem->size, dev_name(dev))) { dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", &pmem->phys_addr, pmem->size); - goto out_free_dev; + kfree(pmem); + return ERR_PTR(-EBUSY); } /* * Map the memory as non-cachable, as we can't write back the contents * of the CPU caches in case of a crash. */ - err = -ENOMEM; pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); - if (!pmem->virt_addr) - goto out_release_region; + if (!pmem->virt_addr) { + release_mem_region(pmem->phys_addr, pmem->size); + kfree(pmem); + return ERR_PTR(-ENXIO); + } + + return pmem; +} + +static void pmem_detach_disk(struct pmem_device *pmem) +{ + del_gendisk(pmem->pmem_disk); + put_disk(pmem->pmem_disk); + blk_cleanup_queue(pmem->pmem_queue); +} + +static int pmem_attach_disk(struct nd_namespace_common *ndns, + struct pmem_device *pmem) +{ + struct nd_region *nd_region = to_nd_region(ndns->dev.parent); + struct gendisk *disk; pmem->pmem_queue = blk_alloc_queue(GFP_KERNEL); if (!pmem->pmem_queue) - goto out_unmap; + return -ENOMEM; blk_queue_make_request(pmem->pmem_queue, pmem_make_request); blk_queue_max_hw_sectors(pmem->pmem_queue, 1024); blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY); disk = alloc_disk(0); - if (!disk) - goto out_free_queue; + if (!disk) { + blk_cleanup_queue(pmem->pmem_queue); + return -ENOMEM; + } disk->major = pmem_major; disk->first_minor = 0; @@ -166,32 +183,47 @@ static struct pmem_device *pmem_alloc(struct device *dev, disk->private_data = pmem; disk->queue = pmem->pmem_queue; disk->flags = GENHD_FL_EXT_DEVT; - sprintf(disk->disk_name, "pmem%d", id); - disk->driverfs_dev = dev; + sprintf(disk->disk_name, "pmem%d", nd_region->id); + disk->driverfs_dev = &ndns->dev; set_capacity(disk, pmem->size >> 9); pmem->pmem_disk = disk; add_disk(disk); - return pmem; + return 0; +} -out_free_queue: - blk_cleanup_queue(pmem->pmem_queue); -out_unmap: - iounmap(pmem->virt_addr); -out_release_region: - release_mem_region(pmem->phys_addr, pmem->size); -out_free_dev: - kfree(pmem); -out: - return ERR_PTR(err); +static int pmem_rw_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size, int rw) +{ + struct pmem_device *pmem = dev_get_drvdata(ndns->claim); + + if (unlikely(offset + size > pmem->size)) { + dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); + return -EFAULT; + } + + if (rw == READ) + memcpy(buf, pmem->virt_addr + offset, size); + else + memcpy(pmem->virt_addr + offset, buf, size); + + return 0; +} + +static int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns) +{ + /* TODO */ + return -ENXIO; +} + +static void nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns) +{ + /* TODO */ } static void pmem_free(struct pmem_device *pmem) { - del_gendisk(pmem->pmem_disk); - put_disk(pmem->pmem_disk); - blk_cleanup_queue(pmem->pmem_queue); iounmap(pmem->virt_addr); release_mem_region(pmem->phys_addr, pmem->size); kfree(pmem); @@ -200,40 +232,44 @@ static void pmem_free(struct pmem_device *pmem) static int nd_pmem_probe(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); - struct nd_namespace_io *nsio = to_nd_namespace_io(dev); + struct nd_namespace_common *ndns; + struct nd_namespace_io *nsio; struct pmem_device *pmem; + int rc; - if (resource_size(&nsio->res) < ND_MIN_NAMESPACE_SIZE) { - resource_size_t size = resource_size(&nsio->res); - - dev_dbg(dev, "%s: size: %pa, too small must be at least %#x\n", - __func__, &size, ND_MIN_NAMESPACE_SIZE); - return -ENODEV; - } - - if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_PMEM) { - struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); - - if (!nspm->uuid) { - dev_dbg(dev, "%s: uuid not set\n", __func__); - return -ENODEV; - } - } + ndns = nvdimm_namespace_common_probe(dev); + if (IS_ERR(ndns)) + return PTR_ERR(ndns); + nsio = to_nd_namespace_io(&ndns->dev); pmem = pmem_alloc(dev, &nsio->res, nd_region->id); if (IS_ERR(pmem)) return PTR_ERR(pmem); dev_set_drvdata(dev, pmem); - - return 0; + ndns->rw_bytes = pmem_rw_bytes; + if (is_nd_btt(dev)) + rc = nvdimm_namespace_attach_btt(ndns); + else if (nd_btt_probe(ndns, pmem) == 0) { + /* we'll come back as btt-pmem */ + rc = -ENXIO; + } else + rc = pmem_attach_disk(ndns, pmem); + if (rc) + pmem_free(pmem); + return rc; } static int nd_pmem_remove(struct device *dev) { struct pmem_device *pmem = dev_get_drvdata(dev); + if (is_nd_btt(dev)) + nvdimm_namespace_detach_btt(to_nd_btt(dev)->ndns); + else + pmem_detach_disk(pmem); pmem_free(pmem); + return 0; } diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index 9aba44e483e0..2a5f3f53d79d 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -33,12 +33,13 @@ static int nd_region_probe(struct device *dev) num_ns->count = rc + err; dev_set_drvdata(dev, num_ns); + if (rc && err && rc == err) + return -ENODEV; + + nd_region->btt_seed = nd_btt_create(nd_region); if (err == 0) return 0; - if (rc == err) - return -ENODEV; - /* * Given multiple namespaces per region, we do not want to * disable all the successfully registered peer namespaces upon @@ -66,6 +67,7 @@ static int nd_region_remove(struct device *dev) /* flush attribute readers and disable */ nvdimm_bus_lock(dev); nd_region->ns_seed = NULL; + nd_region->btt_seed = NULL; dev_set_drvdata(dev, NULL); nvdimm_bus_unlock(dev); diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index ac21ce419beb..4fd92389fa7e 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -296,10 +296,28 @@ static ssize_t namespace_seed_show(struct device *dev, } static DEVICE_ATTR_RO(namespace_seed); +static ssize_t btt_seed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + ssize_t rc; + + nvdimm_bus_lock(dev); + if (nd_region->btt_seed) + rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed)); + else + rc = sprintf(buf, "\n"); + nvdimm_bus_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(btt_seed); + static struct attribute *nd_region_attributes[] = { &dev_attr_size.attr, &dev_attr_nstype.attr, &dev_attr_mappings.attr, + &dev_attr_btt_seed.attr, &dev_attr_set_cookie.attr, &dev_attr_available_size.attr, &dev_attr_namespace_seed.attr, @@ -345,15 +363,18 @@ u64 nd_region_interleave_set_cookie(struct nd_region *nd_region) /* * Upon successful probe/remove, take/release a reference on the - * associated interleave set (if present) + * associated interleave set (if present), and plant new btt + namespace + * seeds. */ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, struct device *dev, bool probe) { + struct nd_region *nd_region; + if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) { - struct nd_region *nd_region = to_nd_region(dev); int i; + nd_region = to_nd_region(dev); for (i = 0; i < nd_region->ndr_mappings; i++) { struct nd_mapping *nd_mapping = &nd_region->mapping[i]; struct nvdimm_drvdata *ndd = nd_mapping->ndd; @@ -365,14 +386,21 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, nd_mapping->ndd = NULL; atomic_dec(&nvdimm->busy); } - } else if (dev->parent && is_nd_blk(dev->parent) && probe) { - struct nd_region *nd_region = to_nd_region(dev->parent); - + } + if (dev->parent && is_nd_blk(dev->parent) && probe) { + nd_region = to_nd_region(dev->parent); nvdimm_bus_lock(dev); if (nd_region->ns_seed == dev) nd_region_create_blk_seed(nd_region); nvdimm_bus_unlock(dev); } + if (is_nd_btt(dev) && probe) { + nd_region = to_nd_region(dev->parent); + nvdimm_bus_lock(dev); + if (nd_region->btt_seed == dev) + nd_region_create_btt_seed(nd_region); + nvdimm_bus_unlock(dev); + } } void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev) @@ -546,6 +574,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, nd_region->provider_data = ndr_desc->provider_data; nd_region->nd_set = ndr_desc->nd_set; ida_init(&nd_region->ns_ida); + ida_init(&nd_region->btt_ida); dev = &nd_region->dev; dev_set_name(dev, "region%d", nd_region->id); dev->parent = &nvdimm_bus->dev; diff --git a/include/linux/nd.h b/include/linux/nd.h index 23276ea91690..507e47c86737 100644 --- a/include/linux/nd.h +++ b/include/linux/nd.h @@ -12,6 +12,7 @@ */ #ifndef __LINUX_ND_H__ #define __LINUX_ND_H__ +#include #include #include @@ -28,13 +29,33 @@ static inline struct nd_device_driver *to_nd_device_driver( return container_of(drv, struct nd_device_driver, drv); }; +/** + * struct nd_namespace_common - core infrastructure of a namespace + * @force_raw: ignore other personalities for the namespace (e.g. btt) + * @dev: device model node + * @claim: when set a another personality has taken ownership of the namespace + * @rw_bytes: access the raw namespace capacity with byte-aligned transfers + */ +struct nd_namespace_common { + int force_raw; + struct device dev; + struct device *claim; + int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset, + void *buf, size_t size, int rw); +}; + +static inline struct nd_namespace_common *to_ndns(struct device *dev) +{ + return container_of(dev, struct nd_namespace_common, dev); +} + /** * struct nd_namespace_io - infrastructure for loading an nd_pmem instance * @dev: namespace device created by the nd region driver * @res: struct resource conversion of a NFIT SPA table */ struct nd_namespace_io { - struct device dev; + struct nd_namespace_common common; struct resource res; }; @@ -52,7 +73,6 @@ struct nd_namespace_pmem { /** * struct nd_namespace_blk - namespace for dimm-bounded persistent memory - * @dev: namespace device creation by the nd region driver * @alt_name: namespace name supplied in the dimm label * @uuid: namespace name supplied in the dimm label * @id: ida allocated id @@ -61,7 +81,7 @@ struct nd_namespace_pmem { * @res: discontiguous dpa extents for given dimm */ struct nd_namespace_blk { - struct device dev; + struct nd_namespace_common common; char *alt_name; u8 *uuid; int id; @@ -72,7 +92,7 @@ struct nd_namespace_blk { static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev) { - return container_of(dev, struct nd_namespace_io, dev); + return container_of(dev, struct nd_namespace_io, common.dev); } static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev) @@ -84,7 +104,40 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev) static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev) { - return container_of(dev, struct nd_namespace_blk, dev); + return container_of(dev, struct nd_namespace_blk, common.dev); +} + +/** + * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace + * @ndns: device to read + * @offset: namespace-relative starting offset + * @buf: buffer to fill + * @size: transfer length + * + * @buf is up-to-date upon return from this routine. + */ +static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size) +{ + return ndns->rw_bytes(ndns, offset, buf, size, READ); +} + +/** + * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace + * @ndns: device to read + * @offset: namespace-relative starting offset + * @buf: buffer to drain + * @size: transfer length + * + * NVDIMM Namepaces disks do not implement sectors internally. Depending on + * the @ndns, the contents of @buf may be in cpu cache, platform buffers, + * or on backing memory media upon return from this routine. Flushing + * to media is handled internal to the @ndns driver, if at all. + */ +static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size) +{ + return ndns->rw_bytes(ndns, offset, buf, size, WRITE); } #define MODULE_ALIAS_ND_DEVICE(type) \