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 <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 07a2911..5680e8e 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -33,4 +33,7 @@
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 abce98f..6085b4b 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -11,3 +11,4 @@
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 0000000..e8f6d8e
--- /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 <linux/types.h>
+
+#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 0000000..effb70a8
--- /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 <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/genhd.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#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) : "<none>");
+ 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 ca80270..dd12f38 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -14,8 +14,10 @@
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/module.h>
+#include <linux/blkdev.h>
#include <linux/fcntl.h>
#include <linux/async.h>
+#include <linux/genhd.h>
#include <linux/ndctl.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -103,6 +105,7 @@
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 @@
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 3414800..96526dc 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -666,7 +666,7 @@
/* 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 @@
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 50b502b..2c50a07 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -102,7 +102,7 @@
} 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 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 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 @@
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 @@
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 @@
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 @@
{
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 @@
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 @@
{
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 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 @@
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 @@
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 @@
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 @@
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 @@
return devs;
err:
- namespace_pmem_release(&nspm->nsio.dev);
+ namespace_pmem_release(&nspm->nsio.common.dev);
return NULL;
}
@@ -1385,7 +1509,7 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 78d6c51..5e64139 100644
--- a/drivers/nvdimm/nd-core.h
+++ b/drivers/nvdimm/nd-core.h
@@ -45,12 +45,14 @@
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 @@
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 @@
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 bfa8496..d13eccb 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -19,6 +19,10 @@
#include <linux/types.h>
#include "label.h"
+enum {
+ SECTOR_SHIFT = 9,
+};
+
struct nvdimm_drvdata {
struct device *dev;
int nsindex_size;
@@ -74,7 +78,9 @@
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 @@
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_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 @@
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 90902a1..d0c6b4b 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -121,44 +121,61 @@
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 @@
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 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);
+ ndns = nvdimm_namespace_common_probe(dev);
+ if (IS_ERR(ndns))
+ return PTR_ERR(ndns);
- 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;
- }
- }
-
+ 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 9aba44e..2a5f3f5 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -33,12 +33,13 @@
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 @@
/* 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 ac21ce4..4fd9238 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -296,10 +296,28 @@
}
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 @@
/*
* 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 @@
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 @@
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 23276ea..507e47c 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -12,6 +12,7 @@
*/
#ifndef __LINUX_ND_H__
#define __LINUX_ND_H__
+#include <linux/fs.h>
#include <linux/ndctl.h>
#include <linux/device.h>
@@ -29,12 +30,32 @@
};
/**
+ * 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_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 @@
* @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 @@
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_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) \