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Subject[PATCH 14/21] nd: namespace indices: read and validate
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Date
On media label format consists of two index blocks followed by an array
of labels. None of these structures are ever updated in place. A
sequence number tracks the current active index and the next one to
write, while labels are written to free slots.

+------------+
| |
| nsindex0 |
| |
+------------+
| |
| nsindex1 |
| |
+------------+
| label0 |
+------------+
| label1 |
+------------+
| |
....nslot...
| |
+------------+
| labelN |
+------------+

After reading valid labels, store the dpa ranges they claim into
per-dimm resource trees.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/block/nd/Makefile | 1
drivers/block/nd/dimm.c | 25 +++-
drivers/block/nd/dimm_devs.c | 6 +
drivers/block/nd/label.c | 291 ++++++++++++++++++++++++++++++++++++++++++
drivers/block/nd/label.h | 129 +++++++++++++++++++
drivers/block/nd/nd.h | 45 ++++++
include/uapi/linux/ndctl.h | 1
7 files changed, 495 insertions(+), 3 deletions(-)
create mode 100644 drivers/block/nd/label.c
create mode 100644 drivers/block/nd/label.h

diff --git a/drivers/block/nd/Makefile b/drivers/block/nd/Makefile
index c0194d52e5ad..93856f1c9dbd 100644
--- a/drivers/block/nd/Makefile
+++ b/drivers/block/nd/Makefile
@@ -27,5 +27,6 @@ nd-y += dimm.o
nd-y += region_devs.o
nd-y += region.o
nd-y += namespace_devs.o
+nd-y += label.o

nd_pmem-y := pmem.o
diff --git a/drivers/block/nd/dimm.c b/drivers/block/nd/dimm.c
index 7e043c0c1bf5..ccc96d8fe2e7 100644
--- a/drivers/block/nd/dimm.c
+++ b/drivers/block/nd/dimm.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/nd.h>
+#include "label.h"
#include "nd.h"

static bool force_enable_dimms;
@@ -53,6 +54,12 @@ static int nd_dimm_probe(struct device *dev)
return -ENOMEM;

dev_set_drvdata(dev, ndd);
+ ndd->dpa.name = dev_name(dev);
+ ndd->ns_current = -1;
+ ndd->ns_next = -1;
+ ndd->dpa.start = 0;
+ ndd->dpa.end = -1;
+ ndd->dev = dev;

rc = nd_dimm_init_nsarea(ndd);
if (rc)
@@ -64,18 +71,34 @@ static int nd_dimm_probe(struct device *dev)

dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);

+ nd_bus_lock(dev);
+ ndd->ns_current = nd_label_validate(ndd);
+ ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
+ nd_label_copy(ndd, to_next_namespace_index(ndd),
+ to_current_namespace_index(ndd));
+ rc = nd_label_reserve_dpa(ndd);
+ nd_bus_unlock(dev);
+
+ if (rc)
+ goto err;
+
return 0;

err:
free_data(ndd);
return rc;
-
}

static int nd_dimm_remove(struct device *dev)
{
struct nd_dimm_drvdata *ndd = dev_get_drvdata(dev);
+ struct resource *res, *_r;

+ nd_bus_lock(dev);
+ dev_set_drvdata(dev, NULL);
+ for_each_dpa_resource_safe(ndd, res, _r)
+ __release_region(&ndd->dpa, res->start, resource_size(res));
+ nd_bus_unlock(dev);
free_data(ndd);

return 0;
diff --git a/drivers/block/nd/dimm_devs.c b/drivers/block/nd/dimm_devs.c
index 6192d9c82b9b..652dee210fe8 100644
--- a/drivers/block/nd/dimm_devs.c
+++ b/drivers/block/nd/dimm_devs.c
@@ -94,8 +94,12 @@ int nd_dimm_init_config_data(struct nd_dimm_drvdata *ndd)
if (ndd->data)
return 0;

- if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0)
+ if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
+ || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
+ dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
+ ndd->nsarea.max_xfer, ndd->nsarea.config_size);
return -ENXIO;
+ }

ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
if (!ndd->data)
diff --git a/drivers/block/nd/label.c b/drivers/block/nd/label.c
new file mode 100644
index 000000000000..e791ea8bbdde
--- /dev/null
+++ b/drivers/block/nd/label.c
@@ -0,0 +1,291 @@
+/*
+ * 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/device.h>
+#include <linux/ndctl.h>
+#include <linux/io.h>
+#include <linux/nd.h>
+#include "nd-private.h"
+#include "label.h"
+#include "nd.h"
+
+#include <asm-generic/io-64-nonatomic-lo-hi.h>
+
+static u32 best_seq(u32 a, u32 b)
+{
+ a &= NSINDEX_SEQ_MASK;
+ b &= NSINDEX_SEQ_MASK;
+
+ if (a == 0 || a == b)
+ return b;
+ else if (b == 0)
+ return a;
+ else if (nd_inc_seq(a) == b)
+ return b;
+ else
+ return a;
+}
+
+size_t sizeof_namespace_index(struct nd_dimm_drvdata *ndd)
+{
+ u32 index_span;
+
+ if (ndd->nsindex_size)
+ return ndd->nsindex_size;
+
+ /*
+ * The minimum index space is 512 bytes, with that amount of
+ * index we can describe ~1400 labels which is less than a byte
+ * of overhead per label. Round up to a byte of overhead per
+ * label and determine the size of the index region. Yes, this
+ * starts to waste space at larger config_sizes, but it's
+ * unlikely we'll ever see anything but 128K.
+ */
+ index_span = ndd->nsarea.config_size / 129;
+ index_span /= NSINDEX_ALIGN * 2;
+ ndd->nsindex_size = index_span * NSINDEX_ALIGN;
+
+ return ndd->nsindex_size;
+}
+
+int nd_label_validate(struct nd_dimm_drvdata *ndd)
+{
+ /*
+ * On media label format consists of two index blocks followed
+ * by an array of labels. None of these structures are ever
+ * updated in place. A sequence number tracks the current
+ * active index and the next one to write, while labels are
+ * written to free slots.
+ *
+ * +------------+
+ * | |
+ * | nsindex0 |
+ * | |
+ * +------------+
+ * | |
+ * | nsindex1 |
+ * | |
+ * +------------+
+ * | label0 |
+ * +------------+
+ * | label1 |
+ * +------------+
+ * | |
+ * ....nslot...
+ * | |
+ * +------------+
+ * | labelN |
+ * +------------+
+ */
+ struct nd_namespace_index __iomem *nsindex[] = {
+ to_namespace_index(ndd, 0),
+ to_namespace_index(ndd, 1),
+ };
+ const int num_index = ARRAY_SIZE(nsindex);
+ struct device *dev = ndd->dev;
+ bool valid[] = { false, false };
+ int i, num_valid = 0;
+ u32 seq;
+
+ for (i = 0; i < num_index; i++) {
+ u64 sum_save, sum;
+ u8 sig[NSINDEX_SIG_LEN];
+
+ memcpy_fromio(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
+ if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
+ dev_dbg(dev, "%s: nsindex%d signature invalid\n",
+ __func__, i);
+ continue;
+ }
+ sum_save = readq(&nsindex[i]->checksum);
+ writeq(0, &nsindex[i]->checksum);
+ sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd));
+ writeq(sum_save, &nsindex[i]->checksum);
+ if (sum != sum_save) {
+ dev_dbg(dev, "%s: nsindex%d checksum invalid\n",
+ __func__, i);
+ continue;
+ }
+ if ((readl(&nsindex[i]->seq) & NSINDEX_SEQ_MASK) == 0) {
+ dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n",
+ __func__, i, readl(&nsindex[i]->seq));
+ continue;
+ }
+
+ /* sanity check the index against expected values */
+ if (readq(&nsindex[i]->myoff)
+ != i * sizeof_namespace_index(ndd)) {
+ dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->myoff));
+ continue;
+ }
+ if (readq(&nsindex[i]->otheroff)
+ != (!i) * sizeof_namespace_index(ndd)) {
+ dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->otheroff));
+ continue;
+ }
+ if (readq(&nsindex[i]->mysize) > sizeof_namespace_index(ndd)
+ || readq(&nsindex[i]->mysize)
+ < sizeof(struct nd_namespace_index)) {
+ dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n",
+ __func__, i, (unsigned long long)
+ readq(&nsindex[i]->mysize));
+ continue;
+ }
+ if (readl(&nsindex[i]->nslot) * sizeof(struct nd_namespace_label)
+ + 2 * sizeof_namespace_index(ndd)
+ > ndd->nsarea.config_size) {
+ dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n",
+ __func__, i, readl(&nsindex[i]->nslot),
+ ndd->nsarea.config_size);
+ continue;
+ }
+ valid[i] = true;
+ num_valid++;
+ }
+
+ switch (num_valid) {
+ case 0:
+ break;
+ case 1:
+ for (i = 0; i < num_index; i++)
+ if (valid[i])
+ return i;
+ /* can't have num_valid > 0 but valid[] = { false, false } */
+ WARN_ON(1);
+ break;
+ default:
+ /* pick the best index... */
+ seq = best_seq(readl(&nsindex[0]->seq), readl(&nsindex[1]->seq));
+ if (seq == (readl(&nsindex[1]->seq) & NSINDEX_SEQ_MASK))
+ return 1;
+ else
+ return 0;
+ break;
+ }
+
+ return -1;
+}
+
+void nd_label_copy(struct nd_dimm_drvdata *ndd,
+ struct nd_namespace_index __iomem *dst,
+ struct nd_namespace_index __iomem *src)
+{
+ void *s, *d;
+
+ if (dst && src)
+ /* pass */;
+ else
+ return;
+
+ d = (void * __force) dst;
+ s = (void * __force) src;
+ memcpy(d, s, sizeof_namespace_index(ndd));
+}
+
+static struct nd_namespace_label __iomem *nd_label_base(struct nd_dimm_drvdata *ndd)
+{
+ void *base = to_namespace_index(ndd, 0);
+
+ return base + 2 * sizeof_namespace_index(ndd);
+}
+
+#define for_each_clear_bit_le(bit, addr, size) \
+ for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
+ (bit) < (size); \
+ (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
+
+/**
+ * preamble_current - common variable initialization for nd_label_* routines
+ * @nd_dimm: dimm container for the relevant label set
+ * @nsindex: on return set to the currently active namespace index
+ * @free: on return set to the free label bitmap in the index
+ * @nslot: on return set to the number of slots in the label space
+ */
+static bool preamble_current(struct nd_dimm_drvdata *ndd,
+ struct nd_namespace_index **nsindex,
+ unsigned long **free, u32 *nslot)
+{
+ *nsindex = to_current_namespace_index(ndd);
+ if (*nsindex == NULL)
+ return false;
+
+ *free = (unsigned long __force *) (*nsindex)->free;
+ *nslot = readl(&(*nsindex)->nslot);
+
+ return true;
+}
+
+static char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
+{
+ if (!label_id || !uuid)
+ return NULL;
+ snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb",
+ flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid);
+ return label_id->id;
+}
+
+static bool slot_valid(struct nd_namespace_label __iomem *nd_label, u32 slot)
+{
+ /* check that we are written where we expect to be written */
+ if (slot != readl(&nd_label->slot))
+ return false;
+
+ /* check that DPA allocations are page aligned */
+ if ((readq(&nd_label->dpa) | readq(&nd_label->rawsize)) % SZ_4K)
+ return false;
+
+ return true;
+}
+
+int nd_label_reserve_dpa(struct nd_dimm_drvdata *ndd)
+{
+ struct nd_namespace_index __iomem *nsindex;
+ unsigned long *free;
+ u32 nslot, slot;
+
+ if (!preamble_current(ndd, &nsindex, &free, &nslot))
+ return 0; /* no label, nothing to reserve */
+
+ for_each_clear_bit_le(slot, free, nslot) {
+ struct nd_namespace_label __iomem *nd_label;
+ struct nd_region *nd_region = NULL;
+ u8 label_uuid[NSLABEL_UUID_LEN];
+ struct nd_label_id *label_id;
+ struct resource *res;
+ u32 flags;
+
+ nd_label = nd_label_base(ndd) + slot;
+
+ if (!slot_valid(nd_label, slot))
+ continue;
+
+ label_id = devm_kzalloc(ndd->dev, sizeof(*label_id),
+ GFP_KERNEL);
+ if (!label_id)
+ return -ENOMEM;
+ memcpy_fromio(label_uuid, nd_label->uuid,
+ NSLABEL_UUID_LEN);
+ flags = readl(&nd_label->flags);
+ res = __request_region(&ndd->dpa, readq(&nd_label->dpa),
+ readq(&nd_label->rawsize),
+ nd_label_gen_id(label_id, label_uuid, flags), 0);
+ nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
+ if (!res)
+ return -EBUSY;
+ }
+
+ return 0;
+}
diff --git a/drivers/block/nd/label.h b/drivers/block/nd/label.h
new file mode 100644
index 000000000000..79ed885a43c0
--- /dev/null
+++ b/drivers/block/nd/label.h
@@ -0,0 +1,129 @@
+/*
+ * 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.
+ */
+#ifndef __LABEL_H__
+#define __LABEL_H__
+
+#include <linux/ndctl.h>
+#include <linux/sizes.h>
+#include <linux/io.h>
+
+enum {
+ NSINDEX_SIG_LEN = 16,
+ NSINDEX_ALIGN = 256,
+ NSINDEX_SEQ_MASK = 0x3,
+ NSLABEL_UUID_LEN = 16,
+ NSLABEL_NAME_LEN = 64,
+ NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
+ NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
+ NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
+ NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
+ BTT_ALIGN = 4096, /* all btt structures */
+ BTTINFO_SIG_LEN = 16,
+ BTTINFO_UUID_LEN = 16,
+ BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
+ BTTINFO_MAJOR_VERSION = 1,
+ ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
+ ND_LABEL_ID_SIZE = 50,
+};
+
+static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
+
+/**
+ * struct nd_namespace_index - label set superblock
+ * @sig: NAMESPACE_INDEX\0
+ * @flags: placeholder
+ * @seq: sequence number for this index
+ * @myoff: offset of this index in label area
+ * @mysize: size of this index struct
+ * @otheroff: offset of other index
+ * @labeloff: offset of first label slot
+ * @nslot: total number of label slots
+ * @major: label area major version
+ * @minor: label area minor version
+ * @checksum: fletcher64 of all fields
+ * @free[0]: bitmap, nlabel bits
+ *
+ * The size of free[] is rounded up so the total struct size is a
+ * multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond
+ * nlabel bits must be zero.
+ */
+struct nd_namespace_index {
+ u8 sig[NSINDEX_SIG_LEN];
+ __le32 flags;
+ __le32 seq;
+ __le64 myoff;
+ __le64 mysize;
+ __le64 otheroff;
+ __le64 labeloff;
+ __le32 nslot;
+ __le16 major;
+ __le16 minor;
+ __le64 checksum;
+ u8 free[0];
+};
+
+/**
+ * struct nd_namespace_label - namespace superblock
+ * @uuid: UUID per RFC 4122
+ * @name: optional name (NULL-terminated)
+ * @flags: see NSLABEL_FLAG_*
+ * @nlabel: num labels to describe this ns
+ * @position: labels position in set
+ * @isetcookie: interleave set cookie
+ * @lbasize: LBA size in bytes or 0 for pmem
+ * @dpa: DPA of NVM range on this DIMM
+ * @rawsize: size of namespace
+ * @slot: slot of this label in label area
+ * @unused: must be zero
+ */
+struct nd_namespace_label {
+ u8 uuid[NSLABEL_UUID_LEN];
+ u8 name[NSLABEL_NAME_LEN];
+ __le32 flags;
+ __le16 nlabel;
+ __le16 position;
+ __le64 isetcookie;
+ __le64 lbasize;
+ __le64 dpa;
+ __le64 rawsize;
+ __le32 slot;
+ __le32 unused;
+};
+
+/**
+ * struct nd_label_id - identifier string for dpa allocation
+ * @id: "{blk|pmem}-<namespace uuid>"
+ */
+struct nd_label_id {
+ char id[ND_LABEL_ID_SIZE];
+};
+
+/*
+ * If the 'best' index is invalid, so is the 'next' index. Otherwise,
+ * the next index is MOD(index+1, 2)
+ */
+static inline int nd_label_next_nsindex(int index)
+{
+ if (index < 0)
+ return -1;
+
+ return (index + 1) % 2;
+}
+
+struct nd_dimm_drvdata;
+int nd_label_validate(struct nd_dimm_drvdata *ndd);
+void nd_label_copy(struct nd_dimm_drvdata *ndd,
+ struct nd_namespace_index *dst,
+ struct nd_namespace_index *src);
+size_t sizeof_namespace_index(struct nd_dimm_drvdata *ndd);
+#endif /* __LABEL_H__ */
diff --git a/drivers/block/nd/nd.h b/drivers/block/nd/nd.h
index 4deed46884c1..f8dee1df5e6a 100644
--- a/drivers/block/nd/nd.h
+++ b/drivers/block/nd/nd.h
@@ -15,11 +15,15 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
+#include "label.h"

struct nd_dimm_drvdata {
struct device *dev;
+ int nsindex_size;
struct nfit_cmd_get_config_size nsarea;
void *data;
+ int ns_current, ns_next;
+ struct resource dpa;
};

struct nd_region_namespaces {
@@ -27,12 +31,43 @@ struct nd_region_namespaces {
int active;
};

+static inline struct nd_namespace_index __iomem *to_namespace_index(
+ struct nd_dimm_drvdata *ndd, int i)
+{
+ if (i < 0)
+ return NULL;
+
+ return ((void __iomem *) ndd->data + sizeof_namespace_index(ndd) * i);
+}
+
+static inline struct nd_namespace_index __iomem *to_current_namespace_index(
+ struct nd_dimm_drvdata *ndd)
+{
+ return to_namespace_index(ndd, ndd->ns_current);
+}
+
+static inline struct nd_namespace_index __iomem *to_next_namespace_index(
+ struct nd_dimm_drvdata *ndd)
+{
+ return to_namespace_index(ndd, ndd->ns_next);
+}
+
struct nd_mapping {
struct nd_dimm *nd_dimm;
u64 start;
u64 size;
};

+#define nd_dbg_dpa(r, d, res, fmt, arg...) \
+ dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
+ (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
+ (unsigned long long) (res ? resource_size(res) : 0), \
+ (unsigned long long) (res ? res->start : 0), ##arg)
+
+#define for_each_dpa_resource_safe(ndd, res, next) \
+ for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
+ res; res = next, next = next ? next->sibling : NULL)
+
struct nd_region {
struct device dev;
struct nd_spa *nd_spa;
@@ -43,6 +78,15 @@ struct nd_region {
struct nd_mapping mapping[0];
};

+/*
+ * Lookup next in the repeating sequence of 01, 10, and 11.
+ */
+static inline unsigned nd_inc_seq(unsigned seq)
+{
+ static const unsigned next[] = { 0, 2, 3, 1 };
+
+ return next[seq & 3];
+}
enum nd_async_mode {
ND_SYNC,
ND_ASYNC,
@@ -67,4 +111,5 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
void nd_bus_lock(struct device *dev);
void nd_bus_unlock(struct device *dev);
bool is_nd_bus_locked(struct device *dev);
+int nd_label_reserve_dpa(struct nd_dimm_drvdata *ndd);
#endif /* __ND_H__ */
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 0ccc0f2e5765..097e67a8d477 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -175,7 +175,6 @@ static inline const char *nfit_dimm_cmd_name(unsigned cmd)
#define NFIT_IOCTL_ARS_QUERY _IOWR(ND_IOCTL, NFIT_CMD_ARS_QUERY,\
struct nfit_cmd_ars_query)

-
#define ND_DEVICE_DIMM 1 /* nd_dimm: container for "config data" */
#define ND_DEVICE_REGION_PMEM 2 /* nd_region: (parent of pmem namespaces) */
#define ND_DEVICE_REGION_BLOCK 3 /* nd_region: (parent of block namespaces) */


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