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linux/drivers/nvdimm/label.c

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/*
* 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/uuid.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "label.h"
#include "nd.h"
static guid_t nvdimm_btt_guid;
static guid_t nvdimm_btt2_guid;
static guid_t nvdimm_pfn_guid;
static guid_t nvdimm_dax_guid;
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;
}
unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd)
{
return ndd->nslabel_size;
}
static size_t __sizeof_namespace_index(u32 nslot)
{
return ALIGN(sizeof(struct nd_namespace_index) + DIV_ROUND_UP(nslot, 8),
NSINDEX_ALIGN);
}
static int __nvdimm_num_label_slots(struct nvdimm_drvdata *ndd,
size_t index_size)
{
return (ndd->nsarea.config_size - index_size * 2) /
sizeof_namespace_label(ndd);
}
int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
{
u32 tmp_nslot, n;
tmp_nslot = ndd->nsarea.config_size / sizeof_namespace_label(ndd);
n = __sizeof_namespace_index(tmp_nslot) / NSINDEX_ALIGN;
return __nvdimm_num_label_slots(ndd, NSINDEX_ALIGN * n);
}
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
{
u32 nslot, space, size;
/*
* Per UEFI 2.7, the minimum size of the Label Storage Area is large
* enough to hold 2 index blocks and 2 labels. The minimum index
* block size is 256 bytes. The label size is 128 for namespaces
* prior to version 1.2 and at minimum 256 for version 1.2 and later.
*/
nslot = nvdimm_num_label_slots(ndd);
space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd);
size = __sizeof_namespace_index(nslot) * 2;
if (size <= space && nslot >= 2)
return size / 2;
dev_err(ndd->dev, "label area (%d) too small to host (%d byte) labels\n",
ndd->nsarea.config_size, sizeof_namespace_label(ndd));
return 0;
}
static int __nd_label_validate(struct nvdimm_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 *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[2] = { 0 };
int i, num_valid = 0;
u32 seq;
for (i = 0; i < num_index; i++) {
u32 nslot;
u8 sig[NSINDEX_SIG_LEN];
u64 sum_save, sum, size;
unsigned int version, labelsize;
memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
dev_dbg(dev, "nsindex%d signature invalid\n", i);
continue;
}
/* label sizes larger than 128 arrived with v1.2 */
version = __le16_to_cpu(nsindex[i]->major) * 100
+ __le16_to_cpu(nsindex[i]->minor);
if (version >= 102)
labelsize = 1 << (7 + nsindex[i]->labelsize);
else
labelsize = 128;
if (labelsize != sizeof_namespace_label(ndd)) {
dev_dbg(dev, "nsindex%d labelsize %d invalid\n",
i, nsindex[i]->labelsize);
continue;
}
sum_save = __le64_to_cpu(nsindex[i]->checksum);
nsindex[i]->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
nsindex[i]->checksum = __cpu_to_le64(sum_save);
if (sum != sum_save) {
dev_dbg(dev, "nsindex%d checksum invalid\n", i);
continue;
}
seq = __le32_to_cpu(nsindex[i]->seq);
if ((seq & NSINDEX_SEQ_MASK) == 0) {
dev_dbg(dev, "nsindex%d sequence: %#x invalid\n", i, seq);
continue;
}
/* sanity check the index against expected values */
if (__le64_to_cpu(nsindex[i]->myoff)
!= i * sizeof_namespace_index(ndd)) {
dev_dbg(dev, "nsindex%d myoff: %#llx invalid\n",
i, (unsigned long long)
__le64_to_cpu(nsindex[i]->myoff));
continue;
}
if (__le64_to_cpu(nsindex[i]->otheroff)
!= (!i) * sizeof_namespace_index(ndd)) {
dev_dbg(dev, "nsindex%d otheroff: %#llx invalid\n",
i, (unsigned long long)
__le64_to_cpu(nsindex[i]->otheroff));
continue;
}
if (__le64_to_cpu(nsindex[i]->labeloff)
!= 2 * sizeof_namespace_index(ndd)) {
dev_dbg(dev, "nsindex%d labeloff: %#llx invalid\n",
i, (unsigned long long)
__le64_to_cpu(nsindex[i]->labeloff));
continue;
}
size = __le64_to_cpu(nsindex[i]->mysize);
if (size > sizeof_namespace_index(ndd)
|| size < sizeof(struct nd_namespace_index)) {
dev_dbg(dev, "nsindex%d mysize: %#llx invalid\n", i, size);
continue;
}
nslot = __le32_to_cpu(nsindex[i]->nslot);
if (nslot * sizeof_namespace_label(ndd)
+ 2 * sizeof_namespace_index(ndd)
> ndd->nsarea.config_size) {
dev_dbg(dev, "nsindex%d nslot: %u invalid, config_size: %#x\n",
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(__le32_to_cpu(nsindex[0]->seq),
__le32_to_cpu(nsindex[1]->seq));
if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK))
return 1;
else
return 0;
break;
}
return -1;
}
static int nd_label_validate(struct nvdimm_drvdata *ndd)
{
/*
* In order to probe for and validate namespace index blocks we
* need to know the size of the labels, and we can't trust the
* size of the labels until we validate the index blocks.
* Resolve this dependency loop by probing for known label
* sizes, but default to v1.2 256-byte namespace labels if
* discovery fails.
*/
int label_size[] = { 128, 256 };
int i, rc;
for (i = 0; i < ARRAY_SIZE(label_size); i++) {
ndd->nslabel_size = label_size[i];
rc = __nd_label_validate(ndd);
if (rc >= 0)
return rc;
}
return -1;
}
static void nd_label_copy(struct nvdimm_drvdata *ndd,
struct nd_namespace_index *dst,
struct nd_namespace_index *src)
{
/* just exit if either destination or source is NULL */
if (!dst || !src)
return;
memcpy(dst, src, sizeof_namespace_index(ndd));
}
static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
{
void *base = to_namespace_index(ndd, 0);
return base + 2 * sizeof_namespace_index(ndd);
}
static int to_slot(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
unsigned long label, base;
label = (unsigned long) nd_label;
base = (unsigned long) nd_label_base(ndd);
return (label - base) / sizeof_namespace_label(ndd);
}
static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot)
{
unsigned long label, base;
base = (unsigned long) nd_label_base(ndd);
label = base + sizeof_namespace_label(ndd) * slot;
return (struct nd_namespace_label *) label;
}
#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_index - common variable initialization for nd_label_* routines
* @ndd: dimm container for the relevant label set
* @idx: namespace_index index
* @nsindex_out: 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_index(struct nvdimm_drvdata *ndd, int idx,
struct nd_namespace_index **nsindex_out,
unsigned long **free, u32 *nslot)
{
struct nd_namespace_index *nsindex;
nsindex = to_namespace_index(ndd, idx);
if (nsindex == NULL)
return false;
*free = (unsigned long *) nsindex->free;
*nslot = __le32_to_cpu(nsindex->nslot);
*nsindex_out = nsindex;
return true;
}
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 preamble_current(struct nvdimm_drvdata *ndd,
struct nd_namespace_index **nsindex,
unsigned long **free, u32 *nslot)
{
return preamble_index(ndd, ndd->ns_current, nsindex,
free, nslot);
}
static bool preamble_next(struct nvdimm_drvdata *ndd,
struct nd_namespace_index **nsindex,
unsigned long **free, u32 *nslot)
{
return preamble_index(ndd, ndd->ns_next, nsindex,
free, nslot);
}
static bool slot_valid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u32 slot)
{
/* check that we are written where we expect to be written */
if (slot != __le32_to_cpu(nd_label->slot))
return false;
/* check that DPA allocations are page aligned */
if ((__le64_to_cpu(nd_label->dpa)
| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
return false;
/* check checksum */
if (namespace_label_has(ndd, checksum)) {
u64 sum, sum_save;
sum_save = __le64_to_cpu(nd_label->checksum);
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum_save);
if (sum != sum_save) {
dev_dbg(ndd->dev, "fail checksum. slot: %d expect: %#llx\n",
slot, sum);
return false;
}
}
return true;
}
int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
{
struct nd_namespace_index *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 *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 = to_label(ndd, slot);
if (!slot_valid(ndd, nd_label, slot))
continue;
memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
flags = __le32_to_cpu(nd_label->flags);
nd_label_gen_id(&label_id, label_uuid, flags);
res = nvdimm_allocate_dpa(ndd, &label_id,
__le64_to_cpu(nd_label->dpa),
__le64_to_cpu(nd_label->rawsize));
nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
if (!res)
return -EBUSY;
}
return 0;
}
int nd_label_data_init(struct nvdimm_drvdata *ndd)
{
size_t config_size, read_size, max_xfer, offset;
struct nd_namespace_index *nsindex;
unsigned int i;
int rc = 0;
u32 nslot;
if (ndd->data)
return 0;
if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) {
dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n",
ndd->nsarea.max_xfer, ndd->nsarea.config_size);
return -ENXIO;
}
/*
* We need to determine the maximum index area as this is the section
* we must read and validate before we can start processing labels.
*
* If the area is too small to contain the two indexes and 2 labels
* then we abort.
*
* Start at a label size of 128 as this should result in the largest
* possible namespace index size.
*/
ndd->nslabel_size = 128;
read_size = sizeof_namespace_index(ndd) * 2;
if (!read_size)
return -ENXIO;
/* Allocate config data */
config_size = ndd->nsarea.config_size;
ndd->data = kvzalloc(config_size, GFP_KERNEL);
if (!ndd->data)
return -ENOMEM;
/*
* We want to guarantee as few reads as possible while conserving
* memory. To do that we figure out how much unused space will be left
* in the last read, divide that by the total number of reads it is
* going to take given our maximum transfer size, and then reduce our
* maximum transfer size based on that result.
*/
max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);
if (read_size < max_xfer) {
/* trim waste */
max_xfer -= ((max_xfer - 1) - (config_size - 1) % max_xfer) /
DIV_ROUND_UP(config_size, max_xfer);
/* make certain we read indexes in exactly 1 read */
if (max_xfer < read_size)
max_xfer = read_size;
}
/* Make our initial read size a multiple of max_xfer size */
read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,
config_size);
/* Read the index data */
rc = nvdimm_get_config_data(ndd, ndd->data, 0, read_size);
if (rc)
goto out_err;
/* Validate index data, if not valid assume all labels are invalid */
ndd->ns_current = nd_label_validate(ndd);
if (ndd->ns_current < 0)
return 0;
/* Record our index values */
ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
/* Copy "current" index on top of the "next" index */
nsindex = to_current_namespace_index(ndd);
nd_label_copy(ndd, to_next_namespace_index(ndd), nsindex);
/* Determine starting offset for label data */
offset = __le64_to_cpu(nsindex->labeloff);
nslot = __le32_to_cpu(nsindex->nslot);
/* Loop through the free list pulling in any active labels */
for (i = 0; i < nslot; i++, offset += ndd->nslabel_size) {
size_t label_read_size;
/* zero out the unused labels */
if (test_bit_le(i, nsindex->free)) {
memset(ndd->data + offset, 0, ndd->nslabel_size);
continue;
}
/* if we already read past here then just continue */
if (offset + ndd->nslabel_size <= read_size)
continue;
/* if we haven't read in a while reset our read_size offset */
if (read_size < offset)
read_size = offset;
/* determine how much more will be read after this next call. */
label_read_size = offset + ndd->nslabel_size - read_size;
label_read_size = DIV_ROUND_UP(label_read_size, max_xfer) *
max_xfer;
/* truncate last read if needed */
if (read_size + label_read_size > config_size)
label_read_size = config_size - read_size;
/* Read the label data */
rc = nvdimm_get_config_data(ndd, ndd->data + read_size,
read_size, label_read_size);
if (rc)
goto out_err;
/* push read_size to next read offset */
read_size += label_read_size;
}
dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc);
out_err:
return rc;
}
int nd_label_active_count(struct nvdimm_drvdata *ndd)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
u32 nslot, slot;
int count = 0;
if (!preamble_current(ndd, &nsindex, &free, &nslot))
return 0;
for_each_clear_bit_le(slot, free, nslot) {
struct nd_namespace_label *nd_label;
nd_label = to_label(ndd, slot);
if (!slot_valid(ndd, nd_label, slot)) {
u32 label_slot = __le32_to_cpu(nd_label->slot);
u64 size = __le64_to_cpu(nd_label->rawsize);
u64 dpa = __le64_to_cpu(nd_label->dpa);
dev_dbg(ndd->dev,
"slot%d invalid slot: %d dpa: %llx size: %llx\n",
slot, label_slot, dpa, size);
continue;
}
count++;
}
return count;
}
struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
u32 nslot, slot;
if (!preamble_current(ndd, &nsindex, &free, &nslot))
return NULL;
for_each_clear_bit_le(slot, free, nslot) {
struct nd_namespace_label *nd_label;
nd_label = to_label(ndd, slot);
if (!slot_valid(ndd, nd_label, slot))
continue;
if (n-- == 0)
return to_label(ndd, slot);
}
return NULL;
}
u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
u32 nslot, slot;
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return UINT_MAX;
WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
slot = find_next_bit_le(free, nslot, 0);
if (slot == nslot)
return UINT_MAX;
clear_bit_le(slot, free);
return slot;
}
bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
u32 nslot;
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return false;
WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
if (slot < nslot)
return !test_and_set_bit_le(slot, free);
return false;
}
u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
{
struct nd_namespace_index *nsindex;
unsigned long *free;
u32 nslot;
WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return nvdimm_num_label_slots(ndd);
return bitmap_weight(free, nslot);
}
static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
unsigned long flags)
{
struct nd_namespace_index *nsindex;
unsigned long offset;
u64 checksum;
u32 nslot;
int rc;
nsindex = to_namespace_index(ndd, index);
if (flags & ND_NSINDEX_INIT)
nslot = nvdimm_num_label_slots(ndd);
else
nslot = __le32_to_cpu(nsindex->nslot);
memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
memset(&nsindex->flags, 0, 3);
nsindex->labelsize = sizeof_namespace_label(ndd) >> 8;
nsindex->seq = __cpu_to_le32(seq);
offset = (unsigned long) nsindex
- (unsigned long) to_namespace_index(ndd, 0);
nsindex->myoff = __cpu_to_le64(offset);
nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd));
offset = (unsigned long) to_namespace_index(ndd,
nd_label_next_nsindex(index))
- (unsigned long) to_namespace_index(ndd, 0);
nsindex->otheroff = __cpu_to_le64(offset);
offset = (unsigned long) nd_label_base(ndd)
- (unsigned long) to_namespace_index(ndd, 0);
nsindex->labeloff = __cpu_to_le64(offset);
nsindex->nslot = __cpu_to_le32(nslot);
nsindex->major = __cpu_to_le16(1);
if (sizeof_namespace_label(ndd) < 256)
nsindex->minor = __cpu_to_le16(1);
else
nsindex->minor = __cpu_to_le16(2);
nsindex->checksum = __cpu_to_le64(0);
if (flags & ND_NSINDEX_INIT) {
unsigned long *free = (unsigned long *) nsindex->free;
u32 nfree = ALIGN(nslot, BITS_PER_LONG);
int last_bits, i;
memset(nsindex->free, 0xff, nfree / 8);
for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
clear_bit_le(nslot + i, free);
}
checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1);
nsindex->checksum = __cpu_to_le64(checksum);
rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff),
nsindex, sizeof_namespace_index(ndd));
if (rc < 0)
return rc;
if (flags & ND_NSINDEX_INIT)
return 0;
/* copy the index we just wrote to the new 'next' */
WARN_ON(index != ndd->ns_next);
nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
WARN_ON(ndd->ns_current == ndd->ns_next);
return 0;
}
static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return (unsigned long) nd_label
- (unsigned long) to_namespace_index(ndd, 0);
}
enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
{
if (guid_equal(guid, &nvdimm_btt_guid))
return NVDIMM_CCLASS_BTT;
else if (guid_equal(guid, &nvdimm_btt2_guid))
return NVDIMM_CCLASS_BTT2;
else if (guid_equal(guid, &nvdimm_pfn_guid))
return NVDIMM_CCLASS_PFN;
else if (guid_equal(guid, &nvdimm_dax_guid))
return NVDIMM_CCLASS_DAX;
else if (guid_equal(guid, &guid_null))
return NVDIMM_CCLASS_NONE;
return NVDIMM_CCLASS_UNKNOWN;
}
static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
guid_t *target)
{
if (claim_class == NVDIMM_CCLASS_BTT)
return &nvdimm_btt_guid;
else if (claim_class == NVDIMM_CCLASS_BTT2)
return &nvdimm_btt2_guid;
else if (claim_class == NVDIMM_CCLASS_PFN)
return &nvdimm_pfn_guid;
else if (claim_class == NVDIMM_CCLASS_DAX)
return &nvdimm_dax_guid;
else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
/*
* If we're modifying a namespace for which we don't
* know the claim_class, don't touch the existing guid.
*/
return target;
} else
return &guid_null;
}
static int __pmem_label_update(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
int pos)
{
struct nd_namespace_common *ndns = &nspm->nsio.common;
struct nd_interleave_set *nd_set = nd_region->nd_set;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_label_ent *label_ent, *victim = NULL;
struct nd_namespace_label *nd_label;
struct nd_namespace_index *nsindex;
struct nd_label_id label_id;
struct resource *res;
unsigned long *free;
u32 nslot, slot;
size_t offset;
u64 cookie;
int rc;
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return -ENXIO;
cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
nd_label_gen_id(&label_id, nspm->uuid, 0);
for_each_dpa_resource(ndd, res)
if (strcmp(res->name, label_id.id) == 0)
break;
if (!res) {
WARN_ON_ONCE(1);
return -ENXIO;
}
/* allocate and write the label to the staging (next) index */
slot = nd_label_alloc_slot(ndd);
if (slot == UINT_MAX)
return -ENXIO;
dev_dbg(ndd->dev, "allocated: %d\n", slot);
nd_label = to_label(ndd, slot);
memset(nd_label, 0, sizeof_namespace_label(ndd));
memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
if (nspm->alt_name)
memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING);
nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
nd_label->position = __cpu_to_le16(pos);
nd_label->isetcookie = __cpu_to_le64(cookie);
nd_label->rawsize = __cpu_to_le64(resource_size(res));
nd_label->lbasize = __cpu_to_le64(nspm->lbasize);
nd_label->dpa = __cpu_to_le64(res->start);
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, abstraction_guid))
guid_copy(&nd_label->abstraction_guid,
to_abstraction_guid(ndns->claim_class,
&nd_label->abstraction_guid));
if (namespace_label_has(ndd, checksum)) {
u64 sum;
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum);
}
nd_dbg_dpa(nd_region, ndd, res, "\n");
/* update label */
offset = nd_label_offset(ndd, nd_label);
rc = nvdimm_set_config_data(ndd, offset, nd_label,
sizeof_namespace_label(ndd));
if (rc < 0)
return rc;
/* Garbage collect the previous label */
mutex_lock(&nd_mapping->lock);
list_for_each_entry(label_ent, &nd_mapping->labels, list) {
if (!label_ent->label)
continue;
if (memcmp(nspm->uuid, label_ent->label->uuid,
NSLABEL_UUID_LEN) != 0)
continue;
victim = label_ent;
list_move_tail(&victim->list, &nd_mapping->labels);
break;
}
if (victim) {
dev_dbg(ndd->dev, "free: %d\n", slot);
slot = to_slot(ndd, victim->label);
nd_label_free_slot(ndd, slot);
victim->label = NULL;
}
/* update index */
rc = nd_label_write_index(ndd, ndd->ns_next,
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
if (rc == 0) {
list_for_each_entry(label_ent, &nd_mapping->labels, list)
if (!label_ent->label) {
label_ent->label = nd_label;
nd_label = NULL;
break;
}
dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label,
"failed to track label: %d\n",
to_slot(ndd, nd_label));
if (nd_label)
rc = -ENXIO;
}
mutex_unlock(&nd_mapping->lock);
return rc;
}
static bool is_old_resource(struct resource *res, struct resource **list, int n)
{
int i;
if (res->flags & DPA_RESOURCE_ADJUSTED)
return false;
for (i = 0; i < n; i++)
if (res == list[i])
return true;
return false;
}
static struct resource *to_resource(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
struct resource *res;
for_each_dpa_resource(ndd, res) {
if (res->start != __le64_to_cpu(nd_label->dpa))
continue;
if (resource_size(res) != __le64_to_cpu(nd_label->rawsize))
continue;
return res;
}
return NULL;
}
/*
* 1/ Account all the labels that can be freed after this update
* 2/ Allocate and write the label to the staging (next) index
* 3/ Record the resources in the namespace device
*/
static int __blk_label_update(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk,
int num_labels)
{
int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO;
struct nd_interleave_set *nd_set = nd_region->nd_set;
struct nd_namespace_common *ndns = &nsblk->common;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_namespace_label *nd_label;
struct nd_label_ent *label_ent, *e;
struct nd_namespace_index *nsindex;
unsigned long *free, *victim_map = NULL;
struct resource *res, **old_res_list;
struct nd_label_id label_id;
u8 uuid[NSLABEL_UUID_LEN];
int min_dpa_idx = 0;
LIST_HEAD(list);
u32 nslot, slot;
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return -ENXIO;
old_res_list = nsblk->res;
nfree = nd_label_nfree(ndd);
old_num_resources = nsblk->num_resources;
nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
/*
* We need to loop over the old resources a few times, which seems a
* bit inefficient, but we need to know that we have the label
* space before we start mutating the tracking structures.
* Otherwise the recovery method of last resort for userspace is
* disable and re-enable the parent region.
*/
alloc = 0;
for_each_dpa_resource(ndd, res) {
if (strcmp(res->name, label_id.id) != 0)
continue;
if (!is_old_resource(res, old_res_list, old_num_resources))
alloc++;
}
victims = 0;
if (old_num_resources) {
/* convert old local-label-map to dimm-slot victim-map */
victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long),
GFP_KERNEL);
if (!victim_map)
return -ENOMEM;
/* mark unused labels for garbage collection */
for_each_clear_bit_le(slot, free, nslot) {
nd_label = to_label(ndd, slot);
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
continue;
res = to_resource(ndd, nd_label);
if (res && is_old_resource(res, old_res_list,
old_num_resources))
continue;
slot = to_slot(ndd, nd_label);
set_bit(slot, victim_map);
victims++;
}
}
/* don't allow updates that consume the last label */
if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
dev_info(&nsblk->common.dev, "insufficient label space\n");
kfree(victim_map);
return -ENOSPC;
}
/* from here on we need to abort on error */
/* assign all resources to the namespace before writing the labels */
nsblk->res = NULL;
nsblk->num_resources = 0;
for_each_dpa_resource(ndd, res) {
if (strcmp(res->name, label_id.id) != 0)
continue;
if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) {
rc = -ENOMEM;
goto abort;
}
}
/*
* Find the resource associated with the first label in the set
* per the v1.2 namespace specification.
*/
for (i = 0; i < nsblk->num_resources; i++) {
struct resource *min = nsblk->res[min_dpa_idx];
res = nsblk->res[i];
if (res->start < min->start)
min_dpa_idx = i;
}
for (i = 0; i < nsblk->num_resources; i++) {
size_t offset;
res = nsblk->res[i];
if (is_old_resource(res, old_res_list, old_num_resources))
continue; /* carry-over */
slot = nd_label_alloc_slot(ndd);
if (slot == UINT_MAX)
goto abort;
dev_dbg(ndd->dev, "allocated: %d\n", slot);
nd_label = to_label(ndd, slot);
memset(nd_label, 0, sizeof_namespace_label(ndd));
memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN);
if (nsblk->alt_name)
memcpy(nd_label->name, nsblk->alt_name,
NSLABEL_NAME_LEN);
nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL);
/*
* Use the presence of the type_guid as a flag to
* determine isetcookie usage and nlabel + position
* policy for blk-aperture namespaces.
*/
if (namespace_label_has(ndd, type_guid)) {
if (i == min_dpa_idx) {
nd_label->nlabel = __cpu_to_le16(nsblk->num_resources);
nd_label->position = __cpu_to_le16(0);
} else {
nd_label->nlabel = __cpu_to_le16(0xffff);
nd_label->position = __cpu_to_le16(0xffff);
}
nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2);
} else {
nd_label->nlabel = __cpu_to_le16(0); /* N/A */
nd_label->position = __cpu_to_le16(0); /* N/A */
nd_label->isetcookie = __cpu_to_le64(0); /* N/A */
}
nd_label->dpa = __cpu_to_le64(res->start);
nd_label->rawsize = __cpu_to_le64(resource_size(res));
nd_label->lbasize = __cpu_to_le64(nsblk->lbasize);
nd_label->slot = __cpu_to_le32(slot);
if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, &nd_set->type_guid);
if (namespace_label_has(ndd, abstraction_guid))
guid_copy(&nd_label->abstraction_guid,
to_abstraction_guid(ndns->claim_class,
&nd_label->abstraction_guid));
if (namespace_label_has(ndd, checksum)) {
u64 sum;
nd_label->checksum = __cpu_to_le64(0);
sum = nd_fletcher64(nd_label,
sizeof_namespace_label(ndd), 1);
nd_label->checksum = __cpu_to_le64(sum);
}
/* update label */
offset = nd_label_offset(ndd, nd_label);
rc = nvdimm_set_config_data(ndd, offset, nd_label,
sizeof_namespace_label(ndd));
if (rc < 0)
goto abort;
}
/* free up now unused slots in the new index */
for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) {
dev_dbg(ndd->dev, "free: %d\n", slot);
nd_label_free_slot(ndd, slot);
}
/* update index */
rc = nd_label_write_index(ndd, ndd->ns_next,
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
if (rc)
goto abort;
/*
* Now that the on-dimm labels are up to date, fix up the tracking
* entries in nd_mapping->labels
*/
nlabel = 0;
mutex_lock(&nd_mapping->lock);
list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
nd_label = label_ent->label;
if (!nd_label)
continue;
nlabel++;
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
continue;
nlabel--;
list_move(&label_ent->list, &list);
label_ent->label = NULL;
}
list_splice_tail_init(&list, &nd_mapping->labels);
mutex_unlock(&nd_mapping->lock);
if (nlabel + nsblk->num_resources > num_labels) {
/*
* Bug, we can't end up with more resources than
* available labels
*/
WARN_ON_ONCE(1);
rc = -ENXIO;
goto out;
}
mutex_lock(&nd_mapping->lock);
label_ent = list_first_entry_or_null(&nd_mapping->labels,
typeof(*label_ent), list);
if (!label_ent) {
WARN_ON(1);
mutex_unlock(&nd_mapping->lock);
rc = -ENXIO;
goto out;
}
for_each_clear_bit_le(slot, free, nslot) {
nd_label = to_label(ndd, slot);
memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0)
continue;
res = to_resource(ndd, nd_label);
res->flags &= ~DPA_RESOURCE_ADJUSTED;
dev_vdbg(&nsblk->common.dev, "assign label slot: %d\n", slot);
list_for_each_entry_from(label_ent, &nd_mapping->labels, list) {
if (label_ent->label)
continue;
label_ent->label = nd_label;
nd_label = NULL;
break;
}
if (nd_label)
dev_WARN(&nsblk->common.dev,
"failed to track label slot%d\n", slot);
}
mutex_unlock(&nd_mapping->lock);
out:
kfree(old_res_list);
kfree(victim_map);
return rc;
abort:
/*
* 1/ repair the allocated label bitmap in the index
* 2/ restore the resource list
*/
nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd));
kfree(nsblk->res);
nsblk->res = old_res_list;
nsblk->num_resources = old_num_resources;
old_res_list = NULL;
goto out;
}
static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
{
int i, old_num_labels = 0;
struct nd_label_ent *label_ent;
struct nd_namespace_index *nsindex;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
mutex_lock(&nd_mapping->lock);
list_for_each_entry(label_ent, &nd_mapping->labels, list)
old_num_labels++;
mutex_unlock(&nd_mapping->lock);
/*
* We need to preserve all the old labels for the mapping so
* they can be garbage collected after writing the new labels.
*/
for (i = old_num_labels; i < num_labels; i++) {
label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
if (!label_ent)
return -ENOMEM;
mutex_lock(&nd_mapping->lock);
list_add_tail(&label_ent->list, &nd_mapping->labels);
mutex_unlock(&nd_mapping->lock);
}
if (ndd->ns_current == -1 || ndd->ns_next == -1)
/* pass */;
else
return max(num_labels, old_num_labels);
nsindex = to_namespace_index(ndd, 0);
memset(nsindex, 0, ndd->nsarea.config_size);
for (i = 0; i < 2; i++) {
int rc = nd_label_write_index(ndd, i, 3 - i, ND_NSINDEX_INIT);
if (rc)
return rc;
}
ndd->ns_next = 1;
ndd->ns_current = 0;
return max(num_labels, old_num_labels);
}
static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_label_ent *label_ent, *e;
struct nd_namespace_index *nsindex;
u8 label_uuid[NSLABEL_UUID_LEN];
unsigned long *free;
LIST_HEAD(list);
u32 nslot, slot;
int active = 0;
if (!uuid)
return 0;
/* no index || no labels == nothing to delete */
if (!preamble_next(ndd, &nsindex, &free, &nslot))
return 0;
mutex_lock(&nd_mapping->lock);
list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
struct nd_namespace_label *nd_label = label_ent->label;
if (!nd_label)
continue;
active++;
memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0)
continue;
active--;
slot = to_slot(ndd, nd_label);
nd_label_free_slot(ndd, slot);
dev_dbg(ndd->dev, "free: %d\n", slot);
list_move_tail(&label_ent->list, &list);
label_ent->label = NULL;
}
list_splice_tail_init(&list, &nd_mapping->labels);
if (active == 0) {
nd_mapping_free_labels(nd_mapping);
dev_dbg(ndd->dev, "no more active labels\n");
}
mutex_unlock(&nd_mapping->lock);
return nd_label_write_index(ndd, ndd->ns_next,
nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
}
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size)
{
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res;
int rc, count = 0;
if (size == 0) {
rc = del_labels(nd_mapping, nspm->uuid);
if (rc)
return rc;
continue;
}
for_each_dpa_resource(ndd, res)
if (strncmp(res->name, "pmem", 4) == 0)
count++;
WARN_ON_ONCE(!count);
rc = init_labels(nd_mapping, count);
if (rc < 0)
return rc;
rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
if (rc)
return rc;
}
return 0;
}
int nd_blk_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_blk *nsblk, resource_size_t size)
{
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
struct resource *res;
int count = 0;
if (size == 0)
return del_labels(nd_mapping, nsblk->uuid);
for_each_dpa_resource(to_ndd(nd_mapping), res)
count++;
count = init_labels(nd_mapping, count);
if (count < 0)
return count;
return __blk_label_update(nd_region, nd_mapping, nsblk, count);
}
int __init nd_label_init(void)
{
WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
WARN_ON(guid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_guid));
WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
return 0;
}
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