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libnvdimm: namespace indices: read and validate
This on media label format [1] 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.
[1]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
parent
eaf961536e
commit
4a826c83db
@ -10,3 +10,4 @@ libnvdimm-y += dimm.o
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libnvdimm-y += region_devs.o
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libnvdimm-y += region.o
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libnvdimm-y += namespace_devs.o
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libnvdimm-y += label.o
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@ -18,6 +18,7 @@
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/nd.h>
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#include "label.h"
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#include "nd.h"
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static void free_data(struct nvdimm_drvdata *ndd)
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@ -42,6 +43,11 @@ static int nvdimm_probe(struct device *dev)
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return -ENOMEM;
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dev_set_drvdata(dev, ndd);
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ndd->dpa.name = dev_name(dev);
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ndd->ns_current = -1;
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ndd->ns_next = -1;
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ndd->dpa.start = 0;
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ndd->dpa.end = -1;
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ndd->dev = dev;
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rc = nvdimm_init_nsarea(ndd);
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@ -54,6 +60,17 @@ static int nvdimm_probe(struct device *dev)
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dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
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nvdimm_bus_lock(dev);
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ndd->ns_current = nd_label_validate(ndd);
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ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
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nd_label_copy(ndd, to_next_namespace_index(ndd),
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to_current_namespace_index(ndd));
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rc = nd_label_reserve_dpa(ndd);
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nvdimm_bus_unlock(dev);
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if (rc)
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goto err;
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return 0;
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err:
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@ -64,7 +81,13 @@ static int nvdimm_probe(struct device *dev)
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static int nvdimm_remove(struct device *dev)
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{
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struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
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struct resource *res, *_r;
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nvdimm_bus_lock(dev);
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dev_set_drvdata(dev, NULL);
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for_each_dpa_resource_safe(ndd, res, _r)
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nvdimm_free_dpa(ndd, res);
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nvdimm_bus_unlock(dev);
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free_data(ndd);
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return 0;
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@ -92,8 +92,12 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
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if (ndd->data)
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return 0;
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if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0)
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if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
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|| ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
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dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
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ndd->nsarea.max_xfer, ndd->nsarea.config_size);
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return -ENXIO;
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}
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ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
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if (!ndd->data)
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@ -243,6 +247,30 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
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}
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EXPORT_SYMBOL_GPL(nvdimm_create);
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void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
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{
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WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
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kfree(res->name);
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__release_region(&ndd->dpa, res->start, resource_size(res));
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}
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struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
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struct nd_label_id *label_id, resource_size_t start,
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resource_size_t n)
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{
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char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
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struct resource *res;
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if (!name)
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return NULL;
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WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
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res = __request_region(&ndd->dpa, start, n, name, 0);
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if (!res)
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kfree(name);
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return res;
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}
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static int count_dimms(struct device *dev, void *c)
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{
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int *count = c;
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290
drivers/nvdimm/label.c
Normal file
290
drivers/nvdimm/label.c
Normal file
@ -0,0 +1,290 @@
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/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/ndctl.h>
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#include <linux/io.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "label.h"
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#include "nd.h"
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static u32 best_seq(u32 a, u32 b)
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{
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a &= NSINDEX_SEQ_MASK;
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b &= NSINDEX_SEQ_MASK;
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if (a == 0 || a == b)
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return b;
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else if (b == 0)
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return a;
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else if (nd_inc_seq(a) == b)
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return b;
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else
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return a;
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}
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size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
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{
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u32 index_span;
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if (ndd->nsindex_size)
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return ndd->nsindex_size;
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/*
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* The minimum index space is 512 bytes, with that amount of
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* index we can describe ~1400 labels which is less than a byte
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* of overhead per label. Round up to a byte of overhead per
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* label and determine the size of the index region. Yes, this
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* starts to waste space at larger config_sizes, but it's
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* unlikely we'll ever see anything but 128K.
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*/
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index_span = ndd->nsarea.config_size / 129;
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index_span /= NSINDEX_ALIGN * 2;
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ndd->nsindex_size = index_span * NSINDEX_ALIGN;
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return ndd->nsindex_size;
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}
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int nd_label_validate(struct nvdimm_drvdata *ndd)
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{
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/*
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* On media label format consists of two index blocks followed
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* by an array of labels. None of these structures are ever
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* updated in place. A sequence number tracks the current
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* active index and the next one to write, while labels are
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* written to free slots.
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*
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* +------------+
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* | |
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* | nsindex0 |
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* | |
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* +------------+
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* | |
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* | nsindex1 |
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* | |
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* +------------+
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* | label0 |
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* +------------+
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* | label1 |
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* +------------+
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* | |
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* ....nslot...
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* | |
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* +------------+
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* | labelN |
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* +------------+
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*/
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struct nd_namespace_index *nsindex[] = {
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to_namespace_index(ndd, 0),
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to_namespace_index(ndd, 1),
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};
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const int num_index = ARRAY_SIZE(nsindex);
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struct device *dev = ndd->dev;
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bool valid[2] = { 0 };
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int i, num_valid = 0;
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u32 seq;
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for (i = 0; i < num_index; i++) {
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u32 nslot;
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u8 sig[NSINDEX_SIG_LEN];
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u64 sum_save, sum, size;
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memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
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if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
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dev_dbg(dev, "%s: nsindex%d signature invalid\n",
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__func__, i);
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continue;
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}
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sum_save = __le64_to_cpu(nsindex[i]->checksum);
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nsindex[i]->checksum = __cpu_to_le64(0);
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sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
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nsindex[i]->checksum = __cpu_to_le64(sum_save);
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if (sum != sum_save) {
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dev_dbg(dev, "%s: nsindex%d checksum invalid\n",
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__func__, i);
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continue;
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}
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seq = __le32_to_cpu(nsindex[i]->seq);
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if ((seq & NSINDEX_SEQ_MASK) == 0) {
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dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n",
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__func__, i, seq);
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continue;
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}
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/* sanity check the index against expected values */
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if (__le64_to_cpu(nsindex[i]->myoff)
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!= i * sizeof_namespace_index(ndd)) {
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dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n",
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__func__, i, (unsigned long long)
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__le64_to_cpu(nsindex[i]->myoff));
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continue;
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}
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if (__le64_to_cpu(nsindex[i]->otheroff)
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!= (!i) * sizeof_namespace_index(ndd)) {
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dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n",
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__func__, i, (unsigned long long)
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__le64_to_cpu(nsindex[i]->otheroff));
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continue;
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}
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size = __le64_to_cpu(nsindex[i]->mysize);
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if (size > sizeof_namespace_index(ndd)
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|| size < sizeof(struct nd_namespace_index)) {
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dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n",
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__func__, i, size);
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continue;
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}
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nslot = __le32_to_cpu(nsindex[i]->nslot);
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if (nslot * sizeof(struct nd_namespace_label)
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+ 2 * sizeof_namespace_index(ndd)
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> ndd->nsarea.config_size) {
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dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n",
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__func__, i, nslot,
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ndd->nsarea.config_size);
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continue;
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}
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valid[i] = true;
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num_valid++;
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}
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switch (num_valid) {
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case 0:
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break;
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case 1:
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for (i = 0; i < num_index; i++)
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if (valid[i])
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return i;
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/* can't have num_valid > 0 but valid[] = { false, false } */
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WARN_ON(1);
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break;
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default:
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/* pick the best index... */
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seq = best_seq(__le32_to_cpu(nsindex[0]->seq),
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__le32_to_cpu(nsindex[1]->seq));
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if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK))
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return 1;
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else
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return 0;
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break;
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}
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return -1;
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}
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void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
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struct nd_namespace_index *src)
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{
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if (dst && src)
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/* pass */;
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else
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return;
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memcpy(dst, src, sizeof_namespace_index(ndd));
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}
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static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
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{
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void *base = to_namespace_index(ndd, 0);
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return base + 2 * sizeof_namespace_index(ndd);
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}
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#define for_each_clear_bit_le(bit, addr, size) \
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for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
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(bit) < (size); \
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(bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
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/**
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* preamble_current - common variable initialization for nd_label_* routines
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* @ndd: dimm container for the relevant label set
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* @nsindex_out: on return set to the currently active namespace index
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* @free: on return set to the free label bitmap in the index
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* @nslot: on return set to the number of slots in the label space
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*/
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static bool preamble_current(struct nvdimm_drvdata *ndd,
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struct nd_namespace_index **nsindex_out,
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unsigned long **free, u32 *nslot)
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{
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struct nd_namespace_index *nsindex;
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nsindex = to_current_namespace_index(ndd);
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if (nsindex == NULL)
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return false;
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*free = (unsigned long *) nsindex->free;
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*nslot = __le32_to_cpu(nsindex->nslot);
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*nsindex_out = nsindex;
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return true;
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}
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static char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags)
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{
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if (!label_id || !uuid)
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return NULL;
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snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb",
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flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid);
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return label_id->id;
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}
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static bool slot_valid(struct nd_namespace_label *nd_label, u32 slot)
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{
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/* check that we are written where we expect to be written */
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if (slot != __le32_to_cpu(nd_label->slot))
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return false;
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/* check that DPA allocations are page aligned */
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if ((__le64_to_cpu(nd_label->dpa)
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| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
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return false;
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return true;
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}
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int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
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{
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struct nd_namespace_index *nsindex;
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unsigned long *free;
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u32 nslot, slot;
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if (!preamble_current(ndd, &nsindex, &free, &nslot))
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return 0; /* no label, nothing to reserve */
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for_each_clear_bit_le(slot, free, nslot) {
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struct nd_namespace_label *nd_label;
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struct nd_region *nd_region = NULL;
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u8 label_uuid[NSLABEL_UUID_LEN];
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struct nd_label_id label_id;
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struct resource *res;
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u32 flags;
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nd_label = nd_label_base(ndd) + slot;
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if (!slot_valid(nd_label, slot))
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continue;
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memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
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flags = __le32_to_cpu(nd_label->flags);
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nd_label_gen_id(&label_id, label_uuid, flags);
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res = nvdimm_allocate_dpa(ndd, &label_id,
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__le64_to_cpu(nd_label->dpa),
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__le64_to_cpu(nd_label->rawsize));
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nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
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if (!res)
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return -EBUSY;
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}
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return 0;
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}
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128
drivers/nvdimm/label.h
Normal file
128
drivers/nvdimm/label.h
Normal file
@ -0,0 +1,128 @@
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/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* 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.
|
||||
*/
|
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#ifndef __LABEL_H__
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#define __LABEL_H__
|
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#include <linux/ndctl.h>
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#include <linux/sizes.h>
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#include <linux/io.h>
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enum {
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NSINDEX_SIG_LEN = 16,
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NSINDEX_ALIGN = 256,
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NSINDEX_SEQ_MASK = 0x3,
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NSLABEL_UUID_LEN = 16,
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NSLABEL_NAME_LEN = 64,
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NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
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NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
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NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
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NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
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BTT_ALIGN = 4096, /* all btt structures */
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BTTINFO_SIG_LEN = 16,
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BTTINFO_UUID_LEN = 16,
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BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */
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BTTINFO_MAJOR_VERSION = 1,
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ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
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ND_LABEL_ID_SIZE = 50,
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};
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static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
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/**
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* struct nd_namespace_index - label set superblock
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* @sig: NAMESPACE_INDEX\0
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* @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 nvdimm_drvdata;
|
||||
int nd_label_validate(struct nvdimm_drvdata *ndd);
|
||||
void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
|
||||
struct nd_namespace_index *src);
|
||||
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
|
||||
#endif /* __LABEL_H__ */
|
||||
@ -16,11 +16,15 @@
|
||||
#include <linux/device.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/ndctl.h>
|
||||
#include "label.h"
|
||||
|
||||
struct nvdimm_drvdata {
|
||||
struct device *dev;
|
||||
int nsindex_size;
|
||||
struct nd_cmd_get_config_size nsarea;
|
||||
void *data;
|
||||
int ns_current, ns_next;
|
||||
struct resource dpa;
|
||||
};
|
||||
|
||||
struct nd_region_namespaces {
|
||||
@ -28,6 +32,37 @@ struct nd_region_namespaces {
|
||||
int active;
|
||||
};
|
||||
|
||||
static inline struct nd_namespace_index *to_namespace_index(
|
||||
struct nvdimm_drvdata *ndd, int i)
|
||||
{
|
||||
if (i < 0)
|
||||
return NULL;
|
||||
|
||||
return ndd->data + sizeof_namespace_index(ndd) * i;
|
||||
}
|
||||
|
||||
static inline struct nd_namespace_index *to_current_namespace_index(
|
||||
struct nvdimm_drvdata *ndd)
|
||||
{
|
||||
return to_namespace_index(ndd, ndd->ns_current);
|
||||
}
|
||||
|
||||
static inline struct nd_namespace_index *to_next_namespace_index(
|
||||
struct nvdimm_drvdata *ndd)
|
||||
{
|
||||
return to_namespace_index(ndd, ndd->ns_next);
|
||||
}
|
||||
|
||||
#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;
|
||||
u16 ndr_mappings;
|
||||
@ -39,6 +74,15 @@ 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,
|
||||
@ -58,4 +102,9 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
|
||||
void nvdimm_bus_lock(struct device *dev);
|
||||
void nvdimm_bus_unlock(struct device *dev);
|
||||
bool is_nvdimm_bus_locked(struct device *dev);
|
||||
int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
|
||||
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
|
||||
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
|
||||
struct nd_label_id *label_id, resource_size_t start,
|
||||
resource_size_t n);
|
||||
#endif /* __ND_H__ */
|
||||
|
||||
@ -175,7 +175,6 @@ static inline const char *nvdimm_cmd_name(unsigned cmd)
|
||||
#define ND_IOCTL_ARS_STATUS _IOWR(ND_IOCTL, ND_CMD_ARS_STATUS,\
|
||||
struct nd_cmd_ars_status)
|
||||
|
||||
|
||||
#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_BLK 3 /* nd_region: (parent of BLK namespaces) */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user