linux/drivers/nvdimm/dimm_devs.c
Dave Jiang 3c13e2ac74 tools/testing/nvdimm: Add test support for Intel nvdimm security DSMs
Add nfit_test support for DSM functions "Get Security State",
"Set Passphrase", "Disable Passphrase", "Unlock Unit", "Freeze Lock",
and "Secure Erase" for the fake DIMMs.

Also adding a sysfs knob in order to put the DIMMs in "locked" state. The
order of testing DIMM unlocking would be.
1a. Disable DIMM X.
1b. Set Passphrase to DIMM X.
2. Write to
/sys/devices/platform/nfit_test.0/nfit_test_dimm/test_dimmX/lock_dimm
3. Renable DIMM X
4. Check DIMM X state via sysfs "security" attribute for nmemX.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2018-12-21 12:44:41 -08:00

894 lines
22 KiB
C

/*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/ndctl.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "label.h"
#include "pmem.h"
#include "nd.h"
static DEFINE_IDA(dimm_ida);
/*
* Retrieve bus and dimm handle and return if this bus supports
* get_config_data commands
*/
int nvdimm_check_config_data(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
if (!nvdimm->cmd_mask ||
!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
if (test_bit(NDD_ALIASING, &nvdimm->flags))
return -ENXIO;
else
return -ENOTTY;
}
return 0;
}
static int validate_dimm(struct nvdimm_drvdata *ndd)
{
int rc;
if (!ndd)
return -EINVAL;
rc = nvdimm_check_config_data(ndd->dev);
if (rc)
dev_dbg(ndd->dev, "%pf: %s error: %d\n",
__builtin_return_address(0), __func__, rc);
return rc;
}
/**
* nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
* @nvdimm: dimm to initialize
*/
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
{
struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc;
int rc = validate_dimm(ndd);
int cmd_rc = 0;
if (rc)
return rc;
if (cmd->config_size)
return 0; /* already valid */
memset(cmd, 0, sizeof(*cmd));
nd_desc = nvdimm_bus->nd_desc;
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
if (rc < 0)
return rc;
return cmd_rc;
}
int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
size_t offset, size_t len)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
int rc = validate_dimm(ndd), cmd_rc = 0;
struct nd_cmd_get_config_data_hdr *cmd;
size_t max_cmd_size, buf_offset;
if (rc)
return rc;
if (offset + len > ndd->nsarea.config_size)
return -ENXIO;
max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
for (buf_offset = 0; len;
len -= cmd->in_length, buf_offset += cmd->in_length) {
size_t cmd_size;
cmd->in_offset = offset + buf_offset;
cmd->in_length = min(max_cmd_size, len);
cmd_size = sizeof(*cmd) + cmd->in_length;
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
if (rc < 0)
break;
if (cmd_rc < 0) {
rc = cmd_rc;
break;
}
/* out_buf should be valid, copy it into our output buffer */
memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
}
kvfree(cmd);
return rc;
}
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
void *buf, size_t len)
{
size_t max_cmd_size, buf_offset;
struct nd_cmd_set_config_hdr *cmd;
int rc = validate_dimm(ndd), cmd_rc = 0;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
if (rc)
return rc;
if (offset + len > ndd->nsarea.config_size)
return -ENXIO;
max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
for (buf_offset = 0; len; len -= cmd->in_length,
buf_offset += cmd->in_length) {
size_t cmd_size;
cmd->in_offset = offset + buf_offset;
cmd->in_length = min(max_cmd_size, len);
memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
/* status is output in the last 4-bytes of the command buffer */
cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
if (rc < 0)
break;
if (cmd_rc < 0) {
rc = cmd_rc;
break;
}
}
kvfree(cmd);
return rc;
}
void nvdimm_set_aliasing(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
set_bit(NDD_ALIASING, &nvdimm->flags);
}
void nvdimm_set_locked(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
set_bit(NDD_LOCKED, &nvdimm->flags);
}
void nvdimm_clear_locked(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
clear_bit(NDD_LOCKED, &nvdimm->flags);
}
static void nvdimm_release(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
ida_simple_remove(&dimm_ida, nvdimm->id);
kfree(nvdimm);
}
static struct device_type nvdimm_device_type = {
.name = "nvdimm",
.release = nvdimm_release,
};
bool is_nvdimm(struct device *dev)
{
return dev->type == &nvdimm_device_type;
}
struct nvdimm *to_nvdimm(struct device *dev)
{
struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
WARN_ON(!is_nvdimm(dev));
return nvdimm;
}
EXPORT_SYMBOL_GPL(to_nvdimm);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
{
struct nd_region *nd_region = &ndbr->nd_region;
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
return nd_mapping->nvdimm;
}
EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr)
{
/* pmem mapping properties are private to libnvdimm */
return ARCH_MEMREMAP_PMEM;
}
EXPORT_SYMBOL_GPL(nd_blk_memremap_flags);
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
{
struct nvdimm *nvdimm = nd_mapping->nvdimm;
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
return dev_get_drvdata(&nvdimm->dev);
}
EXPORT_SYMBOL(to_ndd);
void nvdimm_drvdata_release(struct kref *kref)
{
struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
struct device *dev = ndd->dev;
struct resource *res, *_r;
dev_dbg(dev, "trace\n");
nvdimm_bus_lock(dev);
for_each_dpa_resource_safe(ndd, res, _r)
nvdimm_free_dpa(ndd, res);
nvdimm_bus_unlock(dev);
kvfree(ndd->data);
kfree(ndd);
put_device(dev);
}
void get_ndd(struct nvdimm_drvdata *ndd)
{
kref_get(&ndd->kref);
}
void put_ndd(struct nvdimm_drvdata *ndd)
{
if (ndd)
kref_put(&ndd->kref, nvdimm_drvdata_release);
}
const char *nvdimm_name(struct nvdimm *nvdimm)
{
return dev_name(&nvdimm->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_name);
struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
{
return &nvdimm->dev.kobj;
}
EXPORT_SYMBOL_GPL(nvdimm_kobj);
unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
{
return nvdimm->cmd_mask;
}
EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
void *nvdimm_provider_data(struct nvdimm *nvdimm)
{
if (nvdimm)
return nvdimm->provider_data;
return NULL;
}
EXPORT_SYMBOL_GPL(nvdimm_provider_data);
static ssize_t commands_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
int cmd, len = 0;
if (!nvdimm->cmd_mask)
return sprintf(buf, "\n");
for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
len += sprintf(buf + len, "\n");
return len;
}
static DEVICE_ATTR_RO(commands);
static ssize_t flags_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
return sprintf(buf, "%s%s\n",
test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
}
static DEVICE_ATTR_RO(flags);
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
/*
* The state may be in the process of changing, userspace should
* quiesce probing if it wants a static answer
*/
nvdimm_bus_lock(dev);
nvdimm_bus_unlock(dev);
return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
? "active" : "idle");
}
static DEVICE_ATTR_RO(state);
static ssize_t available_slots_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
ssize_t rc;
u32 nfree;
if (!ndd)
return -ENXIO;
nvdimm_bus_lock(dev);
nfree = nd_label_nfree(ndd);
if (nfree - 1 > nfree) {
dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
nfree = 0;
} else
nfree--;
rc = sprintf(buf, "%d\n", nfree);
nvdimm_bus_unlock(dev);
return rc;
}
static DEVICE_ATTR_RO(available_slots);
__weak ssize_t security_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
switch (nvdimm->sec.state) {
case NVDIMM_SECURITY_DISABLED:
return sprintf(buf, "disabled\n");
case NVDIMM_SECURITY_UNLOCKED:
return sprintf(buf, "unlocked\n");
case NVDIMM_SECURITY_LOCKED:
return sprintf(buf, "locked\n");
case NVDIMM_SECURITY_FROZEN:
return sprintf(buf, "frozen\n");
case NVDIMM_SECURITY_OVERWRITE:
return sprintf(buf, "overwrite\n");
default:
return -ENOTTY;
}
return -ENOTTY;
}
#define OPS \
C( OP_FREEZE, "freeze", 1), \
C( OP_DISABLE, "disable", 2), \
C( OP_UPDATE, "update", 3), \
C( OP_ERASE, "erase", 2), \
C( OP_OVERWRITE, "overwrite", 2), \
C( OP_MASTER_UPDATE, "master_update", 3), \
C( OP_MASTER_ERASE, "master_erase", 2)
#undef C
#define C(a, b, c) a
enum nvdimmsec_op_ids { OPS };
#undef C
#define C(a, b, c) { b, c }
static struct {
const char *name;
int args;
} ops[] = { OPS };
#undef C
#define SEC_CMD_SIZE 32
#define KEY_ID_SIZE 10
static ssize_t __security_store(struct device *dev, const char *buf, size_t len)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
ssize_t rc;
char cmd[SEC_CMD_SIZE+1], keystr[KEY_ID_SIZE+1],
nkeystr[KEY_ID_SIZE+1];
unsigned int key, newkey;
int i;
if (atomic_read(&nvdimm->busy))
return -EBUSY;
rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s"
" %"__stringify(KEY_ID_SIZE)"s"
" %"__stringify(KEY_ID_SIZE)"s",
cmd, keystr, nkeystr);
if (rc < 1)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ops); i++)
if (sysfs_streq(cmd, ops[i].name))
break;
if (i >= ARRAY_SIZE(ops))
return -EINVAL;
if (ops[i].args > 1)
rc = kstrtouint(keystr, 0, &key);
if (rc >= 0 && ops[i].args > 2)
rc = kstrtouint(nkeystr, 0, &newkey);
if (rc < 0)
return rc;
if (i == OP_FREEZE) {
dev_dbg(dev, "freeze\n");
rc = nvdimm_security_freeze(nvdimm);
} else if (i == OP_DISABLE) {
dev_dbg(dev, "disable %u\n", key);
rc = nvdimm_security_disable(nvdimm, key);
} else if (i == OP_UPDATE) {
dev_dbg(dev, "update %u %u\n", key, newkey);
rc = nvdimm_security_update(nvdimm, key, newkey, NVDIMM_USER);
} else if (i == OP_ERASE) {
dev_dbg(dev, "erase %u\n", key);
rc = nvdimm_security_erase(nvdimm, key, NVDIMM_USER);
} else if (i == OP_OVERWRITE) {
dev_dbg(dev, "overwrite %u\n", key);
rc = nvdimm_security_overwrite(nvdimm, key);
} else if (i == OP_MASTER_UPDATE) {
dev_dbg(dev, "master_update %u %u\n", key, newkey);
rc = nvdimm_security_update(nvdimm, key, newkey,
NVDIMM_MASTER);
} else if (i == OP_MASTER_ERASE) {
dev_dbg(dev, "master_erase %u\n", key);
rc = nvdimm_security_erase(nvdimm, key,
NVDIMM_MASTER);
} else
return -EINVAL;
if (rc == 0)
rc = len;
return rc;
}
static ssize_t security_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
ssize_t rc;
/*
* Require all userspace triggered security management to be
* done while probing is idle and the DIMM is not in active use
* in any region.
*/
device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __security_store(dev, buf, len);
nvdimm_bus_unlock(dev);
device_unlock(dev);
return rc;
}
static DEVICE_ATTR_RW(security);
static struct attribute *nvdimm_attributes[] = {
&dev_attr_state.attr,
&dev_attr_flags.attr,
&dev_attr_commands.attr,
&dev_attr_available_slots.attr,
&dev_attr_security.attr,
NULL,
};
static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
{
struct device *dev = container_of(kobj, typeof(*dev), kobj);
struct nvdimm *nvdimm = to_nvdimm(dev);
if (a != &dev_attr_security.attr)
return a->mode;
if (nvdimm->sec.state < 0)
return 0;
/* Are there any state mutation ops? */
if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
|| nvdimm->sec.ops->change_key
|| nvdimm->sec.ops->erase
|| nvdimm->sec.ops->overwrite)
return a->mode;
return 0444;
}
struct attribute_group nvdimm_attribute_group = {
.attrs = nvdimm_attributes,
.is_visible = nvdimm_visible,
};
EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
void *provider_data, const struct attribute_group **groups,
unsigned long flags, unsigned long cmd_mask, int num_flush,
struct resource *flush_wpq, const char *dimm_id,
const struct nvdimm_security_ops *sec_ops)
{
struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
struct device *dev;
if (!nvdimm)
return NULL;
nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
if (nvdimm->id < 0) {
kfree(nvdimm);
return NULL;
}
nvdimm->dimm_id = dimm_id;
nvdimm->provider_data = provider_data;
nvdimm->flags = flags;
nvdimm->cmd_mask = cmd_mask;
nvdimm->num_flush = num_flush;
nvdimm->flush_wpq = flush_wpq;
atomic_set(&nvdimm->busy, 0);
dev = &nvdimm->dev;
dev_set_name(dev, "nmem%d", nvdimm->id);
dev->parent = &nvdimm_bus->dev;
dev->type = &nvdimm_device_type;
dev->devt = MKDEV(nvdimm_major, nvdimm->id);
dev->groups = groups;
nvdimm->sec.ops = sec_ops;
nvdimm->sec.overwrite_tmo = 0;
INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
/*
* Security state must be initialized before device_add() for
* attribute visibility.
*/
/* get security state and extended (master) state */
nvdimm->sec.state = nvdimm_security_state(nvdimm, NVDIMM_USER);
nvdimm->sec.ext_state = nvdimm_security_state(nvdimm, NVDIMM_MASTER);
nd_device_register(dev);
return nvdimm;
}
EXPORT_SYMBOL_GPL(__nvdimm_create);
int nvdimm_security_setup_events(struct nvdimm *nvdimm)
{
nvdimm->sec.overwrite_state = sysfs_get_dirent(nvdimm->dev.kobj.sd,
"security");
if (!nvdimm->sec.overwrite_state)
return -ENODEV;
return 0;
}
EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
int nvdimm_in_overwrite(struct nvdimm *nvdimm)
{
return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
}
EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
int nvdimm_security_freeze(struct nvdimm *nvdimm)
{
int rc;
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
return -EOPNOTSUPP;
if (nvdimm->sec.state < 0)
return -EIO;
if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
return -EBUSY;
}
rc = nvdimm->sec.ops->freeze(nvdimm);
nvdimm->sec.state = nvdimm_security_state(nvdimm, NVDIMM_USER);
return rc;
}
int alias_dpa_busy(struct device *dev, void *data)
{
resource_size_t map_end, blk_start, new;
struct blk_alloc_info *info = data;
struct nd_mapping *nd_mapping;
struct nd_region *nd_region;
struct nvdimm_drvdata *ndd;
struct resource *res;
int i;
if (!is_memory(dev))
return 0;
nd_region = to_nd_region(dev);
for (i = 0; i < nd_region->ndr_mappings; i++) {
nd_mapping = &nd_region->mapping[i];
if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
break;
}
if (i >= nd_region->ndr_mappings)
return 0;
ndd = to_ndd(nd_mapping);
map_end = nd_mapping->start + nd_mapping->size - 1;
blk_start = nd_mapping->start;
/*
* In the allocation case ->res is set to free space that we are
* looking to validate against PMEM aliasing collision rules
* (i.e. BLK is allocated after all aliased PMEM).
*/
if (info->res) {
if (info->res->start >= nd_mapping->start
&& info->res->start < map_end)
/* pass */;
else
return 0;
}
retry:
/*
* Find the free dpa from the end of the last pmem allocation to
* the end of the interleave-set mapping.
*/
for_each_dpa_resource(ndd, res) {
if (strncmp(res->name, "pmem", 4) != 0)
continue;
if ((res->start >= blk_start && res->start < map_end)
|| (res->end >= blk_start
&& res->end <= map_end)) {
new = max(blk_start, min(map_end + 1, res->end + 1));
if (new != blk_start) {
blk_start = new;
goto retry;
}
}
}
/* update the free space range with the probed blk_start */
if (info->res && blk_start > info->res->start) {
info->res->start = max(info->res->start, blk_start);
if (info->res->start > info->res->end)
info->res->end = info->res->start - 1;
return 1;
}
info->available -= blk_start - nd_mapping->start;
return 0;
}
/**
* nd_blk_available_dpa - account the unused dpa of BLK region
* @nd_mapping: container of dpa-resource-root + labels
*
* Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but
* we arrange for them to never start at an lower dpa than the last
* PMEM allocation in an aliased region.
*/
resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct blk_alloc_info info = {
.nd_mapping = nd_mapping,
.available = nd_mapping->size,
.res = NULL,
};
struct resource *res;
if (!ndd)
return 0;
device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
/* now account for busy blk allocations in unaliased dpa */
for_each_dpa_resource(ndd, res) {
if (strncmp(res->name, "blk", 3) != 0)
continue;
info.available -= resource_size(res);
}
return info.available;
}
/**
* nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
* contiguous unallocated dpa range.
* @nd_region: constrain available space check to this reference region
* @nd_mapping: container of dpa-resource-root + labels
*/
resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nvdimm_bus *nvdimm_bus;
resource_size_t max = 0;
struct resource *res;
/* if a dimm is disabled the available capacity is zero */
if (!ndd)
return 0;
nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
return 0;
for_each_dpa_resource(ndd, res) {
if (strcmp(res->name, "pmem-reserve") != 0)
continue;
if (resource_size(res) > max)
max = resource_size(res);
}
release_free_pmem(nvdimm_bus, nd_mapping);
return max;
}
/**
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
* @nd_mapping: container of dpa-resource-root + labels
* @nd_region: constrain available space check to this reference region
* @overlap: calculate available space assuming this level of overlap
*
* Validate that a PMEM label, if present, aligns with the start of an
* interleave set and truncate the available size at the lowest BLK
* overlap point.
*
* The expectation is that this routine is called multiple times as it
* probes for the largest BLK encroachment for any single member DIMM of
* the interleave set. Once that value is determined the PMEM-limit for
* the set can be established.
*/
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, resource_size_t *overlap)
{
resource_size_t map_start, map_end, busy = 0, available, blk_start;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct resource *res;
const char *reason;
if (!ndd)
return 0;
map_start = nd_mapping->start;
map_end = map_start + nd_mapping->size - 1;
blk_start = max(map_start, map_end + 1 - *overlap);
for_each_dpa_resource(ndd, res) {
if (res->start >= map_start && res->start < map_end) {
if (strncmp(res->name, "blk", 3) == 0)
blk_start = min(blk_start,
max(map_start, res->start));
else if (res->end > map_end) {
reason = "misaligned to iset";
goto err;
} else
busy += resource_size(res);
} else if (res->end >= map_start && res->end <= map_end) {
if (strncmp(res->name, "blk", 3) == 0) {
/*
* If a BLK allocation overlaps the start of
* PMEM the entire interleave set may now only
* be used for BLK.
*/
blk_start = map_start;
} else
busy += resource_size(res);
} else if (map_start > res->start && map_start < res->end) {
/* total eclipse of the mapping */
busy += nd_mapping->size;
blk_start = map_start;
}
}
*overlap = map_end + 1 - blk_start;
available = blk_start - map_start;
if (busy < available)
return available - busy;
return 0;
err:
nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
return 0;
}
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
{
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
kfree(res->name);
__release_region(&ndd->dpa, res->start, resource_size(res));
}
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id, resource_size_t start,
resource_size_t n)
{
char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
struct resource *res;
if (!name)
return NULL;
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
res = __request_region(&ndd->dpa, start, n, name, 0);
if (!res)
kfree(name);
return res;
}
/**
* nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
* @nvdimm: container of dpa-resource-root + labels
* @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
*/
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id)
{
resource_size_t allocated = 0;
struct resource *res;
for_each_dpa_resource(ndd, res)
if (strcmp(res->name, label_id->id) == 0)
allocated += resource_size(res);
return allocated;
}
static int count_dimms(struct device *dev, void *c)
{
int *count = c;
if (is_nvdimm(dev))
(*count)++;
return 0;
}
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
{
int count = 0;
/* Flush any possible dimm registration failures */
nd_synchronize();
device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
if (count != dimm_count)
return -ENXIO;
return 0;
}
EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
void __exit nvdimm_devs_exit(void)
{
ida_destroy(&dimm_ida);
}