linux/drivers/nvdimm/dimm_devs.c
Dan Williams fd14602d05 libnvdimm: Export nvdimm shutdown helper, nvdimm_delete()
CXL is a hotplug bus and arranges for nvdimm devices to be dynamically
discovered and removed. The libnvdimm core manages shutdown of nvdimm
security operations when the device is unregistered. That functionality
is moved to nvdimm_delete() and invoked by the CXL-to-nvdimm glue code.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/162379910271.2993820.2955889139842401250.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2021-06-15 16:47:22 -07:00

1044 lines
25 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/moduleparam.h>
#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);
static bool noblk;
module_param(noblk, bool, 0444);
MODULE_PARM_DESC(noblk, "force disable BLK / local alias support");
/*
* 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_LABELING, &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, "%ps: %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_labeling(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
set_bit(NDD_LABELING, &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);
}
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%s\n",
test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
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 nvdimm_drvdata *ndd, char *buf)
{
struct device *dev;
ssize_t rc;
u32 nfree;
if (!ndd)
return -ENXIO;
dev = ndd->dev;
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 ssize_t available_slots_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
ssize_t rc;
nd_device_lock(dev);
rc = __available_slots_show(dev_get_drvdata(dev), buf);
nd_device_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);
if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
return sprintf(buf, "overwrite\n");
if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
return sprintf(buf, "disabled\n");
if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
return sprintf(buf, "unlocked\n");
if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
return sprintf(buf, "locked\n");
return -ENOTTY;
}
static ssize_t frozen_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
&nvdimm->sec.flags));
}
static DEVICE_ATTR_RO(frozen);
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.
*/
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = nvdimm_security_store(dev, buf, len);
nvdimm_bus_unlock(dev);
nd_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,
&dev_attr_frozen.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 && a != &dev_attr_frozen.attr)
return a->mode;
if (!nvdimm->sec.flags)
return 0;
if (a == &dev_attr_security.attr) {
/* Are there any state mutation ops (make writable)? */
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;
}
if (nvdimm->sec.ops->freeze)
return a->mode;
return 0;
}
static const struct attribute_group nvdimm_attribute_group = {
.attrs = nvdimm_attributes,
.is_visible = nvdimm_visible,
};
static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
enum nvdimm_fwa_result result;
if (!nvdimm->fw_ops)
return -EOPNOTSUPP;
nvdimm_bus_lock(dev);
result = nvdimm->fw_ops->activate_result(nvdimm);
nvdimm_bus_unlock(dev);
switch (result) {
case NVDIMM_FWA_RESULT_NONE:
return sprintf(buf, "none\n");
case NVDIMM_FWA_RESULT_SUCCESS:
return sprintf(buf, "success\n");
case NVDIMM_FWA_RESULT_FAIL:
return sprintf(buf, "fail\n");
case NVDIMM_FWA_RESULT_NOTSTAGED:
return sprintf(buf, "not_staged\n");
case NVDIMM_FWA_RESULT_NEEDRESET:
return sprintf(buf, "need_reset\n");
default:
return -ENXIO;
}
}
static DEVICE_ATTR_ADMIN_RO(result);
static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
enum nvdimm_fwa_state state;
if (!nvdimm->fw_ops)
return -EOPNOTSUPP;
nvdimm_bus_lock(dev);
state = nvdimm->fw_ops->activate_state(nvdimm);
nvdimm_bus_unlock(dev);
switch (state) {
case NVDIMM_FWA_IDLE:
return sprintf(buf, "idle\n");
case NVDIMM_FWA_BUSY:
return sprintf(buf, "busy\n");
case NVDIMM_FWA_ARMED:
return sprintf(buf, "armed\n");
default:
return -ENXIO;
}
}
static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t len)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
enum nvdimm_fwa_trigger arg;
int rc;
if (!nvdimm->fw_ops)
return -EOPNOTSUPP;
if (sysfs_streq(buf, "arm"))
arg = NVDIMM_FWA_ARM;
else if (sysfs_streq(buf, "disarm"))
arg = NVDIMM_FWA_DISARM;
else
return -EINVAL;
nvdimm_bus_lock(dev);
rc = nvdimm->fw_ops->arm(nvdimm, arg);
nvdimm_bus_unlock(dev);
if (rc < 0)
return rc;
return len;
}
static DEVICE_ATTR_ADMIN_RW(activate);
static struct attribute *nvdimm_firmware_attributes[] = {
&dev_attr_activate.attr,
&dev_attr_result.attr,
NULL,
};
static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
{
struct device *dev = container_of(kobj, typeof(*dev), kobj);
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
struct nvdimm *nvdimm = to_nvdimm(dev);
enum nvdimm_fwa_capability cap;
if (!nd_desc->fw_ops)
return 0;
if (!nvdimm->fw_ops)
return 0;
nvdimm_bus_lock(dev);
cap = nd_desc->fw_ops->capability(nd_desc);
nvdimm_bus_unlock(dev);
if (cap < NVDIMM_FWA_CAP_QUIESCE)
return 0;
return a->mode;
}
static const struct attribute_group nvdimm_firmware_attribute_group = {
.name = "firmware",
.attrs = nvdimm_firmware_attributes,
.is_visible = nvdimm_firmware_visible,
};
static const struct attribute_group *nvdimm_attribute_groups[] = {
&nd_device_attribute_group,
&nvdimm_attribute_group,
&nvdimm_firmware_attribute_group,
NULL,
};
static const struct device_type nvdimm_device_type = {
.name = "nvdimm",
.release = nvdimm_release,
.groups = nvdimm_attribute_groups,
};
bool is_nvdimm(struct device *dev)
{
return dev->type == &nvdimm_device_type;
}
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,
const struct nvdimm_fw_ops *fw_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;
if (noblk)
flags |= 1 << NDD_NOBLK;
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->fw_ops = fw_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.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
nd_device_register(dev);
return nvdimm;
}
EXPORT_SYMBOL_GPL(__nvdimm_create);
void nvdimm_delete(struct nvdimm *nvdimm)
{
struct device *dev = &nvdimm->dev;
bool dev_put = false;
/* We are shutting down. Make state frozen artificially. */
nvdimm_bus_lock(dev);
set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
dev_put = true;
nvdimm_bus_unlock(dev);
cancel_delayed_work_sync(&nvdimm->dwork);
if (dev_put)
put_device(dev);
nd_device_unregister(dev, ND_SYNC);
}
EXPORT_SYMBOL_GPL(nvdimm_delete);
static void shutdown_security_notify(void *data)
{
struct nvdimm *nvdimm = data;
sysfs_put(nvdimm->sec.overwrite_state);
}
int nvdimm_security_setup_events(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);
if (!nvdimm->sec.flags || !nvdimm->sec.ops
|| !nvdimm->sec.ops->overwrite)
return 0;
nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
if (!nvdimm->sec.overwrite_state)
return -ENOMEM;
return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
}
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.flags)
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.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
return rc;
}
static unsigned long dpa_align(struct nd_region *nd_region)
{
struct device *dev = &nd_region->dev;
if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
"bus lock required for capacity provision\n"))
return 0;
if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
% nd_region->ndr_mappings,
"invalid region align %#lx mappings: %d\n",
nd_region->align, nd_region->ndr_mappings))
return 0;
return nd_region->align / nd_region->ndr_mappings;
}
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;
unsigned long align;
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.
*/
align = dpa_align(nd_region);
if (!align)
return 0;
for_each_dpa_resource(ndd, res) {
resource_size_t start, end;
if (strncmp(res->name, "pmem", 4) != 0)
continue;
start = ALIGN_DOWN(res->start, align);
end = ALIGN(res->end + 1, align) - 1;
if ((start >= blk_start && start < map_end)
|| (end >= blk_start && end <= map_end)) {
new = max(blk_start, min(map_end, 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;
unsigned long align;
if (!ndd)
return 0;
device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
/* now account for busy blk allocations in unaliased dpa */
align = dpa_align(nd_region);
if (!align)
return 0;
for_each_dpa_resource(ndd, res) {
resource_size_t start, end, size;
if (strncmp(res->name, "blk", 3) != 0)
continue;
start = ALIGN_DOWN(res->start, align);
end = ALIGN(res->end + 1, align) - 1;
size = end - start + 1;
if (size >= info.available)
return 0;
info.available -= size;
}
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;
unsigned long align;
/* if a dimm is disabled the available capacity is zero */
if (!ndd)
return 0;
align = dpa_align(nd_region);
if (!align)
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) {
resource_size_t start, end;
if (strcmp(res->name, "pmem-reserve") != 0)
continue;
/* trim free space relative to current alignment setting */
start = ALIGN(res->start, align);
end = ALIGN_DOWN(res->end + 1, align) - 1;
if (end < start)
continue;
if (end - start + 1 > max)
max = end - start + 1;
}
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;
unsigned long align;
if (!ndd)
return 0;
align = dpa_align(nd_region);
if (!align)
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) {
resource_size_t start, end;
start = ALIGN_DOWN(res->start, align);
end = ALIGN(res->end + 1, align) - 1;
if (start >= map_start && start < map_end) {
if (strncmp(res->name, "blk", 3) == 0)
blk_start = min(blk_start,
max(map_start, start));
else if (end > map_end) {
reason = "misaligned to iset";
goto err;
} else
busy += end - start + 1;
} else if (end >= map_start && 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 += end - start + 1;
} else if (map_start > start && map_start < 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 ALIGN_DOWN(available - busy, align);
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);
}