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libnvdimm fixes v5.3-rc2 

- Fix duplicate device_unregister() calls (multiple threads competing to
   do unregister work when scheduling device removal from a sysfs attribute
   of the self-same device).
 
 - Fix badblocks registration order bug. Ensure region badblocks are
   initialized in advance of namespace registration.
 
 - Fix a deadlock between the bus lock and probe operations.
 
 - Export device-core infrastructure to coordinate async operations via
   the device ->dead state.
 
 - Add device-core infrastructure to validate device_lock() usage with
   lockdep.
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Merge tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:
 "A collection of locking and async operations fixes for v5.3-rc2. These
  had been soaking in a branch targeting the merge window, but missed
  due to a regression hunt. This fixed up version has otherwise been in
  -next this past week with no reported issues.

  In order to gain confidence in the locking changes the pull also
  includes a debug / instrumentation patch to enable lockdep coverage
  for libnvdimm subsystem operations that depend on the device_lock for
  exclusion. As mentioned in the changelog it is a hack, but it works
  and documents the locking expectations of the sub-system in a way that
  others can use lockdep to verify. The driver core touches got an ack
  from Greg.

  Summary:

   - Fix duplicate device_unregister() calls (multiple threads competing
     to do unregister work when scheduling device removal from a sysfs
     attribute of the self-same device).

   - Fix badblocks registration order bug. Ensure region badblocks are
     initialized in advance of namespace registration.

   - Fix a deadlock between the bus lock and probe operations.

   - Export device-core infrastructure to coordinate async operations
     via the device ->dead state.

   - Add device-core infrastructure to validate device_lock() usage with
     lockdep"

* tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  driver-core, libnvdimm: Let device subsystems add local lockdep coverage
  libnvdimm/bus: Fix wait_nvdimm_bus_probe_idle() ABBA deadlock
  libnvdimm/bus: Stop holding nvdimm_bus_list_mutex over __nd_ioctl()
  libnvdimm/bus: Prepare the nd_ioctl() path to be re-entrant
  libnvdimm/region: Register badblocks before namespaces
  libnvdimm/bus: Prevent duplicate device_unregister() calls
  drivers/base: Introduce kill_device()
This commit is contained in:
Linus Torvalds 2019-07-27 08:25:51 -07:00
parent 5168afe6ef 87a30e1f05
commit 523634db14
14 changed files with 342 additions and 155 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/acpi/nfit/core.c
View File

@ -1282,7 +1282,7 @@ static ssize_t hw_error_scrub_store(struct device *dev,
if (rc)
return rc;
device_lock(dev);
nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev);
if (nd_desc) {
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
@ -1299,7 +1299,7 @@ static ssize_t hw_error_scrub_store(struct device *dev,
break;
}
}
device_unlock(dev);
nfit_device_unlock(dev);
if (rc)
return rc;
return size;
@ -1319,7 +1319,7 @@ static ssize_t scrub_show(struct device *dev,
ssize_t rc = -ENXIO;
bool busy;
device_lock(dev);
nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev);
if (!nd_desc) {
device_unlock(dev);
@ -1339,7 +1339,7 @@ static ssize_t scrub_show(struct device *dev,
}
mutex_unlock(&acpi_desc->init_mutex);
device_unlock(dev);
nfit_device_unlock(dev);
return rc;
}
@ -1356,14 +1356,14 @@ static ssize_t scrub_store(struct device *dev,
if (val != 1)
return -EINVAL;
device_lock(dev);
nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev);
if (nd_desc) {
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
rc = acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG);
}
device_unlock(dev);
nfit_device_unlock(dev);
if (rc)
return rc;
return size;
@ -1749,9 +1749,9 @@ static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
struct acpi_device *adev = data;
struct device *dev = &adev->dev;
device_lock(dev->parent);
nfit_device_lock(dev->parent);
__acpi_nvdimm_notify(dev, event);
device_unlock(dev->parent);
nfit_device_unlock(dev->parent);
}
static bool acpi_nvdimm_has_method(struct acpi_device *adev, char *method)
@ -3457,8 +3457,8 @@ static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc)
struct device *dev = acpi_desc->dev;
/* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
device_lock(dev);
device_unlock(dev);
nfit_device_lock(dev);
nfit_device_unlock(dev);
/* Bounce the init_mutex to complete initial registration */
mutex_lock(&acpi_desc->init_mutex);
@ -3602,8 +3602,8 @@ void acpi_nfit_shutdown(void *data)
* acpi_nfit_ars_rescan() submissions have had a chance to
* either submit or see ->cancel set.
*/
device_lock(bus_dev);
device_unlock(bus_dev);
nfit_device_lock(bus_dev);
nfit_device_unlock(bus_dev);
flush_workqueue(nfit_wq);
}
@ -3746,9 +3746,9 @@ EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
{
device_lock(&adev->dev);
nfit_device_lock(&adev->dev);
__acpi_nfit_notify(&adev->dev, adev->handle, event);
device_unlock(&adev->dev);
nfit_device_unlock(&adev->dev);
}
static const struct acpi_device_id acpi_nfit_ids[] = {

24
drivers/acpi/nfit/nfit.h
View File

@ -312,6 +312,30 @@ static inline struct acpi_nfit_desc *to_acpi_desc(
return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
}
#ifdef CONFIG_PROVE_LOCKING
static inline void nfit_device_lock(struct device *dev)
{
device_lock(dev);
mutex_lock(&dev->lockdep_mutex);
}
static inline void nfit_device_unlock(struct device *dev)
{
mutex_unlock(&dev->lockdep_mutex);
device_unlock(dev);
}
#else
static inline void nfit_device_lock(struct device *dev)
{
device_lock(dev);
}
static inline void nfit_device_unlock(struct device *dev)
{
device_unlock(dev);
}
#endif
const guid_t *to_nfit_uuid(enum nfit_uuids id);
int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *nfit, acpi_size sz);
void acpi_nfit_shutdown(void *data);

30
drivers/base/core.c
View File

@ -1663,6 +1663,9 @@ void device_initialize(struct device *dev)
kobject_init(&dev->kobj, &device_ktype);
INIT_LIST_HEAD(&dev->dma_pools);
mutex_init(&dev->mutex);
#ifdef CONFIG_PROVE_LOCKING
mutex_init(&dev->lockdep_mutex);
#endif
lockdep_set_novalidate_class(&dev->mutex);
spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head);
@ -2211,6 +2214,24 @@ void put_device(struct device *dev)
}
EXPORT_SYMBOL_GPL(put_device);
bool kill_device(struct device *dev)
{
/*
* Require the device lock and set the "dead" flag to guarantee that
* the update behavior is consistent with the other bitfields near
* it and that we cannot have an asynchronous probe routine trying
* to run while we are tearing out the bus/class/sysfs from
* underneath the device.
*/
lockdep_assert_held(&dev->mutex);
if (dev->p->dead)
return false;
dev->p->dead = true;
return true;
}
EXPORT_SYMBOL_GPL(kill_device);
/**
* device_del - delete device from system.
* @dev: device.
@ -2230,15 +2251,8 @@ void device_del(struct device *dev)
struct kobject *glue_dir = NULL;
struct class_interface *class_intf;
/*
* Hold the device lock and set the "dead" flag to guarantee that
* the update behavior is consistent with the other bitfields near
* it and that we cannot have an asynchronous probe routine trying
* to run while we are tearing out the bus/class/sysfs from
* underneath the device.
*/
device_lock(dev);
dev->p->dead = true;
kill_device(dev);
device_unlock(dev);
/* Notify clients of device removal. This call must come

16
drivers/nvdimm/btt_devs.c
View File

@ -62,14 +62,14 @@ static ssize_t sector_size_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,
btt_lbasize_supported);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -91,11 +91,11 @@ static ssize_t uuid_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -120,13 +120,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -138,14 +138,14 @@ static ssize_t size_show(struct device *dev,
struct nd_btt *nd_btt = to_nd_btt(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
if (dev->driver)
rc = sprintf(buf, "%llu\n", nd_btt->size);
else {
/* no size to convey if the btt instance is disabled */
rc = -ENXIO;
}
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}

208
drivers/nvdimm/bus.c
View File

@ -26,7 +26,7 @@
int nvdimm_major;
static int nvdimm_bus_major;
static struct class *nd_class;
struct class *nd_class;
static DEFINE_IDA(nd_ida);
static int to_nd_device_type(struct device *dev)
@ -73,7 +73,7 @@ static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
{
nvdimm_bus_lock(&nvdimm_bus->dev);
if (--nvdimm_bus->probe_active == 0)
wake_up(&nvdimm_bus->probe_wait);
wake_up(&nvdimm_bus->wait);
nvdimm_bus_unlock(&nvdimm_bus->dev);
}
@ -91,7 +91,10 @@ static int nvdimm_bus_probe(struct device *dev)
dev->driver->name, dev_name(dev));
nvdimm_bus_probe_start(nvdimm_bus);
debug_nvdimm_lock(dev);
rc = nd_drv->probe(dev);
debug_nvdimm_unlock(dev);
if (rc == 0)
nd_region_probe_success(nvdimm_bus, dev);
else
@ -113,8 +116,11 @@ static int nvdimm_bus_remove(struct device *dev)
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
int rc = 0;
if (nd_drv->remove)
if (nd_drv->remove) {
debug_nvdimm_lock(dev);
rc = nd_drv->remove(dev);
debug_nvdimm_unlock(dev);
}
nd_region_disable(nvdimm_bus, dev);
dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
@ -140,7 +146,7 @@ static void nvdimm_bus_shutdown(struct device *dev)
void nd_device_notify(struct device *dev, enum nvdimm_event event)
{
device_lock(dev);
nd_device_lock(dev);
if (dev->driver) {
struct nd_device_driver *nd_drv;
@ -148,7 +154,7 @@ void nd_device_notify(struct device *dev, enum nvdimm_event event)
if (nd_drv->notify)
nd_drv->notify(dev, event);
}
device_unlock(dev);
nd_device_unlock(dev);
}
EXPORT_SYMBOL(nd_device_notify);
@ -296,7 +302,7 @@ static void nvdimm_bus_release(struct device *dev)
kfree(nvdimm_bus);
}
static bool is_nvdimm_bus(struct device *dev)
bool is_nvdimm_bus(struct device *dev)
{
return dev->release == nvdimm_bus_release;
}
@ -341,7 +347,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
init_waitqueue_head(&nvdimm_bus->probe_wait);
init_waitqueue_head(&nvdimm_bus->wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
@ -426,6 +432,9 @@ static int nd_bus_remove(struct device *dev)
list_del_init(&nvdimm_bus->list);
mutex_unlock(&nvdimm_bus_list_mutex);
wait_event(nvdimm_bus->wait,
atomic_read(&nvdimm_bus->ioctl_active) == 0);
nd_synchronize();
device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
@ -547,13 +556,38 @@ EXPORT_SYMBOL(nd_device_register);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
{
bool killed;
switch (mode) {
case ND_ASYNC:
/*
* In the async case this is being triggered with the
* device lock held and the unregistration work needs to
* be moved out of line iff this is thread has won the
* race to schedule the deletion.
*/
if (!kill_device(dev))
return;
get_device(dev);
async_schedule_domain(nd_async_device_unregister, dev,
&nd_async_domain);
break;
case ND_SYNC:
/*
* In the sync case the device is being unregistered due
* to a state change of the parent. Claim the kill state
* to synchronize against other unregistration requests,
* or otherwise let the async path handle it if the
* unregistration was already queued.
*/
nd_device_lock(dev);
killed = kill_device(dev);
nd_device_unlock(dev);
if (!killed)
return;
nd_synchronize();
device_unregister(dev);
break;
@ -859,10 +893,12 @@ void wait_nvdimm_bus_probe_idle(struct device *dev)
do {
if (nvdimm_bus->probe_active == 0)
break;
nvdimm_bus_unlock(&nvdimm_bus->dev);
wait_event(nvdimm_bus->probe_wait,
nvdimm_bus_unlock(dev);
nd_device_unlock(dev);
wait_event(nvdimm_bus->wait,
nvdimm_bus->probe_active == 0);
nvdimm_bus_lock(&nvdimm_bus->dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
} while (true);
}
@ -945,20 +981,19 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
int read_only, unsigned int ioctl_cmd, unsigned long arg)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
static char out_env[ND_CMD_MAX_ENVELOPE];
static char in_env[ND_CMD_MAX_ENVELOPE];
const struct nd_cmd_desc *desc = NULL;
unsigned int cmd = _IOC_NR(ioctl_cmd);
struct device *dev = &nvdimm_bus->dev;
void __user *p = (void __user *) arg;
char *out_env = NULL, *in_env = NULL;
const char *cmd_name, *dimm_name;
u32 in_len = 0, out_len = 0;
unsigned int func = cmd;
unsigned long cmd_mask;
struct nd_cmd_pkg pkg;
int rc, i, cmd_rc;
void *buf = NULL;
u64 buf_len = 0;
void *buf;
if (nvdimm) {
desc = nd_cmd_dimm_desc(cmd);
@ -989,7 +1024,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
case ND_CMD_ARS_START:
case ND_CMD_CLEAR_ERROR:
case ND_CMD_CALL:
dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
dev_dbg(dev, "'%s' command while read-only.\n",
nvdimm ? nvdimm_cmd_name(cmd)
: nvdimm_bus_cmd_name(cmd));
return -EPERM;
@ -998,6 +1033,9 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
}
/* process an input envelope */
in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
if (!in_env)
return -ENOMEM;
for (i = 0; i < desc->in_num; i++) {
u32 in_size, copy;
@ -1005,14 +1043,17 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
if (in_size == UINT_MAX) {
dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
__func__, dimm_name, cmd_name, i);
return -ENXIO;
rc = -ENXIO;
goto out;
}
if (in_len < sizeof(in_env))
copy = min_t(u32, sizeof(in_env) - in_len, in_size);
if (in_len < ND_CMD_MAX_ENVELOPE)
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
else
copy = 0;
if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
return -EFAULT;
if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
rc = -EFAULT;
goto out;
}
in_len += in_size;
}
@ -1024,6 +1065,12 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
}
/* process an output envelope */
out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
if (!out_env) {
rc = -ENOMEM;
goto out;
}
for (i = 0; i < desc->out_num; i++) {
u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
(u32 *) in_env, (u32 *) out_env, 0);
@ -1032,15 +1079,18 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
if (out_size == UINT_MAX) {
dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
dimm_name, cmd_name, i);
return -EFAULT;
rc = -EFAULT;
goto out;
}
if (out_len < sizeof(out_env))
copy = min_t(u32, sizeof(out_env) - out_len, out_size);
if (out_len < ND_CMD_MAX_ENVELOPE)
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
else
copy = 0;
if (copy && copy_from_user(&out_env[out_len],
p + in_len + out_len, copy))
return -EFAULT;
p + in_len + out_len, copy)) {
rc = -EFAULT;
goto out;
}
out_len += out_size;
}
@ -1048,19 +1098,23 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
if (buf_len > ND_IOCTL_MAX_BUFLEN) {
dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
return -EINVAL;
rc = -EINVAL;
goto out;
}
buf = vmalloc(buf_len);
if (!buf)
return -ENOMEM;
if (!buf) {
rc = -ENOMEM;
goto out;
}
if (copy_from_user(buf, p, buf_len)) {
rc = -EFAULT;
goto out;
}
nvdimm_bus_lock(&nvdimm_bus->dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
if (rc)
goto out_unlock;
@ -1075,39 +1129,24 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
clear_err->cleared);
}
nvdimm_bus_unlock(&nvdimm_bus->dev);
if (copy_to_user(p, buf, buf_len))
rc = -EFAULT;
vfree(buf);
return rc;
out_unlock:
nvdimm_bus_unlock(&nvdimm_bus->dev);
out:
out_unlock:
nvdimm_bus_unlock(dev);
nd_device_unlock(dev);
out:
kfree(in_env);
kfree(out_env);
vfree(buf);
return rc;
}
static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long id = (long) file->private_data;
int rc = -ENXIO, ro;
struct nvdimm_bus *nvdimm_bus;
ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
mutex_lock(&nvdimm_bus_list_mutex);
list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
if (nvdimm_bus->id == id) {
rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg);
break;
}
}
mutex_unlock(&nvdimm_bus_list_mutex);
return rc;
}
enum nd_ioctl_mode {
BUS_IOCTL,
DIMM_IOCTL,
};
static int match_dimm(struct device *dev, void *data)
{
@ -1122,31 +1161,62 @@ static int match_dimm(struct device *dev, void *data)
return 0;
}
static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
enum nd_ioctl_mode mode)
{
int rc = -ENXIO, ro;
struct nvdimm_bus *nvdimm_bus;
struct nvdimm_bus *nvdimm_bus, *found = NULL;
long id = (long) file->private_data;
struct nvdimm *nvdimm = NULL;
int rc, ro;
ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
mutex_lock(&nvdimm_bus_list_mutex);
list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
struct device *dev = device_find_child(&nvdimm_bus->dev,
file->private_data, match_dimm);
struct nvdimm *nvdimm;
if (mode == DIMM_IOCTL) {
struct device *dev;
if (!dev)
continue;
dev = device_find_child(&nvdimm_bus->dev,
file->private_data, match_dimm);
if (!dev)
continue;
nvdimm = to_nvdimm(dev);
found = nvdimm_bus;
} else if (nvdimm_bus->id == id) {
found = nvdimm_bus;
}
nvdimm = to_nvdimm(dev);
rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
put_device(dev);
break;
if (found) {
atomic_inc(&nvdimm_bus->ioctl_active);
break;
}
}
mutex_unlock(&nvdimm_bus_list_mutex);
if (!found)
return -ENXIO;
nvdimm_bus = found;
rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
if (nvdimm)
put_device(&nvdimm->dev);
if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
wake_up(&nvdimm_bus->wait);
return rc;
}
static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return nd_ioctl(file, cmd, arg, BUS_IOCTL);
}
static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
}
static int nd_open(struct inode *inode, struct file *file)
{
long minor = iminor(inode);
@ -1158,16 +1228,16 @@ static int nd_open(struct inode *inode, struct file *file)
static const struct file_operations nvdimm_bus_fops = {
.owner = THIS_MODULE,
.open = nd_open,
.unlocked_ioctl = nd_ioctl,
.compat_ioctl = nd_ioctl,
.unlocked_ioctl = bus_ioctl,
.compat_ioctl = bus_ioctl,
.llseek = noop_llseek,
};
static const struct file_operations nvdimm_fops = {
.owner = THIS_MODULE,
.open = nd_open,
.unlocked_ioctl = nvdimm_ioctl,
.compat_ioctl = nvdimm_ioctl,
.unlocked_ioctl = dimm_ioctl,
.compat_ioctl = dimm_ioctl,
.llseek = noop_llseek,
};

10
drivers/nvdimm/core.c
View File

@ -246,7 +246,7 @@ static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
*
* Enforce that uuids can only be changed while the device is disabled
* (driver detached)
* LOCKING: expects device_lock() is held on entry
* LOCKING: expects nd_device_lock() is held on entry
*/
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len)
@ -347,15 +347,15 @@ static DEVICE_ATTR_RO(provider);
static int flush_namespaces(struct device *dev, void *data)
{
device_lock(dev);
device_unlock(dev);
nd_device_lock(dev);
nd_device_unlock(dev);
return 0;
}
static int flush_regions_dimms(struct device *dev, void *data)
{
device_lock(dev);
device_unlock(dev);
nd_device_lock(dev);
nd_device_unlock(dev);
device_for_each_child(dev, NULL, flush_namespaces);
return 0;
}

4
drivers/nvdimm/dimm_devs.c
View File

@ -484,12 +484,12 @@ static ssize_t security_store(struct device *dev,
* done while probing is idle and the DIMM is not in active use
* in any region.
*/
device_lock(dev);
nd_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);
nd_device_unlock(dev);
return rc;
}

36
drivers/nvdimm/namespace_devs.c
View File

@ -410,7 +410,7 @@ static ssize_t alt_name_store(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
@ -418,7 +418,7 @@ static ssize_t alt_name_store(struct device *dev,
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc < 0 ? rc : len;
}
@ -1077,7 +1077,7 @@ static ssize_t size_store(struct device *dev,
if (rc)
return rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __size_store(dev, val);
@ -1103,7 +1103,7 @@ static ssize_t size_store(struct device *dev,
dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc < 0 ? rc : len;
}
@ -1286,7 +1286,7 @@ static ssize_t uuid_store(struct device *dev,
} else
return -ENXIO;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (to_ndns(dev)->claim)
@ -1302,7 +1302,7 @@ static ssize_t uuid_store(struct device *dev,
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc < 0 ? rc : len;
}
@ -1376,7 +1376,7 @@ static ssize_t sector_size_store(struct device *dev,
} else
return -ENXIO;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
if (to_ndns(dev)->claim)
rc = -EBUSY;
@ -1387,7 +1387,7 @@ static ssize_t sector_size_store(struct device *dev,
dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -1502,9 +1502,9 @@ static ssize_t holder_show(struct device *dev,
struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -1541,7 +1541,7 @@ static ssize_t holder_class_store(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __holder_class_store(dev, buf);
@ -1549,7 +1549,7 @@ static ssize_t holder_class_store(struct device *dev,
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc < 0 ? rc : len;
}
@ -1560,7 +1560,7 @@ static ssize_t holder_class_show(struct device *dev,
struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
if (ndns->claim_class == NVDIMM_CCLASS_NONE)
rc = sprintf(buf, "\n");
else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
@ -1572,7 +1572,7 @@ static ssize_t holder_class_show(struct device *dev,
rc = sprintf(buf, "dax\n");
else
rc = sprintf(buf, "<unknown>\n");
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -1586,7 +1586,7 @@ static ssize_t mode_show(struct device *dev,
char *mode;
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
claim = ndns->claim;
if (claim && is_nd_btt(claim))
mode = "safe";
@ -1599,7 +1599,7 @@ static ssize_t mode_show(struct device *dev,
else
mode = "raw";
rc = sprintf(buf, "%s\n", mode);
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -1703,8 +1703,8 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
* Flush any in-progess probes / removals in the driver
* for the raw personality of this namespace.
*/
device_lock(&ndns->dev);
device_unlock(&ndns->dev);
nd_device_lock(&ndns->dev);
nd_device_unlock(&ndns->dev);
if (ndns->dev.driver) {
dev_dbg(&ndns->dev, "is active, can't bind %s\n",
dev_name(dev));

71
drivers/nvdimm/nd-core.h
View File

@ -9,6 +9,7 @@
#include <linux/sizes.h>
#include <linux/mutex.h>
#include <linux/nd.h>
#include "nd.h"
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
@ -17,10 +18,11 @@ extern struct workqueue_struct *nvdimm_wq;
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
wait_queue_head_t probe_wait;
wait_queue_head_t wait;
struct list_head list;
struct device dev;
int id, probe_active;
atomic_t ioctl_active;
struct list_head mapping_list;
struct mutex reconfig_mutex;
struct badrange badrange;
@ -181,4 +183,71 @@ ssize_t nd_namespace_store(struct device *dev,
struct nd_namespace_common **_ndns, const char *buf,
size_t len);
struct nd_pfn *to_nd_pfn_safe(struct device *dev);
bool is_nvdimm_bus(struct device *dev);
#ifdef CONFIG_PROVE_LOCKING
extern struct class *nd_class;
enum {
LOCK_BUS,
LOCK_NDCTL,
LOCK_REGION,
LOCK_DIMM = LOCK_REGION,
LOCK_NAMESPACE,
LOCK_CLAIM,
};
static inline void debug_nvdimm_lock(struct device *dev)
{
if (is_nd_region(dev))
mutex_lock_nested(&dev->lockdep_mutex, LOCK_REGION);
else if (is_nvdimm(dev))
mutex_lock_nested(&dev->lockdep_mutex, LOCK_DIMM);
else if (is_nd_btt(dev) || is_nd_pfn(dev) || is_nd_dax(dev))
mutex_lock_nested(&dev->lockdep_mutex, LOCK_CLAIM);
else if (dev->parent && (is_nd_region(dev->parent)))
mutex_lock_nested(&dev->lockdep_mutex, LOCK_NAMESPACE);
else if (is_nvdimm_bus(dev))
mutex_lock_nested(&dev->lockdep_mutex, LOCK_BUS);
else if (dev->class && dev->class == nd_class)
mutex_lock_nested(&dev->lockdep_mutex, LOCK_NDCTL);
else
dev_WARN(dev, "unknown lock level\n");
}
static inline void debug_nvdimm_unlock(struct device *dev)
{
mutex_unlock(&dev->lockdep_mutex);
}
static inline void nd_device_lock(struct device *dev)
{
device_lock(dev);
debug_nvdimm_lock(dev);
}
static inline void nd_device_unlock(struct device *dev)
{
debug_nvdimm_unlock(dev);
device_unlock(dev);
}
#else
static inline void nd_device_lock(struct device *dev)
{
device_lock(dev);
}
static inline void nd_device_unlock(struct device *dev)
{
device_unlock(dev);
}
static inline void debug_nvdimm_lock(struct device *dev)
{
}
static inline void debug_nvdimm_unlock(struct device *dev)
{
}
#endif
#endif /* __ND_CORE_H__ */

24
drivers/nvdimm/pfn_devs.c
View File

@ -67,7 +67,7 @@ static ssize_t mode_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc = 0;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
if (dev->driver)
rc = -EBUSY;
@ -89,7 +89,7 @@ static ssize_t mode_store(struct device *dev,
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -132,14 +132,14 @@ static ssize_t align_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_size_select_store(dev, buf, &nd_pfn->align,
nd_pfn_supported_alignments());
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -161,11 +161,11 @@ static ssize_t uuid_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
device_unlock(dev);
nd_device_unlock(dev);
return rc ? rc : len;
}
@ -190,13 +190,13 @@ static ssize_t namespace_store(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -208,7 +208,7 @@ static ssize_t resource_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff);
@ -222,7 +222,7 @@ static ssize_t resource_show(struct device *dev,
/* no address to convey if the pfn instance is disabled */
rc = -ENXIO;
}
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}
@ -234,7 +234,7 @@ static ssize_t size_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff);
@ -250,7 +250,7 @@ static ssize_t size_show(struct device *dev,
/* no size to convey if the pfn instance is disabled */
rc = -ENXIO;
}
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}

4
drivers/nvdimm/pmem.c
View File

@ -522,8 +522,8 @@ static int nd_pmem_remove(struct device *dev)
nvdimm_namespace_detach_btt(to_nd_btt(dev));
else {
/*
* Note, this assumes device_lock() context to not race
* nd_pmem_notify()
* Note, this assumes nd_device_lock() context to not
* race nd_pmem_notify()
*/
sysfs_put(pmem->bb_state);
pmem->bb_state = NULL;

24
drivers/nvdimm/region.c
View File

@ -34,17 +34,6 @@ static int nd_region_probe(struct device *dev)
if (rc)
return rc;
rc = nd_region_register_namespaces(nd_region, &err);
if (rc < 0)
return rc;
ndrd = dev_get_drvdata(dev);
ndrd->ns_active = rc;
ndrd->ns_count = rc + err;
if (rc && err && rc == err)
return -ENODEV;
if (is_nd_pmem(&nd_region->dev)) {
struct resource ndr_res;
@ -60,6 +49,17 @@ static int nd_region_probe(struct device *dev)
nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res);
}
rc = nd_region_register_namespaces(nd_region, &err);
if (rc < 0)
return rc;
ndrd = dev_get_drvdata(dev);
ndrd->ns_active = rc;
ndrd->ns_count = rc + err;
if (rc && err && rc == err)
return -ENODEV;
nd_region->btt_seed = nd_btt_create(nd_region);
nd_region->pfn_seed = nd_pfn_create(nd_region);
nd_region->dax_seed = nd_dax_create(nd_region);
@ -102,7 +102,7 @@ static int nd_region_remove(struct device *dev)
nvdimm_bus_unlock(dev);
/*
* Note, this assumes device_lock() context to not race
* Note, this assumes nd_device_lock() context to not race
* nd_region_notify()
*/
sysfs_put(nd_region->bb_state);

12
drivers/nvdimm/region_devs.c
View File

@ -331,7 +331,7 @@ static ssize_t set_cookie_show(struct device *dev,
* the v1.1 namespace label cookie definition. To read all this
* data we need to wait for probing to settle.
*/
device_lock(dev);
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (nd_region->ndr_mappings) {
@ -348,7 +348,7 @@ static ssize_t set_cookie_show(struct device *dev,
}
}
nvdimm_bus_unlock(dev);
device_unlock(dev);
nd_device_unlock(dev);
if (rc)
return rc;
@ -424,10 +424,12 @@ static ssize_t available_size_show(struct device *dev,
* memory nvdimm_bus_lock() is dropped, but that's userspace's
* problem to not race itself.
*/
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_available_dpa(nd_region);
nvdimm_bus_unlock(dev);
nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@ -439,10 +441,12 @@ static ssize_t max_available_extent_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
unsigned long long available = 0;
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
available = nd_region_allocatable_dpa(nd_region);
nvdimm_bus_unlock(dev);
nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available);
}
@ -561,12 +565,12 @@ static ssize_t region_badblocks_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev);
ssize_t rc;
device_lock(dev);
nd_device_lock(dev);
if (dev->driver)
rc = badblocks_show(&nd_region->bb, buf, 0);
else
rc = -ENXIO;
device_unlock(dev);
nd_device_unlock(dev);
return rc;
}

6
include/linux/device.h
View File

@ -915,6 +915,8 @@ struct dev_links_info {
* This identifies the device type and carries type-specific
* information.
* @mutex: Mutex to synchronize calls to its driver.
* @lockdep_mutex: An optional debug lock that a subsystem can use as a
* peer lock to gain localized lockdep coverage of the device_lock.
* @bus: Type of bus device is on.
* @driver: Which driver has allocated this
* @platform_data: Platform data specific to the device.
@ -998,6 +1000,9 @@ struct device {
core doesn't touch it */
void *driver_data; /* Driver data, set and get with
dev_set_drvdata/dev_get_drvdata */
#ifdef CONFIG_PROVE_LOCKING
struct mutex lockdep_mutex;
#endif
struct mutex mutex; /* mutex to synchronize calls to
* its driver.
*/
@ -1383,6 +1388,7 @@ extern int (*platform_notify_remove)(struct device *dev);
*/
extern struct device *get_device(struct device *dev);
extern void put_device(struct device *dev);
extern bool kill_device(struct device *dev);
#ifdef CONFIG_DEVTMPFS
extern int devtmpfs_create_node(struct device *dev);