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driver-core, libnvdimm: Let device subsystems add local lockdep coverage 

For good reason, the standard device_lock() is marked
lockdep_set_novalidate_class() because there is simply no sane way to
describe the myriad ways the device_lock() ordered with other locks.
However, that leaves subsystems that know their own local device_lock()
ordering rules to find lock ordering mistakes manually. Instead,
introduce an optional / additional lockdep-enabled lock that a subsystem
can acquire in all the same paths that the device_lock() is acquired.

A conversion of the NFIT driver and NVDIMM subsystem to a
lockdep-validate device_lock() scheme is included. The
debug_nvdimm_lock() implementation implements the correct lock-class and
stacking order for the libnvdimm device topology hierarchy.

Yes, this is a hack, but hopefully it is a useful hack for other
subsystems device_lock() debug sessions. Quoting Greg:

    "Yeah, it feels a bit hacky but it's really up to a subsystem to mess up
     using it as much as anything else, so user beware :)

     I don't object to it if it makes things easier for you to debug."

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/156341210661.292348.7014034644265455704.stgit@dwillia2-desk3.amr.corp.intel.com
This commit is contained in:
Dan Williams 2019-07-17 18:08:26 -07:00
parent ca6bf264f6
commit 87a30e1f05
14 changed files with 187 additions and 81 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) if (rc)
return rc; return rc;
device_lock(dev); nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev); nd_desc = dev_get_drvdata(dev);
if (nd_desc) { if (nd_desc) {
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(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; break;
} }
} }
device_unlock(dev); nfit_device_unlock(dev);
if (rc) if (rc)
return rc; return rc;
return size; return size;
@ -1319,7 +1319,7 @@ static ssize_t scrub_show(struct device *dev,
ssize_t rc = -ENXIO; ssize_t rc = -ENXIO;
bool busy; bool busy;
device_lock(dev); nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev); nd_desc = dev_get_drvdata(dev);
if (!nd_desc) { if (!nd_desc) {
device_unlock(dev); device_unlock(dev);
@ -1339,7 +1339,7 @@ static ssize_t scrub_show(struct device *dev,
} }
mutex_unlock(&acpi_desc->init_mutex); mutex_unlock(&acpi_desc->init_mutex);
device_unlock(dev); nfit_device_unlock(dev);
return rc; return rc;
} }
@ -1356,14 +1356,14 @@ static ssize_t scrub_store(struct device *dev,
if (val != 1) if (val != 1)
return -EINVAL; return -EINVAL;
device_lock(dev); nfit_device_lock(dev);
nd_desc = dev_get_drvdata(dev); nd_desc = dev_get_drvdata(dev);
if (nd_desc) { if (nd_desc) {
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
rc = acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG); rc = acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG);
} }
device_unlock(dev); nfit_device_unlock(dev);
if (rc) if (rc)
return rc; return rc;
return size; return size;
@ -1749,9 +1749,9 @@ static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data)
struct acpi_device *adev = data; struct acpi_device *adev = data;
struct device *dev = &adev->dev; struct device *dev = &adev->dev;
device_lock(dev->parent); nfit_device_lock(dev->parent);
__acpi_nvdimm_notify(dev, event); __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) 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; struct device *dev = acpi_desc->dev;
/* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */ /* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */
device_lock(dev); nfit_device_lock(dev);
device_unlock(dev); nfit_device_unlock(dev);
/* Bounce the init_mutex to complete initial registration */ /* Bounce the init_mutex to complete initial registration */
mutex_lock(&acpi_desc->init_mutex); 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 * acpi_nfit_ars_rescan() submissions have had a chance to
* either submit or see ->cancel set. * either submit or see ->cancel set.
*/ */
device_lock(bus_dev); nfit_device_lock(bus_dev);
device_unlock(bus_dev); nfit_device_unlock(bus_dev);
flush_workqueue(nfit_wq); 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) 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); __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[] = { 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); 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); 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); int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *nfit, acpi_size sz);
void acpi_nfit_shutdown(void *data); void acpi_nfit_shutdown(void *data);

3
drivers/base/core.c
View File

@ -1663,6 +1663,9 @@ void device_initialize(struct device *dev)
kobject_init(&dev->kobj, &device_ktype); kobject_init(&dev->kobj, &device_ktype);
INIT_LIST_HEAD(&dev->dma_pools); INIT_LIST_HEAD(&dev->dma_pools);
mutex_init(&dev->mutex); mutex_init(&dev->mutex);
#ifdef CONFIG_PROVE_LOCKING
mutex_init(&dev->lockdep_mutex);
#endif
lockdep_set_novalidate_class(&dev->mutex); lockdep_set_novalidate_class(&dev->mutex);
spin_lock_init(&dev->devres_lock); spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head); INIT_LIST_HEAD(&dev->devres_head);

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

28
drivers/nvdimm/bus.c
View File

@ -26,7 +26,7 @@
int nvdimm_major; int nvdimm_major;
static int nvdimm_bus_major; static int nvdimm_bus_major;
static struct class *nd_class; struct class *nd_class;
static DEFINE_IDA(nd_ida); static DEFINE_IDA(nd_ida);
static int to_nd_device_type(struct device *dev) static int to_nd_device_type(struct device *dev)
@ -91,7 +91,10 @@ static int nvdimm_bus_probe(struct device *dev)
dev->driver->name, dev_name(dev)); dev->driver->name, dev_name(dev));
nvdimm_bus_probe_start(nvdimm_bus); nvdimm_bus_probe_start(nvdimm_bus);
debug_nvdimm_lock(dev);
rc = nd_drv->probe(dev); rc = nd_drv->probe(dev);
debug_nvdimm_unlock(dev);
if (rc == 0) if (rc == 0)
nd_region_probe_success(nvdimm_bus, dev); nd_region_probe_success(nvdimm_bus, dev);
else else
@ -113,8 +116,11 @@ static int nvdimm_bus_remove(struct device *dev)
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
int rc = 0; int rc = 0;
if (nd_drv->remove) if (nd_drv->remove) {
debug_nvdimm_lock(dev);
rc = nd_drv->remove(dev); rc = nd_drv->remove(dev);
debug_nvdimm_unlock(dev);
}
nd_region_disable(nvdimm_bus, dev); nd_region_disable(nvdimm_bus, dev);
dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, 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) void nd_device_notify(struct device *dev, enum nvdimm_event event)
{ {
device_lock(dev); nd_device_lock(dev);
if (dev->driver) { if (dev->driver) {
struct nd_device_driver *nd_drv; 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) if (nd_drv->notify)
nd_drv->notify(dev, event); nd_drv->notify(dev, event);
} }
device_unlock(dev); nd_device_unlock(dev);
} }
EXPORT_SYMBOL(nd_device_notify); EXPORT_SYMBOL(nd_device_notify);
@ -296,7 +302,7 @@ static void nvdimm_bus_release(struct device *dev)
kfree(nvdimm_bus); kfree(nvdimm_bus);
} }
static bool is_nvdimm_bus(struct device *dev) bool is_nvdimm_bus(struct device *dev)
{ {
return dev->release == nvdimm_bus_release; return dev->release == nvdimm_bus_release;
} }
@ -575,9 +581,9 @@ void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
* or otherwise let the async path handle it if the * or otherwise let the async path handle it if the
* unregistration was already queued. * unregistration was already queued.
*/ */
device_lock(dev); nd_device_lock(dev);
killed = kill_device(dev); killed = kill_device(dev);
device_unlock(dev); nd_device_unlock(dev);
if (!killed) if (!killed)
return; return;
@ -888,10 +894,10 @@ void wait_nvdimm_bus_probe_idle(struct device *dev)
if (nvdimm_bus->probe_active == 0) if (nvdimm_bus->probe_active == 0)
break; break;
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
wait_event(nvdimm_bus->wait, wait_event(nvdimm_bus->wait,
nvdimm_bus->probe_active == 0); nvdimm_bus->probe_active == 0);
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
} while (true); } while (true);
} }
@ -1107,7 +1113,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
goto out; goto out;
} }
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf); rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
if (rc) if (rc)
@ -1129,7 +1135,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
out_unlock: out_unlock:
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
out: out:
kfree(in_env); kfree(in_env);
kfree(out_env); kfree(out_env);

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 * Enforce that uuids can only be changed while the device is disabled
* (driver detached) * (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, int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len) size_t len)
@ -347,15 +347,15 @@ static DEVICE_ATTR_RO(provider);
static int flush_namespaces(struct device *dev, void *data) static int flush_namespaces(struct device *dev, void *data)
{ {
device_lock(dev); nd_device_lock(dev);
device_unlock(dev); nd_device_unlock(dev);
return 0; return 0;
} }
static int flush_regions_dimms(struct device *dev, void *data) static int flush_regions_dimms(struct device *dev, void *data)
{ {
device_lock(dev); nd_device_lock(dev);
device_unlock(dev); nd_device_unlock(dev);
device_for_each_child(dev, NULL, flush_namespaces); device_for_each_child(dev, NULL, flush_namespaces);
return 0; 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 * done while probing is idle and the DIMM is not in active use
* in any region. * in any region.
*/ */
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
rc = __security_store(dev, buf, len); rc = __security_store(dev, buf, len);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc; 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); struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len); 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); rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc); dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc < 0 ? rc : len; return rc < 0 ? rc : len;
} }
@ -1077,7 +1077,7 @@ static ssize_t size_store(struct device *dev,
if (rc) if (rc)
return rc; return rc;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
rc = __size_store(dev, val); 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); dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc < 0 ? rc : len; return rc < 0 ? rc : len;
} }
@ -1286,7 +1286,7 @@ static ssize_t uuid_store(struct device *dev,
} else } else
return -ENXIO; return -ENXIO;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
if (to_ndns(dev)->claim) 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, dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n"); buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc < 0 ? rc : len; return rc < 0 ? rc : len;
} }
@ -1376,7 +1376,7 @@ static ssize_t sector_size_store(struct device *dev,
} else } else
return -ENXIO; return -ENXIO;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
if (to_ndns(dev)->claim) if (to_ndns(dev)->claim)
rc = -EBUSY; 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", dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
buf, buf[len - 1] == '\n' ? "" : "\n"); buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc ? rc : len; return rc ? rc : len;
} }
@ -1502,9 +1502,9 @@ static ssize_t holder_show(struct device *dev,
struct nd_namespace_common *ndns = to_ndns(dev); struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : ""); rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
device_unlock(dev); nd_device_unlock(dev);
return rc; 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); struct nd_region *nd_region = to_nd_region(dev->parent);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
rc = __holder_class_store(dev, buf); 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); rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc); dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc < 0 ? rc : len; 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); struct nd_namespace_common *ndns = to_ndns(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
if (ndns->claim_class == NVDIMM_CCLASS_NONE) if (ndns->claim_class == NVDIMM_CCLASS_NONE)
rc = sprintf(buf, "\n"); rc = sprintf(buf, "\n");
else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) || 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"); rc = sprintf(buf, "dax\n");
else else
rc = sprintf(buf, "<unknown>\n"); rc = sprintf(buf, "<unknown>\n");
device_unlock(dev); nd_device_unlock(dev);
return rc; return rc;
} }
@ -1586,7 +1586,7 @@ static ssize_t mode_show(struct device *dev,
char *mode; char *mode;
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
claim = ndns->claim; claim = ndns->claim;
if (claim && is_nd_btt(claim)) if (claim && is_nd_btt(claim))
mode = "safe"; mode = "safe";
@ -1599,7 +1599,7 @@ static ssize_t mode_show(struct device *dev,
else else
mode = "raw"; mode = "raw";
rc = sprintf(buf, "%s\n", mode); rc = sprintf(buf, "%s\n", mode);
device_unlock(dev); nd_device_unlock(dev);
return rc; 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 * Flush any in-progess probes / removals in the driver
* for the raw personality of this namespace. * for the raw personality of this namespace.
*/ */
device_lock(&ndns->dev); nd_device_lock(&ndns->dev);
device_unlock(&ndns->dev); nd_device_unlock(&ndns->dev);
if (ndns->dev.driver) { if (ndns->dev.driver) {
dev_dbg(&ndns->dev, "is active, can't bind %s\n", dev_dbg(&ndns->dev, "is active, can't bind %s\n",
dev_name(dev)); dev_name(dev));

68
drivers/nvdimm/nd-core.h
View File

@ -9,6 +9,7 @@
#include <linux/sizes.h> #include <linux/sizes.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/nd.h> #include <linux/nd.h>
#include "nd.h"
extern struct list_head nvdimm_bus_list; extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex; extern struct mutex nvdimm_bus_list_mutex;
@ -182,4 +183,71 @@ ssize_t nd_namespace_store(struct device *dev,
struct nd_namespace_common **_ndns, const char *buf, struct nd_namespace_common **_ndns, const char *buf,
size_t len); size_t len);
struct nd_pfn *to_nd_pfn_safe(struct device *dev); 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__ */ #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); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc = 0; ssize_t rc = 0;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
if (dev->driver) if (dev->driver)
rc = -EBUSY; rc = -EBUSY;
@ -89,7 +89,7 @@ static ssize_t mode_store(struct device *dev,
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n"); buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc ? rc : len; 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); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
rc = nd_size_select_store(dev, buf, &nd_pfn->align, rc = nd_size_select_store(dev, buf, &nd_pfn->align,
nd_pfn_supported_alignments()); nd_pfn_supported_alignments());
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n"); buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc ? rc : len; 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); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len); rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n"); buf[len - 1] == '\n' ? "" : "\n");
device_unlock(dev); nd_device_unlock(dev);
return rc ? rc : len; 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); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len); rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n"); buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return rc; return rc;
} }
@ -208,7 +208,7 @@ static ssize_t resource_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
if (dev->driver) { if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff); 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 */ /* no address to convey if the pfn instance is disabled */
rc = -ENXIO; rc = -ENXIO;
} }
device_unlock(dev); nd_device_unlock(dev);
return rc; return rc;
} }
@ -234,7 +234,7 @@ static ssize_t size_show(struct device *dev,
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
if (dev->driver) { if (dev->driver) {
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = __le64_to_cpu(pfn_sb->dataoff); 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 */ /* no size to convey if the pfn instance is disabled */
rc = -ENXIO; rc = -ENXIO;
} }
device_unlock(dev); nd_device_unlock(dev);
return rc; return rc;
} }

4
drivers/nvdimm/pmem.c
View File

@ -520,8 +520,8 @@ static int nd_pmem_remove(struct device *dev)
nvdimm_namespace_detach_btt(to_nd_btt(dev)); nvdimm_namespace_detach_btt(to_nd_btt(dev));
else { else {
/* /*
* Note, this assumes device_lock() context to not race * Note, this assumes nd_device_lock() context to not
* nd_pmem_notify() * race nd_pmem_notify()
*/ */
sysfs_put(pmem->bb_state); sysfs_put(pmem->bb_state);
pmem->bb_state = NULL; pmem->bb_state = NULL;

2
drivers/nvdimm/region.c
View File

@ -102,7 +102,7 @@ static int nd_region_remove(struct device *dev)
nvdimm_bus_unlock(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() * nd_region_notify()
*/ */
sysfs_put(nd_region->bb_state); sysfs_put(nd_region->bb_state);

16
drivers/nvdimm/region_devs.c
View File

@ -329,7 +329,7 @@ static ssize_t set_cookie_show(struct device *dev,
* the v1.1 namespace label cookie definition. To read all this * the v1.1 namespace label cookie definition. To read all this
* data we need to wait for probing to settle. * data we need to wait for probing to settle.
*/ */
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
if (nd_region->ndr_mappings) { if (nd_region->ndr_mappings) {
@ -346,7 +346,7 @@ static ssize_t set_cookie_show(struct device *dev,
} }
} }
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
if (rc) if (rc)
return rc; return rc;
@ -422,12 +422,12 @@ static ssize_t available_size_show(struct device *dev,
* memory nvdimm_bus_lock() is dropped, but that's userspace's * memory nvdimm_bus_lock() is dropped, but that's userspace's
* problem to not race itself. * problem to not race itself.
*/ */
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
available = nd_region_available_dpa(nd_region); available = nd_region_available_dpa(nd_region);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available); return sprintf(buf, "%llu\n", available);
} }
@ -439,12 +439,12 @@ static ssize_t max_available_extent_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev); struct nd_region *nd_region = to_nd_region(dev);
unsigned long long available = 0; unsigned long long available = 0;
device_lock(dev); nd_device_lock(dev);
nvdimm_bus_lock(dev); nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev); wait_nvdimm_bus_probe_idle(dev);
available = nd_region_allocatable_dpa(nd_region); available = nd_region_allocatable_dpa(nd_region);
nvdimm_bus_unlock(dev); nvdimm_bus_unlock(dev);
device_unlock(dev); nd_device_unlock(dev);
return sprintf(buf, "%llu\n", available); return sprintf(buf, "%llu\n", available);
} }
@ -563,12 +563,12 @@ static ssize_t region_badblocks_show(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev); struct nd_region *nd_region = to_nd_region(dev);
ssize_t rc; ssize_t rc;
device_lock(dev); nd_device_lock(dev);
if (dev->driver) if (dev->driver)
rc = badblocks_show(&nd_region->bb, buf, 0); rc = badblocks_show(&nd_region->bb, buf, 0);
else else
rc = -ENXIO; rc = -ENXIO;
device_unlock(dev); nd_device_unlock(dev);
return rc; return rc;
} }

5
include/linux/device.h
View File

@ -909,6 +909,8 @@ struct dev_links_info {
* This identifies the device type and carries type-specific * This identifies the device type and carries type-specific
* information. * information.
* @mutex: Mutex to synchronize calls to its driver. * @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. * @bus: Type of bus device is on.
* @driver: Which driver has allocated this * @driver: Which driver has allocated this
* @platform_data: Platform data specific to the device. * @platform_data: Platform data specific to the device.
@ -991,6 +993,9 @@ struct device {
core doesn't touch it */ core doesn't touch it */
void *driver_data; /* Driver data, set and get with void *driver_data; /* Driver data, set and get with
dev_set_drvdata/dev_get_drvdata */ dev_set_drvdata/dev_get_drvdata */
#ifdef CONFIG_PROVE_LOCKING
struct mutex lockdep_mutex;
#endif
struct mutex mutex; /* mutex to synchronize calls to struct mutex mutex; /* mutex to synchronize calls to
* its driver. * its driver.
*/ */