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linux_dsm_epyc7002/drivers/nvdimm/nd-core.h
Dan Williams 87a30e1f05 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
2019-07-18 16:23:27 -07:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#ifndef __ND_CORE_H__
#define __ND_CORE_H__
#include <linux/libnvdimm.h>
#include <linux/device.h>
#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;
extern int nvdimm_major;
extern struct workqueue_struct *nvdimm_wq;
struct nvdimm_bus {
struct nvdimm_bus_descriptor *nd_desc;
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;
};
struct nvdimm {
unsigned long flags;
void *provider_data;
unsigned long cmd_mask;
struct device dev;
atomic_t busy;
int id, num_flush;
struct resource *flush_wpq;
const char *dimm_id;
struct {
const struct nvdimm_security_ops *ops;
enum nvdimm_security_state state;
enum nvdimm_security_state ext_state;
unsigned int overwrite_tmo;
struct kernfs_node *overwrite_state;
} sec;
struct delayed_work dwork;
};
static inline enum nvdimm_security_state nvdimm_security_state(
struct nvdimm *nvdimm, enum nvdimm_passphrase_type ptype)
{
if (!nvdimm->sec.ops)
return -ENXIO;
return nvdimm->sec.ops->state(nvdimm, ptype);
}
int nvdimm_security_freeze(struct nvdimm *nvdimm);
#if IS_ENABLED(CONFIG_NVDIMM_KEYS)
int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid);
int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
unsigned int new_keyid,
enum nvdimm_passphrase_type pass_type);
int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
enum nvdimm_passphrase_type pass_type);
int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid);
void nvdimm_security_overwrite_query(struct work_struct *work);
#else
static inline int nvdimm_security_disable(struct nvdimm *nvdimm,
unsigned int keyid)
{
return -EOPNOTSUPP;
}
static inline int nvdimm_security_update(struct nvdimm *nvdimm,
unsigned int keyid,
unsigned int new_keyid,
enum nvdimm_passphrase_type pass_type)
{
return -EOPNOTSUPP;
}
static inline int nvdimm_security_erase(struct nvdimm *nvdimm,
unsigned int keyid,
enum nvdimm_passphrase_type pass_type)
{
return -EOPNOTSUPP;
}
static inline int nvdimm_security_overwrite(struct nvdimm *nvdimm,
unsigned int keyid)
{
return -EOPNOTSUPP;
}
static inline void nvdimm_security_overwrite_query(struct work_struct *work)
{
}
#endif
/**
* struct blk_alloc_info - tracking info for BLK dpa scanning
* @nd_mapping: blk region mapping boundaries
* @available: decremented in alias_dpa_busy as aliased PMEM is scanned
* @busy: decremented in blk_dpa_busy to account for ranges already
* handled by alias_dpa_busy
* @res: alias_dpa_busy interprets this a free space range that needs to
* be truncated to the valid BLK allocation starting DPA, blk_dpa_busy
* treats it as a busy range that needs the aliased PMEM ranges
* truncated.
*/
struct blk_alloc_info {
struct nd_mapping *nd_mapping;
resource_size_t available, busy;
struct resource *res;
};
bool is_nvdimm(struct device *dev);
bool is_nd_pmem(struct device *dev);
bool is_nd_volatile(struct device *dev);
bool is_nd_blk(struct device *dev);
static inline bool is_nd_region(struct device *dev)
{
return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev);
}
static inline bool is_memory(struct device *dev)
{
return is_nd_pmem(dev) || is_nd_volatile(dev);
}
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
void nvdimm_devs_exit(void);
void nd_region_devs_exit(void);
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);
struct nd_region;
void nd_region_create_ns_seed(struct nd_region *nd_region);
void nd_region_create_btt_seed(struct nd_region *nd_region);
void nd_region_create_pfn_seed(struct nd_region *nd_region);
void nd_region_create_dax_seed(struct nd_region *nd_region);
void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
void nd_synchronize(void);
int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
void __nd_device_register(struct device *dev);
int nd_match_dimm(struct device *dev, void *data);
struct nd_label_id;
char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
bool nd_is_uuid_unique(struct device *dev, u8 *uuid);
struct nd_region;
struct nvdimm_drvdata;
struct nd_mapping;
void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
int __reserve_free_pmem(struct device *dev, void *data);
void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
struct nd_mapping *nd_mapping);
resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping);
resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, resource_size_t *overlap);
resource_size_t nd_blk_available_dpa(struct nd_region *nd_region);
resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
resource_size_t size);
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id);
int alias_dpa_busy(struct device *dev, void *data);
struct resource *nsblk_add_resource(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
resource_size_t start);
int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
void get_ndd(struct nvdimm_drvdata *ndd);
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
void nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
struct nd_namespace_common **_ndns);
bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
struct nd_namespace_common **_ndns);
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__ */
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