/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#ifndef __LINUX_ND_H__
#define __LINUX_ND_H__
#include <linux/fs.h>
#include <linux/ndctl.h>
#include <linux/device.h>
#include <linux/badblocks.h>
#include <linux/perf_event.h>
enum nvdimm_event {
NVDIMM_REVALIDATE_POISON,
NVDIMM_REVALIDATE_REGION,
};
enum nvdimm_claim_class {
NVDIMM_CCLASS_NONE,
NVDIMM_CCLASS_BTT,
NVDIMM_CCLASS_BTT2,
NVDIMM_CCLASS_PFN,
NVDIMM_CCLASS_DAX,
NVDIMM_CCLASS_UNKNOWN,
};
#define NVDIMM_EVENT_VAR(_id) event_attr_##_id
#define NVDIMM_EVENT_PTR(_id) (&event_attr_##_id.attr.attr)
#define NVDIMM_EVENT_ATTR(_name, _id) \
PMU_EVENT_ATTR(_name, NVDIMM_EVENT_VAR(_id), _id, \
nvdimm_events_sysfs_show)
/* Event attribute array index */
#define NVDIMM_PMU_FORMAT_ATTR 0
#define NVDIMM_PMU_EVENT_ATTR 1
#define NVDIMM_PMU_CPUMASK_ATTR 2
#define NVDIMM_PMU_NULL_ATTR 3
/**
* struct nvdimm_pmu - data structure for nvdimm perf driver
* @pmu: pmu data structure for nvdimm performance stats.
* @dev: nvdimm device pointer.
* @cpu: designated cpu for counter access.
* @node: node for cpu hotplug notifier link.
* @cpuhp_state: state for cpu hotplug notification.
* @arch_cpumask: cpumask to get designated cpu for counter access.
*/
struct nvdimm_pmu {
struct pmu pmu;
struct device *dev;
int cpu;
struct hlist_node node;
enum cpuhp_state cpuhp_state;
/* cpumask provided by arch/platform specific code */
struct cpumask arch_cpumask;
};
struct platform_device;
#ifdef CONFIG_PERF_EVENTS
extern ssize_t nvdimm_events_sysfs_show(struct device *dev,
struct device_attribute *attr,
char *page);
int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm, struct platform_device *pdev);
void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu);
#else
static inline int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm, struct platform_device *pdev)
{
return -ENXIO;
}
static inline void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu) { }
#endif
struct nd_device_driver {
struct device_driver drv;
unsigned long type;
int (*probe)(struct device *dev);
void (*remove)(struct device *dev);
void (*shutdown)(struct device *dev);
void (*notify)(struct device *dev, enum nvdimm_event event);
};
static inline struct nd_device_driver *to_nd_device_driver(
struct device_driver *drv)
{
return container_of(drv, struct nd_device_driver, drv);
};
/**
* struct nd_namespace_common - core infrastructure of a namespace
* @force_raw: ignore other personalities for the namespace (e.g. btt)
* @dev: device model node
* @claim: when set a another personality has taken ownership of the namespace
* @claim_class: restrict claim type to a given class
* @rw_bytes: access the raw namespace capacity with byte-aligned transfers
*/
struct nd_namespace_common {
int force_raw;
struct device dev;
struct device *claim;
enum nvdimm_claim_class claim_class;
int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
void *buf, size_t size, int rw, unsigned long flags);
};
static inline struct nd_namespace_common *to_ndns(struct device *dev)
{
return container_of(dev, struct nd_namespace_common, dev);
}
/**
* struct nd_namespace_io - device representation of a persistent memory range
* @dev: namespace device created by the nd region driver
* @res: struct resource conversion of a NFIT SPA table
* @size: cached resource_size(@res) for fast path size checks
* @addr: virtual address to access the namespace range
* @bb: badblocks list for the namespace range
*/
struct nd_namespace_io {
struct nd_namespace_common common;
struct resource res;
resource_size_t size;
void *addr;
struct badblocks bb;
};
/**
* struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
* @nsio: device and system physical address range to drive
* @lbasize: logical sector size for the namespace in block-device-mode
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
*/
struct nd_namespace_pmem {
struct nd_namespace_io nsio;
unsigned long lbasize;
char *alt_name;
uuid_t *uuid;
int id;
};
static inline struct nd_namespace_io *to_nd_namespace_io(const struct device *dev)
{
return container_of(dev, struct nd_namespace_io, common.dev);
}
static inline struct nd_namespace_pmem *to_nd_namespace_pmem(const struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
return container_of(nsio, struct nd_namespace_pmem, nsio);
}
/**
* nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
* @ndns: device to read
* @offset: namespace-relative starting offset
* @buf: buffer to fill
* @size: transfer length
*
* @buf is up-to-date upon return from this routine.
*/
static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size,
unsigned long flags)
{
return ndns->rw_bytes(ndns, offset, buf, size, READ, flags);
}
/**
* nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
* @ndns: device to write
* @offset: namespace-relative starting offset
* @buf: buffer to drain
* @size: transfer length
*
* NVDIMM Namepaces disks do not implement sectors internally. Depending on
* the @ndns, the contents of @buf may be in cpu cache, platform buffers,
* or on backing memory media upon return from this routine. Flushing
* to media is handled internal to the @ndns driver, if at all.
*/
static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size,
unsigned long flags)
{
return ndns->rw_bytes(ndns, offset, buf, size, WRITE, flags);
}
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
struct nd_region;
void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event);
int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
struct module *module, const char *mod_name);
static inline void nd_driver_unregister(struct nd_device_driver *drv)
{
driver_unregister(&drv->drv);
}
#define nd_driver_register(driver) \
__nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
#define module_nd_driver(driver) \
module_driver(driver, nd_driver_register, nd_driver_unregister)
#endif /* __LINUX_ND_H__ */
