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nd.h
/* 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__ */
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