diff options
Diffstat (limited to 'drivers/nvdimm/nd.h')
| -rw-r--r-- | drivers/nvdimm/nd.h | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h new file mode 100644 index 000000000000..c41f53e74277 --- /dev/null +++ b/drivers/nvdimm/nd.h @@ -0,0 +1,220 @@ +/* + * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ +#ifndef __ND_H__ +#define __ND_H__ +#include <linux/libnvdimm.h> +#include <linux/blkdev.h> +#include <linux/device.h> +#include <linux/mutex.h> +#include <linux/ndctl.h> +#include <linux/types.h> +#include "label.h" + +enum { + /* + * Limits the maximum number of block apertures a dimm can + * support and is an input to the geometry/on-disk-format of a + * BTT instance + */ + ND_MAX_LANES = 256, + SECTOR_SHIFT = 9, + INT_LBASIZE_ALIGNMENT = 64, +}; + +struct nvdimm_drvdata { + struct device *dev; + int nsindex_size; + struct nd_cmd_get_config_size nsarea; + void *data; + int ns_current, ns_next; + struct resource dpa; + struct kref kref; +}; + +struct nd_region_namespaces { + int count; + int active; +}; + +static inline struct nd_namespace_index *to_namespace_index( + struct nvdimm_drvdata *ndd, int i) +{ + if (i < 0) + return NULL; + + return ndd->data + sizeof_namespace_index(ndd) * i; +} + +static inline struct nd_namespace_index *to_current_namespace_index( + struct nvdimm_drvdata *ndd) +{ + return to_namespace_index(ndd, ndd->ns_current); +} + +static inline struct nd_namespace_index *to_next_namespace_index( + struct nvdimm_drvdata *ndd) +{ + return to_namespace_index(ndd, ndd->ns_next); +} + +#define nd_dbg_dpa(r, d, res, fmt, arg...) \ + dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \ + (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \ + (unsigned long long) (res ? resource_size(res) : 0), \ + (unsigned long long) (res ? res->start : 0), ##arg) + +#define for_each_label(l, label, labels) \ + for (l = 0; (label = labels ? labels[l] : NULL); l++) + +#define for_each_dpa_resource(ndd, res) \ + for (res = (ndd)->dpa.child; res; res = res->sibling) + +#define for_each_dpa_resource_safe(ndd, res, next) \ + for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \ + res; res = next, next = next ? next->sibling : NULL) + +struct nd_percpu_lane { + int count; + spinlock_t lock; +}; + +struct nd_region { + struct device dev; + struct ida ns_ida; + struct ida btt_ida; + struct device *ns_seed; + struct device *btt_seed; + u16 ndr_mappings; + u64 ndr_size; + u64 ndr_start; + int id, num_lanes, ro, numa_node; + void *provider_data; + struct nd_interleave_set *nd_set; + struct nd_percpu_lane __percpu *lane; + struct nd_mapping mapping[0]; +}; + +struct nd_blk_region { + int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev); + void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev); + int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa, + void *iobuf, u64 len, int rw); + void *blk_provider_data; + struct nd_region nd_region; +}; + +/* + * Lookup next in the repeating sequence of 01, 10, and 11. + */ +static inline unsigned nd_inc_seq(unsigned seq) +{ + static const unsigned next[] = { 0, 2, 3, 1 }; + + return next[seq & 3]; +} + +struct btt; +struct nd_btt { + struct device dev; + struct nd_namespace_common *ndns; + struct btt *btt; + unsigned long lbasize; + u8 *uuid; + int id; +}; + +enum nd_async_mode { + ND_SYNC, + ND_ASYNC, +}; + +int nd_integrity_init(struct gendisk *disk, unsigned long meta_size); +void wait_nvdimm_bus_probe_idle(struct device *dev); +void nd_device_register(struct device *dev); +void nd_device_unregister(struct device *dev, enum nd_async_mode mode); +int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf, + size_t len); +ssize_t nd_sector_size_show(unsigned long current_lbasize, + const unsigned long *supported, char *buf); +ssize_t nd_sector_size_store(struct device *dev, const char *buf, + unsigned long *current_lbasize, const unsigned long *supported); +int __init nvdimm_init(void); +int __init nd_region_init(void); +void nvdimm_exit(void); +void nd_region_exit(void); +struct nvdimm; +struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping); +int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd); +int nvdimm_init_config_data(struct nvdimm_drvdata *ndd); +int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, + void *buf, size_t len); +struct nd_btt *to_nd_btt(struct device *dev); +struct btt_sb; +u64 nd_btt_sb_checksum(struct btt_sb *btt_sb); +#if IS_ENABLED(CONFIG_BTT) +int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata); +bool is_nd_btt(struct device *dev); +struct device *nd_btt_create(struct nd_region *nd_region); +#else +static inline nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata) +{ + return -ENODEV; +} + +static inline bool is_nd_btt(struct device *dev) +{ + return false; +} + +static inline struct device *nd_btt_create(struct nd_region *nd_region) +{ + return NULL; +} + +#endif +struct nd_region *to_nd_region(struct device *dev); +int nd_region_to_nstype(struct nd_region *nd_region); +int nd_region_register_namespaces(struct nd_region *nd_region, int *err); +u64 nd_region_interleave_set_cookie(struct nd_region *nd_region); +void nvdimm_bus_lock(struct device *dev); +void nvdimm_bus_unlock(struct device *dev); +bool is_nvdimm_bus_locked(struct device *dev); +int nvdimm_revalidate_disk(struct gendisk *disk); +void nvdimm_drvdata_release(struct kref *kref); +void put_ndd(struct nvdimm_drvdata *ndd); +int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd); +void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res); +struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, + struct nd_label_id *label_id, resource_size_t start, + resource_size_t n); +resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns); +struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev); +int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns); +int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns); +const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, + char *name); +int nd_blk_region_init(struct nd_region *nd_region); +void __nd_iostat_start(struct bio *bio, unsigned long *start); +static inline bool nd_iostat_start(struct bio *bio, unsigned long *start) +{ + struct gendisk *disk = bio->bi_bdev->bd_disk; + + if (!blk_queue_io_stat(disk->queue)) + return false; + + __nd_iostat_start(bio, start); + return true; +} +void nd_iostat_end(struct bio *bio, unsigned long start); +resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk); +#endif /* __ND_H__ */ |