047fc8a1f9
The libnvdimm implementation handles allocating dimm address space (DPA) between PMEM and BLK mode interfaces. After DPA has been allocated from a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O as a struct bio based block device. Unlike PMEM, BLK is required to handle platform specific details like mmio register formats and memory controller interleave. For this reason the libnvdimm generic nd_blk driver calls back into the bus provider to carry out the I/O. This initial implementation handles the BLK interface defined by the ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from DCR (dimm control region), BDW (block data window), IDT (interleave descriptor) NFIT structures and the hardware register format. [1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf [2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jens Axboe <axboe@fb.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
84 lines
3 KiB
C
84 lines
3 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef __ND_CORE_H__
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#define __ND_CORE_H__
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#include <linux/libnvdimm.h>
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#include <linux/device.h>
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#include <linux/libnvdimm.h>
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#include <linux/sizes.h>
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#include <linux/mutex.h>
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#include <linux/nd.h>
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extern struct list_head nvdimm_bus_list;
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extern struct mutex nvdimm_bus_list_mutex;
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extern int nvdimm_major;
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struct nvdimm_bus {
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struct nvdimm_bus_descriptor *nd_desc;
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wait_queue_head_t probe_wait;
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struct module *module;
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struct list_head list;
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struct device dev;
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int id, probe_active;
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struct mutex reconfig_mutex;
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};
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struct nvdimm {
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unsigned long flags;
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void *provider_data;
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unsigned long *dsm_mask;
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struct device dev;
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atomic_t busy;
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int id;
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};
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bool is_nvdimm(struct device *dev);
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bool is_nd_pmem(struct device *dev);
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bool is_nd_blk(struct device *dev);
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struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
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int __init nvdimm_bus_init(void);
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void nvdimm_bus_exit(void);
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void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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struct nd_region;
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void nd_region_create_blk_seed(struct nd_region *nd_region);
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void nd_region_create_btt_seed(struct nd_region *nd_region);
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void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
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void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
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void nd_synchronize(void);
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int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
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int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
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int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
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void __nd_device_register(struct device *dev);
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int nd_match_dimm(struct device *dev, void *data);
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struct nd_label_id;
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char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags);
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bool nd_is_uuid_unique(struct device *dev, u8 *uuid);
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struct nd_region;
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struct nvdimm_drvdata;
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struct nd_mapping;
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resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
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struct nd_mapping *nd_mapping, resource_size_t *overlap);
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resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping);
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resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
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resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
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struct nd_label_id *label_id);
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struct nd_mapping;
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struct resource *nsblk_add_resource(struct nd_region *nd_region,
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struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
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resource_size_t start);
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int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd);
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void get_ndd(struct nvdimm_drvdata *ndd);
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resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
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#endif /* __ND_CORE_H__ */
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