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On platforms that have firmware support for reading/writing per-dimm label space, a portion of the dimm may be accessible via an interleave set PMEM mapping in addition to the dimm's BLK (block-data-window aperture(s)) interface. A label, stored in a "configuration data region" on the dimm, disambiguates which dimm addresses are accessed through which exclusive interface. Add infrastructure that allows the kernel to block modifications to a label in the set while any member dimm is active. Note that this is meant only for enforcing "no modifications of active labels" via the coarse ioctl command. Adding/deleting namespaces from an active interleave set is always possible via sysfs. Another aspect of tracking interleave sets is tracking their integrity when DIMMs in a set are physically re-ordered. For this purpose we generate an "interleave-set cookie" that can be recorded in a label and validated against the current configuration. It is the bus provider implementation's responsibility to calculate the interleave set cookie and attach it to a given region. Cc: Neil Brown <neilb@suse.de> Cc: <linux-acpi@vger.kernel.org> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Robert Moore <robert.moore@intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
60 lines
1.9 KiB
C
60 lines
1.9 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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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_blk(struct device *dev);
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bool is_nd_pmem(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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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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int nd_match_dimm(struct device *dev, void *data);
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#endif /* __ND_CORE_H__ */
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