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Commitcfe30b8720"libnvdimm, pmem: adjust for section collisions with 'System RAM'" enabled Linux to workaround occasions where platform firmware arranges for "System RAM" and "Persistent Memory" to collide within a single section boundary. Unfortunately, as reported in this issue [1], platform firmware can inflict the same collision between persistent memory regions. The approach of interrogating iomem_resource does not work in this case because platform firmware may merge multiple regions into a single iomem_resource range. Instead provide a method to interrogate regions that share the same parent bus. This is a stop-gap until the core-MM can grow support for hotplug on sub-section boundaries. [1]: https://github.com/pmem/ndctl/issues/76 Fixes:cfe30b8720("libnvdimm, pmem: adjust for section collisions with...") Cc: <stable@vger.kernel.org> Reported-by: Patrick Geary <patrickg@supermicro.com> Tested-by: Patrick Geary <patrickg@supermicro.com> Reviewed-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
136 lines
5.2 KiB
C
136 lines
5.2 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/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 list_head list;
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struct device dev;
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int id, probe_active;
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struct list_head mapping_list;
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struct mutex reconfig_mutex;
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struct badrange badrange;
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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 cmd_mask;
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struct device dev;
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atomic_t busy;
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int id, num_flush;
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struct resource *flush_wpq;
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};
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/**
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* struct blk_alloc_info - tracking info for BLK dpa scanning
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* @nd_mapping: blk region mapping boundaries
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* @available: decremented in alias_dpa_busy as aliased PMEM is scanned
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* @busy: decremented in blk_dpa_busy to account for ranges already
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* handled by alias_dpa_busy
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* @res: alias_dpa_busy interprets this a free space range that needs to
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* be truncated to the valid BLK allocation starting DPA, blk_dpa_busy
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* treats it as a busy range that needs the aliased PMEM ranges
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* truncated.
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*/
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struct blk_alloc_info {
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struct nd_mapping *nd_mapping;
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resource_size_t available, busy;
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struct resource *res;
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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_volatile(struct device *dev);
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bool is_nd_blk(struct device *dev);
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static inline bool is_nd_region(struct device *dev)
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{
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return is_nd_pmem(dev) || is_nd_blk(dev) || is_nd_volatile(dev);
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}
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static inline bool is_memory(struct device *dev)
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{
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return is_nd_pmem(dev) || is_nd_volatile(dev);
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}
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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 nvdimm_devs_exit(void);
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void nd_region_devs_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_ns_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_create_pfn_seed(struct nd_region *nd_region);
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void nd_region_create_dax_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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void nd_mapping_free_labels(struct nd_mapping *nd_mapping);
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int __reserve_free_pmem(struct device *dev, void *data);
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void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
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struct nd_mapping *nd_mapping);
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resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
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struct nd_mapping *nd_mapping);
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resource_size_t nd_region_allocatable_dpa(struct nd_region *nd_region);
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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_region *nd_region);
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resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
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int nd_region_conflict(struct nd_region *nd_region, resource_size_t start,
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resource_size_t size);
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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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int alias_dpa_busy(struct device *dev, void *data);
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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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void nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
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void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns);
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bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns);
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bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns);
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ssize_t nd_namespace_store(struct device *dev,
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struct nd_namespace_common **_ndns, const char *buf,
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size_t len);
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struct nd_pfn *to_nd_pfn_safe(struct device *dev);
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#endif /* __ND_CORE_H__ */
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