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4d88a97aa9
* Implement the device-model infrastructure for loading modules and
attaching drivers to nvdimm devices. This is a simple association of a
nd-device-type number with a driver that has a bitmask of supported
device types. To facilitate userspace bind/unbind operations 'modalias'
and 'devtype', that also appear in the uevent, are added as generic
sysfs attributes for all nvdimm devices. The reason for the device-type
number is to support sub-types within a given parent devtype, be it a
vendor-specific sub-type or otherwise.
* The first consumer of this infrastructure is the driver
for dimm devices. It simply uses control messages to retrieve and
store the configuration-data image (label set) from each dimm.
Note: nd_device_register() arranges for asynchronous registration of
nvdimm bus devices by default.
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* libnvdimm - Non-volatile-memory Devices Subsystem
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*
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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 __LIBNVDIMM_H__
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#define __LIBNVDIMM_H__
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#include <linux/sizes.h>
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#include <linux/types.h>
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enum {
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/* when a dimm supports both PMEM and BLK access a label is required */
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NDD_ALIASING = 1 << 0,
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/* need to set a limit somewhere, but yes, this is likely overkill */
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ND_IOCTL_MAX_BUFLEN = SZ_4M,
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ND_CMD_MAX_ELEM = 4,
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ND_CMD_MAX_ENVELOPE = 16,
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ND_CMD_ARS_STATUS_MAX = SZ_4K,
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};
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extern struct attribute_group nvdimm_bus_attribute_group;
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extern struct attribute_group nvdimm_attribute_group;
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extern struct attribute_group nd_device_attribute_group;
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struct nvdimm;
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struct nvdimm_bus_descriptor;
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typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
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struct nvdimm *nvdimm, unsigned int cmd, void *buf,
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unsigned int buf_len);
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struct nvdimm_bus_descriptor {
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const struct attribute_group **attr_groups;
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unsigned long dsm_mask;
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char *provider_name;
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ndctl_fn ndctl;
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};
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struct nd_cmd_desc {
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int in_num;
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int out_num;
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u32 in_sizes[ND_CMD_MAX_ELEM];
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int out_sizes[ND_CMD_MAX_ELEM];
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};
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struct nvdimm_bus;
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struct device;
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struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
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struct nvdimm_bus_descriptor *nfit_desc);
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void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
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struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
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struct nvdimm *to_nvdimm(struct device *dev);
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struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
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const char *nvdimm_name(struct nvdimm *nvdimm);
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void *nvdimm_provider_data(struct nvdimm *nvdimm);
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struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
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const struct attribute_group **groups, unsigned long flags,
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unsigned long *dsm_mask);
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const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
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const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
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u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
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const struct nd_cmd_desc *desc, int idx, void *buf);
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u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
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const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
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const u32 *out_field);
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int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
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#endif /* __LIBNVDIMM_H__ */
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