libnvdimm.h 5.9 KB
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/*
 * libnvdimm - Non-volatile-memory Devices Subsystem
 *
 * 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 __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
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#include <linux/kernel.h>
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#include <linux/sizes.h>
#include <linux/types.h>
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enum {
	/* when a dimm supports both PMEM and BLK access a label is required */
	NDD_ALIASING = 1 << 0,
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	/* unarmed memory devices may not persist writes */
	NDD_UNARMED = 1 << 1,
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	/* need to set a limit somewhere, but yes, this is likely overkill */
	ND_IOCTL_MAX_BUFLEN = SZ_4M,
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	ND_CMD_MAX_ELEM = 5,
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	ND_CMD_MAX_ENVELOPE = 256,
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	ND_MAX_MAPPINGS = 32,
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	/* region flag indicating to direct-map persistent memory by default */
	ND_REGION_PAGEMAP = 0,

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	/* mark newly adjusted resources as requiring a label update */
	DPA_RESOURCE_ADJUSTED = 1 << 0,
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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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extern struct attribute_group nd_numa_attribute_group;
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extern struct attribute_group nd_region_attribute_group;
extern struct attribute_group nd_mapping_attribute_group;
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struct nvdimm;
struct nvdimm_bus_descriptor;
typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
		struct nvdimm *nvdimm, unsigned int cmd, void *buf,
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		unsigned int buf_len, int *cmd_rc);
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struct nd_namespace_label;
struct nvdimm_drvdata;
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struct nd_mapping {
	struct nvdimm *nvdimm;
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	struct nd_namespace_label **labels;
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	u64 start;
	u64 size;
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	/*
	 * @ndd is for private use at region enable / disable time for
	 * get_ndd() + put_ndd(), all other nd_mapping to ndd
	 * conversions use to_ndd() which respects enabled state of the
	 * nvdimm.
	 */
	struct nvdimm_drvdata *ndd;
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};

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struct nvdimm_bus_descriptor {
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	const struct attribute_group **attr_groups;
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	unsigned long cmd_mask;
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	char *provider_name;
	ndctl_fn ndctl;
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	int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
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	int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
			struct nvdimm *nvdimm, unsigned int cmd);
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};

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struct nd_cmd_desc {
	int in_num;
	int out_num;
	u32 in_sizes[ND_CMD_MAX_ELEM];
	int out_sizes[ND_CMD_MAX_ELEM];
};

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struct nd_interleave_set {
	u64 cookie;
};

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struct nd_region_desc {
	struct resource *res;
	struct nd_mapping *nd_mapping;
	u16 num_mappings;
	const struct attribute_group **attr_groups;
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	struct nd_interleave_set *nd_set;
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	void *provider_data;
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	int num_lanes;
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	int numa_node;
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	unsigned long flags;
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};

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struct device;
void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
		size_t size, unsigned long flags);
static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
		resource_size_t offset, size_t size)
{
	return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
}

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struct nvdimm_bus;
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struct module;
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struct device;
struct nd_blk_region;
struct nd_blk_region_desc {
	int (*enable)(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);
	struct nd_region_desc ndr_desc;
};

static inline struct nd_blk_region_desc *to_blk_region_desc(
		struct nd_region_desc *ndr_desc)
{
	return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);

}

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int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length);
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struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
		struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
#define nvdimm_bus_register(parent, desc) \
	__nvdimm_bus_register(parent, desc, THIS_MODULE)
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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 nd_region *to_nd_region(struct device *dev);
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struct nd_blk_region *to_nd_blk_region(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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unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
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void *nvdimm_provider_data(struct nvdimm *nvdimm);
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 cmd_mask, int num_flush,
		struct resource *flush_wpq);
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const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, void *buf);
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
		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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struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc);
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void *nd_region_provider_data(struct nd_region *nd_region);
void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
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u64 nd_fletcher64(void *addr, size_t len, bool le);
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void nvdimm_flush(struct nd_region *nd_region);
int nvdimm_has_flush(struct nd_region *nd_region);
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#endif /* __LIBNVDIMM_H__ */