289 lines
9.4 KiB
C
289 lines
9.4 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/kernel.h>
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#include <linux/sizes.h>
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#include <linux/types.h>
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#include <linux/uuid.h>
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#include <linux/spinlock.h>
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struct badrange_entry {
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u64 start;
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u64 length;
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struct list_head list;
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};
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struct badrange {
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struct list_head list;
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spinlock_t lock;
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};
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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 = 0,
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/* unarmed memory devices may not persist writes */
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NDD_UNARMED = 1,
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/* locked memory devices should not be accessed */
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NDD_LOCKED = 2,
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/* memory under security wipes should not be accessed */
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NDD_SECURITY_OVERWRITE = 3,
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/* tracking whether or not there is a pending device reference */
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NDD_WORK_PENDING = 4,
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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 = 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 */
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ND_REGION_PAGEMAP = 0,
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/*
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* Platform ensures entire CPU store data path is flushed to pmem on
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* system power loss.
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*/
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ND_REGION_PERSIST_CACHE = 1,
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/*
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* Platform provides mechanisms to automatically flush outstanding
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* write data from memory controler to pmem on system power loss.
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* (ADR)
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*/
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ND_REGION_PERSIST_MEMCTRL = 2,
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/* mark newly adjusted resources as requiring a label update */
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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;
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extern struct attribute_group nd_mapping_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, int *cmd_rc);
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struct device_node;
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struct nvdimm_bus_descriptor {
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const struct attribute_group **attr_groups;
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unsigned long bus_dsm_mask;
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unsigned long cmd_mask;
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struct module *module;
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char *provider_name;
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struct device_node *of_node;
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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,
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struct nvdimm *nvdimm, unsigned int cmd, void *data);
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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 nd_interleave_set {
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/* v1.1 definition of the interleave-set-cookie algorithm */
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u64 cookie1;
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/* v1.2 definition of the interleave-set-cookie algorithm */
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u64 cookie2;
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/* compatibility with initial buggy Linux implementation */
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u64 altcookie;
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guid_t type_guid;
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};
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struct nd_mapping_desc {
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struct nvdimm *nvdimm;
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u64 start;
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u64 size;
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int position;
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};
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struct nd_region_desc {
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struct resource *res;
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struct nd_mapping_desc *mapping;
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u16 num_mappings;
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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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struct device_node *of_node;
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};
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struct device;
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void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
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size_t size, unsigned long flags);
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static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
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resource_size_t offset, size_t size)
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{
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return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
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}
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struct nvdimm_bus;
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struct module;
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struct device;
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struct nd_blk_region;
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struct nd_blk_region_desc {
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int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
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void *iobuf, u64 len, int rw);
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struct nd_region_desc ndr_desc;
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};
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static inline struct nd_blk_region_desc *to_blk_region_desc(
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struct nd_region_desc *ndr_desc)
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{
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return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
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}
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enum nvdimm_security_state {
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NVDIMM_SECURITY_DISABLED,
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NVDIMM_SECURITY_UNLOCKED,
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NVDIMM_SECURITY_LOCKED,
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NVDIMM_SECURITY_FROZEN,
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NVDIMM_SECURITY_OVERWRITE,
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};
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#define NVDIMM_PASSPHRASE_LEN 32
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#define NVDIMM_KEY_DESC_LEN 22
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struct nvdimm_key_data {
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u8 data[NVDIMM_PASSPHRASE_LEN];
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};
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enum nvdimm_passphrase_type {
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NVDIMM_USER,
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NVDIMM_MASTER,
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};
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struct nvdimm_security_ops {
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enum nvdimm_security_state (*state)(struct nvdimm *nvdimm,
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enum nvdimm_passphrase_type pass_type);
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int (*freeze)(struct nvdimm *nvdimm);
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int (*change_key)(struct nvdimm *nvdimm,
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const struct nvdimm_key_data *old_data,
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const struct nvdimm_key_data *new_data,
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enum nvdimm_passphrase_type pass_type);
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int (*unlock)(struct nvdimm *nvdimm,
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const struct nvdimm_key_data *key_data);
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int (*disable)(struct nvdimm *nvdimm,
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const struct nvdimm_key_data *key_data);
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int (*erase)(struct nvdimm *nvdimm,
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const struct nvdimm_key_data *key_data,
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enum nvdimm_passphrase_type pass_type);
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int (*overwrite)(struct nvdimm *nvdimm,
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const struct nvdimm_key_data *key_data);
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int (*query_overwrite)(struct nvdimm *nvdimm);
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};
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void badrange_init(struct badrange *badrange);
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int badrange_add(struct badrange *badrange, u64 addr, u64 length);
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void badrange_forget(struct badrange *badrange, phys_addr_t start,
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unsigned int len);
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int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
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u64 length);
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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_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
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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 device *nd_region_dev(struct nd_region *nd_region);
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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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struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
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const char *nvdimm_name(struct nvdimm *nvdimm);
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struct kobject *nvdimm_kobj(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);
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struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
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void *provider_data, const struct attribute_group **groups,
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unsigned long flags, unsigned long cmd_mask, int num_flush,
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struct resource *flush_wpq, const char *dimm_id,
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const struct nvdimm_security_ops *sec_ops);
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static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
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void *provider_data, const struct attribute_group **groups,
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unsigned long flags, unsigned long cmd_mask, int num_flush,
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struct resource *flush_wpq)
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{
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return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
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cmd_mask, num_flush, flush_wpq, NULL, NULL);
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}
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int nvdimm_security_setup_events(struct nvdimm *nvdimm);
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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, unsigned long remainder);
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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,
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struct nd_region_desc *ndr_desc);
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struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
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struct nd_region_desc *ndr_desc);
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struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
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struct nd_region_desc *ndr_desc);
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void *nd_region_provider_data(struct nd_region *nd_region);
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void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
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void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
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struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
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unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
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unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
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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);
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int nvdimm_has_flush(struct nd_region *nd_region);
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int nvdimm_has_cache(struct nd_region *nd_region);
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int nvdimm_in_overwrite(struct nvdimm *nvdimm);
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static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
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unsigned int buf_len, int *cmd_rc)
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{
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struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
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struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
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return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
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}
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#ifdef CONFIG_ARCH_HAS_PMEM_API
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#define ARCH_MEMREMAP_PMEM MEMREMAP_WB
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void arch_wb_cache_pmem(void *addr, size_t size);
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void arch_invalidate_pmem(void *addr, size_t size);
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#else
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#define ARCH_MEMREMAP_PMEM MEMREMAP_WT
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static inline void arch_wb_cache_pmem(void *addr, size_t size)
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{
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}
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static inline void arch_invalidate_pmem(void *addr, size_t size)
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{
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}
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#endif
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#endif /* __LIBNVDIMM_H__ */
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