466 lines
10 KiB
C
466 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#include <linux/libnvdimm.h>
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#include <linux/badblocks.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/device.h>
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#include <linux/ctype.h>
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#include <linux/ndctl.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include "nd-core.h"
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#include "nd.h"
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LIST_HEAD(nvdimm_bus_list);
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DEFINE_MUTEX(nvdimm_bus_list_mutex);
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void nvdimm_bus_lock(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return;
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mutex_lock(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(nvdimm_bus_lock);
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void nvdimm_bus_unlock(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return;
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mutex_unlock(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(nvdimm_bus_unlock);
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bool is_nvdimm_bus_locked(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (!nvdimm_bus)
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return false;
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return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
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}
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EXPORT_SYMBOL(is_nvdimm_bus_locked);
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struct nvdimm_map {
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struct nvdimm_bus *nvdimm_bus;
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struct list_head list;
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resource_size_t offset;
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unsigned long flags;
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size_t size;
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union {
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void *mem;
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void __iomem *iomem;
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};
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struct kref kref;
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};
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static struct nvdimm_map *find_nvdimm_map(struct device *dev,
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resource_size_t offset)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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struct nvdimm_map *nvdimm_map;
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list_for_each_entry(nvdimm_map, &nvdimm_bus->mapping_list, list)
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if (nvdimm_map->offset == offset)
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return nvdimm_map;
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return NULL;
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}
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static struct nvdimm_map *alloc_nvdimm_map(struct device *dev,
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resource_size_t offset, size_t size, unsigned long flags)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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struct nvdimm_map *nvdimm_map;
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nvdimm_map = kzalloc(sizeof(*nvdimm_map), GFP_KERNEL);
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if (!nvdimm_map)
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return NULL;
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INIT_LIST_HEAD(&nvdimm_map->list);
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nvdimm_map->nvdimm_bus = nvdimm_bus;
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nvdimm_map->offset = offset;
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nvdimm_map->flags = flags;
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nvdimm_map->size = size;
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kref_init(&nvdimm_map->kref);
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if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) {
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dev_err(&nvdimm_bus->dev, "failed to request %pa + %zd for %s\n",
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&offset, size, dev_name(dev));
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goto err_request_region;
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}
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if (flags)
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nvdimm_map->mem = memremap(offset, size, flags);
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else
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nvdimm_map->iomem = ioremap(offset, size);
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if (!nvdimm_map->mem)
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goto err_map;
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dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), "%s: bus unlocked!",
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__func__);
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list_add(&nvdimm_map->list, &nvdimm_bus->mapping_list);
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return nvdimm_map;
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err_map:
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release_mem_region(offset, size);
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err_request_region:
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kfree(nvdimm_map);
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return NULL;
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}
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static void nvdimm_map_release(struct kref *kref)
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{
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struct nvdimm_bus *nvdimm_bus;
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struct nvdimm_map *nvdimm_map;
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nvdimm_map = container_of(kref, struct nvdimm_map, kref);
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nvdimm_bus = nvdimm_map->nvdimm_bus;
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dev_dbg(&nvdimm_bus->dev, "%pa\n", &nvdimm_map->offset);
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list_del(&nvdimm_map->list);
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if (nvdimm_map->flags)
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memunmap(nvdimm_map->mem);
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else
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iounmap(nvdimm_map->iomem);
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release_mem_region(nvdimm_map->offset, nvdimm_map->size);
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kfree(nvdimm_map);
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}
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static void nvdimm_map_put(void *data)
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{
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struct nvdimm_map *nvdimm_map = data;
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struct nvdimm_bus *nvdimm_bus = nvdimm_map->nvdimm_bus;
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nvdimm_bus_lock(&nvdimm_bus->dev);
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kref_put(&nvdimm_map->kref, nvdimm_map_release);
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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/**
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* devm_nvdimm_memremap - map a resource that is shared across regions
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* @dev: device that will own a reference to the shared mapping
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* @offset: physical base address of the mapping
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* @size: mapping size
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* @flags: memremap flags, or, if zero, perform an ioremap instead
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*/
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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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{
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struct nvdimm_map *nvdimm_map;
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nvdimm_bus_lock(dev);
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nvdimm_map = find_nvdimm_map(dev, offset);
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if (!nvdimm_map)
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nvdimm_map = alloc_nvdimm_map(dev, offset, size, flags);
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else
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kref_get(&nvdimm_map->kref);
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nvdimm_bus_unlock(dev);
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if (!nvdimm_map)
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return NULL;
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if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map))
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return NULL;
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return nvdimm_map->mem;
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}
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EXPORT_SYMBOL_GPL(devm_nvdimm_memremap);
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u64 nd_fletcher64(void *addr, size_t len, bool le)
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{
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u32 *buf = addr;
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u32 lo32 = 0;
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u64 hi32 = 0;
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int i;
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for (i = 0; i < len / sizeof(u32); i++) {
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lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
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hi32 += lo32;
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}
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return hi32 << 32 | lo32;
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}
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EXPORT_SYMBOL_GPL(nd_fletcher64);
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struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
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{
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/* struct nvdimm_bus definition is private to libnvdimm */
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return nvdimm_bus->nd_desc;
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}
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EXPORT_SYMBOL_GPL(to_nd_desc);
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struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus)
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{
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/* struct nvdimm_bus definition is private to libnvdimm */
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return &nvdimm_bus->dev;
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}
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EXPORT_SYMBOL_GPL(to_nvdimm_bus_dev);
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static bool is_uuid_sep(char sep)
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{
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if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
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return true;
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return false;
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}
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static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
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size_t len)
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{
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const char *str = buf;
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u8 uuid[16];
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int i;
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for (i = 0; i < 16; i++) {
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if (!isxdigit(str[0]) || !isxdigit(str[1])) {
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dev_dbg(dev, "pos: %d buf[%zd]: %c buf[%zd]: %c\n",
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i, str - buf, str[0],
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str + 1 - buf, str[1]);
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return -EINVAL;
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}
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uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
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str += 2;
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if (is_uuid_sep(*str))
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str++;
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}
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memcpy(uuid_out, uuid, sizeof(uuid));
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return 0;
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}
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/**
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* nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
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* @dev: container device for the uuid property
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* @uuid_out: uuid buffer to replace
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* @buf: raw sysfs buffer to parse
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*
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* Enforce that uuids can only be changed while the device is disabled
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* (driver detached)
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* LOCKING: expects device_lock() is held on entry
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*/
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int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
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size_t len)
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{
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u8 uuid[16];
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int rc;
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if (dev->driver)
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return -EBUSY;
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rc = nd_uuid_parse(dev, uuid, buf, len);
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if (rc)
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return rc;
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kfree(*uuid_out);
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*uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
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if (!(*uuid_out))
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return -ENOMEM;
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return 0;
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}
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ssize_t nd_size_select_show(unsigned long current_size,
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const unsigned long *supported, char *buf)
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{
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ssize_t len = 0;
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int i;
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for (i = 0; supported[i]; i++)
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if (current_size == supported[i])
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len += sprintf(buf + len, "[%ld] ", supported[i]);
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else
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len += sprintf(buf + len, "%ld ", supported[i]);
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len += sprintf(buf + len, "\n");
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return len;
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}
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ssize_t nd_size_select_store(struct device *dev, const char *buf,
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unsigned long *current_size, const unsigned long *supported)
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{
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unsigned long lbasize;
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int rc, i;
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if (dev->driver)
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return -EBUSY;
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rc = kstrtoul(buf, 0, &lbasize);
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if (rc)
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return rc;
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for (i = 0; supported[i]; i++)
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if (lbasize == supported[i])
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break;
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if (supported[i]) {
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*current_size = lbasize;
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return 0;
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} else {
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return -EINVAL;
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}
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}
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static ssize_t commands_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int cmd, len = 0;
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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for_each_set_bit(cmd, &nd_desc->cmd_mask, BITS_PER_LONG)
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len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
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len += sprintf(buf + len, "\n");
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return len;
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}
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static DEVICE_ATTR_RO(commands);
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static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
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{
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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struct device *parent = nvdimm_bus->dev.parent;
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if (nd_desc->provider_name)
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return nd_desc->provider_name;
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else if (parent)
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return dev_name(parent);
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else
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return "unknown";
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}
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static ssize_t provider_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
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}
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static DEVICE_ATTR_RO(provider);
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static int flush_namespaces(struct device *dev, void *data)
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{
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device_lock(dev);
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device_unlock(dev);
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return 0;
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}
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static int flush_regions_dimms(struct device *dev, void *data)
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{
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device_lock(dev);
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device_unlock(dev);
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device_for_each_child(dev, NULL, flush_namespaces);
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return 0;
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}
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static ssize_t wait_probe_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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int rc;
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if (nd_desc->flush_probe) {
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rc = nd_desc->flush_probe(nd_desc);
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if (rc)
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return rc;
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}
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nd_synchronize();
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device_for_each_child(dev, NULL, flush_regions_dimms);
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return sprintf(buf, "1\n");
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}
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static DEVICE_ATTR_RO(wait_probe);
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static struct attribute *nvdimm_bus_attributes[] = {
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&dev_attr_commands.attr,
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&dev_attr_wait_probe.attr,
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&dev_attr_provider.attr,
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NULL,
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};
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struct attribute_group nvdimm_bus_attribute_group = {
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.attrs = nvdimm_bus_attributes,
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};
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EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
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int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
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{
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return badrange_add(&nvdimm_bus->badrange, addr, length);
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}
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EXPORT_SYMBOL_GPL(nvdimm_bus_add_badrange);
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
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{
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struct blk_integrity bi;
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if (meta_size == 0)
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return 0;
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memset(&bi, 0, sizeof(bi));
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bi.tuple_size = meta_size;
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bi.tag_size = meta_size;
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blk_integrity_register(disk, &bi);
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blk_queue_max_integrity_segments(disk->queue, 1);
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return 0;
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}
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EXPORT_SYMBOL(nd_integrity_init);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
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{
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return 0;
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}
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EXPORT_SYMBOL(nd_integrity_init);
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#endif
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static __init int libnvdimm_init(void)
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{
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int rc;
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rc = nvdimm_bus_init();
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if (rc)
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return rc;
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rc = nvdimm_init();
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if (rc)
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goto err_dimm;
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rc = nd_region_init();
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if (rc)
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goto err_region;
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nd_label_init();
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return 0;
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err_region:
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nvdimm_exit();
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err_dimm:
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nvdimm_bus_exit();
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return rc;
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}
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static __exit void libnvdimm_exit(void)
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{
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WARN_ON(!list_empty(&nvdimm_bus_list));
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nd_region_exit();
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nvdimm_exit();
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nvdimm_bus_exit();
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nd_region_devs_exit();
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nvdimm_devs_exit();
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}
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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subsys_initcall(libnvdimm_init);
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module_exit(libnvdimm_exit);
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