libnvdimm, pfn: 'struct page' provider infrastructure
Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
336
drivers/nvdimm/pfn_devs.c
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336
drivers/nvdimm/pfn_devs.c
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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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#include <linux/blkdev.h>
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#include <linux/device.h>
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#include <linux/genhd.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include "nd-core.h"
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#include "pfn.h"
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#include "nd.h"
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static void nd_pfn_release(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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dev_dbg(dev, "%s\n", __func__);
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nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
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ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
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kfree(nd_pfn->uuid);
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kfree(nd_pfn);
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}
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static struct device_type nd_pfn_device_type = {
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.name = "nd_pfn",
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.release = nd_pfn_release,
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};
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bool is_nd_pfn(struct device *dev)
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{
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return dev ? dev->type == &nd_pfn_device_type : false;
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}
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EXPORT_SYMBOL(is_nd_pfn);
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struct nd_pfn *to_nd_pfn(struct device *dev)
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{
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struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev);
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WARN_ON(!is_nd_pfn(dev));
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return nd_pfn;
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}
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EXPORT_SYMBOL(to_nd_pfn);
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static ssize_t mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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switch (nd_pfn->mode) {
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case PFN_MODE_RAM:
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return sprintf(buf, "ram\n");
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case PFN_MODE_PMEM:
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return sprintf(buf, "pmem\n");
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default:
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return sprintf(buf, "none\n");
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}
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}
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static ssize_t mode_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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ssize_t rc = 0;
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device_lock(dev);
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nvdimm_bus_lock(dev);
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if (dev->driver)
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rc = -EBUSY;
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else {
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size_t n = len - 1;
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if (strncmp(buf, "pmem\n", n) == 0
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|| strncmp(buf, "pmem", n) == 0) {
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/* TODO: allocate from PMEM support */
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rc = -ENOTTY;
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} else if (strncmp(buf, "ram\n", n) == 0
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|| strncmp(buf, "ram", n) == 0)
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nd_pfn->mode = PFN_MODE_RAM;
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else if (strncmp(buf, "none\n", n) == 0
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|| strncmp(buf, "none", n) == 0)
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nd_pfn->mode = PFN_MODE_NONE;
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else
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rc = -EINVAL;
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}
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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nvdimm_bus_unlock(dev);
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device_unlock(dev);
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return rc ? rc : len;
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}
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static DEVICE_ATTR_RW(mode);
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static ssize_t uuid_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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if (nd_pfn->uuid)
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return sprintf(buf, "%pUb\n", nd_pfn->uuid);
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return sprintf(buf, "\n");
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}
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static ssize_t uuid_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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ssize_t rc;
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device_lock(dev);
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rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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return rc ? rc : len;
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}
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static DEVICE_ATTR_RW(uuid);
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static ssize_t namespace_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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rc = sprintf(buf, "%s\n", nd_pfn->ndns
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? dev_name(&nd_pfn->ndns->dev) : "");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static ssize_t namespace_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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device_lock(dev);
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rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RW(namespace);
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static struct attribute *nd_pfn_attributes[] = {
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&dev_attr_mode.attr,
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&dev_attr_namespace.attr,
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&dev_attr_uuid.attr,
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NULL,
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};
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static struct attribute_group nd_pfn_attribute_group = {
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.attrs = nd_pfn_attributes,
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};
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static const struct attribute_group *nd_pfn_attribute_groups[] = {
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&nd_pfn_attribute_group,
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&nd_device_attribute_group,
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&nd_numa_attribute_group,
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NULL,
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};
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static struct device *__nd_pfn_create(struct nd_region *nd_region,
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u8 *uuid, enum nd_pfn_mode mode,
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struct nd_namespace_common *ndns)
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{
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struct nd_pfn *nd_pfn;
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struct device *dev;
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/* we can only create pages for contiguous ranged of pmem */
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if (!is_nd_pmem(&nd_region->dev))
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return NULL;
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nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
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if (!nd_pfn)
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return NULL;
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nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
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if (nd_pfn->id < 0) {
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kfree(nd_pfn);
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return NULL;
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}
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nd_pfn->mode = mode;
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if (uuid)
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uuid = kmemdup(uuid, 16, GFP_KERNEL);
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nd_pfn->uuid = uuid;
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dev = &nd_pfn->dev;
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dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
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dev->parent = &nd_region->dev;
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dev->type = &nd_pfn_device_type;
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dev->groups = nd_pfn_attribute_groups;
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device_initialize(&nd_pfn->dev);
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if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
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dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
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__func__, dev_name(ndns->claim));
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put_device(dev);
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return NULL;
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}
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return dev;
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}
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struct device *nd_pfn_create(struct nd_region *nd_region)
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{
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struct device *dev = __nd_pfn_create(nd_region, NULL, PFN_MODE_NONE,
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NULL);
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if (dev)
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__nd_device_register(dev);
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return dev;
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}
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static int nd_pfn_validate(struct nd_pfn *nd_pfn)
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{
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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struct nd_namespace_io *nsio;
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u64 checksum, offset;
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if (!pfn_sb || !ndns)
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return -ENODEV;
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if (!is_nd_pmem(nd_pfn->dev.parent))
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return -ENODEV;
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/* section alignment for simple hotplug */
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if (nvdimm_namespace_capacity(ndns) < ND_PFN_ALIGN)
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return -ENODEV;
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if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)))
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return -ENXIO;
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if (memcmp(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN) != 0)
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return -ENODEV;
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checksum = le64_to_cpu(pfn_sb->checksum);
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pfn_sb->checksum = 0;
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if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb))
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return -ENODEV;
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pfn_sb->checksum = cpu_to_le64(checksum);
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switch (le32_to_cpu(pfn_sb->mode)) {
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case PFN_MODE_RAM:
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break;
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case PFN_MODE_PMEM:
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/* TODO: allocate from PMEM support */
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return -ENOTTY;
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default:
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return -ENXIO;
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}
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if (!nd_pfn->uuid) {
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/* from probe we allocate */
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nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);
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if (!nd_pfn->uuid)
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return -ENOMEM;
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} else {
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/* from init we validate */
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if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
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return -EINVAL;
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}
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/*
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* These warnings are verbose because they can only trigger in
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* the case where the physical address alignment of the
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* namespace has changed since the pfn superblock was
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* established.
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*/
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offset = le64_to_cpu(pfn_sb->dataoff);
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nsio = to_nd_namespace_io(&ndns->dev);
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if ((nsio->res.start + offset) & (ND_PFN_ALIGN - 1)) {
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dev_err(&nd_pfn->dev,
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"init failed: %s with offset %#llx not section aligned\n",
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dev_name(&ndns->dev), offset);
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return -EBUSY;
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} else if (offset >= resource_size(&nsio->res)) {
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dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
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dev_name(&ndns->dev));
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return -EBUSY;
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}
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return 0;
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}
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int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
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{
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int rc;
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struct device *dev;
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struct nd_pfn *nd_pfn;
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struct nd_pfn_sb *pfn_sb;
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struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
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if (ndns->force_raw)
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return -ENODEV;
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nvdimm_bus_lock(&ndns->dev);
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dev = __nd_pfn_create(nd_region, NULL, PFN_MODE_NONE, ndns);
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nvdimm_bus_unlock(&ndns->dev);
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if (!dev)
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return -ENOMEM;
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dev_set_drvdata(dev, drvdata);
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pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
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nd_pfn = to_nd_pfn(dev);
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nd_pfn->pfn_sb = pfn_sb;
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rc = nd_pfn_validate(nd_pfn);
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nd_pfn->pfn_sb = NULL;
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kfree(pfn_sb);
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dev_dbg(&ndns->dev, "%s: pfn: %s\n", __func__,
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rc == 0 ? dev_name(dev) : "<none>");
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if (rc < 0) {
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__nd_detach_ndns(dev, &nd_pfn->ndns);
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put_device(dev);
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} else
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__nd_device_register(&nd_pfn->dev);
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return rc;
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}
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EXPORT_SYMBOL(nd_pfn_probe);
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