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![Vishal Verma](/assets/img/avatar_default.png)
nsio_rw_bytes can clear media errors, but this cannot be done while we are in an atomic context due to locking within ACPI. From the BTT, ->rw_bytes may be called either from atomic or process context depending on whether the calls happen during initialization or during IO. During init, we want to ensure error clearing happens, and the flag marking process context allows nsio_rw_bytes to do that. When called during IO, we're in atomic context, and error clearing can be skipped. Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
323 lines
8 KiB
C
323 lines
8 KiB
C
/*
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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 "btt.h"
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#include "nd.h"
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static void nd_btt_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_btt *nd_btt = to_nd_btt(dev);
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dev_dbg(dev, "%s\n", __func__);
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nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
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ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
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kfree(nd_btt->uuid);
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kfree(nd_btt);
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}
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static struct device_type nd_btt_device_type = {
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.name = "nd_btt",
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.release = nd_btt_release,
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};
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bool is_nd_btt(struct device *dev)
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{
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return dev->type == &nd_btt_device_type;
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}
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EXPORT_SYMBOL(is_nd_btt);
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struct nd_btt *to_nd_btt(struct device *dev)
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{
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struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
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WARN_ON(!is_nd_btt(dev));
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return nd_btt;
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}
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EXPORT_SYMBOL(to_nd_btt);
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static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
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4096, 4104, 4160, 4224, 0 };
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static ssize_t sector_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf);
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}
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static ssize_t sector_size_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_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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device_lock(dev);
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nvdimm_bus_lock(dev);
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rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize,
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btt_lbasize_supported);
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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(sector_size);
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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_btt *nd_btt = to_nd_btt(dev);
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if (nd_btt->uuid)
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return sprintf(buf, "%pUb\n", nd_btt->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_btt *nd_btt = to_nd_btt(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_btt->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_btt *nd_btt = to_nd_btt(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_btt->ndns
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? dev_name(&nd_btt->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_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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device_lock(dev);
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nvdimm_bus_lock(dev);
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rc = nd_namespace_store(dev, &nd_btt->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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nvdimm_bus_unlock(dev);
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device_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 ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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device_lock(dev);
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if (dev->driver)
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rc = sprintf(buf, "%llu\n", nd_btt->size);
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else {
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/* no size to convey if the btt instance is disabled */
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rc = -ENXIO;
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}
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(size);
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static struct attribute *nd_btt_attributes[] = {
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&dev_attr_sector_size.attr,
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&dev_attr_namespace.attr,
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&dev_attr_uuid.attr,
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&dev_attr_size.attr,
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NULL,
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};
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static struct attribute_group nd_btt_attribute_group = {
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.attrs = nd_btt_attributes,
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};
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static const struct attribute_group *nd_btt_attribute_groups[] = {
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&nd_btt_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_btt_create(struct nd_region *nd_region,
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unsigned long lbasize, u8 *uuid,
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struct nd_namespace_common *ndns)
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{
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struct nd_btt *nd_btt;
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struct device *dev;
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nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
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if (!nd_btt)
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return NULL;
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nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
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if (nd_btt->id < 0) {
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kfree(nd_btt);
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return NULL;
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}
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nd_btt->lbasize = lbasize;
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if (uuid)
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uuid = kmemdup(uuid, 16, GFP_KERNEL);
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nd_btt->uuid = uuid;
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dev = &nd_btt->dev;
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dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
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dev->parent = &nd_region->dev;
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dev->type = &nd_btt_device_type;
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dev->groups = nd_btt_attribute_groups;
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device_initialize(&nd_btt->dev);
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if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->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_btt_create(struct nd_region *nd_region)
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{
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struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
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__nd_device_register(dev);
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return dev;
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}
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static bool uuid_is_null(u8 *uuid)
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{
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static const u8 null_uuid[16];
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return (memcmp(uuid, null_uuid, 16) == 0);
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}
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/**
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* nd_btt_arena_is_valid - check if the metadata layout is valid
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* @nd_btt: device with BTT geometry and backing device info
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* @super: pointer to the arena's info block being tested
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*
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* Check consistency of the btt info block with itself by validating
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* the checksum, and with the parent namespace by verifying the
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* parent_uuid contained in the info block with the one supplied in.
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*
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* Returns:
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* false for an invalid info block, true for a valid one
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*/
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bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
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{
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const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
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u64 checksum;
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if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
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return false;
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if (!uuid_is_null(super->parent_uuid))
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if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
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return false;
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checksum = le64_to_cpu(super->checksum);
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super->checksum = 0;
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if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
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return false;
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super->checksum = cpu_to_le64(checksum);
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/* TODO: figure out action for this */
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if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
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dev_info(&nd_btt->dev, "Found arena with an error flag\n");
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return true;
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}
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EXPORT_SYMBOL(nd_btt_arena_is_valid);
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static int __nd_btt_probe(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
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{
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if (!btt_sb || !ndns || !nd_btt)
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return -ENODEV;
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if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0))
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return -ENXIO;
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if (nvdimm_namespace_capacity(ndns) < SZ_16M)
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return -ENXIO;
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if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
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return -ENODEV;
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nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
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nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
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if (!nd_btt->uuid)
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return -ENOMEM;
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__nd_device_register(&nd_btt->dev);
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return 0;
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}
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int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns)
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{
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int rc;
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struct device *btt_dev;
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struct btt_sb *btt_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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btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
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nvdimm_bus_unlock(&ndns->dev);
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if (!btt_dev)
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return -ENOMEM;
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btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL);
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rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb);
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dev_dbg(dev, "%s: btt: %s\n", __func__,
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rc == 0 ? dev_name(btt_dev) : "<none>");
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if (rc < 0) {
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struct nd_btt *nd_btt = to_nd_btt(btt_dev);
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nd_detach_ndns(btt_dev, &nd_btt->ndns);
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put_device(btt_dev);
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}
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return rc;
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}
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EXPORT_SYMBOL(nd_btt_probe);
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