![Christoph Hellwig](/assets/img/avatar_default.png)
Currently support for 64-bit sector_t and blkcnt_t is optional on 32-bit architectures. These types are required to support block device and/or file sizes larger than 2 TiB, and have generally defaulted to on for a long time. Enabling the option only increases the i386 tinyconfig size by 145 bytes, and many data structures already always use 64-bit values for their in-core and on-disk data structures anyway, so there should not be a large change in dynamic memory usage either. Dropping this option removes a somewhat weird non-default config that has cause various bugs or compiler warnings when actually used. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
800 lines
21 KiB
C
800 lines
21 KiB
C
/*
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* Copyright(c) 2013-2016 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/memremap.h>
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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, "trace\n");
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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_safe(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_safe(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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nd_pfn->mode = PFN_MODE_PMEM;
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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, "result: %zd wrote: %s%s", rc, buf,
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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 align_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_safe(dev);
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return sprintf(buf, "%ld\n", nd_pfn->align);
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}
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static const unsigned long *nd_pfn_supported_alignments(void)
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{
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/*
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* This needs to be a non-static variable because the *_SIZE
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* macros aren't always constants.
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*/
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const unsigned long supported_alignments[] = {
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PAGE_SIZE,
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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HPAGE_PMD_SIZE,
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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HPAGE_PUD_SIZE,
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#endif
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#endif
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0,
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};
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static unsigned long data[ARRAY_SIZE(supported_alignments)];
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memcpy(data, supported_alignments, sizeof(data));
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return data;
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}
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static ssize_t align_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_safe(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_size_select_store(dev, buf, &nd_pfn->align,
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nd_pfn_supported_alignments());
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dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
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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(align);
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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_safe(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_safe(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, "result: %zd wrote: %s%s", rc, buf,
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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_safe(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_safe(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_pfn->ndns, buf, len);
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dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
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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 resource_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_safe(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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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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u64 offset = __le64_to_cpu(pfn_sb->dataoff);
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start
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+ start_pad + offset);
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} else {
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/* no address to convey if the pfn 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(resource);
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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_pfn *nd_pfn = to_nd_pfn_safe(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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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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u64 offset = __le64_to_cpu(pfn_sb->dataoff);
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
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u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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rc = sprintf(buf, "%llu\n", (unsigned long long)
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resource_size(&nsio->res) - start_pad
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- end_trunc - offset);
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} else {
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/* no size to convey if the pfn 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 ssize_t supported_alignments_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return nd_size_select_show(0, nd_pfn_supported_alignments(), buf);
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}
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static DEVICE_ATTR_RO(supported_alignments);
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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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&dev_attr_align.attr,
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&dev_attr_resource.attr,
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&dev_attr_size.attr,
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&dev_attr_supported_alignments.attr,
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NULL,
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};
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static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n)
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{
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if (a == &dev_attr_resource.attr)
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return 0400;
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return a->mode;
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}
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struct attribute_group nd_pfn_attribute_group = {
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.attrs = nd_pfn_attributes,
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.is_visible = pfn_visible,
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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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struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
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struct nd_namespace_common *ndns)
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{
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struct device *dev;
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if (!nd_pfn)
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return NULL;
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nd_pfn->mode = PFN_MODE_NONE;
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nd_pfn->align = PFN_DEFAULT_ALIGNMENT;
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dev = &nd_pfn->dev;
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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, "failed, already claimed by %s\n",
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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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static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region)
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{
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struct nd_pfn *nd_pfn;
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struct device *dev;
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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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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->groups = nd_pfn_attribute_groups;
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dev->type = &nd_pfn_device_type;
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dev->parent = &nd_region->dev;
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return nd_pfn;
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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 nd_pfn *nd_pfn;
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struct device *dev;
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if (!is_memory(&nd_region->dev))
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return NULL;
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nd_pfn = nd_pfn_alloc(nd_region);
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dev = nd_pfn_devinit(nd_pfn, NULL);
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__nd_device_register(dev);
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return dev;
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}
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/*
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* nd_pfn_clear_memmap_errors() clears any errors in the volatile memmap
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* space associated with the namespace. If the memmap is set to DRAM, then
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* this is a no-op. Since the memmap area is freshly initialized during
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* probe, we have an opportunity to clear any badblocks in this area.
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*/
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static int nd_pfn_clear_memmap_errors(struct nd_pfn *nd_pfn)
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{
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struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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void *zero_page = page_address(ZERO_PAGE(0));
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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int num_bad, meta_num, rc, bb_present;
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sector_t first_bad, meta_start;
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struct nd_namespace_io *nsio;
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if (nd_pfn->mode != PFN_MODE_PMEM)
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return 0;
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nsio = to_nd_namespace_io(&ndns->dev);
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meta_start = (SZ_4K + sizeof(*pfn_sb)) >> 9;
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meta_num = (le64_to_cpu(pfn_sb->dataoff) >> 9) - meta_start;
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do {
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unsigned long zero_len;
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u64 nsoff;
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bb_present = badblocks_check(&nd_region->bb, meta_start,
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meta_num, &first_bad, &num_bad);
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if (bb_present) {
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dev_dbg(&nd_pfn->dev, "meta: %x badblocks at %llx\n",
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num_bad, first_bad);
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nsoff = ALIGN_DOWN((nd_region->ndr_start
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+ (first_bad << 9)) - nsio->res.start,
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PAGE_SIZE);
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zero_len = ALIGN(num_bad << 9, PAGE_SIZE);
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while (zero_len) {
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unsigned long chunk = min(zero_len, PAGE_SIZE);
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rc = nvdimm_write_bytes(ndns, nsoff, zero_page,
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chunk, 0);
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if (rc)
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break;
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zero_len -= chunk;
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nsoff += chunk;
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}
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if (rc) {
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dev_err(&nd_pfn->dev,
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"error clearing %x badblocks at %llx\n",
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num_bad, first_bad);
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return rc;
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}
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}
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} while (bb_present);
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return 0;
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}
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int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
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{
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u64 checksum, offset;
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enum nd_pfn_mode mode;
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struct nd_namespace_io *nsio;
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unsigned long align, start_pad;
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
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if (!pfn_sb || !ndns)
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return -ENODEV;
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if (!is_memory(nd_pfn->dev.parent))
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return -ENODEV;
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if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0))
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return -ENXIO;
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if (memcmp(pfn_sb->signature, 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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if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
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return -ENODEV;
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if (__le16_to_cpu(pfn_sb->version_minor) < 1) {
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pfn_sb->start_pad = 0;
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pfn_sb->end_trunc = 0;
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}
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if (__le16_to_cpu(pfn_sb->version_minor) < 2)
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pfn_sb->align = 0;
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switch (le32_to_cpu(pfn_sb->mode)) {
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case PFN_MODE_RAM:
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case PFN_MODE_PMEM:
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break;
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default:
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return -ENXIO;
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}
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align = le32_to_cpu(pfn_sb->align);
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offset = le64_to_cpu(pfn_sb->dataoff);
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start_pad = le32_to_cpu(pfn_sb->start_pad);
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if (align == 0)
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align = 1UL << ilog2(offset);
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mode = le32_to_cpu(pfn_sb->mode);
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if (!nd_pfn->uuid) {
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/*
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* When probing a namepace via nd_pfn_probe() the uuid
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* is NULL (see: nd_pfn_devinit()) we init settings from
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* pfn_sb
|
|
*/
|
|
nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);
|
|
if (!nd_pfn->uuid)
|
|
return -ENOMEM;
|
|
nd_pfn->align = align;
|
|
nd_pfn->mode = mode;
|
|
} else {
|
|
/*
|
|
* When probing a pfn / dax instance we validate the
|
|
* live settings against the pfn_sb
|
|
*/
|
|
if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* If the uuid validates, but other settings mismatch
|
|
* return EINVAL because userspace has managed to change
|
|
* the configuration without specifying new
|
|
* identification.
|
|
*/
|
|
if (nd_pfn->align != align || nd_pfn->mode != mode) {
|
|
dev_err(&nd_pfn->dev,
|
|
"init failed, settings mismatch\n");
|
|
dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",
|
|
nd_pfn->align, align, nd_pfn->mode,
|
|
mode);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (align > nvdimm_namespace_capacity(ndns)) {
|
|
dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
|
|
align, nvdimm_namespace_capacity(ndns));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* These warnings are verbose because they can only trigger in
|
|
* the case where the physical address alignment of the
|
|
* namespace has changed since the pfn superblock was
|
|
* established.
|
|
*/
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
if (offset >= resource_size(&nsio->res)) {
|
|
dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
|
|
dev_name(&ndns->dev));
|
|
return -EBUSY;
|
|
}
|
|
|
|
if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align))
|
|
|| !IS_ALIGNED(offset, PAGE_SIZE)) {
|
|
dev_err(&nd_pfn->dev,
|
|
"bad offset: %#llx dax disabled align: %#lx\n",
|
|
offset, align);
|
|
return -ENXIO;
|
|
}
|
|
|
|
return nd_pfn_clear_memmap_errors(nd_pfn);
|
|
}
|
|
EXPORT_SYMBOL(nd_pfn_validate);
|
|
|
|
int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
|
|
{
|
|
int rc;
|
|
struct nd_pfn *nd_pfn;
|
|
struct device *pfn_dev;
|
|
struct nd_pfn_sb *pfn_sb;
|
|
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
|
|
|
|
if (ndns->force_raw)
|
|
return -ENODEV;
|
|
|
|
switch (ndns->claim_class) {
|
|
case NVDIMM_CCLASS_NONE:
|
|
case NVDIMM_CCLASS_PFN:
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
nvdimm_bus_lock(&ndns->dev);
|
|
nd_pfn = nd_pfn_alloc(nd_region);
|
|
pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
|
|
nvdimm_bus_unlock(&ndns->dev);
|
|
if (!pfn_dev)
|
|
return -ENOMEM;
|
|
pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
|
|
nd_pfn = to_nd_pfn(pfn_dev);
|
|
nd_pfn->pfn_sb = pfn_sb;
|
|
rc = nd_pfn_validate(nd_pfn, PFN_SIG);
|
|
dev_dbg(dev, "pfn: %s\n", rc == 0 ? dev_name(pfn_dev) : "<none>");
|
|
if (rc < 0) {
|
|
nd_detach_ndns(pfn_dev, &nd_pfn->ndns);
|
|
put_device(pfn_dev);
|
|
} else
|
|
__nd_device_register(pfn_dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(nd_pfn_probe);
|
|
|
|
static u32 info_block_reserve(void)
|
|
{
|
|
return ALIGN(SZ_8K, PAGE_SIZE);
|
|
}
|
|
|
|
/*
|
|
* We hotplug memory at section granularity, pad the reserved area from
|
|
* the previous section base to the namespace base address.
|
|
*/
|
|
static unsigned long init_altmap_base(resource_size_t base)
|
|
{
|
|
unsigned long base_pfn = PHYS_PFN(base);
|
|
|
|
return PFN_SECTION_ALIGN_DOWN(base_pfn);
|
|
}
|
|
|
|
static unsigned long init_altmap_reserve(resource_size_t base)
|
|
{
|
|
unsigned long reserve = info_block_reserve() >> PAGE_SHIFT;
|
|
unsigned long base_pfn = PHYS_PFN(base);
|
|
|
|
reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
|
|
return reserve;
|
|
}
|
|
|
|
static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
|
|
{
|
|
struct resource *res = &pgmap->res;
|
|
struct vmem_altmap *altmap = &pgmap->altmap;
|
|
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
|
|
u64 offset = le64_to_cpu(pfn_sb->dataoff);
|
|
u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
|
|
u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
|
|
u32 reserve = info_block_reserve();
|
|
struct nd_namespace_common *ndns = nd_pfn->ndns;
|
|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
resource_size_t base = nsio->res.start + start_pad;
|
|
struct vmem_altmap __altmap = {
|
|
.base_pfn = init_altmap_base(base),
|
|
.reserve = init_altmap_reserve(base),
|
|
};
|
|
|
|
memcpy(res, &nsio->res, sizeof(*res));
|
|
res->start += start_pad;
|
|
res->end -= end_trunc;
|
|
|
|
if (nd_pfn->mode == PFN_MODE_RAM) {
|
|
if (offset < reserve)
|
|
return -EINVAL;
|
|
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
|
|
pgmap->altmap_valid = false;
|
|
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
|
|
nd_pfn->npfns = PFN_SECTION_ALIGN_UP((resource_size(res)
|
|
- offset) / PAGE_SIZE);
|
|
if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
|
|
dev_info(&nd_pfn->dev,
|
|
"number of pfns truncated from %lld to %ld\n",
|
|
le64_to_cpu(nd_pfn->pfn_sb->npfns),
|
|
nd_pfn->npfns);
|
|
memcpy(altmap, &__altmap, sizeof(*altmap));
|
|
altmap->free = PHYS_PFN(offset - reserve);
|
|
altmap->alloc = 0;
|
|
pgmap->altmap_valid = true;
|
|
} else
|
|
return -ENXIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 phys_pmem_align_down(struct nd_pfn *nd_pfn, u64 phys)
|
|
{
|
|
return min_t(u64, PHYS_SECTION_ALIGN_DOWN(phys),
|
|
ALIGN_DOWN(phys, nd_pfn->align));
|
|
}
|
|
|
|
/*
|
|
* Check if pmem collides with 'System RAM', or other regions when
|
|
* section aligned. Trim it accordingly.
|
|
*/
|
|
static void trim_pfn_device(struct nd_pfn *nd_pfn, u32 *start_pad, u32 *end_trunc)
|
|
{
|
|
struct nd_namespace_common *ndns = nd_pfn->ndns;
|
|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
|
|
const resource_size_t start = nsio->res.start;
|
|
const resource_size_t end = start + resource_size(&nsio->res);
|
|
resource_size_t adjust, size;
|
|
|
|
*start_pad = 0;
|
|
*end_trunc = 0;
|
|
|
|
adjust = start - PHYS_SECTION_ALIGN_DOWN(start);
|
|
size = resource_size(&nsio->res) + adjust;
|
|
if (region_intersects(start - adjust, size, IORESOURCE_SYSTEM_RAM,
|
|
IORES_DESC_NONE) == REGION_MIXED
|
|
|| nd_region_conflict(nd_region, start - adjust, size))
|
|
*start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
|
|
|
|
/* Now check that end of the range does not collide. */
|
|
adjust = PHYS_SECTION_ALIGN_UP(end) - end;
|
|
size = resource_size(&nsio->res) + adjust;
|
|
if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
|
|
IORES_DESC_NONE) == REGION_MIXED
|
|
|| !IS_ALIGNED(end, nd_pfn->align)
|
|
|| nd_region_conflict(nd_region, start, size))
|
|
*end_trunc = end - phys_pmem_align_down(nd_pfn, end);
|
|
}
|
|
|
|
static int nd_pfn_init(struct nd_pfn *nd_pfn)
|
|
{
|
|
struct nd_namespace_common *ndns = nd_pfn->ndns;
|
|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
u32 start_pad, end_trunc, reserve = info_block_reserve();
|
|
resource_size_t start, size;
|
|
struct nd_region *nd_region;
|
|
struct nd_pfn_sb *pfn_sb;
|
|
unsigned long npfns;
|
|
phys_addr_t offset;
|
|
const char *sig;
|
|
u64 checksum;
|
|
int rc;
|
|
|
|
pfn_sb = devm_kzalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL);
|
|
if (!pfn_sb)
|
|
return -ENOMEM;
|
|
|
|
nd_pfn->pfn_sb = pfn_sb;
|
|
if (is_nd_dax(&nd_pfn->dev))
|
|
sig = DAX_SIG;
|
|
else
|
|
sig = PFN_SIG;
|
|
rc = nd_pfn_validate(nd_pfn, sig);
|
|
if (rc != -ENODEV)
|
|
return rc;
|
|
|
|
/* no info block, do init */;
|
|
nd_region = to_nd_region(nd_pfn->dev.parent);
|
|
if (nd_region->ro) {
|
|
dev_info(&nd_pfn->dev,
|
|
"%s is read-only, unable to init metadata\n",
|
|
dev_name(&nd_region->dev));
|
|
return -ENXIO;
|
|
}
|
|
|
|
memset(pfn_sb, 0, sizeof(*pfn_sb));
|
|
|
|
trim_pfn_device(nd_pfn, &start_pad, &end_trunc);
|
|
if (start_pad + end_trunc)
|
|
dev_info(&nd_pfn->dev, "%s alignment collision, truncate %d bytes\n",
|
|
dev_name(&ndns->dev), start_pad + end_trunc);
|
|
|
|
/*
|
|
* Note, we use 64 here for the standard size of struct page,
|
|
* debugging options may cause it to be larger in which case the
|
|
* implementation will limit the pfns advertised through
|
|
* ->direct_access() to those that are included in the memmap.
|
|
*/
|
|
start = nsio->res.start + start_pad;
|
|
size = resource_size(&nsio->res);
|
|
npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - reserve)
|
|
/ PAGE_SIZE);
|
|
if (nd_pfn->mode == PFN_MODE_PMEM) {
|
|
/*
|
|
* The altmap should be padded out to the block size used
|
|
* when populating the vmemmap. This *should* be equal to
|
|
* PMD_SIZE for most architectures.
|
|
*/
|
|
offset = ALIGN(start + reserve + 64 * npfns,
|
|
max(nd_pfn->align, PMD_SIZE)) - start;
|
|
} else if (nd_pfn->mode == PFN_MODE_RAM)
|
|
offset = ALIGN(start + reserve, nd_pfn->align) - start;
|
|
else
|
|
return -ENXIO;
|
|
|
|
if (offset + start_pad + end_trunc >= size) {
|
|
dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
|
|
dev_name(&ndns->dev));
|
|
return -ENXIO;
|
|
}
|
|
|
|
npfns = (size - offset - start_pad - end_trunc) / SZ_4K;
|
|
pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
|
|
pfn_sb->dataoff = cpu_to_le64(offset);
|
|
pfn_sb->npfns = cpu_to_le64(npfns);
|
|
memcpy(pfn_sb->signature, sig, PFN_SIG_LEN);
|
|
memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
|
|
memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
|
|
pfn_sb->version_major = cpu_to_le16(1);
|
|
pfn_sb->version_minor = cpu_to_le16(2);
|
|
pfn_sb->start_pad = cpu_to_le32(start_pad);
|
|
pfn_sb->end_trunc = cpu_to_le32(end_trunc);
|
|
pfn_sb->align = cpu_to_le32(nd_pfn->align);
|
|
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
|
|
pfn_sb->checksum = cpu_to_le64(checksum);
|
|
|
|
return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0);
|
|
}
|
|
|
|
/*
|
|
* Determine the effective resource range and vmem_altmap from an nd_pfn
|
|
* instance.
|
|
*/
|
|
int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
|
|
{
|
|
int rc;
|
|
|
|
if (!nd_pfn->uuid || !nd_pfn->ndns)
|
|
return -ENODEV;
|
|
|
|
rc = nd_pfn_init(nd_pfn);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* we need a valid pfn_sb before we can init a dev_pagemap */
|
|
return __nvdimm_setup_pfn(nd_pfn, pgmap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_setup_pfn);
|