864 lines
22 KiB
C
864 lines
22 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
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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/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 const bool page_struct_override = IS_ENABLED(CONFIG_NVDIMM_KMSAN);
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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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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 unsigned long *nd_pfn_supported_alignments(unsigned long *alignments)
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{
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alignments[0] = PAGE_SIZE;
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if (has_transparent_hugepage()) {
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alignments[1] = HPAGE_PMD_SIZE;
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if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
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alignments[2] = HPAGE_PUD_SIZE;
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}
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return alignments;
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}
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/*
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* Use pmd mapping if supported as default alignment
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*/
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static unsigned long nd_pfn_default_alignment(void)
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{
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if (has_transparent_hugepage())
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return HPAGE_PMD_SIZE;
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return PAGE_SIZE;
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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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unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, };
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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(aligns));
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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_ADMIN_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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unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, };
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return nd_size_select_show(0,
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nd_pfn_supported_alignments(aligns), 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 struct attribute_group nd_pfn_attribute_group = {
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.attrs = nd_pfn_attributes,
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};
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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 const 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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.groups = nd_pfn_attribute_groups,
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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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static struct lock_class_key nvdimm_pfn_key;
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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 = nd_pfn_default_alignment();
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dev = &nd_pfn->dev;
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device_initialize(&nd_pfn->dev);
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lockdep_set_class(&nd_pfn->dev.mutex, &nvdimm_pfn_key);
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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->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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/*
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* re-enable the namespace with correct size so that we can access
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* the device memmap area.
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*/
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devm_namespace_disable(&nd_pfn->dev, ndns);
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rc = devm_namespace_enable(&nd_pfn->dev, ndns, le64_to_cpu(pfn_sb->dataoff));
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if (rc)
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return rc;
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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",
|
||
|
num_bad, first_bad);
|
||
|
return rc;
|
||
|
}
|
||
|
}
|
||
|
} while (bb_present);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static bool nd_supported_alignment(unsigned long align)
|
||
|
{
|
||
|
int i;
|
||
|
unsigned long supported[MAX_NVDIMM_ALIGN] = { [0] = 0, };
|
||
|
|
||
|
if (align == 0)
|
||
|
return false;
|
||
|
|
||
|
nd_pfn_supported_alignments(supported);
|
||
|
for (i = 0; supported[i]; i++)
|
||
|
if (align == supported[i])
|
||
|
return true;
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* nd_pfn_validate - read and validate info-block
|
||
|
* @nd_pfn: fsdax namespace runtime state / properties
|
||
|
* @sig: 'devdax' or 'fsdax' signature
|
||
|
*
|
||
|
* Upon return the info-block buffer contents (->pfn_sb) are
|
||
|
* indeterminate when validation fails, and a coherent info-block
|
||
|
* otherwise.
|
||
|
*/
|
||
|
int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
|
||
|
{
|
||
|
u64 checksum, offset;
|
||
|
struct resource *res;
|
||
|
enum nd_pfn_mode mode;
|
||
|
struct nd_namespace_io *nsio;
|
||
|
unsigned long align, start_pad;
|
||
|
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
|
||
|
struct nd_namespace_common *ndns = nd_pfn->ndns;
|
||
|
const uuid_t *parent_uuid = nd_dev_to_uuid(&ndns->dev);
|
||
|
|
||
|
if (!pfn_sb || !ndns)
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (!is_memory(nd_pfn->dev.parent))
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0))
|
||
|
return -ENXIO;
|
||
|
|
||
|
if (memcmp(pfn_sb->signature, sig, PFN_SIG_LEN) != 0)
|
||
|
return -ENODEV;
|
||
|
|
||
|
checksum = le64_to_cpu(pfn_sb->checksum);
|
||
|
pfn_sb->checksum = 0;
|
||
|
if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb))
|
||
|
return -ENODEV;
|
||
|
pfn_sb->checksum = cpu_to_le64(checksum);
|
||
|
|
||
|
if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (__le16_to_cpu(pfn_sb->version_minor) < 1) {
|
||
|
pfn_sb->start_pad = 0;
|
||
|
pfn_sb->end_trunc = 0;
|
||
|
}
|
||
|
|
||
|
if (__le16_to_cpu(pfn_sb->version_minor) < 2)
|
||
|
pfn_sb->align = 0;
|
||
|
|
||
|
if (__le16_to_cpu(pfn_sb->version_minor) < 4) {
|
||
|
pfn_sb->page_struct_size = cpu_to_le16(64);
|
||
|
pfn_sb->page_size = cpu_to_le32(PAGE_SIZE);
|
||
|
}
|
||
|
|
||
|
switch (le32_to_cpu(pfn_sb->mode)) {
|
||
|
case PFN_MODE_RAM:
|
||
|
case PFN_MODE_PMEM:
|
||
|
break;
|
||
|
default:
|
||
|
return -ENXIO;
|
||
|
}
|
||
|
|
||
|
align = le32_to_cpu(pfn_sb->align);
|
||
|
offset = le64_to_cpu(pfn_sb->dataoff);
|
||
|
start_pad = le32_to_cpu(pfn_sb->start_pad);
|
||
|
if (align == 0)
|
||
|
align = 1UL << ilog2(offset);
|
||
|
mode = le32_to_cpu(pfn_sb->mode);
|
||
|
|
||
|
if ((le32_to_cpu(pfn_sb->page_size) > PAGE_SIZE) &&
|
||
|
(mode == PFN_MODE_PMEM)) {
|
||
|
dev_err(&nd_pfn->dev,
|
||
|
"init failed, page size mismatch %d\n",
|
||
|
le32_to_cpu(pfn_sb->page_size));
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
if ((le16_to_cpu(pfn_sb->page_struct_size) < sizeof(struct page)) &&
|
||
|
(mode == PFN_MODE_PMEM)) {
|
||
|
dev_err(&nd_pfn->dev,
|
||
|
"init failed, struct page size mismatch %d\n",
|
||
|
le16_to_cpu(pfn_sb->page_struct_size));
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Check whether the we support the alignment. For Dax if the
|
||
|
* superblock alignment is not matching, we won't initialize
|
||
|
* the device.
|
||
|
*/
|
||
|
if (!nd_supported_alignment(align) &&
|
||
|
!memcmp(pfn_sb->signature, DAX_SIG, PFN_SIG_LEN)) {
|
||
|
dev_err(&nd_pfn->dev, "init failed, alignment mismatch: "
|
||
|
"%ld:%ld\n", nd_pfn->align, align);
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
if (!nd_pfn->uuid) {
|
||
|
/*
|
||
|
* When probing a namepace via nd_pfn_probe() the uuid
|
||
|
* is NULL (see: nd_pfn_devinit()) we init settings from
|
||
|
* 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 -EOPNOTSUPP;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (align > nvdimm_namespace_capacity(ndns)) {
|
||
|
dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
|
||
|
align, nvdimm_namespace_capacity(ndns));
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
res = &nsio->res;
|
||
|
if (offset >= resource_size(res)) {
|
||
|
dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
|
||
|
dev_name(&ndns->dev));
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
if ((align && !IS_ALIGNED(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 -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
if (!IS_ALIGNED(res->start + le32_to_cpu(pfn_sb->start_pad),
|
||
|
memremap_compat_align())) {
|
||
|
dev_err(&nd_pfn->dev, "resource start misaligned\n");
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
if (!IS_ALIGNED(res->end + 1 - le32_to_cpu(pfn_sb->end_trunc),
|
||
|
memremap_compat_align())) {
|
||
|
dev_err(&nd_pfn->dev, "resource end misaligned\n");
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
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_kmalloc(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);
|
||
|
|
||
|
/*
|
||
|
* We hotplug memory at sub-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 SUBSECTION_ALIGN_DOWN(base_pfn);
|
||
|
}
|
||
|
|
||
|
static unsigned long init_altmap_reserve(resource_size_t base)
|
||
|
{
|
||
|
unsigned long reserve = nd_info_block_reserve() >> PAGE_SHIFT;
|
||
|
unsigned long base_pfn = PHYS_PFN(base);
|
||
|
|
||
|
reserve += base_pfn - SUBSECTION_ALIGN_DOWN(base_pfn);
|
||
|
return reserve;
|
||
|
}
|
||
|
|
||
|
static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
|
||
|
{
|
||
|
struct range *range = &pgmap->range;
|
||
|
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 = nd_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;
|
||
|
resource_size_t end = nsio->res.end - end_trunc;
|
||
|
struct vmem_altmap __altmap = {
|
||
|
.base_pfn = init_altmap_base(base),
|
||
|
.reserve = init_altmap_reserve(base),
|
||
|
.end_pfn = PHYS_PFN(end),
|
||
|
};
|
||
|
|
||
|
*range = (struct range) {
|
||
|
.start = nsio->res.start + start_pad,
|
||
|
.end = nsio->res.end - end_trunc,
|
||
|
};
|
||
|
pgmap->nr_range = 1;
|
||
|
if (nd_pfn->mode == PFN_MODE_RAM) {
|
||
|
if (offset < reserve)
|
||
|
return -EINVAL;
|
||
|
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
|
||
|
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
|
||
|
nd_pfn->npfns = PHYS_PFN((range_len(range) - offset));
|
||
|
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->flags |= PGMAP_ALTMAP_VALID;
|
||
|
} else
|
||
|
return -ENXIO;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
resource_size_t start, size;
|
||
|
struct nd_region *nd_region;
|
||
|
unsigned long npfns, align;
|
||
|
u32 end_trunc;
|
||
|
struct nd_pfn_sb *pfn_sb;
|
||
|
phys_addr_t offset;
|
||
|
const char *sig;
|
||
|
u64 checksum;
|
||
|
int rc;
|
||
|
|
||
|
pfn_sb = devm_kmalloc(&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 == 0)
|
||
|
return nd_pfn_clear_memmap_errors(nd_pfn);
|
||
|
if (rc != -ENODEV)
|
||
|
return rc;
|
||
|
|
||
|
/* no info block, do init */;
|
||
|
memset(pfn_sb, 0, sizeof(*pfn_sb));
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
start = nsio->res.start;
|
||
|
size = resource_size(&nsio->res);
|
||
|
npfns = PHYS_PFN(size - SZ_8K);
|
||
|
align = max(nd_pfn->align, memremap_compat_align());
|
||
|
|
||
|
/*
|
||
|
* When @start is misaligned fail namespace creation. See
|
||
|
* the 'struct nd_pfn_sb' commentary on why ->start_pad is not
|
||
|
* an option.
|
||
|
*/
|
||
|
if (!IS_ALIGNED(start, memremap_compat_align())) {
|
||
|
dev_err(&nd_pfn->dev, "%s: start %pa misaligned to %#lx\n",
|
||
|
dev_name(&ndns->dev), &start,
|
||
|
memremap_compat_align());
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
end_trunc = start + size - ALIGN_DOWN(start + size, align);
|
||
|
if (nd_pfn->mode == PFN_MODE_PMEM) {
|
||
|
unsigned long page_map_size = MAX_STRUCT_PAGE_SIZE * npfns;
|
||
|
|
||
|
/*
|
||
|
* 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.
|
||
|
*
|
||
|
* Also make sure size of struct page is less than
|
||
|
* MAX_STRUCT_PAGE_SIZE. The goal here is compatibility in the
|
||
|
* face of production kernel configurations that reduce the
|
||
|
* 'struct page' size below MAX_STRUCT_PAGE_SIZE. For debug
|
||
|
* kernel configurations that increase the 'struct page' size
|
||
|
* above MAX_STRUCT_PAGE_SIZE, the page_struct_override allows
|
||
|
* for continuing with the capacity that will be wasted when
|
||
|
* reverting to a production kernel configuration. Otherwise,
|
||
|
* those configurations are blocked by default.
|
||
|
*/
|
||
|
if (sizeof(struct page) > MAX_STRUCT_PAGE_SIZE) {
|
||
|
if (page_struct_override)
|
||
|
page_map_size = sizeof(struct page) * npfns;
|
||
|
else {
|
||
|
dev_err(&nd_pfn->dev,
|
||
|
"Memory debug options prevent using pmem for the page map\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
}
|
||
|
offset = ALIGN(start + SZ_8K + page_map_size, align) - start;
|
||
|
} else if (nd_pfn->mode == PFN_MODE_RAM)
|
||
|
offset = ALIGN(start + SZ_8K, align) - start;
|
||
|
else
|
||
|
return -ENXIO;
|
||
|
|
||
|
if (offset >= size) {
|
||
|
dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
|
||
|
dev_name(&ndns->dev));
|
||
|
return -ENXIO;
|
||
|
}
|
||
|
|
||
|
npfns = PHYS_PFN(size - offset - end_trunc);
|
||
|
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(4);
|
||
|
pfn_sb->end_trunc = cpu_to_le32(end_trunc);
|
||
|
pfn_sb->align = cpu_to_le32(nd_pfn->align);
|
||
|
if (sizeof(struct page) > MAX_STRUCT_PAGE_SIZE && page_struct_override)
|
||
|
pfn_sb->page_struct_size = cpu_to_le16(sizeof(struct page));
|
||
|
else
|
||
|
pfn_sb->page_struct_size = cpu_to_le16(MAX_STRUCT_PAGE_SIZE);
|
||
|
pfn_sb->page_size = cpu_to_le32(PAGE_SIZE);
|
||
|
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
|
||
|
pfn_sb->checksum = cpu_to_le64(checksum);
|
||
|
|
||
|
rc = nd_pfn_clear_memmap_errors(nd_pfn);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
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);
|