[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/nvdimm/pfn_devs.c b/src/kernel/linux/v4.14/drivers/nvdimm/pfn_devs.c
new file mode 100644
index 0000000..e2af91a
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvdimm/pfn_devs.c
@@ -0,0 +1,748 @@
+/*
+ * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/memremap.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/genhd.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include "nd-core.h"
+#include "pfn.h"
+#include "nd.h"
+
+static void nd_pfn_release(struct device *dev)
+{
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+ nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
+ ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
+ kfree(nd_pfn->uuid);
+ kfree(nd_pfn);
+}
+
+static struct device_type nd_pfn_device_type = {
+ .name = "nd_pfn",
+ .release = nd_pfn_release,
+};
+
+bool is_nd_pfn(struct device *dev)
+{
+ return dev ? dev->type == &nd_pfn_device_type : false;
+}
+EXPORT_SYMBOL(is_nd_pfn);
+
+struct nd_pfn *to_nd_pfn(struct device *dev)
+{
+ struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev);
+
+ WARN_ON(!is_nd_pfn(dev));
+ return nd_pfn;
+}
+EXPORT_SYMBOL(to_nd_pfn);
+
+static ssize_t mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+
+ switch (nd_pfn->mode) {
+ case PFN_MODE_RAM:
+ return sprintf(buf, "ram\n");
+ case PFN_MODE_PMEM:
+ return sprintf(buf, "pmem\n");
+ default:
+ return sprintf(buf, "none\n");
+ }
+}
+
+static ssize_t mode_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc = 0;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ if (dev->driver)
+ rc = -EBUSY;
+ else {
+ size_t n = len - 1;
+
+ if (strncmp(buf, "pmem\n", n) == 0
+ || strncmp(buf, "pmem", n) == 0) {
+ nd_pfn->mode = PFN_MODE_PMEM;
+ } else if (strncmp(buf, "ram\n", n) == 0
+ || strncmp(buf, "ram", n) == 0)
+ nd_pfn->mode = PFN_MODE_RAM;
+ else if (strncmp(buf, "none\n", n) == 0
+ || strncmp(buf, "none", n) == 0)
+ nd_pfn->mode = PFN_MODE_NONE;
+ else
+ rc = -EINVAL;
+ }
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(mode);
+
+static ssize_t align_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+
+ return sprintf(buf, "%ld\n", nd_pfn->align);
+}
+
+static const unsigned long *nd_pfn_supported_alignments(void)
+{
+ /*
+ * This needs to be a non-static variable because the *_SIZE
+ * macros aren't always constants.
+ */
+ const unsigned long supported_alignments[] = {
+ PAGE_SIZE,
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ HPAGE_PMD_SIZE,
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
+ HPAGE_PUD_SIZE,
+#endif
+#endif
+ 0,
+ };
+ static unsigned long data[ARRAY_SIZE(supported_alignments)];
+
+ memcpy(data, supported_alignments, sizeof(data));
+
+ return data;
+}
+
+static ssize_t align_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ rc = nd_size_select_store(dev, buf, &nd_pfn->align,
+ nd_pfn_supported_alignments());
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(align);
+
+static ssize_t uuid_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+
+ if (nd_pfn->uuid)
+ return sprintf(buf, "%pUb\n", nd_pfn->uuid);
+ return sprintf(buf, "\n");
+}
+
+static ssize_t uuid_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ device_unlock(dev);
+
+ return rc ? rc : len;
+}
+static DEVICE_ATTR_RW(uuid);
+
+static ssize_t namespace_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ nvdimm_bus_lock(dev);
+ rc = sprintf(buf, "%s\n", nd_pfn->ndns
+ ? dev_name(&nd_pfn->ndns->dev) : "");
+ nvdimm_bus_unlock(dev);
+ return rc;
+}
+
+static ssize_t namespace_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ nvdimm_bus_lock(dev);
+ rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
+ dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
+ rc, buf, buf[len - 1] == '\n' ? "" : "\n");
+ nvdimm_bus_unlock(dev);
+ device_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RW(namespace);
+
+static ssize_t resource_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ if (dev->driver) {
+ struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+ u64 offset = __le64_to_cpu(pfn_sb->dataoff);
+ struct nd_namespace_common *ndns = nd_pfn->ndns;
+ u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
+ struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
+
+ rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start
+ + start_pad + offset);
+ } else {
+ /* no address to convey if the pfn instance is disabled */
+ rc = -ENXIO;
+ }
+ device_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(resource);
+
+static ssize_t size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
+ ssize_t rc;
+
+ device_lock(dev);
+ if (dev->driver) {
+ struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+ u64 offset = __le64_to_cpu(pfn_sb->dataoff);
+ struct nd_namespace_common *ndns = nd_pfn->ndns;
+ u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
+ u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
+ struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
+
+ rc = sprintf(buf, "%llu\n", (unsigned long long)
+ resource_size(&nsio->res) - start_pad
+ - end_trunc - offset);
+ } else {
+ /* no size to convey if the pfn instance is disabled */
+ rc = -ENXIO;
+ }
+ device_unlock(dev);
+
+ return rc;
+}
+static DEVICE_ATTR_RO(size);
+
+static ssize_t supported_alignments_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return nd_size_select_show(0, nd_pfn_supported_alignments(), buf);
+}
+static DEVICE_ATTR_RO(supported_alignments);
+
+static struct attribute *nd_pfn_attributes[] = {
+ &dev_attr_mode.attr,
+ &dev_attr_namespace.attr,
+ &dev_attr_uuid.attr,
+ &dev_attr_align.attr,
+ &dev_attr_resource.attr,
+ &dev_attr_size.attr,
+ &dev_attr_supported_alignments.attr,
+ NULL,
+};
+
+static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ if (a == &dev_attr_resource.attr)
+ return 0400;
+ return a->mode;
+}
+
+struct attribute_group nd_pfn_attribute_group = {
+ .attrs = nd_pfn_attributes,
+ .is_visible = pfn_visible,
+};
+
+static const struct attribute_group *nd_pfn_attribute_groups[] = {
+ &nd_pfn_attribute_group,
+ &nd_device_attribute_group,
+ &nd_numa_attribute_group,
+ NULL,
+};
+
+struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
+ struct nd_namespace_common *ndns)
+{
+ struct device *dev = &nd_pfn->dev;
+
+ if (!nd_pfn)
+ return NULL;
+
+ nd_pfn->mode = PFN_MODE_NONE;
+ nd_pfn->align = PFN_DEFAULT_ALIGNMENT;
+ dev = &nd_pfn->dev;
+ device_initialize(&nd_pfn->dev);
+ if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
+ dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
+ __func__, dev_name(ndns->claim));
+ put_device(dev);
+ return NULL;
+ }
+ return dev;
+}
+
+static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region)
+{
+ struct nd_pfn *nd_pfn;
+ struct device *dev;
+
+ nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
+ if (!nd_pfn)
+ return NULL;
+
+ nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
+ if (nd_pfn->id < 0) {
+ kfree(nd_pfn);
+ return NULL;
+ }
+
+ dev = &nd_pfn->dev;
+ dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
+ dev->groups = nd_pfn_attribute_groups;
+ dev->type = &nd_pfn_device_type;
+ dev->parent = &nd_region->dev;
+
+ return nd_pfn;
+}
+
+struct device *nd_pfn_create(struct nd_region *nd_region)
+{
+ struct nd_pfn *nd_pfn;
+ struct device *dev;
+
+ if (!is_memory(&nd_region->dev))
+ return NULL;
+
+ nd_pfn = nd_pfn_alloc(nd_region);
+ dev = nd_pfn_devinit(nd_pfn, NULL);
+
+ __nd_device_register(dev);
+ return dev;
+}
+
+/**
+ * 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;
+ 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 u8 *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;
+
+ 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 (!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 -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 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, "%s: pfn: %s\n", __func__,
+ 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 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 = PFN_UP(SZ_8K);
+ unsigned long base_pfn = PHYS_PFN(base);
+
+ reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
+ return reserve;
+}
+
+static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
+ struct resource *res, struct vmem_altmap *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);
+ 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 < SZ_8K)
+ return ERR_PTR(-EINVAL);
+ nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
+ altmap = NULL;
+ } 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 - SZ_8K);
+ altmap->alloc = 0;
+ } else
+ return ERR_PTR(-ENXIO);
+
+ return altmap;
+}
+
+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)
+{
+ u32 dax_label_reserve = is_nd_dax(&nd_pfn->dev) ? SZ_128K : 0;
+ 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;
+ u32 start_pad, end_trunc;
+ struct nd_pfn_sb *pfn_sb;
+ unsigned long npfns;
+ 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 != -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;
+ }
+
+ 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 - SZ_8K)
+ / 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 + SZ_8K + 64 * npfns + dax_label_reserve,
+ max(nd_pfn->align, PMD_SIZE)) - start;
+ } else if (nd_pfn->mode == PFN_MODE_RAM)
+ offset = ALIGN(start + SZ_8K + dax_label_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(3);
+ 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.
+ */
+struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
+ struct resource *res, struct vmem_altmap *altmap)
+{
+ int rc;
+
+ if (!nd_pfn->uuid || !nd_pfn->ndns)
+ return ERR_PTR(-ENODEV);
+
+ rc = nd_pfn_init(nd_pfn);
+ if (rc)
+ return ERR_PTR(rc);
+
+ /* we need a valid pfn_sb before we can init a vmem_altmap */
+ return __nvdimm_setup_pfn(nd_pfn, res, altmap);
+}
+EXPORT_SYMBOL_GPL(nvdimm_setup_pfn);