/*
- * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ * 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
* 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>
}
EXPORT_SYMBOL(to_nd_pfn);
+static struct nd_pfn *to_nd_pfn_safe(struct device *dev)
+{
+ /*
+ * pfn device attributes are re-used by dax device instances, so we
+ * need to be careful to correct device-to-nd_pfn conversion.
+ */
+ if (is_nd_pfn(dev))
+ return to_nd_pfn(dev);
+
+ if (is_nd_dax(dev)) {
+ struct nd_dax *nd_dax = to_nd_dax(dev);
+
+ return &nd_dax->nd_pfn;
+ }
+
+ WARN_ON(1);
+ return NULL;
+}
+
static ssize_t mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
switch (nd_pfn->mode) {
case PFN_MODE_RAM:
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(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc = 0;
device_lock(dev);
static ssize_t align_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
return sprintf(buf, "%lx\n", nd_pfn->align);
}
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(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
static ssize_t uuid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
if (nd_pfn->uuid)
return sprintf(buf, "%pUb\n", nd_pfn->uuid);
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(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
static ssize_t namespace_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
nvdimm_bus_lock(dev);
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(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
static ssize_t resource_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct nd_pfn *nd_pfn = to_nd_pfn(dev);
+ struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
ssize_t rc;
device_lock(dev);
NULL,
};
-static struct attribute_group nd_pfn_attribute_group = {
+struct attribute_group nd_pfn_attribute_group = {
.attrs = nd_pfn_attributes,
};
NULL,
};
-static struct device *__nd_pfn_create(struct nd_region *nd_region,
+struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
struct nd_namespace_common *ndns)
{
- struct nd_pfn *nd_pfn;
- struct device *dev;
+ struct device *dev = &nd_pfn->dev;
- /* we can only create pages for contiguous ranged of pmem */
- if (!is_nd_pmem(&nd_region->dev))
+ if (!nd_pfn)
return NULL;
+ nd_pfn->mode = PFN_MODE_NONE;
+ nd_pfn->align = HPAGE_SIZE;
+ 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;
return NULL;
}
- nd_pfn->mode = PFN_MODE_NONE;
- nd_pfn->align = HPAGE_SIZE;
dev = &nd_pfn->dev;
dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
- dev->parent = &nd_region->dev;
- dev->type = &nd_pfn_device_type;
dev->groups = nd_pfn_attribute_groups;
- 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;
+ 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 device *dev = __nd_pfn_create(nd_region, NULL);
+ struct nd_pfn *nd_pfn;
+ struct device *dev;
+
+ if (!is_nd_pmem(&nd_region->dev))
+ return NULL;
- if (dev)
- __nd_device_register(dev);
+ nd_pfn = nd_pfn_alloc(nd_region);
+ dev = nd_pfn_devinit(nd_pfn, NULL);
+
+ __nd_device_register(dev);
return dev;
}
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:
return -EBUSY;
}
- nd_pfn->align = 1UL << ilog2(offset);
+ nd_pfn->align = le32_to_cpu(pfn_sb->align);
if (!is_power_of_2(offset) || offset < PAGE_SIZE) {
dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n",
offset);
}
EXPORT_SYMBOL(nd_pfn_validate);
-int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
+int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
{
int rc;
- struct device *dev;
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);
return -ENODEV;
nvdimm_bus_lock(&ndns->dev);
- dev = __nd_pfn_create(nd_region, ndns);
+ nd_pfn = nd_pfn_alloc(nd_region);
+ pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
- if (!dev)
+ if (!pfn_dev)
return -ENOMEM;
- dev_set_drvdata(dev, drvdata);
- pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
- nd_pfn = to_nd_pfn(dev);
+ 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);
- nd_pfn->pfn_sb = NULL;
- kfree(pfn_sb);
- dev_dbg(&ndns->dev, "%s: pfn: %s\n", __func__,
- rc == 0 ? dev_name(dev) : "<none>");
+ dev_dbg(dev, "%s: pfn: %s\n", __func__,
+ rc == 0 ? dev_name(pfn_dev) : "<none>");
if (rc < 0) {
- __nd_detach_ndns(dev, &nd_pfn->ndns);
- put_device(dev);
+ __nd_detach_ndns(pfn_dev, &nd_pfn->ndns);
+ put_device(pfn_dev);
} else
- __nd_device_register(&nd_pfn->dev);
+ __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 = PHYS_PFN(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;
+
+ nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
+ 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 = (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 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;
+ u32 start_pad = 0, end_trunc = 0;
+ resource_size_t start, size;
+ struct nd_namespace_io *nsio;
+ struct nd_region *nd_region;
+ struct nd_pfn_sb *pfn_sb;
+ unsigned long npfns;
+ phys_addr_t offset;
+ 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;
+ rc = nd_pfn_validate(nd_pfn);
+ 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));
+
+ /*
+ * Check if pmem collides with 'System RAM' when section aligned and
+ * trim it accordingly
+ */
+ nsio = to_nd_namespace_io(&ndns->dev);
+ start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start);
+ size = resource_size(&nsio->res);
+ if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
+ IORES_DESC_NONE) == REGION_MIXED) {
+ start = nsio->res.start;
+ start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
+ }
+
+ start = nsio->res.start;
+ size = PHYS_SECTION_ALIGN_UP(start + size) - start;
+ if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
+ IORES_DESC_NONE) == REGION_MIXED) {
+ size = resource_size(&nsio->res);
+ end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size);
+ }
+
+ if (start_pad + end_trunc)
+ dev_info(&nd_pfn->dev, "%s section 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 += start_pad;
+ size = resource_size(&nsio->res);
+ npfns = (size - start_pad - end_trunc - SZ_8K) / SZ_4K;
+ if (nd_pfn->mode == PFN_MODE_PMEM) {
+ unsigned long memmap_size;
+
+ /*
+ * vmemmap_populate_hugepages() allocates the memmap array in
+ * HPAGE_SIZE chunks.
+ */
+ memmap_size = ALIGN(64 * npfns, HPAGE_SIZE);
+ offset = ALIGN(start + SZ_8K + memmap_size + dax_label_reserve,
+ nd_pfn->align) - 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, PFN_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));
+}
+
+/*
+ * 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);
projects / cascardo / linux.git / blobdiff