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libnvdimm, pfn: 'struct page' provider infrastructure
Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
+8
-164
@@ -21,63 +21,13 @@
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#include "btt.h"
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#include "nd.h"
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static void __nd_btt_detach_ndns(struct nd_btt *nd_btt)
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{
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struct nd_namespace_common *ndns = nd_btt->ndns;
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dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex)
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|| ndns->claim != &nd_btt->dev,
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"%s: invalid claim\n", __func__);
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ndns->claim = NULL;
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nd_btt->ndns = NULL;
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put_device(&ndns->dev);
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}
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static void nd_btt_detach_ndns(struct nd_btt *nd_btt)
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{
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struct nd_namespace_common *ndns = nd_btt->ndns;
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if (!ndns)
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return;
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get_device(&ndns->dev);
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device_lock(&ndns->dev);
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__nd_btt_detach_ndns(nd_btt);
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device_unlock(&ndns->dev);
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put_device(&ndns->dev);
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}
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static bool __nd_btt_attach_ndns(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns)
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{
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if (ndns->claim)
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return false;
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dev_WARN_ONCE(&nd_btt->dev, !mutex_is_locked(&ndns->dev.mutex)
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|| nd_btt->ndns,
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"%s: invalid claim\n", __func__);
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ndns->claim = &nd_btt->dev;
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nd_btt->ndns = ndns;
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get_device(&ndns->dev);
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return true;
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}
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static bool nd_btt_attach_ndns(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns)
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{
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bool claimed;
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device_lock(&ndns->dev);
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claimed = __nd_btt_attach_ndns(nd_btt, ndns);
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device_unlock(&ndns->dev);
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return claimed;
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}
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static void nd_btt_release(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_btt *nd_btt = to_nd_btt(dev);
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dev_dbg(dev, "%s\n", __func__);
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nd_btt_detach_ndns(nd_btt);
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nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
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ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
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kfree(nd_btt->uuid);
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kfree(nd_btt);
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@@ -172,104 +122,15 @@ static ssize_t namespace_show(struct device *dev,
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return rc;
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}
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static int namespace_match(struct device *dev, void *data)
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{
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char *name = data;
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return strcmp(name, dev_name(dev)) == 0;
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}
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static bool is_nd_btt_idle(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_btt *nd_btt = to_nd_btt(dev);
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if (nd_region->btt_seed == dev || nd_btt->ndns || dev->driver)
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return false;
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return true;
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}
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static ssize_t __namespace_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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struct nd_namespace_common *ndns;
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struct device *found;
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char *name;
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if (dev->driver) {
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dev_dbg(dev, "%s: -EBUSY\n", __func__);
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return -EBUSY;
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}
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name = kstrndup(buf, len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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strim(name);
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if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
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/* pass */;
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else {
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len = -EINVAL;
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goto out;
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}
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ndns = nd_btt->ndns;
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if (strcmp(name, "") == 0) {
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/* detach the namespace and destroy / reset the btt device */
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nd_btt_detach_ndns(nd_btt);
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if (is_nd_btt_idle(dev))
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nd_device_unregister(dev, ND_ASYNC);
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else {
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nd_btt->lbasize = 0;
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kfree(nd_btt->uuid);
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nd_btt->uuid = NULL;
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}
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goto out;
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} else if (ndns) {
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dev_dbg(dev, "namespace already set to: %s\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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goto out;
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}
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found = device_find_child(dev->parent, name, namespace_match);
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if (!found) {
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dev_dbg(dev, "'%s' not found under %s\n", name,
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dev_name(dev->parent));
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len = -ENODEV;
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goto out;
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}
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ndns = to_ndns(found);
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if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
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dev_dbg(dev, "%s too small to host btt\n", name);
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len = -ENXIO;
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goto out_attach;
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}
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WARN_ON_ONCE(!is_nvdimm_bus_locked(&nd_btt->dev));
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if (!nd_btt_attach_ndns(nd_btt, ndns)) {
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dev_dbg(dev, "%s already claimed\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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}
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out_attach:
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put_device(&ndns->dev); /* from device_find_child */
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out:
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kfree(name);
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return len;
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}
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static ssize_t namespace_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct nd_btt *nd_btt = to_nd_btt(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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device_lock(dev);
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rc = __namespace_store(dev, attr, buf, len);
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rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
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dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
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rc, buf, buf[len - 1] == '\n' ? "" : "\n");
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device_unlock(dev);
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@@ -324,7 +185,7 @@ static struct device *__nd_btt_create(struct nd_region *nd_region,
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dev->type = &nd_btt_device_type;
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dev->groups = nd_btt_attribute_groups;
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device_initialize(&nd_btt->dev);
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if (ndns && !__nd_btt_attach_ndns(nd_btt, ndns)) {
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if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
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dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
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__func__, dev_name(ndns->claim));
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put_device(dev);
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@@ -375,7 +236,7 @@ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
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checksum = le64_to_cpu(super->checksum);
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super->checksum = 0;
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if (checksum != nd_btt_sb_checksum(super))
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if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
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return false;
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super->checksum = cpu_to_le64(checksum);
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@@ -387,25 +248,6 @@ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
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}
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EXPORT_SYMBOL(nd_btt_arena_is_valid);
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/*
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* nd_btt_sb_checksum: compute checksum for btt info block
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*
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* Returns a fletcher64 checksum of everything in the given info block
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* except the last field (since that's where the checksum lives).
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*/
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u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
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{
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u64 sum;
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__le64 sum_save;
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sum_save = btt_sb->checksum;
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btt_sb->checksum = 0;
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sum = nd_fletcher64(btt_sb, sizeof(*btt_sb), 1);
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btt_sb->checksum = sum_save;
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return sum;
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}
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EXPORT_SYMBOL(nd_btt_sb_checksum);
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static int __nd_btt_probe(struct nd_btt *nd_btt,
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struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
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{
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@@ -453,7 +295,9 @@ int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
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dev_dbg(&ndns->dev, "%s: btt: %s\n", __func__,
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rc == 0 ? dev_name(dev) : "<none>");
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if (rc < 0) {
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__nd_btt_detach_ndns(to_nd_btt(dev));
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struct nd_btt *nd_btt = to_nd_btt(dev);
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__nd_detach_ndns(dev, &nd_btt->ndns);
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put_device(dev);
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}
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