#include <linux/libnvdimm.h>
#include <linux/export.h>
#include <linux/module.h>
+#include <linux/blkdev.h>
#include <linux/device.h>
+#include <linux/ctype.h>
+#include <linux/ndctl.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "nd-core.h"
+#include "nd.h"
-static LIST_HEAD(nvdimm_bus_list);
-static DEFINE_MUTEX(nvdimm_bus_list_mutex);
+LIST_HEAD(nvdimm_bus_list);
+DEFINE_MUTEX(nvdimm_bus_list_mutex);
static DEFINE_IDA(nd_ida);
+void nvdimm_bus_lock(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return;
+ mutex_lock(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(nvdimm_bus_lock);
+
+void nvdimm_bus_unlock(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return;
+ mutex_unlock(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(nvdimm_bus_unlock);
+
+bool is_nvdimm_bus_locked(struct device *dev)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+
+ if (!nvdimm_bus)
+ return false;
+ return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
+}
+EXPORT_SYMBOL(is_nvdimm_bus_locked);
+
+u64 nd_fletcher64(void *addr, size_t len, bool le)
+{
+ u32 *buf = addr;
+ u32 lo32 = 0;
+ u64 hi32 = 0;
+ int i;
+
+ for (i = 0; i < len / sizeof(u32); i++) {
+ lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
+ hi32 += lo32;
+ }
+
+ return hi32 << 32 | lo32;
+}
+EXPORT_SYMBOL_GPL(nd_fletcher64);
+
static void nvdimm_bus_release(struct device *dev)
{
struct nvdimm_bus *nvdimm_bus;
}
EXPORT_SYMBOL_GPL(to_nd_desc);
+struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
+{
+ struct device *dev;
+
+ for (dev = nd_dev; dev; dev = dev->parent)
+ if (dev->release == nvdimm_bus_release)
+ break;
+ dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
+ if (dev)
+ return to_nvdimm_bus(dev);
+ return NULL;
+}
+
+static bool is_uuid_sep(char sep)
+{
+ if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
+ return true;
+ return false;
+}
+
+static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
+ size_t len)
+{
+ const char *str = buf;
+ u8 uuid[16];
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ if (!isxdigit(str[0]) || !isxdigit(str[1])) {
+ dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
+ __func__, i, str - buf, str[0],
+ str + 1 - buf, str[1]);
+ return -EINVAL;
+ }
+
+ uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
+ str += 2;
+ if (is_uuid_sep(*str))
+ str++;
+ }
+
+ memcpy(uuid_out, uuid, sizeof(uuid));
+ return 0;
+}
+
+/**
+ * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
+ * @dev: container device for the uuid property
+ * @uuid_out: uuid buffer to replace
+ * @buf: raw sysfs buffer to parse
+ *
+ * Enforce that uuids can only be changed while the device is disabled
+ * (driver detached)
+ * LOCKING: expects device_lock() is held on entry
+ */
+int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
+ size_t len)
+{
+ u8 uuid[16];
+ int rc;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ rc = nd_uuid_parse(dev, uuid, buf, len);
+ if (rc)
+ return rc;
+
+ kfree(*uuid_out);
+ *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
+ if (!(*uuid_out))
+ return -ENOMEM;
+
+ return 0;
+}
+
+ssize_t nd_sector_size_show(unsigned long current_lbasize,
+ const unsigned long *supported, char *buf)
+{
+ ssize_t len = 0;
+ int i;
+
+ for (i = 0; supported[i]; i++)
+ if (current_lbasize == supported[i])
+ len += sprintf(buf + len, "[%ld] ", supported[i]);
+ else
+ len += sprintf(buf + len, "%ld ", supported[i]);
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+
+ssize_t nd_sector_size_store(struct device *dev, const char *buf,
+ unsigned long *current_lbasize, const unsigned long *supported)
+{
+ unsigned long lbasize;
+ int rc, i;
+
+ if (dev->driver)
+ return -EBUSY;
+
+ rc = kstrtoul(buf, 0, &lbasize);
+ if (rc)
+ return rc;
+
+ for (i = 0; supported[i]; i++)
+ if (lbasize == supported[i])
+ break;
+
+ if (supported[i]) {
+ *current_lbasize = lbasize;
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}
+
+void __nd_iostat_start(struct bio *bio, unsigned long *start)
+{
+ struct gendisk *disk = bio->bi_bdev->bd_disk;
+ const int rw = bio_data_dir(bio);
+ int cpu = part_stat_lock();
+
+ *start = jiffies;
+ part_round_stats(cpu, &disk->part0);
+ part_stat_inc(cpu, &disk->part0, ios[rw]);
+ part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
+ part_inc_in_flight(&disk->part0, rw);
+ part_stat_unlock();
+}
+EXPORT_SYMBOL(__nd_iostat_start);
+
+void nd_iostat_end(struct bio *bio, unsigned long start)
+{
+ struct gendisk *disk = bio->bi_bdev->bd_disk;
+ unsigned long duration = jiffies - start;
+ const int rw = bio_data_dir(bio);
+ int cpu = part_stat_lock();
+
+ part_stat_add(cpu, &disk->part0, ticks[rw], duration);
+ part_round_stats(cpu, &disk->part0);
+ part_dec_in_flight(&disk->part0, rw);
+ part_stat_unlock();
+}
+EXPORT_SYMBOL(nd_iostat_end);
+
+static ssize_t commands_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int cmd, len = 0;
+ struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
+ struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
+
+ for_each_set_bit(cmd, &nd_desc->dsm_mask, BITS_PER_LONG)
+ len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+static DEVICE_ATTR_RO(commands);
+
static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
{
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
}
static DEVICE_ATTR_RO(provider);
+static int flush_namespaces(struct device *dev, void *data)
+{
+ device_lock(dev);
+ device_unlock(dev);
+ return 0;
+}
+
+static int flush_regions_dimms(struct device *dev, void *data)
+{
+ device_lock(dev);
+ device_unlock(dev);
+ device_for_each_child(dev, NULL, flush_namespaces);
+ return 0;
+}
+
+static ssize_t wait_probe_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ nd_synchronize();
+ device_for_each_child(dev, NULL, flush_regions_dimms);
+ return sprintf(buf, "1\n");
+}
+static DEVICE_ATTR_RO(wait_probe);
+
static struct attribute *nvdimm_bus_attributes[] = {
+ &dev_attr_commands.attr,
+ &dev_attr_wait_probe.attr,
&dev_attr_provider.attr,
NULL,
};
};
EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
-struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
- struct nvdimm_bus_descriptor *nd_desc)
+struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
+ struct nvdimm_bus_descriptor *nd_desc, struct module *module)
{
struct nvdimm_bus *nvdimm_bus;
int rc;
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
+ init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
+ mutex_init(&nvdimm_bus->reconfig_mutex);
if (nvdimm_bus->id < 0) {
kfree(nvdimm_bus);
return NULL;
}
nvdimm_bus->nd_desc = nd_desc;
+ nvdimm_bus->module = module;
nvdimm_bus->dev.parent = parent;
nvdimm_bus->dev.release = nvdimm_bus_release;
nvdimm_bus->dev.groups = nd_desc->attr_groups;
put_device(&nvdimm_bus->dev);
return NULL;
}
-EXPORT_SYMBOL_GPL(nvdimm_bus_register);
+EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
+
+static int child_unregister(struct device *dev, void *data)
+{
+ /*
+ * the singular ndctl class device per bus needs to be
+ * "device_destroy"ed, so skip it here
+ *
+ * i.e. remove classless children
+ */
+ if (dev->class)
+ /* pass */;
+ else
+ nd_device_unregister(dev, ND_SYNC);
+ return 0;
+}
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
{
list_del_init(&nvdimm_bus->list);
mutex_unlock(&nvdimm_bus_list_mutex);
+ nd_synchronize();
+ device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
device_unregister(&nvdimm_bus->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+static int nd_pi_nop_generate_verify(struct blk_integrity_iter *iter)
+{
+ return 0;
+}
+
+int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
+{
+ struct blk_integrity integrity = {
+ .name = "ND-PI-NOP",
+ .generate_fn = nd_pi_nop_generate_verify,
+ .verify_fn = nd_pi_nop_generate_verify,
+ .tuple_size = meta_size,
+ .tag_size = meta_size,
+ };
+ int ret;
+
+ if (meta_size == 0)
+ return 0;
+
+ ret = blk_integrity_register(disk, &integrity);
+ if (ret)
+ return ret;
+
+ blk_queue_max_integrity_segments(disk->queue, 1);
+
+ return 0;
+}
+EXPORT_SYMBOL(nd_integrity_init);
+
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
+{
+ return 0;
+}
+EXPORT_SYMBOL(nd_integrity_init);
+
+#endif
+
static __init int libnvdimm_init(void)
{
- return nvdimm_bus_init();
+ int rc;
+
+ rc = nvdimm_bus_init();
+ if (rc)
+ return rc;
+ rc = nvdimm_init();
+ if (rc)
+ goto err_dimm;
+ rc = nd_region_init();
+ if (rc)
+ goto err_region;
+ return 0;
+ err_region:
+ nvdimm_exit();
+ err_dimm:
+ nvdimm_bus_exit();
+ return rc;
}
static __exit void libnvdimm_exit(void)
{
WARN_ON(!list_empty(&nvdimm_bus_list));
+ nd_region_exit();
+ nvdimm_exit();
nvdimm_bus_exit();
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff