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);
}
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);
}
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nd_cmd_get_config_data_hdr *cmd;
struct nvdimm_bus_descriptor *nd_desc;
int rc = validate_dimm(ndd);
u32 max_cmd_size, config_size;
size_t offset;
if (rc)
return rc;
if (ndd->data)
return 0;
if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
|| ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
ndd->nsarea.max_xfer, ndd->nsarea.config_size);
return -ENXIO;
}
ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
if (!ndd->data)
ndd->data = vmalloc(ndd->nsarea.config_size);
if (!ndd->data)
return -ENOMEM;
max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer);
cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
nd_desc = nvdimm_bus->nd_desc;
for (config_size = ndd->nsarea.config_size, offset = 0;
config_size; config_size -= cmd->in_length,
offset += cmd->in_length) {
cmd->in_length = min(config_size, max_cmd_size);
cmd->in_offset = offset;
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_DATA, cmd,
cmd->in_length + sizeof(*cmd), NULL);
if (rc || cmd->status) {
rc = -ENXIO;
break;
}
memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length);
}
dev_dbg(ndd->dev, "%s: len: %zu rc: %d\n", __func__, offset, rc);
kfree(cmd);
return rc;
}
/**
* nd_is_uuid_unique - verify that no other namespace has @uuid
* @dev: any device on a nvdimm_bus
* @uuid: uuid to check
*/
bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!nvdimm_bus)
return false;
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
if (device_for_each_child(&nvdimm_bus->dev, uuid,
is_namespace_uuid_busy) != 0)
return false;
return true;
}
int nd_blk_region_init(struct nd_region *nd_region)
{
struct device *dev = &nd_region->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!is_nd_blk(dev))
return 0;
if (nd_region->ndr_mappings < 1) {
dev_err(dev, "invalid BLK region\n");
return -ENXIO;
}
return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
}
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
void *buf, size_t len)
{
int rc = validate_dimm(ndd);
size_t max_cmd_size, buf_offset;
struct nd_cmd_set_config_hdr *cmd;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
if (rc)
return rc;
if (!ndd->data)
return -ENXIO;
if (offset + len > ndd->nsarea.config_size)
return -ENXIO;
max_cmd_size = min_t(u32, PAGE_SIZE, len);
max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer);
cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
for (buf_offset = 0; len; len -= cmd->in_length,
buf_offset += cmd->in_length) {
size_t cmd_size;
u32 *status;
cmd->in_offset = offset + buf_offset;
cmd->in_length = min(max_cmd_size, len);
memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
/* status is output in the last 4-bytes of the command buffer */
cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
status = ((void *) cmd) + cmd_size - sizeof(u32);
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, NULL);
if (rc || *status) {
rc = rc ? rc : -ENXIO;
break;
}
}
kfree(cmd);
return rc;
}
/**
* nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
* @nvdimm: dimm to initialize
*/
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
{
struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc;
int rc = validate_dimm(ndd);
if (rc)
return rc;
if (cmd->config_size)
return 0; /* already valid */
memset(cmd, 0, sizeof(*cmd));
nd_desc = nvdimm_bus->nd_desc;
return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), NULL);
}
