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1025 lines
25 KiB
1025 lines
25 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/moduleparam.h> |
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#include <linux/vmalloc.h> |
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#include <linux/device.h> |
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#include <linux/ndctl.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include "nd-core.h" |
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#include "label.h" |
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#include "pmem.h" |
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#include "nd.h" |
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|
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static DEFINE_IDA(dimm_ida); |
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|
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static bool noblk; |
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module_param(noblk, bool, 0444); |
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MODULE_PARM_DESC(noblk, "force disable BLK / local alias support"); |
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|
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/* |
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* Retrieve bus and dimm handle and return if this bus supports |
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* get_config_data commands |
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*/ |
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int nvdimm_check_config_data(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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|
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if (!nvdimm->cmd_mask || |
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!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) { |
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if (test_bit(NDD_LABELING, &nvdimm->flags)) |
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return -ENXIO; |
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else |
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return -ENOTTY; |
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} |
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|
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return 0; |
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} |
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|
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static int validate_dimm(struct nvdimm_drvdata *ndd) |
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{ |
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int rc; |
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|
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if (!ndd) |
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return -EINVAL; |
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|
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rc = nvdimm_check_config_data(ndd->dev); |
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if (rc) |
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dev_dbg(ndd->dev, "%ps: %s error: %d\n", |
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__builtin_return_address(0), __func__, rc); |
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return rc; |
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} |
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|
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/** |
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* nvdimm_init_nsarea - determine the geometry of a dimm's namespace area |
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* @nvdimm: dimm to initialize |
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*/ |
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int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd) |
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{ |
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struct nd_cmd_get_config_size *cmd = &ndd->nsarea; |
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); |
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struct nvdimm_bus_descriptor *nd_desc; |
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int rc = validate_dimm(ndd); |
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int cmd_rc = 0; |
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|
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if (rc) |
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return rc; |
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|
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if (cmd->config_size) |
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return 0; /* already valid */ |
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|
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memset(cmd, 0, sizeof(*cmd)); |
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nd_desc = nvdimm_bus->nd_desc; |
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), |
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ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc); |
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if (rc < 0) |
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return rc; |
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return cmd_rc; |
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} |
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|
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int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf, |
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size_t offset, size_t len) |
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{ |
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); |
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
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int rc = validate_dimm(ndd), cmd_rc = 0; |
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struct nd_cmd_get_config_data_hdr *cmd; |
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size_t max_cmd_size, buf_offset; |
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|
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if (rc) |
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return rc; |
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|
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if (offset + len > ndd->nsarea.config_size) |
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return -ENXIO; |
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|
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max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer); |
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cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL); |
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if (!cmd) |
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return -ENOMEM; |
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|
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for (buf_offset = 0; len; |
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len -= cmd->in_length, buf_offset += cmd->in_length) { |
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size_t cmd_size; |
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|
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cmd->in_offset = offset + buf_offset; |
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cmd->in_length = min(max_cmd_size, len); |
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cmd_size = sizeof(*cmd) + cmd->in_length; |
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), |
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ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc); |
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if (rc < 0) |
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break; |
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if (cmd_rc < 0) { |
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rc = cmd_rc; |
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break; |
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} |
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|
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/* out_buf should be valid, copy it into our output buffer */ |
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memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length); |
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} |
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kvfree(cmd); |
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return rc; |
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} |
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int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, |
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void *buf, size_t len) |
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{ |
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size_t max_cmd_size, buf_offset; |
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struct nd_cmd_set_config_hdr *cmd; |
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int rc = validate_dimm(ndd), cmd_rc = 0; |
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); |
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
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if (rc) |
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return rc; |
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if (offset + len > ndd->nsarea.config_size) |
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return -ENXIO; |
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max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer); |
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cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL); |
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if (!cmd) |
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return -ENOMEM; |
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for (buf_offset = 0; len; len -= cmd->in_length, |
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buf_offset += cmd->in_length) { |
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size_t cmd_size; |
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cmd->in_offset = offset + buf_offset; |
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cmd->in_length = min(max_cmd_size, len); |
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memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length); |
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/* status is output in the last 4-bytes of the command buffer */ |
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cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32); |
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), |
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ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc); |
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if (rc < 0) |
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break; |
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if (cmd_rc < 0) { |
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rc = cmd_rc; |
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break; |
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} |
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} |
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kvfree(cmd); |
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return rc; |
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} |
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void nvdimm_set_labeling(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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set_bit(NDD_LABELING, &nvdimm->flags); |
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} |
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void nvdimm_set_locked(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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set_bit(NDD_LOCKED, &nvdimm->flags); |
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} |
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void nvdimm_clear_locked(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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clear_bit(NDD_LOCKED, &nvdimm->flags); |
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} |
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static void nvdimm_release(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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ida_simple_remove(&dimm_ida, nvdimm->id); |
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kfree(nvdimm); |
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} |
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struct nvdimm *to_nvdimm(struct device *dev) |
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{ |
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struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev); |
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|
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WARN_ON(!is_nvdimm(dev)); |
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return nvdimm; |
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} |
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EXPORT_SYMBOL_GPL(to_nvdimm); |
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struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr) |
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{ |
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struct nd_region *nd_region = &ndbr->nd_region; |
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struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
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return nd_mapping->nvdimm; |
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} |
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EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm); |
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unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr) |
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{ |
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/* pmem mapping properties are private to libnvdimm */ |
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return ARCH_MEMREMAP_PMEM; |
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} |
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EXPORT_SYMBOL_GPL(nd_blk_memremap_flags); |
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struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping) |
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{ |
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struct nvdimm *nvdimm = nd_mapping->nvdimm; |
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|
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WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); |
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return dev_get_drvdata(&nvdimm->dev); |
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} |
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EXPORT_SYMBOL(to_ndd); |
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|
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void nvdimm_drvdata_release(struct kref *kref) |
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{ |
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struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref); |
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struct device *dev = ndd->dev; |
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struct resource *res, *_r; |
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|
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dev_dbg(dev, "trace\n"); |
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nvdimm_bus_lock(dev); |
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for_each_dpa_resource_safe(ndd, res, _r) |
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nvdimm_free_dpa(ndd, res); |
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nvdimm_bus_unlock(dev); |
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kvfree(ndd->data); |
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kfree(ndd); |
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put_device(dev); |
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} |
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void get_ndd(struct nvdimm_drvdata *ndd) |
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{ |
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kref_get(&ndd->kref); |
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} |
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|
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void put_ndd(struct nvdimm_drvdata *ndd) |
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{ |
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if (ndd) |
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kref_put(&ndd->kref, nvdimm_drvdata_release); |
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} |
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const char *nvdimm_name(struct nvdimm *nvdimm) |
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{ |
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return dev_name(&nvdimm->dev); |
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} |
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EXPORT_SYMBOL_GPL(nvdimm_name); |
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struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) |
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{ |
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return &nvdimm->dev.kobj; |
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} |
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EXPORT_SYMBOL_GPL(nvdimm_kobj); |
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unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) |
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{ |
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return nvdimm->cmd_mask; |
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} |
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EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); |
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void *nvdimm_provider_data(struct nvdimm *nvdimm) |
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{ |
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if (nvdimm) |
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return nvdimm->provider_data; |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(nvdimm_provider_data); |
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static ssize_t commands_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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int cmd, len = 0; |
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|
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if (!nvdimm->cmd_mask) |
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return sprintf(buf, "\n"); |
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for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG) |
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len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd)); |
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len += sprintf(buf + len, "\n"); |
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return len; |
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} |
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static DEVICE_ATTR_RO(commands); |
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static ssize_t flags_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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return sprintf(buf, "%s%s%s\n", |
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test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "", |
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test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "", |
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test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : ""); |
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} |
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static DEVICE_ATTR_RO(flags); |
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static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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|
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/* |
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* The state may be in the process of changing, userspace should |
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* quiesce probing if it wants a static answer |
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*/ |
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nvdimm_bus_lock(dev); |
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nvdimm_bus_unlock(dev); |
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return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy) |
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? "active" : "idle"); |
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} |
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static DEVICE_ATTR_RO(state); |
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static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf) |
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{ |
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struct device *dev; |
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ssize_t rc; |
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u32 nfree; |
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if (!ndd) |
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return -ENXIO; |
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dev = ndd->dev; |
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nvdimm_bus_lock(dev); |
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nfree = nd_label_nfree(ndd); |
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if (nfree - 1 > nfree) { |
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dev_WARN_ONCE(dev, 1, "we ate our last label?\n"); |
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nfree = 0; |
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} else |
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nfree--; |
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rc = sprintf(buf, "%d\n", nfree); |
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nvdimm_bus_unlock(dev); |
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return rc; |
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} |
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static ssize_t available_slots_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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ssize_t rc; |
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|
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nd_device_lock(dev); |
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rc = __available_slots_show(dev_get_drvdata(dev), buf); |
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nd_device_unlock(dev); |
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return rc; |
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} |
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static DEVICE_ATTR_RO(available_slots); |
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__weak ssize_t security_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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|
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if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags)) |
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return sprintf(buf, "overwrite\n"); |
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if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags)) |
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return sprintf(buf, "disabled\n"); |
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if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags)) |
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return sprintf(buf, "unlocked\n"); |
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if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags)) |
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return sprintf(buf, "locked\n"); |
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return -ENOTTY; |
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} |
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|
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static ssize_t frozen_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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|
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return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN, |
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&nvdimm->sec.flags)); |
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} |
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static DEVICE_ATTR_RO(frozen); |
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static ssize_t security_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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{ |
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ssize_t rc; |
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/* |
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* Require all userspace triggered security management to be |
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* done while probing is idle and the DIMM is not in active use |
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* in any region. |
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*/ |
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nd_device_lock(dev); |
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nvdimm_bus_lock(dev); |
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wait_nvdimm_bus_probe_idle(dev); |
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rc = nvdimm_security_store(dev, buf, len); |
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nvdimm_bus_unlock(dev); |
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nd_device_unlock(dev); |
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return rc; |
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} |
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static DEVICE_ATTR_RW(security); |
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|
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static struct attribute *nvdimm_attributes[] = { |
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&dev_attr_state.attr, |
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&dev_attr_flags.attr, |
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&dev_attr_commands.attr, |
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&dev_attr_available_slots.attr, |
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&dev_attr_security.attr, |
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&dev_attr_frozen.attr, |
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NULL, |
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}; |
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|
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static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n) |
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{ |
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struct device *dev = container_of(kobj, typeof(*dev), kobj); |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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|
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if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr) |
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return a->mode; |
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if (!nvdimm->sec.flags) |
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return 0; |
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|
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if (a == &dev_attr_security.attr) { |
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/* Are there any state mutation ops (make writable)? */ |
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if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable |
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|| nvdimm->sec.ops->change_key |
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|| nvdimm->sec.ops->erase |
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|| nvdimm->sec.ops->overwrite) |
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return a->mode; |
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return 0444; |
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} |
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|
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if (nvdimm->sec.ops->freeze) |
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return a->mode; |
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return 0; |
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} |
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|
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static const struct attribute_group nvdimm_attribute_group = { |
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.attrs = nvdimm_attributes, |
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.is_visible = nvdimm_visible, |
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}; |
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|
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static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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enum nvdimm_fwa_result result; |
|
|
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if (!nvdimm->fw_ops) |
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return -EOPNOTSUPP; |
|
|
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nvdimm_bus_lock(dev); |
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result = nvdimm->fw_ops->activate_result(nvdimm); |
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nvdimm_bus_unlock(dev); |
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|
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switch (result) { |
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case NVDIMM_FWA_RESULT_NONE: |
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return sprintf(buf, "none\n"); |
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case NVDIMM_FWA_RESULT_SUCCESS: |
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return sprintf(buf, "success\n"); |
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case NVDIMM_FWA_RESULT_FAIL: |
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return sprintf(buf, "fail\n"); |
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case NVDIMM_FWA_RESULT_NOTSTAGED: |
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return sprintf(buf, "not_staged\n"); |
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case NVDIMM_FWA_RESULT_NEEDRESET: |
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return sprintf(buf, "need_reset\n"); |
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default: |
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return -ENXIO; |
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} |
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} |
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static DEVICE_ATTR_ADMIN_RO(result); |
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|
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static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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enum nvdimm_fwa_state state; |
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|
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if (!nvdimm->fw_ops) |
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return -EOPNOTSUPP; |
|
|
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nvdimm_bus_lock(dev); |
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state = nvdimm->fw_ops->activate_state(nvdimm); |
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nvdimm_bus_unlock(dev); |
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|
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switch (state) { |
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case NVDIMM_FWA_IDLE: |
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return sprintf(buf, "idle\n"); |
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case NVDIMM_FWA_BUSY: |
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return sprintf(buf, "busy\n"); |
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case NVDIMM_FWA_ARMED: |
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return sprintf(buf, "armed\n"); |
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default: |
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return -ENXIO; |
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} |
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} |
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|
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static ssize_t activate_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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enum nvdimm_fwa_trigger arg; |
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int rc; |
|
|
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if (!nvdimm->fw_ops) |
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return -EOPNOTSUPP; |
|
|
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if (sysfs_streq(buf, "arm")) |
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arg = NVDIMM_FWA_ARM; |
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else if (sysfs_streq(buf, "disarm")) |
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arg = NVDIMM_FWA_DISARM; |
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else |
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return -EINVAL; |
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|
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nvdimm_bus_lock(dev); |
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rc = nvdimm->fw_ops->arm(nvdimm, arg); |
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nvdimm_bus_unlock(dev); |
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|
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if (rc < 0) |
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return rc; |
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return len; |
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} |
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static DEVICE_ATTR_ADMIN_RW(activate); |
|
|
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static struct attribute *nvdimm_firmware_attributes[] = { |
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&dev_attr_activate.attr, |
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&dev_attr_result.attr, |
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NULL, |
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}; |
|
|
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static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n) |
|
{ |
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struct device *dev = container_of(kobj, typeof(*dev), kobj); |
|
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
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struct nvdimm *nvdimm = to_nvdimm(dev); |
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enum nvdimm_fwa_capability cap; |
|
|
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if (!nd_desc->fw_ops) |
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return 0; |
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if (!nvdimm->fw_ops) |
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return 0; |
|
|
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nvdimm_bus_lock(dev); |
|
cap = nd_desc->fw_ops->capability(nd_desc); |
|
nvdimm_bus_unlock(dev); |
|
|
|
if (cap < NVDIMM_FWA_CAP_QUIESCE) |
|
return 0; |
|
|
|
return a->mode; |
|
} |
|
|
|
static const struct attribute_group nvdimm_firmware_attribute_group = { |
|
.name = "firmware", |
|
.attrs = nvdimm_firmware_attributes, |
|
.is_visible = nvdimm_firmware_visible, |
|
}; |
|
|
|
static const struct attribute_group *nvdimm_attribute_groups[] = { |
|
&nd_device_attribute_group, |
|
&nvdimm_attribute_group, |
|
&nvdimm_firmware_attribute_group, |
|
NULL, |
|
}; |
|
|
|
static const struct device_type nvdimm_device_type = { |
|
.name = "nvdimm", |
|
.release = nvdimm_release, |
|
.groups = nvdimm_attribute_groups, |
|
}; |
|
|
|
bool is_nvdimm(struct device *dev) |
|
{ |
|
return dev->type == &nvdimm_device_type; |
|
} |
|
|
|
struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus, |
|
void *provider_data, const struct attribute_group **groups, |
|
unsigned long flags, unsigned long cmd_mask, int num_flush, |
|
struct resource *flush_wpq, const char *dimm_id, |
|
const struct nvdimm_security_ops *sec_ops, |
|
const struct nvdimm_fw_ops *fw_ops) |
|
{ |
|
struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL); |
|
struct device *dev; |
|
|
|
if (!nvdimm) |
|
return NULL; |
|
|
|
nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL); |
|
if (nvdimm->id < 0) { |
|
kfree(nvdimm); |
|
return NULL; |
|
} |
|
|
|
nvdimm->dimm_id = dimm_id; |
|
nvdimm->provider_data = provider_data; |
|
if (noblk) |
|
flags |= 1 << NDD_NOBLK; |
|
nvdimm->flags = flags; |
|
nvdimm->cmd_mask = cmd_mask; |
|
nvdimm->num_flush = num_flush; |
|
nvdimm->flush_wpq = flush_wpq; |
|
atomic_set(&nvdimm->busy, 0); |
|
dev = &nvdimm->dev; |
|
dev_set_name(dev, "nmem%d", nvdimm->id); |
|
dev->parent = &nvdimm_bus->dev; |
|
dev->type = &nvdimm_device_type; |
|
dev->devt = MKDEV(nvdimm_major, nvdimm->id); |
|
dev->groups = groups; |
|
nvdimm->sec.ops = sec_ops; |
|
nvdimm->fw_ops = fw_ops; |
|
nvdimm->sec.overwrite_tmo = 0; |
|
INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query); |
|
/* |
|
* Security state must be initialized before device_add() for |
|
* attribute visibility. |
|
*/ |
|
/* get security state and extended (master) state */ |
|
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); |
|
nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER); |
|
nd_device_register(dev); |
|
|
|
return nvdimm; |
|
} |
|
EXPORT_SYMBOL_GPL(__nvdimm_create); |
|
|
|
static void shutdown_security_notify(void *data) |
|
{ |
|
struct nvdimm *nvdimm = data; |
|
|
|
sysfs_put(nvdimm->sec.overwrite_state); |
|
} |
|
|
|
int nvdimm_security_setup_events(struct device *dev) |
|
{ |
|
struct nvdimm *nvdimm = to_nvdimm(dev); |
|
|
|
if (!nvdimm->sec.flags || !nvdimm->sec.ops |
|
|| !nvdimm->sec.ops->overwrite) |
|
return 0; |
|
nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security"); |
|
if (!nvdimm->sec.overwrite_state) |
|
return -ENOMEM; |
|
|
|
return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm); |
|
} |
|
EXPORT_SYMBOL_GPL(nvdimm_security_setup_events); |
|
|
|
int nvdimm_in_overwrite(struct nvdimm *nvdimm) |
|
{ |
|
return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); |
|
} |
|
EXPORT_SYMBOL_GPL(nvdimm_in_overwrite); |
|
|
|
int nvdimm_security_freeze(struct nvdimm *nvdimm) |
|
{ |
|
int rc; |
|
|
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); |
|
|
|
if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze) |
|
return -EOPNOTSUPP; |
|
|
|
if (!nvdimm->sec.flags) |
|
return -EIO; |
|
|
|
if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { |
|
dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n"); |
|
return -EBUSY; |
|
} |
|
|
|
rc = nvdimm->sec.ops->freeze(nvdimm); |
|
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); |
|
|
|
return rc; |
|
} |
|
|
|
static unsigned long dpa_align(struct nd_region *nd_region) |
|
{ |
|
struct device *dev = &nd_region->dev; |
|
|
|
if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), |
|
"bus lock required for capacity provision\n")) |
|
return 0; |
|
if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align |
|
% nd_region->ndr_mappings, |
|
"invalid region align %#lx mappings: %d\n", |
|
nd_region->align, nd_region->ndr_mappings)) |
|
return 0; |
|
return nd_region->align / nd_region->ndr_mappings; |
|
} |
|
|
|
int alias_dpa_busy(struct device *dev, void *data) |
|
{ |
|
resource_size_t map_end, blk_start, new; |
|
struct blk_alloc_info *info = data; |
|
struct nd_mapping *nd_mapping; |
|
struct nd_region *nd_region; |
|
struct nvdimm_drvdata *ndd; |
|
struct resource *res; |
|
unsigned long align; |
|
int i; |
|
|
|
if (!is_memory(dev)) |
|
return 0; |
|
|
|
nd_region = to_nd_region(dev); |
|
for (i = 0; i < nd_region->ndr_mappings; i++) { |
|
nd_mapping = &nd_region->mapping[i]; |
|
if (nd_mapping->nvdimm == info->nd_mapping->nvdimm) |
|
break; |
|
} |
|
|
|
if (i >= nd_region->ndr_mappings) |
|
return 0; |
|
|
|
ndd = to_ndd(nd_mapping); |
|
map_end = nd_mapping->start + nd_mapping->size - 1; |
|
blk_start = nd_mapping->start; |
|
|
|
/* |
|
* In the allocation case ->res is set to free space that we are |
|
* looking to validate against PMEM aliasing collision rules |
|
* (i.e. BLK is allocated after all aliased PMEM). |
|
*/ |
|
if (info->res) { |
|
if (info->res->start >= nd_mapping->start |
|
&& info->res->start < map_end) |
|
/* pass */; |
|
else |
|
return 0; |
|
} |
|
|
|
retry: |
|
/* |
|
* Find the free dpa from the end of the last pmem allocation to |
|
* the end of the interleave-set mapping. |
|
*/ |
|
align = dpa_align(nd_region); |
|
if (!align) |
|
return 0; |
|
|
|
for_each_dpa_resource(ndd, res) { |
|
resource_size_t start, end; |
|
|
|
if (strncmp(res->name, "pmem", 4) != 0) |
|
continue; |
|
|
|
start = ALIGN_DOWN(res->start, align); |
|
end = ALIGN(res->end + 1, align) - 1; |
|
if ((start >= blk_start && start < map_end) |
|
|| (end >= blk_start && end <= map_end)) { |
|
new = max(blk_start, min(map_end, end) + 1); |
|
if (new != blk_start) { |
|
blk_start = new; |
|
goto retry; |
|
} |
|
} |
|
} |
|
|
|
/* update the free space range with the probed blk_start */ |
|
if (info->res && blk_start > info->res->start) { |
|
info->res->start = max(info->res->start, blk_start); |
|
if (info->res->start > info->res->end) |
|
info->res->end = info->res->start - 1; |
|
return 1; |
|
} |
|
|
|
info->available -= blk_start - nd_mapping->start; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* nd_blk_available_dpa - account the unused dpa of BLK region |
|
* @nd_mapping: container of dpa-resource-root + labels |
|
* |
|
* Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but |
|
* we arrange for them to never start at an lower dpa than the last |
|
* PMEM allocation in an aliased region. |
|
*/ |
|
resource_size_t nd_blk_available_dpa(struct nd_region *nd_region) |
|
{ |
|
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); |
|
struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
|
struct blk_alloc_info info = { |
|
.nd_mapping = nd_mapping, |
|
.available = nd_mapping->size, |
|
.res = NULL, |
|
}; |
|
struct resource *res; |
|
unsigned long align; |
|
|
|
if (!ndd) |
|
return 0; |
|
|
|
device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy); |
|
|
|
/* now account for busy blk allocations in unaliased dpa */ |
|
align = dpa_align(nd_region); |
|
if (!align) |
|
return 0; |
|
for_each_dpa_resource(ndd, res) { |
|
resource_size_t start, end, size; |
|
|
|
if (strncmp(res->name, "blk", 3) != 0) |
|
continue; |
|
start = ALIGN_DOWN(res->start, align); |
|
end = ALIGN(res->end + 1, align) - 1; |
|
size = end - start + 1; |
|
if (size >= info.available) |
|
return 0; |
|
info.available -= size; |
|
} |
|
|
|
return info.available; |
|
} |
|
|
|
/** |
|
* nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max |
|
* contiguous unallocated dpa range. |
|
* @nd_region: constrain available space check to this reference region |
|
* @nd_mapping: container of dpa-resource-root + labels |
|
*/ |
|
resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region, |
|
struct nd_mapping *nd_mapping) |
|
{ |
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
|
struct nvdimm_bus *nvdimm_bus; |
|
resource_size_t max = 0; |
|
struct resource *res; |
|
unsigned long align; |
|
|
|
/* if a dimm is disabled the available capacity is zero */ |
|
if (!ndd) |
|
return 0; |
|
|
|
align = dpa_align(nd_region); |
|
if (!align) |
|
return 0; |
|
|
|
nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); |
|
if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm)) |
|
return 0; |
|
for_each_dpa_resource(ndd, res) { |
|
resource_size_t start, end; |
|
|
|
if (strcmp(res->name, "pmem-reserve") != 0) |
|
continue; |
|
/* trim free space relative to current alignment setting */ |
|
start = ALIGN(res->start, align); |
|
end = ALIGN_DOWN(res->end + 1, align) - 1; |
|
if (end < start) |
|
continue; |
|
if (end - start + 1 > max) |
|
max = end - start + 1; |
|
} |
|
release_free_pmem(nvdimm_bus, nd_mapping); |
|
return max; |
|
} |
|
|
|
/** |
|
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa |
|
* @nd_mapping: container of dpa-resource-root + labels |
|
* @nd_region: constrain available space check to this reference region |
|
* @overlap: calculate available space assuming this level of overlap |
|
* |
|
* Validate that a PMEM label, if present, aligns with the start of an |
|
* interleave set and truncate the available size at the lowest BLK |
|
* overlap point. |
|
* |
|
* The expectation is that this routine is called multiple times as it |
|
* probes for the largest BLK encroachment for any single member DIMM of |
|
* the interleave set. Once that value is determined the PMEM-limit for |
|
* the set can be established. |
|
*/ |
|
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, |
|
struct nd_mapping *nd_mapping, resource_size_t *overlap) |
|
{ |
|
resource_size_t map_start, map_end, busy = 0, available, blk_start; |
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
|
struct resource *res; |
|
const char *reason; |
|
unsigned long align; |
|
|
|
if (!ndd) |
|
return 0; |
|
|
|
align = dpa_align(nd_region); |
|
if (!align) |
|
return 0; |
|
|
|
map_start = nd_mapping->start; |
|
map_end = map_start + nd_mapping->size - 1; |
|
blk_start = max(map_start, map_end + 1 - *overlap); |
|
for_each_dpa_resource(ndd, res) { |
|
resource_size_t start, end; |
|
|
|
start = ALIGN_DOWN(res->start, align); |
|
end = ALIGN(res->end + 1, align) - 1; |
|
if (start >= map_start && start < map_end) { |
|
if (strncmp(res->name, "blk", 3) == 0) |
|
blk_start = min(blk_start, |
|
max(map_start, start)); |
|
else if (end > map_end) { |
|
reason = "misaligned to iset"; |
|
goto err; |
|
} else |
|
busy += end - start + 1; |
|
} else if (end >= map_start && end <= map_end) { |
|
if (strncmp(res->name, "blk", 3) == 0) { |
|
/* |
|
* If a BLK allocation overlaps the start of |
|
* PMEM the entire interleave set may now only |
|
* be used for BLK. |
|
*/ |
|
blk_start = map_start; |
|
} else |
|
busy += end - start + 1; |
|
} else if (map_start > start && map_start < end) { |
|
/* total eclipse of the mapping */ |
|
busy += nd_mapping->size; |
|
blk_start = map_start; |
|
} |
|
} |
|
|
|
*overlap = map_end + 1 - blk_start; |
|
available = blk_start - map_start; |
|
if (busy < available) |
|
return ALIGN_DOWN(available - busy, align); |
|
return 0; |
|
|
|
err: |
|
nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason); |
|
return 0; |
|
} |
|
|
|
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) |
|
{ |
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); |
|
kfree(res->name); |
|
__release_region(&ndd->dpa, res->start, resource_size(res)); |
|
} |
|
|
|
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, |
|
struct nd_label_id *label_id, resource_size_t start, |
|
resource_size_t n) |
|
{ |
|
char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); |
|
struct resource *res; |
|
|
|
if (!name) |
|
return NULL; |
|
|
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); |
|
res = __request_region(&ndd->dpa, start, n, name, 0); |
|
if (!res) |
|
kfree(name); |
|
return res; |
|
} |
|
|
|
/** |
|
* nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id |
|
* @nvdimm: container of dpa-resource-root + labels |
|
* @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid> |
|
*/ |
|
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, |
|
struct nd_label_id *label_id) |
|
{ |
|
resource_size_t allocated = 0; |
|
struct resource *res; |
|
|
|
for_each_dpa_resource(ndd, res) |
|
if (strcmp(res->name, label_id->id) == 0) |
|
allocated += resource_size(res); |
|
|
|
return allocated; |
|
} |
|
|
|
static int count_dimms(struct device *dev, void *c) |
|
{ |
|
int *count = c; |
|
|
|
if (is_nvdimm(dev)) |
|
(*count)++; |
|
return 0; |
|
} |
|
|
|
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) |
|
{ |
|
int count = 0; |
|
/* Flush any possible dimm registration failures */ |
|
nd_synchronize(); |
|
|
|
device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); |
|
dev_dbg(&nvdimm_bus->dev, "count: %d\n", count); |
|
if (count != dimm_count) |
|
return -ENXIO; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); |
|
|
|
void __exit nvdimm_devs_exit(void) |
|
{ |
|
ida_destroy(&dimm_ida); |
|
}
|
|
|