![Dan Williams](/assets/img/avatar_default.png)
Platforms like QEMU-KVM implement an NFIT table and label DSMs. However, since that environment does not define an aliased configuration, the labels are currently ignored and the kernel registers a single full-sized pmem-namespace per region. Now that the kernel supports sub-divisions of pmem regions the labels have a purpose. Arrange for the labels to be honored when we find an existing / valid namespace index block. Cc: <qemu-devel@nongnu.org> Cc: Haozhong Zhang <haozhong.zhang@intel.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
694 lines
17 KiB
C
694 lines
17 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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 "nd.h"
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static DEFINE_IDA(dimm_ida);
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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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if (!nvdimm->cmd_mask ||
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!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
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if (nvdimm->flags & NDD_ALIASING)
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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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return 0;
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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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if (!ndd)
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return -EINVAL;
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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, "%pf: %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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* 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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if (rc)
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return rc;
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if (cmd->config_size)
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return 0; /* already valid */
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memset(cmd, 0, sizeof(*cmd));
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nd_desc = nvdimm_bus->nd_desc;
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return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
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ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), NULL);
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}
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int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
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struct nd_cmd_get_config_data_hdr *cmd;
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struct nvdimm_bus_descriptor *nd_desc;
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int rc = validate_dimm(ndd);
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u32 max_cmd_size, config_size;
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size_t offset;
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if (rc)
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return rc;
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if (ndd->data)
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return 0;
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if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
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|| ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
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dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
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ndd->nsarea.max_xfer, ndd->nsarea.config_size);
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return -ENXIO;
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}
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ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
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if (!ndd->data)
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ndd->data = vmalloc(ndd->nsarea.config_size);
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if (!ndd->data)
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return -ENOMEM;
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max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer);
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cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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nd_desc = nvdimm_bus->nd_desc;
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for (config_size = ndd->nsarea.config_size, offset = 0;
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config_size; config_size -= cmd->in_length,
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offset += cmd->in_length) {
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cmd->in_length = min(config_size, max_cmd_size);
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cmd->in_offset = offset;
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
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ND_CMD_GET_CONFIG_DATA, cmd,
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cmd->in_length + sizeof(*cmd), NULL);
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if (rc || cmd->status) {
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rc = -ENXIO;
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break;
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}
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memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length);
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}
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dev_dbg(ndd->dev, "%s: len: %zu rc: %d\n", __func__, offset, rc);
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kfree(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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int rc = validate_dimm(ndd);
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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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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 (!ndd->data)
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return -ENXIO;
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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, PAGE_SIZE, len);
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max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer);
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cmd = kzalloc(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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u32 *status;
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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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status = ((void *) cmd) + cmd_size - 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, NULL);
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if (rc || *status) {
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rc = rc ? rc : -ENXIO;
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break;
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}
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}
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kfree(cmd);
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return rc;
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}
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void nvdimm_set_aliasing(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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nvdimm->flags |= NDD_ALIASING;
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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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static struct device_type nvdimm_device_type = {
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.name = "nvdimm",
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.release = nvdimm_release,
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};
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bool is_nvdimm(struct device *dev)
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{
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return dev->type == &nvdimm_device_type;
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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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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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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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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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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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dev_dbg(dev, "%s\n", __func__);
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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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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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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 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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* 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 device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm_drvdata *ndd = dev_get_drvdata(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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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 DEVICE_ATTR_RO(available_slots);
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static struct attribute *nvdimm_attributes[] = {
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&dev_attr_state.attr,
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&dev_attr_commands.attr,
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&dev_attr_available_slots.attr,
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NULL,
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};
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struct attribute_group nvdimm_attribute_group = {
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.attrs = nvdimm_attributes,
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};
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EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
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struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
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const struct attribute_group **groups, unsigned long flags,
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unsigned long cmd_mask, int num_flush,
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struct resource *flush_wpq)
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{
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struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
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struct device *dev;
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if (!nvdimm)
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return NULL;
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nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
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if (nvdimm->id < 0) {
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kfree(nvdimm);
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return NULL;
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}
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nvdimm->provider_data = provider_data;
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nvdimm->flags = flags;
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nvdimm->cmd_mask = cmd_mask;
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nvdimm->num_flush = num_flush;
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nvdimm->flush_wpq = flush_wpq;
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atomic_set(&nvdimm->busy, 0);
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dev = &nvdimm->dev;
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dev_set_name(dev, "nmem%d", nvdimm->id);
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dev->parent = &nvdimm_bus->dev;
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dev->type = &nvdimm_device_type;
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dev->devt = MKDEV(nvdimm_major, nvdimm->id);
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dev->groups = groups;
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nd_device_register(dev);
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return nvdimm;
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}
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EXPORT_SYMBOL_GPL(nvdimm_create);
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int alias_dpa_busy(struct device *dev, void *data)
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{
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resource_size_t map_end, blk_start, new, busy;
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struct blk_alloc_info *info = data;
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struct nd_mapping *nd_mapping;
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struct nd_region *nd_region;
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struct nvdimm_drvdata *ndd;
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struct resource *res;
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int i;
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if (!is_nd_pmem(dev))
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return 0;
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nd_region = to_nd_region(dev);
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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nd_mapping = &nd_region->mapping[i];
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if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
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break;
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}
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if (i >= nd_region->ndr_mappings)
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return 0;
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ndd = to_ndd(nd_mapping);
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map_end = nd_mapping->start + nd_mapping->size - 1;
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blk_start = nd_mapping->start;
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/*
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* In the allocation case ->res is set to free space that we are
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* looking to validate against PMEM aliasing collision rules
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* (i.e. BLK is allocated after all aliased PMEM).
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*/
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if (info->res) {
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if (info->res->start >= nd_mapping->start
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&& info->res->start < map_end)
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/* pass */;
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else
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return 0;
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}
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retry:
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/*
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* Find the free dpa from the end of the last pmem allocation to
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* the end of the interleave-set mapping that is not already
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* covered by a blk allocation.
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*/
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busy = 0;
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for_each_dpa_resource(ndd, res) {
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if ((res->start >= blk_start && res->start < map_end)
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|| (res->end >= blk_start
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&& res->end <= map_end)) {
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if (strncmp(res->name, "pmem", 4) == 0) {
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new = max(blk_start, min(map_end + 1,
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res->end + 1));
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if (new != blk_start) {
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blk_start = new;
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goto retry;
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}
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} else
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busy += min(map_end, res->end)
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- max(nd_mapping->start, res->start) + 1;
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} else if (nd_mapping->start > res->start
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&& map_end < res->end) {
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/* total eclipse of the PMEM region mapping */
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busy += nd_mapping->size;
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break;
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}
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}
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/* update the free space range with the probed blk_start */
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if (info->res && blk_start > info->res->start) {
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info->res->start = max(info->res->start, blk_start);
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if (info->res->start > info->res->end)
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info->res->end = info->res->start - 1;
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return 1;
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}
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info->available -= blk_start - nd_mapping->start + busy;
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return 0;
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}
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static int blk_dpa_busy(struct device *dev, void *data)
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{
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struct blk_alloc_info *info = data;
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struct nd_mapping *nd_mapping;
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struct nd_region *nd_region;
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resource_size_t map_end;
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int i;
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if (!is_nd_pmem(dev))
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return 0;
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nd_region = to_nd_region(dev);
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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nd_mapping = &nd_region->mapping[i];
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if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
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break;
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}
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if (i >= nd_region->ndr_mappings)
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return 0;
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|
|
map_end = nd_mapping->start + nd_mapping->size - 1;
|
|
if (info->res->start >= nd_mapping->start
|
|
&& info->res->start < map_end) {
|
|
if (info->res->end <= map_end) {
|
|
info->busy = 0;
|
|
return 1;
|
|
} else {
|
|
info->busy -= info->res->end - map_end;
|
|
return 0;
|
|
}
|
|
} else if (info->res->end >= nd_mapping->start
|
|
&& info->res->end <= map_end) {
|
|
info->busy -= nd_mapping->start - info->res->start;
|
|
return 0;
|
|
} else {
|
|
info->busy -= nd_mapping->size;
|
|
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;
|
|
|
|
if (!ndd)
|
|
return 0;
|
|
|
|
device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
|
|
|
|
/* now account for busy blk allocations in unaliased dpa */
|
|
for_each_dpa_resource(ndd, res) {
|
|
if (strncmp(res->name, "blk", 3) != 0)
|
|
continue;
|
|
|
|
info.res = res;
|
|
info.busy = resource_size(res);
|
|
device_for_each_child(&nvdimm_bus->dev, &info, blk_dpa_busy);
|
|
info.available -= info.busy;
|
|
}
|
|
|
|
return info.available;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (!ndd)
|
|
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) {
|
|
if (res->start >= map_start && res->start < map_end) {
|
|
if (strncmp(res->name, "blk", 3) == 0)
|
|
blk_start = min(blk_start,
|
|
max(map_start, res->start));
|
|
else if (res->end > map_end) {
|
|
reason = "misaligned to iset";
|
|
goto err;
|
|
} else
|
|
busy += resource_size(res);
|
|
} else if (res->end >= map_start && res->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 += resource_size(res);
|
|
} else if (map_start > res->start && map_start < res->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 available - busy;
|
|
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, "%s: count: %d\n", __func__, 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);
|
|
}
|