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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Dan Williams](/assets/img/avatar_default.png)
Previous kernels allowed the BLKROSET to override the disk's read-only
status. With that situation fixed the pmem driver needs to rely on
notification events to reevaluate the disk read-only status after the
host region has been marked read-write.
Recall that when libnvdimm determines that the persistent memory has
lost persistence (for example lack of energy to flush from DRAM to FLASH
on an NVDIMM-N device) it marks the region read-only, but that state can
be overridden by the user via:
echo 0 > /sys/bus/nd/devices/regionX/read_only
...to date there is no notification that the region has restored
persistence, so the user override is the only recovery.
Fixes: 52f019d43c
("block: add a hard-readonly flag to struct gendisk")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Vishal Verma <vishal.l.verma@intel.com>
Tested-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/161534060720.528671.2341213328968989192.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1334 lines
31 KiB
C
1334 lines
31 KiB
C
// 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/libnvdimm.h>
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#include <linux/sched/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/fcntl.h>
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#include <linux/async.h>
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#include <linux/genhd.h>
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#include <linux/ndctl.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "nd.h"
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#include "pfn.h"
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int nvdimm_major;
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static int nvdimm_bus_major;
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struct class *nd_class;
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static DEFINE_IDA(nd_ida);
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static int to_nd_device_type(struct device *dev)
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{
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if (is_nvdimm(dev))
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return ND_DEVICE_DIMM;
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else if (is_memory(dev))
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return ND_DEVICE_REGION_PMEM;
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else if (is_nd_blk(dev))
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return ND_DEVICE_REGION_BLK;
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else if (is_nd_dax(dev))
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return ND_DEVICE_DAX_PMEM;
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else if (is_nd_region(dev->parent))
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return nd_region_to_nstype(to_nd_region(dev->parent));
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return 0;
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}
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static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
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to_nd_device_type(dev));
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}
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static struct module *to_bus_provider(struct device *dev)
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{
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/* pin bus providers while regions are enabled */
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if (is_nd_region(dev)) {
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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return nvdimm_bus->nd_desc->module;
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}
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return NULL;
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}
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static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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nvdimm_bus->probe_active++;
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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if (--nvdimm_bus->probe_active == 0)
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wake_up(&nvdimm_bus->wait);
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static int nvdimm_bus_probe(struct device *dev)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
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struct module *provider = to_bus_provider(dev);
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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int rc;
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if (!try_module_get(provider))
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return -ENXIO;
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dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n",
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dev->driver->name, dev_name(dev));
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nvdimm_bus_probe_start(nvdimm_bus);
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debug_nvdimm_lock(dev);
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rc = nd_drv->probe(dev);
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debug_nvdimm_unlock(dev);
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if ((rc == 0 || rc == -EOPNOTSUPP) &&
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dev->parent && is_nd_region(dev->parent))
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nd_region_advance_seeds(to_nd_region(dev->parent), dev);
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nvdimm_bus_probe_end(nvdimm_bus);
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dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name,
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dev_name(dev), rc);
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if (rc != 0)
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module_put(provider);
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return rc;
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}
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static int nvdimm_bus_remove(struct device *dev)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
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struct module *provider = to_bus_provider(dev);
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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if (nd_drv->remove) {
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debug_nvdimm_lock(dev);
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nd_drv->remove(dev);
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debug_nvdimm_unlock(dev);
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}
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dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name,
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dev_name(dev));
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module_put(provider);
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return 0;
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}
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static void nvdimm_bus_shutdown(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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struct nd_device_driver *nd_drv = NULL;
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if (dev->driver)
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nd_drv = to_nd_device_driver(dev->driver);
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if (nd_drv && nd_drv->shutdown) {
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nd_drv->shutdown(dev);
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dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
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dev->driver->name, dev_name(dev));
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}
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}
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void nd_device_notify(struct device *dev, enum nvdimm_event event)
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{
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nd_device_lock(dev);
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if (dev->driver) {
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struct nd_device_driver *nd_drv;
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nd_drv = to_nd_device_driver(dev->driver);
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if (nd_drv->notify)
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nd_drv->notify(dev, event);
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}
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nd_device_unlock(dev);
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}
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EXPORT_SYMBOL(nd_device_notify);
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void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
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if (!nvdimm_bus)
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return;
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/* caller is responsible for holding a reference on the device */
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nd_device_notify(&nd_region->dev, event);
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}
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EXPORT_SYMBOL_GPL(nvdimm_region_notify);
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struct clear_badblocks_context {
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resource_size_t phys, cleared;
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};
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static int nvdimm_clear_badblocks_region(struct device *dev, void *data)
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{
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struct clear_badblocks_context *ctx = data;
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struct nd_region *nd_region;
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resource_size_t ndr_end;
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sector_t sector;
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/* make sure device is a region */
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if (!is_memory(dev))
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return 0;
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nd_region = to_nd_region(dev);
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ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1;
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/* make sure we are in the region */
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if (ctx->phys < nd_region->ndr_start
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|| (ctx->phys + ctx->cleared) > ndr_end)
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return 0;
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sector = (ctx->phys - nd_region->ndr_start) / 512;
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badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512);
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if (nd_region->bb_state)
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sysfs_notify_dirent(nd_region->bb_state);
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return 0;
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}
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static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus,
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phys_addr_t phys, u64 cleared)
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{
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struct clear_badblocks_context ctx = {
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.phys = phys,
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.cleared = cleared,
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};
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device_for_each_child(&nvdimm_bus->dev, &ctx,
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nvdimm_clear_badblocks_region);
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}
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static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus,
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phys_addr_t phys, u64 cleared)
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{
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if (cleared > 0)
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badrange_forget(&nvdimm_bus->badrange, phys, cleared);
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if (cleared > 0 && cleared / 512)
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nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared);
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}
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long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
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unsigned int len)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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struct nvdimm_bus_descriptor *nd_desc;
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struct nd_cmd_clear_error clear_err;
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struct nd_cmd_ars_cap ars_cap;
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u32 clear_err_unit, mask;
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unsigned int noio_flag;
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int cmd_rc, rc;
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if (!nvdimm_bus)
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return -ENXIO;
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nd_desc = nvdimm_bus->nd_desc;
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/*
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* if ndctl does not exist, it's PMEM_LEGACY and
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* we want to just pretend everything is handled.
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*/
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if (!nd_desc->ndctl)
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return len;
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memset(&ars_cap, 0, sizeof(ars_cap));
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ars_cap.address = phys;
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ars_cap.length = len;
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noio_flag = memalloc_noio_save();
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rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap,
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sizeof(ars_cap), &cmd_rc);
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memalloc_noio_restore(noio_flag);
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if (rc < 0)
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return rc;
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if (cmd_rc < 0)
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return cmd_rc;
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clear_err_unit = ars_cap.clear_err_unit;
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if (!clear_err_unit || !is_power_of_2(clear_err_unit))
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return -ENXIO;
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mask = clear_err_unit - 1;
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if ((phys | len) & mask)
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return -ENXIO;
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memset(&clear_err, 0, sizeof(clear_err));
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clear_err.address = phys;
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clear_err.length = len;
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noio_flag = memalloc_noio_save();
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rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err,
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sizeof(clear_err), &cmd_rc);
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memalloc_noio_restore(noio_flag);
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if (rc < 0)
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return rc;
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if (cmd_rc < 0)
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return cmd_rc;
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nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared);
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return clear_err.cleared;
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}
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EXPORT_SYMBOL_GPL(nvdimm_clear_poison);
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static int nvdimm_bus_match(struct device *dev, struct device_driver *drv);
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static struct bus_type nvdimm_bus_type = {
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.name = "nd",
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.uevent = nvdimm_bus_uevent,
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.match = nvdimm_bus_match,
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.probe = nvdimm_bus_probe,
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.remove = nvdimm_bus_remove,
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.shutdown = nvdimm_bus_shutdown,
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};
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static void nvdimm_bus_release(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus;
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nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
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ida_simple_remove(&nd_ida, nvdimm_bus->id);
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kfree(nvdimm_bus);
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}
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static const struct device_type nvdimm_bus_dev_type = {
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.release = nvdimm_bus_release,
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.groups = nvdimm_bus_attribute_groups,
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};
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bool is_nvdimm_bus(struct device *dev)
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{
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return dev->type == &nvdimm_bus_dev_type;
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}
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struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
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{
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struct device *dev;
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for (dev = nd_dev; dev; dev = dev->parent)
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if (is_nvdimm_bus(dev))
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break;
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dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
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if (dev)
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return to_nvdimm_bus(dev);
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return NULL;
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}
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struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus;
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nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
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WARN_ON(!is_nvdimm_bus(dev));
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return nvdimm_bus;
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}
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EXPORT_SYMBOL_GPL(to_nvdimm_bus);
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struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm)
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{
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return to_nvdimm_bus(nvdimm->dev.parent);
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}
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EXPORT_SYMBOL_GPL(nvdimm_to_bus);
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struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
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struct nvdimm_bus_descriptor *nd_desc)
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{
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struct nvdimm_bus *nvdimm_bus;
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int rc;
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nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
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if (!nvdimm_bus)
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return NULL;
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INIT_LIST_HEAD(&nvdimm_bus->list);
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INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
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init_waitqueue_head(&nvdimm_bus->wait);
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nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
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if (nvdimm_bus->id < 0) {
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kfree(nvdimm_bus);
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return NULL;
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}
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mutex_init(&nvdimm_bus->reconfig_mutex);
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badrange_init(&nvdimm_bus->badrange);
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nvdimm_bus->nd_desc = nd_desc;
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nvdimm_bus->dev.parent = parent;
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nvdimm_bus->dev.type = &nvdimm_bus_dev_type;
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nvdimm_bus->dev.groups = nd_desc->attr_groups;
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nvdimm_bus->dev.bus = &nvdimm_bus_type;
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nvdimm_bus->dev.of_node = nd_desc->of_node;
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dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
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rc = device_register(&nvdimm_bus->dev);
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if (rc) {
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dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
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goto err;
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}
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return nvdimm_bus;
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err:
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put_device(&nvdimm_bus->dev);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nvdimm_bus_register);
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void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
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{
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if (!nvdimm_bus)
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return;
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device_unregister(&nvdimm_bus->dev);
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}
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EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
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static int child_unregister(struct device *dev, void *data)
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{
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/*
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* the singular ndctl class device per bus needs to be
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* "device_destroy"ed, so skip it here
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*
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* i.e. remove classless children
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*/
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if (dev->class)
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return 0;
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if (is_nvdimm(dev)) {
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struct nvdimm *nvdimm = to_nvdimm(dev);
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bool dev_put = false;
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/* We are shutting down. Make state frozen artificially. */
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nvdimm_bus_lock(dev);
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set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
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if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
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dev_put = true;
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nvdimm_bus_unlock(dev);
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cancel_delayed_work_sync(&nvdimm->dwork);
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if (dev_put)
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put_device(dev);
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}
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nd_device_unregister(dev, ND_SYNC);
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return 0;
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}
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static void free_badrange_list(struct list_head *badrange_list)
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{
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struct badrange_entry *bre, *next;
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list_for_each_entry_safe(bre, next, badrange_list, list) {
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list_del(&bre->list);
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kfree(bre);
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}
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list_del_init(badrange_list);
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}
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static void nd_bus_remove(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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mutex_lock(&nvdimm_bus_list_mutex);
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list_del_init(&nvdimm_bus->list);
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mutex_unlock(&nvdimm_bus_list_mutex);
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wait_event(nvdimm_bus->wait,
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atomic_read(&nvdimm_bus->ioctl_active) == 0);
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nd_synchronize();
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device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
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spin_lock(&nvdimm_bus->badrange.lock);
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free_badrange_list(&nvdimm_bus->badrange.list);
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spin_unlock(&nvdimm_bus->badrange.lock);
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nvdimm_bus_destroy_ndctl(nvdimm_bus);
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}
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static int nd_bus_probe(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
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int rc;
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rc = nvdimm_bus_create_ndctl(nvdimm_bus);
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if (rc)
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return rc;
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mutex_lock(&nvdimm_bus_list_mutex);
|
|
list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
|
|
mutex_unlock(&nvdimm_bus_list_mutex);
|
|
|
|
/* enable bus provider attributes to look up their local context */
|
|
dev_set_drvdata(dev, nvdimm_bus->nd_desc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nd_device_driver nd_bus_driver = {
|
|
.probe = nd_bus_probe,
|
|
.remove = nd_bus_remove,
|
|
.drv = {
|
|
.name = "nd_bus",
|
|
.suppress_bind_attrs = true,
|
|
.bus = &nvdimm_bus_type,
|
|
.owner = THIS_MODULE,
|
|
.mod_name = KBUILD_MODNAME,
|
|
},
|
|
};
|
|
|
|
static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
|
|
|
|
if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver)
|
|
return true;
|
|
|
|
return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
|
|
}
|
|
|
|
static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
|
|
|
|
void nd_synchronize(void)
|
|
{
|
|
async_synchronize_full_domain(&nd_async_domain);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nd_synchronize);
|
|
|
|
static void nd_async_device_register(void *d, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = d;
|
|
|
|
if (device_add(dev) != 0) {
|
|
dev_err(dev, "%s: failed\n", __func__);
|
|
put_device(dev);
|
|
}
|
|
put_device(dev);
|
|
if (dev->parent)
|
|
put_device(dev->parent);
|
|
}
|
|
|
|
static void nd_async_device_unregister(void *d, async_cookie_t cookie)
|
|
{
|
|
struct device *dev = d;
|
|
|
|
/* flush bus operations before delete */
|
|
nvdimm_bus_lock(dev);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
}
|
|
|
|
void __nd_device_register(struct device *dev)
|
|
{
|
|
if (!dev)
|
|
return;
|
|
|
|
/*
|
|
* Ensure that region devices always have their NUMA node set as
|
|
* early as possible. This way we are able to make certain that
|
|
* any memory associated with the creation and the creation
|
|
* itself of the region is associated with the correct node.
|
|
*/
|
|
if (is_nd_region(dev))
|
|
set_dev_node(dev, to_nd_region(dev)->numa_node);
|
|
|
|
dev->bus = &nvdimm_bus_type;
|
|
if (dev->parent) {
|
|
get_device(dev->parent);
|
|
if (dev_to_node(dev) == NUMA_NO_NODE)
|
|
set_dev_node(dev, dev_to_node(dev->parent));
|
|
}
|
|
get_device(dev);
|
|
|
|
async_schedule_dev_domain(nd_async_device_register, dev,
|
|
&nd_async_domain);
|
|
}
|
|
|
|
void nd_device_register(struct device *dev)
|
|
{
|
|
device_initialize(dev);
|
|
__nd_device_register(dev);
|
|
}
|
|
EXPORT_SYMBOL(nd_device_register);
|
|
|
|
void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
|
|
{
|
|
bool killed;
|
|
|
|
switch (mode) {
|
|
case ND_ASYNC:
|
|
/*
|
|
* In the async case this is being triggered with the
|
|
* device lock held and the unregistration work needs to
|
|
* be moved out of line iff this is thread has won the
|
|
* race to schedule the deletion.
|
|
*/
|
|
if (!kill_device(dev))
|
|
return;
|
|
|
|
get_device(dev);
|
|
async_schedule_domain(nd_async_device_unregister, dev,
|
|
&nd_async_domain);
|
|
break;
|
|
case ND_SYNC:
|
|
/*
|
|
* In the sync case the device is being unregistered due
|
|
* to a state change of the parent. Claim the kill state
|
|
* to synchronize against other unregistration requests,
|
|
* or otherwise let the async path handle it if the
|
|
* unregistration was already queued.
|
|
*/
|
|
nd_device_lock(dev);
|
|
killed = kill_device(dev);
|
|
nd_device_unlock(dev);
|
|
|
|
if (!killed)
|
|
return;
|
|
|
|
nd_synchronize();
|
|
device_unregister(dev);
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(nd_device_unregister);
|
|
|
|
/**
|
|
* __nd_driver_register() - register a region or a namespace driver
|
|
* @nd_drv: driver to register
|
|
* @owner: automatically set by nd_driver_register() macro
|
|
* @mod_name: automatically set by nd_driver_register() macro
|
|
*/
|
|
int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
struct device_driver *drv = &nd_drv->drv;
|
|
|
|
if (!nd_drv->type) {
|
|
pr_debug("driver type bitmask not set (%ps)\n",
|
|
__builtin_return_address(0));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!nd_drv->probe) {
|
|
pr_debug("%s ->probe() must be specified\n", mod_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
drv->bus = &nvdimm_bus_type;
|
|
drv->owner = owner;
|
|
drv->mod_name = mod_name;
|
|
|
|
return driver_register(drv);
|
|
}
|
|
EXPORT_SYMBOL(__nd_driver_register);
|
|
|
|
void nvdimm_check_and_set_ro(struct gendisk *disk)
|
|
{
|
|
struct device *dev = disk_to_dev(disk)->parent;
|
|
struct nd_region *nd_region = to_nd_region(dev->parent);
|
|
int disk_ro = get_disk_ro(disk);
|
|
|
|
/* catch the disk up with the region ro state */
|
|
if (disk_ro == nd_region->ro)
|
|
return;
|
|
|
|
dev_info(dev, "%s read-%s, marking %s read-%s\n",
|
|
dev_name(&nd_region->dev), nd_region->ro ? "only" : "write",
|
|
disk->disk_name, nd_region->ro ? "only" : "write");
|
|
set_disk_ro(disk, nd_region->ro);
|
|
}
|
|
EXPORT_SYMBOL(nvdimm_check_and_set_ro);
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
|
|
to_nd_device_type(dev));
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%s\n", dev->type->name);
|
|
}
|
|
static DEVICE_ATTR_RO(devtype);
|
|
|
|
static struct attribute *nd_device_attributes[] = {
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_devtype.attr,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* nd_device_attribute_group - generic attributes for all devices on an nd bus
|
|
*/
|
|
const struct attribute_group nd_device_attribute_group = {
|
|
.attrs = nd_device_attributes,
|
|
};
|
|
|
|
static ssize_t numa_node_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", dev_to_node(dev));
|
|
}
|
|
static DEVICE_ATTR_RO(numa_node);
|
|
|
|
static int nvdimm_dev_to_target_node(struct device *dev)
|
|
{
|
|
struct device *parent = dev->parent;
|
|
struct nd_region *nd_region = NULL;
|
|
|
|
if (is_nd_region(dev))
|
|
nd_region = to_nd_region(dev);
|
|
else if (parent && is_nd_region(parent))
|
|
nd_region = to_nd_region(parent);
|
|
|
|
if (!nd_region)
|
|
return NUMA_NO_NODE;
|
|
return nd_region->target_node;
|
|
}
|
|
|
|
static ssize_t target_node_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev));
|
|
}
|
|
static DEVICE_ATTR_RO(target_node);
|
|
|
|
static struct attribute *nd_numa_attributes[] = {
|
|
&dev_attr_numa_node.attr,
|
|
&dev_attr_target_node.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
|
|
int n)
|
|
{
|
|
struct device *dev = container_of(kobj, typeof(*dev), kobj);
|
|
|
|
if (!IS_ENABLED(CONFIG_NUMA))
|
|
return 0;
|
|
|
|
if (a == &dev_attr_target_node.attr &&
|
|
nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE)
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
/*
|
|
* nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
|
|
*/
|
|
const struct attribute_group nd_numa_attribute_group = {
|
|
.attrs = nd_numa_attributes,
|
|
.is_visible = nd_numa_attr_visible,
|
|
};
|
|
|
|
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
|
|
{
|
|
dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
|
|
struct device *dev;
|
|
|
|
dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
|
|
"ndctl%d", nvdimm_bus->id);
|
|
|
|
if (IS_ERR(dev))
|
|
dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
|
|
nvdimm_bus->id, PTR_ERR(dev));
|
|
return PTR_ERR_OR_ZERO(dev);
|
|
}
|
|
|
|
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
|
|
{
|
|
device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
|
|
}
|
|
|
|
static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
|
|
[ND_CMD_IMPLEMENTED] = { },
|
|
[ND_CMD_SMART] = {
|
|
.out_num = 2,
|
|
.out_sizes = { 4, 128, },
|
|
},
|
|
[ND_CMD_SMART_THRESHOLD] = {
|
|
.out_num = 2,
|
|
.out_sizes = { 4, 8, },
|
|
},
|
|
[ND_CMD_DIMM_FLAGS] = {
|
|
.out_num = 2,
|
|
.out_sizes = { 4, 4 },
|
|
},
|
|
[ND_CMD_GET_CONFIG_SIZE] = {
|
|
.out_num = 3,
|
|
.out_sizes = { 4, 4, 4, },
|
|
},
|
|
[ND_CMD_GET_CONFIG_DATA] = {
|
|
.in_num = 2,
|
|
.in_sizes = { 4, 4, },
|
|
.out_num = 2,
|
|
.out_sizes = { 4, UINT_MAX, },
|
|
},
|
|
[ND_CMD_SET_CONFIG_DATA] = {
|
|
.in_num = 3,
|
|
.in_sizes = { 4, 4, UINT_MAX, },
|
|
.out_num = 1,
|
|
.out_sizes = { 4, },
|
|
},
|
|
[ND_CMD_VENDOR] = {
|
|
.in_num = 3,
|
|
.in_sizes = { 4, 4, UINT_MAX, },
|
|
.out_num = 3,
|
|
.out_sizes = { 4, 4, UINT_MAX, },
|
|
},
|
|
[ND_CMD_CALL] = {
|
|
.in_num = 2,
|
|
.in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
|
|
.out_num = 1,
|
|
.out_sizes = { UINT_MAX, },
|
|
},
|
|
};
|
|
|
|
const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
|
|
{
|
|
if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
|
|
return &__nd_cmd_dimm_descs[cmd];
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
|
|
|
|
static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
|
|
[ND_CMD_IMPLEMENTED] = { },
|
|
[ND_CMD_ARS_CAP] = {
|
|
.in_num = 2,
|
|
.in_sizes = { 8, 8, },
|
|
.out_num = 4,
|
|
.out_sizes = { 4, 4, 4, 4, },
|
|
},
|
|
[ND_CMD_ARS_START] = {
|
|
.in_num = 5,
|
|
.in_sizes = { 8, 8, 2, 1, 5, },
|
|
.out_num = 2,
|
|
.out_sizes = { 4, 4, },
|
|
},
|
|
[ND_CMD_ARS_STATUS] = {
|
|
.out_num = 3,
|
|
.out_sizes = { 4, 4, UINT_MAX, },
|
|
},
|
|
[ND_CMD_CLEAR_ERROR] = {
|
|
.in_num = 2,
|
|
.in_sizes = { 8, 8, },
|
|
.out_num = 3,
|
|
.out_sizes = { 4, 4, 8, },
|
|
},
|
|
[ND_CMD_CALL] = {
|
|
.in_num = 2,
|
|
.in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
|
|
.out_num = 1,
|
|
.out_sizes = { UINT_MAX, },
|
|
},
|
|
};
|
|
|
|
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
|
|
{
|
|
if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
|
|
return &__nd_cmd_bus_descs[cmd];
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
|
|
|
|
u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
|
|
const struct nd_cmd_desc *desc, int idx, void *buf)
|
|
{
|
|
if (idx >= desc->in_num)
|
|
return UINT_MAX;
|
|
|
|
if (desc->in_sizes[idx] < UINT_MAX)
|
|
return desc->in_sizes[idx];
|
|
|
|
if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
|
|
struct nd_cmd_set_config_hdr *hdr = buf;
|
|
|
|
return hdr->in_length;
|
|
} else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
|
|
struct nd_cmd_vendor_hdr *hdr = buf;
|
|
|
|
return hdr->in_length;
|
|
} else if (cmd == ND_CMD_CALL) {
|
|
struct nd_cmd_pkg *pkg = buf;
|
|
|
|
return pkg->nd_size_in;
|
|
}
|
|
|
|
return UINT_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nd_cmd_in_size);
|
|
|
|
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
|
|
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
|
|
const u32 *out_field, unsigned long remainder)
|
|
{
|
|
if (idx >= desc->out_num)
|
|
return UINT_MAX;
|
|
|
|
if (desc->out_sizes[idx] < UINT_MAX)
|
|
return desc->out_sizes[idx];
|
|
|
|
if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
|
|
return in_field[1];
|
|
else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
|
|
return out_field[1];
|
|
else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
|
|
/*
|
|
* Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
|
|
* "Size of Output Buffer in bytes, including this
|
|
* field."
|
|
*/
|
|
if (out_field[1] < 4)
|
|
return 0;
|
|
/*
|
|
* ACPI 6.1 is ambiguous if 'status' is included in the
|
|
* output size. If we encounter an output size that
|
|
* overshoots the remainder by 4 bytes, assume it was
|
|
* including 'status'.
|
|
*/
|
|
if (out_field[1] - 4 == remainder)
|
|
return remainder;
|
|
return out_field[1] - 8;
|
|
} else if (cmd == ND_CMD_CALL) {
|
|
struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
|
|
|
|
return pkg->nd_size_out;
|
|
}
|
|
|
|
|
|
return UINT_MAX;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nd_cmd_out_size);
|
|
|
|
void wait_nvdimm_bus_probe_idle(struct device *dev)
|
|
{
|
|
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
|
|
|
|
do {
|
|
if (nvdimm_bus->probe_active == 0)
|
|
break;
|
|
nvdimm_bus_unlock(dev);
|
|
nd_device_unlock(dev);
|
|
wait_event(nvdimm_bus->wait,
|
|
nvdimm_bus->probe_active == 0);
|
|
nd_device_lock(dev);
|
|
nvdimm_bus_lock(dev);
|
|
} while (true);
|
|
}
|
|
|
|
static int nd_pmem_forget_poison_check(struct device *dev, void *data)
|
|
{
|
|
struct nd_cmd_clear_error *clear_err =
|
|
(struct nd_cmd_clear_error *)data;
|
|
struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
|
|
struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
|
|
struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
|
|
struct nd_namespace_common *ndns = NULL;
|
|
struct nd_namespace_io *nsio;
|
|
resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend;
|
|
|
|
if (nd_dax || !dev->driver)
|
|
return 0;
|
|
|
|
start = clear_err->address;
|
|
end = clear_err->address + clear_err->cleared - 1;
|
|
|
|
if (nd_btt || nd_pfn || nd_dax) {
|
|
if (nd_btt)
|
|
ndns = nd_btt->ndns;
|
|
else if (nd_pfn)
|
|
ndns = nd_pfn->ndns;
|
|
else if (nd_dax)
|
|
ndns = nd_dax->nd_pfn.ndns;
|
|
|
|
if (!ndns)
|
|
return 0;
|
|
} else
|
|
ndns = to_ndns(dev);
|
|
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
pstart = nsio->res.start + offset;
|
|
pend = nsio->res.end - end_trunc;
|
|
|
|
if ((pstart >= start) && (pend <= end))
|
|
return -EBUSY;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int nd_ns_forget_poison_check(struct device *dev, void *data)
|
|
{
|
|
return device_for_each_child(dev, data, nd_pmem_forget_poison_check);
|
|
}
|
|
|
|
/* set_config requires an idle interleave set */
|
|
static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
|
|
struct nvdimm *nvdimm, unsigned int cmd, void *data)
|
|
{
|
|
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
|
|
|
|
/* ask the bus provider if it would like to block this request */
|
|
if (nd_desc->clear_to_send) {
|
|
int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data);
|
|
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
/* require clear error to go through the pmem driver */
|
|
if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
|
|
return device_for_each_child(&nvdimm_bus->dev, data,
|
|
nd_ns_forget_poison_check);
|
|
|
|
if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
|
|
return 0;
|
|
|
|
/* prevent label manipulation while the kernel owns label updates */
|
|
wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
|
|
if (atomic_read(&nvdimm->busy))
|
|
return -EBUSY;
|
|
return 0;
|
|
}
|
|
|
|
static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
|
|
int read_only, unsigned int ioctl_cmd, unsigned long arg)
|
|
{
|
|
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
|
|
const struct nd_cmd_desc *desc = NULL;
|
|
unsigned int cmd = _IOC_NR(ioctl_cmd);
|
|
struct device *dev = &nvdimm_bus->dev;
|
|
void __user *p = (void __user *) arg;
|
|
char *out_env = NULL, *in_env = NULL;
|
|
const char *cmd_name, *dimm_name;
|
|
u32 in_len = 0, out_len = 0;
|
|
unsigned int func = cmd;
|
|
unsigned long cmd_mask;
|
|
struct nd_cmd_pkg pkg;
|
|
int rc, i, cmd_rc;
|
|
void *buf = NULL;
|
|
u64 buf_len = 0;
|
|
|
|
if (nvdimm) {
|
|
desc = nd_cmd_dimm_desc(cmd);
|
|
cmd_name = nvdimm_cmd_name(cmd);
|
|
cmd_mask = nvdimm->cmd_mask;
|
|
dimm_name = dev_name(&nvdimm->dev);
|
|
} else {
|
|
desc = nd_cmd_bus_desc(cmd);
|
|
cmd_name = nvdimm_bus_cmd_name(cmd);
|
|
cmd_mask = nd_desc->cmd_mask;
|
|
dimm_name = "bus";
|
|
}
|
|
|
|
/* Validate command family support against bus declared support */
|
|
if (cmd == ND_CMD_CALL) {
|
|
unsigned long *mask;
|
|
|
|
if (copy_from_user(&pkg, p, sizeof(pkg)))
|
|
return -EFAULT;
|
|
|
|
if (nvdimm) {
|
|
if (pkg.nd_family > NVDIMM_FAMILY_MAX)
|
|
return -EINVAL;
|
|
mask = &nd_desc->dimm_family_mask;
|
|
} else {
|
|
if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX)
|
|
return -EINVAL;
|
|
mask = &nd_desc->bus_family_mask;
|
|
}
|
|
|
|
if (!test_bit(pkg.nd_family, mask))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!desc ||
|
|
(desc->out_num + desc->in_num == 0) ||
|
|
cmd > ND_CMD_CALL ||
|
|
!test_bit(cmd, &cmd_mask))
|
|
return -ENOTTY;
|
|
|
|
/* fail write commands (when read-only) */
|
|
if (read_only)
|
|
switch (cmd) {
|
|
case ND_CMD_VENDOR:
|
|
case ND_CMD_SET_CONFIG_DATA:
|
|
case ND_CMD_ARS_START:
|
|
case ND_CMD_CLEAR_ERROR:
|
|
case ND_CMD_CALL:
|
|
dev_dbg(dev, "'%s' command while read-only.\n",
|
|
nvdimm ? nvdimm_cmd_name(cmd)
|
|
: nvdimm_bus_cmd_name(cmd));
|
|
return -EPERM;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* process an input envelope */
|
|
in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
|
|
if (!in_env)
|
|
return -ENOMEM;
|
|
for (i = 0; i < desc->in_num; i++) {
|
|
u32 in_size, copy;
|
|
|
|
in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
|
|
if (in_size == UINT_MAX) {
|
|
dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
|
|
__func__, dimm_name, cmd_name, i);
|
|
rc = -ENXIO;
|
|
goto out;
|
|
}
|
|
if (in_len < ND_CMD_MAX_ENVELOPE)
|
|
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
|
|
else
|
|
copy = 0;
|
|
if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
in_len += in_size;
|
|
}
|
|
|
|
if (cmd == ND_CMD_CALL) {
|
|
func = pkg.nd_command;
|
|
dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n",
|
|
dimm_name, pkg.nd_command,
|
|
in_len, out_len, buf_len);
|
|
}
|
|
|
|
/* process an output envelope */
|
|
out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
|
|
if (!out_env) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < desc->out_num; i++) {
|
|
u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
|
|
(u32 *) in_env, (u32 *) out_env, 0);
|
|
u32 copy;
|
|
|
|
if (out_size == UINT_MAX) {
|
|
dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
|
|
dimm_name, cmd_name, i);
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
if (out_len < ND_CMD_MAX_ENVELOPE)
|
|
copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
|
|
else
|
|
copy = 0;
|
|
if (copy && copy_from_user(&out_env[out_len],
|
|
p + in_len + out_len, copy)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
out_len += out_size;
|
|
}
|
|
|
|
buf_len = (u64) out_len + (u64) in_len;
|
|
if (buf_len > ND_IOCTL_MAX_BUFLEN) {
|
|
dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
|
|
cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
buf = vmalloc(buf_len);
|
|
if (!buf) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(buf, p, buf_len)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
nd_device_lock(dev);
|
|
nvdimm_bus_lock(dev);
|
|
rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc);
|
|
if (rc < 0)
|
|
goto out_unlock;
|
|
|
|
if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
|
|
struct nd_cmd_clear_error *clear_err = buf;
|
|
|
|
nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
|
|
clear_err->cleared);
|
|
}
|
|
|
|
if (copy_to_user(p, buf, buf_len))
|
|
rc = -EFAULT;
|
|
|
|
out_unlock:
|
|
nvdimm_bus_unlock(dev);
|
|
nd_device_unlock(dev);
|
|
out:
|
|
kfree(in_env);
|
|
kfree(out_env);
|
|
vfree(buf);
|
|
return rc;
|
|
}
|
|
|
|
enum nd_ioctl_mode {
|
|
BUS_IOCTL,
|
|
DIMM_IOCTL,
|
|
};
|
|
|
|
static int match_dimm(struct device *dev, void *data)
|
|
{
|
|
long id = (long) data;
|
|
|
|
if (is_nvdimm(dev)) {
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
|
|
return nvdimm->id == id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
|
|
enum nd_ioctl_mode mode)
|
|
|
|
{
|
|
struct nvdimm_bus *nvdimm_bus, *found = NULL;
|
|
long id = (long) file->private_data;
|
|
struct nvdimm *nvdimm = NULL;
|
|
int rc, ro;
|
|
|
|
ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
|
|
mutex_lock(&nvdimm_bus_list_mutex);
|
|
list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
|
|
if (mode == DIMM_IOCTL) {
|
|
struct device *dev;
|
|
|
|
dev = device_find_child(&nvdimm_bus->dev,
|
|
file->private_data, match_dimm);
|
|
if (!dev)
|
|
continue;
|
|
nvdimm = to_nvdimm(dev);
|
|
found = nvdimm_bus;
|
|
} else if (nvdimm_bus->id == id) {
|
|
found = nvdimm_bus;
|
|
}
|
|
|
|
if (found) {
|
|
atomic_inc(&nvdimm_bus->ioctl_active);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&nvdimm_bus_list_mutex);
|
|
|
|
if (!found)
|
|
return -ENXIO;
|
|
|
|
nvdimm_bus = found;
|
|
rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
|
|
|
|
if (nvdimm)
|
|
put_device(&nvdimm->dev);
|
|
if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
|
|
wake_up(&nvdimm_bus->wait);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return nd_ioctl(file, cmd, arg, BUS_IOCTL);
|
|
}
|
|
|
|
static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
|
|
}
|
|
|
|
static int nd_open(struct inode *inode, struct file *file)
|
|
{
|
|
long minor = iminor(inode);
|
|
|
|
file->private_data = (void *) minor;
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations nvdimm_bus_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = nd_open,
|
|
.unlocked_ioctl = bus_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static const struct file_operations nvdimm_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = nd_open,
|
|
.unlocked_ioctl = dimm_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
int __init nvdimm_bus_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = bus_register(&nvdimm_bus_type);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
|
|
if (rc < 0)
|
|
goto err_bus_chrdev;
|
|
nvdimm_bus_major = rc;
|
|
|
|
rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
|
|
if (rc < 0)
|
|
goto err_dimm_chrdev;
|
|
nvdimm_major = rc;
|
|
|
|
nd_class = class_create(THIS_MODULE, "nd");
|
|
if (IS_ERR(nd_class)) {
|
|
rc = PTR_ERR(nd_class);
|
|
goto err_class;
|
|
}
|
|
|
|
rc = driver_register(&nd_bus_driver.drv);
|
|
if (rc)
|
|
goto err_nd_bus;
|
|
|
|
return 0;
|
|
|
|
err_nd_bus:
|
|
class_destroy(nd_class);
|
|
err_class:
|
|
unregister_chrdev(nvdimm_major, "dimmctl");
|
|
err_dimm_chrdev:
|
|
unregister_chrdev(nvdimm_bus_major, "ndctl");
|
|
err_bus_chrdev:
|
|
bus_unregister(&nvdimm_bus_type);
|
|
|
|
return rc;
|
|
}
|
|
|
|
void nvdimm_bus_exit(void)
|
|
{
|
|
driver_unregister(&nd_bus_driver.drv);
|
|
class_destroy(nd_class);
|
|
unregister_chrdev(nvdimm_bus_major, "ndctl");
|
|
unregister_chrdev(nvdimm_major, "dimmctl");
|
|
bus_unregister(&nvdimm_bus_type);
|
|
ida_destroy(&nd_ida);
|
|
}
|