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1334 lines
31 KiB
1334 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!try_module_get(provider)) |
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return -ENXIO; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (dev->driver) |
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nd_drv = to_nd_device_driver(dev->driver); |
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|
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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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|
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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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|
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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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|
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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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|
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if (!nvdimm_bus) |
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return; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (nd_region->bb_state) |
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sysfs_notify_dirent(nd_region->bb_state); |
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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!nvdimm_bus) |
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return -ENXIO; |
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|
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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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|
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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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|
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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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|
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nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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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); |
|
if (rc) |
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return rc; |
|
|
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mutex_lock(&nvdimm_bus_list_mutex); |
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list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); |
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mutex_unlock(&nvdimm_bus_list_mutex); |
|
|
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/* enable bus provider attributes to look up their local context */ |
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dev_set_drvdata(dev, nvdimm_bus->nd_desc); |
|
|
|
return 0; |
|
} |
|
|
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static struct nd_device_driver nd_bus_driver = { |
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.probe = nd_bus_probe, |
|
.remove = nd_bus_remove, |
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.drv = { |
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.name = "nd_bus", |
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.suppress_bind_attrs = true, |
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.bus = &nvdimm_bus_type, |
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.owner = THIS_MODULE, |
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.mod_name = KBUILD_MODNAME, |
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}, |
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}; |
|
|
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static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
|
{ |
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struct nd_device_driver *nd_drv = to_nd_device_driver(drv); |
|
|
|
if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) |
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return true; |
|
|
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return !!test_bit(to_nd_device_type(dev), &nd_drv->type); |
|
} |
|
|
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static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
|
|
|
void nd_synchronize(void) |
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{ |
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async_synchronize_full_domain(&nd_async_domain); |
|
} |
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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) |
|
{ |
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struct device *dev = d; |
|
|
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/* flush bus operations before delete */ |
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nvdimm_bus_lock(dev); |
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nvdimm_bus_unlock(dev); |
|
|
|
device_unregister(dev); |
|
put_device(dev); |
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} |
|
|
|
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); |
|
}
|
|
|