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In response to an attempt to expand dev->lockdep_mutex for device_lock() validation [1], Peter points out [2] that the lockdep API already has the ability to assign a dedicated lock class per subsystem device-type. Use lockdep_set_class() to override the default device_lock() '__lockdep_no_validate__' class for each NVDIMM subsystem device-type. This enables lockdep to detect deadlocks and recursive locking within the device-driver core and the subsystem. Link: https://lore.kernel.org/r/164982968798.684294.15817853329823976469.stgit@dwillia2-desk3.amr.corp.intel.com [1] Link: https://lore.kernel.org/r/Ylf0dewci8myLvoW@hirez.programming.kicks-ass.net [2] Suggested-by: Peter Zijlstra <peterz@infradead.org> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/165055520896.3745911.8021255583475547548.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include "nd-core.h"
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#include "pfn.h"
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#include "nd.h"
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static void nd_dax_release(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_dax *nd_dax = to_nd_dax(dev);
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struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
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dev_dbg(dev, "trace\n");
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nd_detach_ndns(dev, &nd_pfn->ndns);
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ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
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kfree(nd_pfn->uuid);
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kfree(nd_dax);
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}
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struct nd_dax *to_nd_dax(struct device *dev)
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{
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struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
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WARN_ON(!is_nd_dax(dev));
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return nd_dax;
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}
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EXPORT_SYMBOL(to_nd_dax);
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static const struct device_type nd_dax_device_type = {
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.name = "nd_dax",
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.release = nd_dax_release,
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.groups = nd_pfn_attribute_groups,
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};
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bool is_nd_dax(struct device *dev)
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{
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return dev ? dev->type == &nd_dax_device_type : false;
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}
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EXPORT_SYMBOL(is_nd_dax);
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static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
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{
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struct nd_pfn *nd_pfn;
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struct nd_dax *nd_dax;
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struct device *dev;
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nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
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if (!nd_dax)
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return NULL;
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nd_pfn = &nd_dax->nd_pfn;
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nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
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if (nd_pfn->id < 0) {
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kfree(nd_dax);
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return NULL;
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}
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dev = &nd_pfn->dev;
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dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
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dev->type = &nd_dax_device_type;
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dev->parent = &nd_region->dev;
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return nd_dax;
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}
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struct device *nd_dax_create(struct nd_region *nd_region)
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{
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struct device *dev = NULL;
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struct nd_dax *nd_dax;
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if (!is_memory(&nd_region->dev))
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return NULL;
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nd_dax = nd_dax_alloc(nd_region);
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if (nd_dax)
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dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
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nd_device_register(dev);
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return dev;
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}
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int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
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{
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int rc;
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struct nd_dax *nd_dax;
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struct device *dax_dev;
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struct nd_pfn *nd_pfn;
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struct nd_pfn_sb *pfn_sb;
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struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
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if (ndns->force_raw)
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return -ENODEV;
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switch (ndns->claim_class) {
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case NVDIMM_CCLASS_NONE:
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case NVDIMM_CCLASS_DAX:
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break;
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default:
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return -ENODEV;
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}
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nvdimm_bus_lock(&ndns->dev);
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nd_dax = nd_dax_alloc(nd_region);
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nd_pfn = &nd_dax->nd_pfn;
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dax_dev = nd_pfn_devinit(nd_pfn, ndns);
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nvdimm_bus_unlock(&ndns->dev);
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if (!dax_dev)
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return -ENOMEM;
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pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
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nd_pfn->pfn_sb = pfn_sb;
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rc = nd_pfn_validate(nd_pfn, DAX_SIG);
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dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
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if (rc < 0) {
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nd_detach_ndns(dax_dev, &nd_pfn->ndns);
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put_device(dax_dev);
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} else
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nd_device_register(dax_dev);
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return rc;
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}
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EXPORT_SYMBOL(nd_dax_probe);
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