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8f4b01fcde
The nvdimm core currently maps the full namespace to an ioremap range while probing the namespace mode. This can result in probe failures on architectures that have limited ioremap space. For example, with a large btt namespace that consumes most of I/O remap range, depending on the sequence of namespace initialization, the user can find a pfn namespace initialization failure due to unavailable I/O remap space which nvdimm core uses for temporary mapping. nvdimm core can avoid this failure by only mapping the reserved info block area to check for pfn superblock type and map the full namespace resource only before using the namespace. Given that personalities like BTT can be layered on top of any namespace type create a generic form of devm_nsio_enable (devm_namespace_enable) and use it inside the per-personality attach routines. Now devm_namespace_enable() is always paired with disable unless the mapping is going to be used for long term runtime access. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Link: https://lore.kernel.org/r/20191017073308.32645-1-aneesh.kumar@linux.ibm.com [djbw: reworks to move devm_namespace_{en,dis}able into *attach helpers] Reported-by: kbuild test robot <lkp@intel.com> Link: https://lore.kernel.org/r/20191031105741.102793-2-aneesh.kumar@linux.ibm.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
335 lines
7.6 KiB
C
335 lines
7.6 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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#include <linux/device.h>
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#include <linux/sizes.h>
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#include "nd-core.h"
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#include "pmem.h"
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#include "pfn.h"
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#include "btt.h"
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#include "nd.h"
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void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
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{
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struct nd_namespace_common *ndns = *_ndns;
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struct nvdimm_bus *nvdimm_bus;
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if (!ndns)
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return;
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nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
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lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
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dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
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ndns->claim = NULL;
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*_ndns = NULL;
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put_device(&ndns->dev);
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}
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void nd_detach_ndns(struct device *dev,
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struct nd_namespace_common **_ndns)
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{
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struct nd_namespace_common *ndns = *_ndns;
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if (!ndns)
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return;
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get_device(&ndns->dev);
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nvdimm_bus_lock(&ndns->dev);
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__nd_detach_ndns(dev, _ndns);
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nvdimm_bus_unlock(&ndns->dev);
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put_device(&ndns->dev);
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}
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bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
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if (attach->claim)
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return false;
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lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
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dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
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attach->claim = dev;
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*_ndns = attach;
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get_device(&attach->dev);
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return true;
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}
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bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
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struct nd_namespace_common **_ndns)
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{
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bool claimed;
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nvdimm_bus_lock(&attach->dev);
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claimed = __nd_attach_ndns(dev, attach, _ndns);
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nvdimm_bus_unlock(&attach->dev);
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return claimed;
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}
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static int namespace_match(struct device *dev, void *data)
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{
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char *name = data;
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return strcmp(name, dev_name(dev)) == 0;
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}
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static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct device *seed = NULL;
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if (is_nd_btt(dev))
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seed = nd_region->btt_seed;
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else if (is_nd_pfn(dev))
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seed = nd_region->pfn_seed;
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else if (is_nd_dax(dev))
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seed = nd_region->dax_seed;
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if (seed == dev || ndns || dev->driver)
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return false;
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return true;
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}
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struct nd_pfn *to_nd_pfn_safe(struct device *dev)
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{
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/*
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* pfn device attributes are re-used by dax device instances, so we
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* need to be careful to correct device-to-nd_pfn conversion.
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*/
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if (is_nd_pfn(dev))
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return to_nd_pfn(dev);
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if (is_nd_dax(dev)) {
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struct nd_dax *nd_dax = to_nd_dax(dev);
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return &nd_dax->nd_pfn;
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}
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WARN_ON(1);
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return NULL;
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}
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static void nd_detach_and_reset(struct device *dev,
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struct nd_namespace_common **_ndns)
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{
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/* detach the namespace and destroy / reset the device */
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__nd_detach_ndns(dev, _ndns);
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if (is_idle(dev, *_ndns)) {
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nd_device_unregister(dev, ND_ASYNC);
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} else if (is_nd_btt(dev)) {
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struct nd_btt *nd_btt = to_nd_btt(dev);
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nd_btt->lbasize = 0;
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kfree(nd_btt->uuid);
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nd_btt->uuid = NULL;
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} else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
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struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
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kfree(nd_pfn->uuid);
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nd_pfn->uuid = NULL;
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nd_pfn->mode = PFN_MODE_NONE;
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}
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}
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ssize_t nd_namespace_store(struct device *dev,
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struct nd_namespace_common **_ndns, const char *buf,
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size_t len)
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{
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struct nd_namespace_common *ndns;
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struct device *found;
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char *name;
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if (dev->driver) {
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dev_dbg(dev, "namespace already active\n");
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return -EBUSY;
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}
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name = kstrndup(buf, len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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strim(name);
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if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
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/* pass */;
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else {
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len = -EINVAL;
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goto out;
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}
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ndns = *_ndns;
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if (strcmp(name, "") == 0) {
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nd_detach_and_reset(dev, _ndns);
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goto out;
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} else if (ndns) {
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dev_dbg(dev, "namespace already set to: %s\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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goto out;
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}
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found = device_find_child(dev->parent, name, namespace_match);
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if (!found) {
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dev_dbg(dev, "'%s' not found under %s\n", name,
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dev_name(dev->parent));
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len = -ENODEV;
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goto out;
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}
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ndns = to_ndns(found);
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switch (ndns->claim_class) {
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case NVDIMM_CCLASS_NONE:
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break;
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case NVDIMM_CCLASS_BTT:
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case NVDIMM_CCLASS_BTT2:
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if (!is_nd_btt(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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case NVDIMM_CCLASS_PFN:
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if (!is_nd_pfn(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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case NVDIMM_CCLASS_DAX:
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if (!is_nd_dax(dev)) {
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len = -EBUSY;
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goto out_attach;
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}
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break;
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default:
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len = -EBUSY;
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goto out_attach;
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break;
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}
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if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
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dev_dbg(dev, "%s too small to host\n", name);
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len = -ENXIO;
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goto out_attach;
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}
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WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
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if (!__nd_attach_ndns(dev, ndns, _ndns)) {
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dev_dbg(dev, "%s already claimed\n",
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dev_name(&ndns->dev));
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len = -EBUSY;
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}
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out_attach:
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put_device(&ndns->dev); /* from device_find_child */
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out:
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kfree(name);
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return len;
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}
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/*
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* nd_sb_checksum: compute checksum for a generic info block
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*
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* Returns a fletcher64 checksum of everything in the given info block
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* except the last field (since that's where the checksum lives).
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*/
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u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
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{
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u64 sum;
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__le64 sum_save;
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BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
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BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
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BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
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sum_save = nd_gen_sb->checksum;
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nd_gen_sb->checksum = 0;
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sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
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nd_gen_sb->checksum = sum_save;
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return sum;
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}
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EXPORT_SYMBOL(nd_sb_checksum);
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static int nsio_rw_bytes(struct nd_namespace_common *ndns,
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resource_size_t offset, void *buf, size_t size, int rw,
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unsigned long flags)
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{
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
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sector_t sector = offset >> 9;
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int rc = 0, ret = 0;
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if (unlikely(!size))
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return 0;
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if (unlikely(offset + size > nsio->size)) {
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dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
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return -EFAULT;
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}
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if (rw == READ) {
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if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
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return -EIO;
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if (memcpy_mcsafe(buf, nsio->addr + offset, size) != 0)
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return -EIO;
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return 0;
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}
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if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
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if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
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&& !(flags & NVDIMM_IO_ATOMIC)) {
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long cleared;
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might_sleep();
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cleared = nvdimm_clear_poison(&ndns->dev,
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nsio->res.start + offset, size);
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if (cleared < size)
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rc = -EIO;
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if (cleared > 0 && cleared / 512) {
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cleared /= 512;
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badblocks_clear(&nsio->bb, sector, cleared);
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}
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arch_invalidate_pmem(nsio->addr + offset, size);
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} else
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rc = -EIO;
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}
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memcpy_flushcache(nsio->addr + offset, buf, size);
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ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
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if (ret)
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rc = ret;
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return rc;
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}
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int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
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resource_size_t size)
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{
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struct resource *res = &nsio->res;
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struct nd_namespace_common *ndns = &nsio->common;
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nsio->size = size;
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if (!devm_request_mem_region(dev, res->start, size,
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dev_name(&ndns->dev))) {
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dev_warn(dev, "could not reserve region %pR\n", res);
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return -EBUSY;
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}
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ndns->rw_bytes = nsio_rw_bytes;
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if (devm_init_badblocks(dev, &nsio->bb))
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return -ENOMEM;
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nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
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&nsio->res);
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nsio->addr = devm_memremap(dev, res->start, size, ARCH_MEMREMAP_PMEM);
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return PTR_ERR_OR_ZERO(nsio->addr);
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}
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void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
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{
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struct resource *res = &nsio->res;
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devm_memunmap(dev, nsio->addr);
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devm_exit_badblocks(dev, &nsio->bb);
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devm_release_mem_region(dev, res->start, nsio->size);
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}
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