Release 4.12 drivers/nvdimm/claim.c
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include <linux/device.h>
#include <linux/sizes.h>
#include <linux/pmem.h>
#include "nd-core.h"
#include "pfn.h"
#include "btt.h"
#include "nd.h"
void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns)
{
struct nd_namespace_common *ndns = *_ndns;
struct nvdimm_bus *nvdimm_bus;
if (!ndns)
return;
nvdimm_bus = walk_to_nvdimm_bus(&ndns->dev);
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
dev_WARN_ONCE(dev, ndns->claim != dev, "%s: invalid claim\n", __func__);
ndns->claim = NULL;
*_ndns = NULL;
put_device(&ndns->dev);
}
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| Dan J Williams | 87 | 100.00% | 3 | 100.00% |
| Total | 87 | 100.00% | 3 | 100.00% |
void nd_detach_ndns(struct device *dev,
struct nd_namespace_common **_ndns)
{
struct nd_namespace_common *ndns = *_ndns;
if (!ndns)
return;
get_device(&ndns->dev);
nvdimm_bus_lock(&ndns->dev);
__nd_detach_ndns(dev, _ndns);
nvdimm_bus_unlock(&ndns->dev);
put_device(&ndns->dev);
}
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bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
struct nd_namespace_common **_ndns)
{
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&attach->dev);
if (attach->claim)
return false;
lockdep_assert_held(&nvdimm_bus->reconfig_mutex);
dev_WARN_ONCE(dev, *_ndns, "%s: invalid claim\n", __func__);
attach->claim = dev;
*_ndns = attach;
get_device(&attach->dev);
return true;
}
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| Dan J Williams | 85 | 100.00% | 3 | 100.00% |
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bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
struct nd_namespace_common **_ndns)
{
bool claimed;
nvdimm_bus_lock(&attach->dev);
claimed = __nd_attach_ndns(dev, attach, _ndns);
nvdimm_bus_unlock(&attach->dev);
return claimed;
}
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| Dan J Williams | 54 | 100.00% | 2 | 100.00% |
| Total | 54 | 100.00% | 2 | 100.00% |
static int namespace_match(struct device *dev, void *data)
{
char *name = data;
return strcmp(name, dev_name(dev)) == 0;
}
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| Total | 34 | 100.00% | 1 | 100.00% |
static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct device *seed = NULL;
if (is_nd_btt(dev))
seed = nd_region->btt_seed;
else if (is_nd_pfn(dev))
seed = nd_region->pfn_seed;
else if (is_nd_dax(dev))
seed = nd_region->dax_seed;
if (seed == dev || ndns || dev->driver)
return false;
return true;
}
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| Dan J Williams | 94 | 100.00% | 2 | 100.00% |
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struct nd_pfn *to_nd_pfn_safe(struct device *dev)
{
/*
* pfn device attributes are re-used by dax device instances, so we
* need to be careful to correct device-to-nd_pfn conversion.
*/
if (is_nd_pfn(dev))
return to_nd_pfn(dev);
if (is_nd_dax(dev)) {
struct nd_dax *nd_dax = to_nd_dax(dev);
return &nd_dax->nd_pfn;
}
WARN_ON(1);
return NULL;
}
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| Dan J Williams | 59 | 100.00% | 1 | 100.00% |
| Total | 59 | 100.00% | 1 | 100.00% |
static void nd_detach_and_reset(struct device *dev,
struct nd_namespace_common **_ndns)
{
/* detach the namespace and destroy / reset the device */
__nd_detach_ndns(dev, _ndns);
if (is_idle(dev, *_ndns)) {
nd_device_unregister(dev, ND_ASYNC);
} else if (is_nd_btt(dev)) {
struct nd_btt *nd_btt = to_nd_btt(dev);
nd_btt->lbasize = 0;
kfree(nd_btt->uuid);
nd_btt->uuid = NULL;
} else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
kfree(nd_pfn->uuid);
nd_pfn->uuid = NULL;
nd_pfn->mode = PFN_MODE_NONE;
}
}
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| Dan J Williams | 127 | 100.00% | 3 | 100.00% |
| Total | 127 | 100.00% | 3 | 100.00% |
ssize_t nd_namespace_store(struct device *dev,
struct nd_namespace_common **_ndns, const char *buf,
size_t len)
{
struct nd_namespace_common *ndns;
struct device *found;
char *name;
if (dev->driver) {
dev_dbg(dev, "%s: -EBUSY\n", __func__);
return -EBUSY;
}
name = kstrndup(buf, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
strim(name);
if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0)
/* pass */;
else {
len = -EINVAL;
goto out;
}
ndns = *_ndns;
if (strcmp(name, "") == 0) {
nd_detach_and_reset(dev, _ndns);
goto out;
} else if (ndns) {
dev_dbg(dev, "namespace already set to: %s\n",
dev_name(&ndns->dev));
len = -EBUSY;
goto out;
}
found = device_find_child(dev->parent, name, namespace_match);
if (!found) {
dev_dbg(dev, "'%s' not found under %s\n", name,
dev_name(dev->parent));
len = -ENODEV;
goto out;
}
ndns = to_ndns(found);
if (__nvdimm_namespace_capacity(ndns) < SZ_16M) {
dev_dbg(dev, "%s too small to host\n", name);
len = -ENXIO;
goto out_attach;
}
WARN_ON_ONCE(!is_nvdimm_bus_locked(dev));
if (!__nd_attach_ndns(dev, ndns, _ndns)) {
dev_dbg(dev, "%s already claimed\n",
dev_name(&ndns->dev));
len = -EBUSY;
}
out_attach:
put_device(&ndns->dev); /* from device_find_child */
out:
kfree(name);
return len;
}
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| Dan J Williams | 320 | 100.00% | 2 | 100.00% |
| Total | 320 | 100.00% | 2 | 100.00% |
/*
* nd_sb_checksum: compute checksum for a generic info block
*
* Returns a fletcher64 checksum of everything in the given info block
* except the last field (since that's where the checksum lives).
*/
u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb)
{
u64 sum;
__le64 sum_save;
BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K);
BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K);
sum_save = nd_gen_sb->checksum;
nd_gen_sb->checksum = 0;
sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1);
nd_gen_sb->checksum = sum_save;
return sum;
}
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| Dan J Williams | 85 | 100.00% | 1 | 100.00% |
| Total | 85 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL(nd_sb_checksum);
static int nsio_rw_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size, int rw,
unsigned long flags)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
sector_t sector = offset >> 9;
int rc = 0;
if (unlikely(!size))
return 0;
if (unlikely(offset + size > nsio->size)) {
dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
return -EFAULT;
}
if (rw == READ) {
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align)))
return -EIO;
return memcpy_mcsafe(buf, nsio->addr + offset, size);
}
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
/*
* FIXME: nsio_rw_bytes() may be called from atomic
* context in the btt case and the ACPI DSM path for
* clearing the error takes sleeping locks and allocates
* memory. An explicit error clearing path, and support
* for tracking badblocks in BTT metadata is needed to
* work around this collision.
*/
if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
&& !(flags & NVDIMM_IO_ATOMIC)
&& !ndns->claim) {
long cleared;
cleared = nvdimm_clear_poison(&ndns->dev,
nsio->res.start + offset, size);
if (cleared < size)
rc = -EIO;
if (cleared > 0 && cleared / 512) {
cleared /= 512;
badblocks_clear(&nsio->bb, sector, cleared);
}
invalidate_pmem(nsio->addr + offset, size);
} else
rc = -EIO;
}
memcpy_to_pmem(nsio->addr + offset, buf, size);
nvdimm_flush(to_nd_region(ndns->dev.parent));
return rc;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Dan J Williams | 172 | 54.43% | 5 | 62.50% |
| Dave Jiang | 128 | 40.51% | 1 | 12.50% |
| Vishal Verma | 10 | 3.16% | 1 | 12.50% |
| Toshi Kani | 6 | 1.90% | 1 | 12.50% |
| Total | 316 | 100.00% | 8 | 100.00% |
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio)
{
struct resource *res = &nsio->res;
struct nd_namespace_common *ndns = &nsio->common;
nsio->size = resource_size(res);
if (!devm_request_mem_region(dev, res->start, resource_size(res),
dev_name(&ndns->dev))) {
dev_warn(dev, "could not reserve region %pR\n", res);
return -EBUSY;
}
ndns->rw_bytes = nsio_rw_bytes;
if (devm_init_badblocks(dev, &nsio->bb))
return -ENOMEM;
nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
&nsio->res);
nsio->addr = devm_memremap(dev, res->start, resource_size(res),
ARCH_MEMREMAP_PMEM);
return PTR_ERR_OR_ZERO(nsio->addr);
}
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| Dan J Williams | 156 | 100.00% | 3 | 100.00% |
| Total | 156 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(devm_nsio_enable);
void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio)
{
struct resource *res = &nsio->res;
devm_memunmap(dev, nsio->addr);
devm_exit_badblocks(dev, &nsio->bb);
devm_release_mem_region(dev, res->start, resource_size(res));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dan J Williams | 58 | 100.00% | 1 | 100.00% |
| Total | 58 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(devm_nsio_disable);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dan J Williams | 1438 | 90.90% | 12 | 80.00% |
| Dave Jiang | 128 | 8.09% | 1 | 6.67% |
| Vishal Verma | 10 | 0.63% | 1 | 6.67% |
| Toshi Kani | 6 | 0.38% | 1 | 6.67% |
| Total | 1582 | 100.00% | 15 | 100.00% |
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