linux/drivers/nvdimm/claim.c
Dan Williams a4574f63ed mm/memremap_pages: convert to 'struct range'
The 'struct resource' in 'struct dev_pagemap' is only used for holding
resource span information.  The other fields, 'name', 'flags', 'desc',
'parent', 'sibling', and 'child' are all unused wasted space.

This is in preparation for introducing a multi-range extension of
devm_memremap_pages().

The bulk of this change is unwinding all the places internal to libnvdimm
that used 'struct resource' unnecessarily, and replacing instances of
'struct dev_pagemap'.res with 'struct dev_pagemap'.range.

P2PDMA had a minor usage of the resource flags field, but only to report
failures with "%pR".  That is replaced with an open coded print of the
range.

[dan.carpenter@oracle.com: mm/hmm/test: use after free in dmirror_allocate_chunk()]
  Link: https://lkml.kernel.org/r/20200926121402.GA7467@kadam

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>	[xen]
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/159643103173.4062302.768998885691711532.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106115761.30709.13539840236873663620.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-13 18:38:28 -07:00

338 lines
7.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#include <linux/device.h>
#include <linux/sizes.h>
#include "nd-core.h"
#include "pmem.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);
}
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);
}
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;
}
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;
}
static int namespace_match(struct device *dev, void *data)
{
char *name = data;
return strcmp(name, dev_name(dev)) == 0;
}
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;
}
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;
}
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;
}
}
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, "namespace already active\n");
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);
switch (ndns->claim_class) {
case NVDIMM_CCLASS_NONE:
break;
case NVDIMM_CCLASS_BTT:
case NVDIMM_CCLASS_BTT2:
if (!is_nd_btt(dev)) {
len = -EBUSY;
goto out_attach;
}
break;
case NVDIMM_CCLASS_PFN:
if (!is_nd_pfn(dev)) {
len = -EBUSY;
goto out_attach;
}
break;
case NVDIMM_CCLASS_DAX:
if (!is_nd_dax(dev)) {
len = -EBUSY;
goto out_attach;
}
break;
default:
len = -EBUSY;
goto out_attach;
break;
}
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;
}
/*
* 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;
}
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, ret = 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;
if (copy_mc_to_kernel(buf, nsio->addr + offset, size) != 0)
return -EIO;
return 0;
}
if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
&& !(flags & NVDIMM_IO_ATOMIC)) {
long cleared;
might_sleep();
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);
}
arch_invalidate_pmem(nsio->addr + offset, size);
} else
rc = -EIO;
}
memcpy_flushcache(nsio->addr + offset, buf, size);
ret = nvdimm_flush(to_nd_region(ndns->dev.parent), NULL);
if (ret)
rc = ret;
return rc;
}
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
resource_size_t size)
{
struct nd_namespace_common *ndns = &nsio->common;
struct range range = {
.start = nsio->res.start,
.end = nsio->res.end,
};
nsio->size = size;
if (!devm_request_mem_region(dev, range.start, size,
dev_name(&ndns->dev))) {
dev_warn(dev, "could not reserve region %pR\n", &nsio->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,
&range);
nsio->addr = devm_memremap(dev, range.start, size, ARCH_MEMREMAP_PMEM);
return PTR_ERR_OR_ZERO(nsio->addr);
}
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, nsio->size);
}