libnvdimm: Add a poison list and export badblocks

During region creation, perform Address Range Scrubs (ARS) for the SPA
(System Physical Address) ranges to retrieve known poison locations from
firmware. Add a new data structure 'nd_poison' which is used as a list
in nvdimm_bus to store these poison locations.

When creating a pmem namespace, if there is any known poison associated
with its physical address space, convert the poison ranges to bad sectors
that are exposed using the badblocks interface.

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vishal Verma 2015-12-24 19:21:43 -07:00 committed by Dan Williams
parent d26f73f083
commit 0caeef63e6
6 changed files with 406 additions and 0 deletions

View File

@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/acpi.h>
#include <linux/sort.h>
@ -1473,6 +1474,201 @@ static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
/* devm will free nfit_blk */
}
static int ars_get_cap(struct nvdimm_bus_descriptor *nd_desc,
struct nd_cmd_ars_cap *cmd, u64 addr, u64 length)
{
cmd->address = addr;
cmd->length = length;
return nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, cmd,
sizeof(*cmd));
}
static int ars_do_start(struct nvdimm_bus_descriptor *nd_desc,
struct nd_cmd_ars_start *cmd, u64 addr, u64 length)
{
int rc;
cmd->address = addr;
cmd->length = length;
cmd->type = ND_ARS_PERSISTENT;
while (1) {
rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, cmd,
sizeof(*cmd));
if (rc)
return rc;
switch (cmd->status) {
case 0:
return 0;
case 1:
/* ARS unsupported, but we should never get here */
return 0;
case 2:
return -EINVAL;
case 3:
/* ARS is in progress */
msleep(1000);
break;
default:
return -ENXIO;
}
}
}
static int ars_get_status(struct nvdimm_bus_descriptor *nd_desc,
struct nd_cmd_ars_status *cmd)
{
int rc;
while (1) {
rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, cmd,
sizeof(*cmd));
if (rc || cmd->status & 0xffff)
return -ENXIO;
/* Check extended status (Upper two bytes) */
switch (cmd->status >> 16) {
case 0:
return 0;
case 1:
/* ARS is in progress */
msleep(1000);
break;
case 2:
/* No ARS performed for the current boot */
return 0;
default:
return -ENXIO;
}
}
}
static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
struct nd_cmd_ars_status *ars_status, u64 start)
{
int rc;
u32 i;
/*
* The address field returned by ars_status should be either
* less than or equal to the address we last started ARS for.
* The (start, length) returned by ars_status should also have
* non-zero overlap with the range we started ARS for.
* If this is not the case, bail.
*/
if (ars_status->address > start ||
(ars_status->address + ars_status->length < start))
return -ENXIO;
for (i = 0; i < ars_status->num_records; i++) {
rc = nvdimm_bus_add_poison(nvdimm_bus,
ars_status->records[i].err_address,
ars_status->records[i].length);
if (rc)
return rc;
}
return 0;
}
static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
struct nd_region_desc *ndr_desc)
{
struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc;
struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
struct nd_cmd_ars_status *ars_status = NULL;
struct nd_cmd_ars_start *ars_start = NULL;
struct nd_cmd_ars_cap *ars_cap = NULL;
u64 start, len, cur, remaining;
int rc;
ars_cap = kzalloc(sizeof(*ars_cap), GFP_KERNEL);
if (!ars_cap)
return -ENOMEM;
start = ndr_desc->res->start;
len = ndr_desc->res->end - ndr_desc->res->start + 1;
rc = ars_get_cap(nd_desc, ars_cap, start, len);
if (rc)
goto out;
/*
* If ARS is unsupported, or if the 'Persistent Memory Scrub' flag in
* extended status is not set, skip this but continue initialization
*/
if ((ars_cap->status & 0xffff) ||
!(ars_cap->status >> 16 & ND_ARS_PERSISTENT)) {
dev_warn(acpi_desc->dev,
"ARS unsupported (status: 0x%x), won't create an error list\n",
ars_cap->status);
goto out;
}
/*
* Check if a full-range ARS has been run. If so, use those results
* without having to start a new ARS.
*/
ars_status = kzalloc(ars_cap->max_ars_out + sizeof(*ars_status),
GFP_KERNEL);
if (!ars_status) {
rc = -ENOMEM;
goto out;
}
rc = ars_get_status(nd_desc, ars_status);
if (rc)
goto out;
if (ars_status->address <= start &&
(ars_status->address + ars_status->length >= start + len)) {
rc = ars_status_process_records(nvdimm_bus, ars_status, start);
goto out;
}
/*
* ARS_STATUS can overflow if the number of poison entries found is
* greater than the maximum buffer size (ars_cap->max_ars_out)
* To detect overflow, check if the length field of ars_status
* is less than the length we supplied. If so, process the
* error entries we got, adjust the start point, and start again
*/
ars_start = kzalloc(sizeof(*ars_start), GFP_KERNEL);
if (!ars_start)
return -ENOMEM;
cur = start;
remaining = len;
do {
u64 done, end;
rc = ars_do_start(nd_desc, ars_start, cur, remaining);
if (rc)
goto out;
rc = ars_get_status(nd_desc, ars_status);
if (rc)
goto out;
rc = ars_status_process_records(nvdimm_bus, ars_status, cur);
if (rc)
goto out;
end = min(cur + remaining,
ars_status->address + ars_status->length);
done = end - cur;
cur += done;
remaining -= done;
} while (remaining);
out:
kfree(ars_cap);
kfree(ars_start);
kfree(ars_status);
return rc;
}
static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
struct acpi_nfit_memory_map *memdev,
@ -1585,6 +1781,13 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
nvdimm_bus = acpi_desc->nvdimm_bus;
if (nfit_spa_type(spa) == NFIT_SPA_PM) {
rc = acpi_nfit_find_poison(acpi_desc, ndr_desc);
if (rc) {
dev_err(acpi_desc->dev,
"error while performing ARS to find poison: %d\n",
rc);
return rc;
}
if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
return -ENOMEM;
} else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {

View File

@ -325,6 +325,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
if (!nvdimm_bus)
return NULL;
INIT_LIST_HEAD(&nvdimm_bus->list);
INIT_LIST_HEAD(&nvdimm_bus->poison_list);
init_waitqueue_head(&nvdimm_bus->probe_wait);
nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
mutex_init(&nvdimm_bus->reconfig_mutex);
@ -359,6 +360,191 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
}
EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
/**
* __add_badblock_range() - Convert a physical address range to bad sectors
* @disk: the disk associated with the namespace
* @ns_offset: namespace offset where the error range begins (in bytes)
* @len: number of bytes of poison to be added
*
* This assumes that the range provided with (ns_offset, len) is within
* the bounds of physical addresses for this namespace, i.e. lies in the
* interval [ns_start, ns_start + ns_size)
*/
static int __add_badblock_range(struct gendisk *disk, u64 ns_offset, u64 len)
{
unsigned int sector_size = queue_logical_block_size(disk->queue);
sector_t start_sector;
u64 num_sectors;
u32 rem;
int rc;
start_sector = div_u64(ns_offset, sector_size);
num_sectors = div_u64_rem(len, sector_size, &rem);
if (rem)
num_sectors++;
if (!disk->bb) {
rc = disk_alloc_badblocks(disk);
if (rc)
return rc;
}
if (unlikely(num_sectors > (u64)INT_MAX)) {
u64 remaining = num_sectors;
sector_t s = start_sector;
while (remaining) {
int done = min_t(u64, remaining, INT_MAX);
rc = disk_set_badblocks(disk, s, done);
if (rc)
return rc;
remaining -= done;
s += done;
}
return 0;
} else
return disk_set_badblocks(disk, start_sector, num_sectors);
}
/**
* nvdimm_namespace_add_poison() - Convert a list of poison ranges to badblocks
* @disk: the gendisk associated with the namespace where badblocks
* will be stored
* @offset: offset at the start of the namespace before 'sector 0'
* @ndns: the namespace containing poison ranges
*
* The poison list generated during NFIT initialization may contain multiple,
* possibly overlapping ranges in the SPA (System Physical Address) space.
* Compare each of these ranges to the namespace currently being initialized,
* and add badblocks to the gendisk for all matching sub-ranges
*
* Return:
* 0 - Success
*/
int nvdimm_namespace_add_poison(struct gendisk *disk, resource_size_t offset,
struct nd_namespace_common *ndns)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
struct nvdimm_bus *nvdimm_bus;
struct list_head *poison_list;
u64 ns_start, ns_end, ns_size;
struct nd_poison *pl;
int rc;
ns_size = nvdimm_namespace_capacity(ndns) - offset;
ns_start = nsio->res.start + offset;
ns_end = nsio->res.end;
nvdimm_bus = to_nvdimm_bus(nd_region->dev.parent);
poison_list = &nvdimm_bus->poison_list;
if (list_empty(poison_list))
return 0;
list_for_each_entry(pl, poison_list, list) {
u64 pl_end = pl->start + pl->length - 1;
/* Discard intervals with no intersection */
if (pl_end < ns_start)
continue;
if (pl->start > ns_end)
continue;
/* Deal with any overlap after start of the namespace */
if (pl->start >= ns_start) {
u64 start = pl->start;
u64 len;
if (pl_end <= ns_end)
len = pl->length;
else
len = ns_start + ns_size - pl->start;
rc = __add_badblock_range(disk, start - ns_start, len);
if (rc)
return rc;
dev_info(&nvdimm_bus->dev,
"Found a poison range (0x%llx, 0x%llx)\n",
start, len);
continue;
}
/* Deal with overlap for poison starting before the namespace */
if (pl->start < ns_start) {
u64 len;
if (pl_end < ns_end)
len = pl->start + pl->length - ns_start;
else
len = ns_size;
rc = __add_badblock_range(disk, 0, len);
if (rc)
return rc;
dev_info(&nvdimm_bus->dev,
"Found a poison range (0x%llx, 0x%llx)\n",
pl->start, len);
}
}
return 0;
}
EXPORT_SYMBOL_GPL(nvdimm_namespace_add_poison);
static int __add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
{
struct nd_poison *pl;
pl = kzalloc(sizeof(*pl), GFP_KERNEL);
if (!pl)
return -ENOMEM;
pl->start = addr;
pl->length = length;
list_add_tail(&pl->list, &nvdimm_bus->poison_list);
return 0;
}
int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
{
struct nd_poison *pl;
if (list_empty(&nvdimm_bus->poison_list))
return __add_poison(nvdimm_bus, addr, length);
/*
* There is a chance this is a duplicate, check for those first.
* This will be the common case as ARS_STATUS returns all known
* errors in the SPA space, and we can't query it per region
*/
list_for_each_entry(pl, &nvdimm_bus->poison_list, list)
if (pl->start == addr) {
/* If length has changed, update this list entry */
if (pl->length != length)
pl->length = length;
return 0;
}
/*
* If not a duplicate or a simple length update, add the entry as is,
* as any overlapping ranges will get resolved when the list is consumed
* and converted to badblocks
*/
return __add_poison(nvdimm_bus, addr, length);
}
EXPORT_SYMBOL_GPL(nvdimm_bus_add_poison);
static void free_poison_list(struct list_head *poison_list)
{
struct nd_poison *pl, *next;
list_for_each_entry_safe(pl, next, poison_list, list) {
list_del(&pl->list);
kfree(pl);
}
list_del_init(poison_list);
}
static int child_unregister(struct device *dev, void *data)
{
/*
@ -385,6 +571,7 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
nd_synchronize();
device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
free_poison_list(&nvdimm_bus->poison_list);
nvdimm_bus_destroy_ndctl(nvdimm_bus);
device_unregister(&nvdimm_bus->dev);

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@ -30,6 +30,7 @@ struct nvdimm_bus {
struct list_head list;
struct device dev;
int id, probe_active;
struct list_head poison_list;
struct mutex reconfig_mutex;
};
@ -89,4 +90,6 @@ bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach,
ssize_t nd_namespace_store(struct device *dev,
struct nd_namespace_common **_ndns, const char *buf,
size_t len);
int nvdimm_namespace_add_poison(struct gendisk *disk, resource_size_t offset,
struct nd_namespace_common *ndns);
#endif /* __ND_CORE_H__ */

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@ -38,6 +38,12 @@ enum {
#endif
};
struct nd_poison {
u64 start;
u64 length;
struct list_head list;
};
struct nvdimm_drvdata {
struct device *dev;
int nsindex_size;

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@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/pmem.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "pfn.h"
#include "nd.h"
@ -168,6 +169,7 @@ static int pmem_attach_disk(struct device *dev,
{
int nid = dev_to_node(dev);
struct gendisk *disk;
int ret;
pmem->pmem_queue = blk_alloc_queue_node(GFP_KERNEL, nid);
if (!pmem->pmem_queue)
@ -196,6 +198,10 @@ static int pmem_attach_disk(struct device *dev,
set_capacity(disk, (pmem->size - pmem->data_offset) / 512);
pmem->pmem_disk = disk;
ret = nvdimm_namespace_add_poison(disk, pmem->data_offset, ndns);
if (ret)
return ret;
add_disk(disk);
revalidate_disk(disk);

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@ -116,6 +116,7 @@ static inline struct nd_blk_region_desc *to_blk_region_desc(
}
int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length);
struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
#define nvdimm_bus_register(parent, desc) \