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libnvdimm, nfit: add interleave-set state-tracking infrastructure

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On platforms that have firmware support for reading/writing per-dimm
label space, a portion of the dimm may be accessible via an interleave
set PMEM mapping in addition to the dimm's BLK (block-data-window
aperture(s)) interface.  A label, stored in a "configuration data
region" on the dimm, disambiguates which dimm addresses are accessed
through which exclusive interface.

Add infrastructure that allows the kernel to block modifications to a
label in the set while any member dimm is active.  Note that this is
meant only for enforcing "no modifications of active labels" via the
coarse ioctl command.  Adding/deleting namespaces from an active
interleave set is always possible via sysfs.

Another aspect of tracking interleave sets is tracking their integrity
when DIMMs in a set are physically re-ordered.  For this purpose we
generate an "interleave-set cookie" that can be recorded in a label and
validated against the current configuration.  It is the bus provider
implementation's responsibility to calculate the interleave set cookie
and attach it to a given region.

Cc: Neil Brown <[email protected]>
Cc: <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Robert Moore <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2015-05-01 13:11:27 -04:00
commit eaf961536e
8 changed files with 269 additions and 5 deletions
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93
drivers/acpi/nfit.c
View file

@ -16,6 +16,7 @@
#include <linux/ndctl.h>
#include <linux/list.h>
#include <linux/acpi.h>
#include <linux/sort.h>
#include "nfit.h"
static bool force_enable_dimms;
@ -785,6 +786,91 @@ static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
NULL,
};
/* enough info to uniquely specify an interleave set */
struct nfit_set_info {
struct nfit_set_info_map {
u64 region_offset;
u32 serial_number;
u32 pad;
} mapping[0];
};
static size_t sizeof_nfit_set_info(int num_mappings)
{
return sizeof(struct nfit_set_info)
+ num_mappings * sizeof(struct nfit_set_info_map);
}
static int cmp_map(const void *m0, const void *m1)
{
const struct nfit_set_info_map *map0 = m0;
const struct nfit_set_info_map *map1 = m1;
return memcmp(&map0->region_offset, &map1->region_offset,
sizeof(u64));
}
/* Retrieve the nth entry referencing this spa */
static struct acpi_nfit_memory_map *memdev_from_spa(
struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
{
struct nfit_memdev *nfit_memdev;
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
if (nfit_memdev->memdev->range_index == range_index)
if (n-- == 0)
return nfit_memdev->memdev;
return NULL;
}
static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
struct nd_region_desc *ndr_desc,
struct acpi_nfit_system_address *spa)
{
int i, spa_type = nfit_spa_type(spa);
struct device *dev = acpi_desc->dev;
struct nd_interleave_set *nd_set;
u16 nr = ndr_desc->num_mappings;
struct nfit_set_info *info;
if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
/* pass */;
else
return 0;
nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
if (!nd_set)
return -ENOMEM;
info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
if (!info)
return -ENOMEM;
for (i = 0; i < nr; i++) {
struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
struct nfit_set_info_map *map = &info->mapping[i];
struct nvdimm *nvdimm = nd_mapping->nvdimm;
struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
spa->range_index, i);
if (!memdev || !nfit_mem->dcr) {
dev_err(dev, "%s: failed to find DCR\n", __func__);
return -ENODEV;
}
map->region_offset = memdev->region_offset;
map->serial_number = nfit_mem->dcr->serial_number;
}
sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
cmp_map, NULL);
nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
ndr_desc->nd_set = nd_set;
devm_kfree(dev, info);
return 0;
}
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,
@ -838,7 +924,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
struct nd_region_desc ndr_desc;
struct nvdimm_bus *nvdimm_bus;
struct resource res;
int count = 0;
int count = 0, rc;
if (spa->range_index == 0) {
dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
@ -857,7 +943,6 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
struct nd_mapping *nd_mapping;
int rc;
if (memdev->range_index != spa->range_index)
continue;
@ -875,6 +960,10 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
ndr_desc.nd_mapping = nd_mappings;
ndr_desc.num_mappings = count;
rc = acpi_nfit_init_interleave_set(acpi_desc, &ndr_desc, spa);
if (rc)
return rc;
nvdimm_bus = acpi_desc->nvdimm_bus;
if (nfit_spa_type(spa) == NFIT_SPA_PM) {
if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))