提交 047fc8a1 编写于 作者: R Ross Zwisler 提交者: Dan Williams

libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory

The libnvdimm implementation handles allocating dimm address space (DPA)
between PMEM and BLK mode interfaces.  After DPA has been allocated from
a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O
as a struct bio based block device. Unlike PMEM, BLK is required to
handle platform specific details like mmio register formats and memory
controller interleave.  For this reason the libnvdimm generic nd_blk
driver calls back into the bus provider to carry out the I/O.

This initial implementation handles the BLK interface defined by the
ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from
DCR (dimm control region), BDW (block data window), IDT (interleave
descriptor) NFIT structures and the hardware register format.
[1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
[2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NRoss Zwisler <ross.zwisler@linux.intel.com>
Acked-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
上级 5212e11f
......@@ -13,12 +13,20 @@
#include <linux/list_sort.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/list.h>
#include <linux/acpi.h>
#include <linux/sort.h>
#include <linux/io.h>
#include "nfit.h"
/*
* For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
* irrelevant.
*/
#include <asm-generic/io-64-nonatomic-hi-lo.h>
static bool force_enable_dimms;
module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
......@@ -72,7 +80,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
if (!adev)
return -ENOTTY;
dimm_name = dev_name(&adev->dev);
dimm_name = nvdimm_name(nvdimm);
cmd_name = nvdimm_cmd_name(cmd);
dsm_mask = nfit_mem->dsm_mask;
desc = nd_cmd_dimm_desc(cmd);
......@@ -279,6 +287,23 @@ static bool add_bdw(struct acpi_nfit_desc *acpi_desc,
return true;
}
static bool add_idt(struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_interleave *idt)
{
struct device *dev = acpi_desc->dev;
struct nfit_idt *nfit_idt = devm_kzalloc(dev, sizeof(*nfit_idt),
GFP_KERNEL);
if (!nfit_idt)
return false;
INIT_LIST_HEAD(&nfit_idt->list);
nfit_idt->idt = idt;
list_add_tail(&nfit_idt->list, &acpi_desc->idts);
dev_dbg(dev, "%s: idt index: %d num_lines: %d\n", __func__,
idt->interleave_index, idt->line_count);
return true;
}
static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table,
const void *end)
{
......@@ -307,9 +332,9 @@ static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table,
if (!add_bdw(acpi_desc, table))
return err;
break;
/* TODO */
case ACPI_NFIT_TYPE_INTERLEAVE:
dev_dbg(dev, "%s: idt\n", __func__);
if (!add_idt(acpi_desc, table))
return err;
break;
case ACPI_NFIT_TYPE_FLUSH_ADDRESS:
dev_dbg(dev, "%s: flush\n", __func__);
......@@ -362,8 +387,11 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
{
u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
struct nfit_memdev *nfit_memdev;
struct nfit_dcr *nfit_dcr;
struct nfit_bdw *nfit_bdw;
struct nfit_idt *nfit_idt;
u16 idt_idx, range_index;
list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
if (nfit_dcr->dcr->region_index != dcr)
......@@ -396,6 +424,26 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
return 0;
nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
if (!nfit_mem->spa_bdw)
return 0;
range_index = nfit_mem->spa_bdw->range_index;
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
if (nfit_memdev->memdev->range_index != range_index ||
nfit_memdev->memdev->region_index != dcr)
continue;
nfit_mem->memdev_bdw = nfit_memdev->memdev;
idt_idx = nfit_memdev->memdev->interleave_index;
list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
if (nfit_idt->idt->interleave_index != idt_idx)
continue;
nfit_mem->idt_bdw = nfit_idt->idt;
break;
}
break;
}
return 0;
}
......@@ -439,9 +487,19 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
}
if (type == NFIT_SPA_DCR) {
struct nfit_idt *nfit_idt;
u16 idt_idx;
/* multiple dimms may share a SPA when interleaved */
nfit_mem->spa_dcr = spa;
nfit_mem->memdev_dcr = nfit_memdev->memdev;
idt_idx = nfit_memdev->memdev->interleave_index;
list_for_each_entry(nfit_idt, &acpi_desc->idts, list) {
if (nfit_idt->idt->interleave_index != idt_idx)
continue;
nfit_mem->idt_dcr = nfit_idt->idt;
break;
}
} else {
/*
* A single dimm may belong to multiple SPA-PM
......@@ -871,6 +929,359 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
return 0;
}
static u64 to_interleave_offset(u64 offset, struct nfit_blk_mmio *mmio)
{
struct acpi_nfit_interleave *idt = mmio->idt;
u32 sub_line_offset, line_index, line_offset;
u64 line_no, table_skip_count, table_offset;
line_no = div_u64_rem(offset, mmio->line_size, &sub_line_offset);
table_skip_count = div_u64_rem(line_no, mmio->num_lines, &line_index);
line_offset = idt->line_offset[line_index]
* mmio->line_size;
table_offset = table_skip_count * mmio->table_size;
return mmio->base_offset + line_offset + table_offset + sub_line_offset;
}
static u64 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
{
struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
u64 offset = nfit_blk->stat_offset + mmio->size * bw;
if (mmio->num_lines)
offset = to_interleave_offset(offset, mmio);
return readq(mmio->base + offset);
}
static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
resource_size_t dpa, unsigned int len, unsigned int write)
{
u64 cmd, offset;
struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
enum {
BCW_OFFSET_MASK = (1ULL << 48)-1,
BCW_LEN_SHIFT = 48,
BCW_LEN_MASK = (1ULL << 8) - 1,
BCW_CMD_SHIFT = 56,
};
cmd = (dpa >> L1_CACHE_SHIFT) & BCW_OFFSET_MASK;
len = len >> L1_CACHE_SHIFT;
cmd |= ((u64) len & BCW_LEN_MASK) << BCW_LEN_SHIFT;
cmd |= ((u64) write) << BCW_CMD_SHIFT;
offset = nfit_blk->cmd_offset + mmio->size * bw;
if (mmio->num_lines)
offset = to_interleave_offset(offset, mmio);
writeq(cmd, mmio->base + offset);
/* FIXME: conditionally perform read-back if mandated by firmware */
}
static int acpi_nfit_blk_single_io(struct nfit_blk *nfit_blk,
resource_size_t dpa, void *iobuf, size_t len, int rw,
unsigned int lane)
{
struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
unsigned int copied = 0;
u64 base_offset;
int rc;
base_offset = nfit_blk->bdw_offset + dpa % L1_CACHE_BYTES
+ lane * mmio->size;
/* TODO: non-temporal access, flush hints, cache management etc... */
write_blk_ctl(nfit_blk, lane, dpa, len, rw);
while (len) {
unsigned int c;
u64 offset;
if (mmio->num_lines) {
u32 line_offset;
offset = to_interleave_offset(base_offset + copied,
mmio);
div_u64_rem(offset, mmio->line_size, &line_offset);
c = min_t(size_t, len, mmio->line_size - line_offset);
} else {
offset = base_offset + nfit_blk->bdw_offset;
c = len;
}
if (rw)
memcpy(mmio->aperture + offset, iobuf + copied, c);
else
memcpy(iobuf + copied, mmio->aperture + offset, c);
copied += c;
len -= c;
}
rc = read_blk_stat(nfit_blk, lane) ? -EIO : 0;
return rc;
}
static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
resource_size_t dpa, void *iobuf, u64 len, int rw)
{
struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
struct nd_region *nd_region = nfit_blk->nd_region;
unsigned int lane, copied = 0;
int rc = 0;
lane = nd_region_acquire_lane(nd_region);
while (len) {
u64 c = min(len, mmio->size);
rc = acpi_nfit_blk_single_io(nfit_blk, dpa + copied,
iobuf + copied, c, rw, lane);
if (rc)
break;
copied += c;
len -= c;
}
nd_region_release_lane(nd_region, lane);
return rc;
}
static void nfit_spa_mapping_release(struct kref *kref)
{
struct nfit_spa_mapping *spa_map = to_spa_map(kref);
struct acpi_nfit_system_address *spa = spa_map->spa;
struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
iounmap(spa_map->iomem);
release_mem_region(spa->address, spa->length);
list_del(&spa_map->list);
kfree(spa_map);
}
static struct nfit_spa_mapping *find_spa_mapping(
struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_system_address *spa)
{
struct nfit_spa_mapping *spa_map;
WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
if (spa_map->spa == spa)
return spa_map;
return NULL;
}
static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_system_address *spa)
{
struct nfit_spa_mapping *spa_map;
mutex_lock(&acpi_desc->spa_map_mutex);
spa_map = find_spa_mapping(acpi_desc, spa);
if (spa_map)
kref_put(&spa_map->kref, nfit_spa_mapping_release);
mutex_unlock(&acpi_desc->spa_map_mutex);
}
static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_system_address *spa)
{
resource_size_t start = spa->address;
resource_size_t n = spa->length;
struct nfit_spa_mapping *spa_map;
struct resource *res;
WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
spa_map = find_spa_mapping(acpi_desc, spa);
if (spa_map) {
kref_get(&spa_map->kref);
return spa_map->iomem;
}
spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
if (!spa_map)
return NULL;
INIT_LIST_HEAD(&spa_map->list);
spa_map->spa = spa;
kref_init(&spa_map->kref);
spa_map->acpi_desc = acpi_desc;
res = request_mem_region(start, n, dev_name(acpi_desc->dev));
if (!res)
goto err_mem;
/* TODO: cacheability based on the spa type */
spa_map->iomem = ioremap_nocache(start, n);
if (!spa_map->iomem)
goto err_map;
list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
return spa_map->iomem;
err_map:
release_mem_region(start, n);
err_mem:
kfree(spa_map);
return NULL;
}
/**
* nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
* @nvdimm_bus: NFIT-bus that provided the spa table entry
* @nfit_spa: spa table to map
*
* In the case where block-data-window apertures and
* dimm-control-regions are interleaved they will end up sharing a
* single request_mem_region() + ioremap() for the address range. In
* the style of devm nfit_spa_map() mappings are automatically dropped
* when all region devices referencing the same mapping are disabled /
* unbound.
*/
static void __iomem *nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
struct acpi_nfit_system_address *spa)
{
void __iomem *iomem;
mutex_lock(&acpi_desc->spa_map_mutex);
iomem = __nfit_spa_map(acpi_desc, spa);
mutex_unlock(&acpi_desc->spa_map_mutex);
return iomem;
}
static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
struct acpi_nfit_interleave *idt, u16 interleave_ways)
{
if (idt) {
mmio->num_lines = idt->line_count;
mmio->line_size = idt->line_size;
if (interleave_ways == 0)
return -ENXIO;
mmio->table_size = mmio->num_lines * interleave_ways
* mmio->line_size;
}
return 0;
}
static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
struct device *dev)
{
struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
struct nd_blk_region *ndbr = to_nd_blk_region(dev);
struct nfit_blk_mmio *mmio;
struct nfit_blk *nfit_blk;
struct nfit_mem *nfit_mem;
struct nvdimm *nvdimm;
int rc;
nvdimm = nd_blk_region_to_dimm(ndbr);
nfit_mem = nvdimm_provider_data(nvdimm);
if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
nfit_mem ? "" : " nfit_mem",
nfit_mem->dcr ? "" : " dcr",
nfit_mem->bdw ? "" : " bdw");
return -ENXIO;
}
nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
if (!nfit_blk)
return -ENOMEM;
nd_blk_region_set_provider_data(ndbr, nfit_blk);
nfit_blk->nd_region = to_nd_region(dev);
/* map block aperture memory */
nfit_blk->bdw_offset = nfit_mem->bdw->offset;
mmio = &nfit_blk->mmio[BDW];
mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_bdw);
if (!mmio->base) {
dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
nvdimm_name(nvdimm));
return -ENOMEM;
}
mmio->size = nfit_mem->bdw->size;
mmio->base_offset = nfit_mem->memdev_bdw->region_offset;
mmio->idt = nfit_mem->idt_bdw;
mmio->spa = nfit_mem->spa_bdw;
rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_bdw,
nfit_mem->memdev_bdw->interleave_ways);
if (rc) {
dev_dbg(dev, "%s: %s failed to init bdw interleave\n",
__func__, nvdimm_name(nvdimm));
return rc;
}
/* map block control memory */
nfit_blk->cmd_offset = nfit_mem->dcr->command_offset;
nfit_blk->stat_offset = nfit_mem->dcr->status_offset;
mmio = &nfit_blk->mmio[DCR];
mmio->base = nfit_spa_map(acpi_desc, nfit_mem->spa_dcr);
if (!mmio->base) {
dev_dbg(dev, "%s: %s failed to map dcr\n", __func__,
nvdimm_name(nvdimm));
return -ENOMEM;
}
mmio->size = nfit_mem->dcr->window_size;
mmio->base_offset = nfit_mem->memdev_dcr->region_offset;
mmio->idt = nfit_mem->idt_dcr;
mmio->spa = nfit_mem->spa_dcr;
rc = nfit_blk_init_interleave(mmio, nfit_mem->idt_dcr,
nfit_mem->memdev_dcr->interleave_ways);
if (rc) {
dev_dbg(dev, "%s: %s failed to init dcr interleave\n",
__func__, nvdimm_name(nvdimm));
return rc;
}
if (mmio->line_size == 0)
return 0;
if ((u32) nfit_blk->cmd_offset % mmio->line_size
+ 8 > mmio->line_size) {
dev_dbg(dev, "cmd_offset crosses interleave boundary\n");
return -ENXIO;
} else if ((u32) nfit_blk->stat_offset % mmio->line_size
+ 8 > mmio->line_size) {
dev_dbg(dev, "stat_offset crosses interleave boundary\n");
return -ENXIO;
}
return 0;
}
static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
struct device *dev)
{
struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
struct nd_blk_region *ndbr = to_nd_blk_region(dev);
struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
int i;
if (!nfit_blk)
return; /* never enabled */
/* auto-free BLK spa mappings */
for (i = 0; i < 2; i++) {
struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
if (mmio->base)
nfit_spa_unmap(acpi_desc, mmio->spa);
}
nd_blk_region_set_provider_data(ndbr, NULL);
/* devm will free nfit_blk */
}
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,
......@@ -878,6 +1289,7 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
{
struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc,
memdev->device_handle);
struct nd_blk_region_desc *ndbr_desc;
struct nfit_mem *nfit_mem;
int blk_valid = 0;
......@@ -908,6 +1320,10 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
ndr_desc->nd_mapping = nd_mapping;
ndr_desc->num_mappings = blk_valid;
ndbr_desc = to_blk_region_desc(ndr_desc);
ndbr_desc->enable = acpi_nfit_blk_region_enable;
ndbr_desc->disable = acpi_nfit_blk_region_disable;
ndbr_desc->do_io = acpi_nfit_blk_region_do_io;
if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc))
return -ENOMEM;
break;
......@@ -921,8 +1337,9 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
{
static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS];
struct acpi_nfit_system_address *spa = nfit_spa->spa;
struct nd_blk_region_desc ndbr_desc;
struct nd_region_desc *ndr_desc;
struct nfit_memdev *nfit_memdev;
struct nd_region_desc ndr_desc;
struct nvdimm_bus *nvdimm_bus;
struct resource res;
int count = 0, rc;
......@@ -935,12 +1352,13 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
memset(&res, 0, sizeof(res));
memset(&nd_mappings, 0, sizeof(nd_mappings));
memset(&ndr_desc, 0, sizeof(ndr_desc));
memset(&ndbr_desc, 0, sizeof(ndbr_desc));
res.start = spa->address;
res.end = res.start + spa->length - 1;
ndr_desc.res = &res;
ndr_desc.provider_data = nfit_spa;
ndr_desc.attr_groups = acpi_nfit_region_attribute_groups;
ndr_desc = &ndbr_desc.ndr_desc;
ndr_desc->res = &res;
ndr_desc->provider_data = nfit_spa;
ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
struct nd_mapping *nd_mapping;
......@@ -953,24 +1371,24 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
return -ENXIO;
}
nd_mapping = &nd_mappings[count++];
rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, &ndr_desc,
rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, ndr_desc,
memdev, spa);
if (rc)
return rc;
}
ndr_desc.nd_mapping = nd_mappings;
ndr_desc.num_mappings = count;
rc = acpi_nfit_init_interleave_set(acpi_desc, &ndr_desc, spa);
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))
if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc))
return -ENOMEM;
} else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) {
if (!nvdimm_volatile_region_create(nvdimm_bus, &ndr_desc))
if (!nvdimm_volatile_region_create(nvdimm_bus, ndr_desc))
return -ENOMEM;
}
return 0;
......@@ -996,11 +1414,14 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
u8 *data;
int rc;
INIT_LIST_HEAD(&acpi_desc->spa_maps);
INIT_LIST_HEAD(&acpi_desc->spas);
INIT_LIST_HEAD(&acpi_desc->dcrs);
INIT_LIST_HEAD(&acpi_desc->bdws);
INIT_LIST_HEAD(&acpi_desc->idts);
INIT_LIST_HEAD(&acpi_desc->memdevs);
INIT_LIST_HEAD(&acpi_desc->dimms);
mutex_init(&acpi_desc->spa_map_mutex);
data = (u8 *) acpi_desc->nfit;
end = data + sz;
......
......@@ -52,6 +52,11 @@ struct nfit_bdw {
struct list_head list;
};
struct nfit_idt {
struct acpi_nfit_interleave *idt;
struct list_head list;
};
struct nfit_memdev {
struct acpi_nfit_memory_map *memdev;
struct list_head list;
......@@ -62,10 +67,13 @@ struct nfit_mem {
struct nvdimm *nvdimm;
struct acpi_nfit_memory_map *memdev_dcr;
struct acpi_nfit_memory_map *memdev_pmem;
struct acpi_nfit_memory_map *memdev_bdw;
struct acpi_nfit_control_region *dcr;
struct acpi_nfit_data_region *bdw;
struct acpi_nfit_system_address *spa_dcr;
struct acpi_nfit_system_address *spa_bdw;
struct acpi_nfit_interleave *idt_dcr;
struct acpi_nfit_interleave *idt_bdw;
struct list_head list;
struct acpi_device *adev;
unsigned long dsm_mask;
......@@ -74,16 +82,57 @@ struct nfit_mem {
struct acpi_nfit_desc {
struct nvdimm_bus_descriptor nd_desc;
struct acpi_table_nfit *nfit;
struct mutex spa_map_mutex;
struct list_head spa_maps;
struct list_head memdevs;
struct list_head dimms;
struct list_head spas;
struct list_head dcrs;
struct list_head bdws;
struct list_head idts;
struct nvdimm_bus *nvdimm_bus;
struct device *dev;
unsigned long dimm_dsm_force_en;
};
enum nd_blk_mmio_selector {
BDW,
DCR,
};
struct nfit_blk {
struct nfit_blk_mmio {
union {
void __iomem *base;
void *aperture;
};
u64 size;
u64 base_offset;
u32 line_size;
u32 num_lines;
u32 table_size;
struct acpi_nfit_interleave *idt;
struct acpi_nfit_system_address *spa;
} mmio[2];
struct nd_region *nd_region;
u64 bdw_offset; /* post interleave offset */
u64 stat_offset;
u64 cmd_offset;
};
struct nfit_spa_mapping {
struct acpi_nfit_desc *acpi_desc;
struct acpi_nfit_system_address *spa;
struct list_head list;
struct kref kref;
void __iomem *iomem;
};
static inline struct nfit_spa_mapping *to_spa_map(struct kref *kref)
{
return container_of(kref, struct nfit_spa_mapping, kref);
}
static inline struct acpi_nfit_memory_map *__to_nfit_memdev(
struct nfit_mem *nfit_mem)
{
......
......@@ -34,6 +34,19 @@ config BLK_DEV_PMEM
Say Y if you want to use an NVDIMM
config ND_BLK
tristate "BLK: Block data window (aperture) device support"
default LIBNVDIMM
select ND_BTT if BTT
help
Support NVDIMMs, or other devices, that implement a BLK-mode
access capability. BLK-mode access uses memory-mapped-i/o
apertures to access persistent media.
Say Y if your platform firmware emits an ACPI.NFIT table
(CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
capabilities.
config ND_BTT
tristate
......
obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o
obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
obj-$(CONFIG_ND_BTT) += nd_btt.o
obj-$(CONFIG_ND_BLK) += nd_blk.o
nd_pmem-y := pmem.o
nd_btt-y := btt.o
nd_blk-y := blk.o
libnvdimm-y := core.o
libnvdimm-y += bus.o
libnvdimm-y += dimm_devs.o
......
/*
* NVDIMM Block Window Driver
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/blkdev.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/nd.h>
#include <linux/sizes.h>
#include "nd.h"
struct nd_blk_device {
struct request_queue *queue;
struct gendisk *disk;
struct nd_namespace_blk *nsblk;
struct nd_blk_region *ndbr;
size_t disk_size;
};
static int nd_blk_major;
static resource_size_t to_dev_offset(struct nd_namespace_blk *nsblk,
resource_size_t ns_offset, unsigned int len)
{
int i;
for (i = 0; i < nsblk->num_resources; i++) {
if (ns_offset < resource_size(nsblk->res[i])) {
if (ns_offset + len > resource_size(nsblk->res[i])) {
dev_WARN_ONCE(&nsblk->common.dev, 1,
"illegal request\n");
return SIZE_MAX;
}
return nsblk->res[i]->start + ns_offset;
}
ns_offset -= resource_size(nsblk->res[i]);
}
dev_WARN_ONCE(&nsblk->common.dev, 1, "request out of range\n");
return SIZE_MAX;
}
static void nd_blk_make_request(struct request_queue *q, struct bio *bio)
{
struct block_device *bdev = bio->bi_bdev;
struct gendisk *disk = bdev->bd_disk;
struct nd_namespace_blk *nsblk;
struct nd_blk_device *blk_dev;
struct nd_blk_region *ndbr;
struct bvec_iter iter;
struct bio_vec bvec;
int err = 0, rw;
blk_dev = disk->private_data;
nsblk = blk_dev->nsblk;
ndbr = blk_dev->ndbr;
rw = bio_data_dir(bio);
bio_for_each_segment(bvec, bio, iter) {
unsigned int len = bvec.bv_len;
resource_size_t dev_offset;
void *iobuf;
BUG_ON(len > PAGE_SIZE);
dev_offset = to_dev_offset(nsblk,
iter.bi_sector << SECTOR_SHIFT, len);
if (dev_offset == SIZE_MAX) {
err = -EIO;
goto out;
}
iobuf = kmap_atomic(bvec.bv_page);
err = ndbr->do_io(ndbr, dev_offset, iobuf + bvec.bv_offset,
len, rw);
kunmap_atomic(iobuf);
if (err)
goto out;
}
out:
bio_endio(bio, err);
}
static int nd_blk_rw_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *iobuf, size_t n, int rw)
{
struct nd_blk_device *blk_dev = dev_get_drvdata(ndns->claim);
struct nd_namespace_blk *nsblk = blk_dev->nsblk;
struct nd_blk_region *ndbr = blk_dev->ndbr;
resource_size_t dev_offset;
dev_offset = to_dev_offset(nsblk, offset, n);
if (unlikely(offset + n > blk_dev->disk_size)) {
dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
return -EFAULT;
}
if (dev_offset == SIZE_MAX)
return -EIO;
return ndbr->do_io(ndbr, dev_offset, iobuf, n, rw);
}
static const struct block_device_operations nd_blk_fops = {
.owner = THIS_MODULE,
};
static int nd_blk_attach_disk(struct nd_namespace_common *ndns,
struct nd_blk_device *blk_dev)
{
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(&ndns->dev);
struct gendisk *disk;
blk_dev->queue = blk_alloc_queue(GFP_KERNEL);
if (!blk_dev->queue)
return -ENOMEM;
blk_queue_make_request(blk_dev->queue, nd_blk_make_request);
blk_queue_max_hw_sectors(blk_dev->queue, UINT_MAX);
blk_queue_bounce_limit(blk_dev->queue, BLK_BOUNCE_ANY);
blk_queue_logical_block_size(blk_dev->queue, nsblk->lbasize);
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, blk_dev->queue);
disk = blk_dev->disk = alloc_disk(0);
if (!disk) {
blk_cleanup_queue(blk_dev->queue);
return -ENOMEM;
}
disk->driverfs_dev = &ndns->dev;
disk->major = nd_blk_major;
disk->first_minor = 0;
disk->fops = &nd_blk_fops;
disk->private_data = blk_dev;
disk->queue = blk_dev->queue;
disk->flags = GENHD_FL_EXT_DEVT;
nvdimm_namespace_disk_name(ndns, disk->disk_name);
set_capacity(disk, blk_dev->disk_size >> SECTOR_SHIFT);
add_disk(disk);
return 0;
}
static int nd_blk_probe(struct device *dev)
{
struct nd_namespace_common *ndns;
struct nd_blk_device *blk_dev;
int rc;
ndns = nvdimm_namespace_common_probe(dev);
if (IS_ERR(ndns))
return PTR_ERR(ndns);
blk_dev = kzalloc(sizeof(*blk_dev), GFP_KERNEL);
if (!blk_dev)
return -ENOMEM;
blk_dev->disk_size = nvdimm_namespace_capacity(ndns);
blk_dev->ndbr = to_nd_blk_region(dev->parent);
blk_dev->nsblk = to_nd_namespace_blk(&ndns->dev);
dev_set_drvdata(dev, blk_dev);
ndns->rw_bytes = nd_blk_rw_bytes;
if (is_nd_btt(dev))
rc = nvdimm_namespace_attach_btt(ndns);
else if (nd_btt_probe(ndns, blk_dev) == 0) {
/* we'll come back as btt-blk */
rc = -ENXIO;
} else
rc = nd_blk_attach_disk(ndns, blk_dev);
if (rc)
kfree(blk_dev);
return rc;
}
static void nd_blk_detach_disk(struct nd_blk_device *blk_dev)
{
del_gendisk(blk_dev->disk);
put_disk(blk_dev->disk);
blk_cleanup_queue(blk_dev->queue);
}
static int nd_blk_remove(struct device *dev)
{
struct nd_blk_device *blk_dev = dev_get_drvdata(dev);
if (is_nd_btt(dev))
nvdimm_namespace_detach_btt(to_nd_btt(dev)->ndns);
else
nd_blk_detach_disk(blk_dev);
kfree(blk_dev);
return 0;
}
static struct nd_device_driver nd_blk_driver = {
.probe = nd_blk_probe,
.remove = nd_blk_remove,
.drv = {
.name = "nd_blk",
},
.type = ND_DRIVER_NAMESPACE_BLK,
};
static int __init nd_blk_init(void)
{
int rc;
rc = register_blkdev(0, "nd_blk");
if (rc < 0)
return rc;
nd_blk_major = rc;
rc = nd_driver_register(&nd_blk_driver);
if (rc < 0)
unregister_blkdev(nd_blk_major, "nd_blk");
return rc;
}
static void __exit nd_blk_exit(void)
{
driver_unregister(&nd_blk_driver.drv);
unregister_blkdev(nd_blk_major, "nd_blk");
}
MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_BLK);
module_init(nd_blk_init);
module_exit(nd_blk_exit);
......@@ -209,6 +209,15 @@ struct nvdimm *to_nvdimm(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nvdimm);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
{
struct nd_region *nd_region = &ndbr->nd_region;
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
return nd_mapping->nvdimm;
}
EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
{
struct nvdimm *nvdimm = nd_mapping->nvdimm;
......
......@@ -173,6 +173,65 @@ static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
return size;
}
static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
{
struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nd_label_id label_id;
struct resource *res;
int count, i;
if (!nsblk->uuid || !nsblk->lbasize || !ndd)
return false;
count = 0;
nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
for_each_dpa_resource(ndd, res) {
if (strcmp(res->name, label_id.id) != 0)
continue;
/*
* Resources with unacknoweldged adjustments indicate a
* failure to update labels
*/
if (res->flags & DPA_RESOURCE_ADJUSTED)
return false;
count++;
}
/* These values match after a successful label update */
if (count != nsblk->num_resources)
return false;
for (i = 0; i < nsblk->num_resources; i++) {
struct resource *found = NULL;
for_each_dpa_resource(ndd, res)
if (res == nsblk->res[i]) {
found = res;
break;
}
/* stale resource */
if (!found)
return false;
}
return true;
}
resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
{
resource_size_t size;
nvdimm_bus_lock(&nsblk->common.dev);
size = __nd_namespace_blk_validate(nsblk);
nvdimm_bus_unlock(&nsblk->common.dev);
return size;
}
EXPORT_SYMBOL(nd_namespace_blk_validate);
static int nd_namespace_label_update(struct nd_region *nd_region,
struct device *dev)
{
......@@ -1224,7 +1283,11 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
return ERR_PTR(-ENODEV);
}
} else if (is_namespace_blk(&ndns->dev)) {
return ERR_PTR(-ENODEV); /* TODO */
struct nd_namespace_blk *nsblk;
nsblk = to_nd_namespace_blk(&ndns->dev);
if (!nd_namespace_blk_validate(nsblk))
return ERR_PTR(-ENODEV);
}
return ndns;
......
......@@ -43,9 +43,8 @@ struct nvdimm {
};
bool is_nvdimm(struct device *dev);
bool is_nd_blk(struct device *dev);
bool is_nd_pmem(struct device *dev);
struct nd_btt;
bool is_nd_blk(struct device *dev);
struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
......
......@@ -102,6 +102,15 @@ struct nd_region {
struct nd_mapping mapping[0];
};
struct nd_blk_region {
int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
void *iobuf, u64 len, int rw);
void *blk_provider_data;
struct nd_region nd_region;
};
/*
* Lookup next in the repeating sequence of 01, 10, and 11.
*/
......@@ -171,8 +180,6 @@ static inline struct device *nd_btt_create(struct nd_region *nd_region)
#endif
struct nd_region *to_nd_region(struct device *dev);
unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
int nd_region_to_nstype(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
......@@ -192,4 +199,6 @@ int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
char *name);
int nd_blk_region_init(struct nd_region *nd_region);
resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
#endif /* __ND_H__ */
......@@ -18,11 +18,10 @@
static int nd_region_probe(struct device *dev)
{
int err;
int err, rc;
static unsigned long once;
struct nd_region_namespaces *num_ns;
struct nd_region *nd_region = to_nd_region(dev);
int rc = nd_region_register_namespaces(nd_region, &err);
if (nd_region->num_lanes > num_online_cpus()
&& nd_region->num_lanes < num_possible_cpus()
......@@ -34,6 +33,11 @@ static int nd_region_probe(struct device *dev)
nd_region->num_lanes);
}
rc = nd_blk_region_init(nd_region);
if (rc)
return rc;
rc = nd_region_register_namespaces(nd_region, &err);
num_ns = devm_kzalloc(dev, sizeof(*num_ns), GFP_KERNEL);
if (!num_ns)
return -ENOMEM;
......
......@@ -11,6 +11,7 @@
* General Public License for more details.
*/
#include <linux/scatterlist.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sort.h>
......@@ -34,7 +35,10 @@ static void nd_region_release(struct device *dev)
}
free_percpu(nd_region->lane);
ida_simple_remove(&region_ida, nd_region->id);
kfree(nd_region);
if (is_nd_blk(dev))
kfree(to_nd_blk_region(dev));
else
kfree(nd_region);
}
static struct device_type nd_blk_device_type = {
......@@ -71,6 +75,33 @@ struct nd_region *to_nd_region(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nd_region);
struct nd_blk_region *to_nd_blk_region(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev);
WARN_ON(!is_nd_blk(dev));
return container_of(nd_region, struct nd_blk_region, nd_region);
}
EXPORT_SYMBOL_GPL(to_nd_blk_region);
void *nd_region_provider_data(struct nd_region *nd_region)
{
return nd_region->provider_data;
}
EXPORT_SYMBOL_GPL(nd_region_provider_data);
void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
{
return ndbr->blk_provider_data;
}
EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
{
ndbr->blk_provider_data = data;
}
EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
/**
* nd_region_to_nstype() - region to an integer namespace type
* @nd_region: region-device to interrogate
......@@ -365,7 +396,8 @@ u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
/*
* Upon successful probe/remove, take/release a reference on the
* associated interleave set (if present), and plant new btt + namespace
* seeds.
* seeds. Also, on the removal of a BLK region, notify the provider to
* disable the region.
*/
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
struct device *dev, bool probe)
......@@ -385,8 +417,14 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
nd_mapping->labels = NULL;
put_ndd(ndd);
nd_mapping->ndd = NULL;
atomic_dec(&nvdimm->busy);
if (ndd)
atomic_dec(&nvdimm->busy);
}
if (is_nd_pmem(dev))
return;
to_nd_blk_region(dev)->disable(nvdimm_bus, dev);
}
if (dev->parent && is_nd_blk(dev->parent) && probe) {
nd_region = to_nd_region(dev->parent);
......@@ -526,11 +564,21 @@ struct attribute_group nd_mapping_attribute_group = {
};
EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
void *nd_region_provider_data(struct nd_region *nd_region)
int nd_blk_region_init(struct nd_region *nd_region)
{
return nd_region->provider_data;
struct device *dev = &nd_region->dev;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
if (!is_nd_blk(dev))
return 0;
if (nd_region->ndr_mappings < 1) {
dev_err(dev, "invalid BLK region\n");
return -ENXIO;
}
return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
}
EXPORT_SYMBOL_GPL(nd_region_provider_data);
/**
* nd_region_acquire_lane - allocate and lock a lane
......@@ -591,6 +639,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
{
struct nd_region *nd_region;
struct device *dev;
void *region_buf;
unsigned int i;
for (i = 0; i < ndr_desc->num_mappings; i++) {
......@@ -605,10 +654,30 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
}
}
nd_region = kzalloc(sizeof(struct nd_region)
+ sizeof(struct nd_mapping) * ndr_desc->num_mappings,
GFP_KERNEL);
if (!nd_region)
if (dev_type == &nd_blk_device_type) {
struct nd_blk_region_desc *ndbr_desc;
struct nd_blk_region *ndbr;
ndbr_desc = to_blk_region_desc(ndr_desc);
ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
* ndr_desc->num_mappings,
GFP_KERNEL);
if (ndbr) {
nd_region = &ndbr->nd_region;
ndbr->enable = ndbr_desc->enable;
ndbr->disable = ndbr_desc->disable;
ndbr->do_io = ndbr_desc->do_io;
}
region_buf = ndbr;
} else {
nd_region = kzalloc(sizeof(struct nd_region)
+ sizeof(struct nd_mapping)
* ndr_desc->num_mappings,
GFP_KERNEL);
region_buf = nd_region;
}
if (!region_buf)
return NULL;
nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
if (nd_region->id < 0)
......@@ -654,7 +723,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
err_percpu:
ida_simple_remove(&region_ida, nd_region->id);
err_id:
kfree(nd_region);
kfree(region_buf);
return NULL;
}
......
......@@ -14,6 +14,7 @@
*/
#ifndef __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/types.h>
......@@ -89,8 +90,24 @@ struct nd_region_desc {
};
struct nvdimm_bus;
struct device;
struct module;
struct device;
struct nd_blk_region;
struct nd_blk_region_desc {
int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
void *iobuf, u64 len, int rw);
struct nd_region_desc ndr_desc;
};
static inline struct nd_blk_region_desc *to_blk_region_desc(
struct nd_region_desc *ndr_desc)
{
return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
}
struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
#define nvdimm_bus_register(parent, desc) \
......@@ -99,10 +116,10 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm *to_nvdimm(struct device *dev);
struct nd_region *to_nd_region(struct device *dev);
struct nd_blk_region *to_nd_blk_region(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
void *nd_region_provider_data(struct nd_region *nd_region);
struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
const struct attribute_group **groups, unsigned long flags,
unsigned long *dsm_mask);
......@@ -120,5 +137,11 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
void *nd_region_provider_data(struct nd_region *nd_region);
void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
u64 nd_fletcher64(void *addr, size_t len, bool le);
#endif /* __LIBNVDIMM_H__ */
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