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libnvdimm, pfn, pmem: allocate memmap array in persistent memory

Browse source 
Use the new vmem_altmap capability to enable the pmem driver to arrange
for a struct page memmap to be established in persistent memory.

[[email protected]: mn10300: declare __pfn_to_phys() to fix build error]
Signed-off-by: Dan Williams <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Ross Zwisler <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Williams 2016-01-15 16:56:26 -08:00 • committed by Linus Torvalds
commit d2c0f041e1
4 changed files with 20 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/nvdimm/pfn_devs.c
View file

@ -83,8 +83,7 @@ static ssize_t mode_store(struct device *dev,
if (strncmp(buf, "pmem\n", n) == 0
|| strncmp(buf, "pmem", n) == 0) {
/* TODO: allocate from PMEM support */
rc = -ENOTTY;
nd_pfn->mode = PFN_MODE_PMEM;
} else if (strncmp(buf, "ram\n", n) == 0
|| strncmp(buf, "ram", n) == 0)
nd_pfn->mode = PFN_MODE_RAM;

19
drivers/nvdimm/pmem.c
View file

@ -357,12 +357,16 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
struct device *dev = &nd_pfn->dev;
struct vmem_altmap *altmap;
struct nd_region *nd_region;
struct vmem_altmap *altmap;
struct nd_pfn_sb *pfn_sb;
struct pmem_device *pmem;
phys_addr_t offset;
int rc;
struct vmem_altmap __altmap = {
.base_pfn = __phys_to_pfn(nsio->res.start),
.reserve = __phys_to_pfn(SZ_8K),
};
if (!nd_pfn->uuid || !nd_pfn->ndns)
return -ENODEV;
@ -380,6 +384,17 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
altmap = NULL;
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
nd_pfn->npfns = (resource_size(&nsio->res) - offset)
/ PAGE_SIZE;
if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
dev_info(&nd_pfn->dev,
"number of pfns truncated from %lld to %ld\n",
le64_to_cpu(nd_pfn->pfn_sb->npfns),
nd_pfn->npfns);
altmap = & __altmap;
altmap->free = __phys_to_pfn(offset - SZ_8K);
altmap->alloc = 0;
} else {
rc = -ENXIO;
goto err;
@ -389,7 +404,7 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
pmem = dev_get_drvdata(dev);
devm_memunmap(dev, (void __force *) pmem->virt_addr);
pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &nsio->res,
NULL);
altmap);
pmem->pfn_flags |= PFN_MAP;
if (IS_ERR(pmem->virt_addr)) {
rc = PTR_ERR(pmem->virt_addr);