xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

libnvdimm, pmem: 'struct page' for pmem

Browse Source 
Enable the pmem driver to handle PFN device instances.  Attaching a pmem
namespace to a pfn device triggers the driver to allocate and initialize
struct page entries for pmem.  Memory capacity for this allocation comes
exclusively from RAM for now which is suitable for low PMEM to RAM
ratios.  This mechanism will be expanded later for setting an "allocate
from PMEM" policy.

Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2015-08-01 02:16:37 -04:00
parent e1455744b2
commit 32ab0a3f51
6 changed files with 215 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/nvdimm/pfn_devs.c
View File

@@ -228,7 +228,7 @@ struct device *nd_pfn_create(struct nd_region *nd_region)
return dev;
}
static int nd_pfn_validate(struct nd_pfn *nd_pfn)
int nd_pfn_validate(struct nd_pfn *nd_pfn)
{
struct nd_namespace_common *ndns = nd_pfn->ndns;
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
@@ -286,10 +286,10 @@ static int nd_pfn_validate(struct nd_pfn *nd_pfn)
*/
offset = le64_to_cpu(pfn_sb->dataoff);
nsio = to_nd_namespace_io(&ndns->dev);
if ((nsio->res.start + offset) & (ND_PFN_ALIGN - 1)) {
if (nsio->res.start & ND_PFN_MASK) {
dev_err(&nd_pfn->dev,
"init failed: %s with offset %#llx not section aligned\n",
dev_name(&ndns->dev), offset);
"init failed: %s not section aligned\n",
dev_name(&ndns->dev));
return -EBUSY;
} else if (offset >= resource_size(&nsio->res)) {
dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
@@ -299,6 +299,7 @@ static int nd_pfn_validate(struct nd_pfn *nd_pfn)
return 0;
}
EXPORT_SYMBOL(nd_pfn_validate);
int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
{