Use the new vmem_altmap capability to enable the pmem driver to arrange
for a struct page memmap to be established in persistent memory.
Cc: Christoph Hellwig <h...@lst.de>
Cc: Dave Chinner <da...@fromorbit.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Ross Zwisler <ross.zwis...@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
drivers/nvdimm/pfn_devs.c | 3 +--
drivers/nvdimm/pmem.c | 19 +++++++++++++++++--
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 71805a1aa0f3..a642cfacee07 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -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;
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 3c5b8f585441..bb66158c0505 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -322,12 +322,16 @@ 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;
@@ -355,6 +359,17 @@ 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;
@@ -364,7 +379,7 @@ 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);
if (IS_ERR(pmem->virt_addr)) {
rc = PTR_ERR(pmem->virt_addr);
goto err;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
