memremap: change devm_memremap_pages interface to use struct dev_pagemap
This new interface is similar to how struct device (and many others)
work. The caller initializes a 'struct dev_pagemap' as required
and calls 'devm_memremap_pages'. This allows the pagemap structure to
be embedded in another structure and thus container_of can be used. In
this way application specific members can be stored in a containing
struct.
This will be used by the P2P infrastructure and HMM could probably
be cleaned up to use it as well (instead of having it's own, similar
'hmm_devmem_pages_create' function).
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index 8d8c852..31b6ecc 100644
--- a/drivers/dax/pmem.c
+++ b/drivers/dax/pmem.c
@@ -21,6 +21,7 @@
struct dax_pmem {
struct device *dev;
struct percpu_ref ref;
+ struct dev_pagemap pgmap;
struct completion cmp;
};
@@ -69,20 +70,23 @@
struct nd_namespace_common *ndns;
struct nd_dax *nd_dax = to_nd_dax(dev);
struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
- struct vmem_altmap __altmap, *altmap = NULL;
ndns = nvdimm_namespace_common_probe(dev);
if (IS_ERR(ndns))
return PTR_ERR(ndns);
nsio = to_nd_namespace_io(&ndns->dev);
+ dax_pmem = devm_kzalloc(dev, sizeof(*dax_pmem), GFP_KERNEL);
+ if (!dax_pmem)
+ return -ENOMEM;
+
/* parse the 'pfn' info block via ->rw_bytes */
rc = devm_nsio_enable(dev, nsio);
if (rc)
return rc;
- altmap = nvdimm_setup_pfn(nd_pfn, &res, &__altmap);
- if (IS_ERR(altmap))
- return PTR_ERR(altmap);
+ rc = nvdimm_setup_pfn(nd_pfn, &dax_pmem->pgmap);
+ if (rc)
+ return rc;
devm_nsio_disable(dev, nsio);
pfn_sb = nd_pfn->pfn_sb;
@@ -94,10 +98,6 @@
return -EBUSY;
}
- dax_pmem = devm_kzalloc(dev, sizeof(*dax_pmem), GFP_KERNEL);
- if (!dax_pmem)
- return -ENOMEM;
-
dax_pmem->dev = dev;
init_completion(&dax_pmem->cmp);
rc = percpu_ref_init(&dax_pmem->ref, dax_pmem_percpu_release, 0,
@@ -110,7 +110,8 @@
if (rc)
return rc;
- addr = devm_memremap_pages(dev, &res, &dax_pmem->ref, altmap);
+ dax_pmem->pgmap.ref = &dax_pmem->ref;
+ addr = devm_memremap_pages(dev, &dax_pmem->pgmap);
if (IS_ERR(addr))
return PTR_ERR(addr);
@@ -120,6 +121,7 @@
return rc;
/* adjust the dax_region resource to the start of data */
+ memcpy(&res, &dax_pmem->pgmap.res, sizeof(res));
res.start += le64_to_cpu(pfn_sb->dataoff);
rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id);