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

memremap: change devm_memremap_pages interface to use struct dev_pagemap

Browse Source 
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>
This commit is contained in:
Christoph Hellwig
2017-12-29 08:54:05 +01:00
committed by Dan Williams
parent e7744aa25c
commit e8d5134833
8 changed files with 81 additions and 85 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/dax/pmem.c
View File

@@ -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 @@ static int dax_pmem_probe(struct device *dev)
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 @@ static int dax_pmem_probe(struct device *dev)
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 @@ static int dax_pmem_probe(struct device *dev)
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 @@ static int dax_pmem_probe(struct device *dev)
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", &region_id, &id);