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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 <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-12-29 08:54:05 +01:00 • committed by Dan Williams
commit e8d5134833
8 changed files with 77 additions and 81 deletions
Download patch file Download diff file Expand all files Collapse all files

9
drivers/nvdimm/nd.h
View file

@ -368,15 +368,14 @@ unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct badblocks *bb, const struct resource *res);
#if IS_ENABLED(CONFIG_ND_CLAIM)
struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
struct resource *res, struct vmem_altmap *altmap);
int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
#else
static inline struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
struct resource *res, struct vmem_altmap *altmap)
static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
struct dev_pagemap *pgmap)
{
return ERR_PTR(-ENXIO);
return -ENXIO;
}
static inline int devm_nsio_enable(struct device *dev,
struct nd_namespace_io *nsio)

27
drivers/nvdimm/pfn_devs.c
View file

@ -542,9 +542,10 @@ static unsigned long init_altmap_reserve(resource_size_t base)
return reserve;
}
static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
struct resource *res, struct vmem_altmap *altmap)
static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
{
struct resource *res = &pgmap->res;
struct vmem_altmap *altmap = &pgmap->altmap;
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = le64_to_cpu(pfn_sb->dataoff);
u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
@ -561,11 +562,13 @@ static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
res->start += start_pad;
res->end -= end_trunc;
pgmap->type = MEMORY_DEVICE_HOST;
if (nd_pfn->mode == PFN_MODE_RAM) {
if (offset < SZ_8K)
return ERR_PTR(-EINVAL);
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
altmap = NULL;
pgmap->altmap_valid = false;
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
nd_pfn->npfns = PFN_SECTION_ALIGN_UP((resource_size(res)
- offset) / PAGE_SIZE);
@ -577,10 +580,11 @@ static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
memcpy(altmap, &__altmap, sizeof(*altmap));
altmap->free = PHYS_PFN(offset - SZ_8K);
altmap->alloc = 0;
pgmap->altmap_valid = true;
} else
return ERR_PTR(-ENXIO);
return -ENXIO;
return altmap;
return 0;
}
static u64 phys_pmem_align_down(struct nd_pfn *nd_pfn, u64 phys)
@ -708,19 +712,18 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
* Determine the effective resource range and vmem_altmap from an nd_pfn
* instance.
*/
struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
struct resource *res, struct vmem_altmap *altmap)
int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
{
int rc;
if (!nd_pfn->uuid || !nd_pfn->ndns)
return ERR_PTR(-ENODEV);
return -ENODEV;
rc = nd_pfn_init(nd_pfn);
if (rc)
return ERR_PTR(rc);
return rc;
/* we need a valid pfn_sb before we can init a vmem_altmap */
return __nvdimm_setup_pfn(nd_pfn, res, altmap);
/* we need a valid pfn_sb before we can init a dev_pagemap */
return __nvdimm_setup_pfn(nd_pfn, pgmap);
}
EXPORT_SYMBOL_GPL(nvdimm_setup_pfn);

45
drivers/nvdimm/pmem.c
View file

@ -298,34 +298,34 @@ static int pmem_attach_disk(struct device *dev,
{
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct nd_region *nd_region = to_nd_region(dev->parent);
struct vmem_altmap __altmap, *altmap = NULL;
int nid = dev_to_node(dev), fua, wbc;
struct resource *res = &nsio->res;
struct resource bb_res;
struct nd_pfn *nd_pfn = NULL;
struct dax_device *dax_dev;
struct nd_pfn_sb *pfn_sb;
struct pmem_device *pmem;
struct resource pfn_res;
struct request_queue *q;
struct device *gendev;
struct gendisk *disk;
void *addr;
/* while nsio_rw_bytes is active, parse a pfn info block if present */
if (is_nd_pfn(dev)) {
nd_pfn = to_nd_pfn(dev);
altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap);
if (IS_ERR(altmap))
return PTR_ERR(altmap);
}
/* we're attaching a block device, disable raw namespace access */
devm_nsio_disable(dev, nsio);
int rc;
pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
if (!pmem)
return -ENOMEM;
/* while nsio_rw_bytes is active, parse a pfn info block if present */
if (is_nd_pfn(dev)) {
nd_pfn = to_nd_pfn(dev);
rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
if (rc)
return rc;
}
/* we're attaching a block device, disable raw namespace access */
devm_nsio_disable(dev, nsio);
dev_set_drvdata(dev, pmem);
pmem->phys_addr = res->start;
pmem->size = resource_size(res);
@ -350,19 +350,22 @@ static int pmem_attach_disk(struct device *dev,
return -ENOMEM;
pmem->pfn_flags = PFN_DEV;
pmem->pgmap.ref = &q->q_usage_counter;
if (is_nd_pfn(dev)) {
addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter,
altmap);
addr = devm_memremap_pages(dev, &pmem->pgmap);
pfn_sb = nd_pfn->pfn_sb;
pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
pmem->pfn_pad = resource_size(res) - resource_size(&pfn_res);
pmem->pfn_pad = resource_size(res) -
resource_size(&pmem->pgmap.res);
pmem->pfn_flags |= PFN_MAP;
res = &pfn_res; /* for badblocks populate */
res->start += pmem->data_offset;
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
bb_res.start += pmem->data_offset;
} else if (pmem_should_map_pages(dev)) {
addr = devm_memremap_pages(dev, &nsio->res,
&q->q_usage_counter, NULL);
memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res));
pmem->pgmap.altmap_valid = false;
addr = devm_memremap_pages(dev, &pmem->pgmap);
pmem->pfn_flags |= PFN_MAP;
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
} else
addr = devm_memremap(dev, pmem->phys_addr,
pmem->size, ARCH_MEMREMAP_PMEM);
@ -401,7 +404,7 @@ static int pmem_attach_disk(struct device *dev,
/ 512);
if (devm_init_badblocks(dev, &pmem->bb))
return -ENOMEM;
nvdimm_badblocks_populate(nd_region, &pmem->bb, res);
nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res);
disk->bb = &pmem->bb;
dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops);

1
drivers/nvdimm/pmem.h
View file

@ -22,6 +22,7 @@ struct pmem_device {
struct badblocks bb;
struct dax_device *dax_dev;
struct gendisk *disk;
struct dev_pagemap pgmap;
};
long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,