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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>
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
Show Stats 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);

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,

6
include/linux/memremap.h
View File

@ -123,8 +123,7 @@ struct dev_pagemap {
};
#ifdef CONFIG_ZONE_DEVICE
void *devm_memremap_pages(struct device *dev, struct resource *res,
struct percpu_ref *ref, struct vmem_altmap *altmap);
void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap);
struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
struct dev_pagemap *pgmap);
@ -134,8 +133,7 @@ void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns);
static inline bool is_zone_device_page(const struct page *page);
#else
static inline void *devm_memremap_pages(struct device *dev,
struct resource *res, struct percpu_ref *ref,
struct vmem_altmap *altmap)
struct dev_pagemap *pgmap)
{
/*
* Fail attempts to call devm_memremap_pages() without

51
kernel/memremap.c
View File

@ -275,9 +275,10 @@ static unsigned long pfn_end(struct dev_pagemap *pgmap)
#define for_each_device_pfn(pfn, map) \
for (pfn = pfn_first(map); pfn < pfn_end(map); pfn++)
static void devm_memremap_pages_release(struct device *dev, void *data)
static void devm_memremap_pages_release(void *data)
{
struct dev_pagemap *pgmap = data;
struct device *dev = pgmap->dev;
struct resource *res = &pgmap->res;
resource_size_t align_start, align_size;
unsigned long pfn;
@ -316,29 +317,34 @@ static struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
/**
* devm_memremap_pages - remap and provide memmap backing for the given resource
* @dev: hosting device for @res
* @res: "host memory" address range
* @ref: a live per-cpu reference count
* @altmap: optional descriptor for allocating the memmap from @res
* @pgmap: pointer to a struct dev_pgmap
*
* Notes:
* 1/ @ref must be 'live' on entry and 'dead' before devm_memunmap_pages() time
* (or devm release event). The expected order of events is that @ref has
* 1/ At a minimum the res, ref and type members of @pgmap must be initialized
* by the caller before passing it to this function
*
* 2/ The altmap field may optionally be initialized, in which case altmap_valid
* must be set to true
*
* 3/ pgmap.ref must be 'live' on entry and 'dead' before devm_memunmap_pages()
* time (or devm release event). The expected order of events is that ref has
* been through percpu_ref_kill() before devm_memremap_pages_release(). The
* wait for the completion of all references being dropped and
* percpu_ref_exit() must occur after devm_memremap_pages_release().
*
* 2/ @res is expected to be a host memory range that could feasibly be
* 4/ res is expected to be a host memory range that could feasibly be
* treated as a "System RAM" range, i.e. not a device mmio range, but
* this is not enforced.
*/
void *devm_memremap_pages(struct device *dev, struct resource *res,
struct percpu_ref *ref, struct vmem_altmap *altmap)
void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
resource_size_t align_start, align_size, align_end;
struct vmem_altmap *altmap = pgmap->altmap_valid ?
&pgmap->altmap : NULL;
unsigned long pfn, pgoff, order;
pgprot_t pgprot = PAGE_KERNEL;
struct dev_pagemap *pgmap;
int error, nid, is_ram, i = 0;
struct resource *res = &pgmap->res;
align_start = res->start & ~(SECTION_SIZE - 1);
align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
@ -355,27 +361,10 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
if (is_ram == REGION_INTERSECTS)
return __va(res->start);
if (!ref)
if (!pgmap->ref)
return ERR_PTR(-EINVAL);
pgmap = devres_alloc_node(devm_memremap_pages_release,
sizeof(*pgmap), GFP_KERNEL, dev_to_node(dev));
if (!pgmap)
return ERR_PTR(-ENOMEM);
memcpy(&pgmap->res, res, sizeof(*res));
pgmap->dev = dev;
if (altmap) {
memcpy(&pgmap->altmap, altmap, sizeof(*altmap));
pgmap->altmap_valid = true;
altmap = &pgmap->altmap;
}
pgmap->ref = ref;
pgmap->type = MEMORY_DEVICE_HOST;
pgmap->page_fault = NULL;
pgmap->page_free = NULL;
pgmap->data = NULL;
mutex_lock(&pgmap_lock);
error = 0;
@ -423,11 +412,13 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
*/
list_del(&page->lru);
page->pgmap = pgmap;
percpu_ref_get(ref);
percpu_ref_get(pgmap->ref);
if (!(++i % 1024))
cond_resched();
}
devres_add(dev, pgmap);
devm_add_action(dev, devm_memremap_pages_release, pgmap);
return __va(res->start);
err_add_memory:

7
tools/testing/nvdimm/test/iomap.c
View File

@ -104,15 +104,14 @@ void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
}
EXPORT_SYMBOL(__wrap_devm_memremap);
void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res,
struct percpu_ref *ref, struct vmem_altmap *altmap)
void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
resource_size_t offset = res->start;
resource_size_t offset = pgmap->res.start;
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (nfit_res)
return nfit_res->buf + offset - nfit_res->res.start;
return devm_memremap_pages(dev, res, ref, altmap);
return devm_memremap_pages(dev, pgmap);
}
EXPORT_SYMBOL(__wrap_devm_memremap_pages);