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mm/memremap_pages: convert to 'struct range'

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The 'struct resource' in 'struct dev_pagemap' is only used for holding
resource span information.  The other fields, 'name', 'flags', 'desc',
'parent', 'sibling', and 'child' are all unused wasted space.

This is in preparation for introducing a multi-range extension of
devm_memremap_pages().

The bulk of this change is unwinding all the places internal to libnvdimm
that used 'struct resource' unnecessarily, and replacing instances of
'struct dev_pagemap'.res with 'struct dev_pagemap'.range.

P2PDMA had a minor usage of the resource flags field, but only to report
failures with "%pR".  That is replaced with an open coded print of the
range.

[dan.carpenter@oracle.com: mm/hmm/test: use after free in dmirror_allocate_chunk()]
  Link: https://lkml.kernel.org/r/20200926121402.GA7467@kadam

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>	[xen]
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/159643103173.4062302.768998885691711532.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/160106115761.30709.13539840236873663620.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2020-10-13 16:50:29 -07:00 committed by Linus Torvalds
parent fcffb6a1df
commit a4574f63ed
21 changed files with 195 additions and 165 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/powerpc/kvm/book3s_hv_uvmem.c
View File

@ -687,9 +687,9 @@ static struct page *kvmppc_uvmem_get_page(unsigned long gpa, struct kvm *kvm)
struct kvmppc_uvmem_page_pvt *pvt;
unsigned long pfn_last, pfn_first;
pfn_first = kvmppc_uvmem_pgmap.res.start >> PAGE_SHIFT;
pfn_first = kvmppc_uvmem_pgmap.range.start >> PAGE_SHIFT;
pfn_last = pfn_first +
(resource_size(&kvmppc_uvmem_pgmap.res) >> PAGE_SHIFT);
(range_len(&kvmppc_uvmem_pgmap.range) >> PAGE_SHIFT);
spin_lock(&kvmppc_uvmem_bitmap_lock);
bit = find_first_zero_bit(kvmppc_uvmem_bitmap,
@ -1007,7 +1007,7 @@ static vm_fault_t kvmppc_uvmem_migrate_to_ram(struct vm_fault *vmf)
static void kvmppc_uvmem_page_free(struct page *page)
{
unsigned long pfn = page_to_pfn(page) -
(kvmppc_uvmem_pgmap.res.start >> PAGE_SHIFT);
(kvmppc_uvmem_pgmap.range.start >> PAGE_SHIFT);
struct kvmppc_uvmem_page_pvt *pvt;
spin_lock(&kvmppc_uvmem_bitmap_lock);
@ -1170,7 +1170,8 @@ int kvmppc_uvmem_init(void)
}
kvmppc_uvmem_pgmap.type = MEMORY_DEVICE_PRIVATE;
kvmppc_uvmem_pgmap.res = *res;
kvmppc_uvmem_pgmap.range.start = res->start;
kvmppc_uvmem_pgmap.range.end = res->end;
kvmppc_uvmem_pgmap.ops = &kvmppc_uvmem_ops;
/* just one global instance: */
kvmppc_uvmem_pgmap.owner = &kvmppc_uvmem_pgmap;
@ -1205,7 +1206,7 @@ void kvmppc_uvmem_free(void)
return;
memunmap_pages(&kvmppc_uvmem_pgmap);
release_mem_region(kvmppc_uvmem_pgmap.res.start,
resource_size(&kvmppc_uvmem_pgmap.res));
release_mem_region(kvmppc_uvmem_pgmap.range.start,
range_len(&kvmppc_uvmem_pgmap.range));
kfree(kvmppc_uvmem_bitmap);
}

10
drivers/dax/bus.c
View File

@ -515,7 +515,7 @@ static void dax_region_unregister(void *region)
}
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
struct resource *res, int target_node, unsigned int align,
struct range *range, int target_node, unsigned int align,
unsigned long flags)
{
struct dax_region *dax_region;
@ -530,8 +530,8 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
return NULL;
}
if (!IS_ALIGNED(res->start, align)
|| !IS_ALIGNED(resource_size(res), align))
if (!IS_ALIGNED(range->start, align)
|| !IS_ALIGNED(range_len(range), align))
return NULL;
dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL);
@ -546,8 +546,8 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
dax_region->target_node = target_node;
ida_init(&dax_region->ida);
dax_region->res = (struct resource) {
.start = res->start,
.end = res->end,
.start = range->start,
.end = range->end,
.flags = IORESOURCE_MEM | flags,
};

2
drivers/dax/bus.h
View File

@ -13,7 +13,7 @@ void dax_region_put(struct dax_region *dax_region);
#define IORESOURCE_DAX_STATIC (1UL << 0)
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
struct resource *res, int target_node, unsigned int align,
struct range *range, int target_node, unsigned int align,
unsigned long flags);
enum dev_dax_subsys {

5
drivers/dax/dax-private.h
View File

@ -61,11 +61,6 @@ struct dev_dax {
struct range range;
};
static inline u64 range_len(struct range *range)
{
return range->end - range->start + 1;
}
static inline struct dev_dax *to_dev_dax(struct device *dev)
{
return container_of(dev, struct dev_dax, dev);

3
drivers/dax/device.c
View File

@ -416,8 +416,7 @@ int dev_dax_probe(struct dev_dax *dev_dax)
pgmap = devm_kzalloc(dev, sizeof(*pgmap), GFP_KERNEL);
if (!pgmap)
return -ENOMEM;
pgmap->res.start = range->start;
pgmap->res.end = range->end;
pgmap->range = *range;
}
pgmap->type = MEMORY_DEVICE_GENERIC;
addr = devm_memremap_pages(dev, pgmap);

5
drivers/dax/hmem/hmem.c
View File

@ -13,13 +13,16 @@ static int dax_hmem_probe(struct platform_device *pdev)
struct dev_dax_data data;
struct dev_dax *dev_dax;
struct resource *res;
struct range range;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
mri = dev->platform_data;
dax_region = alloc_dax_region(dev, pdev->id, res, mri->target_node,
range.start = res->start;
range.end = res->end;
dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node,
PMD_SIZE, 0);
if (!dax_region)
return -ENOMEM;

12
drivers/dax/pmem/core.c
View File

@ -9,7 +9,7 @@
struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys)
{
struct resource res;
struct range range;
int rc, id, region_id;
resource_size_t offset;
struct nd_pfn_sb *pfn_sb;
@ -50,10 +50,10 @@ struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys)
if (rc != 2)
return ERR_PTR(-EINVAL);
/* adjust the dax_region resource to the start of data */
memcpy(&res, &pgmap.res, sizeof(res));
res.start += offset;
dax_region = alloc_dax_region(dev, region_id, &res,
/* adjust the dax_region range to the start of data */
range = pgmap.range;
range.start += offset,
dax_region = alloc_dax_region(dev, region_id, &range,
nd_region->target_node, le32_to_cpu(pfn_sb->align),
IORESOURCE_DAX_STATIC);
if (!dax_region)
@ -64,7 +64,7 @@ struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys)
.id = id,
.pgmap = &pgmap,
.subsys = subsys,
.size = resource_size(&res),
.size = range_len(&range),
};
dev_dax = devm_create_dev_dax(&data);

14
drivers/gpu/drm/nouveau/nouveau_dmem.c
View File

@ -101,7 +101,7 @@ unsigned long nouveau_dmem_page_addr(struct page *page)
{
struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
unsigned long off = (page_to_pfn(page) << PAGE_SHIFT) -
chunk->pagemap.res.start;
chunk->pagemap.range.start;
return chunk->bo->offset + off;
}
@ -249,7 +249,8 @@ nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage)
chunk->drm = drm;
chunk->pagemap.type = MEMORY_DEVICE_PRIVATE;
chunk->pagemap.res = *res;
chunk->pagemap.range.start = res->start;
chunk->pagemap.range.end = res->end;
chunk->pagemap.ops = &nouveau_dmem_pagemap_ops;
chunk->pagemap.owner = drm->dev;
@ -273,7 +274,7 @@ nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage)
list_add(&chunk->list, &drm->dmem->chunks);
mutex_unlock(&drm->dmem->mutex);
pfn_first = chunk->pagemap.res.start >> PAGE_SHIFT;
pfn_first = chunk->pagemap.range.start >> PAGE_SHIFT;
page = pfn_to_page(pfn_first);
spin_lock(&drm->dmem->lock);
for (i = 0; i < DMEM_CHUNK_NPAGES - 1; ++i, ++page) {
@ -294,8 +295,7 @@ out_bo_unpin:
out_bo_free:
nouveau_bo_ref(NULL, &chunk->bo);
out_release:
release_mem_region(chunk->pagemap.res.start,
resource_size(&chunk->pagemap.res));
release_mem_region(chunk->pagemap.range.start, range_len(&chunk->pagemap.range));
out_free:
kfree(chunk);
out:
@ -382,8 +382,8 @@ nouveau_dmem_fini(struct nouveau_drm *drm)
nouveau_bo_ref(NULL, &chunk->bo);
list_del(&chunk->list);
memunmap_pages(&chunk->pagemap);
release_mem_region(chunk->pagemap.res.start,
resource_size(&chunk->pagemap.res));
release_mem_region(chunk->pagemap.range.start,
range_len(&chunk->pagemap.range));
kfree(chunk);
}

26
drivers/nvdimm/badrange.c
View File

@ -211,7 +211,7 @@ static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len)
}
static void badblocks_populate(struct badrange *badrange,
struct badblocks *bb, const struct resource *res)
struct badblocks *bb, const struct range *range)
{
struct badrange_entry *bre;
@ -222,34 +222,34 @@ static void badblocks_populate(struct badrange *badrange,
u64 bre_end = bre->start + bre->length - 1;
/* Discard intervals with no intersection */
if (bre_end < res->start)
if (bre_end < range->start)
continue;
if (bre->start > res->end)
if (bre->start > range->end)
continue;
/* Deal with any overlap after start of the namespace */
if (bre->start >= res->start) {
if (bre->start >= range->start) {
u64 start = bre->start;
u64 len;
if (bre_end <= res->end)
if (bre_end <= range->end)
len = bre->length;
else
len = res->start + resource_size(res)
len = range->start + range_len(range)
- bre->start;
__add_badblock_range(bb, start - res->start, len);
__add_badblock_range(bb, start - range->start, len);
continue;
}
/*
* Deal with overlap for badrange starting before
* the namespace.
*/
if (bre->start < res->start) {
if (bre->start < range->start) {
u64 len;
if (bre_end < res->end)
len = bre->start + bre->length - res->start;
if (bre_end < range->end)
len = bre->start + bre->length - range->start;
else
len = resource_size(res);
len = range_len(range);
__add_badblock_range(bb, 0, len);
}
}
@ -267,7 +267,7 @@ static void badblocks_populate(struct badrange *badrange,
* and add badblocks entries for all matching sub-ranges
*/
void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct badblocks *bb, const struct resource *res)
struct badblocks *bb, const struct range *range)
{
struct nvdimm_bus *nvdimm_bus;
@ -279,7 +279,7 @@ void nvdimm_badblocks_populate(struct nd_region *nd_region,
nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
nvdimm_bus_lock(&nvdimm_bus->dev);
badblocks_populate(&nvdimm_bus->badrange, bb, res);
badblocks_populate(&nvdimm_bus->badrange, bb, range);
nvdimm_bus_unlock(&nvdimm_bus->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_badblocks_populate);

13
drivers/nvdimm/claim.c
View File

@ -303,13 +303,16 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
resource_size_t size)
{
struct resource *res = &nsio->res;
struct nd_namespace_common *ndns = &nsio->common;
struct range range = {
.start = nsio->res.start,
.end = nsio->res.end,
};
nsio->size = size;
if (!devm_request_mem_region(dev, res->start, size,
if (!devm_request_mem_region(dev, range.start, size,
dev_name(&ndns->dev))) {
dev_warn(dev, "could not reserve region %pR\n", res);
dev_warn(dev, "could not reserve region %pR\n", &nsio->res);
return -EBUSY;
}
@ -317,9 +320,9 @@ int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio,
if (devm_init_badblocks(dev, &nsio->bb))
return -ENOMEM;
nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb,
&nsio->res);
&range);
nsio->addr = devm_memremap(dev, res->start, size, ARCH_MEMREMAP_PMEM);
nsio->addr = devm_memremap(dev, range.start, size, ARCH_MEMREMAP_PMEM);
return PTR_ERR_OR_ZERO(nsio->addr);
}

3
drivers/nvdimm/nd.h
View File

@ -377,8 +377,9 @@ int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
char *name);
unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
struct range;
void nvdimm_badblocks_populate(struct nd_region *nd_region,
struct badblocks *bb, const struct resource *res);
struct badblocks *bb, const struct range *range);
int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
resource_size_t size);
void devm_namespace_disable(struct device *dev,

12
drivers/nvdimm/pfn_devs.c
View File

@ -672,7 +672,7 @@ static unsigned long init_altmap_reserve(resource_size_t base)
static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
{
struct resource *res = &pgmap->res;
struct range *range = &pgmap->range;
struct vmem_altmap *altmap = &pgmap->altmap;
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
u64 offset = le64_to_cpu(pfn_sb->dataoff);
@ -689,16 +689,16 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
.end_pfn = PHYS_PFN(end),
};
memcpy(res, &nsio->res, sizeof(*res));
res->start += start_pad;
res->end -= end_trunc;
*range = (struct range) {
.start = nsio->res.start + start_pad,
.end = nsio->res.end - end_trunc,
};
if (nd_pfn->mode == PFN_MODE_RAM) {
if (offset < reserve)
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
nd_pfn->npfns = PHYS_PFN((resource_size(res) - offset));
nd_pfn->npfns = PHYS_PFN((range_len(range) - offset));
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",

26
drivers/nvdimm/pmem.c
View File

@ -375,7 +375,7 @@ static int pmem_attach_disk(struct device *dev,
struct nd_region *nd_region = to_nd_region(dev->parent);
int nid = dev_to_node(dev), fua;
struct resource *res = &nsio->res;
struct resource bb_res;
struct range bb_range;
struct nd_pfn *nd_pfn = NULL;
struct dax_device *dax_dev;
struct nd_pfn_sb *pfn_sb;
@ -434,24 +434,26 @@ static int pmem_attach_disk(struct device *dev,
pfn_sb = nd_pfn->pfn_sb;
pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
pmem->pfn_pad = resource_size(res) -
resource_size(&pmem->pgmap.res);
range_len(&pmem->pgmap.range);
pmem->pfn_flags |= PFN_MAP;
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
bb_res.start += pmem->data_offset;
bb_range = pmem->pgmap.range;
bb_range.start += pmem->data_offset;
} else if (pmem_should_map_pages(dev)) {
memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res));
pmem->pgmap.range.start = res->start;
pmem->pgmap.range.end = res->end;
pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
pmem->pgmap.ops = &fsdax_pagemap_ops;
addr = devm_memremap_pages(dev, &pmem->pgmap);
pmem->pfn_flags |= PFN_MAP;
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
bb_range = pmem->pgmap.range;
} else {
if (devm_add_action_or_reset(dev, pmem_release_queue,
&pmem->pgmap))
return -ENOMEM;
addr = devm_memremap(dev, pmem->phys_addr,
pmem->size, ARCH_MEMREMAP_PMEM);
memcpy(&bb_res, &nsio->res, sizeof(bb_res));
bb_range.start = res->start;
bb_range.end = res->end;
}
if (IS_ERR(addr))
@ -480,7 +482,7 @@ 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, &bb_res);
nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
disk->bb = &pmem->bb;
if (is_nvdimm_sync(nd_region))
@ -591,8 +593,8 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
resource_size_t offset = 0, end_trunc = 0;
struct nd_namespace_common *ndns;
struct nd_namespace_io *nsio;
struct resource res;
struct badblocks *bb;
struct range range;
struct kernfs_node *bb_state;
if (event != NVDIMM_REVALIDATE_POISON)
@ -628,9 +630,9 @@ static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
nsio = to_nd_namespace_io(&ndns->dev);
}
res.start = nsio->res.start + offset;
res.end = nsio->res.end - end_trunc;
nvdimm_badblocks_populate(nd_region, bb, &res);
range.start = nsio->res.start + offset;
range.end = nsio->res.end - end_trunc;
nvdimm_badblocks_populate(nd_region, bb, &range);
if (bb_state)
sysfs_notify_dirent(bb_state);
}

21
drivers/nvdimm/region.c
View File

@ -35,7 +35,10 @@ static int nd_region_probe(struct device *dev)
return rc;
if (is_memory(&nd_region->dev)) {
struct resource ndr_res;
struct range range = {
.start = nd_region->ndr_start,
.end = nd_region->ndr_start + nd_region->ndr_size - 1,
};
if (devm_init_badblocks(dev, &nd_region->bb))
return -ENODEV;
@ -44,9 +47,7 @@ static int nd_region_probe(struct device *dev)
if (!nd_region->bb_state)
dev_warn(&nd_region->dev,
"'badblocks' notification disabled\n");
ndr_res.start = nd_region->ndr_start;
ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1;
nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res);
nvdimm_badblocks_populate(nd_region, &nd_region->bb, &range);
}
rc = nd_region_register_namespaces(nd_region, &err);
@ -121,14 +122,16 @@ static void nd_region_notify(struct device *dev, enum nvdimm_event event)
{
if (event == NVDIMM_REVALIDATE_POISON) {
struct nd_region *nd_region = to_nd_region(dev);
struct resource res;
if (is_memory(&nd_region->dev)) {
res.start = nd_region->ndr_start;
res.end = nd_region->ndr_start +
nd_region->ndr_size - 1;
struct range range = {
.start = nd_region->ndr_start,
.end = nd_region->ndr_start +
nd_region->ndr_size - 1,
};
nvdimm_badblocks_populate(nd_region,
&nd_region->bb, &res);
&nd_region->bb, &range);
if (nd_region->bb_state)
sysfs_notify_dirent(nd_region->bb_state);
}

11
drivers/pci/p2pdma.c
View File

@ -185,9 +185,8 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
return -ENOMEM;
pgmap = &p2p_pgmap->pgmap;
pgmap->res.start = pci_resource_start(pdev, bar) + offset;
pgmap->res.end = pgmap->res.start + size - 1;
pgmap->res.flags = pci_resource_flags(pdev, bar);
pgmap->range.start = pci_resource_start(pdev, bar) + offset;
pgmap->range.end = pgmap->range.start + size - 1;
pgmap->type = MEMORY_DEVICE_PCI_P2PDMA;
p2p_pgmap->provider = pdev;
@ -202,13 +201,13 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
error = gen_pool_add_owner(pdev->p2pdma->pool, (unsigned long)addr,
pci_bus_address(pdev, bar) + offset,
resource_size(&pgmap->res), dev_to_node(&pdev->dev),
range_len(&pgmap->range), dev_to_node(&pdev->dev),
pgmap->ref);
if (error)
goto pages_free;
pci_info(pdev, "added peer-to-peer DMA memory %pR\n",
&pgmap->res);
pci_info(pdev, "added peer-to-peer DMA memory %#llx-%#llx\n",
pgmap->range.start, pgmap->range.end);
return 0;

44
drivers/xen/unpopulated-alloc.c
View File

@ -18,27 +18,37 @@ static unsigned int list_count;
static int fill_list(unsigned int nr_pages)
{
struct dev_pagemap *pgmap;
struct resource *res;
void *vaddr;
unsigned int i, alloc_pages = round_up(nr_pages, PAGES_PER_SECTION);
int ret;
int ret = -ENOMEM;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res)
return -ENOMEM;
pgmap = kzalloc(sizeof(*pgmap), GFP_KERNEL);
if (!pgmap)
return -ENOMEM;
goto err_pgmap;
pgmap->type = MEMORY_DEVICE_GENERIC;
pgmap->res.name = "Xen scratch";
pgmap->res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
res->name = "Xen scratch";
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
ret = allocate_resource(&iomem_resource, &pgmap->res,
ret = allocate_resource(&iomem_resource, res,
alloc_pages * PAGE_SIZE, 0, -1,
PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
if (ret < 0) {
pr_err("Cannot allocate new IOMEM resource\n");
kfree(pgmap);
return ret;
goto err_resource;
}
pgmap->range = (struct range) {
.start = res->start,
.end = res->end,
};
pgmap->owner = res;
#ifdef CONFIG_XEN_HAVE_PVMMU
/*
* memremap will build page tables for the new memory so
@ -50,14 +60,13 @@ static int fill_list(unsigned int nr_pages)
* conflict with any devices.
*/
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
xen_pfn_t pfn = PFN_DOWN(pgmap->res.start);
xen_pfn_t pfn = PFN_DOWN(res->start);
for (i = 0; i < alloc_pages; i++) {
if (!set_phys_to_machine(pfn + i, INVALID_P2M_ENTRY)) {
pr_warn("set_phys_to_machine() failed, no memory added\n");
release_resource(&pgmap->res);
kfree(pgmap);
return -ENOMEM;
ret = -ENOMEM;
goto err_memremap;
}
}
}
@ -66,9 +75,8 @@ static int fill_list(unsigned int nr_pages)
vaddr = memremap_pages(pgmap, NUMA_NO_NODE);
if (IS_ERR(vaddr)) {
pr_err("Cannot remap memory range\n");
release_resource(&pgmap->res);
kfree(pgmap);
return PTR_ERR(vaddr);
ret = PTR_ERR(vaddr);
goto err_memremap;
}
for (i = 0; i < alloc_pages; i++) {
@ -80,6 +88,14 @@ static int fill_list(unsigned int nr_pages)
}
return 0;
err_memremap:
release_resource(res);
err_resource:
kfree(pgmap);
err_pgmap:
kfree(res);
return ret;
}
/**

5
include/linux/memremap.h
View File

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MEMREMAP_H_
#define _LINUX_MEMREMAP_H_
#include <linux/range.h>
#include <linux/ioport.h>
#include <linux/percpu-refcount.h>
@ -93,7 +94,7 @@ struct dev_pagemap_ops {
/**
* struct dev_pagemap - metadata for ZONE_DEVICE mappings
* @altmap: pre-allocated/reserved memory for vmemmap allocations
* @res: physical address range covered by @ref
* @range: physical address range covered by @ref
* @ref: reference count that pins the devm_memremap_pages() mapping
* @internal_ref: internal reference if @ref is not provided by the caller
* @done: completion for @internal_ref
@ -106,7 +107,7 @@ struct dev_pagemap_ops {
*/
struct dev_pagemap {
struct vmem_altmap altmap;
struct resource res;
struct range range;
struct percpu_ref *ref;
struct percpu_ref internal_ref;
struct completion done;

6
include/linux/range.h
View File

@ -1,12 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_RANGE_H
#define _LINUX_RANGE_H
#include <linux/types.h>
struct range {
u64 start;
u64 end;
};
static inline u64 range_len(const struct range *range)
{
return range->end - range->start + 1;
}
int add_range(struct range *range, int az, int nr_range,
u64 start, u64 end);

50
lib/test_hmm.c
View File

@ -460,6 +460,21 @@ static bool dmirror_allocate_chunk(struct dmirror_device *mdevice,
unsigned long pfn_last;
void *ptr;
devmem = kzalloc(sizeof(*devmem), GFP_KERNEL);
if (!devmem)
return -ENOMEM;
res = request_free_mem_region(&iomem_resource, DEVMEM_CHUNK_SIZE,
"hmm_dmirror");
if (IS_ERR(res))
goto err_devmem;
devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
devmem->pagemap.range.start = res->start;
devmem->pagemap.range.end = res->end;
devmem->pagemap.ops = &dmirror_devmem_ops;
devmem->pagemap.owner = mdevice;
mutex_lock(&mdevice->devmem_lock);
if (mdevice->devmem_count == mdevice->devmem_capacity) {
@ -472,33 +487,18 @@ static bool dmirror_allocate_chunk(struct dmirror_device *mdevice,
sizeof(new_chunks[0]) * new_capacity,
GFP_KERNEL);
if (!new_chunks)
goto err;
goto err_release;
mdevice->devmem_capacity = new_capacity;
mdevice->devmem_chunks = new_chunks;
}
res = request_free_mem_region(&iomem_resource, DEVMEM_CHUNK_SIZE,
"hmm_dmirror");
if (IS_ERR(res))
goto err;
devmem = kzalloc(sizeof(*devmem), GFP_KERNEL);
if (!devmem)
goto err_release;
devmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
devmem->pagemap.res = *res;
devmem->pagemap.ops = &dmirror_devmem_ops;
devmem->pagemap.owner = mdevice;
ptr = memremap_pages(&devmem->pagemap, numa_node_id());
if (IS_ERR(ptr))
goto err_free;
goto err_release;
devmem->mdevice = mdevice;
pfn_first = devmem->pagemap.res.start >> PAGE_SHIFT;
pfn_last = pfn_first +
(resource_size(&devmem->pagemap.res) >> PAGE_SHIFT);
pfn_first = devmem->pagemap.range.start >> PAGE_SHIFT;
pfn_last = pfn_first + (range_len(&devmem->pagemap.range) >> PAGE_SHIFT);
mdevice->devmem_chunks[mdevice->devmem_count++] = devmem;
mutex_unlock(&mdevice->devmem_lock);
@ -525,12 +525,12 @@ static bool dmirror_allocate_chunk(struct dmirror_device *mdevice,
return true;
err_free:
kfree(devmem);
err_release:
release_mem_region(res->start, resource_size(res));
err:
mutex_unlock(&mdevice->devmem_lock);
release_mem_region(devmem->pagemap.range.start, range_len(&devmem->pagemap.range));
err_devmem:
kfree(devmem);
return false;
}
@ -1100,8 +1100,8 @@ static void dmirror_device_remove(struct dmirror_device *mdevice)
mdevice->devmem_chunks[i];
memunmap_pages(&devmem->pagemap);
release_mem_region(devmem->pagemap.res.start,
resource_size(&devmem->pagemap.res));
release_mem_region(devmem->pagemap.range.start,
range_len(&devmem->pagemap.range));
kfree(devmem);
}
kfree(mdevice->devmem_chunks);

77
mm/memremap.c
View File

@ -70,24 +70,24 @@ static void devmap_managed_enable_put(void)
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
static void pgmap_array_delete(struct resource *res)
static void pgmap_array_delete(struct range *range)
{
xa_store_range(&pgmap_array, PHYS_PFN(res->start), PHYS_PFN(res->end),
xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end),
NULL, GFP_KERNEL);
synchronize_rcu();
}
static unsigned long pfn_first(struct dev_pagemap *pgmap)
{
return PHYS_PFN(pgmap->res.start) +
return PHYS_PFN(pgmap->range.start) +
vmem_altmap_offset(pgmap_altmap(pgmap));
}
static unsigned long pfn_end(struct dev_pagemap *pgmap)
{
const struct resource *res = &pgmap->res;
const struct range *range = &pgmap->range;
return (res->start + resource_size(res)) >> PAGE_SHIFT;
return (range->start + range_len(range)) >> PAGE_SHIFT;
}
static unsigned long pfn_next(unsigned long pfn)
@ -126,7 +126,7 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap)
void memunmap_pages(struct dev_pagemap *pgmap)
{
struct resource *res = &pgmap->res;
struct range *range = &pgmap->range;
struct page *first_page;
unsigned long pfn;
int nid;
@ -143,20 +143,20 @@ void memunmap_pages(struct dev_pagemap *pgmap)
nid = page_to_nid(first_page);
mem_hotplug_begin();
remove_pfn_range_from_zone(page_zone(first_page), PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)));
remove_pfn_range_from_zone(page_zone(first_page), PHYS_PFN(range->start),
PHYS_PFN(range_len(range)));
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
__remove_pages(PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), NULL);
__remove_pages(PHYS_PFN(range->start),
PHYS_PFN(range_len(range)), NULL);
} else {
arch_remove_memory(nid, res->start, resource_size(res),
arch_remove_memory(nid, range->start, range_len(range),
pgmap_altmap(pgmap));
kasan_remove_zero_shadow(__va(res->start), resource_size(res));
kasan_remove_zero_shadow(__va(range->start), range_len(range));
}
mem_hotplug_done();
untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res));
pgmap_array_delete(res);
untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range));
pgmap_array_delete(range);
WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n");
devmap_managed_enable_put();
}
@ -182,7 +182,7 @@ static void dev_pagemap_percpu_release(struct percpu_ref *ref)
*/
void *memremap_pages(struct dev_pagemap *pgmap, int nid)
{
struct resource *res = &pgmap->res;
struct range *range = &pgmap->range;
struct dev_pagemap *conflict_pgmap;
struct mhp_params params = {
/*
@ -251,7 +251,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
return ERR_PTR(error);
}
conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->start), NULL);
conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->start), NULL);
if (conflict_pgmap) {
WARN(1, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
@ -259,7 +259,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
goto err_array;
}
conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->end), NULL);
conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->end), NULL);
if (conflict_pgmap) {
WARN(1, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
@ -267,26 +267,27 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
goto err_array;
}
is_ram = region_intersects(res->start, resource_size(res),
is_ram = region_intersects(range->start, range_len(range),
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE);
if (is_ram != REGION_DISJOINT) {
WARN_ONCE(1, "%s attempted on %s region %pr\n", __func__,
is_ram == REGION_MIXED ? "mixed" : "ram", res);
WARN_ONCE(1, "attempted on %s region %#llx-%#llx\n",
is_ram == REGION_MIXED ? "mixed" : "ram",
range->start, range->end);
error = -ENXIO;
goto err_array;
}
error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(res->start),
PHYS_PFN(res->end), pgmap, GFP_KERNEL));
error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(range->start),
PHYS_PFN(range->end), pgmap, GFP_KERNEL));
if (error)
goto err_array;
if (nid < 0)
nid = numa_mem_id();
error = track_pfn_remap(NULL, &params.pgprot, PHYS_PFN(res->start),
0, resource_size(res));
error = track_pfn_remap(NULL, &params.pgprot, PHYS_PFN(range->start), 0,
range_len(range));
if (error)
goto err_pfn_remap;
@ -304,16 +305,16 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
* arch_add_memory().
*/
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
error = add_pages(nid, PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), &params);
error = add_pages(nid, PHYS_PFN(range->start),
PHYS_PFN(range_len(range)), &params);
} else {
error = kasan_add_zero_shadow(__va(res->start), resource_size(res));
error = kasan_add_zero_shadow(__va(range->start), range_len(range));
if (error) {
mem_hotplug_done();
goto err_kasan;
}
error = arch_add_memory(nid, res->start, resource_size(res),
error = arch_add_memory(nid, range->start, range_len(range),
&params);
}
@ -321,8 +322,8 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
struct zone *zone;
zone = &NODE_DATA(nid)->node_zones[ZONE_DEVICE];
move_pfn_range_to_zone(zone, PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), params.altmap);
move_pfn_range_to_zone(zone, PHYS_PFN(range->start),
PHYS_PFN(range_len(range)), params.altmap);
}
mem_hotplug_done();
@ -334,17 +335,17 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
* to allow us to do the work while not holding the hotplug lock.
*/
memmap_init_zone_device(&NODE_DATA(nid)->node_zones[ZONE_DEVICE],
PHYS_PFN(res->start),
PHYS_PFN(resource_size(res)), pgmap);
PHYS_PFN(range->start),
PHYS_PFN(range_len(range)), pgmap);
percpu_ref_get_many(pgmap->ref, pfn_end(pgmap) - pfn_first(pgmap));
return __va(res->start);
return __va(range->start);
err_add_memory:
kasan_remove_zero_shadow(__va(res->start), resource_size(res));
kasan_remove_zero_shadow(__va(range->start), range_len(range));
err_kasan:
untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res));
untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range));
err_pfn_remap:
pgmap_array_delete(res);
pgmap_array_delete(range);
err_array:
dev_pagemap_kill(pgmap);
dev_pagemap_cleanup(pgmap);
@ -369,7 +370,7 @@ EXPORT_SYMBOL_GPL(memremap_pages);
* 'live' on entry and will be killed and reaped at
* devm_memremap_pages_release() time, or if this routine fails.
*
* 4/ res is expected to be a host memory range that could feasibly be
* 4/ range 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.
*/
@ -426,7 +427,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn,
* In the cached case we're already holding a live reference.
*/
if (pgmap) {
if (phys >= pgmap->res.start && phys <= pgmap->res.end)
if (phys >= pgmap->range.start && phys <= pgmap->range.end)
return pgmap;
put_dev_pagemap(pgmap);
}

2
tools/testing/nvdimm/test/iomap.c
View File

@ -126,7 +126,7 @@ static void dev_pagemap_percpu_release(struct percpu_ref *ref)
void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
int error;
resource_size_t offset = pgmap->res.start;
resource_size_t offset = pgmap->range.start;
struct nfit_test_resource *nfit_res = get_nfit_res(offset);
if (!nfit_res)