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libnvdimm/pfn: stop padding pmem namespaces to section alignment 

Now that the mm core supports section-unaligned hotplug of ZONE_DEVICE
memory, we no longer need to add padding at pfn/dax device creation
time.  The kernel will still honor padding established by older kernels.

Link: http://lkml.kernel.org/r/156092356588.979959.6793371748950931916.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Jeff Moyer <jmoyer@redhat.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>	[ppc64]
Cc: David Hildenbrand <david@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2019-07-18 15:58:40 -07:00 committed by Linus Torvalds
parent 7e3e888dfc
commit a3619190d6
3 changed files with 16 additions and 78 deletions
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14
drivers/nvdimm/pfn.h
View File

@ -33,18 +33,4 @@ struct nd_pfn_sb {
__le64 checksum;
};
#ifdef CONFIG_SPARSEMEM
#define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
#define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
#else
/*
* In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
* but we still want pmem to compile.
*/
#define PFN_SECTION_ALIGN_DOWN(x) (x)
#define PFN_SECTION_ALIGN_UP(x) (x)
#endif
#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
#endif /* __NVDIMM_PFN_H */

77
drivers/nvdimm/pfn_devs.c
View File

@ -587,14 +587,14 @@ static u32 info_block_reserve(void)
}
/*
* We hotplug memory at section granularity, pad the reserved area from
* the previous section base to the namespace base address.
* We hotplug memory at sub-section granularity, pad the reserved area
* from the previous section base to the namespace base address.
*/
static unsigned long init_altmap_base(resource_size_t base)
{
unsigned long base_pfn = PHYS_PFN(base);
return PFN_SECTION_ALIGN_DOWN(base_pfn);
return SUBSECTION_ALIGN_DOWN(base_pfn);
}
static unsigned long init_altmap_reserve(resource_size_t base)
@ -602,7 +602,7 @@ static unsigned long init_altmap_reserve(resource_size_t base)
unsigned long reserve = info_block_reserve() >> PAGE_SHIFT;
unsigned long base_pfn = PHYS_PFN(base);
reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
reserve += base_pfn - SUBSECTION_ALIGN_DOWN(base_pfn);
return reserve;
}
@ -632,8 +632,7 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
} else if (nd_pfn->mode == PFN_MODE_PMEM) {
nd_pfn->npfns = PFN_SECTION_ALIGN_UP((resource_size(res)
- offset) / PAGE_SIZE);
nd_pfn->npfns = PHYS_PFN((resource_size(res) - 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",
@ -649,54 +648,14 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
return 0;
}
static u64 phys_pmem_align_down(struct nd_pfn *nd_pfn, u64 phys)
{
return min_t(u64, PHYS_SECTION_ALIGN_DOWN(phys),
ALIGN_DOWN(phys, nd_pfn->align));
}
/*
* Check if pmem collides with 'System RAM', or other regions when
* section aligned. Trim it accordingly.
*/
static void trim_pfn_device(struct nd_pfn *nd_pfn, u32 *start_pad, u32 *end_trunc)
{
struct nd_namespace_common *ndns = nd_pfn->ndns;
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
const resource_size_t start = nsio->res.start;
const resource_size_t end = start + resource_size(&nsio->res);
resource_size_t adjust, size;
*start_pad = 0;
*end_trunc = 0;
adjust = start - PHYS_SECTION_ALIGN_DOWN(start);
size = resource_size(&nsio->res) + adjust;
if (region_intersects(start - adjust, size, IORESOURCE_SYSTEM_RAM,
IORES_DESC_NONE) == REGION_MIXED
|| nd_region_conflict(nd_region, start - adjust, size))
*start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
/* Now check that end of the range does not collide. */
adjust = PHYS_SECTION_ALIGN_UP(end) - end;
size = resource_size(&nsio->res) + adjust;
if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
IORES_DESC_NONE) == REGION_MIXED
|| !IS_ALIGNED(end, nd_pfn->align)
|| nd_region_conflict(nd_region, start, size))
*end_trunc = end - phys_pmem_align_down(nd_pfn, end);
}
static int nd_pfn_init(struct nd_pfn *nd_pfn)
{
struct nd_namespace_common *ndns = nd_pfn->ndns;
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
u32 start_pad, end_trunc, reserve = info_block_reserve();
resource_size_t start, size;
struct nd_region *nd_region;
unsigned long npfns, align;
struct nd_pfn_sb *pfn_sb;
unsigned long npfns;
phys_addr_t offset;
const char *sig;
u64 checksum;
@ -727,43 +686,35 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
return -ENXIO;
}
memset(pfn_sb, 0, sizeof(*pfn_sb));
trim_pfn_device(nd_pfn, &start_pad, &end_trunc);
if (start_pad + end_trunc)
dev_info(&nd_pfn->dev, "%s alignment collision, truncate %d bytes\n",
dev_name(&ndns->dev), start_pad + end_trunc);
/*
* Note, we use 64 here for the standard size of struct page,
* debugging options may cause it to be larger in which case the
* implementation will limit the pfns advertised through
* ->direct_access() to those that are included in the memmap.
*/
start = nsio->res.start + start_pad;
start = nsio->res.start;
size = resource_size(&nsio->res);
npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - reserve)
/ PAGE_SIZE);
npfns = PHYS_PFN(size - SZ_8K);
align = max(nd_pfn->align, (1UL << SUBSECTION_SHIFT));
if (nd_pfn->mode == PFN_MODE_PMEM) {
/*
* The altmap should be padded out to the block size used
* when populating the vmemmap. This *should* be equal to
* PMD_SIZE for most architectures.
*/
offset = ALIGN(start + reserve + 64 * npfns,
max(nd_pfn->align, PMD_SIZE)) - start;
offset = ALIGN(start + SZ_8K + 64 * npfns, align) - start;
} else if (nd_pfn->mode == PFN_MODE_RAM)
offset = ALIGN(start + reserve, nd_pfn->align) - start;
offset = ALIGN(start + SZ_8K, align) - start;
else
return -ENXIO;
if (offset + start_pad + end_trunc >= size) {
if (offset >= size) {
dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
dev_name(&ndns->dev));
return -ENXIO;
}
npfns = (size - offset - start_pad - end_trunc) / SZ_4K;
npfns = PHYS_PFN(size - offset);
pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
pfn_sb->dataoff = cpu_to_le64(offset);
pfn_sb->npfns = cpu_to_le64(npfns);
@ -772,8 +723,6 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
pfn_sb->version_major = cpu_to_le16(1);
pfn_sb->version_minor = cpu_to_le16(3);
pfn_sb->start_pad = cpu_to_le32(start_pad);
pfn_sb->end_trunc = cpu_to_le32(end_trunc);
pfn_sb->align = cpu_to_le32(nd_pfn->align);
checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
pfn_sb->checksum = cpu_to_le64(checksum);

3
include/linux/mmzone.h
View File

@ -1160,6 +1160,9 @@ static inline unsigned long section_nr_to_pfn(unsigned long sec)
#define SUBSECTIONS_PER_SECTION (1UL << (SECTION_SIZE_BITS - SUBSECTION_SHIFT))
#endif
#define SUBSECTION_ALIGN_UP(pfn) ALIGN((pfn), PAGES_PER_SUBSECTION)
#define SUBSECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SUBSECTION_MASK)
struct mem_section_usage {
DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION);
/* See declaration of similar field in struct zone */