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Merge branch 'for-5.1/libnvdimm-start-pad' into libnvdimm-for-next
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Merge the initial lead-in cleanups and fixes that resulted from the
effort to resolve bugs in the section-alignment padding implementation
in the nvdimm core. The back half of this topic is abandoned in favor of
implementing sub-section hotplug support.
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Dan Williams committed Mar 11, 2019
2 parents 451fed2 + 4960461 commit 6fd96ff
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Showing 3 changed files with 46 additions and 20 deletions.
38 changes: 28 additions & 10 deletions drivers/dax/super.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -86,12 +86,14 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
{
struct dax_device *dax_dev;
bool dax_enabled = false;
pgoff_t pgoff, pgoff_end;
struct request_queue *q;
pgoff_t pgoff;
int err, id;
pfn_t pfn;
long len;
char buf[BDEVNAME_SIZE];
void *kaddr, *end_kaddr;
pfn_t pfn, end_pfn;
sector_t last_page;
long len, len2;
int err, id;

if (blocksize != PAGE_SIZE) {
pr_debug("%s: error: unsupported blocksize for dax\n",
Expand All @@ -113,6 +115,14 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
return false;
}

last_page = PFN_DOWN(i_size_read(bdev->bd_inode) - 1) * 8;
err = bdev_dax_pgoff(bdev, last_page, PAGE_SIZE, &pgoff_end);
if (err) {
pr_debug("%s: error: unaligned partition for dax\n",
bdevname(bdev, buf));
return false;
}

dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
if (!dax_dev) {
pr_debug("%s: error: device does not support dax\n",
Expand All @@ -121,14 +131,15 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
}

id = dax_read_lock();
len = dax_direct_access(dax_dev, pgoff, 1, NULL, &pfn);
len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn);
dax_read_unlock(id);

put_dax(dax_dev);

if (len < 1) {
if (len < 1 || len2 < 1) {
pr_debug("%s: error: dax access failed (%ld)\n",
bdevname(bdev, buf), len);
bdevname(bdev, buf), len < 1 ? len : len2);
return false;
}

Expand All @@ -143,13 +154,20 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
*/
WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API));
dax_enabled = true;
} else if (pfn_t_devmap(pfn)) {
struct dev_pagemap *pgmap;
} else if (pfn_t_devmap(pfn) && pfn_t_devmap(end_pfn)) {
struct dev_pagemap *pgmap, *end_pgmap;

pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL);
if (pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX)
end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL);
if (pgmap && pgmap == end_pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX
&& pfn_t_to_page(pfn)->pgmap == pgmap
&& pfn_t_to_page(end_pfn)->pgmap == pgmap
&& pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr))
&& pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr)))
dax_enabled = true;
put_dev_pagemap(pgmap);
put_dev_pagemap(end_pgmap);

}

if (!dax_enabled) {
Expand Down
4 changes: 4 additions & 0 deletions drivers/nvdimm/namespace_devs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -138,6 +138,7 @@ bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
bool pmem_should_map_pages(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_namespace_common *ndns = to_ndns(dev);
struct nd_namespace_io *nsio;

if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
Expand All @@ -149,6 +150,9 @@ bool pmem_should_map_pages(struct device *dev)
if (is_nd_pfn(dev) || is_nd_btt(dev))
return false;

if (ndns->force_raw)
return false;

nsio = to_nd_namespace_io(dev);
if (region_intersects(nsio->res.start, resource_size(&nsio->res),
IORESOURCE_SYSTEM_RAM,
Expand Down
24 changes: 14 additions & 10 deletions drivers/nvdimm/pfn_devs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -580,6 +580,11 @@ int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
}
EXPORT_SYMBOL(nd_pfn_probe);

static u32 info_block_reserve(void)
{
return ALIGN(SZ_8K, PAGE_SIZE);
}

/*
* We hotplug memory at section granularity, pad the reserved area from
* the previous section base to the namespace base address.
Expand All @@ -593,7 +598,7 @@ static unsigned long init_altmap_base(resource_size_t base)

static unsigned long init_altmap_reserve(resource_size_t base)
{
unsigned long reserve = PHYS_PFN(SZ_8K);
unsigned long reserve = info_block_reserve() >> PAGE_SHIFT;
unsigned long base_pfn = PHYS_PFN(base);

reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
Expand All @@ -608,6 +613,7 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
u64 offset = le64_to_cpu(pfn_sb->dataoff);
u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
u32 reserve = info_block_reserve();
struct nd_namespace_common *ndns = nd_pfn->ndns;
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
resource_size_t base = nsio->res.start + start_pad;
Expand All @@ -621,7 +627,7 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
res->end -= end_trunc;

if (nd_pfn->mode == PFN_MODE_RAM) {
if (offset < SZ_8K)
if (offset < reserve)
return -EINVAL;
nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
pgmap->altmap_valid = false;
Expand All @@ -634,7 +640,7 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
le64_to_cpu(nd_pfn->pfn_sb->npfns),
nd_pfn->npfns);
memcpy(altmap, &__altmap, sizeof(*altmap));
altmap->free = PHYS_PFN(offset - SZ_8K);
altmap->free = PHYS_PFN(offset - reserve);
altmap->alloc = 0;
pgmap->altmap_valid = true;
} else
Expand Down Expand Up @@ -678,18 +684,17 @@ static void trim_pfn_device(struct nd_pfn *nd_pfn, u32 *start_pad, u32 *end_trun
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 + adjust))
|| 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)
{
u32 dax_label_reserve = is_nd_dax(&nd_pfn->dev) ? SZ_128K : 0;
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;
u32 start_pad, end_trunc;
struct nd_pfn_sb *pfn_sb;
unsigned long npfns;
phys_addr_t offset;
Expand Down Expand Up @@ -734,19 +739,18 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
*/
start = nsio->res.start + start_pad;
size = resource_size(&nsio->res);
npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - SZ_8K)
npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - reserve)
/ PAGE_SIZE);
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 + SZ_8K + 64 * npfns + dax_label_reserve,
offset = ALIGN(start + reserve + 64 * npfns,
max(nd_pfn->align, PMD_SIZE)) - start;
} else if (nd_pfn->mode == PFN_MODE_RAM)
offset = ALIGN(start + SZ_8K + dax_label_reserve,
nd_pfn->align) - start;
offset = ALIGN(start + reserve, nd_pfn->align) - start;
else
return -ENXIO;

Expand Down

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