diff options
Diffstat (limited to 'drivers/nvdimm/pmem.c')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index b5f81b0..3fc6896 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -196,9 +196,6 @@ void pmem_release_disk(void *disk) put_disk(disk); } -static struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn, - struct resource *res, struct vmem_altmap *altmap); - static int pmem_attach_disk(struct device *dev, struct nd_namespace_common *ndns) { @@ -310,187 +307,6 @@ static int pmem_attach_disk(struct device *dev, return 0; } -static int nd_pfn_init(struct nd_pfn *nd_pfn) -{ - struct nd_namespace_common *ndns = nd_pfn->ndns; - u32 start_pad = 0, end_trunc = 0; - resource_size_t start, size; - struct nd_namespace_io *nsio; - struct nd_region *nd_region; - struct nd_pfn_sb *pfn_sb; - unsigned long npfns; - phys_addr_t offset; - u64 checksum; - int rc; - - pfn_sb = devm_kzalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL); - if (!pfn_sb) - return -ENOMEM; - - nd_pfn->pfn_sb = pfn_sb; - rc = nd_pfn_validate(nd_pfn); - if (rc == -ENODEV) - /* no info block, do init */; - else - return rc; - - nd_region = to_nd_region(nd_pfn->dev.parent); - if (nd_region->ro) { - dev_info(&nd_pfn->dev, - "%s is read-only, unable to init metadata\n", - dev_name(&nd_region->dev)); - return -ENXIO; - } - - memset(pfn_sb, 0, sizeof(*pfn_sb)); - - /* - * Check if pmem collides with 'System RAM' when section aligned and - * trim it accordingly - */ - nsio = to_nd_namespace_io(&ndns->dev); - start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start); - size = resource_size(&nsio->res); - if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM, - IORES_DESC_NONE) == REGION_MIXED) { - - start = nsio->res.start; - start_pad = PHYS_SECTION_ALIGN_UP(start) - start; - } - - start = nsio->res.start; - size = PHYS_SECTION_ALIGN_UP(start + size) - start; - if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM, - IORES_DESC_NONE) == REGION_MIXED) { - size = resource_size(&nsio->res); - end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size); - } - - if (start_pad + end_trunc) - dev_info(&nd_pfn->dev, "%s section 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 += start_pad; - size = resource_size(&nsio->res); - npfns = (size - start_pad - end_trunc - SZ_8K) / SZ_4K; - if (nd_pfn->mode == PFN_MODE_PMEM) - offset = ALIGN(start + SZ_8K + 64 * npfns, nd_pfn->align) - - start; - else if (nd_pfn->mode == PFN_MODE_RAM) - offset = ALIGN(start + SZ_8K, nd_pfn->align) - start; - else - return -ENXIO; - - if (offset + start_pad + end_trunc >= 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; - pfn_sb->mode = cpu_to_le32(nd_pfn->mode); - pfn_sb->dataoff = cpu_to_le64(offset); - pfn_sb->npfns = cpu_to_le64(npfns); - memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN); - memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); - 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(1); - pfn_sb->start_pad = cpu_to_le32(start_pad); - pfn_sb->end_trunc = cpu_to_le32(end_trunc); - checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); - pfn_sb->checksum = cpu_to_le64(checksum); - - return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)); -} - -/* - * We hotplug memory at 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); -} - -static unsigned long init_altmap_reserve(resource_size_t base) -{ - unsigned long reserve = PHYS_PFN(SZ_8K); - unsigned long base_pfn = PHYS_PFN(base); - - reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn); - return reserve; -} - -static struct vmem_altmap *__nvdimm_setup_pfn(struct nd_pfn *nd_pfn, - struct resource *res, struct vmem_altmap *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); - u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); - 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; - struct vmem_altmap __altmap = { - .base_pfn = init_altmap_base(base), - .reserve = init_altmap_reserve(base), - }; - - memcpy(res, &nsio->res, sizeof(*res)); - res->start += start_pad; - res->end -= end_trunc; - - nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode); - if (nd_pfn->mode == PFN_MODE_RAM) { - if (offset < SZ_8K) - return ERR_PTR(-EINVAL); - nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); - altmap = NULL; - } else if (nd_pfn->mode == PFN_MODE_PMEM) { - nd_pfn->npfns = (resource_size(res) - offset) / PAGE_SIZE; - 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", - le64_to_cpu(nd_pfn->pfn_sb->npfns), - nd_pfn->npfns); - memcpy(altmap, &__altmap, sizeof(*altmap)); - altmap->free = PHYS_PFN(offset - SZ_8K); - altmap->alloc = 0; - } else - return ERR_PTR(-ENXIO); - - return altmap; -} - -/* - * Determine the effective resource range and vmem_altmap from an nd_pfn - * instance. - */ -static struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn, - struct resource *res, struct vmem_altmap *altmap) -{ - int rc; - - if (!nd_pfn->uuid || !nd_pfn->ndns) - return ERR_PTR(-ENODEV); - - rc = nd_pfn_init(nd_pfn); - if (rc) - return ERR_PTR(rc); - - /* we need a valid pfn_sb before we can init a vmem_altmap */ - return __nvdimm_setup_pfn(nd_pfn, res, altmap); -} - static int nd_pmem_probe(struct device *dev) { struct nd_namespace_common *ndns; |
