libnvdimm, pmem: adjust for section collisions with 'System RAM'
On a platform where 'Persistent Memory' and 'System RAM' are mixed within a given sparsemem section, trim the namespace and notify about the sub-optimal alignment. Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
parent
d9cbe09d39
commit
cfe30b8720
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@ -133,6 +133,7 @@ bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
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bool pmem_should_map_pages(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev->parent);
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struct nd_namespace_io *nsio;
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if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
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return false;
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@ -143,6 +144,12 @@ bool pmem_should_map_pages(struct device *dev)
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if (is_nd_pfn(dev) || is_nd_btt(dev))
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return false;
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nsio = to_nd_namespace_io(dev);
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if (region_intersects(nsio->res.start, resource_size(&nsio->res),
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IORESOURCE_SYSTEM_RAM,
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IORES_DESC_NONE) == REGION_MIXED)
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return false;
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#ifdef ARCH_MEMREMAP_PMEM
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return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
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#else
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@ -27,10 +27,13 @@ struct nd_pfn_sb {
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__le32 flags;
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__le16 version_major;
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__le16 version_minor;
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__le64 dataoff;
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__le64 dataoff; /* relative to namespace_base + start_pad */
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__le64 npfns;
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__le32 mode;
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u8 padding[4012];
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/* minor-version-1 additions for section alignment */
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__le32 start_pad;
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__le32 end_trunc;
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u8 padding[4004];
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__le64 checksum;
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};
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@ -45,4 +48,7 @@ struct nd_pfn_sb {
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#define PFN_SECTION_ALIGN_DOWN(x) (x)
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#define PFN_SECTION_ALIGN_UP(x) (x)
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#endif
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#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
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#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
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#endif /* __NVDIMM_PFN_H */
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@ -299,6 +299,11 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
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if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
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return -ENODEV;
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if (__le16_to_cpu(pfn_sb->version_minor) < 1) {
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pfn_sb->start_pad = 0;
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pfn_sb->end_trunc = 0;
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}
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switch (le32_to_cpu(pfn_sb->mode)) {
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case PFN_MODE_RAM:
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case PFN_MODE_PMEM:
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@ -43,7 +43,10 @@ struct pmem_device {
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phys_addr_t data_offset;
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u64 pfn_flags;
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void __pmem *virt_addr;
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/* immutable base size of the namespace */
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size_t size;
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/* trim size when namespace capacity has been section aligned */
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u32 pfn_pad;
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struct badblocks bb;
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};
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@ -145,7 +148,7 @@ static long pmem_direct_access(struct block_device *bdev, sector_t sector,
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*kaddr = pmem->virt_addr + offset;
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*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
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return pmem->size - offset;
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return pmem->size - pmem->pfn_pad - offset;
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}
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static const struct block_device_operations pmem_fops = {
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@ -236,7 +239,8 @@ static int pmem_attach_disk(struct device *dev,
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disk->flags = GENHD_FL_EXT_DEVT;
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nvdimm_namespace_disk_name(ndns, disk->disk_name);
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disk->driverfs_dev = dev;
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set_capacity(disk, (pmem->size - pmem->data_offset) / 512);
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set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
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/ 512);
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pmem->pmem_disk = disk;
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devm_exit_badblocks(dev, &pmem->bb);
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if (devm_init_badblocks(dev, &pmem->bb))
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@ -279,6 +283,9 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
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struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
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struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev);
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = 0, end_trunc = 0;
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resource_size_t start, size;
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struct nd_namespace_io *nsio;
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struct nd_region *nd_region;
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unsigned long npfns;
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phys_addr_t offset;
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@ -304,21 +311,56 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
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}
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memset(pfn_sb, 0, sizeof(*pfn_sb));
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npfns = (pmem->size - SZ_8K) / SZ_4K;
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/*
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* Check if pmem collides with 'System RAM' when section aligned and
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* trim it accordingly
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*/
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nsio = to_nd_namespace_io(&ndns->dev);
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start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start);
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size = resource_size(&nsio->res);
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if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
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IORES_DESC_NONE) == REGION_MIXED) {
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start = nsio->res.start;
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start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
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}
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start = nsio->res.start;
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size = PHYS_SECTION_ALIGN_UP(start + size) - start;
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if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
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IORES_DESC_NONE) == REGION_MIXED) {
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size = resource_size(&nsio->res);
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end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size);
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}
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if (start_pad + end_trunc)
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dev_info(&nd_pfn->dev, "%s section collision, truncate %d bytes\n",
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dev_name(&ndns->dev), start_pad + end_trunc);
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/*
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* Note, we use 64 here for the standard size of struct page,
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* debugging options may cause it to be larger in which case the
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* implementation will limit the pfns advertised through
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* ->direct_access() to those that are included in the memmap.
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*/
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start += start_pad;
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npfns = (pmem->size - start_pad - end_trunc - SZ_8K) / SZ_4K;
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if (nd_pfn->mode == PFN_MODE_PMEM)
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offset = ALIGN(SZ_8K + 64 * npfns, nd_pfn->align);
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offset = ALIGN(start + SZ_8K + 64 * npfns, nd_pfn->align)
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- start;
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else if (nd_pfn->mode == PFN_MODE_RAM)
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offset = ALIGN(SZ_8K, nd_pfn->align);
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offset = ALIGN(start + SZ_8K, nd_pfn->align) - start;
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else
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goto err;
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npfns = (pmem->size - offset) / SZ_4K;
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if (offset + start_pad + end_trunc >= pmem->size) {
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dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
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dev_name(&ndns->dev));
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goto err;
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}
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npfns = (pmem->size - offset - start_pad - end_trunc) / SZ_4K;
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pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
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pfn_sb->dataoff = cpu_to_le64(offset);
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pfn_sb->npfns = cpu_to_le64(npfns);
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@ -326,6 +368,9 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn)
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memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
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memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
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pfn_sb->version_major = cpu_to_le16(1);
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pfn_sb->version_minor = cpu_to_le16(1);
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pfn_sb->start_pad = cpu_to_le32(start_pad);
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pfn_sb->end_trunc = cpu_to_le32(end_trunc);
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checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
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pfn_sb->checksum = cpu_to_le64(checksum);
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@ -376,41 +421,36 @@ static unsigned long init_altmap_reserve(resource_size_t base)
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return reserve;
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}
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static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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static int __nvdimm_namespace_attach_pfn(struct nd_pfn *nd_pfn)
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{
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
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struct device *dev = &nd_pfn->dev;
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struct nd_region *nd_region;
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struct vmem_altmap *altmap;
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struct nd_pfn_sb *pfn_sb;
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struct pmem_device *pmem;
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struct request_queue *q;
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phys_addr_t offset;
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int rc;
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struct resource res;
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struct request_queue *q;
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struct pmem_device *pmem;
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struct vmem_altmap *altmap;
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struct device *dev = &nd_pfn->dev;
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struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
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struct nd_namespace_common *ndns = nd_pfn->ndns;
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u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
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u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
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struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
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resource_size_t base = nsio->res.start + start_pad;
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struct vmem_altmap __altmap = {
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.base_pfn = init_altmap_base(nsio->res.start),
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.reserve = init_altmap_reserve(nsio->res.start),
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.base_pfn = init_altmap_base(base),
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.reserve = init_altmap_reserve(base),
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};
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if (!nd_pfn->uuid || !nd_pfn->ndns)
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return -ENODEV;
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nd_region = to_nd_region(dev->parent);
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rc = nd_pfn_init(nd_pfn);
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if (rc)
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return rc;
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pfn_sb = nd_pfn->pfn_sb;
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offset = le64_to_cpu(pfn_sb->dataoff);
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pmem = dev_get_drvdata(dev);
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pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
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pmem->pfn_pad = start_pad + end_trunc;
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nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
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if (nd_pfn->mode == PFN_MODE_RAM) {
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if (offset < SZ_8K)
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if (pmem->data_offset < SZ_8K)
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return -EINVAL;
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nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
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altmap = NULL;
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} else if (nd_pfn->mode == PFN_MODE_PMEM) {
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nd_pfn->npfns = (resource_size(&nsio->res) - offset)
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nd_pfn->npfns = (pmem->size - pmem->pfn_pad - pmem->data_offset)
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/ PAGE_SIZE;
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if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
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dev_info(&nd_pfn->dev,
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@ -418,7 +458,7 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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le64_to_cpu(nd_pfn->pfn_sb->npfns),
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nd_pfn->npfns);
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altmap = & __altmap;
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altmap->free = __phys_to_pfn(offset - SZ_8K);
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altmap->free = __phys_to_pfn(pmem->data_offset - SZ_8K);
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altmap->alloc = 0;
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} else {
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rc = -ENXIO;
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@ -426,10 +466,12 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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}
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/* establish pfn range for lookup, and switch to direct map */
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pmem = dev_get_drvdata(dev);
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q = pmem->pmem_queue;
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memcpy(&res, &nsio->res, sizeof(res));
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res.start += start_pad;
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res.end -= end_trunc;
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devm_memunmap(dev, (void __force *) pmem->virt_addr);
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pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &nsio->res,
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pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &res,
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&q->q_usage_counter, altmap);
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pmem->pfn_flags |= PFN_MAP;
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if (IS_ERR(pmem->virt_addr)) {
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@ -438,7 +480,6 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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}
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/* attach pmem disk in "pfn-mode" */
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pmem->data_offset = offset;
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rc = pmem_attach_disk(dev, ndns, pmem);
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if (rc)
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goto err;
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@ -447,6 +488,22 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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err:
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nvdimm_namespace_detach_pfn(ndns);
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return rc;
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}
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static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
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{
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struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
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int rc;
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if (!nd_pfn->uuid || !nd_pfn->ndns)
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return -ENODEV;
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rc = nd_pfn_init(nd_pfn);
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if (rc)
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return rc;
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/* we need a valid pfn_sb before we can init a vmem_altmap */
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return __nvdimm_namespace_attach_pfn(nd_pfn);
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}
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static int nd_pmem_probe(struct device *dev)
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