diff options
Diffstat (limited to 'drivers/nvdimm/claim.c')
| -rw-r--r-- | drivers/nvdimm/claim.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c index e8f03b0e95e4..5f53db59a058 100644 --- a/drivers/nvdimm/claim.c +++ b/drivers/nvdimm/claim.c @@ -12,6 +12,7 @@ */ #include <linux/device.h> #include <linux/sizes.h> +#include <linux/pmem.h> #include "nd-core.h" #include "pfn.h" #include "btt.h" @@ -84,6 +85,8 @@ static bool is_idle(struct device *dev, struct nd_namespace_common *ndns) seed = nd_region->btt_seed; else if (is_nd_pfn(dev)) seed = nd_region->pfn_seed; + else if (is_nd_dax(dev)) + seed = nd_region->dax_seed; if (seed == dev || ndns || dev->driver) return false; @@ -199,3 +202,63 @@ u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb) return sum; } EXPORT_SYMBOL(nd_sb_checksum); + +static int nsio_rw_bytes(struct nd_namespace_common *ndns, + resource_size_t offset, void *buf, size_t size, int rw) +{ + struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); + + if (unlikely(offset + size > nsio->size)) { + dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); + return -EFAULT; + } + + if (rw == READ) { + unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512); + + if (unlikely(is_bad_pmem(&nsio->bb, offset / 512, sz_align))) + return -EIO; + return memcpy_from_pmem(buf, nsio->addr + offset, size); + } else { + memcpy_to_pmem(nsio->addr + offset, buf, size); + wmb_pmem(); + } + + return 0; +} + +int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio) +{ + struct resource *res = &nsio->res; + struct nd_namespace_common *ndns = &nsio->common; + + nsio->size = resource_size(res); + if (!devm_request_mem_region(dev, res->start, resource_size(res), + dev_name(dev))) { + dev_warn(dev, "could not reserve region %pR\n", res); + return -EBUSY; + } + + ndns->rw_bytes = nsio_rw_bytes; + if (devm_init_badblocks(dev, &nsio->bb)) + return -ENOMEM; + nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb, + &nsio->res); + + nsio->addr = devm_memremap(dev, res->start, resource_size(res), + ARCH_MEMREMAP_PMEM); + if (IS_ERR(nsio->addr)) + return PTR_ERR(nsio->addr); + return 0; +} +EXPORT_SYMBOL_GPL(devm_nsio_enable); + +void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio) +{ + struct resource *res = &nsio->res; + + devm_memunmap(dev, nsio->addr); + devm_exit_badblocks(dev, &nsio->bb); + devm_release_mem_region(dev, res->start, resource_size(res)); +} +EXPORT_SYMBOL_GPL(devm_nsio_disable); |