diff options
| -rw-r--r-- | drivers/nvdimm/dimm.c | 4 | ||||
| -rw-r--r-- | drivers/nvdimm/label.c | 93 | ||||
| -rw-r--r-- | drivers/nvdimm/label.h | 3 |
3 files changed, 88 insertions, 12 deletions
diff --git a/drivers/nvdimm/dimm.c b/drivers/nvdimm/dimm.c index 07bf96948553..9899c97138a3 100644 --- a/drivers/nvdimm/dimm.c +++ b/drivers/nvdimm/dimm.c @@ -84,10 +84,6 @@ static int nvdimm_probe(struct device *dev) dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size); nvdimm_bus_lock(dev); - ndd->ns_current = nd_label_validate(ndd); - ndd->ns_next = nd_label_next_nsindex(ndd->ns_current); - nd_label_copy(ndd, to_next_namespace_index(ndd), - to_current_namespace_index(ndd)); if (ndd->ns_current >= 0) { rc = nd_label_reserve_dpa(ndd); if (rc == 0) diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index 563f24af01b5..7f03d117824f 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -235,7 +235,7 @@ static int __nd_label_validate(struct nvdimm_drvdata *ndd) return -1; } -int nd_label_validate(struct nvdimm_drvdata *ndd) +static int nd_label_validate(struct nvdimm_drvdata *ndd) { /* * In order to probe for and validate namespace index blocks we @@ -258,8 +258,9 @@ int nd_label_validate(struct nvdimm_drvdata *ndd) return -1; } -void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst, - struct nd_namespace_index *src) +static void nd_label_copy(struct nvdimm_drvdata *ndd, + struct nd_namespace_index *dst, + struct nd_namespace_index *src) { /* just exit if either destination or source is NULL */ if (!dst || !src) @@ -419,7 +420,9 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd) int nd_label_data_init(struct nvdimm_drvdata *ndd) { - size_t config_size, read_size; + size_t config_size, read_size, max_xfer, offset; + struct nd_namespace_index *nsindex; + unsigned int i; int rc = 0; if (ndd->data) @@ -452,7 +455,87 @@ int nd_label_data_init(struct nvdimm_drvdata *ndd) if (!ndd->data) return -ENOMEM; - return nvdimm_get_config_data(ndd, ndd->data, 0, config_size); + /* + * We want to guarantee as few reads as possible while conserving + * memory. To do that we figure out how much unused space will be left + * in the last read, divide that by the total number of reads it is + * going to take given our maximum transfer size, and then reduce our + * maximum transfer size based on that result. + */ + max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size); + if (read_size < max_xfer) { + /* trim waste */ + max_xfer -= ((max_xfer - 1) - (config_size - 1) % max_xfer) / + DIV_ROUND_UP(config_size, max_xfer); + /* make certain we read indexes in exactly 1 read */ + if (max_xfer < read_size) + max_xfer = read_size; + } + + /* Make our initial read size a multiple of max_xfer size */ + read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer, + config_size); + + /* Read the index data */ + rc = nvdimm_get_config_data(ndd, ndd->data, 0, read_size); + if (rc) + goto out_err; + + /* Validate index data, if not valid assume all labels are invalid */ + ndd->ns_current = nd_label_validate(ndd); + if (ndd->ns_current < 0) + return 0; + + /* Record our index values */ + ndd->ns_next = nd_label_next_nsindex(ndd->ns_current); + + /* Copy "current" index on top of the "next" index */ + nsindex = to_current_namespace_index(ndd); + nd_label_copy(ndd, to_next_namespace_index(ndd), nsindex); + + /* Determine starting offset for label data */ + offset = __le64_to_cpu(nsindex->labeloff); + + /* Loop through the free list pulling in any active labels */ + for (i = 0; i < nsindex->nslot; i++, offset += ndd->nslabel_size) { + size_t label_read_size; + + /* zero out the unused labels */ + if (test_bit_le(i, nsindex->free)) { + memset(ndd->data + offset, 0, ndd->nslabel_size); + continue; + } + + /* if we already read past here then just continue */ + if (offset + ndd->nslabel_size <= read_size) + continue; + + /* if we haven't read in a while reset our read_size offset */ + if (read_size < offset) + read_size = offset; + + /* determine how much more will be read after this next call. */ + label_read_size = offset + ndd->nslabel_size - read_size; + label_read_size = DIV_ROUND_UP(label_read_size, max_xfer) * + max_xfer; + + /* truncate last read if needed */ + if (read_size + label_read_size > config_size) + label_read_size = config_size - read_size; + + /* Read the label data */ + rc = nvdimm_get_config_data(ndd, ndd->data + read_size, + read_size, label_read_size); + if (rc) + goto out_err; + + /* push read_size to next read offset */ + read_size += label_read_size; + } + + dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc); +out_err: + return rc; } int nd_label_active_count(struct nvdimm_drvdata *ndd) diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h index 685afb3de0fe..e9a2ad3c2150 100644 --- a/drivers/nvdimm/label.h +++ b/drivers/nvdimm/label.h @@ -138,9 +138,6 @@ static inline int nd_label_next_nsindex(int index) } struct nvdimm_drvdata; -int nd_label_validate(struct nvdimm_drvdata *ndd); -void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst, - struct nd_namespace_index *src); int nd_label_data_init(struct nvdimm_drvdata *ndd); size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd); int nd_label_active_count(struct nvdimm_drvdata *ndd); |