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path: root/drivers/nvdimm/namespace_devs.c
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Diffstat (limited to 'drivers/nvdimm/namespace_devs.c')
-rw-r--r--drivers/nvdimm/namespace_devs.c128
1 files changed, 90 insertions, 38 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 132c5b8b5366..81451c74b01c 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -529,19 +529,68 @@ static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
return rc ? n : 0;
}
-static bool space_valid(bool is_pmem, bool is_reserve,
- struct nd_label_id *label_id, struct resource *res)
+
+/**
+ * space_valid() - validate free dpa space against constraints
+ * @nd_region: hosting region of the free space
+ * @ndd: dimm device data for debug
+ * @label_id: namespace id to allocate space
+ * @prev: potential allocation that precedes free space
+ * @next: allocation that follows the given free space range
+ * @exist: first allocation with same id in the mapping
+ * @n: range that must satisfied for pmem allocations
+ * @valid: free space range to validate
+ *
+ * BLK-space is valid as long as it does not precede a PMEM
+ * allocation in a given region. PMEM-space must be contiguous
+ * and adjacent to an existing existing allocation (if one
+ * exists). If reserving PMEM any space is valid.
+ */
+static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id, struct resource *prev,
+ struct resource *next, struct resource *exist,
+ resource_size_t n, struct resource *valid)
{
- /*
- * For BLK-space any space is valid, for PMEM-space, it must be
- * contiguous with an existing allocation unless we are
- * reserving pmem.
- */
- if (is_reserve || !is_pmem)
- return true;
- if (!res || strcmp(res->name, label_id->id) == 0)
- return true;
- return false;
+ bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
+ bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
+
+ if (valid->start >= valid->end)
+ goto invalid;
+
+ if (is_reserve)
+ return;
+
+ if (!is_pmem) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[0];
+ struct nvdimm_bus *nvdimm_bus;
+ struct blk_alloc_info info = {
+ .nd_mapping = nd_mapping,
+ .available = nd_mapping->size,
+ .res = valid,
+ };
+
+ WARN_ON(!is_nd_blk(&nd_region->dev));
+ nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
+ device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
+ return;
+ }
+
+ /* allocation needs to be contiguous, so this is all or nothing */
+ if (resource_size(valid) < n)
+ goto invalid;
+
+ /* we've got all the space we need and no existing allocation */
+ if (!exist)
+ return;
+
+ /* allocation needs to be contiguous with the existing namespace */
+ if (valid->start == exist->end + 1
+ || valid->end == exist->start - 1)
+ return;
+
+ invalid:
+ /* truncate @valid size to 0 */
+ valid->end = valid->start - 1;
}
enum alloc_loc {
@@ -553,18 +602,24 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
resource_size_t n)
{
resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
- bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct resource *res, *exist = NULL, valid;
const resource_size_t to_allocate = n;
- struct resource *res;
int first;
+ for_each_dpa_resource(ndd, res)
+ if (strcmp(label_id->id, res->name) == 0)
+ exist = res;
+
+ valid.start = nd_mapping->start;
+ valid.end = mapping_end;
+ valid.name = "free space";
retry:
first = 0;
for_each_dpa_resource(ndd, res) {
- resource_size_t allocate, available = 0, free_start, free_end;
struct resource *next = res->sibling, *new_res = NULL;
+ resource_size_t allocate, available = 0;
enum alloc_loc loc = ALLOC_ERR;
const char *action;
int rc = 0;
@@ -577,32 +632,35 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
/* space at the beginning of the mapping */
if (!first++ && res->start > nd_mapping->start) {
- free_start = nd_mapping->start;
- available = res->start - free_start;
- if (space_valid(is_pmem, is_reserve, label_id, NULL))
+ valid.start = nd_mapping->start;
+ valid.end = res->start - 1;
+ space_valid(nd_region, ndd, label_id, NULL, next, exist,
+ to_allocate, &valid);
+ available = resource_size(&valid);
+ if (available)
loc = ALLOC_BEFORE;
}
/* space between allocations */
if (!loc && next) {
- free_start = res->start + resource_size(res);
- free_end = min(mapping_end, next->start - 1);
- if (space_valid(is_pmem, is_reserve, label_id, res)
- && free_start < free_end) {
- available = free_end + 1 - free_start;
+ valid.start = res->start + resource_size(res);
+ valid.end = min(mapping_end, next->start - 1);
+ space_valid(nd_region, ndd, label_id, res, next, exist,
+ to_allocate, &valid);
+ available = resource_size(&valid);
+ if (available)
loc = ALLOC_MID;
- }
}
/* space at the end of the mapping */
if (!loc && !next) {
- free_start = res->start + resource_size(res);
- free_end = mapping_end;
- if (space_valid(is_pmem, is_reserve, label_id, res)
- && free_start < free_end) {
- available = free_end + 1 - free_start;
+ valid.start = res->start + resource_size(res);
+ valid.end = mapping_end;
+ space_valid(nd_region, ndd, label_id, res, next, exist,
+ to_allocate, &valid);
+ available = resource_size(&valid);
+ if (available)
loc = ALLOC_AFTER;
- }
}
if (!loc || !available)
@@ -612,8 +670,6 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_BEFORE:
if (strcmp(res->name, label_id->id) == 0) {
/* adjust current resource up */
- if (is_pmem && !is_reserve)
- return n;
rc = adjust_resource(res, res->start - allocate,
resource_size(res) + allocate);
action = "cur grow up";
@@ -623,8 +679,6 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_MID:
if (strcmp(next->name, label_id->id) == 0) {
/* adjust next resource up */
- if (is_pmem && !is_reserve)
- return n;
rc = adjust_resource(next, next->start
- allocate, resource_size(next)
+ allocate);
@@ -648,12 +702,10 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
if (strcmp(action, "allocate") == 0) {
/* BLK allocate bottom up */
if (!is_pmem)
- free_start += available - allocate;
- else if (!is_reserve && free_start != nd_mapping->start)
- return n;
+ valid.start += available - allocate;
new_res = nvdimm_allocate_dpa(ndd, label_id,
- free_start, allocate);
+ valid.start, allocate);
if (!new_res)
rc = -EBUSY;
} else if (strcmp(action, "grow down") == 0) {
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-17 05:04:14 +0300