[ndctl PATCH v2 3/6] ndctl: Separate region mode from decoder mode

[Ira Weiny <ira.weiny@intel.com>]

With the introduction of DCD, region mode and decoder mode no longer
remain a 1:1 relation.  An interleaved region may be made up of Dynamic
Capacity partitions with different indexes on each of the target
devices.

Introduce a new region mode enumeration and access function.

To maintain compatibility with existing software the region mode values
are defined the same as the current decoder mode.  In addition
cxl_region_get_mode() is retained.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 cxl/json.c         |  6 +++---
 cxl/lib/libcxl.c   | 15 ++++++++++-----
 cxl/lib/libcxl.sym |  1 +
 cxl/lib/private.h  |  2 +-
 cxl/libcxl.h       | 35 +++++++++++++++++++++++++++++++++++
 5 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/cxl/json.c b/cxl/json.c
index 5066d3bed13f8fcc36ab8f0ea127685c246d94d7..dcd3cc28393faf7e8adf299a857531ecdeaac50a 100644
--- a/cxl/json.c
+++ b/cxl/json.c
@@ -1147,7 +1147,7 @@ void util_cxl_mappings_append_json(struct json_object *jregion,
 struct json_object *util_cxl_region_to_json(struct cxl_region *region,
 					     unsigned long flags)
 {
-	enum cxl_decoder_mode mode = cxl_region_get_mode(region);
+	enum cxl_region_mode mode = cxl_region_get_region_mode(region);
 	const char *devname = cxl_region_get_devname(region);
 	struct json_object *jregion, *jobj;
 	u64 val;
@@ -1174,8 +1174,8 @@ struct json_object *util_cxl_region_to_json(struct cxl_region *region,
 			json_object_object_add(jregion, "size", jobj);
 	}
 
-	if (mode != CXL_DECODER_MODE_NONE) {
-		jobj = json_object_new_string(cxl_decoder_mode_name(mode));
+	if (mode != CXL_REGION_MODE_NONE) {
+		jobj = json_object_new_string(cxl_region_mode_name(mode));
 		if (jobj)
 			json_object_object_add(jregion, "type", jobj);
 	}
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 63aa4ef3acdc2fb3c4ec6c13be5feb802e817d0d..5cbfb3e7d466b491ef87ea285f7e50d3bac230db 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -431,10 +431,10 @@ CXL_EXPORT bool cxl_region_qos_class_mismatch(struct cxl_region *region)
 		if (!memdev)
 			continue;
 
-		if (region->mode == CXL_DECODER_MODE_RAM) {
+		if (region->mode == CXL_REGION_MODE_RAM) {
 			if (root_decoder->qos_class != memdev->ram_qos_class)
 				return true;
-		} else if (region->mode == CXL_DECODER_MODE_PMEM) {
+		} else if (region->mode == CXL_REGION_MODE_PMEM) {
 			if (root_decoder->qos_class != memdev->pmem_qos_class)
 				return true;
 		}
@@ -619,9 +619,9 @@ static void *add_cxl_region(void *parent, int id, const char *cxlregion_base)
 
 	sprintf(path, "%s/mode", cxlregion_base);
 	if (sysfs_read_attr(ctx, path, buf) < 0)
-		region->mode = CXL_DECODER_MODE_NONE;
+		region->mode = CXL_REGION_MODE_NONE;
 	else
-		region->mode = cxl_decoder_mode_from_ident(buf);
+		region->mode = cxl_region_mode_from_ident(buf);
 
 	sprintf(path, "%s/modalias", cxlregion_base);
 	if (sysfs_read_attr(ctx, path, buf) == 0)
@@ -748,11 +748,16 @@ CXL_EXPORT unsigned long long cxl_region_get_resource(struct cxl_region *region)
 	return region->start;
 }
 
-CXL_EXPORT enum cxl_decoder_mode cxl_region_get_mode(struct cxl_region *region)
+CXL_EXPORT enum cxl_region_mode cxl_region_get_region_mode(struct cxl_region *region)
 {
 	return region->mode;
 }
 
+CXL_EXPORT enum cxl_decoder_mode cxl_region_get_mode(struct cxl_region *region)
+{
+	return (enum cxl_decoder_mode)cxl_region_get_region_mode(region);
+}
+
 CXL_EXPORT unsigned int
 cxl_region_get_interleave_ways(struct cxl_region *region)
 {
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 0c155a40ad4765106f0eab1745281d462af782fe..b5d9bdcc38e09812f26afc1cb0e804f86784b8e6 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -287,4 +287,5 @@ LIBECXL_8 {
 global:
 	cxl_memdev_trigger_poison_list;
 	cxl_region_trigger_poison_list;
+	cxl_region_get_region_mode;
 } LIBCXL_7;
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index b6cd910e93359b53cac34427acfe84c7abcb78b0..0f45be89b6a00477d13fb6d7f1906213a3073c48 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -171,7 +171,7 @@ struct cxl_region {
 	unsigned int interleave_ways;
 	unsigned int interleave_granularity;
 	enum cxl_decode_state decode_state;
-	enum cxl_decoder_mode mode;
+	enum cxl_region_mode mode;
 	struct daxctl_region *dax_region;
 	struct kmod_module *module;
 	struct list_head mappings;
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index 0a5fd0e13cc24e0032d4a83d780278fbe0038d32..06b87a0924faafec6c80eca83ea7551d4e117256 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -303,6 +303,39 @@ int cxl_memdev_is_enabled(struct cxl_memdev *memdev);
 	for (endpoint = cxl_endpoint_get_first(port); endpoint != NULL;        \
 	     endpoint = cxl_endpoint_get_next(endpoint))
 
+enum cxl_region_mode {
+	CXL_REGION_MODE_NONE = CXL_DECODER_MODE_NONE,
+	CXL_REGION_MODE_MIXED = CXL_DECODER_MODE_MIXED,
+	CXL_REGION_MODE_PMEM = CXL_DECODER_MODE_PMEM,
+	CXL_REGION_MODE_RAM = CXL_DECODER_MODE_RAM,
+};
+
+static inline const char *cxl_region_mode_name(enum cxl_region_mode mode)
+{
+	static const char *names[] = {
+		[CXL_REGION_MODE_NONE] = "none",
+		[CXL_REGION_MODE_MIXED] = "mixed",
+		[CXL_REGION_MODE_PMEM] = "pmem",
+		[CXL_REGION_MODE_RAM] = "ram",
+	};
+
+	if (mode < CXL_REGION_MODE_NONE || mode > CXL_REGION_MODE_RAM)
+		mode = CXL_REGION_MODE_NONE;
+	return names[mode];
+}
+
+static inline enum cxl_region_mode
+cxl_region_mode_from_ident(const char *ident)
+{
+	if (strcmp(ident, "ram") == 0)
+		return CXL_REGION_MODE_RAM;
+	else if (strcmp(ident, "volatile") == 0)
+		return CXL_REGION_MODE_RAM;
+	else if (strcmp(ident, "pmem") == 0)
+		return CXL_REGION_MODE_PMEM;
+	return CXL_REGION_MODE_NONE;
+}
+
 struct cxl_region;
 struct cxl_region *cxl_region_get_first(struct cxl_decoder *decoder);
 struct cxl_region *cxl_region_get_next(struct cxl_region *region);
@@ -318,6 +351,8 @@ const char *cxl_region_get_devname(struct cxl_region *region);
 void cxl_region_get_uuid(struct cxl_region *region, uuid_t uu);
 unsigned long long cxl_region_get_size(struct cxl_region *region);
 unsigned long long cxl_region_get_resource(struct cxl_region *region);
+enum cxl_region_mode cxl_region_get_region_mode(struct cxl_region *region);
+/* Deprecated: use cxl_region_get_region_mode() */
 enum cxl_decoder_mode cxl_region_get_mode(struct cxl_region *region);
 unsigned int cxl_region_get_interleave_ways(struct cxl_region *region);
 unsigned int cxl_region_get_interleave_granularity(struct cxl_region *region);

-- 
2.47.0