Add support of cxl lsa 2.1 using NDD_CXL_LABEL flag. It also creates cxl
region based on region information parsed from LSA.
Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
---
drivers/cxl/core/region.c | 58 +++++++++++++++++++++++++++++++++++++++
drivers/cxl/cxl.h | 4 +++
drivers/cxl/pmem.c | 2 ++
3 files changed, 64 insertions(+)
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 8578e046aa78..19ccdd136da0 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2665,6 +2665,64 @@ static ssize_t create_ram_region_show(struct device *dev,
return __create_region_show(to_cxl_root_decoder(dev), buf);
}
+static int match_free_ep_decoder(struct device *dev, const void *data)
+{
+ struct cxl_decoder *cxld = to_cxl_decoder(dev);
+
+ return !cxld->region;
+}
+
+static struct cxl_decoder *cxl_find_free_ep_decoder(struct cxl_port *port)
+{
+ struct device *dev;
+
+ dev = device_find_child(&port->dev, NULL, match_free_ep_decoder);
+ if (!dev)
+ return NULL;
+
+ /* Release device ref taken via device_find_child() */
+ put_device(dev);
+ return to_cxl_decoder(dev);
+}
+
+void create_pmem_region(struct nvdimm *nvdimm)
+{
+ struct cxl_nvdimm *cxl_nvd;
+ struct cxl_memdev *cxlmd;
+ struct cxl_nvdimm_bridge *cxl_nvb;
+ struct cxl_pmem_region_params *params;
+ struct cxl_root_decoder *cxlrd;
+ struct cxl_decoder *cxld;
+ struct cxl_region *cxlr;
+
+ if (!nvdimm_has_cxl_region(nvdimm))
+ return;
+
+ lockdep_assert_held(&cxl_rwsem.region);
+ cxl_nvd = nvdimm_provider_data(nvdimm);
+ params = nvdimm_get_cxl_region_param(nvdimm);
+ cxlmd = cxl_nvd->cxlmd;
+ cxl_nvb = cxlmd->cxl_nvb;
+ cxlrd = cxlmd->cxlrd;
+
+ /*
+ * FIXME: Limitation: Region creation support only for
+ * interleave way == 1
+ */
+ if (!(params->nlabel == 1))
+ dev_info(&cxlmd->dev,
+ "Region Creation is not supported with iw > 1\n");
+ else {
+ cxld = cxl_find_free_ep_decoder(cxlmd->endpoint);
+ cxlr = cxl_create_region(cxlrd, CXL_PARTMODE_PMEM,
+ atomic_read(&cxlrd->region_id),
+ params, cxld);
+ if (IS_ERR(cxlr))
+ dev_info(&cxlmd->dev, "Region Creation failed\n");
+ }
+}
+EXPORT_SYMBOL_NS_GPL(create_pmem_region, "CXL");
+
struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
enum cxl_partition_mode mode, int id,
struct cxl_pmem_region_params *params,
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index e249372b642d..51c56069f451 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -870,6 +870,7 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
enum cxl_partition_mode mode, int id,
struct cxl_pmem_region_params *params,
struct cxl_decoder *cxld);
+void create_pmem_region(struct nvdimm *nvdimm);
#else
static inline bool is_cxl_pmem_region(struct device *dev)
{
@@ -903,6 +904,9 @@ cxl_create_region(struct cxl_root_decoder *cxlrd,
{
return NULL;
}
+static inline void create_pmem_region(struct nvdimm *nvdimm)
+{
+}
#endif
void cxl_endpoint_parse_cdat(struct cxl_port *port);
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 38a5bcdc68ce..4a7428a5a82c 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -135,6 +135,7 @@ static int cxl_nvdimm_probe(struct device *dev)
return rc;
set_bit(NDD_LABELING, &flags);
+ set_bit(NDD_CXL_LABEL, &flags);
set_bit(NDD_REGISTER_SYNC, &flags);
set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
@@ -155,6 +156,7 @@ static int cxl_nvdimm_probe(struct device *dev)
return -ENOMEM;
dev_set_drvdata(dev, nvdimm);
+ create_pmem_region(nvdimm);
return devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm);
}
--
2.34.1