4 files changed, 80 insertions, 0 deletions

diff --git a/drivers/cxl/core/cdat.c b/drivers/cxl/core/cdat.c
index 40052666ebf1..ee1bc8fa396b 100644
--- a/drivers/cxl/core/cdat.c
+++ b/drivers/cxl/core/cdat.c
@@ -580,3 +580,9 @@ void cxl_region_perf_data_calculate(struct cxl_region *cxlr,
 			DIV_ROUND_UP(cxlr->coord[i].write_latency, 1000);
 	}
 }
+
+int cxl_update_hmat_access_coordinates(int nid, struct cxl_region *cxlr,
+				       enum access_coordinate_class access)
+{
+	return hmat_update_target_coordinates(nid, &cxlr->coord[access], access);
+}
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 3b64fb1b9ed0..e19800a7ce06 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -90,4 +90,7 @@ enum cxl_poison_trace_type {
 
 long cxl_pci_get_latency(struct pci_dev *pdev);
 
+int cxl_update_hmat_access_coordinates(int nid, struct cxl_region *cxlr,
+				       enum access_coordinate_class access);
+
 #endif /* __CXL_CORE_H__ */
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index d4d39536e6c7..535492ec8529 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -4,6 +4,7 @@
 #include <linux/genalloc.h>
 #include <linux/device.h>
 #include <linux/module.h>
+#include <linux/memory.h>
 #include <linux/slab.h>
 #include <linux/uuid.h>
 #include <linux/sort.h>
@@ -116,12 +117,22 @@ static const struct attribute_group cxl_region_access0_coordinate_group = {
 	.is_visible = cxl_region_access0_coordinate_visible,
 };
 
+static const struct attribute_group *get_cxl_region_access0_group(void)
+{
+	return &cxl_region_access0_coordinate_group;
+}
+
 static const struct attribute_group cxl_region_access1_coordinate_group = {
 	.name = "access1",
 	.attrs = access1_coordinate_attrs,
 	.is_visible = cxl_region_access1_coordinate_visible,
 };
 
+static const struct attribute_group *get_cxl_region_access1_group(void)
+{
+	return &cxl_region_access1_coordinate_group;
+}
+
 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
@@ -2216,6 +2227,7 @@ static void unregister_region(void *_cxlr)
 	struct cxl_region_params *p = &cxlr->params;
 	int i;
 
+	unregister_memory_notifier(&cxlr->memory_notifier);
 	device_del(&cxlr->dev);
 
 	/*
@@ -2260,6 +2272,58 @@ static struct cxl_region *cxl_region_alloc(struct cxl_root_decoder *cxlrd, int i
 	return cxlr;
 }
 
+static bool cxl_region_update_coordinates(struct cxl_region *cxlr, int nid)
+{
+	int cset = 0;
+	int rc;
+
+	for (int i = 0; i < ACCESS_COORDINATE_MAX; i++) {
+		if (cxlr->coord[i].read_bandwidth) {
+			rc = cxl_update_hmat_access_coordinates(nid, cxlr, i);
+			if (rc == 0)
+				cset++;
+		}
+	}
+
+	if (!cset)
+		return false;
+
+	rc = sysfs_update_group(&cxlr->dev.kobj, get_cxl_region_access0_group());
+	if (rc)
+		dev_dbg(&cxlr->dev, "Failed to update access0 group\n");
+
+	rc = sysfs_update_group(&cxlr->dev.kobj, get_cxl_region_access1_group());
+	if (rc)
+		dev_dbg(&cxlr->dev, "Failed to update access1 group\n");
+
+	return true;
+}
+
+static int cxl_region_perf_attrs_callback(struct notifier_block *nb,
+					  unsigned long action, void *arg)
+{
+	struct cxl_region *cxlr = container_of(nb, struct cxl_region,
+					       memory_notifier);
+	struct cxl_region_params *p = &cxlr->params;
+	struct cxl_endpoint_decoder *cxled = p->targets[0];
+	struct cxl_decoder *cxld = &cxled->cxld;
+	struct memory_notify *mnb = arg;
+	int nid = mnb->status_change_nid;
+	int region_nid;
+
+	if (nid == NUMA_NO_NODE || action != MEM_ONLINE)
+		return NOTIFY_DONE;
+
+	region_nid = phys_to_target_node(cxld->hpa_range.start);
+	if (nid != region_nid)
+		return NOTIFY_DONE;
+
+	if (!cxl_region_update_coordinates(cxlr, nid))
+		return NOTIFY_DONE;
+
+	return NOTIFY_OK;
+}
+
 /**
  * devm_cxl_add_region - Adds a region to a decoder
  * @cxlrd: root decoder
@@ -2307,6 +2371,10 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd,
 	if (rc)
 		goto err;
 
+	cxlr->memory_notifier.notifier_call = cxl_region_perf_attrs_callback;
+	cxlr->memory_notifier.priority = CXL_CALLBACK_PRI;
+	register_memory_notifier(&cxlr->memory_notifier);
+
 	rc = devm_add_action_or_reset(port->uport_dev, unregister_region, cxlr);
 	if (rc)
 		return ERR_PTR(rc);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 95864ce7b394..534e25e2f0a4 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -6,6 +6,7 @@
 
 #include <linux/libnvdimm.h>
 #include <linux/bitfield.h>
+#include <linux/notifier.h>
 #include <linux/bitops.h>
 #include <linux/log2.h>
 #include <linux/node.h>
@@ -518,6 +519,7 @@ struct cxl_region_params {
  * @flags: Region state flags
  * @params: active + config params for the region
  * @coord: QoS access coordinates for the region
+ * @memory_notifier: notifier for setting the access coordinates to node
  */
 struct cxl_region {
 	struct device dev;
@@ -529,6 +531,7 @@ struct cxl_region {
 	unsigned long flags;
 	struct cxl_region_params params;
 	struct access_coordinate coord[ACCESS_COORDINATE_MAX];
+	struct notifier_block memory_notifier;
 };
 
 struct cxl_nvdimm_bridge {