mm: Add DDR and HBM to nodes by cmdline

euler inclusion
category: feature
bugzilla: 11082
CVE: NA
---------------------

When the kernel boot, we need to determine DDR or HBM,
and add them to nodes by parse cmdline, instead of memory hotplug.
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: Nzhong jiang <zhongjiang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

Documentation/admin-guide/kernel-parameters.txt

@@ -475,6 +475,12 @@
 	ccw_timeout_log	[S390]
 			See Documentation/s390/CommonIO for details.
 
+	cdm-nodes=      [KNL]
+			Format: hexadecimal expression
+			One bit express one node, if the node is HBM, set the
+			bit to 1. Then transform Binary to hexadecimal.
+			Example: node1, node2 is HBM, cdm-nodes=0x06.
+
 	cgroup_disable=	[KNL] Disable a particular controller
 			Format: {name of the controller(s) to disable}
 			The effects of cgroup_disable=foo are:

arch/arm64/include/asm/numa.h

@@ -19,6 +19,9 @@ extern bool numa_off;
 extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
 void numa_clear_node(unsigned int cpu);
 
+#ifdef CONFIG_COHERENT_DEVICE
+extern nodemask_t cdmmask;
+#endif
 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 const struct cpumask *cpumask_of_node(int node);
 #else

arch/arm64/mm/numa.c

@@ -38,10 +38,30 @@ static u8 *numa_distance;
 bool numa_off;
 
 #ifdef CONFIG_COHERENT_DEVICE
+nodemask_t cdmmask;
+
 inline int arch_check_node_cdm(int nid)
 {
+	return node_isset(nid, cdmmask);
+}
+
+static int __init cdm_nodes_setup(char *s)
+{
+	int nid;
+	unsigned long tmpmask;
+	int err;
+
+	err = kstrtoul(s, 0, &tmpmask);
+	if (err)
+		return err;
+
+	for (nid = 0; nid < MAX_NUMNODES; nid++) {
+		if ((tmpmask >> nid) & 1)
+			node_set(nid, cdmmask);
+	}
 	return 0;
 }
+early_param("cdm-nodes", cdm_nodes_setup);
 #endif
 
 static __init int numa_parse_early_param(char *opt)