meminfo: Show reliable memory info

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

--------------------------------

Add ReliMemTotal & ReliMemUsed in /proc/meminfo to show memory info about
reliable memory.

- ReliableTotal: total reliable RAM

- ReliableUsed: thei used amount of reliable memory kernel
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

Documentation/filesystems/proc.txt

@@ -880,6 +880,8 @@ HardwareCorrupted:   0 kB
 AnonHugePages:   49152 kB
 ShmemHugePages:      0 kB
 ShmemPmdMapped:      0 kB
+ReliableTotal:     7340032 kB
+ReliableUsed:       418824 kB
 
 
     MemTotal: Total usable ram (i.e. physical ram minus a few reserved
@@ -970,6 +972,8 @@ VmallocTotal: total size of vmalloc memory area
 VmallocChunk: largest contiguous block of vmalloc area which is free
       Percpu: Memory allocated to the percpu allocator used to back percpu
               allocations. This stat excludes the cost of metadata.
+ReliableTotal: Total reliable memory size
+ReliableUsed:  The used amount of reliable memory
 
 ..............................................................................
 

fs/proc/meminfo.c

@@ -148,6 +148,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 
 	arch_report_meminfo(m);
 
+	reliable_report_meminfo(m);
+
 	return 0;
 }
 

include/linux/mem_reliable.h

@@ -18,6 +18,7 @@ extern bool reliable_enabled;
 extern void add_reliable_mem_size(long sz);
 extern void mem_reliable_init(bool has_unmirrored_mem,
 			      unsigned long *zone_movable_pfn);
+extern void reliable_report_meminfo(struct seq_file *m);
 
 static inline bool mem_reliable_is_enabled(void)
 {
@@ -58,6 +59,7 @@ static inline bool skip_none_movable_zone(gfp_t gfp, struct zoneref *z)
 {
 	return false;
 }
+static inline void reliable_report_meminfo(struct seq_file *m) {}
 
 #endif
 

mm/mem_reliable.c

@@ -6,6 +6,8 @@
 #include <linux/mm.h>
 #include <linux/memory.h>
 #include <linux/memory_hotplug.h>
+#include <linux/seq_file.h>
+#include <linux/mmzone.h>
 
 DEFINE_STATIC_KEY_FALSE(mem_reliable);
 
@@ -76,3 +78,30 @@ void mem_reliable_init(bool has_unmirrored_mem, unsigned long *zone_movable_pfn)
 	pr_info("init succeed, mirrored memory size(%lu)",
 		atomic_long_read(&total_reliable_mem));
 }
+
+static unsigned long total_reliable_mem_sz(void)
+{
+	return atomic_long_read(&total_reliable_mem);
+}
+
+static unsigned long used_reliable_mem_sz(void)
+{
+	unsigned long nr_page = 0;
+	struct zone *z;
+
+	for_each_populated_zone(z)
+		if (zone_idx(z) < ZONE_MOVABLE)
+			nr_page += zone_page_state(z, NR_FREE_PAGES);
+
+	return total_reliable_mem_sz() - nr_page * PAGE_SIZE;
+}
+
+void reliable_report_meminfo(struct seq_file *m)
+{
+	if (mem_reliable_is_enabled()) {
+		seq_printf(m, "ReliableTotal:    %8lu kB\n",
+			   total_reliable_mem_sz() >> 10);
+		seq_printf(m, "ReliableUsed:     %8lu kB\n",
+			   used_reliable_mem_sz() >> 10);
+	}
+}