@@ -75,6 +75,14 @@ daxctl_dev_get_target_node() or 'daxctl list')
# numactl --cpunodebind=0-1 --membind=2 -- some-service --opt1 --opt2
----
+* Change the size of a dax device
+----
+# daxctl reconfigure-device dax0.1 -s 16G
+reconfigured 1 device
+# daxctl reconfigure-device dax0.1 -s 0
+reconfigured 1 device
+----
+
DESCRIPTION
-----------
@@ -120,6 +128,14 @@ OPTIONS
more /dev/daxX.Y devices, where X is the region id and Y is the device
instance id.
+-s::
+--size=::
+ For regions that support dax device creation, change the device size
+ in bytes. This option supports the suffixes "k" or "K" for KiB, "m" or
+ "M" for MiB, "g" or "G" for GiB and "t" or "T" for TiB.
+
+ The size must be a multiple of the region alignment.
+
-m::
--mode=::
Specify the mode to which the dax device(s) should be reconfigured.
@@ -9,6 +9,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
+#include <util/size.h>
#include <util/json.h>
#include <util/filter.h>
#include <json-c/json.h>
@@ -20,6 +21,7 @@ static struct {
const char *dev;
const char *mode;
const char *region;
+ const char *size;
bool no_online;
bool no_movable;
bool force;
@@ -34,6 +36,7 @@ enum dev_mode {
};
static enum dev_mode reconfig_mode = DAXCTL_DEV_MODE_UNKNOWN;
+static long long size = -1;
static unsigned long flags;
enum memory_zone {
@@ -60,12 +63,16 @@ OPT_BOOLEAN('N', "no-online", ¶m.no_online, \
OPT_BOOLEAN('f', "force", ¶m.force, \
"attempt to offline memory sections before reconfiguration")
+#define CREATE_OPTIONS() \
+OPT_STRING('s', "size", ¶m.size, "size", "size to switch the device to")
+
#define ZONE_OPTIONS() \
OPT_BOOLEAN('\0', "no-movable", ¶m.no_movable, \
"online memory in ZONE_NORMAL")
static const struct option reconfig_options[] = {
BASE_OPTIONS(),
+ CREATE_OPTIONS(),
RECONFIG_OPTIONS(),
ZONE_OPTIONS(),
OPT_END(),
@@ -90,6 +97,7 @@ static const char *parse_device_options(int argc, const char **argv,
usage,
NULL
};
+ unsigned long long units = 1;
int i, rc = 0;
argc = parse_options(argc, argv, options, u, 0);
@@ -135,12 +143,14 @@ static const char *parse_device_options(int argc, const char **argv,
/* Handle action-specific options */
switch (action) {
case ACTION_RECONFIG:
- if (!param.mode) {
- fprintf(stderr, "error: a 'mode' option is required\n");
+ if (!param.size && !param.mode) {
+ fprintf(stderr, "error: a 'mode' or 'size' option is required\n");
usage_with_options(u, reconfig_options);
rc = -EINVAL;
}
- if (strcmp(param.mode, "system-ram") == 0) {
+ if (param.size) {
+ size = __parse_size64(param.size, &units);
+ } else if (strcmp(param.mode, "system-ram") == 0) {
reconfig_mode = DAXCTL_DEV_MODE_RAM;
if (param.no_movable)
mem_zone = MEM_ZONE_NORMAL;
@@ -309,6 +319,17 @@ static int dev_offline_memory(struct daxctl_dev *dev)
return 0;
}
+static int dev_resize(struct daxctl_dev *dev, unsigned long long val)
+{
+ int rc;
+
+ rc = daxctl_dev_set_size(dev, val);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+
static int disable_devdax_device(struct daxctl_dev *dev)
{
struct daxctl_memory *mem = daxctl_dev_get_memory(dev);
@@ -418,6 +439,11 @@ static int do_reconfig(struct daxctl_dev *dev, enum dev_mode mode,
struct json_object *jdev;
int rc = 0;
+ if (size >= 0) {
+ rc = dev_resize(dev, size);
+ return rc;
+ }
+
switch (mode) {
case DAXCTL_DEV_MODE_RAM:
rc = reconfig_mode_system_ram(dev);