diff mbox series

[ndctl,09/10] libdaxctl: add an API to online memory in a non-movable state

Message ID 20191002234925.9190-10-vishal.l.verma@intel.com (mailing list archive)
State Superseded
Commit 52f6fb47c2a7e83f0874e897413c6e6485ab9ffb
Headers show
Series fixes and movability for system-ram mode | expand

Commit Message

Verma, Vishal L Oct. 2, 2019, 11:49 p.m. UTC 
Some users may want additional control over the state in which memory
gets onlined - specifically, controlling the 'movable' aspect of the
resulting memory blocks.

Until now, libdaxctl only brought up memory in the 'movable' state. Add
a new interface to online memory in the non-movable state.

Link: https://github.com/pmem/ndctl/issues/110
Cc: Ben Olson <ben.olson@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 daxctl/lib/libdaxctl-private.h |  6 +++++
 daxctl/lib/libdaxctl.c         | 45 ++++++++++++++++++++++++++++------
 daxctl/lib/libdaxctl.sym       |  1 +
 daxctl/libdaxctl.h             |  1 +
 4 files changed, 46 insertions(+), 7 deletions(-)

Comments

Dan Williams Oct. 18, 2019, 8:54 p.m. UTC | #1 
On Wed, Oct 2, 2019 at 4:49 PM Vishal Verma <vishal.l.verma@intel.com> wrote:
>
> Some users may want additional control over the state in which memory
> gets onlined - specifically, controlling the 'movable' aspect of the
> resulting memory blocks.
>
> Until now, libdaxctl only brought up memory in the 'movable' state. Add
> a new interface to online memory in the non-movable state.
>
> Link: https://github.com/pmem/ndctl/issues/110
> Cc: Ben Olson <ben.olson@intel.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

Looks good to me.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
diff mbox series

Patch

diff --git a/daxctl/lib/libdaxctl-private.h b/daxctl/lib/libdaxctl-private.h
index 82939bb..3e0457f 100644
--- a/daxctl/lib/libdaxctl-private.h
+++ b/daxctl/lib/libdaxctl-private.h
@@ -42,6 +42,7 @@  static const char *dax_modules[] = {
 enum memory_op {
 	MEM_SET_OFFLINE,
 	MEM_SET_ONLINE,
+	MEM_SET_ONLINE_NO_MOVABLE,
 	MEM_IS_ONLINE,
 	MEM_COUNT,
 	MEM_FIND_ZONE,
@@ -65,6 +66,11 @@  static const char *zone_strings[] = {
 	[MEM_ZONE_MOVABLE] = "Movable",
 };
 
+static const char *state_strings[] = {
+	[MEM_ZONE_NORMAL] = "online",
+	[MEM_ZONE_MOVABLE] = "online_movable",
+};
+
 /**
  * struct daxctl_region - container for dax_devices
  */
diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c
index 5a7e37c..d913807 100644
--- a/daxctl/lib/libdaxctl.c
+++ b/daxctl/lib/libdaxctl.c
@@ -1080,11 +1080,10 @@  static int memblock_is_online(struct daxctl_memory *mem, char *memblock)
 }
 
 static int online_one_memblock(struct daxctl_memory *mem, char *memblock,
-		int *status)
+		enum memory_zones zone, int *status)
 {
 	struct daxctl_dev *dev = daxctl_memory_get_dev(mem);
 	struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev);
-	const char *mode = "online_movable";
 	int len = mem->buf_len, rc;
 	char *path = mem->mem_buf;
 	const char *node_path;
@@ -1101,7 +1100,14 @@  static int online_one_memblock(struct daxctl_memory *mem, char *memblock,
 	if (rc)
 		return rc;
 
-	rc = sysfs_write_attr_quiet(ctx, path, mode);
+	switch (zone) {
+	case MEM_ZONE_MOVABLE:
+	case MEM_ZONE_NORMAL:
+		rc = sysfs_write_attr_quiet(ctx, path, state_strings[zone]);
+		break;
+	default:
+		rc = -EINVAL;
+	}
 	if (rc) {
 		/*
 		 * If the block got onlined, potentially by some other agent,
@@ -1266,7 +1272,11 @@  static int op_for_one_memblock(struct daxctl_memory *mem, char *memblock,
 
 	switch (op) {
 	case MEM_SET_ONLINE:
-		return online_one_memblock(mem, memblock, status);
+		return online_one_memblock(mem, memblock, MEM_ZONE_MOVABLE,
+				status);
+	case MEM_SET_ONLINE_NO_MOVABLE:
+		return online_one_memblock(mem, memblock, MEM_ZONE_NORMAL,
+				status);
 	case MEM_SET_OFFLINE:
 		return offline_one_memblock(mem, memblock);
 	case MEM_IS_ONLINE:
@@ -1344,14 +1354,25 @@  out_dir:
 /*
  * daxctl_memory_online() will online to ZONE_MOVABLE by default
  */
-DAXCTL_EXPORT int daxctl_memory_online(struct daxctl_memory *mem)
+static int daxctl_memory_online_with_zone(struct daxctl_memory *mem,
+		enum memory_zones zone)
 {
 	struct daxctl_dev *dev = daxctl_memory_get_dev(mem);
 	const char *devname = daxctl_dev_get_devname(dev);
 	struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev);
 	int rc;
 
-	rc = daxctl_memory_op(mem, MEM_SET_ONLINE);
+	switch (zone) {
+	case MEM_ZONE_MOVABLE:
+		rc = daxctl_memory_op(mem, MEM_SET_ONLINE);
+		break;
+	case MEM_ZONE_NORMAL:
+		rc = daxctl_memory_op(mem, MEM_SET_ONLINE_NO_MOVABLE);
+		break;
+	default:
+		err(ctx, "%s: BUG: invalid zone for onlining\n", devname);
+		rc = -EINVAL;
+	}
 	if (rc)
 		return rc;
 
@@ -1364,7 +1385,7 @@  DAXCTL_EXPORT int daxctl_memory_online(struct daxctl_memory *mem)
 	rc = daxctl_memory_op(mem, MEM_FIND_ZONE);
 	if (rc)
 		return rc;
-	if (mem->zone != MEM_ZONE_MOVABLE) {
+	if (mem->zone != zone) {
 		err(ctx,
 		    "%s:\n  WARNING: detected a race while onlining memory\n"
 		    "  Some memory may not be in the expected zone. It is\n"
@@ -1378,6 +1399,16 @@  DAXCTL_EXPORT int daxctl_memory_online(struct daxctl_memory *mem)
 	return rc;
 }
 
+DAXCTL_EXPORT int daxctl_memory_online(struct daxctl_memory *mem)
+{
+	return daxctl_memory_online_with_zone(mem, MEM_ZONE_MOVABLE);
+}
+
+DAXCTL_EXPORT int daxctl_memory_online_no_movable(struct daxctl_memory *mem)
+{
+	return daxctl_memory_online_with_zone(mem, MEM_ZONE_NORMAL);
+}
+
 DAXCTL_EXPORT int daxctl_memory_offline(struct daxctl_memory *mem)
 {
 	return daxctl_memory_op(mem, MEM_SET_OFFLINE);
diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym
index 041d9a5..87d0236 100644
--- a/daxctl/lib/libdaxctl.sym
+++ b/daxctl/lib/libdaxctl.sym
@@ -73,4 +73,5 @@  global:
 LIBDAXCTL_7 {
 global:
 	daxctl_memory_is_movable;
+	daxctl_memory_online_no_movable;
 } LIBDAXCTL_6;
diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h
index 8d5f8b7..6c545e1 100644
--- a/daxctl/libdaxctl.h
+++ b/daxctl/libdaxctl.h
@@ -85,6 +85,7 @@  int daxctl_memory_offline(struct daxctl_memory *mem);
 int daxctl_memory_is_online(struct daxctl_memory *mem);
 int daxctl_memory_num_sections(struct daxctl_memory *mem);
 int daxctl_memory_is_movable(struct daxctl_memory *mem);
+int daxctl_memory_online_no_movable(struct daxctl_memory *mem);
 
 #define daxctl_dev_foreach(region, dev) \
         for (dev = daxctl_dev_get_first(region); \