BSR (Barrier Synchronization Register) is a IBM POWER-specific
register which can be used for fast synchronization on large systems
without cacheline bouncing. This is a system-wide register and it is
not virtualized or context-switched.
Enable checkpoint and restart of BSR device mappings. It is up to the
user/admin to initialize a job's BSR correctly when restarting or
migrating.
Signed-off-by: Nathan Lynch <ntl@xxxxxxxxx>
---
drivers/char/bsr.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/drivers/char/bsr.c b/drivers/char/bsr.c
index 7fef305..e4ca911 100644
--- a/drivers/char/bsr.c
+++ b/drivers/char/bsr.c
@@ -24,6 +24,7 @@
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/module.h>
+#include <linux/checkpoint.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <linux/mm.h>
@@ -116,6 +117,12 @@ static struct device_attribute bsr_dev_attrs[] = {
__ATTR_NULL
};
+#ifdef CONFIG_CHECKPOINT
+static const struct vm_operations_struct bsr_vm_ops = {
+ .checkpoint = device_vma_checkpoint,
+};
+#endif
+
static int bsr_mmap(struct file *filp, struct vm_area_struct *vma)
{
unsigned long size = vma->vm_end - vma->vm_start;
@@ -138,6 +145,9 @@ static int bsr_mmap(struct file *filp, struct vm_area_struct *vma)
if (ret)
return -EAGAIN;
+#ifdef CONFIG_CHECKPOINT
+ vma->vm_ops = &bsr_vm_ops;
+#endif
return 0;
}
@@ -154,6 +164,9 @@ static const struct file_operations bsr_fops = {
.owner = THIS_MODULE,
.mmap = bsr_mmap,
.open = bsr_open,
+#ifdef CONFIG_CHECKPOINT
+ .checkpoint = generic_file_checkpoint,
+#endif
};
static void bsr_cleanup_devs(void)
--
1.7.2.2
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