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Diffstat (limited to 'drivers/base/memory.c')
-rw-r--r--drivers/base/memory.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 989429cfed8..c4c8f2e1dd1 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -341,6 +341,64 @@ static inline int memory_probe_init(void)
}
#endif
+#ifdef CONFIG_MEMORY_FAILURE
+/*
+ * Support for offlining pages of memory
+ */
+
+/* Soft offline a page */
+static ssize_t
+store_soft_offline_page(struct class *class, const char *buf, size_t count)
+{
+ int ret;
+ u64 pfn;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (strict_strtoull(buf, 0, &pfn) < 0)
+ return -EINVAL;
+ pfn >>= PAGE_SHIFT;
+ if (!pfn_valid(pfn))
+ return -ENXIO;
+ ret = soft_offline_page(pfn_to_page(pfn), 0);
+ return ret == 0 ? count : ret;
+}
+
+/* Forcibly offline a page, including killing processes. */
+static ssize_t
+store_hard_offline_page(struct class *class, const char *buf, size_t count)
+{
+ int ret;
+ u64 pfn;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (strict_strtoull(buf, 0, &pfn) < 0)
+ return -EINVAL;
+ pfn >>= PAGE_SHIFT;
+ ret = __memory_failure(pfn, 0, 0);
+ return ret ? ret : count;
+}
+
+static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
+static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
+
+static __init int memory_fail_init(void)
+{
+ int err;
+
+ err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
+ &class_attr_soft_offline_page.attr);
+ if (!err)
+ err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
+ &class_attr_hard_offline_page.attr);
+ return err;
+}
+#else
+static inline int memory_fail_init(void)
+{
+ return 0;
+}
+#endif
+
/*
* Note that phys_device is optional. It is here to allow for
* differentiation between which *physical* devices each
@@ -473,6 +531,9 @@ int __init memory_dev_init(void)
err = memory_probe_init();
if (!ret)
ret = err;
+ err = memory_fail_init();
+ if (!ret)
+ ret = err;
err = block_size_init();
if (!ret)
ret = err;