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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 12:36:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 12:36:49 -0800
commitd4220f987cf473c65a342ca69e3eb13dea919a49 (patch)
treedbb004a9c805d6de3f6e3955398fee1084a29f16 /drivers
parent61cf693159d6a968a7014e24905143f71ed8ddcf (diff)
parentf2c03debdfb387fa2e35cac6382779072b8b9209 (diff)
Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6
* 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6: (34 commits) HWPOISON: Remove stray phrase in a comment HWPOISON: Try to allocate migration page on the same node HWPOISON: Don't do early filtering if filter is disabled HWPOISON: Add a madvise() injector for soft page offlining HWPOISON: Add soft page offline support HWPOISON: Undefine short-hand macros after use to avoid namespace conflict HWPOISON: Use new shake_page in memory_failure HWPOISON: Use correct name for MADV_HWPOISON in documentation HWPOISON: mention HWPoison in Kconfig entry HWPOISON: Use get_user_page_fast in hwpoison madvise HWPOISON: add an interface to switch off/on all the page filters HWPOISON: add memory cgroup filter memcg: add accessor to mem_cgroup.css memcg: rename and export try_get_mem_cgroup_from_page() HWPOISON: add page flags filter mm: export stable page flags HWPOISON: limit hwpoison injector to known page types HWPOISON: add fs/device filters HWPOISON: return 0 to indicate success reliably HWPOISON: make semantics of IGNORED/DELAYED clear ...
Diffstat (limited to 'drivers')
-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;