[PATCH RFC 6/8] powerpc/64: barrier_nospec: Add debugfs trigger

[Michal Suchanek]

Copypasta from rfi implementation

Signed-off-by: Michal Suchanek 
---
 arch/powerpc/kernel/setup_64.c | 35 +++
 1 file changed, 35 insertions(+)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index d1d9f047161e..4b67b7b877d9 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -955,6 +955,41 @@ static __init int rfi_flush_debugfs_init(void)
return 0;
 }
 device_initcall(rfi_flush_debugfs_init);
+
+static int barrier_nospec_set(void *data, u64 val)
+{
+   switch (val) {
+   case 0:
+   case 1:
+   break;
+   default:
+   return -EINVAL;
+   }
+
+   if (!!val == !!barrier_nospec_enabled)
+   return 0;
+
+   barrier_nospec_enable(!!val);
+
+   return 0;
+}
+
+static int barrier_nospec_get(void *data, u64 *val)
+{
+   *val = barrier_nospec_enabled ? 1 : 0;
+   return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_barrier_nospec,
+   barrier_nospec_get, barrier_nospec_set, "%llu\n");
+
+static __init int barrier_nospec_debugfs_init(void)
+{
+   debugfs_create_file("barrier_nospec", 0600, powerpc_debugfs_root, NULL,
+   _barrier_nospec);
+   return 0;
+}
+device_initcall(barrier_nospec_debugfs_init);
 #endif
 
 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, 
char *buf)
-- 
2.13.6

[PATCH RFC 6/8] powerpc/64: barrier_nospec: Add debugfs trigger

[Michal Suchanek]

Copypasta from rfi implementation

Signed-off-by: Michal Suchanek 
---
 arch/powerpc/kernel/setup_64.c | 35 +++
 1 file changed, 35 insertions(+)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index d1d9f047161e..4b67b7b877d9 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -955,6 +955,41 @@ static __init int rfi_flush_debugfs_init(void)
return 0;
 }
 device_initcall(rfi_flush_debugfs_init);
+
+static int barrier_nospec_set(void *data, u64 val)
+{
+   switch (val) {
+   case 0:
+   case 1:
+   break;
+   default:
+   return -EINVAL;
+   }
+
+   if (!!val == !!barrier_nospec_enabled)
+   return 0;
+
+   barrier_nospec_enable(!!val);
+
+   return 0;
+}
+
+static int barrier_nospec_get(void *data, u64 *val)
+{
+   *val = barrier_nospec_enabled ? 1 : 0;
+   return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_barrier_nospec,
+   barrier_nospec_get, barrier_nospec_set, "%llu\n");
+
+static __init int barrier_nospec_debugfs_init(void)
+{
+   debugfs_create_file("barrier_nospec", 0600, powerpc_debugfs_root, NULL,
+   _barrier_nospec);
+   return 0;
+}
+device_initcall(barrier_nospec_debugfs_init);
 #endif
 
 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, 
char *buf)
-- 
2.13.6