powerpc/powernv: Fix endian issues with OPAL async code

OPAL defines opal_msg as a big endian struct so we have to
byte swap it on little endian builds.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

5 files changed, 16 insertions, 13 deletions

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 6fb5f90e6464..fc73661c20fa 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -422,9 +422,9 @@ enum OpalSysparamPerm {
 };
 
 struct opal_msg {
-        uint32_t msg_type;
-        uint32_t reserved;
-        uint64_t params[8];
+        __be32 msg_type;
+        __be32 reserved;
+        __be64 params[8];
 };
 
 struct opal_machine_check_event {
diff --git a/arch/powerpc/platforms/powernv/opal-async.c b/arch/powerpc/platforms/powernv/opal-async.c
index cd0c1354d404..32e2adfa5320 100644
--- a/arch/powerpc/platforms/powernv/opal-async.c
+++ b/arch/powerpc/platforms/powernv/opal-async.c
@@ -125,14 +125,15 @@ static int opal_async_comp_event(struct notifier_block *nb,
 {
         struct opal_msg *comp_msg = msg;
         unsigned long flags;
+        uint64_t token;
 
         if (msg_type != OPAL_MSG_ASYNC_COMP)
                 return 0;
 
-        memcpy(&opal_async_responses[comp_msg->params[0]], comp_msg,
-                        sizeof(*comp_msg));
+        token = be64_to_cpu(comp_msg->params[0]);
+        memcpy(&opal_async_responses[token], comp_msg, sizeof(*comp_msg));
         spin_lock_irqsave(&opal_async_comp_lock, flags);
-        __set_bit(comp_msg->params[0], opal_async_complete_map);
+        __set_bit(token, opal_async_complete_map);
         spin_unlock_irqrestore(&opal_async_comp_lock, flags);
 
         wake_up(&opal_async_wait);
diff --git a/arch/powerpc/platforms/powernv/opal-sensor.c b/arch/powerpc/platforms/powernv/opal-sensor.c
index 663cc9c65613..7503e298c4c3 100644
--- a/arch/powerpc/platforms/powernv/opal-sensor.c
+++ b/arch/powerpc/platforms/powernv/opal-sensor.c
@@ -53,7 +53,7 @@ int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
                 goto out_token;
         }
 
-        ret = msg.params[1];
+        ret = be64_to_cpu(msg.params[1]);
 
 out_token:
         mutex_unlock(&opal_sensor_mutex);
diff --git a/arch/powerpc/platforms/powernv/opal-sysparam.c b/arch/powerpc/platforms/powernv/opal-sysparam.c
index 0bd249a26f30..6b614726baf2 100644
--- a/arch/powerpc/platforms/powernv/opal-sysparam.c
+++ b/arch/powerpc/platforms/powernv/opal-sysparam.c
@@ -64,7 +64,7 @@ static int opal_get_sys_param(u32 param_id, u32 length, void *buffer)
                 goto out_token;
         }
 
-        ret = msg.params[1];
+        ret = be64_to_cpu(msg.params[1]);
 
 out_token:
         opal_async_release_token(token);
@@ -98,7 +98,7 @@ static int opal_set_sys_param(u32 param_id, u32 length, void *buffer)
                 goto out_token;
         }
 
-        ret = msg.params[1];
+        ret = be64_to_cpu(msg.params[1]);
 
 out_token:
         opal_async_release_token(token);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 7835d5bb973f..778a2793e75b 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -281,6 +281,7 @@ static void opal_handle_message(void)
          * value in /proc/device-tree.
          */
         static struct opal_msg msg;
+        u32 type;
 
         ret = opal_get_msg(__pa(&msg), sizeof(msg));
         /* No opal message pending. */
@@ -294,13 +295,14 @@ static void opal_handle_message(void)
                 return;
         }
 
+        type = be32_to_cpu(msg.msg_type);
+
         /* Sanity check */
-        if (msg.msg_type > OPAL_MSG_TYPE_MAX) {
-                pr_warning("%s: Unknown message type: %u\n",
-                                __func__, msg.msg_type);
+        if (type > OPAL_MSG_TYPE_MAX) {
+                pr_warning("%s: Unknown message type: %u\n", __func__, type);
                 return;
         }
-        opal_message_do_notify(msg.msg_type, (void *)&msg);
+        opal_message_do_notify(type, (void *)&msg);
 }
 
 static int opal_message_notify(struct notifier_block *nb,