Merge tag 'usb-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

[cascardo/linux.git] / drivers / hv / hyperv_vmbus.h

diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 12321b9..a5b4442 100644 (file)
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -35,6 +35,11 @@
  */
 #define HV_UTIL_TIMEOUT 30
 
+/*
+ * Timeout for guest-host handshake for services.
+ */
+#define HV_UTIL_NEGO_TIMEOUT 60
+
 /*
  * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
  * is set by CPUID(HVCPUID_VERSION_FEATURES).
@@ -490,7 +495,7 @@ struct hv_ring_buffer_debug_info {
 
 extern int hv_init(void);
 
-extern void hv_cleanup(void);
+extern void hv_cleanup(bool crash);
 
 extern int hv_post_message(union hv_connection_id connection_id,
                         enum hv_message_type message_type,
@@ -517,14 +522,15 @@ extern unsigned int host_info_edx;
 /* Interface */
 
 
-int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
-                  u32 buflen);
+int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
+                      struct page *pages, u32 pagecnt);
 
 void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
 
 int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
                    struct kvec *kv_list,
-                   u32 kv_count, bool *signal, bool lock);
+                   u32 kv_count, bool *signal, bool lock,
+                   enum hv_signal_policy policy);
 
 int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info,
                       void *buffer, u32 buflen, u32 *buffer_actual_len,
@@ -620,9 +626,21 @@ extern struct vmbus_channel_message_table_entry
        channel_message_table[CHANNELMSG_COUNT];
 
 /* Free the message slot and signal end-of-message if required */
-static inline void vmbus_signal_eom(struct hv_message *msg)
+static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 {
-       msg->header.message_type = HVMSG_NONE;
+       /*
+        * On crash we're reading some other CPU's message page and we need
+        * to be careful: this other CPU may already had cleared the header
+        * and the host may already had delivered some other message there.
+        * In case we blindly write msg->header.message_type we're going
+        * to lose it. We can still lose a message of the same type but
+        * we count on the fact that there can only be one
+        * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
+        * on crash.
+        */
+       if (cmpxchg(&msg->header.message_type, old_msg_type,
+                   HVMSG_NONE) != old_msg_type)
+               return;
 
        /*
         * Make sure the write to MessageType (ie set to
@@ -667,8 +685,6 @@ void vmbus_disconnect(void);
 
 int vmbus_post_msg(void *buffer, size_t buflen);
 
-void vmbus_set_event(struct vmbus_channel *channel);
-
 void vmbus_on_event(unsigned long data);
 void vmbus_on_msg_dpc(unsigned long data);