---

yaml --- r: 354975 b: refs/heads/master c: 6fdf3b2 h: refs/heads/master i: 354973: dc8867f 354971: 9c6ed27 354967: 7ba0716 354959: a3ed94f 354943: c6895eb v: v3
git-mirror · Jan 17, 2013 · 7095a53 · 7095a53
1 parent f3fb0bc
commit 7095a53
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Showing 3 changed files with 29 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0bffd25ce919f88ea6473150b66d26e7fa5712af
+refs/heads/master: 6fdf3b21433e901dcba0ac186f00d604ce944f56
diff --git a/trunk/drivers/hv/hyperv_vmbus.h b/trunk/drivers/hv/hyperv_vmbus.h
@@ -570,6 +570,10 @@ u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info);
 void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
 			    struct hv_ring_buffer_debug_info *debug_info);
 
+void hv_begin_read(struct hv_ring_buffer_info *rbi);
+
+u32 hv_end_read(struct hv_ring_buffer_info *rbi);
+
 /*
  * Maximum channels is determined by the size of the interrupt page
  * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt

diff --git a/trunk/drivers/hv/ring_buffer.c b/trunk/drivers/hv/ring_buffer.c
@@ -29,6 +29,30 @@
 
 #include "hyperv_vmbus.h"
 
+void hv_begin_read(struct hv_ring_buffer_info *rbi)
+{
+	rbi->ring_buffer->interrupt_mask = 1;
+	smp_mb();
+}
+
+u32 hv_end_read(struct hv_ring_buffer_info *rbi)
+{
+	u32 read;
+	u32 write;
+
+	rbi->ring_buffer->interrupt_mask = 0;
+	smp_mb();
+
+	/*
+	 * Now check to see if the ring buffer is still empty.
+	 * If it is not, we raced and we need to process new
+	 * incoming messages.
+	 */
+	hv_get_ringbuffer_availbytes(rbi, &read, &write);
+
+	return read;
+}
+
 
 /*
  * hv_get_next_write_location()