linux-kernel - [PATCH 10/10] vmbus: expose debug info for drivers

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Date:   Mon, 27 Feb 2017 20:05:33 -0700
From:   kys@...hange.microsoft.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 10/10] vmbus: expose debug info for drivers

From: Stephen Hemminger <stephen@...workplumber.org>

Allow driver to get debug information about state of the ring.

Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/hyperv_vmbus.h |   11 -----------
 drivers/hv/ring_buffer.c  |    1 +
 include/linux/hyperv.h    |   17 +++++++++++++++++
 3 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index a69b52d..6113e91 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -248,14 +248,6 @@ struct hv_context {
 
 extern struct hv_context hv_context;
 
-struct hv_ring_buffer_debug_info {
-	u32 current_interrupt_mask;
-	u32 current_read_index;
-	u32 current_write_index;
-	u32 bytes_avail_toread;
-	u32 bytes_avail_towrite;
-};
-
 /* Hv Interface */
 
 extern int hv_init(void);
@@ -289,9 +281,6 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
 		       void *buffer, u32 buflen, u32 *buffer_actual_len,
 		       u64 *requestid, bool raw);
 
-void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
-				 struct hv_ring_buffer_debug_info *debug_info);
-
 /*
  * 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/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 8a24974..cfacca5 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -206,6 +206,7 @@ void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
 			ring_info->ring_buffer->interrupt_mask;
 	}
 }
+EXPORT_SYMBOL_GPL(hv_ringbuffer_get_debuginfo);
 
 /* Initialize the ring buffer. */
 int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 9d5df04..1f97f93 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -491,6 +491,12 @@ struct vmbus_channel_rescind_offer {
 	u32 child_relid;
 } __packed;
 
+static inline u32
+hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi)
+{
+	return rbi->ring_buffer->pending_send_sz;
+}
+
 /*
  * Request Offer -- no parameters, SynIC message contains the partition ID
  * Set Snoop -- no parameters, SynIC message contains the partition ID
@@ -1155,6 +1161,17 @@ static inline void hv_set_drvdata(struct hv_device *dev, void *data)
 	return dev_get_drvdata(&dev->device);
 }
 
+struct hv_ring_buffer_debug_info {
+	u32 current_interrupt_mask;
+	u32 current_read_index;
+	u32 current_write_index;
+	u32 bytes_avail_toread;
+	u32 bytes_avail_towrite;
+};
+
+void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
+			    struct hv_ring_buffer_debug_info *debug_info);
+
 /* Vmbus interface */
 #define vmbus_driver_register(driver)	\
 	__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
-- 
1.7.1