[PATCH 9/9] vmbus: expose debug info for drivers

From: kys
Date: Sat Mar 04 2017 - 20:30:03 EST


From: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>

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

Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
---
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 02f5d76..f681f7b 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