[PATCH v3 20/30] staging: unisys: visorbus: fix visorchannel.c comments
David Kershner
david.kershner at unisys.com
Sat Jun 4 17:27:20 UTC 2016
From: David Binder <david.binder at unisys.com>
This patch ONLY touches comment lines, i.e., NO executable code is
affected.
Comments were fixed in visorchannel.c:
* All functions worthy of documenting now use standard kerneldoc
formatting.
* Multi-line comments were tweaked so as to use appropriate conventions.
* Minor typos were corrected.
* Useless comments were removed.
Signed-off-by: Tim Sell <Timothy.Sell at unisys.com>
Signed-off-by: David Kershner <david.kershner at unisys.com>
Signed-off-by: David Binder <david.binder at unisys.com>
---
drivers/staging/unisys/visorbus/visorchannel.c | 83 ++++++++++++++++++++++----
1 file changed, 71 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/unisys/visorbus/visorchannel.c b/drivers/staging/unisys/visorbus/visorchannel.c
index 1bfbc06..0ddfe05 100644
--- a/drivers/staging/unisys/visorbus/visorchannel.c
+++ b/drivers/staging/unisys/visorbus/visorchannel.c
@@ -15,7 +15,7 @@
*/
/*
- * This provides Supervisor channel communication primitives, which are
+ * This provides s-Par channel communication primitives, which are
* independent of the mechanism used to access the channel data.
*/
@@ -55,8 +55,28 @@ struct visorchannel {
uuid_le inst;
};
-/* Creates the struct visorchannel abstraction for a data area in memory,
- * but does NOT modify this data area.
+/**
+ * visorchannel_create_guts() - creates the struct visorchannel abstraction
+ * for a data area in memory, but does NOT modify
+ * this data area
+ * @physaddr: physical address of start of channel
+ * @channel_bytes: size of the channel in bytes; this may 0 if the channel has
+ * already been initialized in memory (which is true for all
+ * channels provided to guest environments by the s-Par
+ * back-end), in which case the actual channel size will be
+ * read from the channel header in memory
+ * @gfp: gfp_t to use when allocating memory for the data struct
+ * @guid: uuid that identifies channel type; this may 0 if the channel
+ * has already been initialized in memory (which is true for all
+ * channels provided to guest environments by the s-Par
+ * back-end), in which case the actual channel guid will be
+ * read from the channel header in memory
+ * @needs_lock: must specify true if you have multiple threads of execution
+ * that will be calling visorchannel methods of this
+ * visorchannel at the same time
+ *
+ * Return: pointer to visorchannel that was created if successful,
+ * otherwise NULL
*/
static struct visorchannel *
visorchannel_create_guts(u64 physaddr, unsigned long channel_bytes,
@@ -77,7 +97,8 @@ visorchannel_create_guts(u64 physaddr, unsigned long channel_bytes,
spin_lock_init(&channel->insert_lock);
spin_lock_init(&channel->remove_lock);
- /* Video driver constains the efi framebuffer so it will get a
+ /*
+ * Video driver constains the efi framebuffer so it will get a
* conflict resource when requesting its full mem region. Since
* we are only using the efi framebuffer for video we can ignore
* this. Remember that we haven't requested it so we don't try to
@@ -214,6 +235,12 @@ visorchannel_set_clientpartition(struct visorchannel *channel,
return 0;
}
+/**
+ * visorchannel_get_uuid() - queries the UUID of the designated channel
+ * @channel: the channel to query
+ *
+ * Return: the UUID of the provided channel
+ */
uuid_le
visorchannel_get_uuid(struct visorchannel *channel)
{
@@ -260,22 +287,25 @@ visorchannel_get_header(struct visorchannel *channel)
return (void __iomem *)&channel->chan_hdr;
}
-/** Return offset of a specific SIGNAL_QUEUE_HEADER from the beginning of a
- * channel header
+/*
+ * Return offset of a specific SIGNAL_QUEUE_HEADER from the beginning of a
+ * channel header
*/
#define SIG_QUEUE_OFFSET(chan_hdr, q) \
((chan_hdr)->ch_space_offset + \
((q) * sizeof(struct signal_queue_header)))
-/** Return offset of a specific queue entry (data) from the beginning of a
- * channel header
+/*
+ * Return offset of a specific queue entry (data) from the beginning of a
+ * channel header
*/
#define SIG_DATA_OFFSET(chan_hdr, q, sig_hdr, slot) \
(SIG_QUEUE_OFFSET(chan_hdr, q) + (sig_hdr)->sig_base_offset + \
((slot) * (sig_hdr)->signal_size))
-/** Write the contents of a specific field within a SIGNAL_QUEUE_HEADER back
- * into host memory
+/*
+ * Write the contents of a specific field within a SIGNAL_QUEUE_HEADER back
+ * into host memory
*/
#define SIG_WRITE_FIELD(channel, queue, sig_hdr, FIELD) \
(visorchannel_write(channel, \
@@ -350,7 +380,8 @@ signalremove_inner(struct visorchannel *channel, u32 queue, void *msg)
return false;
sig_hdr.num_received++;
- /* For each data field in SIGNAL_QUEUE_HEADER that was modified,
+ /*
+ * For each data field in SIGNAL_QUEUE_HEADER that was modified,
* update host memory.
*/
mb(); /* required for channel synch */
@@ -361,6 +392,15 @@ signalremove_inner(struct visorchannel *channel, u32 queue, void *msg)
return true;
}
+/**
+ * visorchannel_signalremove() - removes a message from the designated
+ * channel/queue
+ * @channel: the channel the message will be removed from
+ * @queue: the queue the message will be removed from
+ * @msg: the message to remove
+ *
+ * Return: boolean indicating whether the removal succeeded or failed
+ */
bool
visorchannel_signalremove(struct visorchannel *channel, u32 queue, void *msg)
{
@@ -379,6 +419,15 @@ visorchannel_signalremove(struct visorchannel *channel, u32 queue, void *msg)
}
EXPORT_SYMBOL_GPL(visorchannel_signalremove);
+/**
+ * visorchannel_signalempty() - checks if the designated channel/queue
+ * contains any messages
+ * @channel: the channel to query
+ * @queue: the queue in the channel to query
+ *
+ * Return: boolean indicating whether any messages in the designated
+ * channel/queue are present
+ */
bool
visorchannel_signalempty(struct visorchannel *channel, u32 queue)
{
@@ -425,7 +474,8 @@ signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
sig_hdr.num_sent++;
- /* For each data field in SIGNAL_QUEUE_HEADER that was modified,
+ /*
+ * For each data field in SIGNAL_QUEUE_HEADER that was modified,
* update host memory.
*/
mb(); /* required for channel synch */
@@ -437,6 +487,15 @@ signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
return true;
}
+/**
+ * visorchannel_signalinsert() - inserts a message into the designated
+ * channel/queue
+ * @channel: the channel the message will be added to
+ * @queue: the queue the message will be added to
+ * @msg: the message to insert
+ *
+ * Return: boolean indicating whether the insertion succeeded or failed
+ */
bool
visorchannel_signalinsert(struct visorchannel *channel, u32 queue, void *msg)
{
--
1.9.1
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