linux-kernel - [PATCH v6 1/7] dmaengine: Remove dma_async_is

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Message-Id: <20221028204812.1772736-2-benjamin.walker@intel.com>
Date:   Fri, 28 Oct 2022 13:48:06 -0700
From:   Ben Walker <benjamin.walker@...el.com>
To:     vkoul@...nel.org
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dave Jiang <dave.jiang@...el.com>
Subject: [PATCH v6 1/7] dmaengine: Remove dma_async_is_complete from client API

This is never actually used by any existing DMA clients. It is only
used, via dma_cookie_status, by providers.

Signed-off-by: Ben Walker <benjamin.walker@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
---
 Documentation/driver-api/dmaengine/client.rst |  5 ++--
 drivers/dma/dmaengine.h                       | 10 ++++++-
 include/linux/dmaengine.h                     | 28 ++-----------------
 3 files changed, 14 insertions(+), 29 deletions(-)

diff --git a/Documentation/driver-api/dmaengine/client.rst b/Documentation/driver-api/dmaengine/client.rst
index bfd057b21a000..85ecec2c40005 100644
--- a/Documentation/driver-api/dmaengine/client.rst
+++ b/Documentation/driver-api/dmaengine/client.rst
@@ -346,9 +346,8 @@ Further APIs
    the documentation in include/linux/dmaengine.h for a more complete
    description of this API.
 
-   This can be used in conjunction with dma_async_is_complete() and
-   the cookie returned from dmaengine_submit() to check for
-   completion of a specific DMA transaction.
+   This can be used with the cookie returned from dmaengine_submit()
+   to check for completion of a specific DMA transaction.
 
    .. note::
 
diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h
index 53f16d3f00294..a2ce377e9ed0f 100644
--- a/drivers/dma/dmaengine.h
+++ b/drivers/dma/dmaengine.h
@@ -79,7 +79,15 @@ static inline enum dma_status dma_cookie_status(struct dma_chan *chan,
 		state->residue = 0;
 		state->in_flight_bytes = 0;
 	}
-	return dma_async_is_complete(cookie, complete, used);
+
+	if (complete <= used) {
+		if ((cookie <= complete) || (cookie > used))
+			return DMA_COMPLETE;
+	} else {
+		if ((cookie <= complete) && (cookie > used))
+			return DMA_COMPLETE;
+	}
+	return DMA_IN_PROGRESS;
 }
 
 static inline void dma_set_residue(struct dma_tx_state *state, u32 residue)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c923f4e60f240..c55dcae7dc620 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1426,9 +1426,9 @@ static inline void dma_async_issue_pending(struct dma_chan *chan)
  * @last: returns last completed cookie, can be NULL
  * @used: returns last issued cookie, can be NULL
  *
- * If @last and @used are passed in, upon return they reflect the driver
- * internal state and can be used with dma_async_is_complete() to check
- * the status of multiple cookies without re-checking hardware state.
+ * If @last and @used are passed in, upon return they reflect the most
+ * recently submitted (used) cookie and the most recently completed
+ * cookie.
  */
 static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
 	dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
@@ -1444,28 +1444,6 @@ static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
 	return status;
 }
 
-/**
- * dma_async_is_complete - test a cookie against chan state
- * @cookie: transaction identifier to test status of
- * @last_complete: last know completed transaction
- * @last_used: last cookie value handed out
- *
- * dma_async_is_complete() is used in dma_async_is_tx_complete()
- * the test logic is separated for lightweight testing of multiple cookies
- */
-static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
-			dma_cookie_t last_complete, dma_cookie_t last_used)
-{
-	if (last_complete <= last_used) {
-		if ((cookie <= last_complete) || (cookie > last_used))
-			return DMA_COMPLETE;
-	} else {
-		if ((cookie <= last_complete) && (cookie > last_used))
-			return DMA_COMPLETE;
-	}
-	return DMA_IN_PROGRESS;
-}
-
 static inline void
 dma_set_tx_state(struct dma_tx_state *st, dma_cookie_t last, dma_cookie_t used, u32 residue)
 {
-- 
2.37.3