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From:   Christoph Hellwig <hch@lst.de>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Joonyoung Shim <jy0922.shim@samsung.com>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Tomasz Figa <tfiga@chromium.org>,
        Matt Porter <mporter@kernel.crashing.org>,
        iommu@lists.linux-foundation.org
Cc:     Stefan Richter <stefanr@s5r6.in-berlin.de>,
        linux1394-devel@lists.sourceforge.net, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        linux-parisc@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
        nouveau@lists.freedesktop.org, netdev@vger.kernel.org,
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        alsa-devel@alsa-project.org
Subject: [PATCH 10/18] hal2: convert to dma_alloc_noncoherent
Date:   Tue, 15 Sep 2020 17:51:14 +0200
Message-Id: <20200915155122.1768241-11-hch@lst.de>
In-Reply-To: <20200915155122.1768241-1-hch@lst.de>
References: <20200915155122.1768241-1-hch@lst.de>
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Sender: linux-kernel-owner@vger.kernel.org
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Use the new non-coherent DMA API including proper ownership transfers.
This also means we can allocate the buffer memory with the proper
direction instead of bidirectional.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 sound/mips/hal2.c | 58 ++++++++++++++++++++++-------------------------
 1 file changed, 27 insertions(+), 31 deletions(-)

diff --git a/sound/mips/hal2.c b/sound/mips/hal2.c
index ec84bc4c3a6e77..9ac9b58d7c8cdd 100644
--- a/sound/mips/hal2.c
+++ b/sound/mips/hal2.c
@@ -441,7 +441,8 @@ static inline void hal2_stop_adc(struct snd_hal2 *hal2)
 	hal2->adc.pbus.pbus->pbdma_ctrl = HPC3_PDMACTRL_LD;
 }
 
-static int hal2_alloc_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec)
+static int hal2_alloc_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec,
+		enum dma_data_direction buffer_dir)
 {
 	struct device *dev = hal2->card->dev;
 	struct hal2_desc *desc;
@@ -449,15 +450,15 @@ static int hal2_alloc_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec)
 	int count = H2_BUF_SIZE / H2_BLOCK_SIZE;
 	int i;
 
-	codec->buffer = dma_alloc_attrs(dev, H2_BUF_SIZE, &buffer_dma,
-					GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
+	codec->buffer = dma_alloc_noncoherent(dev, H2_BUF_SIZE, &buffer_dma,
+					buffer_dir, GFP_KERNEL);
 	if (!codec->buffer)
 		return -ENOMEM;
-	desc = dma_alloc_attrs(dev, count * sizeof(struct hal2_desc),
-			       &desc_dma, GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
+	desc = dma_alloc_noncoherent(dev, count * sizeof(struct hal2_desc),
+			&desc_dma, DMA_BIDIRECTIONAL, GFP_KERNEL);
 	if (!desc) {
-		dma_free_attrs(dev, H2_BUF_SIZE, codec->buffer, buffer_dma,
-			       DMA_ATTR_NON_CONSISTENT);
+		dma_free_noncoherent(dev, H2_BUF_SIZE, codec->buffer, buffer_dma,
+				buffer_dir);
 		return -ENOMEM;
 	}
 	codec->buffer_dma = buffer_dma;
@@ -470,20 +471,22 @@ static int hal2_alloc_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec)
 		      desc_dma : desc_dma + (i + 1) * sizeof(struct hal2_desc);
 		desc++;
 	}
-	dma_cache_sync(dev, codec->desc, count * sizeof(struct hal2_desc),
-		       DMA_TO_DEVICE);
+	dma_sync_single_for_device(dev, codec->desc_dma,
+				   count * sizeof(struct hal2_desc),
+				   DMA_BIDIRECTIONAL);
 	codec->desc_count = count;
 	return 0;
 }
 
-static void hal2_free_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec)
+static void hal2_free_dmabuf(struct snd_hal2 *hal2, struct hal2_codec *codec,
+		enum dma_data_direction buffer_dir)
 {
 	struct device *dev = hal2->card->dev;
 
-	dma_free_attrs(dev, codec->desc_count * sizeof(struct hal2_desc),
-		       codec->desc, codec->desc_dma, DMA_ATTR_NON_CONSISTENT);
-	dma_free_attrs(dev, H2_BUF_SIZE, codec->buffer, codec->buffer_dma,
-		       DMA_ATTR_NON_CONSISTENT);
+	dma_free_noncoherent(dev, codec->desc_count * sizeof(struct hal2_desc),
+		       codec->desc, codec->desc_dma, DMA_BIDIRECTIONAL);
+	dma_free_noncoherent(dev, H2_BUF_SIZE, codec->buffer, codec->buffer_dma,
+			buffer_dir);
 }
 
 static const struct snd_pcm_hardware hal2_pcm_hw = {
@@ -509,21 +512,16 @@ static int hal2_playback_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_hal2 *hal2 = snd_pcm_substream_chip(substream);
-	int err;
 
 	runtime->hw = hal2_pcm_hw;
-
-	err = hal2_alloc_dmabuf(hal2, &hal2->dac);
-	if (err)
-		return err;
-	return 0;
+	return hal2_alloc_dmabuf(hal2, &hal2->dac, DMA_TO_DEVICE);
 }
 
 static int hal2_playback_close(struct snd_pcm_substream *substream)
 {
 	struct snd_hal2 *hal2 = snd_pcm_substream_chip(substream);
 
-	hal2_free_dmabuf(hal2, &hal2->dac);
+	hal2_free_dmabuf(hal2, &hal2->dac, DMA_TO_DEVICE);
 	return 0;
 }
 
@@ -579,7 +577,9 @@ static void hal2_playback_transfer(struct snd_pcm_substream *substream,
 	unsigned char *buf = hal2->dac.buffer + rec->hw_data;
 
 	memcpy(buf, substream->runtime->dma_area + rec->sw_data, bytes);
-	dma_cache_sync(hal2->card->dev, buf, bytes, DMA_TO_DEVICE);
+	dma_sync_single_for_device(hal2->card->dev,
+			hal2->dac.buffer_dma + rec->hw_data, bytes,
+			DMA_TO_DEVICE);
 
 }
 
@@ -597,22 +597,16 @@ static int hal2_capture_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_hal2 *hal2 = snd_pcm_substream_chip(substream);
-	struct hal2_codec *adc = &hal2->adc;
-	int err;
 
 	runtime->hw = hal2_pcm_hw;
-
-	err = hal2_alloc_dmabuf(hal2, adc);
-	if (err)
-		return err;
-	return 0;
+	return hal2_alloc_dmabuf(hal2, &hal2->adc, DMA_FROM_DEVICE);
 }
 
 static int hal2_capture_close(struct snd_pcm_substream *substream)
 {
 	struct snd_hal2 *hal2 = snd_pcm_substream_chip(substream);
 
-	hal2_free_dmabuf(hal2, &hal2->adc);
+	hal2_free_dmabuf(hal2, &hal2->adc, DMA_FROM_DEVICE);
 	return 0;
 }
 
@@ -667,7 +661,9 @@ static void hal2_capture_transfer(struct snd_pcm_substream *substream,
 	struct snd_hal2 *hal2 = snd_pcm_substream_chip(substream);
 	unsigned char *buf = hal2->adc.buffer + rec->hw_data;
 
-	dma_cache_sync(hal2->card->dev, buf, bytes, DMA_FROM_DEVICE);
+	dma_sync_single_for_cpu(hal2->card->dev,
+			hal2->adc.buffer_dma + rec->hw_data, bytes,
+			DMA_FROM_DEVICE);
 	memcpy(substream->runtime->dma_area + rec->sw_data, buf, bytes);
 }
 
-- 
2.28.0