[PATCH] media: cedrus: Don't kernel map most buffers

From: Jernej Skrabec
Date: Sun Sep 12 2021 - 02:08:33 EST

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Except VP8 probability coefficients buffer, all other buffers are never
accessed by CPU. That allows us to mark them with DMA_ATTR_NO_KERNEL_MAPPING
flag. This helps with decoding big (like 4k) videos on 32-bit ARM
platforms where default vmalloc size is relatively small - 240 MiB.
Since auxiliary buffer are not yet efficiently allocated, this can be
easily exceeded. Even if allocation is optimized, 4k videos will still
often exceed this limit.

Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
---
.../staging/media/sunxi/cedrus/cedrus_h264.c | 102 ++++++++++--------
.../staging/media/sunxi/cedrus/cedrus_h265.c | 28 ++---
.../staging/media/sunxi/cedrus/cedrus_video.c | 2 +
3 files changed, 73 insertions(+), 59 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
index de7442d4834d..6e38b37d9fe1 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
@@ -538,23 +538,23 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)

ctx->codec.h264.pic_info_buf_size = pic_info_size;
ctx->codec.h264.pic_info_buf =
- dma_alloc_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
- &ctx->codec.h264.pic_info_buf_dma,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev, ctx->codec.h264.pic_info_buf_size,
+ &ctx->codec.h264.pic_info_buf_dma,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h264.pic_info_buf)
return -ENOMEM;

/*
* That buffer is supposed to be 16kiB in size, and be aligned
- * on 16kiB as well. However, dma_alloc_coherent provides the
+ * on 16kiB as well. However, dma_alloc_attrs provides the
* guarantee that we'll have a CPU and DMA address aligned on
* the smallest page order that is greater to the requested
* size, so we don't have to overallocate.
*/
ctx->codec.h264.neighbor_info_buf =
- dma_alloc_coherent(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
- &ctx->codec.h264.neighbor_info_buf_dma,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
+ &ctx->codec.h264.neighbor_info_buf_dma,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h264.neighbor_info_buf) {
ret = -ENOMEM;
goto err_pic_buf;
@@ -582,10 +582,11 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)

mv_col_size = field_size * 2 * CEDRUS_H264_FRAME_NUM;
ctx->codec.h264.mv_col_buf_size = mv_col_size;
- ctx->codec.h264.mv_col_buf = dma_alloc_coherent(dev->dev,
- ctx->codec.h264.mv_col_buf_size,
- &ctx->codec.h264.mv_col_buf_dma,
- GFP_KERNEL);
+ ctx->codec.h264.mv_col_buf =
+ dma_alloc_attrs(dev->dev,
+ ctx->codec.h264.mv_col_buf_size,
+ &ctx->codec.h264.mv_col_buf_dma,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h264.mv_col_buf) {
ret = -ENOMEM;
goto err_neighbor_buf;
@@ -600,10 +601,10 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)
ctx->codec.h264.deblk_buf_size =
ALIGN(ctx->src_fmt.width, 32) * 12;
ctx->codec.h264.deblk_buf =
- dma_alloc_coherent(dev->dev,
- ctx->codec.h264.deblk_buf_size,
- &ctx->codec.h264.deblk_buf_dma,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev,
+ ctx->codec.h264.deblk_buf_size,
+ &ctx->codec.h264.deblk_buf_dma,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h264.deblk_buf) {
ret = -ENOMEM;
goto err_mv_col_buf;
@@ -616,10 +617,10 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)
ctx->codec.h264.intra_pred_buf_size =
ALIGN(ctx->src_fmt.width, 64) * 5 * 2;
ctx->codec.h264.intra_pred_buf =
- dma_alloc_coherent(dev->dev,
- ctx->codec.h264.intra_pred_buf_size,
- &ctx->codec.h264.intra_pred_buf_dma,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev,
+ ctx->codec.h264.intra_pred_buf_size,
+ &ctx->codec.h264.intra_pred_buf_dma,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h264.intra_pred_buf) {
ret = -ENOMEM;
goto err_deblk_buf;
@@ -629,24 +630,28 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)
return 0;

err_deblk_buf:
- dma_free_coherent(dev->dev, ctx->codec.h264.deblk_buf_size,
- ctx->codec.h264.deblk_buf,
- ctx->codec.h264.deblk_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.deblk_buf_size,
+ ctx->codec.h264.deblk_buf,
+ ctx->codec.h264.deblk_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);

err_mv_col_buf:
- dma_free_coherent(dev->dev, ctx->codec.h264.mv_col_buf_size,
- ctx->codec.h264.mv_col_buf,
- ctx->codec.h264.mv_col_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.mv_col_buf_size,
+ ctx->codec.h264.mv_col_buf,
+ ctx->codec.h264.mv_col_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);

err_neighbor_buf:
- dma_free_coherent(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
- ctx->codec.h264.neighbor_info_buf,
- ctx->codec.h264.neighbor_info_buf_dma);
+ dma_free_attrs(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
+ ctx->codec.h264.neighbor_info_buf,
+ ctx->codec.h264.neighbor_info_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);

err_pic_buf:
- dma_free_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
- ctx->codec.h264.pic_info_buf,
- ctx->codec.h264.pic_info_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.pic_info_buf_size,
+ ctx->codec.h264.pic_info_buf,
+ ctx->codec.h264.pic_info_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
return ret;
}

@@ -654,23 +659,28 @@ static void cedrus_h264_stop(struct cedrus_ctx *ctx)
{
struct cedrus_dev *dev = ctx->dev;

- dma_free_coherent(dev->dev, ctx->codec.h264.mv_col_buf_size,
- ctx->codec.h264.mv_col_buf,
- ctx->codec.h264.mv_col_buf_dma);
- dma_free_coherent(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
- ctx->codec.h264.neighbor_info_buf,
- ctx->codec.h264.neighbor_info_buf_dma);
- dma_free_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
- ctx->codec.h264.pic_info_buf,
- ctx->codec.h264.pic_info_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.mv_col_buf_size,
+ ctx->codec.h264.mv_col_buf,
+ ctx->codec.h264.mv_col_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
+ dma_free_attrs(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
+ ctx->codec.h264.neighbor_info_buf,
+ ctx->codec.h264.neighbor_info_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
+ dma_free_attrs(dev->dev, ctx->codec.h264.pic_info_buf_size,
+ ctx->codec.h264.pic_info_buf,
+ ctx->codec.h264.pic_info_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
if (ctx->codec.h264.deblk_buf_size)
- dma_free_coherent(dev->dev, ctx->codec.h264.deblk_buf_size,
- ctx->codec.h264.deblk_buf,
- ctx->codec.h264.deblk_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.deblk_buf_size,
+ ctx->codec.h264.deblk_buf,
+ ctx->codec.h264.deblk_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
if (ctx->codec.h264.intra_pred_buf_size)
- dma_free_coherent(dev->dev, ctx->codec.h264.intra_pred_buf_size,
- ctx->codec.h264.intra_pred_buf,
- ctx->codec.h264.intra_pred_buf_dma);
+ dma_free_attrs(dev->dev, ctx->codec.h264.intra_pred_buf_size,
+ ctx->codec.h264.intra_pred_buf,
+ ctx->codec.h264.intra_pred_buf_dma,
+ DMA_ATTR_NO_KERNEL_MAPPING);
}

static void cedrus_h264_trigger(struct cedrus_ctx *ctx)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index 3d9561d4aadb..bb7eb56106c5 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -351,10 +351,10 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
ctx->codec.h265.mv_col_buf_unit_size;

ctx->codec.h265.mv_col_buf =
- dma_alloc_coherent(dev->dev,
- ctx->codec.h265.mv_col_buf_size,
- &ctx->codec.h265.mv_col_buf_addr,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev,
+ ctx->codec.h265.mv_col_buf_size,
+ &ctx->codec.h265.mv_col_buf_addr,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h265.mv_col_buf) {
ctx->codec.h265.mv_col_buf_size = 0;
// TODO: Abort the process here.
@@ -668,9 +668,9 @@ static int cedrus_h265_start(struct cedrus_ctx *ctx)
ctx->codec.h265.mv_col_buf_size = 0;

ctx->codec.h265.neighbor_info_buf =
- dma_alloc_coherent(dev->dev, CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE,
- &ctx->codec.h265.neighbor_info_buf_addr,
- GFP_KERNEL);
+ dma_alloc_attrs(dev->dev, CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE,
+ &ctx->codec.h265.neighbor_info_buf_addr,
+ GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
if (!ctx->codec.h265.neighbor_info_buf)
return -ENOMEM;

@@ -682,16 +682,18 @@ static void cedrus_h265_stop(struct cedrus_ctx *ctx)
struct cedrus_dev *dev = ctx->dev;

if (ctx->codec.h265.mv_col_buf_size > 0) {
- dma_free_coherent(dev->dev, ctx->codec.h265.mv_col_buf_size,
- ctx->codec.h265.mv_col_buf,
- ctx->codec.h265.mv_col_buf_addr);
+ dma_free_attrs(dev->dev, ctx->codec.h265.mv_col_buf_size,
+ ctx->codec.h265.mv_col_buf,
+ ctx->codec.h265.mv_col_buf_addr,
+ DMA_ATTR_NO_KERNEL_MAPPING);

ctx->codec.h265.mv_col_buf_size = 0;
}

- dma_free_coherent(dev->dev, CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE,
- ctx->codec.h265.neighbor_info_buf,
- ctx->codec.h265.neighbor_info_buf_addr);
+ dma_free_attrs(dev->dev, CEDRUS_H265_NEIGHBOR_INFO_BUF_SIZE,
+ ctx->codec.h265.neighbor_info_buf,
+ ctx->codec.h265.neighbor_info_buf_addr,
+ DMA_ATTR_NO_KERNEL_MAPPING);
}

static void cedrus_h265_trigger(struct cedrus_ctx *ctx)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index 66714609b577..800ffa5382de 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -568,6 +568,7 @@ int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,

src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+ src_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING;
src_vq->drv_priv = ctx;
src_vq->buf_struct_size = sizeof(struct cedrus_buffer);
src_vq->ops = &cedrus_qops;
@@ -584,6 +585,7 @@ int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,

dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+ src_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING;
dst_vq->drv_priv = ctx;
dst_vq->buf_struct_size = sizeof(struct cedrus_buffer);
dst_vq->ops = &cedrus_qops;
--
2.33.0

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