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Subject[PATCH v1 1/5] media: staging: tegra-vde: Align bitstream size to 16K
Date
I've noticed that decoding fails sometime if size of bitstream buffer
isn't aligned to 16K, probably because HW fetches data from memory in
a 16K granularity and if the last chunk of data isn't aligned, HW reads
garbage data beyond the dmabuf and tries to parse it.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/staging/media/tegra-vde/tegra-vde.c | 40 ++++++++++++-----------------
1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/media/tegra-vde/tegra-vde.c b/drivers/staging/media/tegra-vde/tegra-vde.c
index c47659e96089..c2ff2071b23c 100644
--- a/drivers/staging/media/tegra-vde/tegra-vde.c
+++ b/drivers/staging/media/tegra-vde/tegra-vde.c
@@ -440,7 +440,7 @@ static int tegra_vde_setup_hw_context(struct tegra_vde *vde,
VDE_WR(value, vde->sxe + 0x4C);

value = 0x03800000;
- value |= min_t(size_t, bitstream_data_size, SZ_1M);
+ value |= bitstream_data_size & GENMASK(19, 15);

VDE_WR(value, vde->sxe + 0x68);

@@ -522,7 +522,8 @@ static void tegra_vde_detach_and_put_dmabuf(struct dma_buf_attachment *a,
static int tegra_vde_attach_dmabuf(struct device *dev,
int fd,
unsigned long offset,
- unsigned int min_size,
+ size_t min_size,
+ size_t align_size,
struct dma_buf_attachment **a,
dma_addr_t *addr,
struct sg_table **s,
@@ -540,9 +541,16 @@ static int tegra_vde_attach_dmabuf(struct device *dev,
return PTR_ERR(dmabuf);
}

+ if (dmabuf->size & (align_size - 1)) {
+ dev_err(dev, "Unaligned dmabuf 0x%zX, "
+ "should be aligned to 0x%zX\n",
+ dmabuf->size, align_size);
+ return -EINVAL;
+ }
+
if ((u64)offset + min_size > dmabuf->size) {
dev_err(dev, "Too small dmabuf size %zu @0x%lX, "
- "should be at least %d\n",
+ "should be at least %zu\n",
dmabuf->size, offset, min_size);
return -EINVAL;
}
@@ -596,7 +604,7 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
int err;

err = tegra_vde_attach_dmabuf(dev, src->y_fd,
- src->y_offset, csize * 4,
+ src->y_offset, csize * 4, SZ_256,
&frame->y_dmabuf_attachment,
&frame->y_addr,
&frame->y_sgt,
@@ -605,7 +613,7 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
return err;

err = tegra_vde_attach_dmabuf(dev, src->cb_fd,
- src->cb_offset, csize,
+ src->cb_offset, csize, SZ_256,
&frame->cb_dmabuf_attachment,
&frame->cb_addr,
&frame->cb_sgt,
@@ -614,7 +622,7 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
goto err_release_y;

err = tegra_vde_attach_dmabuf(dev, src->cr_fd,
- src->cr_offset, csize,
+ src->cr_offset, csize, SZ_256,
&frame->cr_dmabuf_attachment,
&frame->cr_addr,
&frame->cr_sgt,
@@ -628,7 +636,7 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
}

err = tegra_vde_attach_dmabuf(dev, src->aux_fd,
- src->aux_offset, csize,
+ src->aux_offset, csize, SZ_256,
&frame->aux_dmabuf_attachment,
&frame->aux_addr,
&frame->aux_sgt,
@@ -677,21 +685,6 @@ static int tegra_vde_validate_frame(struct device *dev,
return -EINVAL;
}

- if (frame->y_offset & 0xFF) {
- dev_err(dev, "Bad y_offset 0x%X\n", frame->y_offset);
- return -EINVAL;
- }
-
- if (frame->cb_offset & 0xFF) {
- dev_err(dev, "Bad cb_offset 0x%X\n", frame->cb_offset);
- return -EINVAL;
- }
-
- if (frame->cr_offset & 0xFF) {
- dev_err(dev, "Bad cr_offset 0x%X\n", frame->cr_offset);
- return -EINVAL;
- }
-
return 0;
}

@@ -792,7 +785,8 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
return ret;

ret = tegra_vde_attach_dmabuf(dev, ctx.bitstream_data_fd,
- ctx.bitstream_data_offset, 0,
+ ctx.bitstream_data_offset,
+ SZ_16K, SZ_16K,
&bitstream_data_dmabuf_attachment,
&bitstream_data_addr,
&bitstream_sgt,
--
2.16.1
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