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<div>Hi Angelo,</div>
<div><br>
</div>
<div>Thanks for the reviews.</div>
<div><br>
</div>
<div>On Wed, 2023-06-14 at 10:43 +0200, AngeloGioacchino Del Regno wrote:</div>
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<pre>Il 13/06/23 13:32, Jason-JH.Lin ha scritto:</pre>
<pre>> 1. Add casting before assign to avoid the unintentional integer</pre>
<pre>> overflow or unintended sign extension.</pre>
<pre>> 2. Add a int varriable for multiplier calculation instead of calculating</pre>
<pre>> different types multiplier with dma_addr_t varriable directly.</pre>
<pre>> </pre>
<pre>> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com></pre>
<pre>> Fixes: 1a64a7aff8da ("drm/mediatek: Fix cursor plane no update")</pre>
<pre>> ---</pre>
<pre>> drivers/gpu/drm/mediatek/mtk_drm_gem.c | 2 +-</pre>
<pre>> drivers/gpu/drm/mediatek/mtk_drm_plane.c | 22 +++++++++++++---------</pre>
<pre>> 2 files changed, 14 insertions(+), 10 deletions(-)</pre>
<pre>> </pre>
<pre>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c</pre>
<pre>> index a25b28d3ee90..0c7878bc0b37 100644</pre>
<pre>> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c</pre>
<pre>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c</pre>
<pre>> @@ -121,7 +121,7 @@ int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,</pre>
<pre>> int ret;</pre>
<pre>> </pre>
<pre>> args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);</pre>
<pre>> -args->size = args->pitch * args->height;</pre>
<pre>> +args->size = (__u64)args->pitch * args->height;</pre>
<pre><br></pre>
<pre>We could avoid explicit casting here if you do</pre>
<pre><br></pre>
<pre>args->size = args->pitch;</pre>
<pre>args->size *= args->height;</pre>
<pre><br></pre>
</blockquote>
<pre>OK, Thanks for your advice.</pre>
<pre>I'll take this.</pre>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<pre><br></pre>
<pre>> </pre>
<pre>> mtk_gem = mtk_drm_gem_create(dev, args->size, false);</pre>
<pre>> if (IS_ERR(mtk_gem))</pre>
<pre>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c</pre>
<pre>> index 31f9420aff6f..1cd41454d545 100644</pre>
<pre>> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c</pre>
<pre>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c</pre>
<pre>> @@ -145,6 +145,7 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,</pre>
<pre>> dma_addr_t addr;</pre>
<pre>> dma_addr_t hdr_addr = 0;</pre>
<pre>> unsigned int hdr_pitch = 0;</pre>
<pre>> +int offset;</pre>
<pre><br></pre>
<pre>...but offset can never be negative, can it?</pre>
<pre>in that case, this should be unsigned int.</pre>
<pre><br></pre>
</blockquote>
<pre>src.x1 and src.y1 are 'int', so they can be negative.</pre>
<pre>But I'm not sure does anyone would set the negative to them.</pre>
<pre><br></pre>
<pre>I think using 'unsigned int' for offset would be very big after multiply with negative src.x1 or src.y1.</pre>
<pre>So I just use 'int' here to avoid that case.</pre>
<pre><br></pre>
<pre>Do you think I should use 'unsigned int' for offset and add the boundary checking for addr?</pre>
<pre><br></pre>
<pre>Regard,</pre>
<pre>Jason-JH.Lin</pre>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<pre><br></pre>
<pre>> </pre>
<pre>> gem = fb->obj[0];</pre>
<pre>> mtk_gem = to_mtk_gem_obj(gem);</pre>
<pre>> @@ -154,8 +155,10 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,</pre>
<pre>> modifier = fb->modifier;</pre>
<pre>> </pre>
<pre>> if (modifier == DRM_FORMAT_MOD_LINEAR) {</pre>
<pre>> -addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];</pre>
<pre>> -addr += (new_state->src.y1 >> 16) * pitch;</pre>
<pre>> +offset = (new_state->src.x1 >> 16) * fb->format->cpp[0];</pre>
<pre>> +addr += offset;</pre>
<pre>> +offset = (new_state->src.y1 >> 16) * pitch;</pre>
<pre>> +addr += offset;</pre>
<pre>> } else {</pre>
<pre>> int width_in_blocks = ALIGN(fb->width, AFBC_DATA_BLOCK_WIDTH)</pre>
<pre>> / AFBC_DATA_BLOCK_WIDTH;</pre>
<pre>> @@ -163,21 +166,22 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,</pre>
<pre>> / AFBC_DATA_BLOCK_HEIGHT;</pre>
<pre>> int x_offset_in_blocks = (new_state->src.x1 >> 16) / AFBC_DATA_BLOCK_WIDTH;</pre>
<pre>> int y_offset_in_blocks = (new_state->src.y1 >> 16) / AFBC_DATA_BLOCK_HEIGHT;</pre>
<pre>> -int hdr_size;</pre>
<pre>> +int hdr_size, hdr_offset;</pre>
<pre>> </pre>
<pre>> hdr_pitch = width_in_blocks * AFBC_HEADER_BLOCK_SIZE;</pre>
<pre>> pitch = width_in_blocks * AFBC_DATA_BLOCK_WIDTH *</pre>
<pre>> AFBC_DATA_BLOCK_HEIGHT * fb->format->cpp[0];</pre>
<pre>> </pre>
<pre>> hdr_size = ALIGN(hdr_pitch * height_in_blocks, AFBC_HEADER_ALIGNMENT);</pre>
<pre>> +hdr_offset = hdr_pitch * y_offset_in_blocks +</pre>
<pre>> +AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks;</pre>
<pre>> +hdr_addr = addr + hdr_offset;</pre>
<pre>> </pre>
<pre>> -hdr_addr = addr + hdr_pitch * y_offset_in_blocks +</pre>
<pre>> - AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks;</pre>
<pre>> /* The data plane is offset by 1 additional block. */</pre>
<pre>> -addr = addr + hdr_size +</pre>
<pre>> - pitch * y_offset_in_blocks +</pre>
<pre>> - AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT *</pre>
<pre>> - fb->format->cpp[0] * (x_offset_in_blocks + 1);</pre>
<pre>> +offset = pitch * y_offset_in_blocks +</pre>
<pre>> + AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT *</pre>
<pre>> + fb->format->cpp[0] * (x_offset_in_blocks + 1);</pre>
<pre>> +addr = addr + hdr_size + offset;</pre>
<pre>> }</pre>
<pre>> </pre>
<pre>> mtk_plane_state->pending.enable = true;</pre>
<pre><br></pre>
<pre><br></pre>
<pre><br></pre>
</blockquote>
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