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| H A D | mtk_iommu.c | diff 37276e00da7d3a0d643d325aef81b7283fe23010 Fri Jul 03 06:41:23 CEST 2020 Chao Hao <chao.hao@mediatek.com> iommu/mediatek: Add sub_comm id in translation fault
The max larb number that a iommu HW support is 8(larb0~larb7 in the below
diagram).
If the larb's number is over 8, we use a sub_common for merging
several larbs into one larb. At this case, we will extend larb_id:
bit[11:9] means common-id;
bit[8:7] means subcommon-id;
>From these two variables, we could get the real larb number when
translation fault happen.
The diagram is as below:
EMI
|
IOMMU
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-----------------
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common1 common0
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-----------------
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smi common
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------------------------------------
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3'd0 3'd1 3'd2 3'd3 ... 3'd7 <-common_id(max is 8)
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Larb0 Larb1 | Larb3 ... Larb7
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smi sub common
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--------------------------
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2'd0 2'd1 2'd2 2'd3 <-sub_common_id(max is 4)
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Larb8 Larb9 Larb10 Larb11
In this patch we extend larb_remap[] to larb_remap[8][4] for this.
larb_remap[x][y]: x means common-id above, y means subcommon_id above.
We can also distinguish if the M4U HW has sub_common by HAS_SUB_COMM
macro.
Signed-off-by: Chao Hao <chao.hao@mediatek.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20200703044127.27438-7-chao.hao@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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