On Mon, 2021-02-01 at 14:54 +0000, Will Deacon wrote:

On Mon, Jan 11, 2021 at 07:18:41PM +0800, Yong Wu wrote:

quoted

This patch mainly adds support for mt8192 Multimedia IOMMU and SMI.

mt8192 also is MTK IOMMU gen2 which uses ARM Short-Descriptor translation
table format. The M4U-SMI HW diagram is as below:

                          EMI
                           |
                          M4U
                           |
                      ------------
                       SMI Common
                      ------------
                           |
  +-------+------+------+----------------------+-------+
  |       |      |      |       ......         |       |
  |       |      |      |                      |       |
larb0   larb1  larb2  larb4     ......      larb19   larb20
disp0   disp1   mdp    vdec                   IPE      IPE

All the connections are HW fixed, SW can NOT adjust it.

Comparing with the preview SoC, this patchset mainly adds two new functions:
a) add iova 34 bits support.
b) add multi domains support since several HW has the special iova
region requirement.

change note:
v6:a) base on v5.11-rc1. and tlb v4:
      https://lore.kernel.org/linux-mediatek/20210107122909.16317-1-yong.wu@mediatek.com/T/#t (local) 

I've queued this up apart from patches 6 and 7.

Thanks very much for the applying. I'd like to show there is a little
conflict with a smi change[1] in /include/soc/mediatek/smi.h.

This is the detailed conflict:

--- a/include/soc/mediatek/smi.h
+++ b/include/soc/mediatek/smi.h

@@ -9,7 +9,7 @@
 #include <linux/bitops.h>
 #include <linux/device.h>
 
-#ifdef CONFIG_MTK_SMI
+#if IS_ENABLED(CONFIG_MTK_SMI)   <---The smi patch change here.
 
 #define MTK_LARB_NR_MAX   16  <---This iommu patchset delete this line.

This code is simple. Please feel free to tell me how to do this if this
is not convenient to merge.

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl.git/commit/?h=for-next&id=50fc8d9232cdc64b9e9d1b9488452f153de52b69

Thanks,

Will

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