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Yong Wu b2a6876d21 iommu/mediatek: Get regionid from larb/port id 
After commit f1ad5338a4 ("of: Fix "dma-ranges" handling for bus
controllers"), the dma-ranges is not allowed for dts leaf node.
but we still would like to separate to different masters
into different iova regions.

Thus we have to separate it by the HW larbid and portid. For example,
larb1/2 are in region2 and larb3 is in region3. The problem is that
some ports inside a larb are in region4 while some ports inside this
larb are in region5. Therefore I define a "iova_region_larb_msk" to help
record the information for each a port. Take a example for a larb:
 [1] = ~0: means all ports in this larb are in region1;
 [2] = BIT(3) | BIT(4): means port3/4 in this larb are region2;
 [3] = ~(BIT(3) | BIT(4)): means all the other ports except port3/4
                           in this larb are region3.

This method also avoids the users forget/abuse the iova regions.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230411093144.2690-5-yong.wu@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
History 2023-04-13 11:59:24 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.