linux-kernel - Re: [PATCH v4] ACPI / tables: Add IORT to injectable table list

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Message-ID: <af8f2842-0999-d673-c908-bf3b4428fe67@huawei.com>
Date:   Tue, 6 Feb 2018 15:18:02 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Yang Shunyong <shunyong.yang@...-semitech.com>, <rjw@...ysocki.net>
CC:     <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Joey Zheng <yu.zheng@...-semitech.com>,
        "Wang Dongsheng" <dongsheng.wang@...-semitech.com>,
        Jiang Yutang <yutang2.jiang@...-semitech.com>
Subject: Re: [PATCH v4] ACPI / tables: Add IORT to injectable table list

On 2018/2/6 14:37, Yang Shunyong wrote:
> Loading IORT table from initrd can be used to fix severe firmware
> IORT defects temporarily before platform/BIOS vendor releases an
> upgraded BIOS binary.
> 
> Moreover, it is very powerful to debug SMMU node/device probe, MSI
> allocation, stream id translation and IORT table from firmware.
> 
> It is also very useful to enable SMMU and devices behind SMMU before
> firmware is ready.
> 
> This patch adds ACPI_SIG_IORT to the table, which enables IORT
> from initrd to override which from firmware.
> 
> Cc: Joey Zheng <yu.zheng@...-semitech.com>
> Cc: Wang Dongsheng <dongsheng.wang@...-semitech.com>
> Cc: Jiang Yutang <yutang2.jiang@...-semitech.com>
> Cc: Hanjun Guo <guohanjun@...wei.com>
> Signed-off-by: Yang Shunyong <shunyong.yang@...-semitech.com>

Acked-by: Hanjun Guo <hanjun.guo@...aro.org>

Thanks
Hanjun