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Subject: Re: [PATCH v1 3/6] bus: mhi: Add MMIO region length to controller
 structure
To:     Bhaumik Bhatt <bbhatt@codeaurora.org>,
        <manivannan.sadhasivam@linaro.org>
CC:     <linux-arm-msm@vger.kernel.org>, <hemantk@codeaurora.org>,
        <linux-kernel@vger.kernel.org>, <loic.poulain@linaro.org>,
        <linux-wireless@vger.kernel.org>, <kvalo@codeaurora.org>,
        <ath11k@lists.infradead.org>
References: <1618598825-18629-1-git-send-email-bbhatt@codeaurora.org>
 <1618598825-18629-4-git-send-email-bbhatt@codeaurora.org>
From:   Jeffrey Hugo <quic_jhugo@quicinc.com>
Message-ID: <83589a09-e1a0-4611-a844-0ea52ca036b9@quicinc.com>
Date:   Tue, 4 May 2021 11:28:26 -0600
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On 4/16/2021 12:47 PM, Bhaumik Bhatt wrote:
> Make controller driver specify the MMIO register region length
> for range checking of BHI or BHIe space. This can help validate
> that offsets are in acceptable memory region or not and avoid any
> boot-up issues due to BHI or BHIe memory accesses.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
> ---
>   include/linux/mhi.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index 944aa3a..ad53b24 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -293,6 +293,7 @@ struct mhi_controller_config {
>    * @mhi_dev: MHI device instance for the controller
>    * @debugfs_dentry: MHI controller debugfs directory
>    * @regs: Base address of MHI MMIO register space (required)
> + * @reg_len: Length of the MHI MMIO region (required)
>    * @bhi: Points to base of MHI BHI register space
>    * @bhie: Points to base of MHI BHIe register space
>    * @wake_db: MHI WAKE doorbell register address
> @@ -375,6 +376,7 @@ struct mhi_controller {
>   	struct mhi_device *mhi_dev;
>   	struct dentry *debugfs_dentry;
>   	void __iomem *regs;
> +	size_t reg_len;

Didn't Mani make sure this struct was packed using pahole when things 
were first upstreamed?  Feels like sticking this in the middle of a 
bunch of void * entries will add some padding.  Am I wrong?

>   	void __iomem *bhi;
>   	void __iomem *bhie;
>   	void __iomem *wake_db;
>