linux-kernel - Re: [PATCH v1 3/6] bus: mhi: Add MMIO region length to controller structure

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Message-ID: <928a29dca0d2b141d4e21b7878c1c42e@codeaurora.org>
Date:   Tue, 04 May 2021 16:04:12 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     Jeffrey Hugo <quic_jhugo@...cinc.com>
Cc:     manivannan.sadhasivam@...aro.org, linux-arm-msm@...r.kernel.org,
        hemantk@...eaurora.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org, linux-wireless@...r.kernel.org,
        kvalo@...eaurora.org, ath11k@...ts.infradead.org
Subject: Re: [PATCH v1 3/6] bus: mhi: Add MMIO region length to controller
 structure

Hi Jeff,

On 2021-05-04 10:28 AM, Jeffrey Hugo wrote:
> 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@...eaurora.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?
> 
OK. I missed out on this detail. I can move this size_t entry in v2.
>>   	void __iomem *bhi;
>>   	void __iomem *bhie;
>>   	void __iomem *wake_db;
>> 

Thanks,
Bhaumik
---
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