linux-kernel - Re: [PATCH 10/14] soc: hisilicon: kunpeng_hccs: Simplify PCC shared memory region handling

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Message-ID: <9eb0cd8b-00aa-e304-5b10-850c41b0c0c4@huawei.com>
Date: Thu, 6 Mar 2025 11:55:41 +0800
From: "lihuisong (C)" <lihuisong@...wei.com>
To: Sudeep Holla <sudeep.holla@....com>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Jassi Brar
	<jassisinghbrar@...il.com>, Adam Young <admiyo@...amperecomputing.com>
Subject: Re: [PATCH 10/14] soc: hisilicon: kunpeng_hccs: Simplify PCC shared
 memory region handling


在 2025/3/5 19:34, Sudeep Holla 写道:
> On Wed, Mar 05, 2025 at 03:14:50PM +0800, lihuisong (C) wrote:
>> 在 2025/3/3 18:51, Sudeep Holla 写道:
>>> The PCC driver now handles mapping and unmapping of shared memory
>>> areas as part of pcc_mbox_{request,free}_channel(). Without these before,
>>> this Kunpeng HCCS driver did handling of those mappings like several
>>> other PCC mailbox client drivers.
>>>
>>> There were redundant operations, leading to unnecessary code. Maintaining
>>> the consistency across these driver was harder due to scattered handling
>>> of shmem.
>>>
>>> Just use the mapped shmem and remove all redundant operations from this
>>> driver.
>>>
>>> Cc: Huisong Li <lihuisong@...wei.com>
>>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>> With belows to change,
>> Reviewed-by: Huisong Li <lihuisong@...wei.com>
> Thanks!
>
> [...]
>
>>> -	if (!pcc_chan->shmem_base_addr ||
>>> -	    pcc_chan->shmem_size != HCCS_PCC_SHARE_MEM_BYTES) {
>>> +	if (pcc_chan->shmem_size != HCCS_PCC_SHARE_MEM_BYTES) {
>>>    		dev_err(dev, "The base address or size (%llu) of PCC communication region is invalid.\n",
>>>    			pcc_chan->shmem_size);
>> Now the check of shared base address is not here. The log about this address
>> no need to be printed.
>>
>> Can you help me fix it like:
>>
>> dev_err(dev, "The base size (%llu) of PCC communication region must be %d Byte.\n",
>>   			pcc_chan->shmem_size, HCCS_PCC_SHARE_MEM_BYTES
>> );
> Sure.
>
> Did you get a chance to validate this driver and any other users of PCC
> on your platform with these changes + the error handling fix you pointed
> out ? That would be very useful as I don't have any set up to test.
Sure, I'll test this series.
>
> .