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

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Message-ID: <Z8lriBJQyk-8eOZ_@bogus>
Date: Thu, 6 Mar 2025 09:31:52 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: "lihuisong (C)" <lihuisong@...wei.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

On Thu, Mar 06, 2025 at 11:55:41AM +0800, lihuisong (C) wrote:
> 
> 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.
> >

I have posted v2 [1] with your feedback incorporated. Please use the same.

-- 
Regards,
Sudeep

[1] https://lore.kernel.org/r/20250305-pcc_fixes_updates-v2-0-1b1822bc8746@arm.com