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

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Message-ID: <1e7560ab-2545-843a-e42a-2d37f6b7ef93@huawei.com>
Date: Wed, 5 Mar 2025 15:14:50 +0800
From: "lihuisong (C)" <lihuisong@...wei.com>
To: Sudeep Holla <sudeep.holla@....com>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: 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 2025/3/3 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>
> ---
>   drivers/soc/hisilicon/kunpeng_hccs.c | 38 ++++++++++++------------------------
>   drivers/soc/hisilicon/kunpeng_hccs.h |  2 --
>   2 files changed, 13 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/soc/hisilicon/kunpeng_hccs.c b/drivers/soc/hisilicon/kunpeng_hccs.c
> index 8aa8dec14911cdcdc2a2d11606bf6159144e9489..3b57189cd778f507afaa89bf47f0fa834043c244 100644
> --- a/drivers/soc/hisilicon/kunpeng_hccs.c
> +++ b/drivers/soc/hisilicon/kunpeng_hccs.c
> @@ -167,10 +167,6 @@ static void hccs_pcc_rx_callback(struct mbox_client *cl, void *mssg)
>   
>   static void hccs_unregister_pcc_channel(struct hccs_dev *hdev)
>   {
> -	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
> -
> -	if (cl_info->pcc_comm_addr)
> -		iounmap(cl_info->pcc_comm_addr);
>   	pcc_mbox_free_channel(hdev->cl_info.pcc_chan);
>   }
>   
> @@ -179,6 +175,7 @@ static int hccs_register_pcc_channel(struct hccs_dev *hdev)
>   	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
>   	struct mbox_client *cl = &cl_info->client;
>   	struct pcc_mbox_chan *pcc_chan;
> +	struct mbox_chan *mbox_chan;
>   	struct device *dev = hdev->dev;
>   	int rc;
>   
> @@ -196,7 +193,7 @@ static int hccs_register_pcc_channel(struct hccs_dev *hdev)
>   		goto out;
>   	}
>   	cl_info->pcc_chan = pcc_chan;
> -	cl_info->mbox_chan = pcc_chan->mchan;
> +	mbox_chan = pcc_chan->mchan;
>   
>   	/*
>   	 * pcc_chan->latency is just a nominal value. In reality the remote
> @@ -206,34 +203,24 @@ static int hccs_register_pcc_channel(struct hccs_dev *hdev)
>   	cl_info->deadline_us =
>   			HCCS_PCC_CMD_WAIT_RETRIES_NUM * pcc_chan->latency;
>   	if (!hdev->verspec_data->has_txdone_irq &&
> -	    cl_info->mbox_chan->mbox->txdone_irq) {
> +	    mbox_chan->mbox->txdone_irq) {
>   		dev_err(dev, "PCC IRQ in PCCT is enabled.\n");
>   		rc = -EINVAL;
>   		goto err_mbx_channel_free;
>   	} else if (hdev->verspec_data->has_txdone_irq &&
> -		   !cl_info->mbox_chan->mbox->txdone_irq) {
> +		   !mbox_chan->mbox->txdone_irq) {
>   		dev_err(dev, "PCC IRQ in PCCT isn't supported.\n");
>   		rc = -EINVAL;
>   		goto err_mbx_channel_free;
>   	}
>   
> -	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
);

>   		rc = -EINVAL;
>   		goto err_mbx_channel_free;
>   	}
>