linux-kernel - Re: [PATCH 1/3] ufs: mcq: Add ufshcd_mcq_queue_cfg

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Date: Fri, 31 May 2024 13:15:11 -0700
From: Bart Van Assche <bvanassche@....org>
To: Minwoo Im <minwoo.im@...sung.com>,
 "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
 "Martin K . Petersen" <martin.petersen@...cle.com>
Cc: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
 gost.dev@...sung.com, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org, Jeuk Kim <jeuk20.kim@...sung.com>
Subject: Re: [PATCH 1/3] ufs: mcq: Add ufshcd_mcq_queue_cfg_addr helper

On 5/31/24 03:38, Minwoo Im wrote:
> This helper returns an offset address of MCQ queue configuration
> registers.  This is a prep patch for the following patch.
> 
> Signed-off-by: Minwoo Im <minwoo.im@...sung.com>
> ---
>   drivers/ufs/core/ufs-mcq.c | 14 ++++++++++++++
>   include/ufs/ufshcd.h       |  1 +
>   2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 52210c4c20dc..46faa54aea94 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -18,6 +18,7 @@
>   #include <linux/iopoll.h>
>   
>   #define MAX_QUEUE_SUP GENMASK(7, 0)
> +#define QCFGPTR GENMASK(23, 16)
>   #define UFS_MCQ_MIN_RW_QUEUES 2
>   #define UFS_MCQ_MIN_READ_QUEUES 0
>   #define UFS_MCQ_MIN_POLL_QUEUES 0
> @@ -116,6 +117,19 @@ struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
>   	return &hba->uhq[hwq];
>   }
>   
> +/**
> + * ufshcd_mcq_queue_cfg_addr - get an start address of the MCQ Queue Config
> + * Registers.
> + * @hba: per adapter instance
> + *
> + * Return: Start address of MCQ Queue Config Registers in HCI
> + */
> +unsigned int ufshcd_mcq_queue_cfg_addr(struct ufs_hba *hba)
> +{
> +	return FIELD_GET(QCFGPTR, hba->mcq_capabilities) * 0x200;
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_queue_cfg_addr);
> +
>   /**
>    * ufshcd_mcq_decide_queue_depth - decide the queue depth
>    * @hba: per adapter instance
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index df68fb1d4f3f..9e0581115b34 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -1278,6 +1278,7 @@ void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val);
>   void ufshcd_hba_stop(struct ufs_hba *hba);
>   void ufshcd_schedule_eh_work(struct ufs_hba *hba);
>   void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
> +unsigned int ufshcd_mcq_queue_cfg_addr(struct ufs_hba *hba);
>   u32 ufshcd_mcq_read_cqis(struct ufs_hba *hba, int i);
>   void ufshcd_mcq_write_cqis(struct ufs_hba *hba, u32 val, int i);
>   unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba,

New functions should not be introduced as a separate patch but instead should
be introduced in the first patch that adds a caller to the new function.

Thanks,

Bart.