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

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Date: Sat, 1 Jun 2024 05:55:23 +0900
From: Minwoo Im <minwoo.im@...sung.com>
To: Bart Van Assche <bvanassche@....org>
Cc: "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>, 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>, Minwoo Im
	<minwoo.im@...sung.com>
Subject: Re: [PATCH 1/3] ufs: mcq: Add ufshcd_mcq_queue_cfg_addr helper

On 24-05-31 13:15:11, Bart Van Assche wrote:
> 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.

I will squash it to the second one and udpate it in the next version.

> 
> Thanks,
> 
> Bart.
>