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From: "Chanho Park" <chanho61.park@samsung.com>
To: "'Bean Huo'" <huobean@gmail.com>,
	"'Krzysztof Kozlowski'" <krzk@kernel.org>,
	"'Alim Akhtar'" <alim.akhtar@samsung.com>,
	"'James E . J . Bottomley'" <jejb@linux.ibm.com>,
	"'Martin K . Petersen'" <martin.petersen@oracle.com>
Cc: "'Can Guo'" <cang@codeaurora.org>,
	"'Jaegeuk Kim'" <jaegeuk@kernel.org>,
	"'Kiwoong Kim'" <kwmad.kim@samsung.com>,
	"'Avri Altman'" <avri.altman@wdc.com>,
	"'Adrian Hunter'" <adrian.hunter@intel.com>,
	"'Christoph Hellwig'" <hch@infradead.org>,
	"'Bart Van Assche'" <bvanassche@acm.org>,
	"'jongmin jeong'" <jjmin.jeong@samsung.com>,
	"'Gyunghoon Kwon'" <goodjob.kwon@samsung.com>,
	<linux-samsung-soc@vger.kernel.org>, <linux-scsi@vger.kernel.org>
Subject: RE: [PATCH v2 14/15] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto
Date: Mon, 26 Jul 2021 19:40:08 +0900	[thread overview]
Message-ID: <000601d7820a$9aa11210$cfe33630$@samsung.com> (raw)
In-Reply-To: <2b4f4e6d76cdc517843fe8880312541c754d5352.camel@gmail.com>

> > UFS controller of ExynosAuto v9 SoC supports multi-host interface for
> > I/O
> >
> > virtualization. In general, we're using para-virtualized driver to
> >
> > support a block device by several virtual machines. However, it should
> >
> > be relayed by backend driver. Multi-host functionality extends the
> > host
> >
> > controller by providing register interfaces that can be used by each
> >
> > VM's ufs drivers respectively. By this, we can provide direct access
> > to
> >
> > the UFS device for multiple VMs. It's similar with SR-IOV of PCIe.
> >
> 
> Hi Chanho Park,
> very inteseted in this patch. you mentined SR-IOV. In order to make your
> patch work on the UFS, does UFS device side need changes?
> 
> or the common current 3.1 UFS can work with this new controller?

Our UFS controller was built on top of JEDEC 2.1 spec with some custom implementations to support this feature. UFS device side, no changes will be necessary.

> 
> 
> 
> >
> >
> > We divide this M-HCI as PH(Physical Host) and VHs(Virtual Host). The
> > PH
> >
> > supports all UFSHCI functions(all SAPs) same as conventional UFSHCI
> > but
> >
> > the VH only supports data transfer function. Thus, except UTP_CMD_SAP
> > and
> >
> > UTP_TMPSAP, the PH should handle all the physical features.
> >
> >
> >
> > This patch provides an initial implementation of PH part. M-HCI can
> >
> > support up to four interfaces but this patch initially supports only
> > 1
> >
> > PH and 1 VH. For this, we uses TASK_TAG[7:5] field so TASK_TAG[4:0]
> > for
> >
> > 32 doorbel will be supported. After the PH is initiated, this will
> > send
> 
> 
> I don't understand here.  how many doorbell registers you have now?
> and doesn VHs have a doorbell register also? and each doorbell register
> still supprts 32 tags?

A PH has its own doorbell register and each VHs also has it as well.
The TASK_TAG[7:5] can be used to distinguish the origin of the request among VHs and remaining TASK_TAG[4:0] will be used for supporting 32 tags.

Best Regards,
Chanho Park


  reply	other threads:[~2021-07-26 10:40 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210714071158epcas2p1a7b98fd67b9bcaaa634e59fc224761b1@epcas2p1.samsung.com>
2021-07-14  7:11 ` [PATCH v2 00/15] introduce exynosauto v9 ufs driver Chanho Park
     [not found]   ` <CGME20210714071158epcas2p261e6c9157056fafca0f55aaf05cd68ef@epcas2p2.samsung.com>
2021-07-14  7:11     ` [PATCH v2 01/15] scsi: ufs: add quirk to handle broken UIC command Chanho Park
     [not found]   ` <CGME20210714071158epcas2p29900b577a489b760a1e67eba976fb815@epcas2p2.samsung.com>
2021-07-14  7:11     ` [PATCH v2 02/15] scsi: ufs: add quirk to enable host controller without ph configuration Chanho Park
     [not found]   ` <CGME20210714071159epcas2p36dc12e150a84ef4fa2516bc98169725b@epcas2p3.samsung.com>
2021-07-14  7:11     ` [PATCH v2 03/15] scsi: ufs: ufs-exynos: change pclk available max value Chanho Park
     [not found]   ` <CGME20210714071159epcas2p3fa23ac2a670e1c31deeac1c9332f76fe@epcas2p3.samsung.com>
2021-07-14  7:11     ` [PATCH v2 04/15] scsi: ufs: ufs-exynos: simplify drv_data retrieval Chanho Park
     [not found]   ` <CGME20210714071159epcas2p2ae981fb3b91b0eba23060de5de104ec0@epcas2p2.samsung.com>
2021-07-14  7:11     ` [PATCH v2 05/15] scsi: ufs: ufs-exynos: get sysreg regmap for io-coherency Chanho Park
     [not found]   ` <CGME20210714071159epcas2p3d39f7e5cbd9a2b8addaa496a396213af@epcas2p3.samsung.com>
2021-07-14  7:11     ` [PATCH v2 06/15] scsi: ufs: ufs-exynos: add refclkout_stop control Chanho Park
     [not found]   ` <CGME20210714071159epcas2p4c4eabf50abdaa46567fc5356bce8942b@epcas2p4.samsung.com>
2021-07-14  7:11     ` [PATCH v2 07/15] scsi: ufs: ufs-exynos: add setup_clocks callback Chanho Park
     [not found]   ` <CGME20210714071159epcas2p24b7be0cad31af09bc71c608f9b03fe36@epcas2p2.samsung.com>
2021-07-14  7:11     ` [PATCH v2 08/15] scsi: ufs: ufs-exynos: correct timeout value setting registers Chanho Park
     [not found]   ` <CGME20210714071159epcas2p4edc8104aad36d4d7a5bedb8328c0ab39@epcas2p4.samsung.com>
2021-07-14  7:11     ` [PATCH v2 09/15] scsi: ufs: ufs-exynos: support custom version of ufs_hba_variant_ops Chanho Park
     [not found]   ` <CGME20210714071159epcas2p24323976939fa21a5ed44d81649b33d85@epcas2p2.samsung.com>
2021-07-14  7:11     ` [PATCH v2 10/15] scsi: ufs: ufs-exynos: add EXYNOS_UFS_OPT_SKIP_CONFIG_PHY_ATTR option Chanho Park
     [not found]   ` <CGME20210714071159epcas2p176be9a1310f8de27cfb3786fe86630d6@epcas2p1.samsung.com>
2021-07-14  7:11     ` [PATCH v2 11/15] scsi: ufs: ufs-exynos: factor out priv data init Chanho Park
     [not found]   ` <CGME20210714071159epcas2p428292c7d0e97533de65d92a029eece93@epcas2p4.samsung.com>
2021-07-14  7:11     ` [PATCH v2 12/15] scsi: ufs: ufs-exynos: add pre/post_hce_enable drv callbacks Chanho Park
     [not found]   ` <CGME20210714071200epcas2p199f4f7b209e565c9a87440af319acda1@epcas2p1.samsung.com>
2021-07-14  7:11     ` [PATCH v2 13/15] scsi: ufs: ufs-exynos: support exynosauto v9 ufs driver Chanho Park
     [not found]   ` <CGME20210714071200epcas2p3f76e68f6bbb4755574dba2055a8130ab@epcas2p3.samsung.com>
2021-07-14  7:11     ` [PATCH v2 14/15] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto Chanho Park
2021-07-26  9:08       ` Bean Huo
2021-07-26 10:40         ` Chanho Park [this message]
2021-07-26 21:58           ` Bean Huo
2021-07-27 10:14             ` Chanho Park
2021-07-27 19:36               ` Bean Huo
2021-07-28  1:39                 ` Chanho Park
2021-07-29 21:10                   ` Bean Huo
2021-07-26 22:06       ` Bean Huo
2021-07-27  9:05         ` Chanho Park
     [not found]   ` <CGME20210714071200epcas2p413ca643dc459ee75ec7e5e4f8a6c05d7@epcas2p4.samsung.com>
2021-07-14  7:11     ` [PATCH v2 15/15] scsi: ufs: ufs-exynos: introduce exynosauto v9 virtual host Chanho Park

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