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From: Inki Dae <inki.dae@samsung.com>
To: Chanho Park <chanho61.park@samsung.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	"James E . J . Bottomley" <jejb@linux.ibm.com>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	cpgs@samsung.com
Cc: Bean Huo <beanhuo@micron.com>,
	Bart Van Assche <bvanassche@acm.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	Can Guo <cang@codeaurora.org>, Jaegeuk Kim <jaegeuk@kernel.org>,
	Gyunghoon Kwon <goodjob.kwon@samsung.com>,
	linux-samsung-soc@vger.kernel.org, linux-scsi@vger.kernel.org,
	Kiwoong Kim <kwmad.kim@samsung.com>
Subject: Re: [PATCH v3 15/17] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto
Date: Mon, 27 Sep 2021 14:31:43 +0900	[thread overview]
Message-ID: <1891546521.01632720301546.JavaMail.epsvc@epcpadp3> (raw)
In-Reply-To: <20210917065436.145629-16-chanho61.park@samsung.com>



21. 9. 17. 오후 3:54에 Chanho Park 이(가) 쓴 글:
> 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.
> 
> 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
> a ready message to VHs through a mailbox register. The message handler
> is not fully implemented yet such as supporting reset / abort cases.
> 
> Cc: Alim Akhtar <alim.akhtar@samsung.com>
> Cc: Kiwoong Kim <kwmad.kim@samsung.com>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> Signed-off-by: Chanho Park <chanho61.park@samsung.com>
> ---
>  drivers/scsi/ufs/ufs-exynos.c | 45 +++++++++++++++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufs-exynos.c b/drivers/scsi/ufs/ufs-exynos.c
> index 28f027d45917..0ca21cd8e76e 100644
> --- a/drivers/scsi/ufs/ufs-exynos.c
> +++ b/drivers/scsi/ufs/ufs-exynos.c
> @@ -83,6 +83,21 @@
>  #define UFS_SHARABLE		(UFS_WR_SHARABLE | UFS_RD_SHARABLE)
>  #define UFS_SHAREABILITY_OFFSET	0x710
>  
> +/* Multi-host registers */
> +#define MHCTRL					0xC4
> +#define MHCTRL_EN_VH_MASK			(0xE)
> +#define MHCTRL_EN_VH(vh)			(vh << 1)
> +#define PH2VH_MBOX				0xD8
> +
> +#define MH_MSG_MASK				(0xFF)
> +
> +#define MH_MSG(id, msg)				((id << 8) | (msg & 0xFF))
> +#define MH_MSG_PH_READY				0x1
> +#define MH_MSG_VH_READY				0x2
> +
> +#define HCI_MH_ALLOWABLE_TRAN_OF_VH		0x30C
> +#define HCI_MH_IID_IN_TASK_TAG			0X308
> +
>  enum {
>  	UNIPRO_L1_5 = 0,/* PHY Adapter */
>  	UNIPRO_L2,	/* Data Link */
> @@ -173,6 +188,20 @@ static int exynosauto_ufs_drv_init(struct device *dev, struct exynos_ufs *ufs)
>  	return 0;
>  }
>  
> +static int exynosauto_ufs_post_hce_enable(struct exynos_ufs *ufs)
> +{
> +	struct ufs_hba *hba = ufs->hba;
> +
> +	/* Enable Virtual Host #1 */
> +	ufshcd_rmwl(hba, MHCTRL_EN_VH_MASK, MHCTRL_EN_VH(1), MHCTRL);
> +	/* Default VH Transfer permissions */
> +	hci_writel(ufs, 0x03FFE1FE, HCI_MH_ALLOWABLE_TRAN_OF_VH);

How about using a defined macro instead of constant value, 0x03FFE1FE for code readability? And maybe 0x03FFE1FE to 0x3FFE1FE.

Thanks,
Inki Dae

> +	/* IID information is replaced in TASKTAG[7:5] instead of IID in UCD */
> +	hci_writel(ufs, 0x1, HCI_MH_IID_IN_TASK_TAG);
> +
> +	return 0;
> +}
> +
>  static int exynosauto_ufs_pre_link(struct exynos_ufs *ufs)
>  {
>  	struct ufs_hba *hba = ufs->hba;
> @@ -231,6 +260,20 @@ static int exynosauto_ufs_pre_pwr_change(struct exynos_ufs *ufs,
>  	return 0;
>  }
>  
> +static int exynosauto_ufs_post_pwr_change(struct exynos_ufs *ufs,
> +					  struct ufs_pa_layer_attr *pwr)
> +{
> +	struct ufs_hba *hba = ufs->hba;
> +	u32 enabled_vh;
> +
> +	enabled_vh = ufshcd_readl(hba, MHCTRL) & MHCTRL_EN_VH_MASK;
> +
> +	/* Send physical host ready message to virtual hosts */
> +	ufshcd_writel(hba, MH_MSG(enabled_vh, MH_MSG_PH_READY), PH2VH_MBOX);
> +
> +	return 0;
> +}
> +
>  static int exynos7_ufs_pre_link(struct exynos_ufs *ufs)
>  {
>  	struct ufs_hba *hba = ufs->hba;
> @@ -1395,8 +1438,10 @@ static struct exynos_ufs_drv_data exynosauto_ufs_drvs = {
>  				  EXYNOS_UFS_OPT_SKIP_CONFIG_PHY_ATTR |
>  				  EXYNOS_UFS_OPT_BROKEN_RX_SEL_IDX,
>  	.drv_init		= exynosauto_ufs_drv_init,
> +	.post_hce_enable	= exynosauto_ufs_post_hce_enable,
>  	.pre_link		= exynosauto_ufs_pre_link,
>  	.pre_pwr_change		= exynosauto_ufs_pre_pwr_change,
> +	.post_pwr_change	= exynosauto_ufs_post_pwr_change,
>  };
>  
>  static struct exynos_ufs_drv_data exynos_ufs_drvs = {
> 


  reply	other threads:[~2021-09-27  5:25 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210917065522epcas2p2c9c7baccfc82b3798804c351dbf676eb@epcas2p2.samsung.com>
2021-09-17  6:54 ` [PATCH v3 00/17] introduce exynosauto v9 ufs driver Chanho Park
     [not found]   ` <CGME20210917065522epcas2p49ce06e9686c9b6f5cb1dd16ca9d82052@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 01/17] scsi: ufs: add quirk to handle broken UIC command Chanho Park
2021-09-23  3:44       ` Alim Akhtar
     [not found]   ` <CGME20210917065522epcas2p4ed13768faa6aa6d33116606e2601321e@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 02/17] scsi: ufs: add quirk to enable host controller without ph configuration Chanho Park
2021-09-23  3:48       ` Alim Akhtar
     [not found]   ` <CGME20210917065522epcas2p26f56b37c3f7505b9d0e34bc2162fdbbd@epcas2p2.samsung.com>
2021-09-17  6:54     ` [PATCH v3 03/17] scsi: ufs: ufs-exynos: change pclk available max value Chanho Park
2021-09-27  5:25       ` Inki Dae
2021-09-27  6:46         ` Chanho Park
2021-09-27  7:11           ` Inki Dae
2021-09-27 11:08             ` Chanho Park
2021-09-28  2:18               ` Inki Dae
     [not found]   ` <CGME20210917065522epcas2p23066a1bd5e39ac1931d7e38064fe23dd@epcas2p2.samsung.com>
2021-09-17  6:54     ` [PATCH v3 04/17] scsi: ufs: ufs-exynos: simplify drv_data retrieval Chanho Park
     [not found]   ` <CGME20210917065523epcas2p3ff66daa15c8c782f839422756c388d93@epcas2p3.samsung.com>
2021-09-17  6:54     ` [PATCH v3 05/17] dt-bindings: ufs: exynos-ufs: add sysreg regmap property Chanho Park
2021-09-22 19:57       ` Rob Herring
2021-09-23  0:47         ` Chanho Park
2021-09-23 12:39           ` Rob Herring
2021-09-24  1:10             ` Chanho Park
     [not found]   ` <CGME20210917065523epcas2p477a63b06cbb9f5588aa2c149c9d1db10@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 06/17] scsi: ufs: ufs-exynos: get sysreg regmap for io-coherency Chanho Park
2021-09-22 19:55       ` Rob Herring
2021-09-23  0:39         ` Chanho Park
2021-09-23 12:26           ` Rob Herring
2021-09-24  0:59             ` Chanho Park
     [not found]   ` <CGME20210917065523epcas2p44a9f121c18e0f3a5614f980c9eeffa16@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 07/17] scsi: ufs: ufs-exynos: add refclkout_stop control Chanho Park
     [not found]   ` <CGME20210917065523epcas2p1215e9f56482339ca8a9346a0ac2bfe23@epcas2p1.samsung.com>
2021-09-17  6:54     ` [PATCH v3 08/17] scsi: ufs: ufs-exynos: add setup_clocks callback Chanho Park
2021-09-23  3:51       ` Alim Akhtar
     [not found]   ` <CGME20210917065523epcas2p15b648b88af85252fe12ff8026307526a@epcas2p1.samsung.com>
2021-09-17  6:54     ` [PATCH v3 09/17] scsi: ufs: ufs-exynos: correct timeout value setting registers Chanho Park
2021-09-23  4:14       ` Alim Akhtar
2021-09-23  5:47         ` Chanho Park
     [not found]   ` <CGME20210917065523epcas2p39e18203beafe9377e9dac819f01b804f@epcas2p3.samsung.com>
2021-09-17  6:54     ` [PATCH v3 10/17] scsi: ufs: ufs-exynos: support custom version of ufs_hba_variant_ops Chanho Park
2021-09-23  4:28       ` Alim Akhtar
     [not found]   ` <CGME20210917065523epcas2p3b178e3d9d2d4db628f597732be9c6856@epcas2p3.samsung.com>
2021-09-17  6:54     ` [PATCH v3 11/17] scsi: ufs: ufs-exynos: add EXYNOS_UFS_OPT_SKIP_CONFIG_PHY_ATTR option Chanho Park
2021-09-23  4:32       ` Alim Akhtar
     [not found]   ` <CGME20210917065523epcas2p2cb63cd8924be44e6eaa42c7213bd15d4@epcas2p2.samsung.com>
2021-09-17  6:54     ` [PATCH v3 12/17] scsi: ufs: ufs-exynos: factor out priv data init Chanho Park
     [not found]   ` <CGME20210917065523epcas2p4fc1be41c739361dd6ae9d167cfc631dc@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 13/17] scsi: ufs: ufs-exynos: add pre/post_hce_enable drv callbacks Chanho Park
2021-09-23  4:51       ` Alim Akhtar
     [not found]   ` <CGME20210917065523epcas2p47156d9fba5b8d8a5e5908ccdc0ae1655@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 14/17] scsi: ufs: ufs-exynos: support exynosauto v9 ufs driver Chanho Park
     [not found]   ` <CGME20210917065524epcas2p18a720757ef3c4fc08d4bc8d16f9fe7fe@epcas2p1.samsung.com>
2021-09-17  6:54     ` [PATCH v3 15/17] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto Chanho Park
2021-09-27  5:31       ` Inki Dae [this message]
2021-09-27  6:56         ` Chanho Park
     [not found]   ` <CGME20210917065524epcas2p3929f70cb0b62e6ca85a6f4814b61fae1@epcas2p3.samsung.com>
2021-09-17  6:54     ` [PATCH v3 16/17] scsi: ufs: ufs-exynos: introduce exynosauto v9 virtual host Chanho Park
     [not found]   ` <CGME20210917065524epcas2p455b2900227b6a20994bec4816248f2bf@epcas2p4.samsung.com>
2021-09-17  6:54     ` [PATCH v3 17/17] dt-bindings: ufs: exynos-ufs: add exynosautov9 compatible Chanho Park
2021-09-22 19:58       ` Rob Herring

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