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From: Chanho Park <chanho61.park@samsung.com>
To: 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>
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,
	Chanho Park <chanho61.park@samsung.com>,
	Kiwoong Kim <kwmad.kim@samsung.com>
Subject: [PATCH v3 15/17] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto
Date: Fri, 17 Sep 2021 15:54:34 +0900	[thread overview]
Message-ID: <20210917065436.145629-16-chanho61.park@samsung.com> (raw)
In-Reply-To: <20210917065436.145629-1-chanho61.park@samsung.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.

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);
+	/* 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 = {
-- 
2.33.0


  parent reply	other threads:[~2021-09-17  6:55 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     ` Chanho Park [this message]
2021-09-27  5:31       ` [PATCH v3 15/17] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto Inki Dae
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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