On Mon, 18 Oct 2021 21:42:01 +0900, Chanho Park wrote: > In ExynosAuto(variant of the Exynos for automotive), the UFS Storage needs > to be accessed from multiple VMs. Traditional virtualization solution > provides para-virtualized block driver such as virtio-blk. However, they > can be highly depends on the Dom0 where the backend of the PV is > located. When the system gets high cpu pressure, the performance of > guest VMs are also affected. To overcome this, the SoC implements the > virtualization concept as the H/W controller level. > > Below figure is a conceptual design of the UFS Multi Host architecture. > > +------+ +------+ > | OS#1 | | OS#2 | > +------+ +------+ > | | > +------------+ +------------+ > | Physical | | Virtual | > | Host | | Host | > +------------+ +------------+ > | | | <-- UTP_CMD_SAP, UTP_TM_SAP > | +-------------------------+ > | | Function Arbiter | > | +-------------------------+ > +-------------------------------+ > | UTP Layer | > +-------------------------------+ > +-------------------------------+ > | UIC Layer | > +-------------------------------+ > > There are two types of host controllers of the UFS host controller > that we designed. The controller has a Function Arbiter that arranges > commands of each hosts. It will arrange the doorbells among the PH and > VHs as Round-Robin. When each host transmits a command to the Arbiter, > the Arbiter transmits it to the UTP layer. Physical Host(PH) support all > UFSHCI functions(all SAPs) same as conventional UFSHCI. > Virtual Hosts(VHs) support only data transfer function(UTP_CMD_SAP and > UTP_TM_SAP). > > In an environment where multiple VMs are used, the OS that has the > leadership of the system is called System OS(Dom0). This system OS will > own the PH and has a responsibility to handle UIC errors. > > VHs can only supports data transfer functions compared with the PH, > they're necessary to send a request to the PH for error handling of VHs. > To interface among the PH and VHs, the UFSHCI controller supports mailbox. > The mailbox register has 8 bit fields and they can be used as > arguments of the mailbox protocol. In this initial patchset, the PH > ready message is supported and they will be implemented to the next > steps. > > To support this virtual host type controller which only supports data > transfer function (TP_CMD_SAP and UTP_TM_SAP), we need to add below two > quirks. > - UFSHCD_QUIRK_BROKEN_UIC_CMD > - UFSHCD_QUIRK_SKIP_PH_CONFIGURATION > > First two patches, I picked them up from Jonmin's patchset[1] and the third > patch has been dropped because it's not necessary anymore. > > [1]: https://lore.kernel.org/linux-scsi/20210527030901.88403-1-jjmin.jeong@xxxxxxxxxxx/ > > Patch 0003 ~ 0010, they are changes of exynos7 ufs driver to apply > exynosauto v9 variant and PH/VH capabilities. > Patch 0011 ~ 0015, the patches introduce the exynosauto v9 ufs MHCI which > includes the PH and VHs. > > Changes from v4: > - s/Arbitor/Arbiter/g of cover-letter. > - Rephrase descriptions of cover letter from original patchset. > - Except 0007-scsi-ufs-ufs-exynos-correct-timeout-value-setting-re.patch > from this patchset and sent it independently > - Patch11/12: Consolidate sysreg and samsung,ufs-shareability-reg-offset > property. > - Patch14: > Drop wlun_dev_clr_ua configuration > Add TODO: tag for further implementations > > Changes from v3: > - Drop "[PATCH v3 06/17] scsi: ufs: ufs-exynos: get sysreg regmap for > io-coherency" and squash it to Patch12 > - Patch12: Use macro to avoid raw value usage and describe the value of M-Phy setting > - Patch13: Add dma-coherent property > - Patch14: Use macro to avoid raw value and describe the value of HCI_MH_ALLOWABLE_TRAN_OF_VH > > Changes from v2: > - Separate dt-binding patches on top of > https://lore.kernel.org/linux-devicetree/YUNdqnZ2kYefxFUC@xxxxxxxxxxxxxxxxxx/ > > Changes from v1: > - Change quirk name from UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION to > UFSHCD_QUIRK_SKIP_PH_CONFIGURATION > - Add compatibles to Documentation/devicetree/bindings/ufs/samsung,exynos-ufs.yaml > on top of https://lore.kernel.org/linux-scsi/20200613024706.27975-9-alim.akhtar@xxxxxxxxxxx/ > > Chanho Park (13): > scsi: ufs: ufs-exynos: change pclk available max value > scsi: ufs: ufs-exynos: simplify drv_data retrieval > scsi: ufs: ufs-exynos: add refclkout_stop control > scsi: ufs: ufs-exynos: add setup_clocks callback > scsi: ufs: ufs-exynos: support custom version of ufs_hba_variant_ops > scsi: ufs: ufs-exynos: add EXYNOS_UFS_OPT_SKIP_CONFIG_PHY_ATTR option > scsi: ufs: ufs-exynos: factor out priv data init > scsi: ufs: ufs-exynos: add pre/post_hce_enable drv callbacks > scsi: ufs: ufs-exynos: support exynosauto v9 ufs driver > dt-bindings: ufs: exynos-ufs: add io-coherency property > scsi: ufs: ufs-exynos: multi-host configuration for exynosauto > scsi: ufs: ufs-exynos: introduce exynosauto v9 virtual host > dt-bindings: ufs: exynos-ufs: add exynosautov9 compatible > > jongmin jeong (2): > scsi: ufs: add quirk to handle broken UIC command > scsi: ufs: add quirk to enable host controller without ph > configuration > > .../bindings/ufs/samsung,exynos-ufs.yaml | 10 + > drivers/scsi/ufs/ufs-exynos.c | 354 +++++++++++++++++- > drivers/scsi/ufs/ufs-exynos.h | 27 +- > drivers/scsi/ufs/ufshcd.c | 6 + > drivers/scsi/ufs/ufshcd.h | 12 + > 5 files changed, 386 insertions(+), 23 deletions(-) > > -- > 2.33.0 > > > > Applied patches 12 and 15, thanks!
