Hi Heinrich, On Mon, 11 Oct 2021 at 04:07, Heinrich Schuchardt <xypron.g...@gmx.de> wrote: > > > > On 10/1/21 13:48, Peter Robinson wrote: > > On Fri, Oct 1, 2021 at 6:03 AM AKASHI Takahiro > > <takahiro.aka...@linaro.org> wrote: > >> > >> In blk_get_device_by_str(), the comment says: "Updates the partition table > >> for the specified hw partition." > >> Since hw partition is supported only on MMC, it makes no sense to do so > >> for other devices. > > > > Is it not also supported on UFS, and I believe it may also be an > > option in the NVME spec too. > > An NVMe device may expose multiple namespaces. blk_create_devicef() is > called for each namespace. > > A SCSI device may have multiple LUNs. blk_create_devicef() is called for > each LUN. > > This is what the tree shown by 'dm tree' with on NVMe namespace and one LUN. > > Class Index Driver Name > --------------------------------------------------------------------- > root 0 root_driver root_driver > simple_bus 0 simple_bus |- soc > spi 1 sifive_spi | |- spi@10050000 > mmc 0 mmc_spi | | `- mmc@0 > blk 0 mmc_blk | | `- m...@0.blk > pci 0 pcie_sifive | |- pcie@e00000000 > pci 1 pci_bridge_drv | | `- pci_0:0.0 > pci 2 pci_bridge_drv | | `- pci_1:0.0 > pci 5 pci_bridge_drv | | |- pci_2:3.0 > ahci 0 ahci_pci | | | `- ahci_pci > scsi 0 ahci_scsi | | | `- ahci_scsi > blk 2 scsi_blk | | | `- ahci_scsi.id0lun0 > pci 6 pci_bridge_drv | | |- pci_2:4.0 > nvme 0 nvme | | | `- nvme#0 > blk 1 nvme-blk | | | `- nvme#0.blk#1 > > Namespaces and LUNs are modeled as block devices (class = 'blk').
So multiple block devices per NVMe device? I did not know that was supported. We need a sandbox driver for NVMe as it has no tests at present. Since it has no tests, I don't think we can expect people to know how to maintain whatever functionality is there. [..] Regards, Simon
