Hi Heinrich,
On Mon, 11 Oct 2021 at 04:07, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
On 10/1/21 13:48, Peter Robinson wrote:
On Fri, Oct 1, 2021 at 6:03 AM AKASHI Takahiro takahiro.akashi@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 | | `- mmc@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