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').
Best regards
Heinrich
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org
disk/part.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/disk/part.c b/disk/part.c index a6a8f7052bd3..b330103a5bc0 100644 --- a/disk/part.c +++ b/disk/part.c @@ -427,7 +427,8 @@ int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str, * Always should be done, otherwise hw partition 0 will return stale * data after displaying a non-zero hw partition. */
part_init(*dev_desc);
if ((*dev_desc)->if_type == IF_TYPE_MMC)part_init(*dev_desc);#endif
cleanup:
-- 2.33.0