On 18/09/26 22:06:32, Jorge Ramirez-Ortiz wrote: > OP-TEE secure storage (CFG_RPMB_FS) relies on an RPMB partition, but > U-Boot's OP-TEE RPMB supplicant only speaks the legacy single-command > interface, which is bound to eMMC. SoCs that are UFS-only and have no > eMMC (for example the Qualcomm SA8775P) therefore cannot back OP-TEE > secure storage from U-Boot today. This series adds that support. > > It introduces the transport-agnostic OP-TEE RPMB "subsystem" interface > (PROBE_RESET / PROBE_NEXT / FRAMES), where the normal world enumerates > the RPMB device and reports its kind, size and CID, then carries the > signed frames. The legacy eMMC supplicant is preserved unchanged, only > renamed to rpmb_emmc.c, with the new UFS backend added as a separate > rpmb_ufs.c; the two are mutually exclusive via Kconfig (SUPPORT_UFS_RPMB > depends on !SUPPORT_EMMC_RPMB) because the OP-TEE supplicant handles a > single RPMB transport. The subsystem interface is UFS-only for now; eMMC > can be migrated onto it later as the legacy path is retired. > > On top of that it adds a UFS RPMB transport that moves JEDEC RPMB frames > to and from the RPMB Well-Known LUN using SCSI SECURITY PROTOCOL IN/OUT. > The per-region 16-byte CID is derived by BLAKE2b-hashing the exact > device-id string the Linux kernel builds (ufshcd_create_device_id() > plus a "-R<region>" suffix), so OP-TEE derives an RPMB key that matches > the one Linux would use. > > The first patch is a standalone UFS descriptor fix the RPMB path depends > on (UTF-16BE string decoding). A small preparatory patch surfaces the > RESPONSE UPIU sense data from ufs_scsi_exec() so the transport can retry > only on a power-on UNIT ATTENTION; the transport patch also bounces > unaligned frames through a DMA-aligned buffer for the RPMB WLUN. > > Note: reading UFS descriptors reliably also requires the descriptor > data-segment cache-invalidation fix, which has already been posted and > merged separately, so this series is based on top of it. > > Tested on the Qualcomm IQ-9075-EVK (SA8775P): OP-TEE with CFG_RPMB_FS > programs the RPMB key through U-Boot and reads/writes secure-storage > objects, with the derived CID matching the Linux UFS device_id ABI. > > Dependencies: > Linux kernel: > > https://lore.kernel.org/linux-scsi/[email protected]/ accepted in v4 --> https://lkml.org/lkml/2026/8/27/369
> Op-tee > https://github.com/OP-TEE/optee_os/pull/7881 and also following Ilias review https://github.com/OP-TEE/optee_os/pull/8007 (both merged) For reference, at this point Linux can access RPMB and just u-boot pending on this set.
