Jaeyoon Choi
ae31f29285
This ioctl is for a port of ufs-utils: https://github.com/SanDisk-Open-Source/ufs-utils The driver only exposed a CAM SIM. Reading a descriptor, an attribute or a flag needs a query request, and a UniPro attribute needs a DME command. The driver built both only for its own setup, so userland could reach neither. Add two ioctls on the control node. UFSHCI_PASSTHROUGH_CMD sends a UPIU the caller built, sizes the request from its transaction code, and copies the response UPIU back. UFSHCI_PASSTHROUGH_UIC carries the four attribute commands and refuses the rest, which can drop the link or power the device off. It keeps the raw argument2 so the caller can read the result code the device reported, not just a failure. Validate the input and bound it by what the controller can map. The descriptor has no request length, so the controller reads it from the UPIU header, and a header that declares more than was copied in would reach past the descriptor. The ioctl layer copies output back only on a zero return. So a command that reached the device is a success even when it was refused. The caller reads the reason from the response header, and an answerless failure comes back as EIO. Clear the response before use so no stale bytes read as a device answer. Reviewed by: imp (mentor) Sponsored by: Samsung Electronics Differential Revision: https://reviews.freebsd.org/D59559
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