Jon Hunter a5f5774c55 mmc: block: Add new ioctl to send multi commands ...

Certain eMMC devices allow vendor specific device information to be read
via a sequence of vendor commands. These vendor commands must be issued
in sequence and an atomic fashion. One way to support this would be to
add an ioctl function for sending a sequence of commands to the device
atomically as proposed here. These multi commands are simple array of
the existing mmc_ioc_cmd structure.

The structure passed via the ioctl uses a __u64 type to specify the number
of commands (so that the structure is aligned on a 64-bit boundary) and a
zero length array as a header for list of commands to be issued. The
maximum number of commands that can be sent is determined by
MMC_IOC_MAX_CMDS (which defaults to 255 and should be more than
sufficient).

This based upon work by Seshagiri Holi <[email protected]>.

Signed-off-by: Seshagiri Holi <[email protected]>
Signed-off-by: Jon Hunter <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>

2015-10-26 16:00:00 +01:00

..

ioctl.h

mmc: block: Add new ioctl to send multi commands

2015-10-26 16:00:00 +01:00

Kbuild

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