s390/uvdevice: Add info IOCTL

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Add an IOCTL that allows userspace to find out which IOCTLs the uvdevice
supports without trial and error.

Explicitly expose the IOCTL nr for the request types.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230615100533.3996107-3-seiden@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20230615100533.3996107-3-seiden@linux.ibm.com>

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This commit is contained in:

Steffen Eiden 2023-06-15 12:05:28 +02:00 • committed by Janosch Frank

parent 4255ce0177

commit ea9d971635

3 changed files with 112 additions and 9 deletions

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42

arch/s390/include/uapi/asm/uvdevice.h

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2

drivers/s390/char/Kconfig

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77

drivers/s390/char/uvdevice.c

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