s390/tty3270: add support for diag 8c

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The current code uses diag210 to infer the 3270 geometry from the
model number when running on z/VM. This doesn't work well as almost
all 3270 software clients report as 3279-2 with a custom resolution.
tty3270 assumes it has a 80x24 terminal connected because of the -2
suffix. Use diag 8c to fetch the realy geometry from z/VM.

Note that this doesn't allow dynamic resizing, i.e. reconnecting to
a z/VM session with a different geometry.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Sven Schnelle 2022-11-17 22:02:01 +01:00 • committed by Heiko Carstens

parent 9603cb334a

commit fbaee7464f

4 changed files with 64 additions and 0 deletions

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14

arch/s390/include/asm/diag.h

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26

arch/s390/kernel/diag.c

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13

arch/s390/kernel/text_amode31.S

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11

drivers/s390/char/raw3270.c

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