s390/cpcmd,vmcp: avoid GFP_DMA allocations

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According to the CP Programming Services manual Diagnose Code 8
"Virtual Console Function" can be used in all addressing modes. Also
the input and output buffers do not have a limitation which specifies
they need to be below the 2GB line.

This is true at least since z/VM 5.4.

Therefore remove the sam31/64 instructions and allow for simple
GFP_KERNEL allocations. This makes it easier to allocate a 1MB page
if the user requested such a large return buffer.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Heiko Carstens 2017-08-07 15:16:15 +02:00 • committed by Martin Schwidefsky

parent 267239cc10

commit cd4386a931

3 changed files with 8 additions and 14 deletions

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7

arch/s390/include/asm/cpcmd.h

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13

arch/s390/kernel/cpcmd.c

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2

drivers/s390/char/vmcp.c

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