s390/pci: speed up __iowrite64_copy by using pci store block insn

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Benefit from pci store block instruction by writing up to 128 bytes
with a single instruction to MMIO space. Depending on the workload
this can result in a huge performance increase due to the reduced
number of instructions. The ordering guarantees of single stores
vs. one store block are identical.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Jan Glauber 2012-12-06 14:30:28 +01:00 • committed by Martin Schwidefsky

parent 9163003236

commit 87bc359b98

1 changed files with 6 additions and 0 deletions

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arch/s390/pci/pci.c

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