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(parent: 9163003) | patch
s390/pci: speed up __iowrite64_copy by using pci store block insn
authorJan Glauber <jang@linux.vnet.ibm.com>
Thu, 6 Dec 2012 13:30:28 +0000 (14:30 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Tue, 11 Dec 2012 13:52:42 +0000 (14:52 +0100)
commit87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72
tree643e20ebffcf7eda13ad33c1bbeba82b306738c4tree | snapshot
parent9163003236a52fd1a8ee6ca8a04f7232d001fc98commit | diff
s390/pci: speed up __iowrite64_copy by using pci store block insn

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>
arch/s390/pci/pci.c diff | blob | history
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