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author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-09-08 13:44:57 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-11-17 07:10:08 +0100 |
commit | 4f5359e94bbfbe349fd1ae00516dfe749d53fe22 (patch) | |
tree | 7e3ba089f8df67aa0219c41691939af49975c271 /Documentation/prctl | |
parent | 6b7df3ce92ac82ec3f4a2953b6fed77da7b38aaa (diff) |
s390/pci_dma: make lazy flush independent from the tlb_refresh bit
We have 2 strategies to reduce the number of RPCIT instructions:
* A HW feature indicated via the tlb_refresh bit allows us to omit RPCIT for
invalid -> valid translation-table entry updates.
* With "lazy flush" we omit RPCIT for valid -> invalid updates until we run
out of dma addresses. When we have to reuse dma addresses we issue a global
tlb flush using only one RPCIT instruction.
Currently lazy flushing depends on tlb_refresh. Since there is no technical
reason for this remove this dependency.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'Documentation/prctl')
0 files changed, 0 insertions, 0 deletions