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authorSebastian Ott <sebott@linux.vnet.ibm.com>2016-09-08 13:44:57 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-11-17 07:10:08 +0100
commit4f5359e94bbfbe349fd1ae00516dfe749d53fe22 (patch)
tree7e3ba089f8df67aa0219c41691939af49975c271 /Documentation/prctl
parent6b7df3ce92ac82ec3f4a2953b6fed77da7b38aaa (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>
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