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| H A D | hw_breakpoint.c | diff 3d2ffcdd2a982e8bbe65fa0f94fb21bf304c281e Thu Nov 05 22:56:50 CST 2020 Ravi Bangoria <ravi.bangoria@linux.ibm.com> powerpc/watchpoint: Workaround P10 DD1 issue with VSX-32 byte instructions
POWER10 DD1 has an issue where it generates watchpoint exceptions when
it shouldn't. The conditions where this occur are:
- octword op
- ending address of DAWR range is less than starting address of op
- those addresses need to be in the same or in two consecutive 512B
blocks
- 'op address + 64B' generates an address that has a carry into bit
52 (crosses 2K boundary)
Handle such spurious exception by considering them as extraneous and
emulating/single-steeping instruction without generating an event.
[ravi: Fixed build warning reported by lkp@intel.com]
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201106045650.278987-1-ravi.bangoria@linux.ibm.com
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