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powerpc/watchpoint: Introduce function to get nr watchpoints dynamically

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So far we had only one watchpoint, so we have hardcoded HBP_NUM to 1.
But Power10 is introducing 2nd DAWR and thus kernel should be able to
dynamically find actual number of watchpoints supported by hw it's
running on. Introduce function for the same. Also convert HBP_NUM macro
to HBP_NUM_MAX, which will now represent maximum number of watchpoints
supported by Powerpc.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Link: https://lore.kernel.org/r/20200514111741.97993-4-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria
2020-05-14 16:47:28 +05:30
committed by Michael Ellerman
parent 4a4ec2289a
commit a6ba44e879
4 changed files with 12 additions and 3 deletions
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2
arch/powerpc/kernel/hw_breakpoint.c
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@@ -39,7 +39,7 @@ static DEFINE_PER_CPU(struct perf_event *, bp_per_reg);
int hw_breakpoint_slots(int type)
{
if (type == TYPE_DATA)
return HBP_NUM;
return nr_wp_slots();
return 0; /* no instruction breakpoints available */
}