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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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6
arch/powerpc/include/asm/cputable.h
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@@ -614,7 +614,11 @@ enum {
};
#endif /* __powerpc64__ */
#define HBP_NUM 1
/*
* Maximum number of hw breakpoint supported on powerpc. Number of
* breakpoints supported by actual hw might be less than this.
*/
#define HBP_NUM_MAX 1
#endif /* !__ASSEMBLY__ */