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powerpc: Change hardware breakpoint to allow longer ranges

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Change the hardware breakpoint code so that we can support wider ranged
breakpoints.

This means both ptrace and perf hardware breakpoints can use upto 512 byte long
breakpoints when using the DAWR and only 8 byte when using the DABR.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2013-01-24 15:02:59 +00:00 committed by Benjamin Herrenschmidt
parent 05d694ea0d
commit 4ae7ebe952
2 changed files with 10 additions and 4 deletions
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2
arch/powerpc/include/asm/hw_breakpoint.h
View file

@ -57,8 +57,6 @@ struct pmu;
struct perf_sample_data;
#define HW_BREAKPOINT_ALIGN 0x7
/* Maximum permissible length of any HW Breakpoint */
#define HW_BREAKPOINT_LEN 0x8
extern int hw_breakpoint_slots(int type);
extern int arch_bp_generic_fields(int type, int *gen_bp_type);

12
arch/powerpc/kernel/hw_breakpoint.c
View file

@ -142,7 +142,7 @@ int arch_bp_generic_fields(int type, int *gen_bp_type)
*/
int arch_validate_hwbkpt_settings(struct perf_event *bp)
{
int ret = -EINVAL;
int ret = -EINVAL, length_max;
struct arch_hw_breakpoint *info = counter_arch_bp(bp);
if (!bp)
@ -171,8 +171,16 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
* HW_BREAKPOINT_ALIGN by rounding off to the lower address, the
* 'symbolsize' should satisfy the check below.
*/
length_max = 8; /* DABR */
if (cpu_has_feature(CPU_FTR_DAWR)) {
length_max = 512 ; /* 64 doublewords */
/* DAWR region can't cross 512 boundary */
if ((bp->attr.bp_addr >> 10) !=
((bp->attr.bp_addr + bp->attr.bp_len) >> 10))
return -EINVAL;
}
if (info->len >
(HW_BREAKPOINT_LEN - (info->address & HW_BREAKPOINT_ALIGN)))
(length_max - (info->address & HW_BREAKPOINT_ALIGN)))
return -EINVAL;
return 0;
}