diff options
| author | Michael Neuling <mikey@neuling.org> | 2012-09-06 21:24:57 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-10 09:59:13 +1000 |
| commit | cd14457304c9d232267a3a76a2a43f1f791e545d (patch) | |
| tree | defabdab4b813faf7bcd083f8670020cf799003c /arch/powerpc/kernel/hw_breakpoint.c | |
| parent | 4474ef055c5d8cb8eaf002d69e49af71e3aa3a88 (diff) | |
powerpc: Dynamically calculate the dabrx based on kernel/user/hypervisor
Currently we mark the DABRX to interrupt on all matches
(hypervisor/kernel/user and then filter in software. We can be a lot
smarter now that we can set the DABRX dynamically.
This sets the DABRX based on the flags passed by the user.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/powerpc/kernel/hw_breakpoint.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index 6891d79ecef..a89cae481b0 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -73,7 +73,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp) * If so, DABR will be populated in single_step_dabr_instruction(). */ if (current->thread.last_hit_ubp != bp) - set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL); + set_dabr(info->address | info->type | DABR_TRANSLATION, info->dabrx); return 0; } @@ -170,6 +170,13 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp) info->address = bp->attr.bp_addr; info->len = bp->attr.bp_len; + info->dabrx = DABRX_ALL; + if (bp->attr.exclude_user) + info->dabrx &= ~DABRX_USER; + if (bp->attr.exclude_kernel) + info->dabrx &= ~DABRX_KERNEL; + if (bp->attr.exclude_hv) + info->dabrx &= ~DABRX_HYP; /* * Since breakpoint length can be a maximum of HW_BREAKPOINT_LEN(8) @@ -197,7 +204,7 @@ void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs) info = counter_arch_bp(tsk->thread.last_hit_ubp); regs->msr &= ~MSR_SE; - set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL); + set_dabr(info->address | info->type | DABR_TRANSLATION, info->dabrx); tsk->thread.last_hit_ubp = NULL; } @@ -281,7 +288,7 @@ int __kprobes hw_breakpoint_handler(struct die_args *args) if (!info->extraneous_interrupt) perf_bp_event(bp, regs); - set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL); + set_dabr(info->address | info->type | DABR_TRANSLATION, info->dabrx); out: rcu_read_unlock(); return rc; @@ -313,7 +320,7 @@ int __kprobes single_step_dabr_instruction(struct die_args *args) if (!info->extraneous_interrupt) perf_bp_event(bp, regs); - set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL); + set_dabr(info->address | info->type | DABR_TRANSLATION, info->dabrx); current->thread.last_hit_ubp = NULL; /* |