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powerpc/watchpoint: Provide DAWR number to __set_breakpoint

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Introduce new parameter 'nr' to __set_breakpoint() which indicates
which DAWR should be programed. Also convert current_brk variable
to an array.

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/20200514111741.97993-7-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria
2020-05-14 16:47:31 +05:30
committed by Michael Ellerman
parent a18b834625
commit 4a8a9379f2
6 changed files with 15 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/kernel/hw_breakpoint.c
View File

@@ -64,7 +64,7 @@ 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_breakpoint(info);
__set_breakpoint(0, info);
return 0;
}
@@ -222,7 +222,7 @@ 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_breakpoint(info);
__set_breakpoint(0, info);
tsk->thread.last_hit_ubp = NULL;
}
@@ -347,7 +347,7 @@ int hw_breakpoint_handler(struct die_args *args)
if (!(info->type & HW_BRK_TYPE_EXTRANEOUS_IRQ))
perf_bp_event(bp, regs);
__set_breakpoint(info);
__set_breakpoint(0, info);
out:
rcu_read_unlock();
return rc;
@@ -380,7 +380,7 @@ static int single_step_dabr_instruction(struct die_args *args)
if (!(info->type & HW_BRK_TYPE_EXTRANEOUS_IRQ))
perf_bp_event(bp, regs);
__set_breakpoint(info);
__set_breakpoint(0, info);
current->thread.last_hit_ubp = NULL;
/*

14
arch/powerpc/kernel/process.c
View File

@@ -637,7 +637,7 @@ void do_break (struct pt_regs *regs, unsigned long address,
}
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
static DEFINE_PER_CPU(struct arch_hw_breakpoint, current_brk);
static DEFINE_PER_CPU(struct arch_hw_breakpoint, current_brk[HBP_NUM_MAX]);
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
/*
@@ -714,7 +714,7 @@ EXPORT_SYMBOL_GPL(switch_booke_debug_regs);
static void set_breakpoint(struct arch_hw_breakpoint *brk)
{
preempt_disable();
__set_breakpoint(brk);
__set_breakpoint(0, brk);
preempt_enable();
}
@@ -800,13 +800,13 @@ static inline int set_breakpoint_8xx(struct arch_hw_breakpoint *brk)
return 0;
}
void __set_breakpoint(struct arch_hw_breakpoint *brk)
void __set_breakpoint(int nr, struct arch_hw_breakpoint *brk)
{
memcpy(this_cpu_ptr(&current_brk), brk, sizeof(*brk));
memcpy(this_cpu_ptr(&current_brk[nr]), brk, sizeof(*brk));
if (dawr_enabled())
// Power8 or later
set_dawr(0, brk);
set_dawr(nr, brk);
else if (IS_ENABLED(CONFIG_PPC_8xx))
set_breakpoint_8xx(brk);
else if (!cpu_has_feature(CPU_FTR_ARCH_207S))
@@ -1174,8 +1174,8 @@ struct task_struct *__switch_to(struct task_struct *prev,
* schedule DABR
*/
#ifndef CONFIG_HAVE_HW_BREAKPOINT
if (unlikely(!hw_brk_match(this_cpu_ptr(&current_brk), &new->thread.hw_brk)))
__set_breakpoint(&new->thread.hw_brk);
if (unlikely(!hw_brk_match(this_cpu_ptr(&current_brk[0]), &new->thread.hw_brk)))
__set_breakpoint(0, &new->thread.hw_brk);
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif

2
arch/powerpc/kernel/signal.c
View File

@@ -272,7 +272,7 @@ static void do_signal(struct task_struct *tsk)
* triggered inside the kernel.
*/
if (tsk->thread.hw_brk.address && tsk->thread.hw_brk.type)
__set_breakpoint(&tsk->thread.hw_brk);
__set_breakpoint(0, &tsk->thread.hw_brk);
#endif
/* Re-enable the breakpoints for the signal stack */
thread_change_pc(tsk, tsk->thread.regs);