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Commit d7ba979d authored by Dongdong Deng's avatar Dongdong Deng Committed by Jason Wessel
Browse files

debug_core,x86,blackfin: Clean up hw debug disable API 



The kgdb_disable_hw_debug() was an architecture specific function for
disabling all hardware breakpoints on a per cpu basis when entering
the debug core.

This patch will remove the weak function kdbg_disable_hw_debug() and
change it into a call back which lives with the rest of hw breakpoint
call backs in struct kgdb_arch.

Signed-off-by: default avatarDongdong Deng <dongdong.deng@windriver.com>
Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
parent 578bd4df

arch/blackfin/kernel/kgdb.c

+2 −1
Original line number Diff line number Diff line
@@ -320,7 +320,7 @@ static void bfin_correct_hw_break(void) 
	}

}



void kgdb_disable_hw_debug(struct pt_regs *regs)

static void bfin_disable_hw_debug(struct pt_regs *regs)

{

	/* Disable hardware debugging while we are in kgdb */

	bfin_write_WPIACTL(0);
@@ -406,6 +406,7 @@ struct kgdb_arch arch_kgdb_ops = { 
#endif

	.set_hw_breakpoint = bfin_set_hw_break,

	.remove_hw_breakpoint = bfin_remove_hw_break,

	.disable_hw_break = bfin_disable_hw_debug,

	.remove_all_hw_break = bfin_remove_all_hw_break,

	.correct_hw_break = bfin_correct_hw_break,

};

arch/x86/kernel/kgdb.c

+2 −1
Original line number Diff line number Diff line
@@ -387,7 +387,7 @@ kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype) 
 *	disable hardware debugging while it is processing gdb packets or

 *	handling exception.

 */

void kgdb_disable_hw_debug(struct pt_regs *regs)

static void kgdb_disable_hw_debug(struct pt_regs *regs)

{

	int i;

	int cpu = raw_smp_processor_id();
@@ -724,6 +724,7 @@ struct kgdb_arch arch_kgdb_ops = { 
	.flags			= KGDB_HW_BREAKPOINT,

	.set_hw_breakpoint	= kgdb_set_hw_break,

	.remove_hw_breakpoint	= kgdb_remove_hw_break,

	.disable_hw_break	= kgdb_disable_hw_debug,

	.remove_all_hw_break	= kgdb_remove_all_hw_break,

	.correct_hw_break	= kgdb_correct_hw_break,

};

include/linux/kgdb.h

+3 −10
Original line number Diff line number Diff line
@@ -35,16 +35,6 @@ struct pt_regs; 
 */

extern int kgdb_skipexception(int exception, struct pt_regs *regs);



/**

 *	kgdb_disable_hw_debug - (optional) Disable hardware debugging hook

 *	@regs: Current &struct pt_regs.

 *

 *	This function will be called if the particular architecture must

 *	disable hardware debugging while it is processing gdb packets or

 *	handling exception.

 */

extern void kgdb_disable_hw_debug(struct pt_regs *regs);



struct tasklet_struct;

struct task_struct;

struct uart_port;
@@ -243,6 +233,8 @@ extern void kgdb_arch_late(void); 
 * breakpoint.

 * @remove_hw_breakpoint: Allow an architecture to specify how to remove a

 * hardware breakpoint.

 * @disable_hw_break: Allow an architecture to specify how to disable

 * hardware breakpoints for a single cpu.

 * @remove_all_hw_break: Allow an architecture to specify how to remove all

 * hardware breakpoints.

 * @correct_hw_break: Allow an architecture to specify how to correct the
@@ -256,6 +248,7 @@ struct kgdb_arch { 
	int	(*remove_breakpoint)(unsigned long, char *);

	int	(*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);

	int	(*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);

	void	(*disable_hw_break)(struct pt_regs *regs);

	void	(*remove_all_hw_break)(void);

	void	(*correct_hw_break)(void);

};

kernel/debug/debug_core.c

+3 −13
Original line number Diff line number Diff line
@@ -209,18 +209,6 @@ int __weak kgdb_skipexception(int exception, struct pt_regs *regs) 
	return 0;

}



/**

 *	kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.

 *	@regs: Current &struct pt_regs.

 *

 *	This function will be called if the particular architecture must

 *	disable hardware debugging while it is processing gdb packets or

 *	handling exception.

 */

void __weak kgdb_disable_hw_debug(struct pt_regs *regs)

{

}



/*

 * Some architectures need cache flushes when we set/clear a

 * breakpoint:
@@ -484,7 +472,9 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs, 
		atomic_inc(&masters_in_kgdb);

	else

		atomic_inc(&slaves_in_kgdb);

	kgdb_disable_hw_debug(ks->linux_regs);



	if (arch_kgdb_ops.disable_hw_break)

		arch_kgdb_ops.disable_hw_break(regs);



acquirelock:

	/*