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powerpc/watchpoint: Introduce macros for watchpoint length

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We are hadrcoding length everywhere in the watchpoint code. Introduce
macros for the length and use them.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191017093204.7511-2-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2019-10-17 15:01:58 +05:30 committed by Michael Ellerman
parent 4e706af3cd
commit b811be615c
4 changed files with 9 additions and 6 deletions
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3
arch/powerpc/include/asm/hw_breakpoint.h
View File

@ -33,6 +33,9 @@ struct arch_hw_breakpoint {
#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
HW_BRK_TYPE_HYP)
#define DABR_MAX_LEN 8
#define DAWR_MAX_LEN 512
#ifdef CONFIG_HAVE_HW_BREAKPOINT
#include <linux/kdebug.h>
#include <asm/reg.h>

4
arch/powerpc/kernel/hw_breakpoint.c
View File

@ -163,9 +163,9 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
*/
if (!ppc_breakpoint_available())
return -ENODEV;
length_max = 8; /* DABR */
length_max = DABR_MAX_LEN; /* DABR */
if (dawr_enabled()) {
length_max = 512 ; /* 64 doublewords */
length_max = DAWR_MAX_LEN; /* 64 doublewords */
/* DAWR region can't cross 512 boundary */
if ((attr->bp_addr >> 9) !=
((attr->bp_addr + attr->bp_len - 1) >> 9))

6
arch/powerpc/kernel/ptrace.c
View File

@ -2425,7 +2425,7 @@ static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
return -EIO;
hw_brk.address = data & (~HW_BRK_TYPE_DABR);
hw_brk.type = (data & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
hw_brk.len = 8;
hw_brk.len = DABR_MAX_LEN;
set_bp = (data) && (hw_brk.type & HW_BRK_TYPE_RDWR);
#ifdef CONFIG_HAVE_HW_BREAKPOINT
bp = thread->ptrace_bps[0];
@ -2456,7 +2456,7 @@ static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
/* Create a new breakpoint request if one doesn't exist already */
hw_breakpoint_init(&attr);
attr.bp_addr = hw_brk.address;
attr.bp_len = 8;
attr.bp_len = DABR_MAX_LEN;
arch_bp_generic_fields(hw_brk.type,
&attr.bp_type);
@ -2882,7 +2882,7 @@ static long ppc_set_hwdebug(struct task_struct *child,
brk.address = bp_info->addr & ~7UL;
brk.type = HW_BRK_TYPE_TRANSLATE;
brk.len = 8;
brk.len = DABR_MAX_LEN;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
brk.type |= HW_BRK_TYPE_READ;
if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)

2
arch/powerpc/xmon/xmon.c
View File

@ -933,7 +933,7 @@ static void insert_cpu_bpts(void)
if (dabr.enabled) {
brk.address = dabr.address;
brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
brk.len = 8;
brk.len = DABR_MAX_LEN;
__set_breakpoint(&brk);
}