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Message-Id: <20210330150425.10145-1-sxwjean@me.com>
Date: Tue, 30 Mar 2021 23:04:25 +0800
From: Xiongwei Song <sxwjean@...com>
To: mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
oleg@...hat.com, npiggin@...il.com, christophe.leroy@...roup.eu,
msuchanek@...e.de, aneesh.kumar@...ux.ibm.com,
ravi.bangoria@...ux.ibm.com, mikey@...ling.org,
haren@...ux.ibm.com, alistair@...ple.id.au, jniethe5@...il.com,
peterz@...radead.org, leobras.c@...il.com,
akpm@...ux-foundation.org, rppt@...nel.org, peterx@...hat.com,
atrajeev@...ux.vnet.ibm.com, maddy@...ux.ibm.com,
kjain@...ux.ibm.com, kan.liang@...ux.intel.com, aik@...abs.ru,
pmladek@...e.com, john.ogness@...utronix.de
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
kvm-ppc@...r.kernel.org, Xiongwei Song <sxwjean@...il.com>
Subject: [PATCH v2] powerpc/traps: Enhance readability for trap types
From: Xiongwei Song <sxwjean@...il.com>
Create a new header named traps.h, define macros to list ppc exception
types in traps.h, replace the reference of the real trap values with
these macros.
Signed-off-by: Xiongwei Song <sxwjean@...il.com>
---
arch/powerpc/include/asm/interrupt.h | 7 ++++---
arch/powerpc/include/asm/ptrace.h | 3 ++-
arch/powerpc/include/asm/traps.h | 19 +++++++++++++++++++
arch/powerpc/kernel/interrupt.c | 2 +-
arch/powerpc/kernel/process.c | 3 ++-
arch/powerpc/kernel/traps.c | 5 +++--
arch/powerpc/kexec/crash.c | 3 ++-
arch/powerpc/kvm/book3s_hv_builtin.c | 5 +++--
arch/powerpc/mm/book3s64/hash_utils.c | 5 +++--
arch/powerpc/mm/fault.c | 17 +++++++++--------
arch/powerpc/perf/core-book3s.c | 5 +++--
arch/powerpc/xmon/xmon.c | 21 +++++++++++----------
12 files changed, 62 insertions(+), 33 deletions(-)
create mode 100644 arch/powerpc/include/asm/traps.h
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index 7c633896d758..d4c935ba8e16 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -8,6 +8,7 @@
#include <asm/ftrace.h>
#include <asm/kprobes.h>
#include <asm/runlatch.h>
+#include <asm/traps.h>
struct interrupt_state {
#ifdef CONFIG_PPC_BOOK3E_64
@@ -59,7 +60,7 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup
* CT_WARN_ON comes here via program_check_exception,
* so avoid recursion.
*/
- if (TRAP(regs) != 0x700)
+ if (TRAP(regs) != TRAP_PROG)
CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
}
#endif
@@ -156,7 +157,7 @@ static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct inte
/* Don't do any per-CPU operations until interrupt state is fixed */
#endif
/* Allow DEC and PMI to be traced when they are soft-NMI */
- if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) {
+ if (TRAP(regs) != TRAP_DEC && TRAP(regs) != TRAP_PMI && TRAP(regs) != 0x260) {
state->ftrace_enabled = this_cpu_get_ftrace_enabled();
this_cpu_set_ftrace_enabled(0);
}
@@ -180,7 +181,7 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter
nmi_exit();
#ifdef CONFIG_PPC64
- if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260)
+ if (TRAP(regs) != TRAP_DEC && TRAP(regs) != TRAP_PMI && TRAP(regs) != 0x260)
this_cpu_set_ftrace_enabled(state->ftrace_enabled);
#ifdef CONFIG_PPC_BOOK3S_64
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index f10498e1b3f6..04726fb43a9d 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -21,6 +21,7 @@
#include <uapi/asm/ptrace.h>
#include <asm/asm-const.h>
+#include <asm/traps.h>
#ifndef __ASSEMBLY__
struct pt_regs
@@ -237,7 +238,7 @@ static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
static inline bool trap_is_syscall(struct pt_regs *regs)
{
- return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
+ return (trap_is_scv(regs) || TRAP(regs) == TRAP_SYSCALL);
}
static inline bool trap_norestart(struct pt_regs *regs)
diff --git a/arch/powerpc/include/asm/traps.h b/arch/powerpc/include/asm/traps.h
new file mode 100644
index 000000000000..a31b6122de23
--- /dev/null
+++ b/arch/powerpc/include/asm/traps.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_PPC_TRAPS_H
+#define _ASM_PPC_TRAPS_H
+
+#define TRAP_RESET 0x100 /* System reset */
+#define TRAP_MCE 0x200 /* Machine check */
+#define TRAP_DSI 0x300 /* Data storage */
+#define TRAP_DSEGI 0x380 /* Data segment */
+#define TRAP_ISI 0x400 /* Instruction storage */
+#define TRAP_ISEGI 0x480 /* Instruction segment */
+#define TRAP_ALIGN 0x600 /* Alignment */
+#define TRAP_PROG 0x700 /* Program */
+#define TRAP_DEC 0x900 /* Decrementer */
+#define TRAP_SYSCALL 0xc00 /* System call */
+#define TRAP_TRACEI 0xd00 /* Trace */
+#define TRAP_FPA 0xe00 /* Floating-point Assist */
+#define TRAP_PMI 0xf00 /* Performance monitor */
+
+#endif /* _ASM_PPC_TRAPS_H */
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index c4dd4b8f9cfa..fc9a40cbbcae 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -456,7 +456,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
* CT_WARN_ON comes here via program_check_exception,
* so avoid recursion.
*/
- if (TRAP(regs) != 0x700)
+ if (TRAP(regs) != TRAP_PROG)
CT_WARN_ON(ct_state() == CONTEXT_USER);
kuap = kuap_get_and_assert_locked();
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index b966c8e0cead..0d416744136f 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -64,6 +64,7 @@
#include <asm/asm-prototypes.h>
#include <asm/stacktrace.h>
#include <asm/hw_breakpoint.h>
+#include <asm/traps.h>
#include <linux/kprobes.h>
#include <linux/kdebug.h>
@@ -1469,7 +1470,7 @@ static void __show_regs(struct pt_regs *regs)
trap = TRAP(regs);
if (!trap_is_syscall(regs) && cpu_has_feature(CPU_FTR_CFAR))
pr_cont("CFAR: "REG" ", regs->orig_gpr3);
- if (trap == 0x200 || trap == 0x300 || trap == 0x600) {
+ if (trap == TRAP_MCE || trap == TRAP_DSI || trap == TRAP_ALIGN) {
if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE))
pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->dsisr);
else
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 76d17492e0e5..c9fa10e20140 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -67,6 +67,7 @@
#include <asm/kprobes.h>
#include <asm/stacktrace.h>
#include <asm/nmi.h>
+#include <asm/traps.h>
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE)
int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@ -221,7 +222,7 @@ static void oops_end(unsigned long flags, struct pt_regs *regs,
/*
* system_reset_excption handles debugger, crash dump, panic, for 0x100
*/
- if (TRAP(regs) == 0x100)
+ if (TRAP(regs) == TRAP_RESET)
return;
crash_fadump(regs, "die oops");
@@ -289,7 +290,7 @@ void die(const char *str, struct pt_regs *regs, long err)
/*
* system_reset_excption handles debugger, crash dump, panic, for 0x100
*/
- if (TRAP(regs) != 0x100) {
+ if (TRAP(regs) != TRAP_RESET) {
if (debugger(regs))
return;
}
diff --git a/arch/powerpc/kexec/crash.c b/arch/powerpc/kexec/crash.c
index c9a889880214..5246969e3f68 100644
--- a/arch/powerpc/kexec/crash.c
+++ b/arch/powerpc/kexec/crash.c
@@ -24,6 +24,7 @@
#include <asm/smp.h>
#include <asm/setjmp.h>
#include <asm/debug.h>
+#include <asm/traps.h>
/*
* The primary CPU waits a while for all secondary CPUs to enter. This is to
@@ -336,7 +337,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
* If we came in via system reset, wait a while for the secondary
* CPUs to enter.
*/
- if (TRAP(regs) == 0x100)
+ if (TRAP(regs) == TRAP_RESET)
mdelay(PRIMARY_TIMEOUT);
crash_kexec_prepare_cpus(crashing_cpu);
diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 158d309b42a3..795d4a2bc8e3 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -28,6 +28,7 @@
#include <asm/io.h>
#include <asm/opal.h>
#include <asm/smp.h>
+#include <asm/traps.h>
#define KVM_CMA_CHUNK_ORDER 18
@@ -639,11 +640,11 @@ void kvmppc_bad_interrupt(struct pt_regs *regs)
* 100 could happen at any time, 200 can happen due to invalid real
* address access for example (or any time due to a hardware problem).
*/
- if (TRAP(regs) == 0x100) {
+ if (TRAP(regs) == TRAP_RESET) {
get_paca()->in_nmi++;
system_reset_exception(regs);
get_paca()->in_nmi--;
- } else if (TRAP(regs) == 0x200) {
+ } else if (TRAP(regs) == TRAP_MCE) {
machine_check_exception(regs);
} else {
die("Bad interrupt in KVM entry/exit code", regs, SIGABRT);
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 7719995323c3..97ff82a1925f 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -64,6 +64,7 @@
#include <asm/pte-walk.h>
#include <asm/asm-prototypes.h>
#include <asm/ultravisor.h>
+#include <asm/traps.h>
#include <mm/mmu_decl.h>
@@ -1145,7 +1146,7 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
/* page is dirty */
if (!test_bit(PG_dcache_clean, &page->flags) && !PageReserved(page)) {
- if (trap == 0x400) {
+ if (trap == TRAP_ISI) {
flush_dcache_icache_page(page);
set_bit(PG_dcache_clean, &page->flags);
} else
@@ -1545,7 +1546,7 @@ DEFINE_INTERRUPT_HANDLER_RET(__do_hash_fault)
if (user_mode(regs) || (region_id == USER_REGION_ID))
access &= ~_PAGE_PRIVILEGED;
- if (TRAP(regs) == 0x400)
+ if (TRAP(regs) == TRAP_ISI)
access |= _PAGE_EXEC;
err = hash_page_mm(mm, ea, access, TRAP(regs), flags);
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 0c0b1c2cfb49..fae9c072e498 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -44,6 +44,7 @@
#include <asm/debug.h>
#include <asm/kup.h>
#include <asm/inst.h>
+#include <asm/traps.h>
/*
@@ -197,7 +198,7 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr,
static bool bad_kernel_fault(struct pt_regs *regs, unsigned long error_code,
unsigned long address, bool is_write)
{
- int is_exec = TRAP(regs) == 0x400;
+ int is_exec = TRAP(regs) == TRAP_ISI;
/* NX faults set DSISR_PROTFAULT on the 8xx, DSISR_NOEXEC_OR_G on others */
if (is_exec && (error_code & (DSISR_NOEXEC_OR_G | DSISR_KEYFAULT |
@@ -391,7 +392,7 @@ static int ___do_page_fault(struct pt_regs *regs, unsigned long address,
struct vm_area_struct * vma;
struct mm_struct *mm = current->mm;
unsigned int flags = FAULT_FLAG_DEFAULT;
- int is_exec = TRAP(regs) == 0x400;
+ int is_exec = TRAP(regs) == TRAP_ISI;
int is_user = user_mode(regs);
int is_write = page_fault_is_write(error_code);
vm_fault_t fault, major = 0;
@@ -588,20 +589,20 @@ void __bad_page_fault(struct pt_regs *regs, int sig)
/* kernel has accessed a bad area */
switch (TRAP(regs)) {
- case 0x300:
- case 0x380:
- case 0xe00:
+ case TRAP_DSI:
+ case TRAP_DSEGI:
+ case TRAP_FPA:
pr_alert("BUG: %s on %s at 0x%08lx\n",
regs->dar < PAGE_SIZE ? "Kernel NULL pointer dereference" :
"Unable to handle kernel data access",
is_write ? "write" : "read", regs->dar);
break;
- case 0x400:
- case 0x480:
+ case TRAP_ISI:
+ case TRAP_ISEGI:
pr_alert("BUG: Unable to handle kernel instruction fetch%s",
regs->nip < PAGE_SIZE ? " (NULL pointer?)\n" : "\n");
break;
- case 0x600:
+ case TRAP_ALIGN:
pr_alert("BUG: Unable to handle kernel unaligned access at 0x%08lx\n",
regs->dar);
break;
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 766f064f00fb..15fa471d8205 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -17,6 +17,7 @@
#include <asm/firmware.h>
#include <asm/ptrace.h>
#include <asm/code-patching.h>
+#include <asm/traps.h>
#ifdef CONFIG_PPC64
#include "internal.h"
@@ -168,7 +169,7 @@ static bool regs_use_siar(struct pt_regs *regs)
* they have not been setup using perf_read_regs() and so regs->result
* is something random.
*/
- return ((TRAP(regs) == 0xf00) && regs->result);
+ return ((TRAP(regs) == TRAP_PMI) && regs->result);
}
/*
@@ -347,7 +348,7 @@ static inline void perf_read_regs(struct pt_regs *regs)
* hypervisor samples as well as samples in the kernel with
* interrupts off hence the userspace check.
*/
- if (TRAP(regs) != 0xf00)
+ if (TRAP(regs) != TRAP_PMI)
use_siar = 0;
else if ((ppmu->flags & PPMU_NO_SIAR))
use_siar = 0;
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index bf7d69625a2e..570277c4d471 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -54,6 +54,7 @@
#include <asm/code-patching.h>
#include <asm/sections.h>
#include <asm/inst.h>
+#include <asm/traps.h>
#ifdef CONFIG_PPC64
#include <asm/hvcall.h>
@@ -605,7 +606,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
* debugger break (IPI). This is similar to
* crash_kexec_secondary().
*/
- if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
+ if (TRAP(regs) != TRAP_RESET || !wait_for_other_cpus(ncpus))
smp_send_debugger_break();
wait_for_other_cpus(ncpus);
@@ -615,7 +616,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
if (!locked_down) {
/* for breakpoint or single step, print curr insn */
- if (bp || TRAP(regs) == 0xd00)
+ if (bp || TRAP(regs) == TRAP_TRACEI)
ppc_inst_dump(regs->nip, 1, 0);
printf("enter ? for help\n");
}
@@ -684,7 +685,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
disable_surveillance();
if (!locked_down) {
/* for breakpoint or single step, print current insn */
- if (bp || TRAP(regs) == 0xd00)
+ if (bp || TRAP(regs) == TRAP_TRACEI)
ppc_inst_dump(regs->nip, 1, 0);
printf("enter ? for help\n");
}
@@ -1769,9 +1770,9 @@ static void excprint(struct pt_regs *fp)
printf(" sp: %lx\n", fp->gpr[1]);
printf(" msr: %lx\n", fp->msr);
- if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) {
+ if (trap == TRAP_DSI || trap == TRAP_DSEGI || trap == TRAP_ALIGN || trap == TRAP_MCE) {
printf(" dar: %lx\n", fp->dar);
- if (trap != 0x380)
+ if (trap != TRAP_DSEGI)
printf(" dsisr: %lx\n", fp->dsisr);
}
@@ -1785,7 +1786,7 @@ static void excprint(struct pt_regs *fp)
current->pid, current->comm);
}
- if (trap == 0x700)
+ if (trap == TRAP_PROG)
print_bug_trap(fp);
printf(linux_banner);
@@ -1846,7 +1847,7 @@ static void prregs(struct pt_regs *fp)
printf("ctr = "REG" xer = "REG" trap = %4lx\n",
fp->ctr, fp->xer, fp->trap);
trap = TRAP(fp);
- if (trap == 0x300 || trap == 0x380 || trap == 0x600)
+ if (trap == TRAP_DSI || trap == TRAP_DSEGI || trap == TRAP_ALIGN)
printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr);
}
@@ -2235,11 +2236,11 @@ static int handle_fault(struct pt_regs *regs)
{
fault_except = TRAP(regs);
switch (TRAP(regs)) {
- case 0x200:
+ case TRAP_MCE:
fault_type = 0;
break;
- case 0x300:
- case 0x380:
+ case TRAP_DSI:
+ case TRAP_DSEGI:
fault_type = 1;
break;
default:
--
2.17.1
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