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authorTyler Baicar <tbaicar@codeaurora.org>2017-06-21 12:17:08 -0600
committerWill Deacon <will.deacon@arm.com>2017-06-22 18:21:46 +0100
commit32015c235603a209697d1228667b1fb1cc8a8d06 (patch)
tree174a3293200843e44853872a3d230bf47dc3fdcc /arch/arm64/mm
parentefi: parse ARM processor error (diff)
downloadlinux-dev-32015c235603a209697d1228667b1fb1cc8a8d06.tar.xz
linux-dev-32015c235603a209697d1228667b1fb1cc8a8d06.zip
arm64: exception: handle Synchronous External Abort
SEA exceptions are often caused by an uncorrected hardware error, and are handled when data abort and instruction abort exception classes have specific values for their Fault Status Code. When SEA occurs, before killing the process, report the error in the kernel logs. Update fault_info[] with specific SEA faults so that the new SEA handler is used. Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org> Reviewed-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> [will: use NULL instead of 0 when assigning si_addr] Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/fault.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 37b95dff0b07..246e64f60610 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -522,6 +522,31 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
return 1;
}
+/*
+ * This abort handler deals with Synchronous External Abort.
+ * It calls notifiers, and then returns "fault".
+ */
+static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+ struct siginfo info;
+ const struct fault_info *inf;
+
+ inf = esr_to_fault_info(esr);
+ pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
+ inf->name, esr, addr);
+
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = 0;
+ if (esr & ESR_ELx_FnV)
+ info.si_addr = NULL;
+ else
+ info.si_addr = (void __user *)addr;
+ arm64_notify_die("", regs, &info, esr);
+
+ return 0;
+}
+
static const struct fault_info fault_info[] = {
{ do_bad, SIGBUS, 0, "ttbr address size fault" },
{ do_bad, SIGBUS, 0, "level 1 address size fault" },
@@ -539,22 +564,22 @@ static const struct fault_info fault_info[] = {
{ do_page_fault, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" },
{ do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" },
{ do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 permission fault" },
- { do_bad, SIGBUS, 0, "synchronous external abort" },
+ { do_sea, SIGBUS, 0, "synchronous external abort" },
{ do_bad, SIGBUS, 0, "unknown 17" },
{ do_bad, SIGBUS, 0, "unknown 18" },
{ do_bad, SIGBUS, 0, "unknown 19" },
- { do_bad, SIGBUS, 0, "synchronous external abort (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous external abort (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous external abort (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous external abort (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous parity error" },
+ { do_sea, SIGBUS, 0, "level 0 (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 1 (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 2 (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 3 (translation table walk)" },
+ { do_sea, SIGBUS, 0, "synchronous parity or ECC error" },
{ do_bad, SIGBUS, 0, "unknown 25" },
{ do_bad, SIGBUS, 0, "unknown 26" },
{ do_bad, SIGBUS, 0, "unknown 27" },
- { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" },
- { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 0 synchronous parity error (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 1 synchronous parity error (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 2 synchronous parity error (translation table walk)" },
+ { do_sea, SIGBUS, 0, "level 3 synchronous parity error (translation table walk)" },
{ do_bad, SIGBUS, 0, "unknown 32" },
{ do_alignment_fault, SIGBUS, BUS_ADRALN, "alignment fault" },
{ do_bad, SIGBUS, 0, "unknown 34" },