[PATCH] arm64: mm: decode xFSC in mem_abort_decode()

[Mark Rutland]

It would be helpful if mem_abort_decode() could decode the DFSC/IFSC, as
this can make it easier to identify common bugs (e.g. accesses which
trigger alignment faults) without having to manually decode the xFSC
value.

Decode the xFSC in mem_abort_decode().

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Robin Murphy <wobin.murphy at arm.com>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/mm/fault.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index c10bf749c233..2fba5da62104 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -99,6 +99,8 @@ static void mem_abort_decode(unsigned int esr)
 	pr_alert("  EA = %lu, S1PTW = %lu\n",
 		 (esr & ESR_ELx_EA) >> ESR_ELx_EA_SHIFT,
 		 (esr & ESR_ELx_S1PTW) >> ESR_ELx_S1PTW_SHIFT);
+	pr_alert("  FSC = 0x%02x: %s\n", (esr & ESR_ELx_FSC),
+		 esr_to_fault_info(esr)->name);
 
 	if (esr_is_data_abort(esr))
 		data_abort_decode(esr);
-- 
2.11.0