From b60d126c8ea3444d8c1f29538542d5c03d219e3e Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 3 Nov 2025 16:25:33 +0100 Subject: [PATCH] s390/mm: Let dump_fault_info() print additional information Let dump_fault_info() print additional information to make debugging easier: Print "FSI" if the access-exception-fetch/store-indication facility is installed. If it is installed the TEID may also indicate if an exception happened because of a fetch or a store operation. Print "SOP", "ESOP-1", or "ESOP-2" depending on the type of the installed Suppression-on-Protection facility. This also gives additional information about the validity and meaning of the TEID bits. The output is changed from something like: Failing address: 0000000000000000 TEID: 0000000000000803 to Failing address: 0000000000000000 TEID: 0000000000000803 ESOP-2 FSI Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens --- arch/s390/mm/fault.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 639c4f610fdd7..20804f1f781a4 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -133,8 +133,17 @@ static void dump_fault_info(struct pt_regs *regs) union teid teid = { .val = regs->int_parm_long }; unsigned long asce; - pr_alert("Failing address: %016lx TEID: %016lx\n", + pr_alert("Failing address: %016lx TEID: %016lx", get_fault_address(regs), teid.val); + if (test_facility(131)) + pr_cont(" ESOP-2"); + else if (machine_has_esop()) + pr_cont(" ESOP-1"); + else + pr_cont(" SOP"); + if (test_facility(75)) + pr_cont(" FSI"); + pr_cont("\n"); pr_alert("Fault in "); switch (teid.as) { case PSW_BITS_AS_HOME: -- 2.47.3