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s390/mm: Let dump_fault_info() print additional information

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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 <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-11-03 16:25:33 +01:00
parent 76502abca2
commit b60d126c8e
1 changed files with 10 additions and 1 deletions
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11
arch/s390/mm/fault.c
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@ -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: