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arm64/mm: Document write abort detection from ESR 

This patch adds an is_write_abort() wrapper and documents the detection
of the abort type on cache maintenance operations.

Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
[catalin.marinas@arm.com: only keep the is_write_abort() wrapper]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Anshuman Khandual 2019-06-07 14:43:05 +05:30 committed by Catalin Marinas
parent 8e01076afd
commit c49bd02f4c
1 changed files with 10 additions and 1 deletions
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11
arch/arm64/mm/fault.c
View File

@ -435,6 +435,15 @@ static bool is_el0_instruction_abort(unsigned int esr)
return ESR_ELx_EC(esr) == ESR_ELx_EC_IABT_LOW;
}
/*
* Note: not valid for EL1 DC IVAC, but we never use that such that it
* should fault. EL0 cannot issue DC IVAC (undef).
*/
static bool is_write_abort(unsigned int esr)
{
return (esr & ESR_ELx_WNR) && !(esr & ESR_ELx_CM);
}
static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
@ -460,7 +469,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
if (is_el0_instruction_abort(esr)) {
vm_flags = VM_EXEC;
mm_flags |= FAULT_FLAG_INSTRUCTION;
} else if ((esr & ESR_ELx_WNR) && !(esr & ESR_ELx_CM)) {
} else if (is_write_abort(esr)) {
vm_flags = VM_WRITE;
mm_flags |= FAULT_FLAG_WRITE;
}