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RAS: Introduce handler for Double Faults

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Double fault is when the PE receives another error whilst one is being
handled. To detect double fault condition, a per-CPU flag is introduced
to track the status of error handling. The flag is checked/modified
while temporarily masking external aborts on the PE.

This patch routes double faults to a separate platform-defined handler.

Change-Id: I70e9b7ba4c817273c55a0af978d9755ff32cc702
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
This commit is contained in:
Jeenu Viswambharan 2018-05-17 11:24:01 +01:00
parent b56dc2a98c
commit d5a23af50f
2 changed files with 32 additions and 3 deletions
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23
bl31/aarch64/ea_delegate.S
View file

@ -5,6 +5,7 @@
*/
#include <assert_macros.S>
#include <asm_macros.S>
#include <assert_macros.S>
#include <context.h>
@ -179,6 +180,15 @@ endfunc delegate_async_ea
* x1: EA syndrome
*/
func ea_proceed
/*
* If the ESR loaded earlier is not zero, we were processing an EA
* already, and this is a double fault.
*/
ldr x5, [sp, #CTX_EL3STATE_OFFSET + CTX_ESR_EL3]
cbz x5, 1f
no_ret plat_handle_double_fault
1:
/* Save EL3 state */
mrs x2, spsr_el3
mrs x3, elr_el3
@ -216,7 +226,6 @@ func ea_proceed
mov x28, sp
#endif
bl plat_ea_handler
mov x30, x29
#if ENABLE_ASSERTIONS
/*
@ -232,7 +241,7 @@ func ea_proceed
/* Make SP point to context */
msr spsel, #1
/* Restore EL3 state */
/* Restore EL3 state and ESR */
ldp x1, x2, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
msr spsr_el3, x1
msr elr_el3, x2
@ -242,5 +251,13 @@ func ea_proceed
msr scr_el3, x3
msr esr_el3, x4
ret
#if ENABLE_ASSERTIONS
cmp x4, xzr
ASM_ASSERT(ne)
#endif
/* Clear ESR storage */
str xzr, [sp, #CTX_EL3STATE_OFFSET + CTX_ESR_EL3]
ret x29
endfunc ea_proceed

12
plat/common/aarch64/platform_helpers.S
View file

@ -21,6 +21,7 @@
.weak bl32_plat_enable_mmu
.weak plat_handle_uncontainable_ea
.weak plat_handle_double_fault
#if !ENABLE_PLAT_COMPAT
.globl platform_get_core_pos
@ -200,3 +201,14 @@ endfunc bl32_plat_enable_mmu
func plat_handle_uncontainable_ea
b report_unhandled_exception
endfunc plat_handle_uncontainable_ea
/* -----------------------------------------------------
* Platform handler for Double Fault.
*
* x0: EA reason
* x1: EA syndrome
* -----------------------------------------------------
*/
func plat_handle_double_fault
b report_unhandled_exception
endfunc plat_handle_double_fault