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RAS: Add fault injection support

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The ARMv8.4 RAS extensions introduce architectural support for software
to inject faults into the system in order to test fault-handling
software. This patch introduces the build option FAULT_HANDLING_SUPPORT
to allow for lower ELs to use registers in the Standard Error Record to
inject fault. The build option RAS_EXTENSIONS must also be enabled along
with fault injection.

This feature is intended for testing purposes only, and is advisable to
keep disabled for production images.

Change-Id: I6f7a4454b15aec098f9505a10eb188c2f928f7ea
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
This commit is contained in:
Jeenu Viswambharan 2017-12-08 12:13:51 +00:00
parent ca6d918582
commit 1a7c1cfe70
5 changed files with 26 additions and 0 deletions
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9
Makefile
View File

@ -395,6 +395,13 @@ ifeq ($(RAS_EXTENSION),1)
endif
endif
# When FAULT_INJECTION_SUPPORT is used, require that RAS_EXTENSION is enabled
ifeq ($(FAULT_INJECTION_SUPPORT),1)
ifneq ($(RAS_EXTENSION),1)
$(error For FAULT_INJECTION_SUPPORT, RAS_EXTENSION must also be 1)
endif
endif
################################################################################
# Process platform overrideable behaviour
################################################################################
@ -522,6 +529,7 @@ $(eval $(call assert_boolean,ENABLE_SPE_FOR_LOWER_ELS))
$(eval $(call assert_boolean,ENABLE_SPM))
$(eval $(call assert_boolean,ENABLE_SVE_FOR_NS))
$(eval $(call assert_boolean,ERROR_DEPRECATED))
$(eval $(call assert_boolean,FAULT_INJECTION_SUPPORT))
$(eval $(call assert_boolean,GENERATE_COT))
$(eval $(call assert_boolean,GICV2_G0_FOR_EL3))
$(eval $(call assert_boolean,HANDLE_EA_EL3_FIRST))
@ -571,6 +579,7 @@ $(eval $(call add_define,ENABLE_SPE_FOR_LOWER_ELS))
$(eval $(call add_define,ENABLE_SPM))
$(eval $(call add_define,ENABLE_SVE_FOR_NS))
$(eval $(call add_define,ERROR_DEPRECATED))
$(eval $(call add_define,FAULT_INJECTION_SUPPORT))
$(eval $(call add_define,GICV2_G0_FOR_EL3))
$(eval $(call add_define,HANDLE_EA_EL3_FIRST))
$(eval $(call add_define,HW_ASSISTED_COHERENCY))

8
docs/user-guide.rst
View File

@ -390,6 +390,14 @@ Common build options
handled at EL3, and a panic will result. This is supported only for AArch64
builds.
- ``FAULT_INJECTION_SUPPORT``: ARMv8.4 externsions introduced support for fault
injection from lower ELs, and this build option enables lower ELs to use
Error Records accessed via System Registers to inject faults. This is
applicable only to AArch64 builds.
This feature is intended for testing purposes only, and is advisable to keep
disabled for production images.
- ``FIP_NAME``: This is an optional build option which specifies the FIP
filename for the ``fip`` target. Default is ``fip.bin``.

1
include/lib/aarch64/arch.h
View File

@ -215,6 +215,7 @@
/* SCR definitions */
#define SCR_RES1_BITS ((U(1) << 4) | (U(1) << 5))
#define SCR_FIEN_BIT (U(1) << 21)
#define SCR_TWE_BIT (U(1) << 13)
#define SCR_TWI_BIT (U(1) << 12)
#define SCR_ST_BIT (U(1) << 11)

5
lib/el3_runtime/aarch64/context_mgmt.c
View File

@ -114,6 +114,11 @@ static void cm_init_context_common(cpu_context_t *ctx, const entry_point_info_t
scr_el3 &= ~SCR_EA_BIT;
#endif
#if FAULT_INJECTION_SUPPORT
/* Enable fault injection from lower ELs */
scr_el3 |= SCR_FIEN_BIT;
#endif
#ifdef IMAGE_BL31
/*
* SCR_EL3.IRQ, SCR_EL3.FIQ: Enable the physical FIQ and IRQ rounting as

3
make_helpers/defaults.mk
View File

@ -76,6 +76,9 @@ EL3_EXCEPTION_HANDLING := 0
# Build flag to treat usage of deprecated platform and framework APIs as error.
ERROR_DEPRECATED := 0
# Fault injection support
FAULT_INJECTION_SUPPORT := 0
# Byte alignment that each component in FIP is aligned to
FIP_ALIGN := 0