Djam/arm-trusted-firmware
1
0
Fork 0
mirror of https://github.com/ARM-software/arm-trusted-firmware.git synced 2025-05-08 10:08:47 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

PSCI: Introduce cache and barrier wrappers

Browse source 
The PSCI implementation performs cache maintenance operations on its
data structures to ensure their visibility to both cache-coherent and
non-cache-coherent participants. These cache maintenance operations
can be skipped if all PSCI participants are cache-coherent. When
HW_ASSISTED_COHERENCY build option is enabled, we assume PSCI
participants are cache-coherent.

For usage abstraction, this patch introduces wrappers for PSCI cache
maintenance and barrier operations used for state coordination: they are
effectively NOPs when HW_ASSISTED_COHERENCY is enabled, but are
applied otherwise.

Also refactor local state usage and associated cache operations to make
it clearer.

Change-Id: I77f17a90cba41085b7188c1345fe5731c99fad87
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
This commit is contained in:
Jeenu Viswambharan 2017-01-06 14:58:11 +00:00
parent d4593e4713
commit a10d3632ac
5 changed files with 85 additions and 39 deletions
Download patch file Download diff file Expand all files Collapse all files

12
lib/psci/psci_off.c
View file

@ -154,17 +154,17 @@ exit:
*/
if (rc == PSCI_E_SUCCESS) {
/*
* Set the affinity info state to OFF. This writes directly to
* main memory as caches are disabled, so cache maintenance is
* Set the affinity info state to OFF. When caches are disabled,
* this writes directly to main memory, so cache maintenance is
* required to ensure that later cached reads of aff_info_state
* return AFF_STATE_OFF. A dsbish() ensures ordering of the
* return AFF_STATE_OFF. A dsbish() ensures ordering of the
* update to the affinity info state prior to cache line
* invalidation.
*/
flush_cpu_data(psci_svc_cpu_data.aff_info_state);
psci_flush_cpu_data(psci_svc_cpu_data.aff_info_state);
psci_set_aff_info_state(AFF_STATE_OFF);
dsbish();
inv_cpu_data(psci_svc_cpu_data.aff_info_state);
psci_dsbish();
psci_inv_cpu_data(psci_svc_cpu_data.aff_info_state);
#if ENABLE_RUNTIME_INSTRUMENTATION