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arm-trusted-firmware/lib/cpus/aarch64
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Boyan Karatotev 45c7328c0b fix(cpus): avoid SME related loss of context on powerdown 
Travis' and Gelas' TRMs tell us to disable SME (set PSTATE.{ZA, SM} to
0) when we're attempting to power down. What they don't tell us is that
if this isn't done, the powerdown request will be rejected. On the
CPU_OFF path that's not a problem - we can force SVCR to 0 and be
certain the core will power off.

On the suspend to powerdown path, however, we cannot do this. The TRM
also tells us that the sequence could also be aborted on eg. GIC
interrupts. If this were to happen when we have overwritten SVCR to 0,
upon a return to the caller they would experience a loss of context. We
know that at least Linux may call into PSCI with SVCR != 0. One option
is to save the entire SME context which would be quite expensive just to
work around. Another option is to downgrade the request to a normal
suspend when SME was left on. This option is better as this is expected
to happen rarely enough to ignore the wasted power and we don't want to
burden the generic (correct) path with needless context management.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I698fa8490ebf51461f6aa8bba84f9827c5c46ad4
2025-02-03 14:29:47 +00:00
..
a64fx.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
aem_generic.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a35.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a53.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a55.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a57.S chore(cpus): optimise runtime errata applications 2024-10-16 13:59:57 +01:00
cortex_a65.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a65ae.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a72.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a73.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a75.S fix(cpus): modify the fix for Cortex-A75 erratum 764081 2024-10-03 10:07:47 -05:00
cortex_a75_pubsub.c chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
cortex_a76.S chore(cpus): optimise runtime errata applications 2024-10-16 13:59:57 +01:00
cortex_a76ae.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a77.S fix(cpus): workaround for CVE-2024-5660 for Cortex-A77 2024-12-17 10:28:09 -06:00
cortex_a78.S fix(cpus): workaround for CVE-2024-5660 for Cortex-A78 2024-12-17 10:28:09 -06:00
cortex_a78_ae.S fix(cpus): workaround for CVE-2024-5660 for Cortex-A78_AE 2024-12-17 10:28:09 -06:00
cortex_a78c.S fix(cpus): workaround for CVE-2024-5660 for Cortex-A78C 2024-12-17 10:28:09 -06:00
cortex_a510.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a520.S Merge changes from topic "clean-up-errata-compatibility" into integration 2024-08-27 16:23:58 +02:00
cortex_a710.S refactor(cpus): undo errata mitigations 2025-02-03 07:37:58 +00:00
cortex_a715.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_a720.S Merge changes from topic "clean-up-errata-compatibility" into integration 2024-08-27 16:23:58 +02:00
cortex_a720_ae.S feat(cpus): add support for cortex-a720ae 2024-10-21 15:20:34 +01:00
cortex_a725.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
cortex_alto.S fix(cpus): avoid SME related loss of context on powerdown 2025-02-03 14:29:47 +00:00
cortex_arcadia.S feat(cpus): add support for arcadia cpu 2024-10-17 09:34:03 -05:00
cortex_gelas.S fix(cpus): avoid SME related loss of context on powerdown 2025-02-03 14:29:47 +00:00
cortex_x1.S fix(cpus): workaround for CVE-2024-5660 for Cortex-X1 2024-12-17 10:28:09 -06:00
cortex_x2.S fix(cpus): workaround for CVE-2024-5660 for Cortex-X2 2024-12-17 10:28:09 -06:00
cortex_x3.S refactor(cpus): undo errata mitigations 2025-02-03 07:37:58 +00:00
cortex_x4.S fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus 2025-01-30 16:45:35 -06:00
cortex_x925.S fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus 2025-01-30 16:45:35 -06:00
cpu_helpers.S fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus 2025-01-30 16:45:35 -06:00
cpuamu.c Sanitise includes across codebase 2019-01-04 10:43:17 +00:00
cpuamu_helpers.S chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
denver.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
dsu_helpers.S feat(rockchip): add RK3566/RK3568 Socs support 2024-06-07 11:59:46 +02:00
generic.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
neoverse_e1.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
neoverse_n1.S chore(cpus): optimise runtime errata applications 2024-10-16 13:59:57 +01:00
neoverse_n1_pubsub.c chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
neoverse_n2.S refactor(cpus): undo errata mitigations 2025-02-03 07:37:58 +00:00
neoverse_n3.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
neoverse_n_common.S Add support for Neoverse-N2 CPUs. 2020-11-30 19:12:56 +00:00
neoverse_v1.S fix(cpus): workaround for CVE-2024-5660 for Neoverse-V1 2024-12-17 10:28:09 -06:00
neoverse_v2.S fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus 2025-01-30 16:45:35 -06:00
neoverse_v3.S fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus 2025-01-30 16:45:35 -06:00
nevis.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
qemu_max.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
rainier.S refactor(cpus): remove cpu specific errata funcs 2024-07-26 11:19:52 +01:00
travis.S fix(cpus): avoid SME related loss of context on powerdown 2025-02-03 14:29:47 +00:00
wa_cve_2017_5715_bpiall.S chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
wa_cve_2017_5715_mmu.S chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
wa_cve_2022_23960_bhb.S chore: update to use Arm word across TF-A 2023-08-08 15:12:30 +01:00
wa_cve_2022_23960_bhb_vector.S fix(security): workaround for CVE-2022-23960 2022-03-10 23:57:14 -06:00