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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2021-12-22 19:33:51 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-12-27 19:01:28 +0300 |
| commit | 1d4e0b3abb168b2ee1eca99c527cffa1b80b6161 (patch) | |
| tree | 3630ebea60ec4d2ba61b1ee68e7c0291bf192cd6 /drivers/acpi/acpica/hwesleep.c | |
| parent | 0acf24ad7e10f547809faefb8069f8f5482eb4d9 (diff) | |
| download | linux-1d4e0b3abb168b2ee1eca99c527cffa1b80b6161.tar.xz | |
ACPICA: Hardware: Do not flush CPU cache when entering S4 and S5
ACPICA commit 3dd7e1f3996456ef81bfe14cba29860e8d42949e
According to ACPI 6.4, Section 16.2, the CPU cache flushing is
required on entering to S1, S2, and S3, but the ACPICA code
flushes the CPU cache regardless of the sleep state.
Blind cache flush on entering S5 causes problems for TDX.
Flushing happens with WBINVD that is not supported in the TDX
environment.
TDX only supports S5 and adjusting ACPICA code to conform to the
spec more strictly fixes the issue.
Link: https://github.com/acpica/acpica/commit/3dd7e1f3
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/hwesleep.c')
| -rw-r--r-- | drivers/acpi/acpica/hwesleep.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/hwesleep.c b/drivers/acpi/acpica/hwesleep.c index 808fdf54aeeb..7ee2939c08cd 100644 --- a/drivers/acpi/acpica/hwesleep.c +++ b/drivers/acpi/acpica/hwesleep.c @@ -104,7 +104,9 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state) /* Flush caches, as per ACPI specification */ - ACPI_FLUSH_CPU_CACHE(); + if (sleep_state < ACPI_STATE_S4) { + ACPI_FLUSH_CPU_CACHE(); + } status = acpi_os_enter_sleep(sleep_state, sleep_control, 0); if (status == AE_CTRL_TERMINATE) { |