From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: rafael@kernel.org
Cc: ak@linux.intel.com, bp@alien8.de, dan.j.williams@intel.com,
dave.hansen@linux.intel.com, hpa@zytor.com,
kirill.shutemov@linux.intel.com, knsathya@kernel.org,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
mingo@redhat.com, rjw@rjwysocki.net,
sathyanarayanan.kuppuswamy@linux.intel.com, tglx@linutronix.de,
tony.luck@intel.com, x86@kernel.org
Subject: [PATCH 3/4] ACPI: processor idle: Only flush cache on entering C3
Date: Mon, 6 Dec 2021 15:29:51 +0300 [thread overview]
Message-ID: <20211206122952.74139-4-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20211206122952.74139-1-kirill.shutemov@linux.intel.com>
According to the ACPI spec v6.4, section 8.2, cache flushing required
on entering C3 power state.
Avoid flushing cache on entering other power states.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
drivers/acpi/processor_idle.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 76ef1bcc8848..01495aca850e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -567,7 +567,8 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
{
struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
- ACPI_FLUSH_CPU_CACHE();
+ if (cx->type == ACPI_STATE_C3)
+ ACPI_FLUSH_CPU_CACHE();
while (1) {
--
2.32.0
next prev parent reply other threads:[~2021-12-06 12:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 0:50 [PATCH v1 1/1] x86: Skip WBINVD instruction for VM guest Kuppuswamy Sathyanarayanan
2021-11-16 16:24 ` Borislav Petkov
2021-11-16 16:36 ` Sathyanarayanan Kuppuswamy
2021-11-19 4:03 ` [PATCH v2] " Kuppuswamy Sathyanarayanan
2021-11-25 0:40 ` Thomas Gleixner
2021-12-02 22:21 ` Kirill A. Shutemov
2021-12-02 22:38 ` Dave Hansen
2021-12-02 23:48 ` Thomas Gleixner
2021-12-03 23:49 ` Kirill A. Shutemov
2021-12-04 0:20 ` Dave Hansen
2021-12-04 0:54 ` Kirill A. Shutemov
2021-12-06 15:35 ` Dave Hansen
2021-12-06 16:39 ` Dan Williams
2021-12-06 16:53 ` Dave Hansen
2021-12-06 17:51 ` Dan Williams
2021-12-04 20:27 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 0/4] ACPI/ACPICA: Only flush caches on S1/S2/S3 and C3 Kirill A. Shutemov
2021-12-06 12:29 ` [PATCH 1/4] ACPICA: Do not flush cache for on entering S4 and S5 Kirill A. Shutemov
2021-12-08 14:58 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 2/4] ACPI: PM: Remove redundant cache flushing Kirill A. Shutemov
2021-12-07 16:35 ` Rafael J. Wysocki
2021-12-09 13:32 ` Kirill A. Shutemov
2021-12-17 18:04 ` Rafael J. Wysocki
2021-12-06 12:29 ` Kirill A. Shutemov [this message]
2021-12-06 15:03 ` [PATCH 3/4] ACPI: processor idle: Only flush cache on entering C3 Peter Zijlstra
2021-12-08 16:26 ` Rafael J. Wysocki
2021-12-09 13:33 ` Kirill A. Shutemov
2021-12-17 17:58 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 4/4] ACPI: PM: Avoid cache flush on entering S4 Kirill A. Shutemov
2021-12-08 15:10 ` Rafael J. Wysocki
2021-12-08 16:04 ` Kirill A. Shutemov
2021-12-08 16:16 ` Rafael J. Wysocki
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