linux-kernel - [RFC PATCH 03/26] psci: Export psci_cpu_suspend

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Message-Id: <20201104183630.27513-4-dbrazdil@google.com>
Date:   Wed,  4 Nov 2020 18:36:07 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Quentin Perret <qperret@...gle.com>,
        Andrew Scull <ascull@...gle.com>, kernel-team@...roid.com,
        David Brazdil <dbrazdil@...gle.com>
Subject: [RFC PATCH 03/26] psci: Export psci_cpu_suspend_feature

KVM's PSCI proxy could probe the firmware to establish features
supported for CPU_SUSPEND, but since the kernel's PSCI driver already
does that, and other information about the driver is already exported,
export the value of psci_cpu_suspend_feature as well for convenience.

Signed-off-by: David Brazdil <dbrazdil@...gle.com>
---
 drivers/firmware/psci/psci.c | 2 +-
 include/linux/psci.h         | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index ffcb88f60e21..b6ad237b1518 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -71,7 +71,7 @@ u32 psci_function_id[PSCI_FN_MAX];
 				(PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
 				PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
 
-static u32 psci_cpu_suspend_feature;
+u32 psci_cpu_suspend_feature;
 static bool psci_system_reset2_supported;
 
 static inline bool psci_has_ext_power_state(void)
diff --git a/include/linux/psci.h b/include/linux/psci.h
index 877d844ee6d9..a5832d91d493 100644
--- a/include/linux/psci.h
+++ b/include/linux/psci.h
@@ -29,6 +29,8 @@ bool psci_has_osi_support(void);
  */
 extern int psci_driver_version;
 
+extern u32 psci_cpu_suspend_feature;
+
 enum psci_function {
 	PSCI_FN_CPU_SUSPEND,
 	PSCI_FN_CPU_ON,
-- 
2.29.1.341.ge80a0c044ae-goog