linux-kernel - [PATCH 6.0 612/862] cpuidle: riscv-sbi: Fix CPU_PM_CPU_IDLE_ENTER

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Date:   Wed, 19 Oct 2022 10:31:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 612/862] cpuidle: riscv-sbi: Fix CPU_PM_CPU_IDLE_ENTER_xyz() macro usage

From: Anup Patel <apatel@...tanamicro.com>

[ Upstream commit cfadbb9df8c4dc917787da4458327e5ec14743d4 ]

Currently, we are using CPU_PM_CPU_IDLE_ENTER_PARAM() for all SBI HSM
suspend types so retentive suspend types are also treated non-retentive
and kernel will do redundant additional work for these states.

The BIT[31] of SBI HSM suspend types allows us to differentiate between
retentive and non-retentive suspend types so we should use this BIT
to call appropriate CPU_PM_CPU_IDLE_ENTER_xyz() macro.

Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Link: https://lore.kernel.org/r/20220718084553.2056169-1-apatel@ventanamicro.com/
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpuidle/cpuidle-riscv-sbi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index 862a2876f1c9..05fe2902df9a 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -97,8 +97,13 @@ static int sbi_cpuidle_enter_state(struct cpuidle_device *dev,
 				   struct cpuidle_driver *drv, int idx)
 {
 	u32 *states = __this_cpu_read(sbi_cpuidle_data.states);
+	u32 state = states[idx];
 
-	return CPU_PM_CPU_IDLE_ENTER_PARAM(sbi_suspend, idx, states[idx]);
+	if (state & SBI_HSM_SUSP_NON_RET_BIT)
+		return CPU_PM_CPU_IDLE_ENTER_PARAM(sbi_suspend, idx, state);
+	else
+		return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(sbi_suspend,
+							     idx, state);
 }
 
 static int __sbi_enter_domain_idle_state(struct cpuidle_device *dev,
-- 
2.35.1