linux-kernel - [PATCH] cpuidle: riscv-sbi: Add cluster_pm

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Message-Id: <20240226065113.1690534-1-nick.hu@sifive.com>
Date: Mon, 26 Feb 2024 14:51:13 +0800
From: Nick Hu <nick.hu@...ive.com>
To: anup@...infault.org,
	rafael@...nel.org,
	daniel.lezcano@...aro.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	linux-pm@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: zong.li@...ive.com,
	Nick Hu <nick.hu@...ive.com>
Subject: [PATCH] cpuidle: riscv-sbi: Add cluster_pm_enter()/exit()

When the cpus in the same cluster are all in the idle state, the kernel
might put the cluster into a deeper low power state. Call the
cluster_pm_enter() before entering the low power state and call the
cluster_pm_exit() after the cluster woken up.

Signed-off-by: Nick Hu <nick.hu@...ive.com>
---
 drivers/cpuidle/cpuidle-riscv-sbi.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index e8094fc92491..298dc76a00cf 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -394,6 +394,7 @@ static int sbi_cpuidle_pd_power_off(struct generic_pm_domain *pd)
 {
 	struct genpd_power_state *state = &pd->states[pd->state_idx];
 	u32 *pd_state;
+	int ret;
 
 	if (!state->data)
 		return 0;
@@ -401,6 +402,10 @@ static int sbi_cpuidle_pd_power_off(struct generic_pm_domain *pd)
 	if (!sbi_cpuidle_pd_allow_domain_state)
 		return -EBUSY;
 
+	ret = cpu_cluster_pm_enter();
+	if (ret)
+		return ret;
+
 	/* OSI mode is enabled, set the corresponding domain state. */
 	pd_state = state->data;
 	sbi_set_domain_state(*pd_state);
@@ -408,6 +413,19 @@ static int sbi_cpuidle_pd_power_off(struct generic_pm_domain *pd)
 	return 0;
 }
 
+static int sbi_cpuidle_pd_power_on(struct generic_pm_domain *pd)
+{
+	struct genpd_power_state *state = &pd->states[pd->state_idx];
+
+	if (!state->data)
+		return 0;
+
+	if (!sbi_cpuidle_pd_allow_domain_state)
+		return -EBUSY;
+
+	return cpu_cluster_pm_exit();
+}
+
 struct sbi_pd_provider {
 	struct list_head link;
 	struct device_node *node;
@@ -433,10 +451,12 @@ static int sbi_pd_init(struct device_node *np)
 	pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
 
 	/* Allow power off when OSI is available. */
-	if (sbi_cpuidle_use_osi)
+	if (sbi_cpuidle_use_osi) {
 		pd->power_off = sbi_cpuidle_pd_power_off;
-	else
+		pd->power_on = sbi_cpuidle_pd_power_on;
+	} else {
 		pd->flags |= GENPD_FLAG_ALWAYS_ON;
+	}
 
 	/* Use governor for CPU PM domains if it has some states to manage. */
 	pd_gov = pd->states ? &pm_domain_cpu_gov : NULL;
-- 
2.34.1