[PATCH v3 09/13] cpuidle: psci: Attach CPU devices to their PM domains

From: Ulf Hansson <ulf.hansson@linaro.org>
To: Sudeep Holla <sudeep.holla@arm.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-pm@vger.kernel.org
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Lina Iyer <ilina@codeaurora.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Stephen Boyd <sboyd@kernel.org>, Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Kevin Hilman <khilman@kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm@vger.kernel.org
Subject: [PATCH v3 09/13] cpuidle: psci: Attach CPU devices to their PM domains
Date: Wed, 27 Nov 2019 11:29:10 +0100	[thread overview]
Message-ID: <20191127102914.18729-10-ulf.hansson@linaro.org> (raw)
In-Reply-To: <20191127102914.18729-1-ulf.hansson@linaro.org>

In order to enable a CPU to be power managed through its PM domain, let's
try to attach it by calling psci_dt_attach_cpu() during the cpuidle
initialization.

psci_dt_attach_cpu() returns a pointer to the attached struct device, which
later should be used for runtime PM, hence we need to store it somewhere.
Rather than adding yet another per CPU variable, let's create a per CPU
struct to collect the relevant per CPU variables.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

Changes in v3:
	- None.

---
 drivers/cpuidle/cpuidle-psci.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index 830995b8a56f..167249d0493f 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -20,14 +20,20 @@
 
 #include <asm/cpuidle.h>
 
+#include "cpuidle-psci.h"
 #include "dt_idle_states.h"
 
-static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
+struct psci_cpuidle_data {
+	u32 *psci_states;
+	struct device *dev;
+};
+
+static DEFINE_PER_CPU_READ_MOSTLY(struct psci_cpuidle_data, psci_cpuidle_data);
 
 static int psci_enter_idle_state(struct cpuidle_device *dev,
 				struct cpuidle_driver *drv, int idx)
 {
-	u32 *state = __this_cpu_read(psci_power_state);
+	u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states);
 
 	return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
 					   idx, state[idx]);
@@ -78,7 +84,9 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
 {
 	int i, ret = 0;
 	u32 *psci_states;
+	struct device *dev;
 	struct device_node *state_node;
+	struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu);
 
 	state_count++; /* Add WFI state too */
 	psci_states = kcalloc(state_count, sizeof(*psci_states), GFP_KERNEL);
@@ -104,8 +112,16 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
 		goto free_mem;
 	}
 
-	/* Idle states parsed correctly, initialize per-cpu pointer */
-	per_cpu(psci_power_state, cpu) = psci_states;
+	dev = psci_dt_attach_cpu(cpu);
+	if (IS_ERR(dev)) {
+		ret = PTR_ERR(dev);
+		goto free_mem;
+	}
+
+	data->dev = dev;
+
+	/* Idle states parsed correctly, store them in the per-cpu struct. */
+	data->psci_states = psci_states;
 	return 0;
 
 free_mem:
-- 
2.17.1

