linux-kernel - [PATCH 5/6] thermal: proc_thermal: Remove MMIO RAPL cpu hotplug support

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Message-Id: <20240930081801.28502-6-rui.zhang@intel.com>
Date: Mon, 30 Sep 2024 16:18:00 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: rafael.j.wysocki@...el.com
Cc: linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	srinivas.pandruvada@...el.com
Subject: [PATCH 5/6] thermal: proc_thermal: Remove MMIO RAPL cpu hotplug support

CPU0/package0 is always online and the MMIO RAPL driver runs on single
package systems only, so there is no need to handle CPU hotplug.

Always register a RAPL package device for package 0 and remove the
unnecessary cpu hotplug support.

Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../int340x_thermal/processor_thermal_rapl.c  | 66 +++++++------------
 1 file changed, 22 insertions(+), 44 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
index e9aa9e23aab9..769510e748c0 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
@@ -19,42 +19,6 @@ static const struct rapl_mmio_regs rapl_mmio_default = {
 	.limits[RAPL_DOMAIN_DRAM] = BIT(POWER_LIMIT2),
 };
 
-static int rapl_mmio_cpu_online(unsigned int cpu)
-{
-	struct rapl_package *rp;
-
-	/* mmio rapl supports package 0 only for now */
-	if (topology_physical_package_id(cpu))
-		return 0;
-
-	rp = rapl_find_package_domain_cpuslocked(cpu, &rapl_mmio_priv, true);
-	if (!rp) {
-		rp = rapl_add_package_cpuslocked(cpu, &rapl_mmio_priv, true);
-		if (IS_ERR(rp))
-			return PTR_ERR(rp);
-	}
-	cpumask_set_cpu(cpu, &rp->cpumask);
-	return 0;
-}
-
-static int rapl_mmio_cpu_down_prep(unsigned int cpu)
-{
-	struct rapl_package *rp;
-	int lead_cpu;
-
-	rp = rapl_find_package_domain_cpuslocked(cpu, &rapl_mmio_priv, true);
-	if (!rp)
-		return 0;
-
-	cpumask_clear_cpu(cpu, &rp->cpumask);
-	lead_cpu = cpumask_first(&rp->cpumask);
-	if (lead_cpu >= nr_cpu_ids)
-		rapl_remove_package_cpuslocked(rp);
-	else if (rp->lead_cpu == cpu)
-		rp->lead_cpu = lead_cpu;
-	return 0;
-}
-
 static int rapl_mmio_read_raw(int cpu, struct reg_action *ra)
 {
 	if (!ra->reg.mmio)
@@ -82,6 +46,7 @@ static int rapl_mmio_write_raw(int cpu, struct reg_action *ra)
 int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv)
 {
 	const struct rapl_mmio_regs *rapl_regs = &rapl_mmio_default;
+	struct rapl_package *rp;
 	enum rapl_domain_reg_id reg;
 	enum rapl_domain_type domain;
 	int ret;
@@ -109,25 +74,38 @@ int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc
 		return PTR_ERR(rapl_mmio_priv.control_type);
 	}
 
-	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online",
-				rapl_mmio_cpu_online, rapl_mmio_cpu_down_prep);
-	if (ret < 0) {
-		powercap_unregister_control_type(rapl_mmio_priv.control_type);
-		rapl_mmio_priv.control_type = NULL;
-		return ret;
+	/* Register a RAPL package device for package 0 which is always online */
+	rp = rapl_find_package_domain(0, &rapl_mmio_priv, false);
+	if (rp) {
+		ret = -EEXIST;
+		goto err;
+	}
+
+	rp = rapl_add_package(0, &rapl_mmio_priv, false);
+	if (IS_ERR(rp)) {
+		ret = PTR_ERR(rp);
+		goto err;
 	}
-	rapl_mmio_priv.pcap_rapl_online = ret;
 
 	return 0;
+
+err:
+	powercap_unregister_control_type(rapl_mmio_priv.control_type);
+	rapl_mmio_priv.control_type = NULL;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(proc_thermal_rapl_add);
 
 void proc_thermal_rapl_remove(void)
 {
+	struct rapl_package *rp;
+
 	if (IS_ERR_OR_NULL(rapl_mmio_priv.control_type))
 		return;
 
-	cpuhp_remove_state(rapl_mmio_priv.pcap_rapl_online);
+	rp = rapl_find_package_domain(0, &rapl_mmio_priv, false);
+	if (rp)
+		rapl_remove_package(rp);
 	powercap_unregister_control_type(rapl_mmio_priv.control_type);
 }
 EXPORT_SYMBOL_GPL(proc_thermal_rapl_remove);
-- 
2.34.1