Patch "thermal: intel: int340x: processor: Remove MMIO RAPL CPU hotplug support" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    thermal: intel: int340x: processor: Remove MMIO RAPL CPU hotplug support

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     thermal-intel-int340x-processor-remove-mmio-rapl-cpu.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d50409bdfe855bb59c21b5bfb1d91445dc8113f1
Author: Zhang Rui <rui.zhang@xxxxxxxxx>
Date:   Mon Sep 30 16:18:00 2024 +0800

    thermal: intel: int340x: processor: Remove MMIO RAPL CPU hotplug support
    
    [ Upstream commit bfc6819e4bf56a55df6178f93241b5845ad672eb ]
    
    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 in it.
    
    Always register a RAPL package device for package 0 and remove the
    unnecessary CPU hotplug support.
    
    Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
    Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
    Link: https://patch.msgid.link/20240930081801.28502-6-rui.zhang@xxxxxxxxx
    [ rjw: Subject edits ]
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_rapl.c
index e964a9375722a..f7ab1f47ca7a6 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);