ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers

The acpi-cpufreq and pcc-cpufreq drivers are loaded through per-CPU
module aliases. This can result in many unnecessary load requests during
boot if another frequency module, such as intel_pstate, is already
active. For instance, on a typical Intel system, one can observe that
udev makes 2x#CPUs attempts to insert acpi_cpufreq and 1x#CPUs attempts
for pcc_cpufreq. All these tries then fail if another frequency module
is already registered.

In the worst case, without the recent fix in commit 0254127ab977e
("module: Don't wait for GOING modules"), these module loads occupied
all udev workers and had their initialization attempts ran sequentially.
Resolving all these loads then on some larger machines took too long,
prevented other hardware from getting its drivers initialized and
resulted in a failed boot. Discussion over these duplicate module
requests ended up with a conclusion that only one load attempt should be
ideally made.

Both acpi-cpufreq and pcc-cpufreq drivers use platform firmware controls
which are defined by ACPI. It is possible to treat these interfaces as
platform devices.

The patch extends the ACPI parsing logic to check the ACPI namespace if
the PPC or PCC interface is present and creates a virtual platform
device for each if it is available. The acpi-cpufreq and pcc-cpufreq
drivers are then updated to map to these devices.

This allows to try loading acpi-cpufreq and pcc-cpufreq only once during
boot and only if a given interface is available in the firmware.

Signed-off-by: Petr Pavlu <[e-mail]>
[ rjw: whitespace and error message log level adjustments, subject edits ]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/acpi_processor.c

···
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/platform_device.h>
 
 #include <acpi/processor.h>
 
···
 	return result;
 }
 
+/* Create a platform device to represent a CPU frequency control mechanism. */
+static void cpufreq_add_device(const char *name)
+{
+	struct platform_device *pdev;
+
+	pdev = platform_device_register_simple(name, PLATFORM_DEVID_NONE, NULL, 0);
+	if (IS_ERR(pdev))
+		pr_info("%s device creation failed: %ld\n", name, PTR_ERR(pdev));
+}
+
+#ifdef CONFIG_X86
+/* Check presence of Processor Clocking Control by searching for \_SB.PCCH. */
+static void __init acpi_pcc_cpufreq_init(void)
+{
+	acpi_status status;
+	acpi_handle handle;
+
+	status = acpi_get_handle(NULL, "\\_SB", &handle);
+	if (ACPI_FAILURE(status))
+		return;
+
+	if (acpi_has_method(handle, "PCCH"))
+		cpufreq_add_device("pcc-cpufreq");
+}
+#else
+static void __init acpi_pcc_cpufreq_init(void) {}
+#endif /* CONFIG_X86 */
+
 /* Initialization */
 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 int __weak acpi_map_cpu(acpi_handle handle,
···
 		dev_dbg(&device->dev, "Failed to get CPU physical ID.\n");
 
 	pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
-	if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
+	if (!cpu0_initialized) {
 		cpu0_initialized = 1;
 		/*
 		 * Handle UP system running SMP kernel, with no CPU
 		 * entry in MADT
 		 */
-		if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
+		if (!acpi_has_cpu_in_madt() && invalid_logical_cpuid(pr->id) &&
+		    (num_online_cpus() == 1))
 			pr->id = 0;
+		/*
+		 * Check availability of Processor Performance Control by
+		 * looking at the presence of the _PCT object under the first
+		 * processor definition.
+		 */
+		if (acpi_has_method(pr->handle, "_PCT"))
+			cpufreq_add_device("acpi-cpufreq");
 	}
 
 	/*
···
 	acpi_processor_check_duplicates();
 	acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
 	acpi_scan_add_handler(&processor_container_handler);
+	acpi_pcc_cpufreq_init();
 }
 
 #ifdef CONFIG_ACPI_PROCESSOR_CSTATE

drivers/cpufreq/acpi-cpufreq.c

···
 	acpi_cpufreq_driver.boost_enabled = boost_state(0);
 }
 
-static int __init acpi_cpufreq_init(void)
+static int __init acpi_cpufreq_probe(struct platform_device *pdev)
 {
 	int ret;
 
···
 	return ret;
 }
 
-static void __exit acpi_cpufreq_exit(void)
+static int acpi_cpufreq_remove(struct platform_device *pdev)
 {
 	pr_debug("%s\n", __func__);
 
 	cpufreq_unregister_driver(&acpi_cpufreq_driver);
 
 	free_acpi_perf_data();
+
+	return 0;
+}
+
+static struct platform_driver acpi_cpufreq_platdrv = {
+	.driver = {
+		.name	= "acpi-cpufreq",
+	},
+	.remove		= acpi_cpufreq_remove,
+};
+
+static int __init acpi_cpufreq_init(void)
+{
+	return platform_driver_probe(&acpi_cpufreq_platdrv, acpi_cpufreq_probe);
+}
+
+static void __exit acpi_cpufreq_exit(void)
+{
+	platform_driver_unregister(&acpi_cpufreq_platdrv);
 }
 
 module_param(acpi_pstate_strict, uint, 0644);
···
 late_initcall(acpi_cpufreq_init);
 module_exit(acpi_cpufreq_exit);
 
-static const struct x86_cpu_id __maybe_unused acpi_cpufreq_ids[] = {
-	X86_MATCH_FEATURE(X86_FEATURE_ACPI, NULL),
-	X86_MATCH_FEATURE(X86_FEATURE_HW_PSTATE, NULL),
-	{}
-};
-MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
-
-static const struct acpi_device_id __maybe_unused processor_device_ids[] = {
-	{ACPI_PROCESSOR_OBJECT_HID, },
-	{ACPI_PROCESSOR_DEVICE_HID, },
-	{},
-};
-MODULE_DEVICE_TABLE(acpi, processor_device_ids);
-
-MODULE_ALIAS("acpi");
+MODULE_ALIAS("platform:acpi-cpufreq");

drivers/cpufreq/pcc-cpufreq.c

···
 	return ret;
 }
 
-static int __init pcc_cpufreq_probe(void)
+static int __init pcc_cpufreq_evaluate(void)
 {
 	acpi_status status;
 	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
···
 	.name = "pcc-cpufreq",
 };
 
-static int __init pcc_cpufreq_init(void)
+static int __init pcc_cpufreq_probe(struct platform_device *pdev)
 {
 	int ret;
 
···
 	if (acpi_disabled)
 		return -ENODEV;
 
-	ret = pcc_cpufreq_probe();
+	ret = pcc_cpufreq_evaluate();
 	if (ret) {
-		pr_debug("pcc_cpufreq_init: PCCH evaluation failed\n");
+		pr_debug("pcc_cpufreq_probe: PCCH evaluation failed\n");
 		return ret;
 	}
 
···
 	return ret;
 }
 
-static void __exit pcc_cpufreq_exit(void)
+static int pcc_cpufreq_remove(struct platform_device *pdev)
 {
 	cpufreq_unregister_driver(&pcc_cpufreq_driver);
 
 	pcc_clear_mapping();
 
 	free_percpu(pcc_cpu_info);
+
+	return 0;
 }
 
-static const struct acpi_device_id __maybe_unused processor_device_ids[] = {
-	{ACPI_PROCESSOR_OBJECT_HID, },
-	{ACPI_PROCESSOR_DEVICE_HID, },
-	{},
+static struct platform_driver pcc_cpufreq_platdrv = {
+	.driver = {
+		.name	= "pcc-cpufreq",
+	},
+	.remove		= pcc_cpufreq_remove,
 };
-MODULE_DEVICE_TABLE(acpi, processor_device_ids);
+
+static int __init pcc_cpufreq_init(void)
+{
+	return platform_driver_probe(&pcc_cpufreq_platdrv, pcc_cpufreq_probe);
+}
+
+static void __exit pcc_cpufreq_exit(void)
+{
+	platform_driver_unregister(&pcc_cpufreq_platdrv);
+}
+
+MODULE_ALIAS("platform:pcc-cpufreq");
 
 MODULE_AUTHOR("Matthew Garrett, Naga Chumbalkar");
 MODULE_VERSION(PCC_VERSION);