linux-kernel - [PATCH v2 3/5] ACPI: scan: Make acpi_processor

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Date: Mon, 26 Feb 2024 17:40:52 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux ACPI <linux-acpi@...r.kernel.org>,
 Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 "Russell King (Oracle)" <linux@...linux.org.uk>
Subject:
 [PATCH v2 3/5] ACPI: scan: Make acpi_processor_add() check the device enabled
 bit

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Modify acpi_processor_add() return an error if _STA returns the enabled
bit clear for the given processor device, so as to avoid using processors
that don't decode their resources, as per the ACPI specification. [1]

Link: https://uefi.org/specs/ACPI/6.5/06_Device_Configuration.html#sta-device-status # [1]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

v1 -> v2:
   * Move acpi_device_is_enabled() to this patch.
   * Change patch ordering.
   * Do not check the "functional" _STA bit in acpi_device_is_present().

---
 drivers/acpi/acpi_processor.c |    3 +++
 drivers/acpi/internal.h       |    1 +
 drivers/acpi/scan.c           |    5 +++++
 3 files changed, 9 insertions(+)

Index: linux-pm/drivers/acpi/internal.h
===================================================================
--- linux-pm.orig/drivers/acpi/internal.h
+++ linux-pm/drivers/acpi/internal.h
@@ -121,6 +121,7 @@ int acpi_device_setup_files(struct acpi_
 void acpi_device_remove_files(struct acpi_device *dev);
 void acpi_device_add_finalize(struct acpi_device *device);
 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
+bool acpi_device_is_enabled(const struct acpi_device *adev);
 bool acpi_device_is_present(const struct acpi_device *adev);
 bool acpi_device_is_battery(struct acpi_device *adev);
 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
Index: linux-pm/drivers/acpi/acpi_processor.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpi_processor.c
+++ linux-pm/drivers/acpi/acpi_processor.c
@@ -381,6 +381,9 @@ static int acpi_processor_add(struct acp
 	struct device *dev;
 	int result = 0;

+	if (!acpi_device_is_enabled(device))
+		return -ENODEV;
+
 	pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 	if (!pr)
 		return -ENOMEM;
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1945,6 +1945,11 @@ bool acpi_device_is_present(const struct
 	return adev->status.present || adev->status.functional;
 }

+bool acpi_device_is_enabled(const struct acpi_device *adev)
+{
+	return adev->status.present && adev->status.enabled;
+}
+
 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
 				       const char *idstr,
 				       const struct acpi_device_id **matchid)