Merge tag 'acpi-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These modify the ACPI device events and processor enumeration code to
  take the 'enabled' _STA bit into account as mandated by the ACPI
  specification, convert several platform drivers to using a remove
  callback that returns void, add some new quirks for ACPI IRQ override
  and other things, address assorted issues and clean up code.

  Specifics:

   - Rearrange Device Check and Bus Check notification handling in the
     ACPI device hotplug code to make it get the "enabled" _STA bit into
     account (Rafael Wysocki)

   - Modify acpi_processor_add() to skip processors with the "enabled"
     _STA bit clear, as per the specification (Rafael Wysocki)

   - Stop failing Device Check notification handling without a valid
     reason (Rafael Wysocki)

   - Defer enumeration of devices that depend on a device with an ACPI
     device ID equalt to INTC10CF to address probe ordering issues on
     some platforms (Wentong Wu)

   - Constify acpi_bus_type (Ricardo Marliere)

   - Make the ACPI-specific suspend-to-idle code take the Low-Power S0
     Idle MSFT UUID into account on non-AMD systems (Rafael Wysocki)

   - Add ACPI IRQ override quirks for some new platforms (Sergey
     Kalinichev, Maxim Kudinov, Alexey Froloff, Sviatoslav Harasymchuk,
     Nicolas Haye)

   - Make the NFIT parsing code use acpi_evaluate_dsm_typed() (Andy
     Shevchenko)

   - Fix a memory leak in acpi_processor_power_exit() (Armin Wolf)

   - Make it possible to quirk the CSI-2 and MIPI DisCo for Imaging
     properties parsing and add a quirk for Dell XPS 9315 (Sakari Ailus)

   - Prevent false-positive static checker warnings from triggering by
     intializing some variables in the ACPI thermal code to zero (Colin
     Ian King)

   - Add DELL0501 handling to acpi_quirk_skip_serdev_enumeration() and
     make that function generic (Hans de Goede)

   - Make the ACPI backlight code handle fetching EDID that is longer
     than 256 bytes (Mario Limonciello)

   - Skip initialization of GHES_ASSIST structures for Machine Check
     Architecture in APEI (Avadhut Naik)

   - Convert several plaform drivers in the ACPI subsystem to using a
     remove callback that returns void (Uwe Kleine-König)

   - Drop the long-deprecated custom_method debugfs interface that is
     problematic from the security standpoint (Rafael Wysocki)

   - Use %pe in a couple of places in the ACPI code for easier error
     decoding (Onkarnath)

   - Fix register width information handling during system memory
     accesses in the ACPI CPPC library (Jarred White)

   - Add AMD CPPC V2 support for family 17h processors to the ACPI CPPC
     library (Perry Yuan)"

* tag 'acpi-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (35 commits)
  ACPI: resource: Use IRQ override on Maibenben X565
  ACPI: CPPC: Use access_width over bit_width for system memory accesses
  ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors
  ACPI: APEI: Skip initialization of GHES_ASSIST structures for Machine Check Architecture
  ACPI: scan: Consolidate Device Check and Bus Check notification handling
  ACPI: scan: Rework Device Check and Bus Check notification handling
  ACPI: scan: Make acpi_processor_add() check the device enabled bit
  ACPI: scan: Relocate acpi_bus_trim_one()
  ACPI: scan: Fix device check notification handling
  ACPI: resource: Add MAIBENBEN X577 to irq1_edge_low_force_override
  ACPI: pfr_update: Convert to platform remove callback returning void
  ACPI: pfr_telemetry: Convert to platform remove callback returning void
  ACPI: fan: Convert to platform remove callback returning void
  ACPI: GED: Convert to platform remove callback returning void
  ACPI: DPTF: Convert to platform remove callback returning void
  ACPI: AGDI: Convert to platform remove callback returning void
  ACPI: TAD: Convert to platform remove callback returning void
  ACPI: APEI: GHES: Convert to platform remove callback returning void
  ACPI: property: Polish ignoring bad data nodes
  ACPI: thermal_lib: Initialize temp_decik to zero
  ...

Author: torvalds

Documentation/firmware-guide/acpi/index.rst

@@ -14,7 +14,6 @@ ACPI Support
    dsd/phy
    enumeration
    osi
-   method-customizing
    method-tracing
    DSD-properties-rules
    debug

Documentation/firmware-guide/acpi/method-customizing.rst

@@ -20,7 +20,7 @@ bool cpc_supported_by_cpu(void)
 		    (boot_cpu_data.x86_model >= 0x20 && boot_cpu_data.x86_model <= 0x2f)))
 			return true;
 		else if (boot_cpu_data.x86 == 0x17 &&
-			 boot_cpu_data.x86_model >= 0x70 && boot_cpu_data.x86_model <= 0x7f)
+			 boot_cpu_data.x86_model >= 0x30 && boot_cpu_data.x86_model <= 0x7f)
 			return true;
 		return boot_cpu_has(X86_FEATURE_CPPC);
 	}

arch/x86/kernel/acpi/cppc.c

@@ -449,20 +449,6 @@ config ACPI_HED
 	  which is used to report some hardware errors notified via
 	  SCI, mainly the corrected errors.
 
-config ACPI_CUSTOM_METHOD
-	tristate "Allow ACPI methods to be inserted/replaced at run time"
-	depends on DEBUG_FS
-	help
-	  This debug facility allows ACPI AML methods to be inserted and/or
-	  replaced without rebooting the system. For details refer to:
-	  Documentation/firmware-guide/acpi/method-customizing.rst.
-
-	  NOTE: This option is security sensitive, because it allows arbitrary
-	  kernel memory to be written to by root (uid=0) users, allowing them
-	  to bypass certain security measures (e.g. if root is not allowed to
-	  load additional kernel modules after boot, this feature may be used
-	  to override that restriction).
-
 config ACPI_BGRT
 	bool "Boottime Graphics Resource Table support"
 	depends on EFI && (X86 || ARM64)

drivers/acpi/Kconfig

@@ -101,7 +101,6 @@ obj-$(CONFIG_ACPI_SBS)		+= sbshc.o
 obj-$(CONFIG_ACPI_SBS)		+= sbs.o
 obj-$(CONFIG_ACPI_HED)		+= hed.o
 obj-$(CONFIG_ACPI_EC_DEBUGFS)	+= ec_sys.o
-obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
 obj-$(CONFIG_ACPI_BGRT)		+= bgrt.o
 obj-$(CONFIG_ACPI_CPPC_LIB)	+= cppc_acpi.o
 obj-$(CONFIG_ACPI_SPCR_TABLE)	+= spcr.o

drivers/acpi/Makefile

@@ -161,7 +161,7 @@ static void cpufreq_add_device(const char *name)
 
 	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));
+		pr_info("%s device creation failed: %pe\n", name, pdev);
 }
 
 #ifdef CONFIG_X86
@@ -381,6 +381,9 @@ static int acpi_processor_add(struct acpi_device *device,
 	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;

drivers/acpi/acpi_processor.c

@@ -554,7 +554,7 @@ static int acpi_tad_disable_timer(struct device *dev, u32 timer_id)
 	return acpi_tad_wake_set(dev, "_STV", timer_id, ACPI_TAD_WAKE_DISABLED);
 }
 
-static int acpi_tad_remove(struct platform_device *pdev)
+static void acpi_tad_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	acpi_handle handle = ACPI_HANDLE(dev);
@@ -579,7 +579,6 @@ static int acpi_tad_remove(struct platform_device *pdev)
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 	acpi_remove_cmos_rtc_space_handler(handle);
-	return 0;
 }
 
 static int acpi_tad_probe(struct platform_device *pdev)
@@ -684,7 +683,7 @@ static struct platform_driver acpi_tad_driver = {
 		.acpi_match_table = acpi_tad_ids,
 	},
 	.probe = acpi_tad_probe,
-	.remove = acpi_tad_remove,
+	.remove_new = acpi_tad_remove,
 };
 MODULE_DEVICE_TABLE(acpi, acpi_tad_ids);
 

drivers/acpi/acpi_tad.c

@@ -612,7 +612,7 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 
 static int
 acpi_video_device_EDID(struct acpi_video_device *device,
-		       union acpi_object **edid, ssize_t length)
+		       union acpi_object **edid, int length)
 {
 	int status;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -625,13 +625,11 @@ acpi_video_device_EDID(struct acpi_video_device *device,
 
 	if (!device)
 		return -ENODEV;
-	if (length == 128)
-		arg0.integer.value = 1;
-	else if (length == 256)
-		arg0.integer.value = 2;
-	else
+	if (!length || (length % 128))
 		return -EINVAL;
 
+	arg0.integer.value = length / 128;
+
 	status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
@@ -641,7 +639,8 @@ acpi_video_device_EDID(struct acpi_video_device *device,
 	if (obj && obj->type == ACPI_TYPE_BUFFER)
 		*edid = obj;
 	else {
-		acpi_handle_info(device->dev->handle, "Invalid _DDC data\n");
+		acpi_handle_debug(device->dev->handle,
+				 "Invalid _DDC data for length %d\n", length);
 		status = -EFAULT;
 		kfree(obj);
 	}
@@ -1447,7 +1446,6 @@ int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
 
 	for (i = 0; i < video->attached_count; i++) {
 		video_device = video->attached_array[i].bind_info;
-		length = 256;
 
 		if (!video_device)
 			continue;
@@ -1478,18 +1476,14 @@ int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
 			continue;
 		}
 
-		status = acpi_video_device_EDID(video_device, &buffer, length);
-
-		if (ACPI_FAILURE(status) || !buffer ||
-		    buffer->type != ACPI_TYPE_BUFFER) {
-			length = 128;
+		for (length = 512; length > 0; length -= 128) {
 			status = acpi_video_device_EDID(video_device, &buffer,
 							length);
-			if (ACPI_FAILURE(status) || !buffer ||
-			    buffer->type != ACPI_TYPE_BUFFER) {
-				continue;
-			}
+			if (ACPI_SUCCESS(status))
+				break;
 		}
+		if (!length)
+			continue;
 
 		*edid = buffer->buffer.pointer;
 		return length;

drivers/acpi/acpi_video.c

@@ -179,7 +179,7 @@ void __init acpi_watchdog_init(void)
 	pdev = platform_device_register_simple("wdat_wdt", PLATFORM_DEVID_NONE,
 					       resources, nresources);
 	if (IS_ERR(pdev))
-		pr_err("Device creation failed: %ld\n", PTR_ERR(pdev));
+		pr_err("Device creation failed: %pe\n", pdev);
 
 	kfree(resources);
 

drivers/acpi/acpi_watchdog.c

@@ -1455,7 +1455,7 @@ static int ghes_probe(struct platform_device *ghes_dev)
 	return rc;
 }
 
-static int ghes_remove(struct platform_device *ghes_dev)
+static void ghes_remove(struct platform_device *ghes_dev)
 {
 	int rc;
 	struct ghes *ghes;
@@ -1492,8 +1492,15 @@ static int ghes_remove(struct platform_device *ghes_dev)
 		break;
 	case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
 		rc = apei_sdei_unregister_ghes(ghes);
-		if (rc)
-			return rc;
+		if (rc) {
+			/*
+			 * Returning early results in a resource leak, but we're
+			 * only here if stopping the hardware failed.
+			 */
+			dev_err(&ghes_dev->dev, "Failed to unregister ghes (%pe)\n",
+				ERR_PTR(rc));
+			return;
+		}
 		break;
 	default:
 		BUG();
@@ -1507,16 +1514,14 @@ static int ghes_remove(struct platform_device *ghes_dev)
 	mutex_unlock(&ghes_devs_mutex);
 
 	kfree(ghes);
-
-	return 0;
 }
 
 static struct platform_driver ghes_platform_driver = {
 	.driver		= {
 		.name	= "GHES",
 	},
 	.probe		= ghes_probe,
-	.remove		= ghes_remove,
+	.remove_new	= ghes_remove,
 };
 
 void __init acpi_ghes_init(void)