From 103895dd0c1106595c46e8cd61f5edea349e6f4c Mon Sep 17 00:00:00 2001 From: Cristian Ciocaltea Date: Fri, 4 Mar 2022 21:20:39 +0000 Subject: [PATCH 01/21] ACPICA: Limit error message flood caused by firmware bug The following error messages are generated because of an infinite recursion in the latest production BIOS: ACPI Error: Method reached maximum reentrancy limit (255) (20210331/dsmethod-309) ACPI Error: Aborting method \_SB.PCI0.LPC0.EC0.VFCD.PDVL due to previous error (AE_AML_METHOD_LIMIT) (20210331/psparse-529) [...] ACPI Error: Aborting method \_SB.PCI0.LPC0.EC0.VFCD.PDVL due to previous error (AE_AML_METHOD_LIMIT) (20210331/psparse-529) Let's detect this and limit the amount of errors generated. Additionally, add a kernel parameter 'acpi_no_msg_flood_detect' to disable the detection for debugging purposes. https://gitlab.steamos.cloud/jupiter/linux-integration/-/issues/11 Signed-off-by: Cristian Ciocaltea --- drivers/acpi/acpica/dsmethod.c | 5 ++-- drivers/acpi/acpica/uterror.c | 53 ++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c index e809c2aed78a..66267b1a3170 100644 --- a/drivers/acpi/acpica/dsmethod.c +++ b/drivers/acpi/acpica/dsmethod.c @@ -306,8 +306,9 @@ acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, /* Prevent wraparound of thread count */ if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { - ACPI_ERROR((AE_INFO, - "Method reached maximum reentrancy limit (255)")); + /* Suppressing this due to firmware bug flooding the logs */ + /*ACPI_ERROR((AE_INFO, + "Method reached maximum reentrancy limit (255)"));*/ return_ACPI_STATUS(AE_AML_METHOD_LIMIT); } diff --git a/drivers/acpi/acpica/uterror.c b/drivers/acpi/acpica/uterror.c index 918aca7c4db4..4a482de2e55d 100644 --- a/drivers/acpi/acpica/uterror.c +++ b/drivers/acpi/acpica/uterror.c @@ -278,6 +278,56 @@ acpi_ut_namespace_error(const char *module_name, } #endif +/******************************************************************************* + * + * Limit the error message flood caused by a firmware bug: + * + * ACPI Error: Method reached maximum reentrancy limit (255) (20210331/dsmethod-309) + * ACPI Error: Aborting method \_SB.PCI0.LPC0.EC0.VFCD.PDVL due to previous error (AE_AML_METHOD_LIMIT) (20210331/psparse-529) + * [...] + * ACPI Error: Aborting method \_SB.PCI0.LPC0.EC0.VFCD.PDVL due to previous error (AE_AML_METHOD_LIMIT) (20210331/psparse-529) + * + ******************************************************************************/ + +static bool acpi_disable_msg_flood_detect; + +static int __init acpi_no_msg_flood_detect_setup(char *s) +{ + acpi_disable_msg_flood_detect = true; + pr_info("ACPI error message flood detection disabled\n"); + + return 0; +} + +early_param("acpi_no_msg_flood_detect", acpi_no_msg_flood_detect_setup); + +static bool acpi_skip_print_node(struct acpi_namespace_node *node) +{ + static bool skip_print = false; + struct acpi_buffer buffer; + acpi_status status; + + if (acpi_disable_msg_flood_detect || !node) + return false; + + if (!skip_print) { + /* Convert handle to full pathname */ + buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; + + status = acpi_ns_handle_to_pathname(node, &buffer, TRUE); + if (ACPI_SUCCESS(status)) { + skip_print = !strcmp((const char *)buffer.pointer, + "\\_SB.PCI0.LPC0.EC0.VFCD.PDVL"); + ACPI_FREE(buffer.pointer); + + if (skip_print) + return false; /* print once */ + } + } + + return skip_print; +} + /******************************************************************************* * * FUNCTION: acpi_ut_method_error @@ -305,6 +355,9 @@ acpi_ut_method_error(const char *module_name, acpi_status status; struct acpi_namespace_node *node = prefix_node; + if (acpi_skip_print_node(node)) + return; + ACPI_MSG_REDIRECT_BEGIN; acpi_os_printf(ACPI_MSG_ERROR); -- 2.44.0