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ACPICA: Dispatcher: Introduce timeout mechanism for infinite loop detection

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ACPICA commit 9605023e7e6d1f05581502766c8cf2905bcc03d9

This patch implements a new infinite loop detection mechanism to replace
the old one, it uses acpi_os_get_timer() to limit loop execution into a
determined time slice.
This is useful in case some hardware/firmware operations really require the
AML interpreter to wait while the old mechanism could expire too fast on
recent machines.

The new mechanism converts old acpi_gbl_max_loop_iterations to store the user
configurable value for the new mechanism in order to allow users to be
still able to configure this value for acpiexec via command line. This
patch also removes wrong initilization code of acpi_gbl_max_loop_iterations
accordingly (it should have been initialized by ACPI_INIT_GLOBAL, and the
default value is also properly tuned for acpiexec). Reported by M. Foronda,
fixed by Lv Zheng.

Link: 9605023e
Link: https://bugzilla.kernel.org/show_bug.cgi?id=156501
Reported-by: M. Foronda <[email protected]>
Signed-off-by: Lv Zheng <[email protected]>
Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Erik Schmauss <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Lv Zheng 2017-11-17 15:40:18 -08:00 • committed by Rafael J. Wysocki
commit 164a08cee1
6 changed files with 16 additions and 13 deletions
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4
include/acpi/acconfig.h
View file

@ -145,9 +145,9 @@
#define ACPI_ADDRESS_RANGE_MAX 2
/* Maximum number of While() loops before abort */
/* Maximum time (default 30s) of While() loops before abort */
#define ACPI_MAX_LOOP_COUNT 0x000FFFFF
#define ACPI_MAX_LOOP_TIMEOUT 30
/******************************************************************************
*

4
include/acpi/acpixf.h
View file

@ -260,11 +260,11 @@ ACPI_INIT_GLOBAL(u8, acpi_gbl_osi_data, 0);
ACPI_INIT_GLOBAL(u8, acpi_gbl_reduced_hardware, FALSE);
/*
* Maximum number of While() loop iterations before forced method abort.
* Maximum timeout for While() loop iterations before forced method abort.
* This mechanism is intended to prevent infinite loops during interpreter
* execution within a host kernel.
*/
ACPI_INIT_GLOBAL(u32, acpi_gbl_max_loop_iterations, ACPI_MAX_LOOP_COUNT);
ACPI_INIT_GLOBAL(u32, acpi_gbl_max_loop_iterations, ACPI_MAX_LOOP_TIMEOUT);
/*
* This mechanism is used to trace a specified AML method. The method is

2
include/acpi/actypes.h
View file

@ -468,6 +468,8 @@ typedef void *acpi_handle; /* Actually a ptr to a NS Node */
#define ACPI_NSEC_PER_MSEC 1000000L
#define ACPI_NSEC_PER_SEC 1000000000L
#define ACPI_TIME_AFTER(a, b) ((s64)((b) - (a)) < 0)
/* Owner IDs are used to track namespace nodes for selective deletion */
typedef u8 acpi_owner_id;