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ACPI: sysfs: Allow bitmap list to be supplied to acpi_mask_gpe

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Currently we need to use as many acpi_mask_gpe options as we want to have
GPEs to be masked. Even with two it already becomes inconveniently large
the kernel command line.

Instead, allow acpi_mask_gpe to represent bitmap list.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2021-06-16 20:03:33 +03:00 committed by Rafael J. Wysocki
parent bdd56d7d89
commit d3121e64ad
2 changed files with 11 additions and 4 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -113,7 +113,7 @@
the GPE dispatcher.
This facility can be used to prevent such uncontrolled
GPE floodings.
Format: <byte>
Format: <byte> or <bitmap-list>
acpi_no_auto_serialize [HW,ACPI]
Disable auto-serialization of AML methods

13
drivers/acpi/sysfs.c
View File

@ -5,6 +5,7 @@
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/bitmap.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
@ -790,6 +791,7 @@ end:
* the GPE flooding for GPE 00, they need to specify the following boot
* parameter:
* acpi_mask_gpe=0x00
* Note, the parameter can be a list (see bitmap_parselist() for the details).
* The masking status can be modified by the following runtime controlling
* interface:
* echo unmask > /sys/firmware/acpi/interrupts/gpe00
@ -799,11 +801,16 @@ static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
static int __init acpi_gpe_set_masked_gpes(char *val)
{
int ret;
u8 gpe;
if (kstrtou8(val, 0, &gpe))
return -EINVAL;
set_bit(gpe, acpi_masked_gpes_map);
ret = kstrtou8(val, 0, &gpe);
if (ret) {
ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
if (ret)
return ret;
} else
set_bit(gpe, acpi_masked_gpes_map);
return 1;
}