[PATCH v1 2/7] ACPI: sysfs: Allow bitmap list to be supplied to acpi_mask_gpe

Andy Shevchenko
2021-06-16T17:04:07Z

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>
---
Documentation/admin-guide/kernel-parameters.txt | 2 +-
drivers/acpi/sysfs.c | 13 ++++++++++---
2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a06a8bfb02a4..c00792362d28 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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
diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 767aa65e4bdd..44e50c36e70a 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -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>
@@ -794,6 +795,7 @@ static ssize_t counter_set(struct kobject *kobj,
* 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
@@ -803,11 +805,16 @@ 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;
}
--
2.30.2