From: Ruihui Dian <dianruihui@xxxxxxx>
AMD ROME's BIOS implement a feature(GHES_ASSIST)which is
declared in ACPI 6.3,and can't be disabled by BIOS setting.
This feature make kerenl register more than 10K poll timer.
There are more than 10K GHESdevices under
"/sys/bus/platform/drivers/GHES". These 10K timers will
preempt the CPU resources and affect kernel's schedule.
How to reproduce:
running cyclictest benchmark on AMD ROME platform
GHES_ASSIST still don't be supported by upsteam, and the
ACPI 6.2 still isn't published, So we should disable it
in drivers.
Signed-off-by: Ruihui Dian <dianruihui@xxxxxxx>
---
drivers/acpi/apei/hest.c | 10 ++++++----
include/acpi/actbl1.h | 3 ++-
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 8224024..f929bab 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -141,8 +141,9 @@ static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void
{
int *count = data;
- if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
- hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
+ if ((hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR &&
+ !(hest_hdr->source_id&ACPI_HEST_GHES_ASSIST_MSK)) ||
+ hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
(*count)++;
return 0;
}
@@ -153,8 +154,9 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
struct ghes_arr *ghes_arr = data;
int rc, i;
- if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
- hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
+ if ((hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
+ hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2) ||
+ hest_hdr->source_id&CPI_HEST_GHES_ASSIST_MSK)
return 0;
if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 4354954..5dbbab4 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -1155,7 +1155,8 @@ struct acpi_hest_aer_common {
#define ACPI_HEST_FIRMWARE_FIRST (1)
#define ACPI_HEST_GLOBAL (1<<1)
#define ACPI_HEST_GHES_ASSIST (1<<2)
-
+/* If type==9 and Source ID bit [15:12] =!0, It is GHES_ASSIT structure*/
+#define ACPI_HEST_GHES_ASSIST_MSK (0xF000)
/*
* Macros to access the bus/segment numbers in Bus field above:
* Bus number is encoded in bits 7:0
--
1.8.3.1
