[PATCH 1/8] x86/platform/uv: Save OEM_ID from ACPI MADT probe

Mike Travis
2019-09-05T13:03:39Z

[-- Attachment #1: save-oem_id --]
[-- Type: text/plain, Size: 2256 bytes --]

Save the OEM_ID and OEM_TABLE_ID passed to the apic driver probe function
for later use. Also, convert the char list arg passed from the kernel
to a true null-terminated string.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
To: Thomas Gleixner <tglx@linutronix.de>
To: Ingo Molnar <mingo@redhat.com>
To: H. Peter Anvin <hpa@zytor.com>
To: Andrew Morton <akpm@linux-foundation.org>
To: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: Hedi Berriche <hedi.berriche@hpe.com>
Cc: Steve Wahl <steve.wahl@hpe.com>
Cc: x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
---
arch/x86/kernel/apic/x2apic_uv_x.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -14,6 +14,7 @@
#include <linux/memory.h>
#include <linux/export.h>
#include <linux/pci.h>
+#include <linux/acpi.h>

#include <asm/e820/api.h>
#include <asm/uv/uv_mmrs.h>
@@ -31,6 +32,10 @@ static u64 gru_dist_base, gru_first_no
static u64 gru_dist_lmask, gru_dist_umask;
static union uvh_apicid uvh_apicid;

+/* Unpack OEM/TABLE ID's to be NULL terminated strings */
+static u8 oem_id[ACPI_OEM_ID_SIZE + 1];
+static u8 oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
+
/* Information derived from CPUID: */
static struct {
unsigned int apicid_shift;
@@ -248,11 +253,20 @@ static void __init uv_set_apicid_hibit(v
}
}

-static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+static void __init uv_stringify(int len, char *to, char *from)
+{
+ /* Relies on 'to' being NULL chars so result will be NULL terminated */
+ strncpy(to, from, len-1);
+}
+
+static int __init uv_acpi_madt_oem_check(char *_oem_id, char *_oem_table_id)
{
int pnodeid;
int uv_apic;

+ uv_stringify(sizeof(oem_id), oem_id, _oem_id);
+ uv_stringify(sizeof(oem_table_id), oem_table_id, _oem_table_id);
+
if (strncmp(oem_id, "SGI", 3) != 0) {
if (strncmp(oem_id, "NSGI", 4) == 0) {
uv_hubless_system = true;

--