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Message-Id: <20190910144610.075085694@stormcage.eag.rdlabs.hpecorp.net>
References: <20190910144609.909602978@stormcage.eag.rdlabs.hpecorp.net>
User-Agent: quilt/0.46-1
Date:   Tue, 10 Sep 2019 09:46:10 -0500
From:   Mike Travis <mike.travis@hpe.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>,
        Christoph Hellwig <hch@infradead.org>
Cc:     Dimitri Sivanich <dimitri.sivanich@hpe.com>,
        Russ Anderson <russ.anderson@hpe.com>,
        Hedi Berriche <hedi.berriche@hpe.com>,
        Steve Wahl <steve.wahl@hpe.com>,
        Justin Ernst <justin.ernst@hpe.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 1/8] x86/platform/uv: Save OEM_ID from ACPI MADT probe
Content-Disposition: inline; filename=save-oem_id
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
---
 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;

--