[PATCH 6/8] x86/platform/uv: Decode UVsystab Info

[Mike Travis <mike.travis@hpe.com>]

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Decode the hubless UVsystab passed from BIOS to the kernel saving
pertinent info in a similar manner that hubbed UVsystabs are decoded.

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, 14 insertions(+), 2 deletions(-)

--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1323,7 +1323,8 @@ static int __init decode_uv_systab(void)
 	struct uv_systab *st;
 	int i;
 
-	if (uv_hub_info->hub_revision < UV4_HUB_REVISION_BASE)
+	/* Select only UV4 (hubbed or hubless) and higher */
+	if (is_uv_hubbed(-2) < uv(4) && is_uv_hubless(-2) < uv(4))
 		return 0;	/* No extended UVsystab required */
 
 	st = uv_systab;
@@ -1574,8 +1575,19 @@ static __init int uv_system_init_hubless
 
 	/* Init kernel/BIOS interface */
 	rc = uv_bios_init();
+	if (rc < 0) {
+		pr_err("UV: BIOS init error:%d\n", rc);
+		return rc;
+	}
+
+	/* Process UVsystab */
+	rc = decode_uv_systab();
+	if (rc < 0) {
+		pr_err("UV: UVsystab decode error:%d\n", rc);
+		return rc;
+	}
 
-	/* Create user access node if UVsystab available */
+	/* Create user access node */
 	if (rc >= 0)
 		uv_setup_proc_files(1);
 

--