[PATCH 2/8] x86/platform/uv: Return UV Hubless System Type

[Mike Travis]

Return the type of UV hubless system for UV specific code that depends
on that.  Use a define to indicate the change in arg type for this
function in uv.h.  Add a function to convert UV system type to bit
pattern needed for is_uv_hubless().

Signed-off-by: Mike Travis <mike.travis@xxxxxxx>
Reviewed-by: Steve Wahl <steve.wahl@xxxxxxx>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@xxxxxxx>
---
 arch/x86/include/asm/uv/uv.h       |   13 +++++++++++--
 arch/x86/kernel/apic/x2apic_uv_x.c |   29 +++++++++++++++++++----------
 2 files changed, 30 insertions(+), 12 deletions(-)

--- linux.orig/arch/x86/include/asm/uv/uv.h
+++ linux/arch/x86/include/asm/uv/uv.h
@@ -12,13 +12,21 @@ struct mm_struct;
 #ifdef CONFIG_X86_UV
 #include <linux/efi.h>
 
+static inline int uv(int uvtype)
+{
+	/* uv(0) is "any" */
+	if (uvtype >= 0 && uvtype <= 30)
+		return 1 << uvtype;
+	return 1;
+}
 extern enum uv_system_type get_uv_system_type(void);
 static inline bool is_early_uv_system(void)
 {
 	return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab);
 }
 extern int is_uv_system(void);
-extern int is_uv_hubless(void);
+extern int _is_uv_hubless(int uvtype);
+#define is_uv_hubless _is_uv_hubless
 extern void uv_cpu_init(void);
 extern void uv_nmi_init(void);
 extern void uv_system_init(void);
@@ -30,7 +38,8 @@ extern const struct cpumask *uv_flush_tl
 static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
 static inline bool is_early_uv_system(void)	{ return 0; }
 static inline int is_uv_system(void)	{ return 0; }
-static inline int is_uv_hubless(void)	{ return 0; }
+static inline int _is_uv_hubless(int uv) { return 0; }
+#define is_uv_hubless _is_uv_hubless
 static inline void uv_cpu_init(void)	{ }
 static inline void uv_system_init(void)	{ }
 static inline const struct cpumask *
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -46,7 +46,7 @@
 DEFINE_PER_CPU(int, x2apic_extra_bits);
 
 static enum uv_system_type	uv_system_type;
-static bool			uv_hubless_system;
+static int			uv_hubless_system;
 static u64			gru_start_paddr, gru_end_paddr;
 static u64			gru_dist_base, gru_first_node_paddr = -1LL, gru_last_node_paddr;
 static u64			gru_dist_lmask, gru_dist_umask;
@@ -288,11 +288,20 @@ static int __init uv_acpi_madt_oem_check
 	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;
-			pr_info("UV: OEM IDs %s/%s, HUBLESS\n",
-				oem_id, oem_table_id);
-		}
+		if (strncmp(oem_id, "NSGI", 4) != 0)
+			return 0;
+
+		/* UV4 Hubless, CH, (0x11:UV4+Any) */
+		if (strncmp(oem_id, "NSGI4", 5) == 0)
+			uv_hubless_system = 0x11;
+
+		/* UV3 Hubless, UV300/MC990X w/o hub (0x9:UV3+Any) */
+		else
+			uv_hubless_system = 0x9;
+
+		pr_info("UV: OEM IDs %s/%s, HUBLESS(0x%x)\n",
+			oem_id, oem_table_id, uv_hubless_system);
+
 		return 0;
 	}
 
@@ -370,11 +379,11 @@ int is_uv_system(void)
 }
 EXPORT_SYMBOL_GPL(is_uv_system);
 
-int is_uv_hubless(void)
+int _is_uv_hubless(int uvtype)
 {
-	return uv_hubless_system;
+	return (uv_hubless_system & uvtype);
 }
-EXPORT_SYMBOL_GPL(is_uv_hubless);
+EXPORT_SYMBOL_GPL(_is_uv_hubless);
 
 void **__uv_hub_info_list;
 EXPORT_SYMBOL_GPL(__uv_hub_info_list);
@@ -1612,7 +1621,7 @@ static void __init uv_system_init_hub(vo
  */
 void __init uv_system_init(void)
 {
-	if (likely(!is_uv_system() && !is_uv_hubless()))
+	if (likely(!is_uv_system() && !is_uv_hubless(1)))
 		return;
 
 	if (is_uv_system())

--