[PATCH 4/8] x86/platform/uv: Setup UV functions for Hubless UV Systems

From: Mike Travis
Date: Mon Sep 02 2019 - 20:18:55 EST


Add more support for UV systems that do not contain a UV Hub (AKA
"hubless"). This update adds support for additional functions required:

Use PCH NMI handler instead of a UV Hub NMI handler.

Initialize the UV BIOS callback interface used to support specific
UV functions.

Signed-off-by: Mike Travis <mike.travis@xxxxxxx>
Reviewed-by: Steve Wahl <steve.wahl@xxxxxxx>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@xxxxxxx>
---
arch/x86/kernel/apic/x2apic_uv_x.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)

--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1477,6 +1477,20 @@ static void __init build_socket_tables(v
}
}

+/* Initialize UV hubless systems */
+static __init int uv_system_init_hubless(void)
+{
+ int rc;
+
+ /* Setup PCH NMI handler */
+ uv_nmi_setup_hubless();
+
+ /* Init kernel/BIOS interface */
+ rc = uv_bios_init();
+
+ return rc;
+}
+
static void __init uv_system_init_hub(void)
{
struct uv_hub_info_s hub_info = {0};
@@ -1616,8 +1630,8 @@ static void __init uv_system_init_hub(vo
}

/*
- * There is a small amount of UV specific code needed to initialize a
- * UV system that does not have a "UV HUB" (referred to as "hubless").
+ * There is a different code path needed to initialize a UV system that does
+ * not have a "UV HUB" (referred to as "hubless").
*/
void __init uv_system_init(void)
{
@@ -1627,7 +1641,7 @@ void __init uv_system_init(void)
if (is_uv_system())
uv_system_init_hub();
else
- uv_nmi_setup_hubless();
+ uv_system_init_hubless();
}

apic_driver(apic_x2apic_uv_x);

--