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Subject[PATCH 02/12] x86/platform/uv: Remove SCIR MMR references for UVY systems.
UV class systems no longer use System Controller for monitoring of CPU
activity provided by this driver. Other methods have been developed
for BIOS and the management controller (BMC). This patch removes that
supporting code.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
---
arch/x86/include/asm/uv/uv_hub.h | 46 ++------------------
arch/x86/kernel/apic/x2apic_uv_x.c | 85 -------------------------------------
2 files changed, 7 insertions(+), 124 deletions(-)

--- linux.orig/arch/x86/include/asm/uv/uv_hub.h
+++ linux/arch/x86/include/asm/uv/uv_hub.h
@@ -5,7 +5,8 @@
*
* SGI UV architectural definitions
*
- * Copyright (C) 2007-2014 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2018-2020 Hewlett Packard Enterprise Development LP
+ * Copyright (C) 2007-2017 Silicon Graphics, Inc. All rights reserved.
*/

#ifndef _ASM_X86_UV_UV_HUB_H
@@ -129,17 +130,6 @@
*/
#define UV_MAX_NASID_VALUE (UV_MAX_NUMALINK_BLADES * 2)

-/* System Controller Interface Reg info */
-struct uv_scir_s {
- struct timer_list timer;
- unsigned long offset;
- unsigned long last;
- unsigned long idle_on;
- unsigned long idle_off;
- unsigned char state;
- unsigned char enabled;
-};
-
/* GAM (globally addressed memory) range table */
struct uv_gam_range_s {
u32 limit; /* PA bits 56:26 (GAM_RANGE_SHFT) */
@@ -191,16 +181,13 @@ struct uv_hub_info_s {
struct uv_cpu_info_s {
void *p_uv_hub_info;
unsigned char blade_cpu_id;
- struct uv_scir_s scir;
+ void *reserved;
};
DECLARE_PER_CPU(struct uv_cpu_info_s, __uv_cpu_info);

#define uv_cpu_info this_cpu_ptr(&__uv_cpu_info)
#define uv_cpu_info_per(cpu) (&per_cpu(__uv_cpu_info, cpu))

-#define uv_scir_info (&uv_cpu_info->scir)
-#define uv_cpu_scir_info(cpu) (&uv_cpu_info_per(cpu)->scir)
-
/* Node specific hub common info struct */
extern void **__uv_hub_info_list;
static inline struct uv_hub_info_s *uv_hub_info_list(int node)
@@ -297,9 +284,9 @@ union uvh_apicid {
#define UV3_GLOBAL_MMR32_SIZE (32UL * 1024 * 1024)

#define UV4_LOCAL_MMR_BASE 0xfa000000UL
-#define UV4_GLOBAL_MMR32_BASE 0xfc000000UL
+#define UV4_GLOBAL_MMR32_BASE 0
#define UV4_LOCAL_MMR_SIZE (32UL * 1024 * 1024)
-#define UV4_GLOBAL_MMR32_SIZE (16UL * 1024 * 1024)
+#define UV4_GLOBAL_MMR32_SIZE 0

#define UV_LOCAL_MMR_BASE ( \
is_uv2_hub() ? UV2_LOCAL_MMR_BASE : \
@@ -772,29 +759,6 @@ DECLARE_PER_CPU(struct uv_cpu_nmi_s, uv_
#define UV_NMI_STATE_DUMP 2
#define UV_NMI_STATE_DUMP_DONE 3

-/* Update SCIR state */
-static inline void uv_set_scir_bits(unsigned char value)
-{
- if (uv_scir_info->state != value) {
- uv_scir_info->state = value;
- uv_write_local_mmr8(uv_scir_info->offset, value);
- }
-}
-
-static inline unsigned long uv_scir_offset(int apicid)
-{
- return SCIR_LOCAL_MMR_BASE | (apicid & 0x3f);
-}
-
-static inline void uv_set_cpu_scir_bits(int cpu, unsigned char value)
-{
- if (uv_cpu_scir_info(cpu)->state != value) {
- uv_write_global_mmr8(uv_cpu_to_pnode(cpu),
- uv_cpu_scir_info(cpu)->offset, value);
- uv_cpu_scir_info(cpu)->state = value;
- }
-}
-
/*
* Get the minimum revision number of the hub chips within the partition.
* (See UVx_HUB_REVISION_BASE above for specific values.)
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -5,7 +5,8 @@
*
* SGI UV APIC functions (note: not an Intel compatible APIC)
*
- * Copyright (C) 2007-2014 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2018-2020 Hewlett Packard Enterprise Development LP
+ * Copyright (C) 2007-2017 Silicon Graphics, Inc. All rights reserved.
*/
#include <linux/crash_dump.h>
#include <linux/cpuhotplug.h>
@@ -909,85 +910,6 @@ static __init void uv_rtc_init(void)
}
}

-/*
- * percpu heartbeat timer
- */
-static void uv_heartbeat(struct timer_list *timer)
-{
- unsigned char bits = uv_scir_info->state;
-
- /* Flip heartbeat bit: */
- bits ^= SCIR_CPU_HEARTBEAT;
-
- /* Is this CPU idle? */
- if (idle_cpu(raw_smp_processor_id()))
- bits &= ~SCIR_CPU_ACTIVITY;
- else
- bits |= SCIR_CPU_ACTIVITY;
-
- /* Update system controller interface reg: */
- uv_set_scir_bits(bits);
-
- /* Enable next timer period: */
- mod_timer(timer, jiffies + SCIR_CPU_HB_INTERVAL);
-}
-
-static int uv_heartbeat_enable(unsigned int cpu)
-{
- while (!uv_cpu_scir_info(cpu)->enabled) {
- struct timer_list *timer = &uv_cpu_scir_info(cpu)->timer;
-
- uv_set_cpu_scir_bits(cpu, SCIR_CPU_HEARTBEAT|SCIR_CPU_ACTIVITY);
- timer_setup(timer, uv_heartbeat, TIMER_PINNED);
- timer->expires = jiffies + SCIR_CPU_HB_INTERVAL;
- add_timer_on(timer, cpu);
- uv_cpu_scir_info(cpu)->enabled = 1;
-
- /* Also ensure that boot CPU is enabled: */
- cpu = 0;
- }
- return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int uv_heartbeat_disable(unsigned int cpu)
-{
- if (uv_cpu_scir_info(cpu)->enabled) {
- uv_cpu_scir_info(cpu)->enabled = 0;
- del_timer(&uv_cpu_scir_info(cpu)->timer);
- }
- uv_set_cpu_scir_bits(cpu, 0xff);
- return 0;
-}
-
-static __init void uv_scir_register_cpu_notifier(void)
-{
- cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/x2apic-uvx:online",
- uv_heartbeat_enable, uv_heartbeat_disable);
-}
-
-#else /* !CONFIG_HOTPLUG_CPU */
-
-static __init void uv_scir_register_cpu_notifier(void)
-{
-}
-
-static __init int uv_init_heartbeat(void)
-{
- int cpu;
-
- if (is_uv_system()) {
- for_each_online_cpu(cpu)
- uv_heartbeat_enable(cpu);
- }
-
- return 0;
-}
-
-late_initcall(uv_init_heartbeat);
-
-#endif /* !CONFIG_HOTPLUG_CPU */
-
/* Direct Legacy VGA I/O traffic to designated IOH */
static int uv_set_vga_state(struct pci_dev *pdev, bool decode, unsigned int command_bits, u32 flags)
{
@@ -1517,8 +1439,6 @@ static void __init uv_system_init_hub(vo
uv_hub_info_list(numa_node_id)->pnode = pnode;
else if (uv_cpu_hub_info(cpu)->pnode == 0xffff)
uv_cpu_hub_info(cpu)->pnode = pnode;
-
- uv_cpu_scir_info(cpu)->offset = uv_scir_offset(apicid);
}

for_each_node(nodeid) {
@@ -1547,7 +1467,6 @@ static void __init uv_system_init_hub(vo

uv_nmi_setup();
uv_cpu_init();
- uv_scir_register_cpu_notifier();
uv_setup_proc_files(0);

/* Register Legacy VGA I/O redirection handler: */
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