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SubjectRe: [PATCH v2 02/13] x86/platform/uv: Remove SCIR MMR references for UVY systems.
Acked-by: Steve Wahl <steve.wahl@hpe.com>

On Wed, Sep 16, 2020 at 02:20:28PM -0500, Mike Travis wrote:
> 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 | 43 ++--------------
> arch/x86/kernel/apic/x2apic_uv_x.c | 82 ------------------------------
> 2 files changed, 3 insertions(+), 122 deletions(-)
>
> diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
> index 100d66806503..b21228db75bf 100644
> --- a/arch/x86/include/asm/uv/uv_hub.h
> +++ b/arch/x86/include/asm/uv/uv_hub.h
> @@ -129,17 +129,6 @@
> */
> #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 +180,13 @@ 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 +283,9 @@ 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 +758,6 @@ DECLARE_PER_CPU(struct uv_cpu_nmi_s, uv_cpu_nmi);
> #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.)
> diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
> index 0b6eea3f54e6..f51fabf56010 100644
> --- a/arch/x86/kernel/apic/x2apic_uv_x.c
> +++ b/arch/x86/kernel/apic/x2apic_uv_x.c
> @@ -909,85 +909,6 @@ 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 +1438,6 @@ static void __init uv_system_init_hub(void)
> 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 +1466,6 @@ static void __init uv_system_init_hub(void)
>
> uv_nmi_setup();
> uv_cpu_init();
> - uv_scir_register_cpu_notifier();
> uv_setup_proc_files(0);
>
> /* Register Legacy VGA I/O redirection handler: */
> --
> 2.21.0
>

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