Remove unused event code and other cleanup for HUB RTC. Signed-off-by: Dimitri Sivanich <sivan...@hpe.com> --- arch/x86/platform/uv/uv_time.c | 362 +---------------------------------------- 1 file changed, 8 insertions(+), 354 deletions(-)
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c index 7af31b245636..1777b7164ff8 100644 --- a/arch/x86/platform/uv/uv_time.c +++ b/arch/x86/platform/uv/uv_time.c @@ -1,25 +1,18 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * SGI RTC clock/timer routines. + * HPE RTC clock routine. * + * Copyright (C) 2020 Hewlett Packard Enterprise, All rights reserved. * Copyright (c) 2009-2013 Silicon Graphics, Inc. All Rights Reserved. * Copyright (c) Dimitri Sivanich */ #include <linux/clockchips.h> -#include <linux/slab.h> - #include <asm/uv/uv_mmrs.h> #include <asm/uv/uv_hub.h> -#include <asm/uv/bios.h> -#include <asm/uv/uv.h> -#include <asm/apic.h> -#include <asm/cpu.h> -#define RTC_NAME "sgi_rtc" +#define RTC_NAME "hub_rtc" static u64 uv_read_rtc(struct clocksource *cs); -static int uv_rtc_next_event(unsigned long, struct clock_event_device *); -static int uv_rtc_shutdown(struct clock_event_device *evt); static struct clocksource clocksource_uv = { .name = RTC_NAME, @@ -29,325 +22,23 @@ static struct clocksource clocksource_uv = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -static struct clock_event_device clock_event_device_uv = { - .name = RTC_NAME, - .features = CLOCK_EVT_FEAT_ONESHOT, - .shift = 20, - .rating = 400, - .irq = -1, - .set_next_event = uv_rtc_next_event, - .set_state_shutdown = uv_rtc_shutdown, - .event_handler = NULL, -}; - -static DEFINE_PER_CPU(struct clock_event_device, cpu_ced); - -/* There is one of these allocated per node */ -struct uv_rtc_timer_head { - spinlock_t lock; - /* next cpu waiting for timer, local node relative: */ - int next_cpu; - /* number of cpus on this node: */ - int ncpus; - struct { - int lcpu; /* systemwide logical cpu number */ - u64 expires; /* next timer expiration for this cpu */ - } cpu[1]; -}; - -/* - * Access to uv_rtc_timer_head via blade id. - */ -static struct uv_rtc_timer_head **blade_info __read_mostly; - -static int uv_rtc_evt_enable; - -/* - * Hardware interface routines - */ - -/* Send IPIs to another node */ -static void uv_rtc_send_IPI(int cpu) -{ - unsigned long apicid, val; - int pnode; - - apicid = cpu_physical_id(cpu); - pnode = uv_apicid_to_pnode(apicid); - apicid |= uv_apicid_hibits; - val = (1UL << UVH_IPI_INT_SEND_SHFT) | - (apicid << UVH_IPI_INT_APIC_ID_SHFT) | - (X86_PLATFORM_IPI_VECTOR << UVH_IPI_INT_VECTOR_SHFT); - - uv_write_global_mmr64(pnode, UVH_IPI_INT, val); -} - -/* Check for an RTC interrupt pending */ -static int uv_intr_pending(int pnode) -{ - if (is_uv1_hub()) - return uv_read_global_mmr64(pnode, UVH_EVENT_OCCURRED0) & - UV1H_EVENT_OCCURRED0_RTC1_MASK; - else if (is_uvx_hub()) - return uv_read_global_mmr64(pnode, UVXH_EVENT_OCCURRED2) & - UVXH_EVENT_OCCURRED2_RTC_1_MASK; - return 0; -} - -/* Setup interrupt and return non-zero if early expiration occurred. */ -static int uv_setup_intr(int cpu, u64 expires) -{ - u64 val; - unsigned long apicid = cpu_physical_id(cpu) | uv_apicid_hibits; - int pnode = uv_cpu_to_pnode(cpu); - - uv_write_global_mmr64(pnode, UVH_RTC1_INT_CONFIG, - UVH_RTC1_INT_CONFIG_M_MASK); - uv_write_global_mmr64(pnode, UVH_INT_CMPB, -1L); - - if (is_uv1_hub()) - uv_write_global_mmr64(pnode, UVH_EVENT_OCCURRED0_ALIAS, - UV1H_EVENT_OCCURRED0_RTC1_MASK); - else - uv_write_global_mmr64(pnode, UVXH_EVENT_OCCURRED2_ALIAS, - UVXH_EVENT_OCCURRED2_RTC_1_MASK); - - val = (X86_PLATFORM_IPI_VECTOR << UVH_RTC1_INT_CONFIG_VECTOR_SHFT) | - ((u64)apicid << UVH_RTC1_INT_CONFIG_APIC_ID_SHFT); - - /* Set configuration */ - uv_write_global_mmr64(pnode, UVH_RTC1_INT_CONFIG, val); - /* Initialize comparator value */ - uv_write_global_mmr64(pnode, UVH_INT_CMPB, expires); - - if (uv_read_rtc(NULL) <= expires) - return 0; - - return !uv_intr_pending(pnode); -} - -/* - * Per-cpu timer tracking routines - */ - -static __init void uv_rtc_deallocate_timers(void) -{ - int bid; - - for_each_possible_blade(bid) { - kfree(blade_info[bid]); - } - kfree(blade_info); -} - -/* Allocate per-node list of cpu timer expiration times. */ -static __init int uv_rtc_allocate_timers(void) -{ - int cpu; - - blade_info = kcalloc(uv_possible_blades, sizeof(void *), GFP_KERNEL); - if (!blade_info) - return -ENOMEM; - - for_each_present_cpu(cpu) { - int nid = cpu_to_node(cpu); - int bid = uv_cpu_to_blade_id(cpu); - int bcpu = uv_cpu_blade_processor_id(cpu); - struct uv_rtc_timer_head *head = blade_info[bid]; - - if (!head) { - head = kmalloc_node(sizeof(struct uv_rtc_timer_head) + - (uv_blade_nr_possible_cpus(bid) * - 2 * sizeof(u64)), - GFP_KERNEL, nid); - if (!head) { - uv_rtc_deallocate_timers(); - return -ENOMEM; - } - spin_lock_init(&head->lock); - head->ncpus = uv_blade_nr_possible_cpus(bid); - head->next_cpu = -1; - blade_info[bid] = head; - } - - head->cpu[bcpu].lcpu = cpu; - head->cpu[bcpu].expires = ULLONG_MAX; - } - - return 0; -} - -/* Find and set the next expiring timer. */ -static void uv_rtc_find_next_timer(struct uv_rtc_timer_head *head, int pnode) -{ - u64 lowest = ULLONG_MAX; - int c, bcpu = -1; - - head->next_cpu = -1; - for (c = 0; c < head->ncpus; c++) { - u64 exp = head->cpu[c].expires; - if (exp < lowest) { - bcpu = c; - lowest = exp; - } - } - if (bcpu >= 0) { - head->next_cpu = bcpu; - c = head->cpu[bcpu].lcpu; - if (uv_setup_intr(c, lowest)) - /* If we didn't set it up in time, trigger */ - uv_rtc_send_IPI(c); - } else { - uv_write_global_mmr64(pnode, UVH_RTC1_INT_CONFIG, - UVH_RTC1_INT_CONFIG_M_MASK); - } -} - -/* - * Set expiration time for current cpu. - * - * Returns 1 if we missed the expiration time. - */ -static int uv_rtc_set_timer(int cpu, u64 expires) -{ - int pnode = uv_cpu_to_pnode(cpu); - int bid = uv_cpu_to_blade_id(cpu); - struct uv_rtc_timer_head *head = blade_info[bid]; - int bcpu = uv_cpu_blade_processor_id(cpu); - u64 *t = &head->cpu[bcpu].expires; - unsigned long flags; - int next_cpu; - - spin_lock_irqsave(&head->lock, flags); - - next_cpu = head->next_cpu; - *t = expires; - - /* Will this one be next to go off? */ - if (next_cpu < 0 || bcpu == next_cpu || - expires < head->cpu[next_cpu].expires) { - head->next_cpu = bcpu; - if (uv_setup_intr(cpu, expires)) { - *t = ULLONG_MAX; - uv_rtc_find_next_timer(head, pnode); - spin_unlock_irqrestore(&head->lock, flags); - return -ETIME; - } - } - - spin_unlock_irqrestore(&head->lock, flags); - return 0; -} - -/* - * Unset expiration time for current cpu. - * - * Returns 1 if this timer was pending. - */ -static int uv_rtc_unset_timer(int cpu, int force) -{ - int pnode = uv_cpu_to_pnode(cpu); - int bid = uv_cpu_to_blade_id(cpu); - struct uv_rtc_timer_head *head = blade_info[bid]; - int bcpu = uv_cpu_blade_processor_id(cpu); - u64 *t = &head->cpu[bcpu].expires; - unsigned long flags; - int rc = 0; - - spin_lock_irqsave(&head->lock, flags); - - if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force) - rc = 1; - - if (rc) { - *t = ULLONG_MAX; - /* Was the hardware setup for this timer? */ - if (head->next_cpu == bcpu) - uv_rtc_find_next_timer(head, pnode); - } - - spin_unlock_irqrestore(&head->lock, flags); - - return rc; -} - - -/* - * Kernel interface routines. - */ /* * Read the RTC. * * Starting with HUB rev 2.0, the UV RTC register is replicated across all - * cachelines of it's own page. This allows faster simultaneous reads - * from a given socket. + * cachelines of its own page. This allows faster simultaneous reads from + * a given socket. */ static u64 uv_read_rtc(struct clocksource *cs) { unsigned long offset; - if (uv_get_min_hub_revision_id() == 1) - offset = 0; - else - offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; + offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; return (u64)uv_read_local_mmr(UVH_RTC | offset); } -/* - * Program the next event, relative to now - */ -static int uv_rtc_next_event(unsigned long delta, - struct clock_event_device *ced) -{ - int ced_cpu = cpumask_first(ced->cpumask); - - return uv_rtc_set_timer(ced_cpu, delta + uv_read_rtc(NULL)); -} - -/* - * Shutdown the RTC timer - */ -static int uv_rtc_shutdown(struct clock_event_device *evt) -{ - int ced_cpu = cpumask_first(evt->cpumask); - - uv_rtc_unset_timer(ced_cpu, 1); - return 0; -} - -static void uv_rtc_interrupt(void) -{ - int cpu = smp_processor_id(); - struct clock_event_device *ced = &per_cpu(cpu_ced, cpu); - - if (!ced || !ced->event_handler) - return; - - if (uv_rtc_unset_timer(cpu, 0) != 1) - return; - - ced->event_handler(ced); -} - -static int __init uv_enable_evt_rtc(char *str) -{ - uv_rtc_evt_enable = 1; - - return 1; -} -__setup("uvrtcevt", uv_enable_evt_rtc); - -static __init void uv_rtc_register_clockevents(struct work_struct *dummy) -{ - struct clock_event_device *ced = this_cpu_ptr(&cpu_ced); - - *ced = clock_event_device_uv; - ced->cpumask = cpumask_of(smp_processor_id()); - clockevents_register_device(ced); -} - static __init int uv_rtc_setup_clock(void) { int rc; @@ -357,47 +48,10 @@ static __init int uv_rtc_setup_clock(void) rc = clocksource_register_hz(&clocksource_uv, sn_rtc_cycles_per_second); if (rc) - printk(KERN_INFO "UV RTC clocksource failed rc %d\n", rc); + pr_info("HUB RTC clocksource failed rc %d\n", rc); else - printk(KERN_INFO "UV RTC clocksource registered freq %lu MHz\n", + pr_info("HUB RTC clocksource registered freq %lu MHz\n", sn_rtc_cycles_per_second/(unsigned long)1E6); - - if (rc || !uv_rtc_evt_enable || x86_platform_ipi_callback) - return rc; - - /* Setup and register clockevents */ - rc = uv_rtc_allocate_timers(); - if (rc) - goto error; - - x86_platform_ipi_callback = uv_rtc_interrupt; - - clock_event_device_uv.mult = div_sc(sn_rtc_cycles_per_second, - NSEC_PER_SEC, clock_event_device_uv.shift); - - clock_event_device_uv.min_delta_ns = NSEC_PER_SEC / - sn_rtc_cycles_per_second; - clock_event_device_uv.min_delta_ticks = 1; - - clock_event_device_uv.max_delta_ns = clocksource_uv.mask * - (NSEC_PER_SEC / sn_rtc_cycles_per_second); - clock_event_device_uv.max_delta_ticks = clocksource_uv.mask; - - rc = schedule_on_each_cpu(uv_rtc_register_clockevents); - if (rc) { - x86_platform_ipi_callback = NULL; - uv_rtc_deallocate_timers(); - goto error; - } - - printk(KERN_INFO "UV RTC clockevents registered\n"); - - return 0; - -error: - clocksource_unregister(&clocksource_uv); - printk(KERN_INFO "UV RTC clockevents failed rc %d\n", rc); - return rc; } arch_initcall(uv_rtc_setup_clock); -- 2.12.3