From 071106ecf68c401173c58808b1cf5f68cc50d390 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 05 Jan 2024 08:39:27 +0000
Subject: [PATCH] change wifi driver to cypress
---
kernel/kernel/irq_work.c | 135 ++++----------------------------------------
1 files changed, 14 insertions(+), 121 deletions(-)
diff --git a/kernel/kernel/irq_work.c b/kernel/kernel/irq_work.c
index 820798c..e0ed16d 100644
--- a/kernel/kernel/irq_work.c
+++ b/kernel/kernel/irq_work.c
@@ -18,37 +18,11 @@
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/smp.h>
-#include <linux/smpboot.h>
-#include <linux/interrupt.h>
#include <asm/processor.h>
static DEFINE_PER_CPU(struct llist_head, raised_list);
static DEFINE_PER_CPU(struct llist_head, lazy_list);
-static DEFINE_PER_CPU(struct task_struct *, irq_workd);
-
-static void wake_irq_workd(void)
-{
- struct task_struct *tsk = __this_cpu_read(irq_workd);
-
- if (!llist_empty(this_cpu_ptr(&lazy_list)) && tsk)
- wake_up_process(tsk);
-}
-
-#ifdef CONFIG_SMP
-static void irq_work_wake(struct irq_work *entry)
-{
- wake_irq_workd();
-}
-
-static DEFINE_PER_CPU(struct irq_work, irq_work_wakeup) =
- IRQ_WORK_INIT_HARD(irq_work_wake);
-#endif
-
-static int irq_workd_should_run(unsigned int cpu)
-{
- return !llist_empty(this_cpu_ptr(&lazy_list));
-}
/*
* Claim the entry so that no one else will poke at it.
@@ -78,29 +52,15 @@
/* Enqueue on current CPU, work must already be claimed and preempt disabled */
static void __irq_work_queue_local(struct irq_work *work)
{
- struct llist_head *list;
- bool rt_lazy_work = false;
- bool lazy_work = false;
- int work_flags;
-
- work_flags = atomic_read(&work->flags);
- if (work_flags & IRQ_WORK_LAZY)
- lazy_work = true;
- else if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
- !(work_flags & IRQ_WORK_HARD_IRQ))
- rt_lazy_work = true;
-
- if (lazy_work || rt_lazy_work)
- list = this_cpu_ptr(&lazy_list);
- else
- list = this_cpu_ptr(&raised_list);
-
- if (!llist_add(&work->llnode, list))
- return;
-
/* If the work is "lazy", handle it from next tick if any */
- if (!lazy_work || tick_nohz_tick_stopped())
- arch_irq_work_raise();
+ if (atomic_read(&work->flags) & IRQ_WORK_LAZY) {
+ if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) &&
+ tick_nohz_tick_stopped())
+ arch_irq_work_raise();
+ } else {
+ if (llist_add(&work->llnode, this_cpu_ptr(&raised_list)))
+ arch_irq_work_raise();
+ }
}
/* Enqueue the irq work @work on the current CPU */
@@ -142,28 +102,10 @@
if (cpu != smp_processor_id()) {
/* Arch remote IPI send/receive backend aren't NMI safe */
WARN_ON_ONCE(in_nmi());
-
- /*
- * On PREEMPT_RT the items which are not marked as
- * IRQ_WORK_HARD_IRQ are added to the lazy list and a HARD work
- * item is used on the remote CPU to wake the thread.
- */
- if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
- !(atomic_read(&work->flags) & IRQ_WORK_HARD_IRQ)) {
-
- if (!llist_add(&work->llnode, &per_cpu(lazy_list, cpu)))
- goto out;
-
- work = &per_cpu(irq_work_wakeup, cpu);
- if (!irq_work_claim(work))
- goto out;
- }
-
__smp_call_single_queue(cpu, &work->llnode);
} else {
__irq_work_queue_local(work);
}
-out:
preempt_enable();
return true;
@@ -178,8 +120,9 @@
raised = this_cpu_ptr(&raised_list);
lazy = this_cpu_ptr(&lazy_list);
- if (llist_empty(raised) && llist_empty(lazy))
- return false;
+ if (llist_empty(raised) || arch_irq_work_has_interrupt())
+ if (llist_empty(lazy))
+ return false;
/* All work should have been flushed before going offline */
WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
@@ -210,10 +153,6 @@
*/
flags &= ~IRQ_WORK_PENDING;
(void)atomic_cmpxchg(&work->flags, flags, flags & ~IRQ_WORK_BUSY);
-
- if ((IS_ENABLED(CONFIG_PREEMPT_RT) && !irq_work_is_hard(work)) ||
- !arch_irq_work_has_interrupt())
- rcuwait_wake_up(&work->irqwait);
}
static void irq_work_run_list(struct llist_head *list)
@@ -221,12 +160,7 @@
struct irq_work *work, *tmp;
struct llist_node *llnode;
- /*
- * On PREEMPT_RT IRQ-work which is not marked as HARD will be processed
- * in a per-CPU thread in preemptible context. Only the items which are
- * marked as IRQ_WORK_HARD_IRQ will be processed in hardirq context.
- */
- BUG_ON(!irqs_disabled() && !IS_ENABLED(CONFIG_PREEMPT_RT));
+ BUG_ON(!irqs_disabled());
if (llist_empty(list))
return;
@@ -243,10 +177,7 @@
void irq_work_run(void)
{
irq_work_run_list(this_cpu_ptr(&raised_list));
- if (!IS_ENABLED(CONFIG_PREEMPT_RT))
- irq_work_run_list(this_cpu_ptr(&lazy_list));
- else
- wake_irq_workd();
+ irq_work_run_list(this_cpu_ptr(&lazy_list));
}
EXPORT_SYMBOL_GPL(irq_work_run);
@@ -256,11 +187,7 @@
if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
irq_work_run_list(raised);
-
- if (!IS_ENABLED(CONFIG_PREEMPT_RT))
- irq_work_run_list(this_cpu_ptr(&lazy_list));
- else
- wake_irq_workd();
+ irq_work_run_list(this_cpu_ptr(&lazy_list));
}
/*
@@ -270,42 +197,8 @@
void irq_work_sync(struct irq_work *work)
{
lockdep_assert_irqs_enabled();
- might_sleep();
-
- if ((IS_ENABLED(CONFIG_PREEMPT_RT) && !irq_work_is_hard(work)) ||
- !arch_irq_work_has_interrupt()) {
- rcuwait_wait_event(&work->irqwait, !irq_work_is_busy(work),
- TASK_UNINTERRUPTIBLE);
- return;
- }
while (atomic_read(&work->flags) & IRQ_WORK_BUSY)
cpu_relax();
}
EXPORT_SYMBOL_GPL(irq_work_sync);
-
-static void run_irq_workd(unsigned int cpu)
-{
- irq_work_run_list(this_cpu_ptr(&lazy_list));
-}
-
-static void irq_workd_setup(unsigned int cpu)
-{
- sched_set_fifo_low(current);
-}
-
-static struct smp_hotplug_thread irqwork_threads = {
- .store = &irq_workd,
- .setup = irq_workd_setup,
- .thread_should_run = irq_workd_should_run,
- .thread_fn = run_irq_workd,
- .thread_comm = "irq_work/%u",
-};
-
-static __init int irq_work_init_threads(void)
-{
- if (IS_ENABLED(CONFIG_PREEMPT_RT))
- BUG_ON(smpboot_register_percpu_thread(&irqwork_threads));
- return 0;
-}
-early_initcall(irq_work_init_threads);
--
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