随后，它进入内部函数\_\_disable\_irq：```c void __disable_irq(struct irq\_desc desc,unsigned int irq,bool suspend){ if (suspend) { if (!desc->action || (desc->action->flags & IRQF\_NO\_SUSPEND))return;desc->istate |=
nest_lock=nest_lock@entry=0x0 <fixed_percpu_data>, ip=18446744071580260235) at evl-v5.15.y/kernel/locking/lockdep.c:5677 \#100xffffffff81a9ecc5 in __raw_spin_lock_irqsave (lock=0xffffffff825474c0 <rcu_state>) at evl-v5.15.y/include/linux/spinlock_api_smp.h:110 \#11_raw_spin_lo...
struct task_struct *tsk = __this_cpu_read(ksoftirqd); if (tsk && tsk->state != TASK_RUNNING) wake_up_process(tsk); } 以收包软中断为例, IRQ handler 并不执行 NAPI,只是触发它,在里面会执行到 raise NET_RX_SOFTIRQ;真正的执行在 softirq,里面会调用网卡的 poll() 方法收包。IRQ handler 中...
The function flexcan_irq_state() checks the controller for CAN state changes and pushes a skb with the new state and a timestamp into the rx-offload framework. This patch optimizes the function by only reading the timestamp, if a state change is detected. Signed-off-by: Marc Kleine-...
大家都知道,ARM有IRQ, FIQ, USR,SVC,ABORT等各种模式。当系统收到IRQ的时候,会进入ARM的IRQ模式。那么,ARMLinux各种驱动的中断服务程序工作在ARM的IRQ模式吗? 答案是否定的。 我们加一段汇编来读CPSR: 然后我们随便找一个ARM Linux的中断服务程序去打印CPSR: ...
if (desc->istate & IRQS_POLL_INPROGRESS ||//caq:当前中断正在被处理,注意不是napi的处理 irq_settings_is_polled(desc)) return; if (bad_action_ret(action_ret)) {//caq:只有action_return值当中有异常的 report_bad_irq(desc, action_ret);//caq:才会报bad,而且直接返回了 ...
structirq_state{intirq_count[NR_IRQS]; ktime_t irq_time_stamp[NR_IRQS]; } b. 使用tracepoint,可以让我们每次进入某个IRQ时,都先进钩子函数,所以,在这里可以统计IRQ发生的次数。 voidirq_handler_entry_probe(void*data,intirq,structirqaction *action) ...
irq_state_clr_disabled(desc); #正常情况下回调用chip来使能irq if (desc->irq_data.chip->irq_enable) desc->irq_data.chip->irq_enable(&desc->irq_data); else desc->irq_data.chip->irq_unmask(&desc->irq_data); irq_state_clr_masked(desc); ...
importRPi.GPIOasGPIOimporttime# 设置 GPIO 模式GPIO.setmode(GPIO.BCM)# 定义按钮和 LED 引脚BUTTON_PIN=18LED_PIN=23# 设置引脚方向GPIO.setup(BUTTON_PIN,GPIO.IN,pull_up_down=GPIO.PUD_UP)GPIO.setup(LED_PIN,GPIO.OUT)defbutton_callback(channel):# 当按钮被按下时,切换 LED 状态current_state=GPIO...
1. Does the IRQ state change while the command is being sent? What should we do if it can change? 2. What happens when IRQ = H and a command are issued at the same time? In our system, IRQ is checked by polling instead of interrupt processing, so it takes some tim...