1 use core::{
2 any::Any,
3 fmt::Debug,
4 sync::atomic::{AtomicI64, Ordering},
5 };
6
7 use alloc::{
8 collections::{btree_map, BTreeMap},
9 string::{String, ToString},
10 sync::{Arc, Weak},
11 vec::Vec,
12 };
13 use system_error::SystemError;
14
15 use crate::{
16 arch::{interrupt::TrapFrame, CurrentIrqArch},
17 driver::base::{
18 device::DeviceId,
19 kobject::{KObjType, KObject, KObjectState, LockedKObjectState},
20 kset::KSet,
21 },
22 filesystem::kernfs::KernFSInode,
23 libs::{
24 cpumask::CpuMask,
25 mutex::{Mutex, MutexGuard},
26 rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard},
27 spinlock::{SpinLock, SpinLockGuard},
28 },
29 mm::percpu::PerCpuVar,
30 process::ProcessControlBlock,
31 sched::completion::Completion,
32 smp::cpu::smp_cpu_manager,
33 };
34
35 use super::{
36 dummychip::no_irq_chip,
37 handle::bad_irq_handler,
38 irqchip::IrqChip,
39 irqdata::{IrqCommonData, IrqData, IrqHandlerData, IrqLineStatus, IrqStatus},
40 irqdomain::{irq_domain_manager, IrqDomain},
41 sysfs::{irq_sysfs_del, IrqKObjType},
42 HardwareIrqNumber, InterruptArch, IrqNumber,
43 };
44
45 /// 中断流处理程序
46 pub trait IrqFlowHandler: Debug + Send + Sync + Any {
handle(&self, irq_desc: &Arc<IrqDesc>, trap_frame: &mut TrapFrame)47 fn handle(&self, irq_desc: &Arc<IrqDesc>, trap_frame: &mut TrapFrame);
48 }
49
50 /// 中断处理程序
51 pub trait IrqHandler: Debug + Send + Sync + Any {
handle( &self, irq: IrqNumber, static_data: Option<&dyn IrqHandlerData>, dynamic_data: Option<Arc<dyn IrqHandlerData>>, ) -> Result<IrqReturn, SystemError>52 fn handle(
53 &self,
54 irq: IrqNumber,
55 static_data: Option<&dyn IrqHandlerData>,
56 dynamic_data: Option<Arc<dyn IrqHandlerData>>,
57 ) -> Result<IrqReturn, SystemError>;
58 }
59
60 /// 中断处理函数返回值
61 ///
62 /// 用于指示中断处理函数是否处理了中断
63 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
64 pub enum IrqReturn {
65 /// 中断未被处理
66 NotHandled,
67 /// 中断已被处理
68 Handled,
69 /// 中断已被处理，并且需要唤醒中断线程
70 WakeThread,
71 }
72
73 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/include/linux/irqdesc.h#55
74 #[derive(Debug)]
75 pub struct IrqDesc {
76 inner: SpinLock<InnerIrqDesc>,
77
78 handler: RwLock<Option<&'static dyn IrqFlowHandler>>,
79 /// 一个用于串行化 request_irq()和free_irq() 的互斥锁
80 request_mutex: Mutex<()>,
81 kobj_state: LockedKObjectState,
82 /// 当前描述符内正在运行的中断线程数
83 threads_active: AtomicI64,
84 }
85
86 impl IrqDesc {
87 #[inline(never)]
new(irq: IrqNumber, name: Option<String>, irqd_flags: IrqStatus) -> Arc<Self>88 pub fn new(irq: IrqNumber, name: Option<String>, irqd_flags: IrqStatus) -> Arc<Self> {
89 // 初始化的过程参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/irqdesc.c#392
90 let common_data = Arc::new(IrqCommonData::new());
91 let irq_data = Arc::new(IrqData::new(
92 irq,
93 HardwareIrqNumber::new(irq.data()),
94 common_data.clone(),
95 no_irq_chip(),
96 ));
97
98 irq_data.irqd_set(IrqStatus::IRQD_IRQ_DISABLED);
99 common_data.insert_status(IrqStatus::IRQD_IRQ_MASKED);
100
101 let irq_desc = IrqDesc {
102 inner: SpinLock::new(InnerIrqDesc {
103 percpu_affinity: None,
104 percpu_enabled: None,
105 common_data,
106 irq_data,
107 desc_internal_state: IrqDescState::empty(),
108 line_status: IrqLineStatus::empty(),
109 actions: Vec::new(),
110 name,
111 parent_irq: None,
112 depth: 1,
113 wake_depth: 0,
114 kern_inode: None,
115 kset: None,
116 parent_kobj: None,
117 threads_oneshot: 0,
118 }),
119 request_mutex: Mutex::new(()),
120 handler: RwLock::new(None),
121 kobj_state: LockedKObjectState::new(Some(KObjectState::INITIALIZED)),
122 threads_active: AtomicI64::new(0),
123 };
124 let irq_desc = Arc::new(irq_desc);
125 irq_desc.irq_data().set_irq_desc(Arc::downgrade(&irq_desc));
126 irq_desc.set_handler(bad_irq_handler());
127 irq_desc.inner().irq_data.irqd_set(irqd_flags);
128
129 return irq_desc;
130 }
131
132 /// 返回当前活跃的中断线程数量
133 #[allow(dead_code)]
threads_active(&self) -> i64134 pub fn threads_active(&self) -> i64 {
135 self.threads_active.load(Ordering::SeqCst)
136 }
137
138 /// 增加当前活跃的中断线程数量, 返回增加前的值
inc_threads_active(&self) -> i64139 pub fn inc_threads_active(&self) -> i64 {
140 self.threads_active.fetch_add(1, Ordering::SeqCst)
141 }
142
143 /// 减少当前活跃的中断线程数量, 返回减少前的值
144 #[allow(dead_code)]
dec_threads_active(&self) -> i64145 pub fn dec_threads_active(&self) -> i64 {
146 self.threads_active.fetch_sub(1, Ordering::SeqCst)
147 }
148
set_handler(&self, handler: &'static dyn IrqFlowHandler)149 pub fn set_handler(&self, handler: &'static dyn IrqFlowHandler) {
150 self.chip_bus_lock();
151 let mut guard = self.handler.write_irqsave();
152 *guard = Some(handler);
153 self.chip_bus_sync_unlock();
154 }
155
156 /// 设置中断处理程序（不对desc->inner）
157 ///
158 ///
159 /// ## Safety
160 ///
161 /// 需要保证irq_data和chip是当前irqdesc的
set_handler_no_lock_inner( &self, handler: &'static dyn IrqFlowHandler, irq_data: &Arc<IrqData>, chip: &Arc<dyn IrqChip>, )162 pub fn set_handler_no_lock_inner(
163 &self,
164 handler: &'static dyn IrqFlowHandler,
165 irq_data: &Arc<IrqData>,
166 chip: &Arc<dyn IrqChip>,
167 ) {
168 chip.irq_bus_lock(irq_data).ok();
169 let mut guard = self.handler.write_irqsave();
170 *guard = Some(handler);
171 chip.irq_bus_sync_unlock(irq_data).ok();
172 }
173
handler(&self) -> Option<&'static dyn IrqFlowHandler>174 pub fn handler(&self) -> Option<&'static dyn IrqFlowHandler> {
175 let guard = self.handler.read_irqsave();
176 *guard
177 }
178
inner(&self) -> SpinLockGuard<InnerIrqDesc>179 pub fn inner(&self) -> SpinLockGuard<InnerIrqDesc> {
180 self.inner.lock_irqsave()
181 }
182
actions(&self) -> Vec<Arc<IrqAction>>183 pub fn actions(&self) -> Vec<Arc<IrqAction>> {
184 self.inner().actions.clone()
185 }
186
187 /// 对中断请求过程加锁
request_mutex_lock(&self) -> MutexGuard<()>188 pub fn request_mutex_lock(&self) -> MutexGuard<()> {
189 self.request_mutex.lock()
190 }
191
irq(&self) -> IrqNumber192 pub fn irq(&self) -> IrqNumber {
193 self.inner().irq_data.irq()
194 }
195
hardware_irq(&self) -> HardwareIrqNumber196 pub fn hardware_irq(&self) -> HardwareIrqNumber {
197 self.inner().irq_data.hardware_irq()
198 }
199
irq_data(&self) -> Arc<IrqData>200 pub fn irq_data(&self) -> Arc<IrqData> {
201 self.inner().irq_data.clone()
202 }
203
204 /// 标记当前irq描述符已经被添加到sysfs
mark_in_sysfs(&self)205 pub fn mark_in_sysfs(&self) {
206 self.inner()
207 .desc_internal_state
208 .insert(IrqDescState::IRQS_SYSFS);
209 }
210
mark_not_in_sysfs(&self)211 pub fn mark_not_in_sysfs(&self) {
212 self.inner()
213 .desc_internal_state
214 .remove(IrqDescState::IRQS_SYSFS);
215 }
216
217 /// 判断当前描述符是否已经添加到了sysfs
in_sysfs(&self) -> bool218 pub fn in_sysfs(&self) -> bool {
219 self.inner()
220 .desc_internal_state
221 .contains(IrqDescState::IRQS_SYSFS)
222 }
223
name(&self) -> Option<String>224 pub fn name(&self) -> Option<String> {
225 self.inner().name.clone()
226 }
227
can_request(&self) -> bool228 pub fn can_request(&self) -> bool {
229 self.inner().can_request()
230 }
231
232 #[allow(dead_code)]
set_norequest(&self)233 pub fn set_norequest(&self) {
234 self.inner().set_norequest();
235 }
236
237 #[allow(dead_code)]
clear_norequest(&self)238 pub fn clear_norequest(&self) {
239 self.inner().clear_norequest();
240 }
241
nested_thread(&self) -> bool242 pub fn nested_thread(&self) -> bool {
243 self.inner().nested_thread()
244 }
245
246 /// 中断是否可以线程化
can_thread(&self) -> bool247 pub fn can_thread(&self) -> bool {
248 !self
249 .inner()
250 .line_status
251 .contains(IrqLineStatus::IRQ_NOTHREAD)
252 }
253
chip_bus_lock(&self)254 pub fn chip_bus_lock(&self) {
255 let irq_data = self.inner().irq_data.clone();
256 irq_data
257 .chip_info_read_irqsave()
258 .chip()
259 .irq_bus_lock(&irq_data)
260 .ok();
261 }
262
263 /// 同步释放低速总线锁
264 ///
265 /// ## 锁
266 ///
267 /// 进入此函数时，必须持有低速总线锁，并且desc的inner锁和irqdata的inner锁
268 /// 必须已经释放。否则将死锁。
chip_bus_sync_unlock(&self)269 pub fn chip_bus_sync_unlock(&self) {
270 let irq_data = self.inner().irq_data.clone();
271 irq_data
272 .chip_info_write_irqsave()
273 .chip()
274 .irq_bus_sync_unlock(&irq_data)
275 .ok();
276 }
277
set_percpu_devid_flags(&self)278 pub fn set_percpu_devid_flags(&self) {
279 self.modify_status(
280 IrqLineStatus::empty(),
281 IrqLineStatus::IRQ_NOAUTOEN
282 | IrqLineStatus::IRQ_PER_CPU
283 | IrqLineStatus::IRQ_NOTHREAD
284 | IrqLineStatus::IRQ_NOPROBE
285 | IrqLineStatus::IRQ_PER_CPU_DEVID,
286 );
287 }
288
set_probe(&self)289 pub fn set_probe(&self) {
290 self.modify_status(IrqLineStatus::IRQ_NOPROBE, IrqLineStatus::empty());
291 }
292
set_noprobe(&self)293 pub fn set_noprobe(&self) {
294 self.modify_status(IrqLineStatus::empty(), IrqLineStatus::IRQ_NOPROBE);
295 }
296
modify_status(&self, clear: IrqLineStatus, set: IrqLineStatus)297 pub fn modify_status(&self, clear: IrqLineStatus, set: IrqLineStatus) {
298 let mut desc_guard = self.inner();
299 desc_guard.line_status.remove(clear);
300 desc_guard.line_status.insert(set);
301
302 let mut trigger = desc_guard.common_data().trigger_type();
303
304 desc_guard.common_data().clear_status(
305 IrqStatus::IRQD_NO_BALANCING
306 | IrqStatus::IRQD_PER_CPU
307 | IrqStatus::IRQD_TRIGGER_MASK
308 | IrqStatus::IRQD_LEVEL
309 | IrqStatus::IRQD_MOVE_PCNTXT,
310 );
311
312 if desc_guard
313 .line_status
314 .contains(IrqLineStatus::IRQ_NO_BALANCING)
315 {
316 desc_guard
317 .common_data()
318 .insert_status(IrqStatus::IRQD_NO_BALANCING);
319 }
320
321 if desc_guard.line_status.contains(IrqLineStatus::IRQ_PER_CPU) {
322 desc_guard
323 .common_data()
324 .insert_status(IrqStatus::IRQD_PER_CPU);
325 }
326
327 if desc_guard
328 .line_status
329 .contains(IrqLineStatus::IRQ_MOVE_PCNTXT)
330 {
331 desc_guard
332 .common_data()
333 .insert_status(IrqStatus::IRQD_MOVE_PCNTXT);
334 }
335
336 if desc_guard.line_status.is_level_type() {
337 desc_guard
338 .common_data()
339 .insert_status(IrqStatus::IRQD_LEVEL);
340 }
341
342 let tmp = desc_guard.line_status.trigger_type();
343
344 if tmp != IrqLineStatus::IRQ_TYPE_NONE {
345 trigger = tmp;
346 }
347
348 desc_guard.common_data().set_trigger_type(trigger);
349 }
350 }
351
352 #[allow(dead_code)]
353 #[derive(Debug)]
354 pub struct InnerIrqDesc {
355 /// per irq and chip data passed down to chip functions
356 common_data: Arc<IrqCommonData>,
357 irq_data: Arc<IrqData>,
358 actions: Vec<Arc<IrqAction>>,
359 name: Option<String>,
360 parent_irq: Option<IrqNumber>,
361 /// nested irq disables
362 depth: u32,
363 /// nested wake enables
364 wake_depth: u32,
365 desc_internal_state: IrqDescState,
366 /// 中断线的状态
367 line_status: IrqLineStatus,
368
369 kern_inode: Option<Arc<KernFSInode>>,
370 kset: Option<Arc<KSet>>,
371 parent_kobj: Option<Weak<dyn KObject>>,
372 /// per-cpu enabled mask
373 percpu_enabled: Option<CpuMask>,
374 /// per-cpu affinity
375 percpu_affinity: Option<CpuMask>,
376 // wait_for_threads: EventWaitQueue
377 /// bitfield to handle shared oneshot threads
378 threads_oneshot: u64,
379 }
380
381 impl InnerIrqDesc {
name(&self) -> Option<&String>382 pub fn name(&self) -> Option<&String> {
383 self.name.as_ref()
384 }
385
386 #[allow(dead_code)]
set_name(&mut self, name: Option<String>)387 pub fn set_name(&mut self, name: Option<String>) {
388 self.name = name;
389 }
390
can_request(&self) -> bool391 pub fn can_request(&self) -> bool {
392 !self.line_status.contains(IrqLineStatus::IRQ_NOREQUEST)
393 }
394
395 #[allow(dead_code)]
set_norequest(&mut self)396 pub fn set_norequest(&mut self) {
397 self.line_status.insert(IrqLineStatus::IRQ_NOREQUEST);
398 }
399
400 #[allow(dead_code)]
clear_norequest(&mut self)401 pub fn clear_norequest(&mut self) {
402 self.line_status.remove(IrqLineStatus::IRQ_NOREQUEST);
403 }
404
405 #[allow(dead_code)]
set_noprobe(&mut self)406 pub fn set_noprobe(&mut self) {
407 self.line_status.insert(IrqLineStatus::IRQ_NOPROBE);
408 }
409
410 #[allow(dead_code)]
clear_noprobe(&mut self)411 pub fn clear_noprobe(&mut self) {
412 self.line_status.remove(IrqLineStatus::IRQ_NOPROBE);
413 }
414
set_nothread(&mut self)415 pub fn set_nothread(&mut self) {
416 self.line_status.insert(IrqLineStatus::IRQ_NOTHREAD);
417 }
418
clear_nothread(&mut self)419 pub fn clear_nothread(&mut self) {
420 self.line_status.remove(IrqLineStatus::IRQ_NOTHREAD);
421 }
422
nested_thread(&self) -> bool423 pub fn nested_thread(&self) -> bool {
424 self.line_status.contains(IrqLineStatus::IRQ_NESTED_THREAD)
425 }
426
line_status_set_per_cpu(&mut self)427 pub fn line_status_set_per_cpu(&mut self) {
428 self.line_status.insert(IrqLineStatus::IRQ_PER_CPU);
429 }
430
431 #[allow(dead_code)]
line_status_clear_per_cpu(&mut self)432 pub fn line_status_clear_per_cpu(&mut self) {
433 self.line_status.remove(IrqLineStatus::IRQ_PER_CPU);
434 }
435
436 #[allow(dead_code)]
line_status(&self) -> &IrqLineStatus437 pub fn line_status(&self) -> &IrqLineStatus {
438 &self.line_status
439 }
440
line_status_set_no_debug(&mut self)441 pub fn line_status_set_no_debug(&mut self) {
442 self.line_status.insert(IrqLineStatus::IRQ_NO_BALANCING);
443 }
444
445 #[allow(dead_code)]
line_status_clear_no_debug(&mut self)446 pub fn line_status_clear_no_debug(&mut self) {
447 self.line_status.remove(IrqLineStatus::IRQ_NO_BALANCING);
448 }
449
can_autoenable(&self) -> bool450 pub fn can_autoenable(&self) -> bool {
451 !self.line_status.contains(IrqLineStatus::IRQ_NOAUTOEN)
452 }
453
can_thread(&self) -> bool454 pub fn can_thread(&self) -> bool {
455 !self.line_status.contains(IrqLineStatus::IRQ_NOTHREAD)
456 }
457
threads_oneshot(&self) -> u64458 pub fn threads_oneshot(&self) -> u64 {
459 self.threads_oneshot
460 }
461
462 /// 中断是否可以设置CPU亲和性
can_set_affinity(&self) -> bool463 pub fn can_set_affinity(&self) -> bool {
464 if !self.common_data.status().can_balance()
465 || !self
466 .irq_data()
467 .chip_info_read_irqsave()
468 .chip()
469 .can_set_affinity()
470 {
471 return false;
472 }
473
474 return true;
475 }
476
actions(&self) -> &Vec<Arc<IrqAction>>477 pub fn actions(&self) -> &Vec<Arc<IrqAction>> {
478 &self.actions
479 }
480
add_action(&mut self, action: Arc<IrqAction>)481 pub fn add_action(&mut self, action: Arc<IrqAction>) {
482 self.actions.push(action);
483 }
484
clear_actions(&mut self)485 pub fn clear_actions(&mut self) {
486 self.actions.clear();
487 }
488
remove_action(&mut self, action: &Arc<IrqAction>)489 pub fn remove_action(&mut self, action: &Arc<IrqAction>) {
490 self.actions.retain(|a| !Arc::ptr_eq(a, action));
491 }
492
internal_state(&self) -> &IrqDescState493 pub fn internal_state(&self) -> &IrqDescState {
494 &self.desc_internal_state
495 }
496
internal_state_mut(&mut self) -> &mut IrqDescState497 pub(super) fn internal_state_mut(&mut self) -> &mut IrqDescState {
498 &mut self.desc_internal_state
499 }
500
irq_data(&self) -> &Arc<IrqData>501 pub fn irq_data(&self) -> &Arc<IrqData> {
502 &self.irq_data
503 }
504
common_data(&self) -> &Arc<IrqCommonData>505 pub fn common_data(&self) -> &Arc<IrqCommonData> {
506 &self.common_data
507 }
508
depth(&self) -> u32509 pub fn depth(&self) -> u32 {
510 self.depth
511 }
512
wake_depth(&self) -> u32513 pub fn wake_depth(&self) -> u32 {
514 self.wake_depth
515 }
516
set_depth(&mut self, depth: u32)517 pub fn set_depth(&mut self, depth: u32) {
518 self.depth = depth;
519 }
520
set_trigger_type(&mut self, trigger: IrqLineStatus)521 pub fn set_trigger_type(&mut self, trigger: IrqLineStatus) {
522 self.line_status.remove(IrqLineStatus::IRQ_TYPE_SENSE_MASK);
523 self.line_status
524 .insert(trigger & IrqLineStatus::IRQ_TYPE_SENSE_MASK);
525 }
526
clear_level(&mut self)527 pub fn clear_level(&mut self) {
528 self.line_status.remove(IrqLineStatus::IRQ_LEVEL);
529 }
530
set_level(&mut self)531 pub fn set_level(&mut self) {
532 self.line_status.insert(IrqLineStatus::IRQ_LEVEL);
533 }
534
percpu_enabled(&self) -> &Option<CpuMask>535 pub fn percpu_enabled(&self) -> &Option<CpuMask> {
536 &self.percpu_enabled
537 }
538
percpu_enabled_mut(&mut self) -> &mut Option<CpuMask>539 pub fn percpu_enabled_mut(&mut self) -> &mut Option<CpuMask> {
540 &mut self.percpu_enabled
541 }
542
percpu_affinity(&self) -> &Option<CpuMask>543 pub fn percpu_affinity(&self) -> &Option<CpuMask> {
544 &self.percpu_affinity
545 }
546
percpu_affinity_mut(&mut self) -> &mut Option<CpuMask>547 pub fn percpu_affinity_mut(&mut self) -> &mut Option<CpuMask> {
548 &mut self.percpu_affinity
549 }
550 }
551
552 impl KObject for IrqDesc {
as_any_ref(&self) -> &dyn Any553 fn as_any_ref(&self) -> &dyn Any {
554 self
555 }
556
set_inode(&self, inode: Option<Arc<KernFSInode>>)557 fn set_inode(&self, inode: Option<Arc<KernFSInode>>) {
558 self.inner().kern_inode = inode;
559 }
560
inode(&self) -> Option<Arc<KernFSInode>>561 fn inode(&self) -> Option<Arc<KernFSInode>> {
562 self.inner().kern_inode.clone()
563 }
564
parent(&self) -> Option<Weak<dyn KObject>>565 fn parent(&self) -> Option<Weak<dyn KObject>> {
566 self.inner().parent_kobj.clone()
567 }
568
set_parent(&self, parent: Option<Weak<dyn KObject>>)569 fn set_parent(&self, parent: Option<Weak<dyn KObject>>) {
570 self.inner().parent_kobj = parent;
571 }
572
kset(&self) -> Option<Arc<KSet>>573 fn kset(&self) -> Option<Arc<KSet>> {
574 self.inner().kset.clone()
575 }
576
set_kset(&self, kset: Option<Arc<KSet>>)577 fn set_kset(&self, kset: Option<Arc<KSet>>) {
578 self.inner().kset = kset;
579 }
580
kobj_type(&self) -> Option<&'static dyn KObjType>581 fn kobj_type(&self) -> Option<&'static dyn KObjType> {
582 Some(&IrqKObjType)
583 }
584
set_kobj_type(&self, _ktype: Option<&'static dyn KObjType>)585 fn set_kobj_type(&self, _ktype: Option<&'static dyn KObjType>) {}
586
name(&self) -> String587 fn name(&self) -> String {
588 self.inner().irq_data.irq().data().to_string()
589 }
590
set_name(&self, _name: String)591 fn set_name(&self, _name: String) {}
592
kobj_state(&self) -> RwLockReadGuard<KObjectState>593 fn kobj_state(&self) -> RwLockReadGuard<KObjectState> {
594 self.kobj_state.read()
595 }
596
kobj_state_mut(&self) -> RwLockWriteGuard<KObjectState>597 fn kobj_state_mut(&self) -> RwLockWriteGuard<KObjectState> {
598 self.kobj_state.write()
599 }
600
set_kobj_state(&self, state: KObjectState)601 fn set_kobj_state(&self, state: KObjectState) {
602 *self.kobj_state_mut() = state;
603 }
604 }
605
606 bitflags! {
607 /// Bit masks for desc->desc_internal_state
608 pub struct IrqDescState: u32 {
609 /// autodetection in progress
610 const IRQS_AUTODETECT = 0x00000001;
611 /// was disabled due to spurious interrupt detection
612 const IRQS_SPURIOUS_DISABLED = 0x00000002;
613 /// polling in progress
614 const IRQS_POLL_INPROGRESS = 0x00000008;
615 /// irq is not unmasked in primary handler
616 const IRQS_ONESHOT = 0x00000020;
617 /// irq is replayed
618 const IRQS_REPLAY = 0x00000040;
619 /// irq is waiting
620 const IRQS_WAITING = 0x00000080;
621 /// irq is pending and replayed later
622 const IRQS_PENDING = 0x00000200;
623 /// irq is suspended
624 const IRQS_SUSPENDED = 0x00000800;
625 /// irq line is used to deliver NMIs
626 const IRQS_NMI = 0x00002000;
627 /// descriptor has been added to sysfs
628 const IRQS_SYSFS = 0x00004000;
629 }
630 }
631
632 /// 每个中断的响应动作的描述符
633 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/include/linux/interrupt.h#118
634 #[allow(dead_code)]
635 #[derive(Debug)]
636 pub struct IrqAction {
637 inner: SpinLock<InnerIrqAction>,
638 /// 用于等待线程被创建的完成量
639 thread_completion: Completion,
640 }
641
642 impl IrqAction {
643 #[allow(dead_code)]
new( irq: IrqNumber, name: String, handler: Option<&'static dyn IrqHandler>, thread_fn: Option<&'static dyn IrqHandler>, ) -> Arc<Self>644 pub fn new(
645 irq: IrqNumber,
646 name: String,
647 handler: Option<&'static dyn IrqHandler>,
648 thread_fn: Option<&'static dyn IrqHandler>,
649 ) -> Arc<Self> {
650 let action: IrqAction = IrqAction {
651 inner: SpinLock::new(InnerIrqAction {
652 dev_id: None,
653 per_cpu_dev_id: None,
654 handler,
655 thread_fn,
656 thread: None,
657 secondary: None,
658 irq,
659 flags: IrqHandleFlags::empty(),
660 name,
661 thread_flags: ThreadedHandlerFlags::empty(),
662 }),
663 thread_completion: Completion::new(),
664 };
665
666 return Arc::new(action);
667 }
668
inner(&self) -> SpinLockGuard<InnerIrqAction>669 pub fn inner(&self) -> SpinLockGuard<InnerIrqAction> {
670 self.inner.lock_irqsave()
671 }
672
thread_completion(&self) -> &Completion673 pub fn thread_completion(&self) -> &Completion {
674 &self.thread_completion
675 }
676 }
677
678 #[allow(dead_code)]
679 #[derive(Debug)]
680 pub struct InnerIrqAction {
681 /// cookie to identify the device
682 dev_id: Option<Arc<DeviceId>>,
683 /// cookie to identify the device (per cpu)
684 per_cpu_dev_id: Option<PerCpuVar<Arc<DeviceId>>>,
685 /// 中断处理程序
686 handler: Option<&'static dyn IrqHandler>,
687 /// interrupt handler function for threaded interrupts
688 thread_fn: Option<&'static dyn IrqHandler>,
689 /// thread pointer for threaded interrupts
690 thread: Option<Arc<ProcessControlBlock>>,
691 /// pointer to secondary irqaction (force threading)
692 secondary: Option<Arc<IrqAction>>,
693 /// 中断号
694 irq: IrqNumber,
695 flags: IrqHandleFlags,
696 /// 中断线程的标志
697 thread_flags: ThreadedHandlerFlags,
698 /// name of the device
699 name: String,
700 }
701
702 impl InnerIrqAction {
dev_id(&self) -> &Option<Arc<DeviceId>>703 pub fn dev_id(&self) -> &Option<Arc<DeviceId>> {
704 &self.dev_id
705 }
706
dev_id_mut(&mut self) -> &mut Option<Arc<DeviceId>>707 pub fn dev_id_mut(&mut self) -> &mut Option<Arc<DeviceId>> {
708 &mut self.dev_id
709 }
710
per_cpu_dev_id(&self) -> Option<&Arc<DeviceId>>711 pub fn per_cpu_dev_id(&self) -> Option<&Arc<DeviceId>> {
712 self.per_cpu_dev_id.as_ref().map(|v| v.get())
713 }
714
715 #[allow(dead_code)]
per_cpu_dev_id_mut(&mut self) -> Option<&mut Arc<DeviceId>>716 pub fn per_cpu_dev_id_mut(&mut self) -> Option<&mut Arc<DeviceId>> {
717 self.per_cpu_dev_id.as_mut().map(|v| v.get_mut())
718 }
719
handler(&self) -> Option<&'static dyn IrqHandler>720 pub fn handler(&self) -> Option<&'static dyn IrqHandler> {
721 self.handler
722 }
723
set_handler(&mut self, handler: Option<&'static dyn IrqHandler>)724 pub fn set_handler(&mut self, handler: Option<&'static dyn IrqHandler>) {
725 self.handler = handler;
726 }
727
thread_fn(&self) -> Option<&'static dyn IrqHandler>728 pub fn thread_fn(&self) -> Option<&'static dyn IrqHandler> {
729 self.thread_fn
730 }
731
thread(&self) -> Option<Arc<ProcessControlBlock>>732 pub fn thread(&self) -> Option<Arc<ProcessControlBlock>> {
733 self.thread.clone()
734 }
735
set_thread(&mut self, thread: Option<Arc<ProcessControlBlock>>)736 pub fn set_thread(&mut self, thread: Option<Arc<ProcessControlBlock>>) {
737 self.thread = thread;
738 }
739
740 #[allow(dead_code)]
thread_flags(&self) -> &ThreadedHandlerFlags741 pub fn thread_flags(&self) -> &ThreadedHandlerFlags {
742 &self.thread_flags
743 }
744
thread_flags_mut(&mut self) -> &mut ThreadedHandlerFlags745 pub fn thread_flags_mut(&mut self) -> &mut ThreadedHandlerFlags {
746 &mut self.thread_flags
747 }
748
secondary(&self) -> Option<Arc<IrqAction>>749 pub fn secondary(&self) -> Option<Arc<IrqAction>> {
750 self.secondary.clone()
751 }
752
753 #[allow(dead_code)]
irq(&self) -> IrqNumber754 pub fn irq(&self) -> IrqNumber {
755 self.irq
756 }
757
758 #[allow(dead_code)]
set_irq(&mut self, irq: IrqNumber)759 pub fn set_irq(&mut self, irq: IrqNumber) {
760 self.irq = irq;
761 }
762
flags(&self) -> &IrqHandleFlags763 pub fn flags(&self) -> &IrqHandleFlags {
764 &self.flags
765 }
766
flags_mut(&mut self) -> &mut IrqHandleFlags767 pub fn flags_mut(&mut self) -> &mut IrqHandleFlags {
768 &mut self.flags
769 }
770
name(&self) -> &String771 pub fn name(&self) -> &String {
772 &self.name
773 }
774 }
775
776 bitflags! {
777 /// 这些标志由线程处理程序使用
778 pub struct ThreadedHandlerFlags: u32 {
779 /// IRQTF_RUNTHREAD - 表示应运行中断处理程序线程
780 const IRQTF_RUNTHREAD = 1 << 0;
781 /// IRQTF_WARNED - 已打印警告 "IRQ_WAKE_THREAD w/o thread_fn"
782 const IRQTF_WARNED = 1 << 1;
783 /// IRQTF_AFFINITY - 请求irq线程调整亲和性
784 const IRQTF_AFFINITY = 1 << 2;
785 /// IRQTF_FORCED_THREAD - irq操作被强制线程化
786 const IRQTF_FORCED_THREAD = 1 << 3;
787 /// IRQTF_READY - 表示irq线程已准备就绪
788 const IRQTF_READY = 1 << 4;
789 }
790 }
791
792 /// Implements the `ThreadedHandlerFlags` structure.
793 impl ThreadedHandlerFlags {
794 /// 在 `ThreadedHandlerFlags` 结构中测试并设置特定的位。
795 ///
796 /// # 参数
797 ///
798 /// * `bit` - 要测试并设置的位。
799 ///
800 /// # 返回
801 ///
802 /// 如果操作前该位已被设置，则返回 `true`，否则返回 `false`。
test_and_set_bit(&mut self, bit: ThreadedHandlerFlags) -> bool803 pub fn test_and_set_bit(&mut self, bit: ThreadedHandlerFlags) -> bool {
804 let res = (self.bits & bit.bits) != 0;
805 self.bits |= bit.bits;
806 return res;
807 }
808 }
809
810 // 定义IrqFlags位标志
811
812 bitflags! {
813 /// 这些标志仅由内核在中断处理例程中使用。
814 #[allow(clippy::bad_bit_mask)]
815 pub struct IrqHandleFlags: u32 {
816
817 const IRQF_TRIGGER_NONE = IrqLineStatus::IRQ_TYPE_NONE.bits();
818 const IRQF_TRIGGER_RISING = IrqLineStatus::IRQ_TYPE_EDGE_RISING.bits();
819 const IRQF_TRIGGER_FALLING = IrqLineStatus::IRQ_TYPE_EDGE_FALLING.bits();
820 const IRQF_TRIGGER_HIGH = IrqLineStatus::IRQ_TYPE_LEVEL_HIGH.bits();
821 const IRQF_TRIGGER_LOW = IrqLineStatus::IRQ_TYPE_LEVEL_LOW.bits();
822 const IRQF_TRIGGER_MASK = Self::IRQF_TRIGGER_HIGH.bits | Self::IRQF_TRIGGER_LOW.bits | Self::IRQF_TRIGGER_RISING.bits | Self::IRQF_TRIGGER_FALLING.bits;
823 /// IRQF_SHARED - 允许多个设备共享中断
824 const IRQF_SHARED = 0x00000080;
825 /// IRQF_PROBE_SHARED - 当预期出现共享不匹配时，由调用者设置
826 const IRQF_PROBE_SHARED = 0x00000100;
827 /// IRQF_TIMER - 标记此中断为定时器中断
828 const __IRQF_TIMER = 0x00000200;
829 /// IRQF_PERCPU - 中断是每个CPU的
830 const IRQF_PERCPU = 0x00000400;
831 /// IRQF_NOBALANCING - 将此中断从中断平衡中排除
832 const IRQF_NOBALANCING = 0x00000800;
833 /// IRQF_IRQPOLL - 中断用于轮询（出于性能原因，只有在共享中断中首次注册的中断会被考虑）
834 const IRQF_IRQPOLL = 0x00001000;
835 /// IRQF_ONESHOT - 在硬中断处理程序完成后，不会重新启用中断。由需要在运行线程处理程序之前保持中断线路禁用的线程中断使用。
836 const IRQF_ONESHOT = 0x00002000;
837 /// IRQF_NO_SUSPEND - 在挂起期间不禁用此IRQ。不能保证此中断会从挂起状态唤醒系统。
838 const IRQF_NO_SUSPEND = 0x00004000;
839 /// IRQF_FORCE_RESUME - 即使设置了IRQF_NO_SUSPEND，也强制在恢复时启用它
840 const IRQF_FORCE_RESUME = 0x00008000;
841 /// IRQF_NO_THREAD - 中断不能被线程化
842 const IRQF_NO_THREAD = 0x00010000;
843 /// IRQF_EARLY_RESUME - 在syscore而不是在设备恢复时间早期恢复IRQ。
844 const IRQF_EARLY_RESUME = 0x00020000;
845 /// IRQF_COND_SUSPEND - 如果IRQ与NO_SUSPEND用户共享，则在挂起中断后执行此中断处理程序。对于系统唤醒设备用户，需要在他们的中断处理程序中实现唤醒检测。
846 const IRQF_COND_SUSPEND = 0x00040000;
847 /// IRQF_NO_AUTOEN - 当用户请求时，不会自动启用IRQ或NMI。用户稍后会通过enable_irq()或enable_nmi()显式启用它。
848 const IRQF_NO_AUTOEN = 0x00080000;
849 /// IRQF_NO_DEBUG - 从IPI和类似处理程序的逃逸检测中排除，取决于IRQF_PERCPU。
850 const IRQF_NO_DEBUG = 0x00100000;
851 const IRQF_TIMER = Self::__IRQF_TIMER.bits | Self::IRQF_NO_SUSPEND.bits | Self::IRQF_NO_THREAD.bits;
852 }
853 }
854
855 impl IrqHandleFlags {
856 /// 检查是否指定了触发类型
857 #[inline(always)]
trigger_type_specified(&self) -> bool858 pub fn trigger_type_specified(&self) -> bool {
859 (self.bits & Self::IRQF_TRIGGER_MASK.bits) != 0
860 }
861
862 /// 插入触发类型
insert_trigger_type(&mut self, trigger: IrqLineStatus)863 pub fn insert_trigger_type(&mut self, trigger: IrqLineStatus) {
864 self.bits |= trigger.trigger_bits() & IrqHandleFlags::IRQF_TRIGGER_MASK.bits;
865 }
866
867 #[allow(dead_code)]
remove_trigger_type(&mut self, trigger: IrqLineStatus)868 pub fn remove_trigger_type(&mut self, trigger: IrqLineStatus) {
869 self.bits &= !(trigger.trigger_bits() & IrqHandleFlags::IRQF_TRIGGER_MASK.bits);
870 }
871
trigger_type(&self) -> IrqLineStatus872 pub fn trigger_type(&self) -> IrqLineStatus {
873 IrqLineStatus::from_bits_truncate(self.bits & IrqHandleFlags::IRQF_TRIGGER_MASK.bits)
874 }
875 }
876
877 #[inline(never)]
early_irq_init() -> Result<(), SystemError>878 pub(super) fn early_irq_init() -> Result<(), SystemError> {
879 let irqcnt = CurrentIrqArch::probe_total_irq_num();
880 let mut manager = IrqDescManager::new();
881 for i in 0..irqcnt {
882 let irq_desc = IrqDesc::new(IrqNumber::new(i), None, IrqStatus::empty());
883 manager.insert(IrqNumber::new(i), irq_desc);
884 }
885
886 unsafe {
887 IRQ_DESC_MANAGER = Some(manager);
888 }
889
890 return CurrentIrqArch::arch_early_irq_init();
891 }
892
893 static mut IRQ_DESC_MANAGER: Option<IrqDescManager> = None;
894
895 /// 获取中断描述符管理器的引用
896 #[inline(always)]
irq_desc_manager() -> &'static IrqDescManager897 pub fn irq_desc_manager() -> &'static IrqDescManager {
898 return unsafe { IRQ_DESC_MANAGER.as_ref().unwrap() };
899 }
900
901 pub struct IrqDescManager {
902 irq_descs: BTreeMap<IrqNumber, Arc<IrqDesc>>,
903 }
904
905 impl IrqDescManager {
new() -> Self906 fn new() -> Self {
907 IrqDescManager {
908 irq_descs: BTreeMap::new(),
909 }
910 }
911
912 /// 查找中断描述符
lookup(&self, irq: IrqNumber) -> Option<Arc<IrqDesc>>913 pub fn lookup(&self, irq: IrqNumber) -> Option<Arc<IrqDesc>> {
914 self.irq_descs.get(&irq).cloned()
915 }
916
917 /// 查找中断描述符并锁定总线(没有对irqdesc进行加锁)
918 #[allow(dead_code)]
lookup_and_lock_bus( &self, irq: IrqNumber, check_global: bool, check_percpu: bool, ) -> Option<Arc<IrqDesc>>919 pub fn lookup_and_lock_bus(
920 &self,
921 irq: IrqNumber,
922 check_global: bool,
923 check_percpu: bool,
924 ) -> Option<Arc<IrqDesc>> {
925 self.do_lookup_and_lock(irq, true, check_global, check_percpu)
926 }
927
do_lookup_and_lock( &self, irq: IrqNumber, lock_bus: bool, check_global: bool, check_percpu: bool, ) -> Option<Arc<IrqDesc>>928 fn do_lookup_and_lock(
929 &self,
930 irq: IrqNumber,
931 lock_bus: bool,
932 check_global: bool,
933 check_percpu: bool,
934 ) -> Option<Arc<IrqDesc>> {
935 let desc = self.lookup(irq)?;
936 if check_global || check_percpu {
937 if check_percpu && !desc.inner().line_status().is_per_cpu_devid() {
938 return None;
939 }
940
941 if check_global && desc.inner().line_status().is_per_cpu_devid() {
942 return None;
943 }
944 }
945
946 if lock_bus {
947 desc.chip_bus_lock();
948 }
949
950 return Some(desc);
951 }
952
insert(&mut self, irq: IrqNumber, desc: Arc<IrqDesc>)953 fn insert(&mut self, irq: IrqNumber, desc: Arc<IrqDesc>) {
954 self.irq_descs.insert(irq, desc);
955 }
956
957 /// 释放中断描述符
958 #[allow(dead_code)]
free_desc(&mut self, irq: IrqNumber)959 fn free_desc(&mut self, irq: IrqNumber) {
960 if let Some(desc) = self.irq_descs.get(&irq) {
961 irq_sysfs_del(desc);
962 self.irq_descs.remove(&irq);
963 }
964 }
965
966 /// 迭代中断描述符
iter_descs(&self) -> btree_map::Iter<'_, IrqNumber, Arc<IrqDesc>>967 pub fn iter_descs(&self) -> btree_map::Iter<'_, IrqNumber, Arc<IrqDesc>> {
968 self.irq_descs.iter()
969 }
970
971 /// 设置指定irq的可用cpu为所有cpu
set_percpu_devid_all(&self, irq: IrqNumber) -> Result<(), SystemError>972 pub fn set_percpu_devid_all(&self, irq: IrqNumber) -> Result<(), SystemError> {
973 self.set_percpu_devid(irq, None)
974 }
975
976 /// 设置指定irq的可用cpu
977 ///
978 /// 如果affinity为None，则表示设置为所有cpu
set_percpu_devid( &self, irq: IrqNumber, affinity: Option<&CpuMask>, ) -> Result<(), SystemError>979 pub fn set_percpu_devid(
980 &self,
981 irq: IrqNumber,
982 affinity: Option<&CpuMask>,
983 ) -> Result<(), SystemError> {
984 let desc = self.lookup(irq).ok_or(SystemError::EINVAL)?;
985 let mut desc_inner = desc.inner();
986
987 if desc_inner.percpu_enabled().is_some() {
988 return Err(SystemError::EINVAL);
989 }
990
991 *desc_inner.percpu_enabled_mut() = Some(CpuMask::new());
992
993 if let Some(affinity) = affinity {
994 desc_inner.percpu_affinity_mut().replace(affinity.clone());
995 } else {
996 desc_inner
997 .percpu_affinity_mut()
998 .replace(smp_cpu_manager().possible_cpus().clone());
999 }
1000
1001 drop(desc_inner);
1002
1003 desc.set_percpu_devid_flags();
1004
1005 return Ok(());
1006 }
1007 }
1008
1009 pub struct GenericIrqHandler;
1010
1011 #[allow(dead_code)]
1012 impl GenericIrqHandler {
1013 /// `handle_domain_irq` - 调用属于某个中断域的硬件中断的处理程序
1014 ///
1015 /// # 参数
1016 ///
1017 /// * `domain`: 执行查找的域
1018 /// * `hwirq`: 要转换为逻辑中断的硬件中断号
1019 ///
1020 /// # 返回
1021 ///
1022 /// 成功时返回 `Ok(())`，如果转换失败则返回 `Err(SystemError)`
1023 ///
1024 /// 此函数必须在初始化了中断寄存器的中断上下文中调用
1025 ///
1026 /// 参考 https://code.dragonos.org.cn/xref/linux-6.6.21/kernel/irq/irqdesc.c?fi=generic_handle_domain_irq#726
handle_domain_irq( domain: Arc<IrqDomain>, hwirq: HardwareIrqNumber, trap_frame: &mut TrapFrame, ) -> Result<(), SystemError>1027 pub fn handle_domain_irq(
1028 domain: Arc<IrqDomain>,
1029 hwirq: HardwareIrqNumber,
1030 trap_frame: &mut TrapFrame,
1031 ) -> Result<(), SystemError> {
1032 let (irq_desc, _) =
1033 irq_domain_manager().resolve_irq_mapping(Some(domain.clone()), hwirq)?;
1034
1035 irq_desc.handler().unwrap().handle(&irq_desc, trap_frame);
1036
1037 return Ok(());
1038 }
1039 }
1040