1 use core::ops::{BitXor, Deref, DerefMut}; 2 3 use alloc::{string::String, sync::Arc}; 4 5 use system_error::SystemError; 6 7 use crate::{ 8 driver::base::device::DeviceId, 9 exception::{ 10 irqchip::IrqChipSetMaskResult, 11 irqdesc::{irq_desc_manager, InnerIrqDesc, IrqAction}, 12 }, 13 libs::{cpumask::CpuMask, spinlock::SpinLockGuard}, 14 process::{kthread::KernelThreadMechanism, ProcessManager}, 15 smp::cpu::ProcessorId, 16 }; 17 18 use super::{ 19 dummychip::no_irq_chip, 20 irqchip::IrqChipFlags, 21 irqdata::{IrqData, IrqHandlerData, IrqLineStatus, IrqStatus}, 22 irqdesc::{InnerIrqAction, IrqDesc, IrqDescState, IrqHandleFlags, IrqHandler, IrqReturn}, 23 irqdomain::irq_domain_manager, 24 IrqNumber, 25 }; 26 27 lazy_static! { 28 /// 默认的中断亲和性 29 static ref IRQ_DEFAULT_AFFINITY: CpuMask = { 30 let mut mask = CpuMask::new(); 31 // 默认情况下，中断处理程序将在第一个处理器上运行 32 mask.set(ProcessorId::new(0), true); 33 mask 34 }; 35 } 36 37 pub fn irq_manager() -> &'static IrqManager { 38 &IrqManager 39 } 40 41 /// 中断管理器 42 pub struct IrqManager; 43 44 impl IrqManager { 45 pub const IRQ_RESEND: bool = true; 46 #[allow(dead_code)] 47 pub const IRQ_NORESEND: bool = false; 48 #[allow(dead_code)] 49 pub const IRQ_START_FORCE: bool = true; 50 pub const IRQ_START_COND: bool = false; 51 52 /// 在中断线上添加一个处理函数 53 /// 54 /// ## 参数 55 /// 56 /// - irq: 虚拟中断号(中断线号) 57 /// - name: 生成该中断的设备名称 58 /// - handler: 中断处理函数 59 /// - flags: 中断处理标志 60 /// - dev_id: 一个用于标识设备的cookie 61 pub fn request_irq( 62 &self, 63 irq: IrqNumber, 64 name: String, 65 handler: &'static dyn IrqHandler, 66 flags: IrqHandleFlags, 67 dev_id: Option<Arc<DeviceId>>, 68 ) -> Result<(), SystemError> { 69 return self.request_threaded_irq(irq, Some(handler), None, flags, name, dev_id); 70 } 71 72 /// 在中断线上添加一个处理函数（可以是线程化的中断） 73 /// 74 /// ## 参数 75 /// 76 /// - irq: 虚拟中断号 77 /// - handler: 当中断发生时将被调用的函数，是 78 /// 线程化中断的初级处理程序。如果handler为`None`并且thread_fn不为`None`， 79 /// 将安装默认的初级处理程序 80 /// - thread_fn: 在中断处理程序线程中调用的函数. 如果为`None`，则不会创建irq线程 81 /// - flags: 中断处理标志 82 /// - IRQF_SHARED: 中断是共享的 83 /// - IRQF_TRIGGER*: 指定中断触发方式 84 /// - IRQF_ONESHOT: 在thread_fn中运行时，中断线被遮蔽 85 /// - dev_name: 生成该中断的设备名称 86 /// - dev_id: 一个用于标识设备的cookie 87 /// 88 /// ## 说明 89 /// 90 /// 此调用分配中断资源并启用中断线和IRQ处理。 91 /// 从这一点开始，您的处理程序函数可能会被调用。 92 /// 因此，您必须确保首先初始化您的硬件， 93 /// 并确保以正确的顺序设置中断处理程序。 94 /// 95 /// 如果您想为您的设备设置线程化中断处理程序 96 /// 则需要提供@handler和@thread_fn。@handler仍然 97 /// 在硬中断上下文中调用，并且必须检查 98 /// 中断是否来自设备。如果是，它需要禁用设备上的中断 99 /// 并返回IRQ_WAKE_THREAD，这将唤醒处理程序线程并运行 100 /// @thread_fn。这种拆分处理程序设计是为了支持 101 /// 共享中断。 102 /// 103 /// dev_id必须是全局唯一的。通常使用设备数据结构的地址或者uuid 104 /// 作为cookie。由于处理程序接收这个值，因此使用它是有意义的。 105 /// 106 /// 如果您的中断是共享的，您必须传递一个非NULL的dev_id 107 /// 因为当释放中断时需要它。 108 pub fn request_threaded_irq( 109 &self, 110 irq: IrqNumber, 111 mut handler: Option<&'static dyn IrqHandler>, 112 thread_fn: Option<&'static dyn IrqHandler>, 113 flags: IrqHandleFlags, 114 dev_name: String, 115 dev_id: Option<Arc<DeviceId>>, 116 ) -> Result<(), SystemError> { 117 if irq == IrqNumber::IRQ_NOTCONNECTED { 118 return Err(SystemError::ENOTCONN); 119 } 120 121 // 逻辑检查：共享中断必须传入一个真正的设备ID， 122 // 否则后来我们将难以确定哪个中断是哪个（会搞乱中断释放逻辑等）。 123 // 此外，共享中断与禁用自动使能不相符。 共享中断可能在仍然禁用时请求它，然后永远等待中断。 124 // 另外，IRQF_COND_SUSPEND 仅适用于共享中断，并且它不能与 IRQF_NO_SUSPEND 同时设置。 125 126 if ((flags.contains(IrqHandleFlags::IRQF_SHARED)) && dev_id.is_none()) 127 || ((flags.contains(IrqHandleFlags::IRQF_SHARED)) 128 && (flags.contains(IrqHandleFlags::IRQF_NO_AUTOEN))) 129 || (!(flags.contains(IrqHandleFlags::IRQF_SHARED)) 130 && (flags.contains(IrqHandleFlags::IRQF_COND_SUSPEND))) 131 || ((flags.contains(IrqHandleFlags::IRQF_NO_SUSPEND)) 132 && (flags.contains(IrqHandleFlags::IRQF_COND_SUSPEND))) 133 { 134 return Err(SystemError::EINVAL); 135 } 136 let desc = irq_desc_manager().lookup(irq).ok_or(SystemError::EINVAL)?; 137 if !desc.can_request() { 138 kwarn!("desc {} can not request", desc.irq().data()); 139 return Err(SystemError::EINVAL); 140 } 141 142 if handler.is_none() { 143 if thread_fn.is_none() { 144 // 不允许中断处理函数和线程处理函数都为空 145 return Err(SystemError::EINVAL); 146 } 147 148 // 如果中断处理函数为空，线程处理函数不为空，则使用默认的中断处理函数 149 handler = Some(&DefaultPrimaryIrqHandler); 150 } 151 152 let irqaction = IrqAction::new(irq, dev_name, handler, thread_fn); 153 154 let mut action_guard = irqaction.inner(); 155 *action_guard.flags_mut() = flags; 156 *action_guard.dev_id_mut() = dev_id; 157 drop(action_guard); 158 159 return self.inner_setup_irq(irq, irqaction, desc); 160 } 161 162 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/manage.c?r=&mo=59252&fi=2138#1497 163 #[inline(never)] 164 fn inner_setup_irq( 165 &self, 166 irq: IrqNumber, 167 action: Arc<IrqAction>, 168 desc: Arc<IrqDesc>, 169 ) -> Result<(), SystemError> { 170 // ==== 定义错误处理函数 ==== 171 let err_out_thread = 172 |e: SystemError, mut action_guard: SpinLockGuard<'_, InnerIrqAction>| -> SystemError { 173 if let Some(thread_pcb) = action_guard.thread() { 174 action_guard.set_thread(None); 175 KernelThreadMechanism::stop(&thread_pcb).ok(); 176 } 177 178 if let Some(secondary) = action_guard.secondary() { 179 let mut secondary_guard = secondary.inner(); 180 if let Some(thread_pcb) = secondary_guard.thread() { 181 secondary_guard.set_thread(None); 182 KernelThreadMechanism::stop(&thread_pcb).ok(); 183 } 184 } 185 return e; 186 }; 187 188 let err_out_bus_unlock = |e: SystemError, 189 desc: Arc<IrqDesc>, 190 req_mutex_guard: crate::libs::mutex::MutexGuard<'_, ()>, 191 action_guard: SpinLockGuard<'_, InnerIrqAction>| 192 -> SystemError { 193 desc.chip_bus_sync_unlock(); 194 drop(req_mutex_guard); 195 return err_out_thread(e, action_guard); 196 }; 197 198 let err_out_unlock = |e: SystemError, 199 desc_guard: SpinLockGuard<'_, InnerIrqDesc>, 200 desc: Arc<IrqDesc>, 201 req_mutex_guard: crate::libs::mutex::MutexGuard<'_, ()>, 202 action_guard: SpinLockGuard<'_, InnerIrqAction>| 203 -> SystemError { 204 drop(desc_guard); 205 return err_out_bus_unlock(e, desc, req_mutex_guard, action_guard); 206 }; 207 208 let err_out_mismatch = |old_action_guard: SpinLockGuard<'_, InnerIrqAction>, 209 desc_guard: SpinLockGuard<'_, InnerIrqDesc>, 210 action_guard: SpinLockGuard<'_, InnerIrqAction>, 211 desc: Arc<IrqDesc>, 212 req_mutex_guard: crate::libs::mutex::MutexGuard<'_, ()>| 213 -> SystemError { 214 if !action_guard 215 .flags() 216 .contains(IrqHandleFlags::IRQF_PROBE_SHARED) 217 { 218 kerror!("Flags mismatch for irq {} (name: {}, flags: {:?}). old action name: {}, old flags: {:?}", irq.data(), action_guard.name(), action_guard.flags(), old_action_guard.name(), old_action_guard.flags()); 219 } 220 return err_out_unlock( 221 SystemError::EBUSY, 222 desc_guard, 223 desc, 224 req_mutex_guard, 225 action_guard, 226 ); 227 }; 228 229 // ===== 代码开始 ===== 230 231 if Arc::ptr_eq( 232 &desc.irq_data().chip_info_read_irqsave().chip(), 233 &no_irq_chip(), 234 ) { 235 return Err(SystemError::ENOSYS); 236 } 237 238 let mut action_guard = action.inner(); 239 if !action_guard.flags().trigger_type_specified() { 240 // 如果没有指定触发类型，则使用默认的触发类型 241 action_guard 242 .flags_mut() 243 .insert_trigger_type(desc.irq_data().common_data().trigger_type()) 244 } 245 246 let nested = desc.nested_thread(); 247 248 if nested { 249 if action_guard.thread_fn().is_none() { 250 return Err(SystemError::EINVAL); 251 } 252 253 action_guard.set_handler(Some(&IrqNestedPrimaryHandler)); 254 } else if desc.can_thread() { 255 self.setup_forced_threading(action_guard.deref_mut())?; 256 } 257 258 // 如果具有中断线程处理程序，并且中断不是嵌套的，则设置中断线程 259 if action_guard.thread_fn().is_some() && !nested { 260 self.setup_irq_thread(irq, action_guard.deref(), false)?; 261 262 if let Some(secondary) = action_guard.secondary() { 263 let secondary_guard = secondary.inner(); 264 if let Err(e) = self.setup_irq_thread(irq, secondary_guard.deref(), true) { 265 return Err(err_out_thread(e, action_guard)); 266 } 267 } 268 } 269 270 // Drivers are often written to work w/o knowledge about the 271 // underlying irq chip implementation, so a request for a 272 // threaded irq without a primary hard irq context handler 273 // requires the ONESHOT flag to be set. Some irq chips like 274 // MSI based interrupts are per se one shot safe. Check the 275 // chip flags, so we can avoid the unmask dance at the end of 276 // the threaded handler for those. 277 278 if desc 279 .irq_data() 280 .chip_info_read_irqsave() 281 .chip() 282 .flags() 283 .contains(IrqChipFlags::IRQCHIP_ONESHOT_SAFE) 284 { 285 *action_guard.flags_mut() &= !IrqHandleFlags::IRQF_ONESHOT; 286 } 287 288 // Protects against a concurrent __free_irq() call which might wait 289 // for synchronize_hardirq() to complete without holding the optional 290 // chip bus lock and desc->lock. Also protects against handing out 291 // a recycled oneshot thread_mask bit while it's still in use by 292 // its previous owner. 293 let req_mutex_guard = desc.request_mutex_lock(); 294 295 // Acquire bus lock as the irq_request_resources() callback below 296 // might rely on the serialization or the magic power management 297 // functions which are abusing the irq_bus_lock() callback, 298 desc.chip_bus_lock(); 299 300 // 如果当前中断线上还没有irqaction, 则先为中断线申请资源 301 if desc.actions().is_empty() { 302 if let Err(e) = self.irq_request_resources(desc.clone()) { 303 kerror!( 304 "Failed to request resources for {} (irq {}) on irqchip {}, error {:?}", 305 action_guard.name(), 306 irq.data(), 307 desc.irq_data().chip_info_read_irqsave().chip().name(), 308 e 309 ); 310 return Err(err_out_bus_unlock( 311 e, 312 desc.clone(), 313 req_mutex_guard, 314 action_guard, 315 )); 316 } 317 } 318 319 let mut desc_inner_guard: SpinLockGuard<'_, InnerIrqDesc> = desc.inner(); 320 321 // 标记当前irq是否是共享的 322 let mut irq_shared = false; 323 if !desc_inner_guard.actions().is_empty() { 324 // 除非双方都同意并且是相同类型（级别、边沿、极性），否则不能共享中断。 325 // 因此，两个标志字段都必须设置IRQF_SHARED，并且设置触发类型的位必须匹配。 326 // 另外，所有各方都必须就ONESHOT达成一致。 327 // NMI用途的中断线不能共享。 328 if desc_inner_guard 329 .internal_state() 330 .contains(IrqDescState::IRQS_NMI) 331 { 332 kerror!( 333 "Invalid attempt to share NMI for {} (irq {}) on irqchip {}", 334 action_guard.name(), 335 irq.data(), 336 desc_inner_guard 337 .irq_data() 338 .chip_info_read_irqsave() 339 .chip() 340 .name() 341 ); 342 return Err(err_out_unlock( 343 SystemError::EINVAL, 344 desc_inner_guard, 345 desc.clone(), 346 req_mutex_guard, 347 action_guard, 348 )); 349 } 350 351 let irq_data = desc_inner_guard.irq_data(); 352 353 let old_trigger_type: super::irqdata::IrqLineStatus; 354 let status = irq_data.common_data().status(); 355 if status.trigger_type_was_set() { 356 old_trigger_type = status.trigger_type(); 357 } else { 358 old_trigger_type = action_guard.flags().trigger_type(); 359 irq_data.common_data().set_trigger_type(old_trigger_type); 360 } 361 362 let old = &desc_inner_guard.actions()[0].clone(); 363 let old_guard = old.inner(); 364 365 if (!(old_guard 366 .flags() 367 .intersection(*action_guard.flags()) 368 .contains(IrqHandleFlags::IRQF_SHARED))) 369 || (old_trigger_type != (action_guard.flags().trigger_type())) 370 || ((old_guard.flags().bitxor(*action_guard.flags())) 371 .contains(IrqHandleFlags::IRQF_ONESHOT)) 372 { 373 return Err(err_out_mismatch( 374 old_guard, 375 desc_inner_guard, 376 action_guard, 377 desc.clone(), 378 req_mutex_guard, 379 )); 380 } 381 382 // all handlers must agree on per-cpuness 383 if *old_guard.flags() & IrqHandleFlags::IRQF_PERCPU 384 != *action_guard.flags() & IrqHandleFlags::IRQF_PERCPU 385 { 386 return Err(err_out_mismatch( 387 old_guard, 388 desc_inner_guard, 389 action_guard, 390 desc.clone(), 391 req_mutex_guard, 392 )); 393 } 394 395 irq_shared = true; 396 } 397 398 if action_guard.flags().contains(IrqHandleFlags::IRQF_ONESHOT) { 399 // todo: oneshot 400 } else if action_guard.handler().is_some_and(|h| { 401 h.type_id() == (&DefaultPrimaryIrqHandler as &dyn IrqHandler).type_id() 402 }) && !desc_inner_guard 403 .irq_data() 404 .chip_info_read_irqsave() 405 .chip() 406 .flags() 407 .contains(IrqChipFlags::IRQCHIP_ONESHOT_SAFE) 408 { 409 // 请求中断时 hander = NULL，因此我们为其使用默认的主处理程序。 410 // 但它没有设置ONESHOT标志。与电平触发中断结合时， 411 // 这是致命的，因为默认的主处理程序只是唤醒线程，然后重新启用 irq 线路， 412 // 但设备仍然保持电平中断生效。周而复始.... 413 // 虽然这对于边缘类型中断来说可行，但我们为了安全起见，不加条件地拒绝， 414 // 因为我们不能确定这个中断实际上具有什么类型。 415 // 由于底层芯片实现可能会覆盖它们，所以类型标志并不可靠. 416 417 kerror!( 418 "Requesting irq {} without a handler, and ONESHOT flags not set for irqaction: {}", 419 irq.data(), 420 action_guard.name() 421 ); 422 return Err(err_out_unlock( 423 SystemError::EINVAL, 424 desc_inner_guard, 425 desc.clone(), 426 req_mutex_guard, 427 action_guard, 428 )); 429 } 430 431 // 第一次在当前irqdesc上注册中断处理函数 432 if !irq_shared { 433 // 设置中断触发方式 434 if action_guard.flags().trigger_type_specified() { 435 let trigger_type = action_guard.flags().trigger_type(); 436 if let Err(e) = 437 self.do_set_irq_trigger(desc.clone(), &mut desc_inner_guard, trigger_type) 438 { 439 return Err(err_out_unlock( 440 e, 441 desc_inner_guard, 442 desc.clone(), 443 req_mutex_guard, 444 action_guard, 445 )); 446 } 447 } 448 449 // 激活中断。这种激活必须独立于IRQ_NOAUTOEN进行*desc_inner_guard.internal_state_mut() |= IrqDescState::IRQS_NOREQUEST;uest. 450 if let Err(e) = self.irq_activate(&desc, &mut desc_inner_guard) { 451 return Err(err_out_unlock( 452 e, 453 desc_inner_guard, 454 desc.clone(), 455 req_mutex_guard, 456 action_guard, 457 )); 458 } 459 460 *desc_inner_guard.internal_state_mut() &= !(IrqDescState::IRQS_AUTODETECT 461 | IrqDescState::IRQS_SPURIOUS_DISABLED 462 | IrqDescState::IRQS_ONESHOT 463 | IrqDescState::IRQS_WAITING); 464 desc_inner_guard 465 .common_data() 466 .clear_status(IrqStatus::IRQD_IRQ_INPROGRESS); 467 468 if action_guard.flags().contains(IrqHandleFlags::IRQF_PERCPU) { 469 desc_inner_guard 470 .common_data() 471 .insert_status(IrqStatus::IRQD_PER_CPU); 472 desc_inner_guard.line_status_set_per_cpu(); 473 474 if action_guard.flags().contains(IrqHandleFlags::IRQF_NO_DEBUG) { 475 desc_inner_guard.line_status_set_no_debug(); 476 } 477 } 478 479 if action_guard.flags().contains(IrqHandleFlags::IRQF_ONESHOT) { 480 *desc_inner_guard.internal_state_mut() |= IrqDescState::IRQS_ONESHOT; 481 } 482 483 // 如果有要求的话，则忽略IRQ的均衡。 484 if action_guard 485 .flags() 486 .contains(IrqHandleFlags::IRQF_NOBALANCING) 487 { 488 todo!("IRQF_NO_BALANCING"); 489 } 490 491 if !action_guard 492 .flags() 493 .contains(IrqHandleFlags::IRQF_NO_AUTOEN) 494 && desc_inner_guard.can_autoenable() 495 { 496 // 如果没有设置IRQF_NOAUTOEN，则自动使能中断 497 self.irq_startup( 498 &desc, 499 &mut desc_inner_guard, 500 Self::IRQ_RESEND, 501 Self::IRQ_START_COND, 502 ) 503 .ok(); 504 } else { 505 // 共享中断与禁用自动使能不太兼容。 506 // 共享中断可能在它仍然被禁用时请求它，然后永远等待中断。 507 508 static mut WARNED: bool = false; 509 if action_guard.flags().contains(IrqHandleFlags::IRQF_SHARED) && unsafe { !WARNED } 510 { 511 kwarn!( 512 "Shared interrupt {} for {} requested but not auto enabled", 513 irq.data(), 514 action_guard.name() 515 ); 516 unsafe { WARNED = true }; 517 } 518 519 desc_inner_guard.set_depth(1); 520 } 521 } else if action_guard.flags().trigger_type_specified() { 522 let new_trigger_type = action_guard.flags().trigger_type(); 523 let old_trigger_type = desc_inner_guard.common_data().trigger_type(); 524 if new_trigger_type != old_trigger_type { 525 kwarn!("Irq {} uses trigger type: {old_trigger_type:?}, but requested trigger type: {new_trigger_type:?}.", irq.data()); 526 } 527 } 528 529 // 在队列末尾添加新的irqaction 530 desc_inner_guard.add_action(action.clone()); 531 532 // 检查我们是否曾经通过虚构的中断处理程序禁用过irq。重新启用它并再给它一次机会。 533 if irq_shared 534 && desc_inner_guard 535 .internal_state() 536 .contains(IrqDescState::IRQS_SPURIOUS_DISABLED) 537 { 538 desc_inner_guard 539 .internal_state_mut() 540 .remove(IrqDescState::IRQS_SPURIOUS_DISABLED); 541 self.do_enable_irq(desc.clone(), &mut desc_inner_guard).ok(); 542 } 543 544 drop(desc_inner_guard); 545 desc.chip_bus_sync_unlock(); 546 drop(req_mutex_guard); 547 548 drop(action_guard); 549 self.wake_up_and_wait_for_irq_thread_ready(&desc, Some(action.clone())); 550 self.wake_up_and_wait_for_irq_thread_ready(&desc, action.inner().secondary()); 551 return Ok(()); 552 } 553 554 /// 唤醒中断线程并等待中断线程准备好 555 /// 556 /// ## 参数 557 /// 558 /// - desc: 中断描述符 559 /// - action: 要唤醒的中断处理函数 560 /// 561 /// ## 锁 562 /// 563 /// 进入当前函数时，`action`的锁需要被释放 564 fn wake_up_and_wait_for_irq_thread_ready( 565 &self, 566 desc: &Arc<IrqDesc>, 567 action: Option<Arc<IrqAction>>, 568 ) { 569 if action.is_none() { 570 return; 571 } 572 573 let action = action.unwrap(); 574 575 let action_guard = action.inner(); 576 if action_guard.thread().is_none() { 577 return; 578 } 579 580 ProcessManager::wakeup(&action_guard.thread().unwrap()).ok(); 581 drop(action_guard); 582 action 583 .thread_completion() 584 .wait_for_completion() 585 .map_err(|e| { 586 kwarn!( 587 "Failed to wait for irq thread ready for {} (irq {:?}), error {:?}", 588 action.inner().name(), 589 desc.irq_data().irq(), 590 e 591 ); 592 }) 593 .ok(); 594 } 595 596 pub(super) fn irq_activate_and_startup( 597 &self, 598 desc: &Arc<IrqDesc>, 599 desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 600 resend: bool, 601 ) -> Result<(), SystemError> { 602 self.irq_activate(desc, desc_inner_guard)?; 603 self.irq_startup(desc, desc_inner_guard, resend, Self::IRQ_START_FORCE) 604 } 605 606 pub(super) fn irq_activate( 607 &self, 608 _desc: &Arc<IrqDesc>, 609 desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 610 ) -> Result<(), SystemError> { 611 let irq_data = desc_inner_guard.irq_data(); 612 613 if !desc_inner_guard.common_data().status().affinity_managed() { 614 return irq_domain_manager().activate_irq(irq_data, false); 615 } 616 617 return Ok(()); 618 } 619 620 /// 设置CPU亲和性并开启中断 621 pub(super) fn irq_startup( 622 &self, 623 desc: &Arc<IrqDesc>, 624 desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 625 resend: bool, 626 force: bool, 627 ) -> Result<(), SystemError> { 628 let mut ret = Ok(()); 629 let irq_data = desc_inner_guard.irq_data().clone(); 630 let affinity = desc_inner_guard.common_data().affinity(); 631 desc_inner_guard.set_depth(0); 632 633 if desc_inner_guard.common_data().status().started() { 634 self.irq_enable(desc_inner_guard); 635 } else { 636 match self.__irq_startup_managed(desc_inner_guard, &affinity, force) { 637 IrqStartupResult::Normal => { 638 if irq_data 639 .chip_info_read_irqsave() 640 .chip() 641 .flags() 642 .contains(IrqChipFlags::IRQCHIP_AFFINITY_PRE_STARTUP) 643 { 644 self.irq_setup_affinity(desc, desc_inner_guard).ok(); 645 } 646 647 ret = self.__irq_startup(desc_inner_guard); 648 649 if !irq_data 650 .chip_info_read_irqsave() 651 .chip() 652 .flags() 653 .contains(IrqChipFlags::IRQCHIP_AFFINITY_PRE_STARTUP) 654 { 655 self.irq_setup_affinity(desc, desc_inner_guard).ok(); 656 } 657 } 658 IrqStartupResult::Managed => { 659 self.irq_do_set_affinity(&irq_data, desc_inner_guard, &affinity, false) 660 .ok(); 661 ret = self.__irq_startup(desc_inner_guard); 662 } 663 IrqStartupResult::Abort => { 664 desc_inner_guard 665 .common_data() 666 .insert_status(IrqStatus::IRQD_MANAGED_SHUTDOWN); 667 return Ok(()); 668 } 669 } 670 } 671 672 if resend { 673 if let Err(e) = self.irq_check_and_resend(desc_inner_guard, false) { 674 kerror!( 675 "Failed to check and resend irq {}, error {:?}", 676 irq_data.irq().data(), 677 e 678 ); 679 } 680 } 681 682 return ret; 683 } 684 685 pub fn irq_enable(&self, desc_inner_guard: &SpinLockGuard<'_, InnerIrqDesc>) { 686 let common_data = desc_inner_guard.common_data(); 687 if !common_data.status().disabled() { 688 self.unmask_irq(desc_inner_guard); 689 } else { 690 common_data.clear_disabled(); 691 692 let chip = desc_inner_guard.irq_data().chip_info_read_irqsave().chip(); 693 694 if let Err(e) = chip.irq_enable(desc_inner_guard.irq_data()) { 695 if e == SystemError::ENOSYS { 696 self.unmask_irq(desc_inner_guard); 697 } 698 kerror!( 699 "Failed to enable irq {} (name: {:?}), error {:?}", 700 desc_inner_guard.irq_data().irq().data(), 701 desc_inner_guard.name(), 702 e 703 ); 704 } else { 705 common_data.clear_masked(); 706 } 707 } 708 } 709 710 /// 自动设置中断的CPU亲和性 711 /// 712 /// 713 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/manage.c#589 714 pub fn irq_setup_affinity( 715 &self, 716 _desc: &Arc<IrqDesc>, 717 desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 718 ) -> Result<(), SystemError> { 719 let common_data = desc_inner_guard.common_data(); 720 if !desc_inner_guard.can_set_affinity() { 721 return Ok(()); 722 } 723 724 let mut to_set = IRQ_DEFAULT_AFFINITY.clone(); 725 if common_data.status().affinity_managed() 726 || common_data.status().contains(IrqStatus::IRQD_AFFINITY_SET) 727 { 728 // FIXME: 要判断affinity跟已上线的CPU是否有交集 729 730 let irq_aff = common_data.affinity(); 731 if irq_aff.is_empty() { 732 common_data.clear_status(IrqStatus::IRQD_AFFINITY_SET); 733 } else { 734 to_set = irq_aff; 735 } 736 } 737 738 // FIXME: 求to_set和在线CPU的交集 739 740 return self.irq_do_set_affinity( 741 desc_inner_guard.irq_data(), 742 desc_inner_guard, 743 &to_set, 744 false, 745 ); 746 } 747 748 pub fn irq_do_set_affinity( 749 &self, 750 irq_data: &Arc<IrqData>, 751 desc_inner_guard: &SpinLockGuard<'_, InnerIrqDesc>, 752 cpumask: &CpuMask, 753 force: bool, 754 ) -> Result<(), SystemError> { 755 let chip = irq_data.chip_info_read_irqsave().chip(); 756 if !chip.can_set_affinity() { 757 return Err(SystemError::EINVAL); 758 } 759 760 // todo: 处理CPU中断隔离相关的逻辑 761 762 let common_data = desc_inner_guard.common_data(); 763 let r = if force || !cpumask.is_empty() { 764 chip.irq_set_affinity(irq_data, cpumask, force) 765 } else { 766 return Err(SystemError::EINVAL); 767 }; 768 769 let mut ret = Ok(()); 770 if let Ok(rs) = r { 771 match rs { 772 IrqChipSetMaskResult::Success | IrqChipSetMaskResult::Done => { 773 common_data.set_affinity(cpumask.clone()); 774 } 775 IrqChipSetMaskResult::NoChange => { 776 777 // irq_validate_effective_affinity(data); 778 // irq_set_thread_affinity(desc); 779 } 780 } 781 } else { 782 ret = Err(r.unwrap_err()); 783 } 784 785 return ret; 786 } 787 788 fn __irq_startup( 789 &self, 790 desc_inner_guard: &SpinLockGuard<'_, InnerIrqDesc>, 791 ) -> Result<(), SystemError> { 792 let common_data = desc_inner_guard.common_data(); 793 794 if let Err(e) = desc_inner_guard 795 .irq_data() 796 .chip_info_read_irqsave() 797 .chip() 798 .irq_startup(desc_inner_guard.irq_data()) 799 { 800 if e == SystemError::ENOSYS { 801 self.irq_enable(desc_inner_guard); 802 } else { 803 return Err(e); 804 } 805 } else { 806 common_data.clear_disabled(); 807 common_data.clear_masked(); 808 } 809 810 common_data.set_started(); 811 812 return Ok(()); 813 } 814 815 fn __irq_startup_managed( 816 &self, 817 desc_inner_guard: &SpinLockGuard<'_, InnerIrqDesc>, 818 _affinity: &CpuMask, 819 _force: bool, 820 ) -> IrqStartupResult { 821 let irq_data = desc_inner_guard.irq_data(); 822 let common_data = desc_inner_guard.common_data(); 823 824 if !common_data.status().affinity_managed() { 825 return IrqStartupResult::Normal; 826 } 827 828 common_data.clear_managed_shutdown(); 829 830 /* 831 - 检查Affinity掩码是否包括所有的在线CPU。如果是，这意味着有代码试图在管理的中断上使用enable_irq()， 832 这可能是非法的。在这种情况下，如果force不是真值，函数会返回IRQ_STARTUP_ABORT，表示中断处理应该被放弃。 833 - 如果Affinity掩码中没有任何在线的CPU，那么中断请求是不可用的，因为没有任何CPU可以处理它。 834 在这种情况下，如果force不是真值，函数同样会返回IRQ_STARTUP_ABORT。 835 - 如果以上条件都不满足，尝试激活中断，并将其设置为管理模式。这是通过调用 `irq_domain_manager().activate_irq()` 函数来实现的。 836 如果这个调用失败，表示有保留的资源无法访问，函数会返回IRQ_STARTUP_ABORT。 837 - 如果一切顺利，函数会返回IRQ_STARTUP_MANAGED，表示中断已经被成功管理并激活。 838 */ 839 840 // if (cpumask_any_and(aff, cpu_online_mask) >= nr_cpu_ids) { 841 // /* 842 // * Catch code which fiddles with enable_irq() on a managed 843 // * and potentially shutdown IRQ. Chained interrupt 844 // * installment or irq auto probing should not happen on 845 // * managed irqs either. 846 // */ 847 // if (WARN_ON_ONCE(force)) 848 // return IRQ_STARTUP_ABORT; 849 // /* 850 // * The interrupt was requested, but there is no online CPU 851 // * in it's affinity mask. Put it into managed shutdown 852 // * state and let the cpu hotplug mechanism start it up once 853 // * a CPU in the mask becomes available. 854 // */ 855 // return IRQ_STARTUP_ABORT; 856 // } 857 858 let r = irq_domain_manager().activate_irq(irq_data, false); 859 if r.is_err() { 860 return IrqStartupResult::Abort; 861 } 862 863 return IrqStartupResult::Managed; 864 } 865 866 pub fn do_enable_irq( 867 &self, 868 _desc: Arc<IrqDesc>, 869 _desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 870 ) -> Result<(), SystemError> { 871 // https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/manage.c?r=&mo=59252&fi=2138#776 872 todo!("do_enable_irq") 873 } 874 875 #[inline(never)] 876 pub fn do_set_irq_trigger( 877 &self, 878 _desc: Arc<IrqDesc>, 879 desc_inner_guard: &mut SpinLockGuard<'_, InnerIrqDesc>, 880 mut trigger_type: IrqLineStatus, 881 ) -> Result<(), SystemError> { 882 let chip = desc_inner_guard.irq_data().chip_info_read_irqsave().chip(); 883 let mut to_unmask = false; 884 885 if !chip.can_set_flow_type() { 886 // kdebug!( 887 // "No set_irq_type function for irq {}, chip {}", 888 // desc_inner_guard.irq_data().irq().data(), 889 // chip.name() 890 // ); 891 return Ok(()); 892 } 893 894 if chip.flags().contains(IrqChipFlags::IRQCHIP_SET_TYPE_MASKED) { 895 if !desc_inner_guard.common_data().status().masked() { 896 self.mask_irq(desc_inner_guard.irq_data()); 897 } 898 if !desc_inner_guard.common_data().status().disabled() { 899 to_unmask = true; 900 } 901 } 902 903 trigger_type &= IrqLineStatus::IRQ_TYPE_SENSE_MASK; 904 905 let r = chip.irq_set_type(desc_inner_guard.irq_data(), trigger_type); 906 let ret; 907 if let Ok(rs) = r { 908 match rs { 909 IrqChipSetMaskResult::Success | IrqChipSetMaskResult::Done => { 910 let common_data = desc_inner_guard.common_data(); 911 common_data.clear_status(IrqStatus::IRQD_TRIGGER_MASK); 912 let mut irqstatus = IrqStatus::empty(); 913 irqstatus.set_trigger_type(trigger_type); 914 common_data.insert_status(irqstatus); 915 } 916 IrqChipSetMaskResult::NoChange => { 917 let flags = desc_inner_guard.common_data().trigger_type(); 918 desc_inner_guard.set_trigger_type(flags); 919 desc_inner_guard 920 .common_data() 921 .clear_status(IrqStatus::IRQD_LEVEL); 922 desc_inner_guard.clear_level(); 923 924 if !(flags & IrqLineStatus::IRQ_TYPE_LEVEL_MASK).is_empty() { 925 desc_inner_guard.set_level(); 926 desc_inner_guard 927 .common_data() 928 .insert_status(IrqStatus::IRQD_LEVEL); 929 } 930 } 931 } 932 933 ret = Ok(()); 934 } else { 935 kerror!( 936 "Failed to set irq {} trigger type to {:?} on irqchip {}, error {:?}", 937 desc_inner_guard.irq_data().irq().data(), 938 trigger_type, 939 chip.name(), 940 r 941 ); 942 943 ret = Err(r.unwrap_err()); 944 } 945 946 if to_unmask { 947 self.unmask_irq(desc_inner_guard); 948 } 949 return ret; 950 } 951 952 fn irq_request_resources(&self, desc: Arc<IrqDesc>) -> Result<(), SystemError> { 953 let irq_data = desc.irq_data(); 954 let irq_chip = irq_data.chip_info_read_irqsave().chip(); 955 irq_chip.irq_request_resources(&irq_data) 956 } 957 958 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/manage.c?r=&mo=59252&fi=2138#1448 959 fn setup_irq_thread( 960 &self, 961 _irq: IrqNumber, 962 _action: &InnerIrqAction, 963 _secondary: bool, 964 ) -> Result<(), SystemError> { 965 // if secondary { 966 // KernelThreadMechanism::create(func, name) 967 // } 968 969 todo!("setup_irq_thread") 970 } 971 972 fn setup_forced_threading(&self, _action: &mut InnerIrqAction) -> Result<(), SystemError> { 973 // todo: 处理强制线程化的逻辑，参考linux的`irq_setup_forced_threading()` 974 return Ok(()); 975 } 976 977 pub fn irq_clear_status_flags( 978 &self, 979 irq: IrqNumber, 980 status: IrqLineStatus, 981 ) -> Result<(), SystemError> { 982 let desc = irq_desc_manager().lookup(irq).ok_or(SystemError::EINVAL)?; 983 desc.modify_status(status, IrqLineStatus::empty()); 984 return Ok(()); 985 } 986 987 /// 屏蔽中断 988 pub(super) fn mask_irq(&self, irq_data: &Arc<IrqData>) { 989 if irq_data.common_data().status().masked() { 990 return; 991 } 992 993 let chip = irq_data.chip_info_read_irqsave().chip(); 994 let r = chip.irq_mask(irq_data); 995 996 if r.is_ok() { 997 irq_data.common_data().set_masked(); 998 } 999 } 1000 1001 /// 解除屏蔽中断 1002 pub(super) fn unmask_irq(&self, desc_inner_guard: &SpinLockGuard<'_, InnerIrqDesc>) { 1003 if !desc_inner_guard.common_data().status().masked() { 1004 return; 1005 } 1006 1007 let r = desc_inner_guard 1008 .irq_data() 1009 .chip_info_read_irqsave() 1010 .chip() 1011 .irq_unmask(desc_inner_guard.irq_data()); 1012 1013 if let Err(e) = r { 1014 if e != SystemError::ENOSYS { 1015 kerror!( 1016 "Failed to unmask irq {} on irqchip {}, error {:?}", 1017 desc_inner_guard.irq_data().irq().data(), 1018 desc_inner_guard 1019 .irq_data() 1020 .chip_info_read_irqsave() 1021 .chip() 1022 .name(), 1023 e 1024 ); 1025 } 1026 } else { 1027 desc_inner_guard 1028 .common_data() 1029 .clear_status(IrqStatus::IRQD_IRQ_MASKED); 1030 } 1031 } 1032 1033 /// 释放使用request_irq分配的中断 1034 /// 1035 /// ## 参数 1036 /// 1037 /// - irq: 要释放的中断线 1038 /// - dev_id: 要释放的设备身份 1039 /// 1040 /// ## 返回 1041 /// 1042 /// 返回传递给request_irq的devname参数 1043 /// 1044 /// ## 说明 1045 /// 1046 /// 移除一个中断处理程序。处理程序被移除，如果该中断线不再被任何驱动程序使用，则会被禁用。 1047 /// 1048 /// 在共享IRQ的情况下，调用者必须确保在调用此功能之前，它在所驱动的卡上禁用了中断。 1049 /// 1050 /// ## 注意 1051 /// 1052 /// 此函数不可以在中断上下文中调用。 1053 pub fn free_irq(&self, _irq: IrqNumber, _dev_id: Option<Arc<DeviceId>>) { 1054 kwarn!("Unimplemented free_irq"); 1055 } 1056 } 1057 1058 enum IrqStartupResult { 1059 Normal, 1060 Managed, 1061 Abort, 1062 } 1063 /// 默认的初级中断处理函数 1064 /// 1065 /// 该处理函数仅仅返回`WakeThread`，即唤醒中断线程 1066 #[derive(Debug)] 1067 struct DefaultPrimaryIrqHandler; 1068 1069 impl IrqHandler for DefaultPrimaryIrqHandler { 1070 fn handle( 1071 &self, 1072 _irq: IrqNumber, 1073 _static_data: Option<&dyn IrqHandlerData>, 1074 _dynamic_data: Option<Arc<dyn IrqHandlerData>>, 1075 ) -> Result<IrqReturn, SystemError> { 1076 return Ok(IrqReturn::WakeThread); 1077 } 1078 } 1079 1080 /// Primary handler for nested threaded interrupts. 1081 /// Should never be called. 1082 #[derive(Debug)] 1083 struct IrqNestedPrimaryHandler; 1084 1085 impl IrqHandler for IrqNestedPrimaryHandler { 1086 fn handle( 1087 &self, 1088 irq: IrqNumber, 1089 _static_data: Option<&dyn IrqHandlerData>, 1090 _dynamic_data: Option<Arc<dyn IrqHandlerData>>, 1091 ) -> Result<IrqReturn, SystemError> { 1092 kwarn!("Primary handler called for nested irq {}", irq.data()); 1093 return Ok(IrqReturn::NotHandled); 1094 } 1095 } 1096