xref: /DragonOS/kernel/src/exception/sysfs.rs (revision b2ca6800f9d943e5d3656d9b50a099da768775a7) 
1 use alloc::{string::ToString, sync::Arc};
2 use system_error::SystemError;
3 use unified_init::macros::unified_init;
4 
5 use crate::{
6     driver::base::{
7         kobject::{KObjType, KObject, KObjectManager, KObjectSysFSOps},
8         kset::KSet,
9     },
10     filesystem::{
11         sysfs::{
12             file::sysfs_emit_str, Attribute, AttributeGroup, SysFSOps, SysFSOpsSupport,
13             SYSFS_ATTR_MODE_RO,
14         },
15         vfs::syscall::ModeType,
16     },
17     init::initcall::INITCALL_POSTCORE,
18     misc::ksysfs::sys_kernel_kset,
19 };
20 
21 use super::{
22     irqdesc::{irq_desc_manager, IrqDesc},
23     IrqNumber,
24 };
25 
26 /// `/sys/kernel/irq`的kset
27 static mut SYS_KERNEL_IRQ_KSET_INSTANCE: Option<Arc<KSet>> = None;
28 
29 #[inline(always)]
30 #[allow(dead_code)]
31 pub fn sys_kernel_irq_kset() -> Arc<KSet> {
32     unsafe { SYS_KERNEL_IRQ_KSET_INSTANCE.clone().unwrap() }
33 }
34 
35 /// 中断描述符的kobjtype
36 ///
37 /// https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/irqdesc.c#280
38 #[derive(Debug)]
39 pub(super) struct IrqKObjType;
40 
41 impl KObjType for IrqKObjType {
42     fn sysfs_ops(&self) -> Option<&dyn SysFSOps> {
43         Some(&KObjectSysFSOps)
44     }
45 
46     fn attribute_groups(&self) -> Option<&'static [&'static dyn AttributeGroup]> {
47         Some(&[&IrqAttrGroup])
48     }
49 
50     fn release(&self, _kobj: Arc<dyn KObject>) {
51 
52         // https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/irqdesc.c#428
53     }
54 }
55 
56 #[derive(Debug)]
57 struct IrqAttrGroup;
58 
59 impl AttributeGroup for IrqAttrGroup {
60     fn name(&self) -> Option<&str> {
61         None
62     }
63 
64     /// 所有的属性
65     ///
66     /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/irqdesc.c#268
67     fn attrs(&self) -> &[&'static dyn Attribute] {
68         // 每个irq的属性
69         // todo: 添加per_cpu_count属性
70         &[
71             &AttrChipName,
72             &AttrHardwareIrq,
73             &AttrType,
74             &AttrWakeup,
75             &AttrName,
76             &AttrActions,
77         ]
78     }
79 
80     fn is_visible(
81         &self,
82         _kobj: Arc<dyn KObject>,
83         attr: &'static dyn Attribute,
84     ) -> Option<ModeType> {
85         Some(attr.mode())
86     }
87 }
88 
89 /// 初始化irq模块在sysfs中的目录
90 ///
91 /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/kernel/irq/irqdesc.c#313
92 #[unified_init(INITCALL_POSTCORE)]
93 fn irq_sysfs_init() -> Result<(), SystemError> {
94     // todo!("irq_sysfs_init");
95 
96     let irq_kset = KSet::new("irq".to_string());
97     irq_kset
98         .register(Some(sys_kernel_kset()))
99         .expect("register irq kset failed");
100     unsafe {
101         SYS_KERNEL_IRQ_KSET_INSTANCE = Some(irq_kset);
102     }
103 
104     // 把所有的irq都注册到/sys/kernel/irq下
105     for (irq, desc) in irq_desc_manager().iter_descs() {
106         irq_sysfs_add(irq, desc);
107     }
108 
109     return Ok(());
110 }
111 
112 /// 把irqdesc添加到sysfs
113 fn irq_sysfs_add(irq: &IrqNumber, desc: &Arc<IrqDesc>) {
114     if unsafe { SYS_KERNEL_IRQ_KSET_INSTANCE.is_none() } {
115         return;
116     }
117 
118     let kset = sys_kernel_irq_kset();
119     KObjectManager::add_kobj(desc.clone() as Arc<dyn KObject>, Some(kset)).unwrap_or_else(|e| {
120         kwarn!("Failed to add irq({irq:?}) kobject to sysfs: {:?}", e);
121     });
122 
123     desc.mark_in_sysfs();
124 }
125 
126 /// 从sysfs中删除irqdesc
127 #[allow(dead_code)]
128 pub(super) fn irq_sysfs_del(desc: &Arc<IrqDesc>) {
129     if desc.in_sysfs() {
130         KObjectManager::remove_kobj(desc.clone() as Arc<dyn KObject>);
131         desc.mark_not_in_sysfs();
132     }
133 }
134 #[derive(Debug)]
135 struct AttrChipName;
136 
137 impl Attribute for AttrChipName {
138     fn name(&self) -> &str {
139         "chip_name"
140     }
141 
142     fn mode(&self) -> ModeType {
143         SYSFS_ATTR_MODE_RO
144     }
145 
146     fn support(&self) -> SysFSOpsSupport {
147         SysFSOpsSupport::ATTR_SHOW
148     }
149 
150     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
151         let irq_desc = kobj
152             .arc_any()
153             .downcast::<IrqDesc>()
154             .map_err(|_| SystemError::EINVAL)?;
155         let chip = irq_desc.irq_data().chip();
156         let name = chip.name();
157         let len = core::cmp::min(name.len() + 1, buf.len());
158         let name = format!("{}\n", name);
159         buf[..len].copy_from_slice(name.as_bytes());
160         return Ok(len);
161     }
162 }
163 
164 #[derive(Debug)]
165 struct AttrHardwareIrq;
166 
167 impl Attribute for AttrHardwareIrq {
168     fn name(&self) -> &str {
169         "hwirq"
170     }
171 
172     fn mode(&self) -> ModeType {
173         SYSFS_ATTR_MODE_RO
174     }
175 
176     fn support(&self) -> SysFSOpsSupport {
177         SysFSOpsSupport::ATTR_SHOW
178     }
179 
180     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
181         let irq_desc = kobj
182             .arc_any()
183             .downcast::<IrqDesc>()
184             .map_err(|_| SystemError::EINVAL)?;
185         let hwirq = irq_desc.hardware_irq();
186         return sysfs_emit_str(buf, &format!("{}\n", hwirq.data()));
187     }
188 }
189 
190 #[derive(Debug)]
191 struct AttrType;
192 
193 impl Attribute for AttrType {
194     fn name(&self) -> &str {
195         "type"
196     }
197 
198     fn mode(&self) -> ModeType {
199         SYSFS_ATTR_MODE_RO
200     }
201 
202     fn support(&self) -> SysFSOpsSupport {
203         SysFSOpsSupport::ATTR_SHOW
204     }
205 
206     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
207         let irq_desc = kobj
208             .arc_any()
209             .downcast::<IrqDesc>()
210             .map_err(|_| SystemError::EINVAL)?;
211         let irq_type = if irq_desc.irq_data().is_level_type() {
212             "level"
213         } else {
214             "edge"
215         };
216 
217         return sysfs_emit_str(buf, &format!("{}\n", irq_type));
218     }
219 }
220 
221 #[derive(Debug)]
222 struct AttrWakeup;
223 
224 impl Attribute for AttrWakeup {
225     fn name(&self) -> &str {
226         "wakeup"
227     }
228 
229     fn mode(&self) -> ModeType {
230         SYSFS_ATTR_MODE_RO
231     }
232 
233     fn support(&self) -> SysFSOpsSupport {
234         SysFSOpsSupport::ATTR_SHOW
235     }
236 
237     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
238         let irq_desc = kobj
239             .arc_any()
240             .downcast::<IrqDesc>()
241             .map_err(|_| SystemError::EINVAL)?;
242         let wakeup = irq_desc.irq_data().is_wakeup_set();
243         return sysfs_emit_str(buf, &format!("{}\n", wakeup));
244     }
245 }
246 
247 #[derive(Debug)]
248 struct AttrName;
249 
250 impl Attribute for AttrName {
251     fn name(&self) -> &str {
252         "name"
253     }
254 
255     fn mode(&self) -> ModeType {
256         SYSFS_ATTR_MODE_RO
257     }
258 
259     fn support(&self) -> SysFSOpsSupport {
260         SysFSOpsSupport::ATTR_SHOW
261     }
262 
263     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
264         let irq_desc = kobj
265             .arc_any()
266             .downcast::<IrqDesc>()
267             .map_err(|_| SystemError::EINVAL)?;
268 
269         if let Some(name) = irq_desc.name() {
270             return sysfs_emit_str(buf, &format!("{}\n", name));
271         }
272 
273         return Ok(0);
274     }
275 }
276 
277 #[derive(Debug)]
278 struct AttrActions;
279 
280 impl Attribute for AttrActions {
281     fn name(&self) -> &str {
282         "actions"
283     }
284 
285     fn mode(&self) -> ModeType {
286         SYSFS_ATTR_MODE_RO
287     }
288 
289     fn support(&self) -> SysFSOpsSupport {
290         SysFSOpsSupport::ATTR_SHOW
291     }
292 
293     fn show(&self, kobj: Arc<dyn KObject>, buf: &mut [u8]) -> Result<usize, SystemError> {
294         let irq_desc = kobj
295             .arc_any()
296             .downcast::<IrqDesc>()
297             .map_err(|_| SystemError::EINVAL)?;
298 
299         let actions = irq_desc.actions();
300         let mut len = 0;
301 
302         for action in actions {
303             if len != 0 {
304                 len += sysfs_emit_str(&mut buf[len..], &format!(",{}", action.name())).unwrap();
305             } else {
306                 len += sysfs_emit_str(&mut buf[len..], &format!("{}", action.name())).unwrap();
307             }
308 
309             if len >= buf.len() {
310                 break;
311             }
312         }
313 
314         if len != 0 && len < buf.len() {
315             len += sysfs_emit_str(&mut buf[len..], "\n").unwrap();
316         }
317 
318         return Ok(len);
319     }
320 }
321