Update submodules

linux/内核-驱动/中断/内核preempt.md

@@ -88,3 +88,4 @@ static __always_inline int preempt_count(void)
 }
 ```
 ![alt text](../../../../medias/images_0/内核preempt_image-1.png)
+![alt text](../../../../medias/images_0/内核preempt_image-2.png)

linux/内核-驱动/中断/硬中断--irq_domain的初始化.md

@@ -1,6 +1,8 @@
 
 ```c
-[__gic_init_bases() -> irq_domain_add_linear() -> __irq_domain_add()]
+# x86 初始化
+对于x86来说__irq_domain_add在arch_early_irq_init中调用
+## 初始化核心函数
 [kernel/irq/irqdomain.c]
 struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
 				    irq_hw_number_t hwirq_max, int direct_max,
@@ -31,12 +33,27 @@ struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
 }
 EXPORT_SYMBOL_GPL(__irq_domain_add);
 ```
-# x86 初始化
+
+domain->ops  为：
+```c
+static const struct irq_domain_ops x86_vector_domain_ops = {
+	.select		= x86_vector_select,
+	.alloc		= x86_vector_alloc_irqs,
+	.free		= x86_vector_free_irqs,
+	.activate	= x86_vector_activate,
+	.deactivate	= x86_vector_deactivate,
+#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+	.debug_show	= x86_vector_debug_show,
+#endif
+};
+```
+
+## 调用堆栈
 ```c
 [    0.000000]  dump_stack_lvl+0x45/0x63
 [    0.000000]  dump_stack+0x10/0x12
 [    0.000000]  __irq_domain_add+0x1a8/0x290
-[    0.000000]  ? __irq_domain_alloc_fwnode+0xb9/0xf0
+[    0.000000]  irq_domain_create_tree+0xb9/0xf0
 [    0.000000]  arch_early_irq_init+0x3a/0x79
 [    0.000000]  early_irq_init+0xe5/0xec
 [    0.000000]  start_kernel+0x449/0x661

linux/内核-驱动/中断/硬中断--中断号映射.md

@@ -189,14 +189,14 @@ unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
 	}
 
 	/* Allocate a virtual interrupt number */
-    //映射的核心函数，内部调用__irq_domain_alloc_irqs()函数
 	virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
 				      affinity);
 	if (virq <= 0) {
 		pr_debug("-> virq allocation failed\n");
 		return 0;
 	}
 
+    //映射的核心函数，内部调用__irq_domain_alloc_irqs()函数
 	if (irq_domain_associate(domain, virq, hwirq)) {
 		irq_free_desc(virq);
 		return 0;
@@ -263,6 +263,7 @@ int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
 	}
 
 	domain->mapcount++;
+    // 根据hwirq反向索引到irq_data
 	irq_domain_set_mapping(domain, hwirq, irq_data);
 	mutex_unlock(&irq_domain_mutex);
 

linux/内核-驱动/中断/硬中断--初始化.md

@@ -77,4 +77,40 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
     desc_smp_init(desc, node);
 }
 
+static const struct irq_domain_ops x86_vector_domain_ops = {
+	.select		= x86_vector_select,
+	.alloc		= x86_vector_alloc_irqs,
+	.free		= x86_vector_free_irqs,
+	.activate	= x86_vector_activate,
+	.deactivate	= x86_vector_deactivate,
+#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+	.debug_show	= x86_vector_debug_show,
+#endif
+};
+
+//根据x86_vector_domain_ops 初始化domain_ops
+int __init arch_early_irq_init(void)
+{
+	struct fwnode_handle *fn;
+
+	fn = irq_domain_alloc_named_fwnode("VECTOR");
+	BUG_ON(!fn);
+	x86_vector_domain = irq_domain_create_tree(fn, &x86_vector_domain_ops,
+						   NULL);
+	BUG_ON(x86_vector_domain == NULL);
+	irq_set_default_host(x86_vector_domain);
+
+	BUG_ON(!alloc_cpumask_var(&vector_searchmask, GFP_KERNEL));
+
+	/*
+	 * Allocate the vector matrix allocator data structure and limit the
+	 * search area.
+	 */
+	vector_matrix = irq_alloc_matrix(NR_VECTORS, FIRST_EXTERNAL_VECTOR,
+					 FIRST_SYSTEM_VECTOR);
+	BUG_ON(!vector_matrix);
+
+	return arch_early_ioapic_init();
+}
+
 ```

linux/内核-驱动/中断/硬中断--硬中断号的解析.md

@@ -0,0 +1,33 @@
+irq_of_parse_and_map
+irq_create_of_mapping
+```c
+struct of_phandle_args {
+	struct device_node *np;
+	int args_count;
+	uint32_t args[MAX_PHANDLE_ARGS];
+};
+
+static void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
+				      unsigned int count,
+				      struct irq_fwspec *fwspec)
+{
+	int i;
+
+	fwspec->fwnode = of_node_to_fwnode(np);
+	fwspec->param_count = count;
+
+	for (i = 0; i < count; i++)
+		fwspec->param[i] = args[i];
+}
+
+unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
+{
+	struct irq_fwspec fwspec;
+
+	of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
+				  irq_data->args_count, &fwspec);
+
+	return irq_create_fwspec_mapping(&fwspec);
+}
+EXPORT_SYMBOL_GPL(irq_create_of_mapping);
+```