From 8570f04ce9233f8512089185e1c5a095bd2bbaff Mon Sep 17 00:00:00 2001 From: liaocj Date: Fri, 22 Nov 2024 12:01:11 +0800 Subject: [PATCH] Update submodules --- ...rq\347\232\204\346\230\240\345\260\204.md" | 24 ---- ...55\345\217\267\346\230\240\345\260\204.md" | 107 +++++++++++++++++- ...344\270\255\346\226\255--net_rx_action.md" | 2 +- 3 files changed, 107 insertions(+), 26 deletions(-) delete mode 100755 "linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--hwirq\345\222\214irq\347\232\204\346\230\240\345\260\204.md" diff --git "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--hwirq\345\222\214irq\347\232\204\346\230\240\345\260\204.md" "b/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--hwirq\345\222\214irq\347\232\204\346\230\240\345\260\204.md" deleted file mode 100755 index 6b28d1f..0000000 --- "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--hwirq\345\222\214irq\347\232\204\346\230\240\345\260\204.md" +++ /dev/null @@ -1,24 +0,0 @@ -```c -int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq, - int node, const struct irq_affinity_desc *affinity) -{ - unsigned int hint; - - if (virq >= 0) { - virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE, - affinity); - } else { - hint = hwirq % nr_irqs; - if (hint == 0) - hint++; - virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE, - affinity); - if (virq <= 0 && hint > 1) { - virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE, - affinity); - } - } - - return virq; -} -``` \ No newline at end of file diff --git "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--\344\270\255\346\226\255\345\217\267\346\230\240\345\260\204.md" "b/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--\344\270\255\346\226\255\345\217\267\346\230\240\345\260\204.md" index a38b002..6da97f3 100755 --- "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--\344\270\255\346\226\255\345\217\267\346\230\240\345\260\204.md" +++ "b/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\347\241\254\344\270\255\346\226\255--\344\270\255\346\226\255\345\217\267\346\230\240\345\260\204.md" @@ -1 +1,106 @@ -# hwirq 和 irq 的映射 \ No newline at end of file +# hwirq 和 irq 的映射 +```c +int irq_domain_alloc_descs(int virq, unsigned int cnt, irq_hw_number_t hwirq, + int node, const struct irq_affinity_desc *affinity) +{ + unsigned int hint; + + if (virq >= 0) { + virq = __irq_alloc_descs(virq, virq, cnt, node, THIS_MODULE, + affinity); + } else { + hint = hwirq % nr_irqs; + if (hint == 0) + hint++; + virq = __irq_alloc_descs(-1, hint, cnt, node, THIS_MODULE, + affinity); + if (virq <= 0 && hint > 1) { + virq = __irq_alloc_descs(-1, 1, cnt, node, THIS_MODULE, + affinity); + } + } + + return virq; +} + +/** + * __irq_domain_alloc_irqs - Allocate IRQs from domain + * @domain: domain to allocate from + * @irq_base: allocate specified IRQ number if irq_base >= 0 + * @nr_irqs: number of IRQs to allocate + * @node: NUMA node id for memory allocation + * @arg: domain specific argument + * @realloc: IRQ descriptors have already been allocated if true + * @affinity: Optional irq affinity mask for multiqueue devices + * + * Allocate IRQ numbers and initialized all data structures to support + * hierarchy IRQ domains. + * Parameter @realloc is mainly to support legacy IRQs. + * Returns error code or allocated IRQ number + * + * The whole process to setup an IRQ has been split into two steps. + * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ + * descriptor and required hardware resources. The second step, + * irq_domain_activate_irq(), is to program the hardware with preallocated + * resources. In this way, it's easier to rollback when failing to + * allocate resources. + */ +int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, + unsigned int nr_irqs, int node, void *arg, + bool realloc, const struct irq_affinity_desc *affinity) +{ + int i, ret, virq; + + if (domain == NULL) { + domain = irq_default_domain; + if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n")) + return -EINVAL; + } + + if (realloc && irq_base >= 0) { + virq = irq_base; + } else { + virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node, + affinity); + if (virq < 0) { + pr_debug("cannot allocate IRQ(base %d, count %d)\n", + irq_base, nr_irqs); + return virq; + } + } + + if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { + pr_debug("cannot allocate memory for IRQ%d\n", virq); + ret = -ENOMEM; + goto out_free_desc; + } + + mutex_lock(&irq_domain_mutex); + ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg); + if (ret < 0) { + mutex_unlock(&irq_domain_mutex); + goto out_free_irq_data; + } + + for (i = 0; i < nr_irqs; i++) { + ret = irq_domain_trim_hierarchy(virq + i); + if (ret) { + mutex_unlock(&irq_domain_mutex); + goto out_free_irq_data; + } + } + + for (i = 0; i < nr_irqs; i++) + irq_domain_insert_irq(virq + i); + mutex_unlock(&irq_domain_mutex); + + return virq; + +out_free_irq_data: + irq_domain_free_irq_data(virq, nr_irqs); +out_free_desc: + irq_free_descs(virq, nr_irqs); + return ret; +} + +``` \ No newline at end of file diff --git "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\350\275\257\344\270\255\346\226\255--net_rx_action.md" "b/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\350\275\257\344\270\255\346\226\255--net_rx_action.md" index 5072728..1bed90f 100755 --- "a/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\350\275\257\344\270\255\346\226\255--net_rx_action.md" +++ "b/linux/\345\206\205\346\240\270-\351\251\261\345\212\250/\344\270\255\346\226\255/\350\275\257\344\270\255\346\226\255--net_rx_action.md" @@ -38,7 +38,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h) */ if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit))) { - sd->time_squeeze++; //记录由于预算或时间限制而中断处理的次数,用于统计和诊断，帮助分析软中断处理是否经常受到限制，以便进行优化，通过cat /proc/net/softnet_stat 查看 + sd->time_squeeze++; //记录由于预算或时间限制而中断处理的次数,用于统计和诊断，帮助分析软中断处理是否经常受到限制， 以便进行优化，通过cat /proc/net/softnet_stat 查看 break; } }