/* * NUMA irq-desc migration code * * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to * the new "home node" of the IRQ. */ #include <linux/irq.h> #include <linux/module.h> #include <linux/random.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include "internals.h" static void init_copy_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc, int node, int nr) { init_kstat_irqs(desc, node, nr); if (desc->kstat_irqs != old_desc->kstat_irqs) memcpy(desc->kstat_irqs, old_desc->kstat_irqs, nr * sizeof(*desc->kstat_irqs)); } static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc) { if (old_desc->kstat_irqs == desc->kstat_irqs) return; kfree(old_desc->kstat_irqs); old_desc->kstat_irqs = NULL; } static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc, struct irq_desc *desc, int node) { memcpy(desc, old_desc, sizeof(struct irq_desc)); if (!alloc_desc_masks(desc, node, false)) { printk(KERN_ERR "irq %d: can not get new irq_desc cpumask " "for migration.\n", irq); return false; } spin_lock_init(&desc->lock); desc->node = node; lockdep_set_class(&desc->lock, &irq_desc_lock_class); init_copy_kstat_irqs(old_desc, desc, node, nr_cpu_ids); init_copy_desc_masks(old_desc, desc); arch_init_copy_chip_data(old_desc, desc, node); return true; } static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc) { free_kstat_irqs(old_desc, desc); free_desc_masks(old_desc, desc); arch_free_chip_data(old_desc, desc); } static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc, int node) { struct irq_desc *desc; unsigned int irq; unsigned long flags; irq = old_desc->irq; spin_lock_irqsave(&sparse_irq_lock, flags); /* We have to check it to avoid races with another CPU */ desc = irq_desc_ptrs[irq]; if (desc && old_desc != desc) goto out_unlock; desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node); if (!desc) { printk(KERN_ERR "irq %d: can not get new irq_desc " "for migration.\n", irq); /* still use old one */ desc = old_desc; goto out_unlock; } if (!init_copy_one_irq_desc(irq, old_desc, desc, node)) { /* still use old one */ kfree(desc); desc = old_desc; goto out_unlock; } irq_desc_ptrs[irq] = desc; spin_unlock_irqrestore(&sparse_irq_lock, flags); /* free the old one */ free_one_irq_desc(old_desc, desc); kfree(old_desc); return desc; out_unlock: spin_unlock_irqrestore(&sparse_irq_lock, flags); return desc; } struct irq_desc *move_irq_desc(struct irq_desc *desc, int node) { /* those all static, do move them */ if (desc->irq < NR_IRQS_LEGACY) return desc; if (desc->node != node) desc = __real_move_irq_desc(desc, node); return desc; }