arch/x86/platform/uv/uv_irq.c

Source file repositories/reference/linux-study-clean/arch/x86/platform/uv/uv_irq.c

File Facts

System
Linux kernel
Corpus path
arch/x86/platform/uv/uv_irq.c
Extension
.c
Size
5557 bytes
Lines
214
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct uv_irq_2_mmr_pnode {
	unsigned long		offset;
	int			pnode;
};

static void uv_program_mmr(struct irq_cfg *cfg, struct uv_irq_2_mmr_pnode *info)
{
	unsigned long mmr_value;
	struct uv_IO_APIC_route_entry *entry;

	BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
		     sizeof(unsigned long));

	mmr_value = 0;
	entry = (struct uv_IO_APIC_route_entry *)&mmr_value;
	entry->vector		= cfg->vector;
	entry->delivery_mode	= APIC_DELIVERY_MODE_FIXED;
	entry->dest_mode	= apic->dest_mode_logical;
	entry->polarity		= 0;
	entry->trigger		= 0;
	entry->mask		= 0;
	entry->dest		= cfg->dest_apicid;

	uv_write_global_mmr64(info->pnode, info->offset, mmr_value);
}

static void uv_noop(struct irq_data *data) { }

static int
uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
		    bool force)
{
	struct irq_data *parent = data->parent_data;
	struct irq_cfg *cfg = irqd_cfg(data);
	int ret;

	ret = parent->chip->irq_set_affinity(parent, mask, force);
	if (ret >= 0) {
		uv_program_mmr(cfg, data->chip_data);
		vector_schedule_cleanup(cfg);
	}

	return ret;
}

static struct irq_chip uv_irq_chip = {
	.name			= "UV-CORE",
	.irq_mask		= uv_noop,
	.irq_unmask		= uv_noop,
	.irq_eoi		= apic_ack_irq,
	.irq_set_affinity	= uv_set_irq_affinity,
};

static int uv_domain_alloc(struct irq_domain *domain, unsigned int virq,
			   unsigned int nr_irqs, void *arg)
{
	struct uv_irq_2_mmr_pnode *chip_data;
	struct irq_alloc_info *info = arg;
	struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
	int ret;

	if (nr_irqs > 1 || !info || info->type != X86_IRQ_ALLOC_TYPE_UV)
		return -EINVAL;

	chip_data = kmalloc_node(sizeof(*chip_data), GFP_KERNEL,
				 irq_data_get_node(irq_data));
	if (!chip_data)
		return -ENOMEM;

	ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
	if (ret >= 0) {
		if (info->uv.limit == UV_AFFINITY_CPU)
			irq_set_status_flags(virq, IRQ_NO_BALANCING);

		chip_data->pnode = uv_blade_to_pnode(info->uv.blade);
		chip_data->offset = info->uv.offset;
		irq_domain_set_info(domain, virq, virq, &uv_irq_chip, chip_data,
				    handle_percpu_irq, NULL, info->uv.name);
	} else {
		kfree(chip_data);
	}

	return ret;
}

static void uv_domain_free(struct irq_domain *domain, unsigned int virq,
			   unsigned int nr_irqs)
{
	struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);

Annotation

Implementation Notes