arch/powerpc/sysdev/mpic_msi.c

Source file repositories/reference/linux-study-clean/arch/powerpc/sysdev/mpic_msi.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/sysdev/mpic_msi.c
Extension
.c
Size
2352 bytes
Lines
100
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source 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

while (of_irq_parse_one(np, index++, &oirq) == 0) {
			ops->xlate(mpic->irqhost, NULL, oirq.args,
						oirq.args_count, &hwirq, &flags);
			msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
		}
	}

	return 0;
}
#else
static int __init mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
{
	return -1;
}
#endif

int __init mpic_msi_init_allocator(struct mpic *mpic)
{
	int rc;

	rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources,
			      irq_domain_get_of_node(mpic->irqhost));
	if (rc)
		return rc;

	rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
	if (rc > 0) {
		if (mpic->flags & MPIC_U3_HT_IRQS)
			rc = mpic_msi_reserve_u3_hwirqs(mpic);

		if (rc) {
			msi_bitmap_free(&mpic->msi_bitmap);
			return rc;
		}
	}

	return 0;
}

Annotation

Implementation Notes