5f19f14fed
At present reserving the IRLs in the IRQ bitmap in addition to the dropping of the legacy IRQ pre-allocation prevent IRL IRQs from being allocated for the x3proto board. The only reason to permit reservations was to lock down possible hardware vectors prior to dynamic IRQ scanning, but this doesn't matter much given that the hardware controller configuration is sorted before we get around to doing any dynamic IRQ allocation anyways. Beyond that, all of the tables are __init annotated, so quite a bit more work would need to be done to support reconfiguring things like IRL controllers on the fly, much more than would ever make it worth the hassle. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* Dynamic IRQ management
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*
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* Copyright (C) 2010 Paul Mundt
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*
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* Modelled after arch/x86/kernel/apic/io_apic.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#define pr_fmt(fmt) "intc: " fmt
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#include <linux/irq.h>
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#include <linux/bitmap.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include "internals.h" /* only for activate_irq() damage.. */
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/*
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* The IRQ bitmap provides a global map of bound IRQ vectors for a
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* given platform. Allocation of IRQs are either static through the CPU
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* vector map, or dynamic in the case of board mux vectors or MSI.
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*
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* As this is a central point for all IRQ controllers on the system,
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* each of the available sources are mapped out here. This combined with
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* sparseirq makes it quite trivial to keep the vector map tightly packed
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* when dynamically creating IRQs, as well as tying in to otherwise
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* unused irq_desc positions in the sparse array.
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*/
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/*
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* Dynamic IRQ allocation and deallocation
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*/
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unsigned int create_irq_nr(unsigned int irq_want, int node)
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{
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int irq = irq_alloc_desc_at(irq_want, node);
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if (irq < 0)
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return 0;
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activate_irq(irq);
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return irq;
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}
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int create_irq(void)
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{
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int irq = irq_alloc_desc(numa_node_id());
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if (irq >= 0)
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activate_irq(irq);
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return irq;
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}
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void destroy_irq(unsigned int irq)
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{
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irq_free_desc(irq);
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}
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