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3b5cc09033
Current assign_irq_vector() will panic if interrupt vectors is running out. But I think how to handle the case of lack of interrupt vectors should be handled by the caller of this function. For example, some PCI devices can raise the interrupt signal via both MSI and I/O APIC. So even if the driver for these device fails to allocate a vector for MSI, the driver still has a chance to use I/O APIC based interrupt. But currently there is no chance for these driver to use I/O APIC based interrupt because kernel will panic when assign_irq_vector() fails to allocate interrupt vector. The following patch changes assign_irq_vector() for ia64 to return -ENOSPC on error instead of panic (as i386 and x86_64 versions do). Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
#ifndef _ASM_IA64_HW_IRQ_H
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#define _ASM_IA64_HW_IRQ_H
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/*
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* Copyright (C) 2001-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/profile.h>
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#include <asm/machvec.h>
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#include <asm/ptrace.h>
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#include <asm/smp.h>
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typedef u8 ia64_vector;
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/*
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* 0 special
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*
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* 1,3-14 are reserved from firmware
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*
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* 16-255 (vectored external interrupts) are available
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*
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* 15 spurious interrupt (see IVR)
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*
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* 16 lowest priority, 255 highest priority
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*
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* 15 classes of 16 interrupts each.
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*/
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#define IA64_MIN_VECTORED_IRQ 16
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#define IA64_MAX_VECTORED_IRQ 255
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#define IA64_NUM_VECTORS 256
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#define AUTO_ASSIGN -1
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#define IA64_SPURIOUS_INT_VECTOR 0x0f
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/*
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* Vectors 0x10-0x1f are used for low priority interrupts, e.g. CMCI.
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*/
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#define IA64_CPEP_VECTOR 0x1c /* corrected platform error polling vector */
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#define IA64_CMCP_VECTOR 0x1d /* corrected machine-check polling vector */
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#define IA64_CPE_VECTOR 0x1e /* corrected platform error interrupt vector */
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#define IA64_CMC_VECTOR 0x1f /* corrected machine-check interrupt vector */
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/*
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* Vectors 0x20-0x2f are reserved for legacy ISA IRQs.
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*/
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#define IA64_FIRST_DEVICE_VECTOR 0x30
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#define IA64_LAST_DEVICE_VECTOR 0xe7
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#define IA64_NUM_DEVICE_VECTORS (IA64_LAST_DEVICE_VECTOR - IA64_FIRST_DEVICE_VECTOR + 1)
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#define IA64_MCA_RENDEZ_VECTOR 0xe8 /* MCA rendez interrupt */
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#define IA64_PERFMON_VECTOR 0xee /* performanc monitor interrupt vector */
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#define IA64_TIMER_VECTOR 0xef /* use highest-prio group 15 interrupt for timer */
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#define IA64_MCA_WAKEUP_VECTOR 0xf0 /* MCA wakeup (must be >MCA_RENDEZ_VECTOR) */
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#define IA64_IPI_RESCHEDULE 0xfd /* SMP reschedule */
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#define IA64_IPI_VECTOR 0xfe /* inter-processor interrupt vector */
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/* Used for encoding redirected irqs */
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#define IA64_IRQ_REDIRECTED (1 << 31)
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/* IA64 inter-cpu interrupt related definitions */
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#define IA64_IPI_DEFAULT_BASE_ADDR 0xfee00000
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/* Delivery modes for inter-cpu interrupts */
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enum {
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IA64_IPI_DM_INT = 0x0, /* pend an external interrupt */
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IA64_IPI_DM_PMI = 0x2, /* pend a PMI */
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IA64_IPI_DM_NMI = 0x4, /* pend an NMI (vector 2) */
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IA64_IPI_DM_INIT = 0x5, /* pend an INIT interrupt */
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IA64_IPI_DM_EXTINT = 0x7, /* pend an 8259-compatible interrupt. */
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};
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extern __u8 isa_irq_to_vector_map[16];
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#define isa_irq_to_vector(x) isa_irq_to_vector_map[(x)]
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extern struct hw_interrupt_type irq_type_ia64_lsapic; /* CPU-internal interrupt controller */
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extern int assign_irq_vector (int irq); /* allocate a free vector */
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extern void free_irq_vector (int vector);
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extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);
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extern void register_percpu_irq (ia64_vector vec, struct irqaction *action);
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static inline void
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hw_resend_irq (struct hw_interrupt_type *h, unsigned int vector)
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{
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platform_send_ipi(smp_processor_id(), vector, IA64_IPI_DM_INT, 0);
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}
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/*
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* Default implementations for the irq-descriptor API:
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*/
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extern irq_desc_t irq_desc[NR_IRQS];
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#ifndef CONFIG_IA64_GENERIC
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static inline unsigned int
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__ia64_local_vector_to_irq (ia64_vector vec)
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{
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return (unsigned int) vec;
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}
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#endif
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/*
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* Next follows the irq descriptor interface. On IA-64, each CPU supports 256 interrupt
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* vectors. On smaller systems, there is a one-to-one correspondence between interrupt
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* vectors and the Linux irq numbers. However, larger systems may have multiple interrupt
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* domains meaning that the translation from vector number to irq number depends on the
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* interrupt domain that a CPU belongs to. This API abstracts such platform-dependent
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* differences and provides a uniform means to translate between vector and irq numbers
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* and to obtain the irq descriptor for a given irq number.
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*/
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/* Return a pointer to the irq descriptor for IRQ. */
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static inline irq_desc_t *
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irq_descp (int irq)
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{
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return irq_desc + irq;
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}
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/* Extract the IA-64 vector that corresponds to IRQ. */
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static inline ia64_vector
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irq_to_vector (int irq)
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{
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return (ia64_vector) irq;
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}
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/*
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* Convert the local IA-64 vector to the corresponding irq number. This translation is
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* done in the context of the interrupt domain that the currently executing CPU belongs
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* to.
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*/
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static inline unsigned int
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local_vector_to_irq (ia64_vector vec)
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{
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return platform_local_vector_to_irq(vec);
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}
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#endif /* _ASM_IA64_HW_IRQ_H */
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