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When handling writes to /proc/irq, current code is re-programming rte entries directly. This is not recommended and could potentially cause chipset's to lockup, or cause missing interrupts. CONFIG_IRQ_BALANCE does this correctly, where it re-programs only when the interrupt is pending. The same needs to be done for /proc/irq handling as well. Otherwise user space irq balancers are really not doing the right thing. - Changed pending_irq_balance_cpumask to pending_irq_migrate_cpumask for lack of a generic name. - added move_irq out of IRQ_BALANCE, and added this same to X86_64 - Added new proc handler for write, so we can do deferred write at irq handling time. - Display of /proc/irq/XX/smp_affinity used to display CPU_MASKALL, instead it now shows only active cpu masks, or exactly what was set. - Provided a common move_irq implementation, instead of duplicating when using generic irq framework. Tested on i386/x86_64 and ia64 with CONFIG_PCI_MSI turned on and off. Tested UP builds as well. MSI testing: tbd: I have cards, need to look for a x-over cable, although I did test an earlier version of this patch. Will test in a couple days. Signed-off-by: Ashok Raj <ashok.raj@intel.com> Acked-by: Zwane Mwaikambo <zwane@holomorphy.com> Grudgingly-acked-by: Andi Kleen <ak@muc.de> Signed-off-by: Coywolf Qi Hunt <coywolf@lovecn.org> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
138 lines
4.2 KiB
C
138 lines
4.2 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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/* 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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