mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
f8a8fe61fe
Quite some time ago the interrupt entry stubs for unused vectors in the
system vector range got removed and directly mapped to the spurious
interrupt vector entry point.
Sounds reasonable, but it's subtly broken. The spurious interrupt vector
entry point pushes vector number 0xFF on the stack which makes the whole
logic in __smp_spurious_interrupt() pointless.
As a consequence any spurious interrupt which comes from a vector != 0xFF
is treated as a real spurious interrupt (vector 0xFF) and not
acknowledged. That subsequently stalls all interrupt vectors of equal and
lower priority, which brings the system to a grinding halt.
This can happen because even on 64-bit the system vector space is not
guaranteed to be fully populated. A full compile time handling of the
unused vectors is not possible because quite some of them are conditonally
populated at runtime.
Bring the entry stubs back, which wastes 160 bytes if all stubs are unused,
but gains the proper handling back. There is no point to selectively spare
some of the stubs which are known at compile time as the required code in
the IDT management would be way larger and convoluted.
Do not route the spurious entries through common_interrupt and do_IRQ() as
the original code did. Route it to smp_spurious_interrupt() which evaluates
the vector number and acts accordingly now that the real vector numbers are
handed in.
Fixup the pr_warn so the actual spurious vector (0xff) is clearly
distiguished from the other vectors and also note for the vectored case
whether it was pending in the ISR or not.
"Spurious APIC interrupt (vector 0xFF) on CPU#0, should never happen."
"Spurious interrupt vector 0xed on CPU#1. Acked."
"Spurious interrupt vector 0xee on CPU#1. Not pending!."
Fixes: 2414e021ac ("x86: Avoid building unused IRQ entry stubs")
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Jan Beulich <jbeulich@suse.com>
Link: https://lkml.kernel.org/r/20190628111440.550568228@linutronix.de
165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_HW_IRQ_H
|
|
#define _ASM_X86_HW_IRQ_H
|
|
|
|
/*
|
|
* (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
|
|
*
|
|
* moved some of the old arch/i386/kernel/irq.h to here. VY
|
|
*
|
|
* IRQ/IPI changes taken from work by Thomas Radke
|
|
* <tomsoft@informatik.tu-chemnitz.de>
|
|
*
|
|
* hacked by Andi Kleen for x86-64.
|
|
* unified by tglx
|
|
*/
|
|
|
|
#include <asm/irq_vectors.h>
|
|
|
|
#define IRQ_MATRIX_BITS NR_VECTORS
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/percpu.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/smp.h>
|
|
|
|
#include <linux/atomic.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/sections.h>
|
|
|
|
/* Interrupt handlers registered during init_IRQ */
|
|
extern asmlinkage void apic_timer_interrupt(void);
|
|
extern asmlinkage void x86_platform_ipi(void);
|
|
extern asmlinkage void kvm_posted_intr_ipi(void);
|
|
extern asmlinkage void kvm_posted_intr_wakeup_ipi(void);
|
|
extern asmlinkage void kvm_posted_intr_nested_ipi(void);
|
|
extern asmlinkage void error_interrupt(void);
|
|
extern asmlinkage void irq_work_interrupt(void);
|
|
extern asmlinkage void uv_bau_message_intr1(void);
|
|
|
|
extern asmlinkage void spurious_interrupt(void);
|
|
extern asmlinkage void thermal_interrupt(void);
|
|
extern asmlinkage void reschedule_interrupt(void);
|
|
|
|
extern asmlinkage void irq_move_cleanup_interrupt(void);
|
|
extern asmlinkage void reboot_interrupt(void);
|
|
extern asmlinkage void threshold_interrupt(void);
|
|
extern asmlinkage void deferred_error_interrupt(void);
|
|
|
|
extern asmlinkage void call_function_interrupt(void);
|
|
extern asmlinkage void call_function_single_interrupt(void);
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
struct irq_data;
|
|
struct pci_dev;
|
|
struct msi_desc;
|
|
|
|
enum irq_alloc_type {
|
|
X86_IRQ_ALLOC_TYPE_IOAPIC = 1,
|
|
X86_IRQ_ALLOC_TYPE_HPET,
|
|
X86_IRQ_ALLOC_TYPE_MSI,
|
|
X86_IRQ_ALLOC_TYPE_MSIX,
|
|
X86_IRQ_ALLOC_TYPE_DMAR,
|
|
X86_IRQ_ALLOC_TYPE_UV,
|
|
};
|
|
|
|
struct irq_alloc_info {
|
|
enum irq_alloc_type type;
|
|
u32 flags;
|
|
const struct cpumask *mask; /* CPU mask for vector allocation */
|
|
union {
|
|
int unused;
|
|
#ifdef CONFIG_HPET_TIMER
|
|
struct {
|
|
int hpet_id;
|
|
int hpet_index;
|
|
void *hpet_data;
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_PCI_MSI
|
|
struct {
|
|
struct pci_dev *msi_dev;
|
|
irq_hw_number_t msi_hwirq;
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
struct {
|
|
int ioapic_id;
|
|
int ioapic_pin;
|
|
int ioapic_node;
|
|
u32 ioapic_trigger : 1;
|
|
u32 ioapic_polarity : 1;
|
|
u32 ioapic_valid : 1;
|
|
struct IO_APIC_route_entry *ioapic_entry;
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_DMAR_TABLE
|
|
struct {
|
|
int dmar_id;
|
|
void *dmar_data;
|
|
};
|
|
#endif
|
|
#ifdef CONFIG_X86_UV
|
|
struct {
|
|
int uv_limit;
|
|
int uv_blade;
|
|
unsigned long uv_offset;
|
|
char *uv_name;
|
|
};
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_VMD)
|
|
struct {
|
|
struct msi_desc *desc;
|
|
};
|
|
#endif
|
|
};
|
|
};
|
|
|
|
struct irq_cfg {
|
|
unsigned int dest_apicid;
|
|
unsigned int vector;
|
|
};
|
|
|
|
extern struct irq_cfg *irq_cfg(unsigned int irq);
|
|
extern struct irq_cfg *irqd_cfg(struct irq_data *irq_data);
|
|
extern void lock_vector_lock(void);
|
|
extern void unlock_vector_lock(void);
|
|
#ifdef CONFIG_SMP
|
|
extern void send_cleanup_vector(struct irq_cfg *);
|
|
extern void irq_complete_move(struct irq_cfg *cfg);
|
|
#else
|
|
static inline void send_cleanup_vector(struct irq_cfg *c) { }
|
|
static inline void irq_complete_move(struct irq_cfg *c) { }
|
|
#endif
|
|
|
|
extern void apic_ack_edge(struct irq_data *data);
|
|
#else /* CONFIG_X86_LOCAL_APIC */
|
|
static inline void lock_vector_lock(void) {}
|
|
static inline void unlock_vector_lock(void) {}
|
|
#endif /* CONFIG_X86_LOCAL_APIC */
|
|
|
|
/* Statistics */
|
|
extern atomic_t irq_err_count;
|
|
extern atomic_t irq_mis_count;
|
|
|
|
extern void elcr_set_level_irq(unsigned int irq);
|
|
|
|
extern char irq_entries_start[];
|
|
#ifdef CONFIG_TRACING
|
|
#define trace_irq_entries_start irq_entries_start
|
|
#endif
|
|
|
|
extern char spurious_entries_start[];
|
|
|
|
#define VECTOR_UNUSED NULL
|
|
#define VECTOR_SHUTDOWN ((void *)~0UL)
|
|
#define VECTOR_RETRIGGERED ((void *)~1UL)
|
|
|
|
typedef struct irq_desc* vector_irq_t[NR_VECTORS];
|
|
DECLARE_PER_CPU(vector_irq_t, vector_irq);
|
|
|
|
#endif /* !ASSEMBLY_ */
|
|
|
|
#endif /* _ASM_X86_HW_IRQ_H */
|