1f44a22577
With the introduction of PCI it became apparent that s390 should convert to generic hardirqs as too many drivers do not have the correct dependency for GENERIC_HARDIRQS. On the architecture level s390 does not have irq lines. It has external interrupts, I/O interrupts and adapter interrupts. This patch hard-codes all external interrupts as irq #1, all I/O interrupts as irq #2 and all adapter interrupts as irq #3. The additional information from the lowcore associated with the interrupt is stored in the pt_regs of the interrupt frame, where the interrupt handler can pick it up. For PCI/MSI interrupts the adapter interrupt handler scans the relevant bit fields and calls generic_handle_irq with the virtual irq number for the MSI interrupt. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
#ifndef _ASM_IRQ_H
|
|
#define _ASM_IRQ_H
|
|
|
|
#define EXT_INTERRUPT 1
|
|
#define IO_INTERRUPT 2
|
|
#define THIN_INTERRUPT 3
|
|
|
|
#define NR_IRQS_BASE 4
|
|
|
|
#ifdef CONFIG_PCI_NR_MSI
|
|
# define NR_IRQS (NR_IRQS_BASE + CONFIG_PCI_NR_MSI)
|
|
#else
|
|
# define NR_IRQS NR_IRQS_BASE
|
|
#endif
|
|
|
|
/* This number is used when no interrupt has been assigned */
|
|
#define NO_IRQ 0
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/hardirq.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/types.h>
|
|
|
|
enum interruption_class {
|
|
IRQEXT_CLK,
|
|
IRQEXT_EXC,
|
|
IRQEXT_EMS,
|
|
IRQEXT_TMR,
|
|
IRQEXT_TLA,
|
|
IRQEXT_PFL,
|
|
IRQEXT_DSD,
|
|
IRQEXT_VRT,
|
|
IRQEXT_SCP,
|
|
IRQEXT_IUC,
|
|
IRQEXT_CMS,
|
|
IRQEXT_CMC,
|
|
IRQEXT_CMR,
|
|
IRQIO_CIO,
|
|
IRQIO_QAI,
|
|
IRQIO_DAS,
|
|
IRQIO_C15,
|
|
IRQIO_C70,
|
|
IRQIO_TAP,
|
|
IRQIO_VMR,
|
|
IRQIO_LCS,
|
|
IRQIO_CLW,
|
|
IRQIO_CTC,
|
|
IRQIO_APB,
|
|
IRQIO_ADM,
|
|
IRQIO_CSC,
|
|
IRQIO_PCI,
|
|
IRQIO_MSI,
|
|
IRQIO_VIR,
|
|
NMI_NMI,
|
|
CPU_RST,
|
|
NR_ARCH_IRQS
|
|
};
|
|
|
|
struct irq_stat {
|
|
unsigned int irqs[NR_ARCH_IRQS];
|
|
};
|
|
|
|
DECLARE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
|
|
|
|
static __always_inline void inc_irq_stat(enum interruption_class irq)
|
|
{
|
|
__get_cpu_var(irq_stat).irqs[irq]++;
|
|
}
|
|
|
|
struct ext_code {
|
|
unsigned short subcode;
|
|
unsigned short code;
|
|
};
|
|
|
|
typedef void (*ext_int_handler_t)(struct ext_code, unsigned int, unsigned long);
|
|
|
|
int register_external_interrupt(u16 code, ext_int_handler_t handler);
|
|
int unregister_external_interrupt(u16 code, ext_int_handler_t handler);
|
|
void service_subclass_irq_register(void);
|
|
void service_subclass_irq_unregister(void);
|
|
void measurement_alert_subclass_register(void);
|
|
void measurement_alert_subclass_unregister(void);
|
|
|
|
#define irq_canonicalize(irq) (irq)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_IRQ_H */
|