/*
* Xen Event Channels (internal header)
*
* Copyright (C) 2013 Citrix Systems R&D Ltd.
*
* This source code is licensed under the GNU General Public License,
* Version 2 or later. See the file COPYING for more details.
*/
#ifndef __EVENTS_INTERNAL_H__
#define __EVENTS_INTERNAL_H__
/* Interrupt types. */
enum xen_irq_type {
IRQT_UNBOUND = 0,
IRQT_PIRQ,
IRQT_VIRQ,
IRQT_IPI,
IRQT_EVTCHN
};
/*
* Packed IRQ information:
* type - enum xen_irq_type
* event channel - irq->event channel mapping
* cpu - cpu this event channel is bound to
* index - type-specific information:
* PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
* guest, or GSI (real passthrough IRQ) of the device.
* VIRQ - virq number
* IPI - IPI vector
* EVTCHN -
*/
struct irq_info {
struct list_head list;
int refcnt;
enum xen_irq_type type; /* type */
unsigned irq;
unsigned int evtchn; /* event channel */
unsigned short cpu; /* cpu bound */
union {
unsigned short virq;
enum ipi_vector ipi;
struct {
unsigned short pirq;
unsigned short gsi;
unsigned char vector;
unsigned char flags;
uint16_t domid;
} pirq;
} u;
};
#define PIRQ_NEEDS_EOI (1 << 0)
#define PIRQ_SHAREABLE (1 << 1)
#define PIRQ_MSI_GROUP (1 << 2)
struct evtchn_ops {
unsigned (*max_channels)(void);
unsigned (*nr_channels)(void);
int (*setup)(struct irq_info *info);
void (*bind_to_cpu)(struct irq_info *info, unsigned cpu);
void (*clear_pending)(unsigned port);
void (*set_pending)(unsigned port);
bool (*is_pending)(unsigned port);
bool (*test_and_set_mask)(unsigned port);
void (*mask)(unsigned port);
void (*unmask)(unsigned port);
void (*handle_events)(unsigned cpu);
void (*resume)(void);
};
extern const struct evtchn_ops *evtchn_ops;
extern int **evtchn_to_irq;
int get_evtchn_to_irq(unsigned int evtchn);
struct irq_info *info_for_irq(unsigned irq);
unsigned cpu_from_irq(unsigned irq);
unsigned cpu_from_evtchn(unsigned int evtchn);
static inline unsigned xen_evtchn_max_channels(void)
{
return evtchn_ops->max_channels();
}
/*
* Do any ABI specific setup for a bound event channel before it can
* be unmasked and used.
*/
static inline int xen_evtchn_port_setup(struct irq_info *info)
{
if (evtchn_ops->setup)
return evtchn_ops->setup(info);
return 0;
}
static inline void xen_evtchn_port_bind_to_cpu(struct irq_info *info,
unsigned cpu)
{
evtchn_ops->bind_to_cpu(info, cpu);
}
static inline void clear_evtchn(unsigned port)
{
evtchn_ops->clear_pending(port);
}
static inline void set_evtchn(unsigned port)
{
evtchn_ops->set_pending(port);
}
static inline bool test_evtchn(unsigned port)
{
return evtchn_ops->is_pending(port);
}
static inline bool test_and_set_mask(unsigned port)
{
return evtchn_ops->test_and_set_mask(port);
}
static inline void mask_evtchn(unsigned port)
{
return evtchn_ops->mask(port);
}
static inline void unmask_evtchn(unsigned port)
{
return evtchn_ops->unmask(port);
}
static inline void xen_evtchn_handle_events(unsigned cpu)
{
return evtchn_ops->handle_events(cpu);
}
static inline void xen_evtchn_resume(void)
{
if (evtchn_ops->resume)
evtchn_ops->resume();
}
void xen_evtchn_2l_init(void);
int xen_evtchn_fifo_init(void);
#endif /* #ifndef __EVENTS_INTERNAL_H__ */
'/>context: 1 2 3 4 5 6 7 8 9 10 15 20 25 30 35 40 space: include ignore mode: unified ssdiff stat only pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
According to VLI64 Intel Atom E3800 Specification Update (#329901)
concurrent read accesses may result in returning 0xffffffff and write
accesses may be dropped silently.
To workaround all accesses must be protected by locks.
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>