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hw/vfio/platform: add irq assignment

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This patch adds the code requested to assign interrupts to
a guest. The interrupts are mediated through user handled
eventfds only.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Vikram Sethi <vikrams@codeaurora.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2015-06-08 09:25:26 -06:00 • committed by Alex Williamson
parent 0ea2730bef
commit 38559979bf
3 changed files with 368 additions and 1 deletions
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31
include/hw/vfio/vfio-platform.h
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@ -18,14 +18,45 @@
#include "hw/sysbus.h"
#include "hw/vfio/vfio-common.h"
#include "qemu/event_notifier.h"
#include "qemu/queue.h"
#include "hw/irq.h"
#define TYPE_VFIO_PLATFORM "vfio-platform"
enum {
VFIO_IRQ_INACTIVE = 0,
VFIO_IRQ_PENDING = 1,
VFIO_IRQ_ACTIVE = 2,
/* VFIO_IRQ_ACTIVE_AND_PENDING cannot happen with VFIO */
};
typedef struct VFIOINTp {
QLIST_ENTRY(VFIOINTp) next; /* entry for IRQ list */
QSIMPLEQ_ENTRY(VFIOINTp) pqnext; /* entry for pending IRQ queue */
EventNotifier interrupt; /* eventfd triggered on interrupt */
EventNotifier unmask; /* eventfd for unmask on QEMU bypass */
qemu_irq qemuirq;
struct VFIOPlatformDevice *vdev; /* back pointer to device */
int state; /* inactive, pending, active */
uint8_t pin; /* index */
uint32_t flags; /* IRQ info flags */
} VFIOINTp;
/* function type for user side eventfd handler */
typedef void (*eventfd_user_side_handler_t)(VFIOINTp *intp);
typedef struct VFIOPlatformDevice {
SysBusDevice sbdev;
VFIODevice vbasedev; /* not a QOM object */
VFIORegion **regions;
QLIST_HEAD(, VFIOINTp) intp_list; /* list of IRQs */
/* queue of pending IRQs */
QSIMPLEQ_HEAD(pending_intp_queue, VFIOINTp) pending_intp_queue;
char *compat; /* compatibility string */
uint32_t mmap_timeout; /* delay to re-enable mmaps after interrupt */
QEMUTimer *mmap_timer; /* allows fast-path resume after IRQ hit */
QemuMutex intp_mutex; /* protect the intp_list IRQ state */
} VFIOPlatformDevice;
typedef struct VFIOPlatformDeviceClass {