include/hw/vfio/vfio-platform.h

   1 /*
   2  * vfio based device assignment support - platform devices
   3  *
   4  * Copyright Linaro Limited, 2014
   5  *
   6  * Authors:
   7  *  Kim Phillips <kim.phillips@linaro.org>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Based on vfio based PCI device assignment support:
  13  *  Copyright Red Hat, Inc. 2012
  14  */
  15
  16 #ifndef HW_VFIO_VFIO_PLATFORM_H
  17 #define HW_VFIO_VFIO_PLATFORM_H
  18
  19 #include "hw/sysbus.h"
  20 #include "hw/vfio/vfio-common.h"
  21 #include "qemu/event_notifier.h"
  22 #include "qemu/queue.h"
  23 #include "qom/object.h"
  24
  25 #define TYPE_VFIO_PLATFORM "vfio-platform"
  26
  27 enum {
  28     VFIO_IRQ_INACTIVE = 0,
  29     VFIO_IRQ_PENDING = 1,
  30     VFIO_IRQ_ACTIVE = 2,
  31     /* VFIO_IRQ_ACTIVE_AND_PENDING cannot happen with VFIO */
  32 };
  33
  34 typedef struct VFIOINTp {
  35     QLIST_ENTRY(VFIOINTp) next; /* entry for IRQ list */
  36     QSIMPLEQ_ENTRY(VFIOINTp) pqnext; /* entry for pending IRQ queue */
  37     EventNotifier *interrupt; /* eventfd triggered on interrupt */
  38     EventNotifier *unmask; /* eventfd for unmask on QEMU bypass */
  39     qemu_irq qemuirq;
  40     struct VFIOPlatformDevice *vdev; /* back pointer to device */
  41     int state; /* inactive, pending, active */
  42     uint8_t pin; /* index */
  43     uint32_t flags; /* IRQ info flags */
  44     bool kvm_accel; /* set when QEMU bypass through KVM enabled */
  45 } VFIOINTp;
  46
  47 /* function type for user side eventfd handler */
  48 typedef void (*eventfd_user_side_handler_t)(VFIOINTp *intp);
  49
  50 struct VFIOPlatformDevice {
  51     SysBusDevice sbdev;
  52     VFIODevice vbasedev; /* not a QOM object */
  53     VFIORegion **regions;
  54     QLIST_HEAD(, VFIOINTp) intp_list; /* list of IRQs */
  55     /* queue of pending IRQs */
  56     QSIMPLEQ_HEAD(, VFIOINTp) pending_intp_queue;
  57     char *compat; /* DT compatible values, separated by NUL */
  58     unsigned int num_compat; /* number of compatible values */
  59     uint32_t mmap_timeout; /* delay to re-enable mmaps after interrupt */
  60     QEMUTimer *mmap_timer; /* allows fast-path resume after IRQ hit */
  61     QemuMutex intp_mutex; /* protect the intp_list IRQ state */
  62     bool irqfd_allowed; /* debug option to force irqfd on/off */
  63 };
  64 typedef struct VFIOPlatformDevice VFIOPlatformDevice;
  65
  66 struct VFIOPlatformDeviceClass {
  67     /*< private >*/
  68     SysBusDeviceClass parent_class;
  69     /*< public >*/
  70 };
  71 typedef struct VFIOPlatformDeviceClass VFIOPlatformDeviceClass;
  72
  73 DECLARE_OBJ_CHECKERS(VFIOPlatformDevice, VFIOPlatformDeviceClass,
  74                      VFIO_PLATFORM_DEVICE, TYPE_VFIO_PLATFORM)
  75
  76 #endif /* HW_VFIO_VFIO_PLATFORM_H */