xref: /openbmc/qemu/include/hw/vfio/vfio-platform.h (revision 2b74dd91)
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 */
77