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6c1dd652a6
In order to emulate the adapter interruption suppression (AIS)
facility properly, the guest needs to be able to modify the AIS mask.
Interrupt suppression will be handled via the flic (for kvm, via a
recently introduced kernel backend; for !kvm, in the flic code), so
let's introduce a method to change the mode via the flic interface.
We introduce the 'simm' and 'nimm' fields to QEMUS390FLICState
to store interruption modes for each ISC. Each bit in 'simm' and
'nimm' targets one ISC, and collaboratively indicate three modes:
ALL-Interruptions, SINGLE-Interruption and NO-Interruptions. This
interface can initiate most transitions between the states; transition
from SINGLE-Interruption to NO-Interruptions via adapter interrupt
injection will be introduced in a following patch. The meaningful
combinations are as follows:
interruption mode | simm bit | nimm bit
------------------|----------|----------
ALL | 0 | 0
SINGLE | 1 | 0
NO | 1 | 1
Co-authored-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: Fei Li <sherrylf@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
100 lines
3 KiB
C
100 lines
3 KiB
C
/*
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* QEMU S390x floating interrupt controller (flic)
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*
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* Copyright 2014 IBM Corp.
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* Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef HW_S390_FLIC_H
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#define HW_S390_FLIC_H
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#include "hw/sysbus.h"
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#include "hw/s390x/adapter.h"
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#include "hw/virtio/virtio.h"
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/*
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* Reserve enough gsis to accommodate all virtio devices.
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* If any other user of adapter routes needs more of these,
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* we need to bump the value; but virtio looks like the
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* maximum right now.
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*/
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#define ADAPTER_ROUTES_MAX_GSI VIRTIO_QUEUE_MAX
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typedef struct AdapterRoutes {
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AdapterInfo adapter;
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int num_routes;
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int gsi[ADAPTER_ROUTES_MAX_GSI];
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} AdapterRoutes;
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extern const VMStateDescription vmstate_adapter_routes;
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#define VMSTATE_ADAPTER_ROUTES(_f, _s) \
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VMSTATE_STRUCT(_f, _s, 1, vmstate_adapter_routes, AdapterRoutes)
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#define TYPE_S390_FLIC_COMMON "s390-flic"
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#define S390_FLIC_COMMON(obj) \
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OBJECT_CHECK(S390FLICState, (obj), TYPE_S390_FLIC_COMMON)
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typedef struct S390FLICState {
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SysBusDevice parent_obj;
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/* to limit AdapterRoutes.num_routes for compat */
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uint32_t adapter_routes_max_batch;
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bool ais_supported;
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} S390FLICState;
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#define S390_FLIC_COMMON_CLASS(klass) \
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OBJECT_CLASS_CHECK(S390FLICStateClass, (klass), TYPE_S390_FLIC_COMMON)
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#define S390_FLIC_COMMON_GET_CLASS(obj) \
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OBJECT_GET_CLASS(S390FLICStateClass, (obj), TYPE_S390_FLIC_COMMON)
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typedef struct S390FLICStateClass {
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DeviceClass parent_class;
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int (*register_io_adapter)(S390FLICState *fs, uint32_t id, uint8_t isc,
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bool swap, bool maskable, uint8_t flags);
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int (*io_adapter_map)(S390FLICState *fs, uint32_t id, uint64_t map_addr,
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bool do_map);
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int (*add_adapter_routes)(S390FLICState *fs, AdapterRoutes *routes);
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void (*release_adapter_routes)(S390FLICState *fs, AdapterRoutes *routes);
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int (*clear_io_irq)(S390FLICState *fs, uint16_t subchannel_id,
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uint16_t subchannel_nr);
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int (*modify_ais_mode)(S390FLICState *fs, uint8_t isc, uint16_t mode);
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} S390FLICStateClass;
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#define TYPE_KVM_S390_FLIC "s390-flic-kvm"
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#define KVM_S390_FLIC(obj) \
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OBJECT_CHECK(KVMS390FLICState, (obj), TYPE_KVM_S390_FLIC)
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#define TYPE_QEMU_S390_FLIC "s390-flic-qemu"
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#define QEMU_S390_FLIC(obj) \
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OBJECT_CHECK(QEMUS390FLICState, (obj), TYPE_QEMU_S390_FLIC)
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#define SIC_IRQ_MODE_ALL 0
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#define SIC_IRQ_MODE_SINGLE 1
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#define AIS_MODE_MASK(isc) (0x80 >> isc)
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typedef struct QEMUS390FLICState {
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S390FLICState parent_obj;
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uint8_t simm;
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uint8_t nimm;
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} QEMUS390FLICState;
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void s390_flic_init(void);
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S390FLICState *s390_get_flic(void);
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#ifdef CONFIG_KVM
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DeviceState *s390_flic_kvm_create(void);
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#else
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static inline DeviceState *s390_flic_kvm_create(void)
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{
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return NULL;
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}
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#endif
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#endif /* HW_S390_FLIC_H */
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