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bcede51d2d
Previously the ctrl virtqueue was handled in the AioContext where SCSI requests are processed. When IOThread Virtqueue Mapping was added things become more complicated because SCSI requests could run in other AioContexts. Simplify by handling the ctrl virtqueue in the main loop where reset operations can be performed. Note that BHs are still used canceling SCSI requests in their AioContexts but at least the mean loop activity doesn't need BHs anymore. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20250311132616.1049687-13-stefanha@redhat.com> Tested-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*
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* Virtio SCSI HBA
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_VIRTIO_SCSI_H
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#define QEMU_VIRTIO_SCSI_H
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#include "qom/object.h"
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/* Override CDB/sense data size: they are dynamic (guest controlled) in QEMU */
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#define VIRTIO_SCSI_CDB_SIZE 0
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#define VIRTIO_SCSI_SENSE_SIZE 0
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#include "standard-headers/linux/virtio_scsi.h"
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#include "hw/virtio/virtio.h"
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#include "hw/scsi/scsi.h"
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#include "chardev/char-fe.h"
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#include "qapi/qapi-types-virtio.h"
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#include "system/iothread.h"
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#define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
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OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSICommon, VIRTIO_SCSI_COMMON)
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#define TYPE_VIRTIO_SCSI "virtio-scsi-device"
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OBJECT_DECLARE_SIMPLE_TYPE(VirtIOSCSI, VIRTIO_SCSI)
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#define VIRTIO_SCSI_MAX_CHANNEL 0
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#define VIRTIO_SCSI_MAX_TARGET 255
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#define VIRTIO_SCSI_MAX_LUN 16383
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/* Number of virtqueues that are always present */
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#define VIRTIO_SCSI_VQ_NUM_FIXED 2
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#define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX
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typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
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typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
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typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
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typedef struct virtio_scsi_ctrl_tmf_resp VirtIOSCSICtrlTMFResp;
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typedef struct virtio_scsi_ctrl_an_req VirtIOSCSICtrlANReq;
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typedef struct virtio_scsi_ctrl_an_resp VirtIOSCSICtrlANResp;
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typedef struct virtio_scsi_event VirtIOSCSIEvent;
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typedef struct virtio_scsi_config VirtIOSCSIConfig;
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struct VirtIOSCSIConf {
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uint32_t num_queues;
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uint32_t virtqueue_size;
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bool worker_per_virtqueue;
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bool seg_max_adjust;
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uint32_t max_sectors;
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uint32_t cmd_per_lun;
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char *vhostfd;
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char *wwpn;
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CharBackend chardev;
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uint32_t boot_tpgt;
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IOThread *iothread;
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IOThreadVirtQueueMappingList *iothread_vq_mapping_list;
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};
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struct VirtIOSCSI;
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struct VirtIOSCSICommon {
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VirtIODevice parent_obj;
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VirtIOSCSIConf conf;
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uint32_t sense_size;
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uint32_t cdb_size;
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VirtQueue *ctrl_vq;
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VirtQueue *event_vq;
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VirtQueue **cmd_vqs;
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};
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struct VirtIOSCSIReq;
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struct VirtIOSCSI {
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VirtIOSCSICommon parent_obj;
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SCSIBus bus;
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int resetting; /* written from main loop thread, read from any thread */
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QemuMutex event_lock; /* protects event_vq and events_dropped */
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bool events_dropped;
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QemuMutex ctrl_lock; /* protects ctrl_vq */
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/* Fields for dataplane below */
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AioContext **vq_aio_context; /* per-virtqueue AioContext pointer */
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bool dataplane_started;
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bool dataplane_starting;
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bool dataplane_stopping;
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bool dataplane_fenced;
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uint32_t host_features;
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};
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void virtio_scsi_common_realize(DeviceState *dev,
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VirtIOHandleOutput ctrl,
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VirtIOHandleOutput evt,
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VirtIOHandleOutput cmd,
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Error **errp);
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void virtio_scsi_common_unrealize(DeviceState *dev);
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void virtio_scsi_dataplane_setup(VirtIOSCSI *s, Error **errp);
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void virtio_scsi_dataplane_cleanup(VirtIOSCSI *s);
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int virtio_scsi_dataplane_start(VirtIODevice *s);
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void virtio_scsi_dataplane_stop(VirtIODevice *s);
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#endif /* QEMU_VIRTIO_SCSI_H */
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