From 61d605433a5edfcc7fe836fd399106ed1e1907bb Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Tue, 5 Dec 2023 13:20:05 -0500 Subject: [PATCH 088/101] scsi: remove AioContext locking RH-Author: Kevin Wolf RH-MergeRequest: 214: Remove AioContext lock RH-Jira: RHEL-15965 RH-Acked-by: Miroslav Rezanina RH-Acked-by: Stefan Hajnoczi RH-Commit: [19/26] 12a8e26670074a17dd2b0cfac06e0aea03b3068f (kmwolf/centos-qemu-kvm) The AioContext lock no longer has any effect. Remove it. Signed-off-by: Stefan Hajnoczi Reviewed-by: Eric Blake Message-ID: <20231205182011.1976568-9-stefanha@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- hw/scsi/scsi-bus.c | 2 -- hw/scsi/scsi-disk.c | 31 +++++-------------------------- hw/scsi/virtio-scsi.c | 18 ------------------ include/hw/virtio/virtio-scsi.h | 14 -------------- 4 files changed, 5 insertions(+), 60 deletions(-) diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index b649cdf555..5b08cbf60a 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -1732,9 +1732,7 @@ void scsi_device_purge_requests(SCSIDevice *sdev, SCSISense sense) { scsi_device_for_each_req_async(sdev, scsi_device_purge_one_req, NULL); - aio_context_acquire(blk_get_aio_context(sdev->conf.blk)); blk_drain(sdev->conf.blk); - aio_context_release(blk_get_aio_context(sdev->conf.blk)); scsi_device_set_ua(sdev, sense); } diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index a5048e0aaf..61be3d395a 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -2339,14 +2339,10 @@ static void scsi_disk_reset(DeviceState *dev) { SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev.qdev, dev); uint64_t nb_sectors; - AioContext *ctx; scsi_device_purge_requests(&s->qdev, SENSE_CODE(RESET)); - ctx = blk_get_aio_context(s->qdev.conf.blk); - aio_context_acquire(ctx); blk_get_geometry(s->qdev.conf.blk, &nb_sectors); - aio_context_release(ctx); nb_sectors /= s->qdev.blocksize / BDRV_SECTOR_SIZE; if (nb_sectors) { @@ -2545,15 +2541,13 @@ static void scsi_unrealize(SCSIDevice *dev) static void scsi_hd_realize(SCSIDevice *dev, Error **errp) { SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev); - AioContext *ctx = NULL; + /* can happen for devices without drive. The error message for missing * backend will be issued in scsi_realize */ if (s->qdev.conf.blk) { - ctx = blk_get_aio_context(s->qdev.conf.blk); - aio_context_acquire(ctx); if (!blkconf_blocksizes(&s->qdev.conf, errp)) { - goto out; + return; } } s->qdev.blocksize = s->qdev.conf.logical_block_size; @@ -2562,16 +2556,11 @@ static void scsi_hd_realize(SCSIDevice *dev, Error **errp) s->product = g_strdup("QEMU HARDDISK"); } scsi_realize(&s->qdev, errp); -out: - if (ctx) { - aio_context_release(ctx); - } } static void scsi_cd_realize(SCSIDevice *dev, Error **errp) { SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev); - AioContext *ctx; int ret; uint32_t blocksize = 2048; @@ -2587,8 +2576,6 @@ static void scsi_cd_realize(SCSIDevice *dev, Error **errp) blocksize = dev->conf.physical_block_size; } - ctx = blk_get_aio_context(dev->conf.blk); - aio_context_acquire(ctx); s->qdev.blocksize = blocksize; s->qdev.type = TYPE_ROM; s->features |= 1 << SCSI_DISK_F_REMOVABLE; @@ -2596,7 +2583,6 @@ static void scsi_cd_realize(SCSIDevice *dev, Error **errp) s->product = g_strdup("QEMU CD-ROM"); } scsi_realize(&s->qdev, errp); - aio_context_release(ctx); } @@ -2727,7 +2713,6 @@ static int get_device_type(SCSIDiskState *s) static void scsi_block_realize(SCSIDevice *dev, Error **errp) { SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev); - AioContext *ctx; int sg_version; int rc; @@ -2742,9 +2727,6 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp) "be removed in a future version"); } - ctx = blk_get_aio_context(s->qdev.conf.blk); - aio_context_acquire(ctx); - /* check we are using a driver managing SG_IO (version 3 and after) */ rc = blk_ioctl(s->qdev.conf.blk, SG_GET_VERSION_NUM, &sg_version); if (rc < 0) { @@ -2752,18 +2734,18 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp) if (rc != -EPERM) { error_append_hint(errp, "Is this a SCSI device?\n"); } - goto out; + return; } if (sg_version < 30000) { error_setg(errp, "scsi generic interface too old"); - goto out; + return; } /* get device type from INQUIRY data */ rc = get_device_type(s); if (rc < 0) { error_setg(errp, "INQUIRY failed"); - goto out; + return; } /* Make a guess for the block size, we'll fix it when the guest sends. @@ -2783,9 +2765,6 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp) scsi_realize(&s->qdev, errp); scsi_generic_read_device_inquiry(&s->qdev); - -out: - aio_context_release(ctx); } typedef struct SCSIBlockReq { diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c index 4f8d35facc..ca365a70e9 100644 --- a/hw/scsi/virtio-scsi.c +++ b/hw/scsi/virtio-scsi.c @@ -642,9 +642,7 @@ static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) return; } - virtio_scsi_acquire(s); virtio_scsi_handle_ctrl_vq(s, vq); - virtio_scsi_release(s); } static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req) @@ -882,9 +880,7 @@ static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) return; } - virtio_scsi_acquire(s); virtio_scsi_handle_cmd_vq(s, vq); - virtio_scsi_release(s); } static void virtio_scsi_get_config(VirtIODevice *vdev, @@ -1031,9 +1027,7 @@ static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) return; } - virtio_scsi_acquire(s); virtio_scsi_handle_event_vq(s, vq); - virtio_scsi_release(s); } static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) @@ -1052,9 +1046,7 @@ static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) }, }; - virtio_scsi_acquire(s); virtio_scsi_push_event(s, &info); - virtio_scsi_release(s); } } @@ -1071,17 +1063,13 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev); VirtIOSCSI *s = VIRTIO_SCSI(vdev); SCSIDevice *sd = SCSI_DEVICE(dev); - AioContext *old_context; int ret; if (s->ctx && !s->dataplane_fenced) { if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { return; } - old_context = blk_get_aio_context(sd->conf.blk); - aio_context_acquire(old_context); ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp); - aio_context_release(old_context); if (ret < 0) { return; } @@ -1097,10 +1085,8 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, }, }; - virtio_scsi_acquire(s); virtio_scsi_push_event(s, &info); scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); - virtio_scsi_release(s); } } @@ -1122,17 +1108,13 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); if (s->ctx) { - virtio_scsi_acquire(s); /* If other users keep the BlockBackend in the iothread, that's ok */ blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); - virtio_scsi_release(s); } if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { - virtio_scsi_acquire(s); virtio_scsi_push_event(s, &info); scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); - virtio_scsi_release(s); } } diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h index da8cb928d9..7f0573b1bf 100644 --- a/include/hw/virtio/virtio-scsi.h +++ b/include/hw/virtio/virtio-scsi.h @@ -101,20 +101,6 @@ struct VirtIOSCSI { uint32_t host_features; }; -static inline void virtio_scsi_acquire(VirtIOSCSI *s) -{ - if (s->ctx) { - aio_context_acquire(s->ctx); - } -} - -static inline void virtio_scsi_release(VirtIOSCSI *s) -{ - if (s->ctx) { - aio_context_release(s->ctx); - } -} - void virtio_scsi_common_realize(DeviceState *dev, VirtIOHandleOutput ctrl, VirtIOHandleOutput evt, -- 2.39.3