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7e6a239646
Prior to this patch, one single iothread instance is created and initialized in the `main` function. This single iothread monitors all the registered fds and handles all the corresponding requests. It leads to the limited flexibility of the iothread support. To improve the flexibility of the iothread support, this patch does: - add the support of multiple iothread instances. `iothread_create` is introduced to create a certain number of iothread instances. It shall be called at first by each virtual device owner (such as virtio-blk BE) on initialization phase. Then, `iothread_add` can be called to add the to be monitored fd to the specified iothread. - update virtio-blk BE to let the acrn-dm option `iothread` accept a number as the number of iothread instances to be created. If `iothread` is contained in the parameters, but the number is not specified, one iothread instance would be created by default. Examples to specify the number of iothread instances: 1. Create 2 iothread instances `add_virtual_device 9 virtio-blk iothread=2,mq=2,/dev/nvme1n1,writeback,aio=io_uring` 2. Create 1 iothread instances (by default) `add_virtual_device 9 virtio-blk iothread,mq=2,/dev/nvme1n1,writeback,aio=io_uring` - update virtio-blk BE to separate the request handling of different virtqueues to different iothreads. The request from one or more virtqueues can be handled in one iothread. The mapping between virtqueues and iothreads is based on round robin. v1 -> v2: * add a mutex to protect the free ioctx slot allocation Tracked-On: #8612 Signed-off-by: Shiqing Gao <shiqing.gao@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>
81 lines
3.2 KiB
C
81 lines
3.2 KiB
C
/*-
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* Copyright (c) 2013 Peter Grehan <grehan@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* The block API to be used by acrn-dm block-device emulations. The routines
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* are thread safe, with no assumptions about the context of the completion
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* callback - it may occur in the caller's context, or asynchronously in
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* another thread.
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*/
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#ifndef _BLOCK_IF_H_
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#define _BLOCK_IF_H_
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include "iothread.h"
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#define BLOCKIF_IOV_MAX 256 /* not practical to be IOV_MAX */
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struct blockif_req {
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struct iovec iov[BLOCKIF_IOV_MAX];
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int iovcnt;
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off_t offset;
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ssize_t resid;
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void (*callback)(struct blockif_req *req, int err);
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void *param;
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int qidx;
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};
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struct blockif_ctxt;
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struct blockif_ctxt *blockif_open(const char *optstr, const char *ident, int queue_num,
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struct iothreads_info *iothrds_info);
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off_t blockif_size(struct blockif_ctxt *bc);
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void blockif_chs(struct blockif_ctxt *bc, uint16_t *c, uint8_t *h,
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uint8_t *s);
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int blockif_sectsz(struct blockif_ctxt *bc);
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void blockif_psectsz(struct blockif_ctxt *bc, int *size, int *off);
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int blockif_queuesz(struct blockif_ctxt *bc);
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int blockif_is_ro(struct blockif_ctxt *bc);
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int blockif_candiscard(struct blockif_ctxt *bc);
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int blockif_read(struct blockif_ctxt *bc, struct blockif_req *breq);
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int blockif_write(struct blockif_ctxt *bc, struct blockif_req *breq);
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int blockif_flush(struct blockif_ctxt *bc, struct blockif_req *breq);
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int blockif_discard(struct blockif_ctxt *bc, struct blockif_req *breq);
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int blockif_cancel(struct blockif_ctxt *bc, struct blockif_req *breq);
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int blockif_close(struct blockif_ctxt *bc);
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uint8_t blockif_get_wce(struct blockif_ctxt *bc);
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void blockif_set_wce(struct blockif_ctxt *bc, uint8_t wce);
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int blockif_flush_all(struct blockif_ctxt *bc);
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int blockif_max_discard_sectors(struct blockif_ctxt *bc);
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int blockif_max_discard_seg(struct blockif_ctxt *bc);
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int blockif_discard_sector_alignment(struct blockif_ctxt *bc);
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#endif /* _BLOCK_IF_H_ */
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