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bh=B4gn/b+GTHHCxpuvqYdqnUS2Q5NdEP6gRxpyyy6TaKM=; b=TKjj++rCg2x3VyPKg+vorvyIuRQnh9O6u6TfYmRq+JTsleQuOZdOEpIoP5DN4/DKSV/9PY QUsX2mn6h6Dk2jHWxRKp0cMydb5fXWb5DkZWRItaGPiVqbZehCTgHbshzTNlTjwACBilDm WePv4Mqt3tkM85ynyX/BVwNVZCiYVKM= X-MC-Unique: YuZja7b3MkarVScE5ydaZA-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 06/28] block-coroutine-wrapper: Add no_co_wrapper_bdrv_wrlock functions Date: Fri, 15 Sep 2023 16:43:22 +0200 Message-ID: <20230915144344.238596-7-kwolf@redhat.com> In-Reply-To: <20230915144344.238596-1-kwolf@redhat.com> References: <20230915144344.238596-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1694789140082100001 Content-Type: text/plain; charset="utf-8" Add a new wrapper type for GRAPH_WRLOCK functions that should be called from coroutine context. Signed-off-by: Kevin Wolf Reviewed-by: Emanuele Giuseppe Esposito Reviewed-by: Stefan Hajnoczi Message-ID: <20230911094620.45040-7-kwolf@redhat.com> Signed-off-by: Kevin Wolf --- include/block/block-common.h | 4 ++++ scripts/block-coroutine-wrapper.py | 11 +++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/block/block-common.h b/include/block/block-common.h index df5ffc8d09..3bbc5d9294 100644 --- a/include/block/block-common.h +++ b/include/block/block-common.h @@ -66,10 +66,14 @@ * function. The coroutine yields after scheduling the BH and is reentered= when * the wrapped function returns. * + * A no_co_wrapper_bdrv_wrlock function is a no_co_wrapper function that + * automatically takes the graph wrlock when calling the wrapped function. + * * If the first parameter of the function is a BlockDriverState, BdrvChild= or * BlockBackend pointer, the AioContext lock for it is taken in the wrappe= r. */ #define no_co_wrapper +#define no_co_wrapper_bdrv_wrlock =20 #include "block/blockjob.h" =20 diff --git a/scripts/block-coroutine-wrapper.py b/scripts/block-coroutine-w= rapper.py index d4a183db61..fa01c06567 100644 --- a/scripts/block-coroutine-wrapper.py +++ b/scripts/block-coroutine-wrapper.py @@ -71,10 +71,13 @@ def __init__(self, wrapper_type: str, return_type: str,= name: str, self.args =3D [ParamDecl(arg.strip()) for arg in args.split(',')] self.create_only_co =3D 'mixed' not in variant self.graph_rdlock =3D 'bdrv_rdlock' in variant + self.graph_wrlock =3D 'bdrv_wrlock' in variant =20 self.wrapper_type =3D wrapper_type =20 if wrapper_type =3D=3D 'co': + if self.graph_wrlock: + raise ValueError(f"co function can't be wrlock: {self.name= }") subsystem, subname =3D self.name.split('_', 1) self.target_name =3D f'{subsystem}_co_{subname}' else: @@ -250,6 +253,12 @@ def gen_no_co_wrapper(func: FuncDecl) -> str: name =3D func.target_name struct_name =3D func.struct_name =20 + graph_lock=3D'' + graph_unlock=3D'' + if func.graph_wrlock: + graph_lock=3D' bdrv_graph_wrlock(NULL);' + graph_unlock=3D' bdrv_graph_wrunlock();' + return f"""\ /* * Wrappers for {name} @@ -266,9 +275,11 @@ def gen_no_co_wrapper(func: FuncDecl) -> str: {struct_name} *s =3D opaque; AioContext *ctx =3D {func.gen_ctx('s->')}; =20 +{graph_lock} aio_context_acquire(ctx); {func.get_result}{name}({ func.gen_list('s->{name}') }); aio_context_release(ctx); +{graph_unlock} =20 aio_co_wake(s->co); }} --=20 2.41.0