From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F3696FBB for ; Tue, 10 Jan 2023 18:21:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C811C433EF; Tue, 10 Jan 2023 18:21:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673374906; bh=utqPgVqT0m6zja5SQxyzGKSRlBavWojWNOKSrtgX6nU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RTiYYFRKx29OtHDm9VYqzNcbVXI8g7tbxNsD+NZipwP56VSPU52R8VUOxQIUixjOH fyvjqayzPLGG7qptbuU3h8AvFer6ygimXgbWq+mAONv/6oEXdjMGUYvSyLQQ03Oisz voYgFT28Ez7C0CHM5qIhBSyXZqmKDakuC7kO4gro= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christoph Hellwig , Keith Busch , Sagi Grimberg , Kanchan Joshi , Sasha Levin Subject: [PATCH 5.15 014/290] nvmet: dont defer passthrough commands with trivial effects to the workqueue Date: Tue, 10 Jan 2023 19:01:46 +0100 Message-Id: <20230110180032.103002423@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230110180031.620810905@linuxfoundation.org> References: <20230110180031.620810905@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Christoph Hellwig [ Upstream commit 2a459f6933e1c459bffb7cc73fd6c900edc714bd ] Mask out the "Command Supported" and "Logical Block Content Change" bits and only defer execution of commands that have non-trivial effects to the workqueue for synchronous execution. This allows to execute admin commands asynchronously on controllers that provide a Command Supported and Effects log page, and will keep allowing to execute Write commands asynchronously once command effects on I/O commands are taken into account. Fixes: c1fef73f793b ("nvmet: add passthru code to process commands") Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Kanchan Joshi Signed-off-by: Sasha Levin --- drivers/nvme/target/passthru.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c index 6220e1dd961a..9b5929754195 100644 --- a/drivers/nvme/target/passthru.c +++ b/drivers/nvme/target/passthru.c @@ -271,14 +271,13 @@ static void nvmet_passthru_execute_cmd(struct nvmet_req *req) } /* - * If there are effects for the command we are about to execute, or - * an end_req function we need to use nvme_execute_passthru_rq() - * synchronously in a work item seeing the end_req function and - * nvme_passthru_end() can't be called in the request done callback - * which is typically in interrupt context. + * If a command needs post-execution fixups, or there are any + * non-trivial effects, make sure to execute the command synchronously + * in a workqueue so that nvme_passthru_end gets called. */ effects = nvme_command_effects(ctrl, ns, req->cmd->common.opcode); - if (req->p.use_workqueue || effects) { + if (req->p.use_workqueue || + (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))) { INIT_WORK(&req->p.work, nvmet_passthru_execute_cmd_work); req->p.rq = rq; queue_work(nvmet_wq, &req->p.work); -- 2.35.1