From patchwork Tue May 27 23:01:27 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uday Shankar X-Patchwork-Id: 893061 Received: from mail-pl1-f226.google.com (mail-pl1-f226.google.com [209.85.214.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B9605215F6C for ; Tue, 27 May 2025 23:01:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.226 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748386900; cv=none; b=JvOE2uc3JJ//ALaYpVMWKTnHwgoKT0454T7OPx28TS4QnwJvrHe3PrHyXN6BP/rJ82bUN4b9bg350L/waR/aWrFISTUCGo2pYvVlTY1fd54Vo8i7DQ1Rf/EllyqIkx+oLQRLL7RQ5t3ja/L6vtr99ZQhn3a37p7T9SclOpVa494= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748386900; c=relaxed/simple; bh=EKaGxiLerpvAhaoj/Bkw2+Qa/D3Fb5aNXt+5i9rRtAc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=vGe0c19UiDIjSRkW7qq6MQjApSxaflOssPFTsbjkp0IdLX+Sv1jzJY8pemn6AyktqYElJ+pOl2MUs7k/z9KZBJEb+wH97/KIVD7uQKVzgvKjhk0DwdNKvYj6yap6SZUZpyTRcmAHBnu00Fo5CbD0KDi8a/ydfsThvkUPNe0TKXw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=purestorage.com; spf=fail smtp.mailfrom=purestorage.com; dkim=pass (2048-bit key) header.d=purestorage.com header.i=@purestorage.com header.b=O1opTv1r; arc=none smtp.client-ip=209.85.214.226 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=purestorage.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=purestorage.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=purestorage.com header.i=@purestorage.com header.b="O1opTv1r" Received: by mail-pl1-f226.google.com with SMTP id d9443c01a7336-234ade5a819so10036505ad.1 for ; Tue, 27 May 2025 16:01:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=purestorage.com; s=google2022; t=1748386897; x=1748991697; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=s61w6nBl3jhK5oE1Pz/G6m687SNZu5Nj6nJhmHdEi4Y=; b=O1opTv1rmY4/cbKJhoPN3MI/RrIOBddeSNqdh9nkGQ4cEITkISvI/VmZvSIuHSeCVm OdscQs6XDjckCA1HF+CK5kjhPCDnFrkMbzBQ/lGqyeeoKuAL+AeJp/dNz7HVVhg5IY+y 0vaJwRVZ//g0YbXqWf1lVaqEEbZQdgTuV6z9h0I91KrxnRzPEq7raPUStIwp3OvNgZrB vd2OGA39NB2mfCLUC+9xWutaHB4i/RZy1dLgQcKR2PmQ/+6m+NvpHOiwCNQ2hvq+1evo fqXiqqv+7ZnD2JeahPUeqE9tbygLUWD6KFEuWeCzeDt9nYUtlzK2J5fOWnPwXII8mzgJ xK7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748386897; x=1748991697; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=s61w6nBl3jhK5oE1Pz/G6m687SNZu5Nj6nJhmHdEi4Y=; b=Zpxb4VciW+OinJftNdN+D3/PNU05t2FsPJMWEpwsznFhVM/SOX7+FD0YibrKXCZZ2M lT2jLd3YWJHWSZRM1yGCZj2MFUkNVGh1ycF2b3bznYwclG0vdMEBbR1YuGNftm5R6O4x yhrFwSwiql/H6KPXvNbfjPnJ6yUcg3Kkj1KkfCZHTZ9jrgr9myggsZTtLsGrwaIQ2WVj o59jM9LiEwmSuVSWTjiY+VCxcw5KozIFSmqPCb6tANhXDo1hROkicB6auxsioj9Uzh5J eIDix5Kyi5W4keeJsR9/lqB+dyI7TKJDyheD2oZ7gL2pqllaKoFElteYS9sGfLds35RK XZag== X-Forwarded-Encrypted: i=1; AJvYcCWsj+V34kCS/f3f3FJiAdVJSC/CgMkYICt3h+Nt2IegNK8FahqyOlbOBeuYTm9/arryPGYFISTQor3HSkrDR9k=@vger.kernel.org X-Gm-Message-State: AOJu0YwVl2O7mcHlwtlk/Ievfk3mV1cJkvU3l8+5DGjh57st1KUgZHZM xO9plB6jbJMC8FvS1dtjojMQB0irIIWnp4dPjIjkwLhMPrE04dZESt6SlOMX6h+bpMkmdbYYQ74 QC37Z8jYw+ygDQvxt9mTztLIRO0ajADqLp4Nb X-Gm-Gg: ASbGncvgVFQC/vXnOP9muy7tJzQrRGyalwAuZ3IpCEHI6lqQsV35U2FlwhI9ogve64c 2/1fWTFhG9uMrdiZ5HVu8+31/eOF38YNLCYbKyV5DWqhvkibpK2tFS+tTgmYJwQfEjGbn1Dow8E i3UcBKGxxkL3Yv9t8+GwFFxYnhaB9mLdH/RQo901qY38JxJkWEk4Pxtn02cCzG1w58LoGYnw4Ut 6R/aofmL5dOJgxpj1SKVkPwW5zomPFPS8D0Xmr+w1NpNhhZRSJluLIcDr3IWGQTYKdittIxvagx TKteWeZGjX4+o3VoTpyQ26rRtzQSd/3TxcBHG/ADkxf9BQ== X-Google-Smtp-Source: AGHT+IHBgJnJ4t0ZHX1cK5i/ctstGNjkLaCfd1pbaD7diiQqvXBHGlDnwc++pxUSmXvdZ73tM7RbAeZq21nh X-Received: by 2002:a17:902:e842:b0:22e:4a2e:8ae7 with SMTP id d9443c01a7336-23414f7d0ebmr273932075ad.22.1748386896905; Tue, 27 May 2025 16:01:36 -0700 (PDT) Received: from c7-smtp-2023.dev.purestorage.com ([208.88.159.129]) by smtp-relay.gmail.com with ESMTPS id 41be03b00d2f7-b2d99e19562sm314a12.12.2025.05.27.16.01.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 May 2025 16:01:36 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-ushankar.dev.purestorage.com (dev-ushankar.dev.purestorage.com [IPv6:2620:125:9007:640:7:70:36:0]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 31E01340353; Tue, 27 May 2025 17:01:36 -0600 (MDT) Received: by dev-ushankar.dev.purestorage.com (Postfix, from userid 1557716368) id 2E59AE539B9; Tue, 27 May 2025 17:01:36 -0600 (MDT) From: Uday Shankar Date: Tue, 27 May 2025 17:01:27 -0600 Subject: [PATCH v7 4/8] selftests: ublk: kublk: lift queue initialization out of thread Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250527-ublk_task_per_io-v7-4-cbdbaf283baa@purestorage.com> References: <20250527-ublk_task_per_io-v7-0-cbdbaf283baa@purestorage.com> In-Reply-To: <20250527-ublk_task_per_io-v7-0-cbdbaf283baa@purestorage.com> To: Ming Lei , Jens Axboe , Caleb Sander Mateos , Andrew Morton , Shuah Khan , Jonathan Corbet Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Uday Shankar X-Mailer: b4 0.14.2 Currently, each ublk server I/O handler thread initializes its own queue. However, as we move towards decoupled ublk_queues and ublk server threads, this model does not make sense anymore, as there will no longer be a concept of a thread having "its own" queue. So lift queue initialization out of the per-thread ublk_io_handler_fn and into a loop in ublk_start_daemon (which runs once for each device). There is a part of ublk_queue_init (ring initialization) which does actually need to happen on the thread that will use the ring; that is separated into a separate ublk_thread_init which is still called by each I/O handler thread. Signed-off-by: Uday Shankar Reviewed-by: Ming Lei --- tools/testing/selftests/ublk/kublk.c | 68 +++++++++++++++++++++++++----------- 1 file changed, 47 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/ublk/kublk.c b/tools/testing/selftests/ublk/kublk.c index 1602cf6f07a02e5dab293b91f301218c38c8f4d9..2d6d163b74483a07066f47fd36781782ce25a16e 100644 --- a/tools/testing/selftests/ublk/kublk.c +++ b/tools/testing/selftests/ublk/kublk.c @@ -412,6 +412,17 @@ static void ublk_queue_deinit(struct ublk_queue *q) int i; int nr_ios = q->q_depth; + if (q->io_cmd_buf) + munmap(q->io_cmd_buf, ublk_queue_cmd_buf_sz(q)); + + for (i = 0; i < nr_ios; i++) + free(q->ios[i].buf_addr); +} + +static void ublk_thread_deinit(struct ublk_queue *q) +{ + q->tid = 0; + io_uring_unregister_buffers(&q->ring); io_uring_unregister_ring_fd(&q->ring); @@ -421,28 +432,20 @@ static void ublk_queue_deinit(struct ublk_queue *q) close(q->ring.ring_fd); q->ring.ring_fd = -1; } - - if (q->io_cmd_buf) - munmap(q->io_cmd_buf, ublk_queue_cmd_buf_sz(q)); - - for (i = 0; i < nr_ios; i++) - free(q->ios[i].buf_addr); } static int ublk_queue_init(struct ublk_queue *q, unsigned extra_flags) { struct ublk_dev *dev = q->dev; int depth = dev->dev_info.queue_depth; - int i, ret = -1; + int i; int cmd_buf_size, io_buf_size; unsigned long off; - int ring_depth = dev->tgt.sq_depth, cq_depth = dev->tgt.cq_depth; q->tgt_ops = dev->tgt.ops; q->state = 0; q->q_depth = depth; q->cmd_inflight = 0; - q->tid = gettid(); if (dev->dev_info.flags & (UBLK_F_SUPPORT_ZERO_COPY | UBLK_F_AUTO_BUF_REG)) { q->state |= UBLKSRV_NO_BUF; @@ -479,6 +482,22 @@ static int ublk_queue_init(struct ublk_queue *q, unsigned extra_flags) } } + return 0; + fail: + ublk_queue_deinit(q); + ublk_err("ublk dev %d queue %d failed\n", + dev->dev_info.dev_id, q->q_id); + return -ENOMEM; +} + +static int ublk_thread_init(struct ublk_queue *q) +{ + struct ublk_dev *dev = q->dev; + int ring_depth = dev->tgt.sq_depth, cq_depth = dev->tgt.cq_depth; + int ret; + + q->tid = gettid(); + ret = ublk_setup_ring(&q->ring, ring_depth, cq_depth, IORING_SETUP_COOP_TASKRUN | IORING_SETUP_SINGLE_ISSUER | @@ -508,9 +527,9 @@ static int ublk_queue_init(struct ublk_queue *q, unsigned extra_flags) } return 0; - fail: - ublk_queue_deinit(q); - ublk_err("ublk dev %d queue %d failed\n", +fail: + ublk_thread_deinit(q); + ublk_err("ublk dev %d queue %d thread init failed\n", dev->dev_info.dev_id, q->q_id); return -ENOMEM; } @@ -778,7 +797,6 @@ struct ublk_queue_info { struct ublk_queue *q; sem_t *queue_sem; cpu_set_t *affinity; - unsigned char auto_zc_fallback; }; static void *ublk_io_handler_fn(void *data) @@ -786,15 +804,11 @@ static void *ublk_io_handler_fn(void *data) struct ublk_queue_info *info = data; struct ublk_queue *q = info->q; int dev_id = q->dev->dev_info.dev_id; - unsigned extra_flags = 0; int ret; - if (info->auto_zc_fallback) - extra_flags = UBLKSRV_AUTO_BUF_REG_FALLBACK; - - ret = ublk_queue_init(q, extra_flags); + ret = ublk_thread_init(q); if (ret) { - ublk_err("ublk dev %d queue %d init queue failed\n", + ublk_err("ublk dev %d queue %d thread init failed\n", dev_id, q->q_id); return NULL; } @@ -813,7 +827,7 @@ static void *ublk_io_handler_fn(void *data) } while (1); ublk_dbg(UBLK_DBG_QUEUE, "ublk dev %d queue %d exited\n", dev_id, q->q_id); - ublk_queue_deinit(q); + ublk_thread_deinit(q); return NULL; } @@ -857,6 +871,7 @@ static int ublk_start_daemon(const struct dev_ctx *ctx, struct ublk_dev *dev) { const struct ublksrv_ctrl_dev_info *dinfo = &dev->dev_info; struct ublk_queue_info *qinfo; + unsigned extra_flags = 0; cpu_set_t *affinity_buf; void *thread_ret; sem_t queue_sem; @@ -878,14 +893,23 @@ static int ublk_start_daemon(const struct dev_ctx *ctx, struct ublk_dev *dev) if (ret) return ret; + if (ctx->auto_zc_fallback) + extra_flags = UBLKSRV_AUTO_BUF_REG_FALLBACK; + for (i = 0; i < dinfo->nr_hw_queues; i++) { dev->q[i].dev = dev; dev->q[i].q_id = i; + ret = ublk_queue_init(&dev->q[i], extra_flags); + if (ret) { + ublk_err("ublk dev %d queue %d init queue failed\n", + dinfo->dev_id, i); + goto fail; + } + qinfo[i].q = &dev->q[i]; qinfo[i].queue_sem = &queue_sem; qinfo[i].affinity = &affinity_buf[i]; - qinfo[i].auto_zc_fallback = ctx->auto_zc_fallback; pthread_create(&dev->q[i].thread, NULL, ublk_io_handler_fn, &qinfo[i]); @@ -918,6 +942,8 @@ static int ublk_start_daemon(const struct dev_ctx *ctx, struct ublk_dev *dev) for (i = 0; i < dinfo->nr_hw_queues; i++) pthread_join(dev->q[i].thread, &thread_ret); fail: + for (i = 0; i < dinfo->nr_hw_queues; i++) + ublk_queue_deinit(&dev->q[i]); ublk_dev_unprep(dev); ublk_dbg(UBLK_DBG_DEV, "%s exit\n", __func__);