From patchwork Sun Oct 8 22:49:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xabier Marquiegui X-Patchwork-Id: 13412817 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 83BF83419A for ; Sun, 8 Oct 2023 22:49:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NRaN8zV0" Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EBFAA6 for ; Sun, 8 Oct 2023 15:49:34 -0700 (PDT) Received: by mail-wm1-x32e.google.com with SMTP id 5b1f17b1804b1-40572aeb6d0so37192715e9.1 for ; Sun, 08 Oct 2023 15:49:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696805372; x=1697410172; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=W/nnP9l32LjqLFh8TKMytsH+qE574lmTYdTAz8rjZUM=; b=NRaN8zV0QDmu7i9qQbuAX/NB+UJh3F3vpC+ckCryZ6dXu9BSGZE4EKM78VXk5SJVxn PwQVUwhLybqohQ35bQgDlD6dyTjXpFaA/CcgzYHmCrUScyNMFGybkfNDlPYxzv7/k7/0 aq6Zl9uO0qZe6rhS/4CogmaAgP36q85k3NMuJXtLTbaZMOJw1HBlobFky2GE1h1rCs1T Vzg7iQW2+T9bReqbgXDYQ7J4U9a+ei/b9vb3eqJHL0ONkQOJ4wJkc6G3D9LzNI1l6kIw WSGFFGKCAX9EqNfxwNHIK17whaT9X4wtoNM5N38yPlKAjhdQjf2o1u3H0kZGk7q2V3Ys 83Nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696805372; x=1697410172; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=W/nnP9l32LjqLFh8TKMytsH+qE574lmTYdTAz8rjZUM=; b=gvzVyZ325+Ug6xyUaPLPrnmhzbhPSP4kH4PpWui6MA8Pn4lQZVpe2AXyH0rTh7tkB/ TmI0OcQ5/yoHoxB1LJxsn60N8Wkzp5YK9g7QOdhakGOc5vtbjTm+SdqZ4Etsr3uMTUAR UCGY+1zD3VCo2j2y1r3wD7b1qcrVm8EVkOYX6nZaplIiju+BcygQasAJzl99bF7Ky8Ru z8TKHIL6JiPRchLLPyt9pYdoA5KcTZyXCriUv+8gMRQX8AgvPum8cJJCWKwz8Km2oIOi tfoyZpZ36aN5AeDmYpxv3op1iQymOvHaTjfD62cdXs0ll88wf0orHKRedeeLGwgeCH/i LgdQ== X-Gm-Message-State: AOJu0Yyp47qHGJjmqFOSbF4fW5f3rw7YDOIj+evHb5lizWbu52ixgGWR IFOWKNAIsqrNP3q7yartFRL4znLNxb9tYw== X-Google-Smtp-Source: AGHT+IE57CK4QIVfR9wG9cI7AuMnFFvxFibhEL4Us8kqvW/GBXXzzB+XINwJE1SEHAgehHoNbAhziw== X-Received: by 2002:a7b:c84d:0:b0:3fa:934c:8356 with SMTP id c13-20020a7bc84d000000b003fa934c8356mr13084684wml.10.1696805372056; Sun, 08 Oct 2023 15:49:32 -0700 (PDT) Received: from reibax-minipc.lan ([2a0c:5a80:3e06:7600::978]) by smtp.gmail.com with ESMTPSA id 6-20020a05600c22c600b0040303a9965asm11804891wmg.40.2023.10.08.15.49.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Oct 2023 15:49:31 -0700 (PDT) From: Xabier Marquiegui To: netdev@vger.kernel.org Cc: richardcochran@gmail.com, tglx@linutronix.de, jstultz@google.com, horms@kernel.org, chrony-dev@chrony.tuxfamily.org, mlichvar@redhat.com, reibax@gmail.com, ntp-lists@mattcorallo.com, vinicius.gomes@intel.com, davem@davemloft.net, rrameshbabu@nvidia.com, shuah@kernel.org Subject: [PATCH net-next v5 2/6] ptp: Replace timestamp event queue with linked list Date: Mon, 9 Oct 2023 00:49:17 +0200 Message-Id: X-Mailer: git-send-email 2.30.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Introduce linked lists to access the timestamp event queue. Signed-off-by: Xabier Marquiegui Suggested-by: Richard Cochran --- v4: https://lore.kernel.org/netdev/a0aaf9c5347ea05deb8153511294676bc46f63d8.1696511486.git.reibax@gmail.com/ - simpler queue clean procedure - fix/clean comment lines v3: https://lore.kernel.org/netdev/20230928133544.3642650-2-reibax@gmail.com/ - fix use of safe and non safe linked lists for loops v2: https://lore.kernel.org/netdev/20230912220217.2008895-1-reibax@gmail.com/ - Style changes to comform to checkpatch strict suggestions v1: https://lore.kernel.org/netdev/20230906104754.1324412-2-reibax@gmail.com/ --- drivers/ptp/ptp_chardev.c | 12 ++++++++++-- drivers/ptp/ptp_clock.c | 26 ++++++++++++++++++++++++-- drivers/ptp/ptp_private.h | 4 +++- drivers/ptp/ptp_sysfs.c | 6 +++++- 4 files changed, 42 insertions(+), 6 deletions(-) diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index 0ba3e7064df2..aa1990d2ab46 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -439,10 +439,14 @@ __poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp, { struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock); + struct timestamp_event_queue *queue; poll_wait(fp, &ptp->tsev_wq, wait); - return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0; + /* Extract only the first element in the queue list */ + queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue, qlist); + + return queue_cnt(queue) ? EPOLLIN : 0; } #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) @@ -452,12 +456,16 @@ ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags, { struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock); - struct timestamp_event_queue *queue = &ptp->tsevq; + struct timestamp_event_queue *queue; struct ptp_extts_event *event; unsigned long flags; size_t qcnt, i; int result; + /* Extract only the first element in the queue list */ + queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue, + qlist); + if (cnt % sizeof(struct ptp_extts_event) != 0) return -EINVAL; diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index 80f74e38c2da..157ef25bc1b1 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -169,12 +169,21 @@ static struct posix_clock_operations ptp_clock_ops = { static void ptp_clock_release(struct device *dev) { struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev); + struct timestamp_event_queue *tsevq; + unsigned long flags; ptp_cleanup_pin_groups(ptp); kfree(ptp->vclock_index); mutex_destroy(&ptp->tsevq_mux); mutex_destroy(&ptp->pincfg_mux); mutex_destroy(&ptp->n_vclocks_mux); + /* Delete first entry */ + tsevq = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue, + qlist); + spin_lock_irqsave(&tsevq->lock, flags); + list_del(&tsevq->qlist); + spin_unlock_irqrestore(&tsevq->lock, flags); + kfree(tsevq); ida_free(&ptp_clocks_map, ptp->index); kfree(ptp); } @@ -206,6 +215,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, struct device *parent) { struct ptp_clock *ptp; + struct timestamp_event_queue *queue = NULL; int err = 0, index, major = MAJOR(ptp_devt); size_t size; @@ -228,7 +238,12 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, ptp->info = info; ptp->devid = MKDEV(major, index); ptp->index = index; - spin_lock_init(&ptp->tsevq.lock); + INIT_LIST_HEAD(&ptp->tsevqs); + queue = kzalloc(sizeof(*queue), GFP_KERNEL); + if (!queue) + goto no_memory_queue; + spin_lock_init(&queue->lock); + list_add_tail(&queue->qlist, &ptp->tsevqs); mutex_init(&ptp->tsevq_mux); mutex_init(&ptp->pincfg_mux); mutex_init(&ptp->n_vclocks_mux); @@ -333,6 +348,9 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, mutex_destroy(&ptp->tsevq_mux); mutex_destroy(&ptp->pincfg_mux); mutex_destroy(&ptp->n_vclocks_mux); + list_del(&queue->qlist); + kfree(queue); +no_memory_queue: ida_free(&ptp_clocks_map, index); no_slot: kfree(ptp); @@ -375,6 +393,7 @@ EXPORT_SYMBOL(ptp_clock_unregister); void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event) { + struct timestamp_event_queue *tsevq; struct pps_event_time evt; switch (event->type) { @@ -383,7 +402,10 @@ void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event) break; case PTP_CLOCK_EXTTS: - enqueue_external_timestamp(&ptp->tsevq, event); + /* Enqueue timestamp on all queues */ + list_for_each_entry(tsevq, &ptp->tsevqs, qlist) { + enqueue_external_timestamp(tsevq, event); + } wake_up_interruptible(&ptp->tsev_wq); break; diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h index a3110c85f694..cc8186a92eec 100644 --- a/drivers/ptp/ptp_private.h +++ b/drivers/ptp/ptp_private.h @@ -15,6 +15,7 @@ #include #include #include +#include #define PTP_MAX_TIMESTAMPS 128 #define PTP_BUF_TIMESTAMPS 30 @@ -25,6 +26,7 @@ struct timestamp_event_queue { int head; int tail; spinlock_t lock; + struct list_head qlist; }; struct ptp_clock { @@ -35,7 +37,7 @@ struct ptp_clock { int index; /* index into clocks.map */ struct pps_device *pps_source; long dialed_frequency; /* remembers the frequency adjustment */ - struct timestamp_event_queue tsevq; /* simple fifo for time stamps */ + struct list_head tsevqs; /* timestamp fifo list */ struct mutex tsevq_mux; /* one process at a time reading the fifo */ struct mutex pincfg_mux; /* protect concurrent info->pin_config access */ wait_queue_head_t tsev_wq; diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c index 6e4d5456a885..2675f383cd0a 100644 --- a/drivers/ptp/ptp_sysfs.c +++ b/drivers/ptp/ptp_sysfs.c @@ -75,12 +75,16 @@ static ssize_t extts_fifo_show(struct device *dev, struct device_attribute *attr, char *page) { struct ptp_clock *ptp = dev_get_drvdata(dev); - struct timestamp_event_queue *queue = &ptp->tsevq; + struct timestamp_event_queue *queue; struct ptp_extts_event event; unsigned long flags; size_t qcnt; int cnt = 0; + /* The sysfs fifo will always draw from the fist queue */ + queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue, + qlist); + memset(&event, 0, sizeof(event)); if (mutex_lock_interruptible(&ptp->tsevq_mux))