From patchwork Wed Sep 4 12:51:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Sakamoto X-Patchwork-Id: 13790813 Received: from fhigh8-smtp.messagingengine.com (fhigh8-smtp.messagingengine.com [103.168.172.159]) (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 4FBAA1DA0F9; Wed, 4 Sep 2024 12:52:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.168.172.159 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725454326; cv=none; b=Es5kIpAWjen/wHtxzL1OvYtMkn1JdpFvTitIMx+l6WHp2ZeAUtfWZIO+MpKOPHH4u3ez4OooVc/ys/XCg/kcx7GDTDS4kdMA88y3Hz+PuEQgsLY6AosKMY9gfsytSNyG0TX8pWeuER9QKVNHdJcz22g2/HUQNFoVJteL26hmeA0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725454326; c=relaxed/simple; bh=C20p58o23RybaLCy7Uefjz1YpuuKQk3hZiEMinwkUsY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ARl2rFn9pRCLJGKnr4l650L7DaE8lgkVdWnSl9FbXN2CRQNhoMGDRhKXKFRQXkCE9NBfTtK4KUYbBX2kSkEL6a79VBQY4Cc3iDmfgNDA47TPpqyJTFsW78jvzxH3mJylhr4WONvflnXtrz2yw7r+dLjwoxuIn0X2u6AsOsrJZis= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sakamocchi.jp; spf=pass smtp.mailfrom=sakamocchi.jp; dkim=pass (2048-bit key) header.d=sakamocchi.jp header.i=@sakamocchi.jp header.b=M84nyQbf; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=aRZsavbO; arc=none smtp.client-ip=103.168.172.159 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sakamocchi.jp Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sakamocchi.jp Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sakamocchi.jp header.i=@sakamocchi.jp header.b="M84nyQbf"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="aRZsavbO" Received: from phl-compute-07.internal (phl-compute-07.phl.internal [10.202.2.47]) by mailfhigh.phl.internal (Postfix) with ESMTP id 794DE1140186; Wed, 4 Sep 2024 08:52:03 -0400 (EDT) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-07.internal (MEProxy); Wed, 04 Sep 2024 08:52:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sakamocchi.jp; h=cc:cc:content-transfer-encoding:content-type:date:date:from :from:in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=fm1; t=1725454323; x= 1725540723; bh=WazlOufqSk7gZmSGDY67vvnRDePqJMEVBnNj+5hH5Go=; b=M 84nyQbfT9DVLk71D5DyZzift/zyQqs6LglR2vfQl7GmyvW0+6KStvlRKPWvKnXX8 zuci3u9Z2cg81VJ/qvKjKIRfqiJDCSjTmW6ap2q0gWZ79+FhL8laK8M0LOUy3qMR id6iGexfku7Z6aB/TUEI9ajQdQ6Khq1LV0KdeE/gTvA4GXMGLBoxDKxJKHJS7HIP 28+oPFsOqRxyMqA9gOtCpYwkZCpw1HjP51b4JDEJZKqGwpiE1WONw+v28oY8lPzc y2uRrM4hA4mCot6/LaTPb5E/KtnP2/k6eRm8mTj66bq2OEbtQfJkmq6vjScMl0Ql 8PJZA8JDYP96lClJoioOA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:feedback-id:feedback-id:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t=1725454323; x= 1725540723; bh=WazlOufqSk7gZmSGDY67vvnRDePqJMEVBnNj+5hH5Go=; b=a RZsavbOtIbE5IXMDIDzWn88MPILbsCjfbnfJeB0GCvCVEQ4rQ4Xy9X7lqea/JRZs OZF7w+P/bBZpRCh8PsGQJIx/tIYUCCBBItiRnQJ53MgeWjlfDDtizuKm70VAhudE ytCdki4g8ym4t8hcvOxg2u70b9Pgox1AhkVg6x5QFmLWeyxXnCUP5xDZ8X9ga+3a KhXyixPsUwfJN1Jrlgp5e2EtFklIz/UnRZO86PNMszujo/yLaXIuM6E8t108a4F7 Q0FvqexTHlavFEBcs4OFiuoD13EaSzc/DBZR3k4+jqaUn21EOsN6n0QfzvzxKOv/ Gc1EpFdqe+jUYEaZkdIPA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeftddrudehjedgheeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucenucfjughrpefhvfevuf ffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpefvrghkrghshhhiucfurghkrghm ohhtohcuoehoqdhtrghkrghshhhisehsrghkrghmohgttghhihdrjhhpqeenucggtffrrg htthgvrhhnpedvjefgjeeuvdfguddukeelveetgfdtvefhtdfffeeigfevueetffeivdff kedvtdenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpe hoqdhtrghkrghshhhisehsrghkrghmohgttghhihdrjhhppdhnsggprhgtphhtthhopeej pdhmohguvgepshhmthhpohhuthdprhgtphhtthhopehtihifrghisehsuhhsvgdruggvpd hrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhg pdhrtghpthhtoheplhhinhhugidqshhouhhnugesvhhgvghrrdhkvghrnhgvlhdrohhrgh dprhgtphhtthhopegrphgrihhssehlihhnuhigrdhmihgtrhhoshhofhhtrdgtohhmpdhr tghpthhtohepvggumhhunhgurdhrrghilhgvsehprhhothhonhhmrghilhdrtghomhdprh gtphhtthhopehlihhnuhigqdhmvgguihgrsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhr tghpthhtohepnhgvthguvghvsehvghgvrhdrkhgvrhhnvghlrdhorhhg X-ME-Proxy: Feedback-ID: ie8e14432:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 4 Sep 2024 08:52:01 -0400 (EDT) From: Takashi Sakamoto To: tiwai@suse.de, linux-kernel@vger.kernel.org Cc: linux-sound@vger.kernel.org, apais@linux.microsoft.com, edmund.raile@protonmail.com, linux-media@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 1/5] firewire: core: allocate workqueue to handle isochronous contexts in card Date: Wed, 4 Sep 2024 21:51:50 +0900 Message-ID: <20240904125155.461886-2-o-takashi@sakamocchi.jp> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240904125155.461886-1-o-takashi@sakamocchi.jp> References: <20240904125155.461886-1-o-takashi@sakamocchi.jp> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This commit adds a workqueue dedicated for isochronous context processing. The workqueue is allocated per instance of fw_card structure to satisfy the following characteristics descending from 1394 OHCI specification: In 1394 OHCI specification, memory pages are reserved to each isochronous context dedicated to DMA transmission. It allows to operate these per-context pages concurrently. Software can schedule hardware interrupt for several isochronous context to the same cycle, thus WQ_UNBOUND is specified. Additionally, it is sleepable to operate the content of pages, thus WQ_BH is not used. The isochronous context delivers the packets with time stamp, thus WQ_HIGHPRI is specified for semi real-time data such as IEC 61883-1/6 protocol implemented by ALSA firewire stack. The isochronous context is not used by the implementation of SCSI over IEEE1394 protocol (sbp2), thus WQ_MEM_RECLAIM is not specified. It is useful for users to adjust cpu affinity of the workqueue depending on their work loads, thus WQ_SYS is specified to expose the attributes to user space. Signed-off-by: Takashi Sakamoto --- drivers/firewire/core-card.c | 33 ++++++++++++++++++++++++++++++--- drivers/firewire/core.h | 4 ++-- drivers/firewire/ohci.c | 2 +- include/linux/firewire.h | 2 ++ 4 files changed, 35 insertions(+), 6 deletions(-) diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index e80b762888fa..01354b9de8b2 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -571,11 +571,30 @@ void fw_card_initialize(struct fw_card *card, } EXPORT_SYMBOL(fw_card_initialize); -int fw_card_add(struct fw_card *card, - u32 max_receive, u32 link_speed, u64 guid) +int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid, + unsigned int supported_isoc_contexts) { + struct workqueue_struct *isoc_wq; int ret; + // This workqueue should be: + // * != WQ_BH Sleepable. + // * == WQ_UNBOUND Any core can process data for isoc context. The + // implementation of unit protocol could consumes the core + // longer somehow. + // * != WQ_MEM_RECLAIM Not used for any backend of block device. + // * == WQ_FREEZABLE Isochronous communication is at regular interval in real + // time, thus should be drained if possible at freeze phase. + // * == WQ_HIGHPRI High priority to process semi-realtime timestamped data. + // * == WQ_SYSFS Parameters are available via sysfs. + // * max_active == n_it + n_ir A hardIRQ could notify events for multiple isochronous + // contexts if they are scheduled to the same cycle. + isoc_wq = alloc_workqueue("firewire-isoc-card%u", + WQ_UNBOUND | WQ_FREEZABLE | WQ_HIGHPRI | WQ_SYSFS, + supported_isoc_contexts, card->index); + if (!isoc_wq) + return -ENOMEM; + card->max_receive = max_receive; card->link_speed = link_speed; card->guid = guid; @@ -584,9 +603,12 @@ int fw_card_add(struct fw_card *card, generate_config_rom(card, tmp_config_rom); ret = card->driver->enable(card, tmp_config_rom, config_rom_length); - if (ret < 0) + if (ret < 0) { + destroy_workqueue(isoc_wq); return ret; + } + card->isoc_wq = isoc_wq; list_add_tail(&card->link, &card_list); return 0; @@ -708,6 +730,8 @@ void fw_core_remove_card(struct fw_card *card) { struct fw_card_driver dummy_driver = dummy_driver_template; + might_sleep(); + card->driver->update_phy_reg(card, 4, PHY_LINK_ACTIVE | PHY_CONTENDER, 0); fw_schedule_bus_reset(card, false, true); @@ -719,6 +743,7 @@ void fw_core_remove_card(struct fw_card *card) dummy_driver.free_iso_context = card->driver->free_iso_context; dummy_driver.stop_iso = card->driver->stop_iso; card->driver = &dummy_driver; + drain_workqueue(card->isoc_wq); scoped_guard(spinlock_irqsave, &card->lock) fw_destroy_nodes(card); @@ -727,6 +752,8 @@ void fw_core_remove_card(struct fw_card *card) fw_card_put(card); wait_for_completion(&card->done); + destroy_workqueue(card->isoc_wq); + WARN_ON(!list_empty(&card->transaction_list)); } EXPORT_SYMBOL(fw_core_remove_card); diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index 57d101c01e36..96ae366889e0 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -115,8 +115,8 @@ struct fw_card_driver { void fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver, struct device *device); -int fw_card_add(struct fw_card *card, - u32 max_receive, u32 link_speed, u64 guid); +int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid, + unsigned int supported_isoc_contexts); void fw_core_remove_card(struct fw_card *card); int fw_compute_block_crc(__be32 *block); void fw_schedule_bm_work(struct fw_card *card, unsigned long delay); diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 3930fdd56155..50627b8fc38f 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -3827,7 +3827,7 @@ static int pci_probe(struct pci_dev *dev, goto fail_msi; } - err = fw_card_add(&ohci->card, max_receive, link_speed, guid); + err = fw_card_add(&ohci->card, max_receive, link_speed, guid, ohci->n_it + ohci->n_ir); if (err) goto fail_irq; diff --git a/include/linux/firewire.h b/include/linux/firewire.h index 1cca14cf5652..10e135d60824 100644 --- a/include/linux/firewire.h +++ b/include/linux/firewire.h @@ -134,6 +134,8 @@ struct fw_card { __be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4]; __be32 maint_utility_register; + + struct workqueue_struct *isoc_wq; }; static inline struct fw_card *fw_card_get(struct fw_card *card)