From patchwork Fri May 31 07:47:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13681224 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1516DC27C51 for ; Fri, 31 May 2024 07:49:18 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.733342.1139529 (Exim 4.92) (envelope-from ) id 1sCx0W-00052f-LX; Fri, 31 May 2024 07:49:00 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 733342.1139529; Fri, 31 May 2024 07:49:00 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sCx0W-00052Y-Hl; Fri, 31 May 2024 07:49:00 +0000 Received: by outflank-mailman (input) for mailman id 733342; Fri, 31 May 2024 07:48:58 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sCx0U-0004oC-O4 for xen-devel@lists.xenproject.org; Fri, 31 May 2024 07:48:58 +0000 Received: from bombadil.infradead.org (bombadil.infradead.org [2607:7c80:54:3::133]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 3af473f0-1f22-11ef-b4bb-af5377834399; Fri, 31 May 2024 09:48:56 +0200 (CEST) Received: from 2a02-8389-2341-5b80-5ba9-f4da-76fa-44a9.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:5ba9:f4da:76fa:44a9] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sCx0I-00000009XVz-1ERf; Fri, 31 May 2024 07:48:46 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 3af473f0-1f22-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=8qWYYD/WE7sZdc6vKaSwzAcVLajLtvsC2W0WllIXaIM=; b=1A1yb09khg0zzo88GBpLvTFsHc tV8ef2UQ1VXidXvG732ApqmyCupKhGkL5G59GgO8xU8oyRy3a7wLIj5Fqsb7ozie1sIBv/ltIsHYx +btWJXOahq4wAEa2PPIJxwFXAazEivQE/BryJ8mbFTKha/lhrUy32leI2VIH6j6MGV9GQOA2CaiHz ExUMMEXqbTiHF//iRBxcXt5wvKwfJDb8BxMSI0kYUpaS1XbArUgDpnhBV5zsm3WXP9abkponn0rgr g9AmlPK83Uxe92IoHb7Jc1v2oHu4zV0TiIRlrabbLStJXmWX3Wjs0EvPEaMCe032BaHlcz+c/JPQo uvqey7Tw==; From: Christoph Hellwig To: Jens Axboe , "Martin K. Petersen" Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , Josef Bacik , Ilya Dryomov , Dongsheng Yang , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , linux-um@lists.infradead.org, linux-block@vger.kernel.org, nbd@other.debian.org, ceph-devel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org Subject: [PATCH 01/14] ubd: refactor the interrupt handler Date: Fri, 31 May 2024 09:47:56 +0200 Message-ID: <20240531074837.1648501-2-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240531074837.1648501-1-hch@lst.de> References: <20240531074837.1648501-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Instead of a separate handler function that leaves no work in the interrupt hanler itself, split out a per-request end I/O helper and clean up the coding style and variable naming while we're at it. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Acked-By: Anton Ivanov --- arch/um/drivers/ubd_kern.c | 49 ++++++++++++++------------------------ 1 file changed, 18 insertions(+), 31 deletions(-) diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index ef805eaa9e013d..0c9542d58c01b7 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -447,43 +447,30 @@ static int bulk_req_safe_read( return n; } -/* Called without dev->lock held, and only in interrupt context. */ -static void ubd_handler(void) +static void ubd_end_request(struct io_thread_req *io_req) { - int n; - int count; - - while(1){ - n = bulk_req_safe_read( - thread_fd, - irq_req_buffer, - &irq_remainder, - &irq_remainder_size, - UBD_REQ_BUFFER_SIZE - ); - if (n < 0) { - if(n == -EAGAIN) - break; - printk(KERN_ERR "spurious interrupt in ubd_handler, " - "err = %d\n", -n); - return; - } - for (count = 0; count < n/sizeof(struct io_thread_req *); count++) { - struct io_thread_req *io_req = (*irq_req_buffer)[count]; - - if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) { - blk_queue_max_discard_sectors(io_req->req->q, 0); - blk_queue_max_write_zeroes_sectors(io_req->req->q, 0); - } - blk_mq_end_request(io_req->req, io_req->error); - kfree(io_req); - } + if (io_req->error == BLK_STS_NOTSUPP && + req_op(io_req->req) == REQ_OP_DISCARD) { + blk_queue_max_discard_sectors(io_req->req->q, 0); + blk_queue_max_write_zeroes_sectors(io_req->req->q, 0); } + blk_mq_end_request(io_req->req, io_req->error); + kfree(io_req); } static irqreturn_t ubd_intr(int irq, void *dev) { - ubd_handler(); + int len, i; + + while ((len = bulk_req_safe_read(thread_fd, irq_req_buffer, + &irq_remainder, &irq_remainder_size, + UBD_REQ_BUFFER_SIZE)) >= 0) { + for (i = 0; i < len / sizeof(struct io_thread_req *); i++) + ubd_end_request((*irq_req_buffer)[i]); + } + + if (len < 0 && len != -EAGAIN) + pr_err("spurious interrupt in %s, err = %d\n", __func__, len); return IRQ_HANDLED; }