From patchwork Sat Jun 22 23:48:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 806888 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (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 02AD34C8A for ; Sat, 22 Jun 2024 23:48:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719100126; cv=none; b=dpwSSVIsBqwdFt2/DatmmW/dXS78njmRpqAtD4xdL/fj3ePszE6TbPcUFp7viTi1oZ4i+RhZ7srJacmo3i2huN0A2Q1CtJAoGXUNSgB23yxNYobaIrUs6Tuue8KQh9bplptMpjJzlpi5nw/J3G1bmgQKnDmkCuKqqp68C3szJiM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719100126; c=relaxed/simple; bh=zvzna6niCULIOsf1krFO6xX5xTvSU+BBkHM8O4pKRro=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=nsPnlRNfVyK5B5O+eVPCC9efNPkB/Tt1pgOGNluef+xT9QxR1vgdmrnGybG/nJQDco5Xzxdej+RxZOL8pw8lVok2NipxOhRN5rAVIeGoMcanG9pie3AG/4w67bOeivhA9n5DrR0N9G6qe5wk8MFfZxYt47uQmFkTXeASACEePQM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sLATD-0002cf-5F; Sun, 23 Jun 2024 01:48:35 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sLATC-004Hkc-Gv; Sun, 23 Jun 2024 01:48:34 +0200 Received: from localhost ([::1] helo=dude04.red.stw.pengutronix.de) by dude04.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1sLATC-000IWx-35; Sun, 23 Jun 2024 01:48:34 +0200 From: Michael Grzeschik Date: Sun, 23 Jun 2024 01:48:29 +0200 Subject: [PATCH v2 1/3] usb: gadget: function: uvc: set req_size once when the vb2 queue is calculated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240403-uvc_request_length_by_interval-v2-1-12690f7a2eff@pengutronix.de> References: <20240403-uvc_request_length_by_interval-v2-0-12690f7a2eff@pengutronix.de> In-Reply-To: <20240403-uvc_request_length_by_interval-v2-0-12690f7a2eff@pengutronix.de> To: Laurent Pinchart , Daniel Scally , Greg Kroah-Hartman , Avichal Rakesh Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Grzeschik X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3232; i=m.grzeschik@pengutronix.de; h=from:subject:message-id; bh=zvzna6niCULIOsf1krFO6xX5xTvSU+BBkHM8O4pKRro=; b=owEBbQKS/ZANAwAKAb9pWET5cfSrAcsmYgBmd2LRzov2p04A9MUzQour0vyAA+sYkI5LzSBaW 2zEThFiKvqJAjMEAAEKAB0WIQQV2+2Fpbqd6fvv0Gi/aVhE+XH0qwUCZndi0QAKCRC/aVhE+XH0 q3AID/4oWCCa5ep7GqbbfBiSNExY4njozZKlHwyji4J+P1MtmqLp1B/KNR7HefOKF+0yvVhggqs bfcKpDH9NpTldVJAMAXS4T4a47JgNjhHYUHgBwQ1jhdw0qsMsuEta/SWaLwE5TxOCCGTintLIz+ PxJ60SBNej+m3oxgfQbwX6czlKv75aLk2UQ572IezV2XnubTLhcBwphgkKrG2GSj6BdOfGo5Pzi TC6qYAIHEgMtS5CV2A+cw1Ht+q3W1YNC+xkRKZMPbcc3zQ0yZkmfYG14Zh6P0Dl64X6Y9TPHmhl dDe0f/X+4FLbRht0BNapul1+RfIB/ZsiLNYrblZqPUewvQsMCR6+YoAU0sQgrpckcPeLS4+s0ca KMsd9UvTzRU84bvUE8611PN885B/FCBbrHhA6lgiPDZgTNgvpp2/kEb0e7J2ICk2gRjJDGQHMZQ T0Y2TUNXi1YaECQMbNDA3rfX7HvnDwh3vOGX8hLnmGIv4vaHXEDP2NKXSQ8cq3uW01/PdoWp5uy bYIhLLTiikGqMZl/RKkVwtQJQnaHSAjdZ5mJAEcOpkPZDbvarPPALZ0uamfW5E+G+jwS7+NCS0J vp7jC0kDgt1pWW2dXSBIIP80oTlXUD6C3omCibURyAD9F/YVhCRKLhfEQugOQu2HysVTiXGVfRY +OgLsrgx4yv+8TA== X-Developer-Key: i=m.grzeschik@pengutronix.de; a=openpgp; fpr=957BC452CE953D7EA60CF4FC0BE9E3157A1E2C64 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: m.grzeschik@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org The uvc gadget driver is calculating the req_size on every video_enable/alloc_request and is based on the fixed configfs parameters maxpacket, maxburst and mult. As those parameters can not be changed once the gadget is started and the same calculation is done already early on the vb2_streamon/queue_setup path its save to remove one extra calculation and reuse the calculation from uvc_queue_setup for the allocation step. Signed-off-by: Michael Grzeschik --- Link to v1: https://lore.kernel.org/r/20240404-uvc_request_calc_once-v1-1-fea7fd8f0496@pengutronix.de v1 -> v2: - --- drivers/usb/gadget/function/uvc_queue.c | 2 ++ drivers/usb/gadget/function/uvc_video.c | 15 ++------------- 2 files changed, 4 insertions(+), 13 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c index 0aa3d7e1f3cc3..ce51643fc4639 100644 --- a/drivers/usb/gadget/function/uvc_queue.c +++ b/drivers/usb/gadget/function/uvc_queue.c @@ -63,6 +63,8 @@ static int uvc_queue_setup(struct vb2_queue *vq, */ nreq = DIV_ROUND_UP(DIV_ROUND_UP(sizes[0], 2), req_size); nreq = clamp(nreq, 4U, 64U); + + video->req_size = req_size; video->uvc_num_requests = nreq; return 0; diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index d41f5f31dadd5..95bb64e16f3da 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -496,7 +496,6 @@ uvc_video_free_requests(struct uvc_video *video) INIT_LIST_HEAD(&video->ureqs); INIT_LIST_HEAD(&video->req_free); INIT_LIST_HEAD(&video->req_ready); - video->req_size = 0; return 0; } @@ -504,16 +503,9 @@ static int uvc_video_alloc_requests(struct uvc_video *video) { struct uvc_request *ureq; - unsigned int req_size; unsigned int i; int ret = -ENOMEM; - BUG_ON(video->req_size); - - req_size = video->ep->maxpacket - * max_t(unsigned int, video->ep->maxburst, 1) - * (video->ep->mult); - for (i = 0; i < video->uvc_num_requests; i++) { ureq = kzalloc(sizeof(struct uvc_request), GFP_KERNEL); if (ureq == NULL) @@ -523,7 +515,7 @@ uvc_video_alloc_requests(struct uvc_video *video) list_add_tail(&ureq->list, &video->ureqs); - ureq->req_buffer = kmalloc(req_size, GFP_KERNEL); + ureq->req_buffer = kmalloc(video->req_size, GFP_KERNEL); if (ureq->req_buffer == NULL) goto error; @@ -541,12 +533,10 @@ uvc_video_alloc_requests(struct uvc_video *video) list_add_tail(&ureq->req->list, &video->req_free); /* req_size/PAGE_SIZE + 1 for overruns and + 1 for header */ sg_alloc_table(&ureq->sgt, - DIV_ROUND_UP(req_size - UVCG_REQUEST_HEADER_LEN, + DIV_ROUND_UP(video->req_size - UVCG_REQUEST_HEADER_LEN, PAGE_SIZE) + 2, GFP_KERNEL); } - video->req_size = req_size; - return 0; error: @@ -699,7 +689,6 @@ uvcg_video_disable(struct uvc_video *video) INIT_LIST_HEAD(&video->ureqs); INIT_LIST_HEAD(&video->req_free); INIT_LIST_HEAD(&video->req_ready); - video->req_size = 0; spin_unlock_irqrestore(&video->req_lock, flags); /*