From patchwork Tue Jan 30 12:23:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 13537493 Received: from aposti.net (aposti.net [89.234.176.197]) (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 B206167E9C; Tue, 30 Jan 2024 12:23:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.234.176.197 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706617440; cv=none; b=NUOu7lHQqmJnEjS3w+D5AajlHIkzFLD1IsrzkVVLdCUe2//MQRZN9aiv6AE0kJHohR5Egx8uhMGWTKXpeKzvZQj3spmE50n8urcDlAUfrHBHg6v3HEumh3vd/u46elOpejjIqqGj3DO8FQllhbQrgWnuUjH37KZsj2b/54SwMzc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706617440; c=relaxed/simple; bh=66FzAt7nJpAY9ka7VMdHoplxE2iQOAZv1WQkaTZVLTI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jNYstDiDeY2lAtcY3BsXlFC2k6xw59IVAIq3RgQ9Bh9kXP2KIyQY7heV35BMYFGZ2ynhKPKI/RsJb0DLN/Vsk2BJkID+yRDYLND1vQeNZbOb6Z0/VUpdbrWfMg1Xl2hBH/1vf0wofzciBj5mTk1S9cbJ7oNADKHBqeU7ilEX7es= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=crapouillou.net; spf=pass smtp.mailfrom=crapouillou.net; dkim=pass (1024-bit key) header.d=crapouillou.net header.i=@crapouillou.net header.b=uStG4m2O; arc=none smtp.client-ip=89.234.176.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=crapouillou.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=crapouillou.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=crapouillou.net header.i=@crapouillou.net header.b="uStG4m2O" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1706617428; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SqXbfp61fzBHWNEqVrElLd46cr7HG/1wYVIvKKSn5jY=; b=uStG4m2OiYDXjAnbZhvlePwi6RCL5a65XfVMHf3kIDQFND4jkC6cwEBz0jaA9AW1MZbf1/ 2u/o3/68rPjN5owEZJ5rGx2hINs1wO31bHkjYDAEEB8LZF+afk4mDgWOr+EQfngv9sqZL3 QFrIivxNGWeocp6JrbECrSQlqQxE4YQ= From: Paul Cercueil To: Greg Kroah-Hartman , Jonathan Corbet , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= Cc: =?utf-8?q?Nuno_S=C3=A1?= , Jonathan Cameron , Michael Hennerich , linux-usb@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Paul Cercueil Subject: [PATCH v6 1/4] usb: gadget: Support already-mapped DMA SGs Date: Tue, 30 Jan 2024 13:23:37 +0100 Message-ID: <20240130122340.54813-2-paul@crapouillou.net> In-Reply-To: <20240130122340.54813-1-paul@crapouillou.net> References: <20240130122340.54813-1-paul@crapouillou.net> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a new 'sg_was_mapped' field to the struct usb_request. This field can be used to indicate that the scatterlist associated to the USB transfer has already been mapped into the DMA space, and it does not have to be done internally. Signed-off-by: Paul Cercueil --- drivers/usb/gadget/udc/core.c | 7 ++++++- include/linux/usb/gadget.h | 2 ++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index d59f94464b87..9d4150124fdb 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -903,6 +903,11 @@ int usb_gadget_map_request_by_dev(struct device *dev, if (req->length == 0) return 0; + if (req->sg_was_mapped) { + req->num_mapped_sgs = req->num_sgs; + return 0; + } + if (req->num_sgs) { int mapped; @@ -948,7 +953,7 @@ EXPORT_SYMBOL_GPL(usb_gadget_map_request); void usb_gadget_unmap_request_by_dev(struct device *dev, struct usb_request *req, int is_in) { - if (req->length == 0) + if (req->length == 0 || req->sg_was_mapped) return; if (req->num_mapped_sgs) { diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index a771ccc038ac..c529e4e06997 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -52,6 +52,7 @@ struct usb_ep; * @short_not_ok: When reading data, makes short packets be * treated as errors (queue stops advancing till cleanup). * @dma_mapped: Indicates if request has been mapped to DMA (internal) + * @sg_was_mapped: Set if the scatterlist has been mapped before the request * @complete: Function called when request completes, so this request and * its buffer may be re-used. The function will always be called with * interrupts disabled, and it must not sleep. @@ -111,6 +112,7 @@ struct usb_request { unsigned zero:1; unsigned short_not_ok:1; unsigned dma_mapped:1; + unsigned sg_was_mapped:1; void (*complete)(struct usb_ep *ep, struct usb_request *req);