From nobody Tue Dec 23 19:56:03 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 EBA6338387 for ; Wed, 31 Jan 2024 19:17:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706728680; cv=none; b=p9W+Xf44pGPjBN3jL1bz8o63kvlzJiezz4bLeUIS6pQPxnSpdy5w4B+of9i6mRAB7K7lkksrwEOeT4vbUUTQDvyY2q0zd+aq/KpwrncnCwsofd84Z0r4RjxMV/2VyiEKAZthRFbHrIRqE5DjmmRaYNbFP5MsEGarfOSMnGVrZLA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706728680; c=relaxed/simple; bh=2DnmIvdGmjURmShJtRCsEJMDdPmjxWUH1IKPlXRajfM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IINaTiFGB3zegt8ok+tNINp+Rgmo6hAvXOOipWmlXeANjG5u62utGjY3uAErXn+ws5qzyTuYKC2hCUimntzJitMJcaP9XRgfODS678NCGUAjztJo98mt5jRViYq7CwGQQ42CjjINyrrNlWp+s3WB16F8tu6M6uRudgv2QPJpROs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=gnAQ8c7l; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gnAQ8c7l" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1706728677; 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=lGf8V7YbO8S1JxykOgAqwJn9BdraNH1lFGF1LdAyQdg=; b=gnAQ8c7l1RRHHn8MqZPNnBJLi/XfhK2fLwmhywPLS7gUhKGbFQLJascpSt90vAOAwF4CM5 NAujZv9JUZntxswwGFpAHgwq1SjSnhVWCzF4T26fAJU1BhLdZwRz5izHHrpRNy1DmBUJXD p3EoNAtqFHclvgVlhkT8rM9db74LJsM= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-453-RcjBULaaPWGpQPubRupjSg-1; Wed, 31 Jan 2024 14:17:55 -0500 X-MC-Unique: RcjBULaaPWGpQPubRupjSg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5870329AC03F; Wed, 31 Jan 2024 19:17:54 +0000 (UTC) Received: from rhel-developer-toolbox-latest.rmtusor.csb (unknown [10.2.16.182]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2C24840CD14B; Wed, 31 Jan 2024 19:17:53 +0000 (UTC) From: Chris Leech To: Greg Kroah-Hartman , Nilesh Javali Cc: Christoph Hellwig , John Meneghini , Lee Duncan , Mike Christie , Hannes Reinecke , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, GR-QLogic-Storage-Upstream@marvell.com Subject: [PATCH 1/2] uio: introduce UIO_MEM_DMA_COHERENT type Date: Wed, 31 Jan 2024 11:17:31 -0800 Message-ID: <20240131191732.3247996-2-cleech@redhat.com> In-Reply-To: <20240131191732.3247996-1-cleech@redhat.com> References: <20240131191732.3247996-1-cleech@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Content-Type: text/plain; charset="utf-8" Add a UIO memtype specifically for sharing dma_alloc_coherent memory with userspace, backed by dma_mmap_coherent. This is mainly for the bnx2/bnx2x/bnx2i "cnic" interface, although there are a few other uio drivers which map dma_alloc_coherent memory and could be converted to use dma_mmap_coherent as well. Signed-off-by: Nilesh Javali Signed-off-by: Chris Leech Reviewed-by: Christoph Hellwig --- drivers/uio/uio.c | 40 ++++++++++++++++++++++++++++++++++++++ include/linux/uio_driver.h | 3 +++ 2 files changed, 43 insertions(+) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 2d572f6c8ec83..dde3f49855233 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -24,6 +24,7 @@ #include #include #include +#include =20 #define UIO_MAX_DEVICES (1U << MINORBITS) =20 @@ -759,6 +760,42 @@ static int uio_mmap_physical(struct vm_area_struct *vm= a) vma->vm_page_prot); } =20 +static int uio_mmap_dma_coherent(struct vm_area_struct *vma) +{ + struct uio_device *idev =3D vma->vm_private_data; + struct uio_mem *mem; + void *addr; + int ret =3D 0; + int mi; + + mi =3D uio_find_mem_index(vma); + if (mi < 0) + return -EINVAL; + + mem =3D idev->info->mem + mi; + + if (mem->dma_addr & ~PAGE_MASK) + return -ENODEV; + if (vma->vm_end - vma->vm_start > mem->size) + return -EINVAL; + + /* + * UIO uses offset to index into the maps for a device. + * We need to clear vm_pgoff for dma_mmap_coherent. + */ + vma->vm_pgoff =3D 0; + + addr =3D (void *)mem->addr; + ret =3D dma_mmap_coherent(mem->dma_device, + vma, + addr, + mem->dma_addr, + vma->vm_end - vma->vm_start); + vma->vm_pgoff =3D mi; + + return ret; +} + static int uio_mmap(struct file *filep, struct vm_area_struct *vma) { struct uio_listener *listener =3D filep->private_data; @@ -806,6 +843,9 @@ static int uio_mmap(struct file *filep, struct vm_area_= struct *vma) case UIO_MEM_VIRTUAL: ret =3D uio_mmap_logical(vma); break; + case UIO_MEM_DMA_COHERENT: + ret =3D uio_mmap_dma_coherent(vma); + break; default: ret =3D -EINVAL; } diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h index 47c5962b876b0..14d9dd2a07e85 100644 --- a/include/linux/uio_driver.h +++ b/include/linux/uio_driver.h @@ -37,10 +37,12 @@ struct uio_map; struct uio_mem { const char *name; phys_addr_t addr; + dma_addr_t dma_addr; unsigned long offs; resource_size_t size; int memtype; void __iomem *internal_addr; + struct device *dma_device; struct uio_map *map; }; =20 @@ -158,6 +160,7 @@ extern int __must_check #define UIO_MEM_LOGICAL 2 #define UIO_MEM_VIRTUAL 3 #define UIO_MEM_IOVA 4 +#define UIO_MEM_DMA_COHERENT 5 =20 /* defines for uio_port->porttype */ #define UIO_PORT_NONE 0 --=20 2.43.0