From patchwork Tue Jan 9 12:14:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nilesh Javali X-Patchwork-Id: 13514875 Received: from mx0b-0016f401.pphosted.com (mx0a-0016f401.pphosted.com [67.231.148.174]) (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 7D67D381DA for ; Tue, 9 Jan 2024 12:15:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=marvell.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=marvell.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=marvell.com header.i=@marvell.com header.b="gZKMDGVx" Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 409BvUYJ018215; Tue, 9 Jan 2024 04:15:21 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= pfpt0220; bh=qaOwoCxoV4gEUMRbXAzyGEEYtiSsMammCVbWpD7wIKU=; b=gZK MDGVxK9gA2CxO6sMLXaeQd2yQ6I1wlnT0Ask9029RNuHmnIU6lJ7ri7Y29eEzh3c hCgFKO38Irt3wc4iB16L5WZ/tTn4FYpYNlZimbV75oZOG/ZodkKmSpIBxsvSUGKw pUUkBPf9OFCfXZ+Dl2b1cRjcCq7dEcOi8igyLSeUR5VAxDEkmsuKdT2RBuOgKhBG fGORmuqDu9L6UKywdEQz3lMJbhbnYeCSaVJ3cYM26xvtequStEc0avCoQkVjQEVo hg7wkFMRTN2bClE1JM31TgNlvQvmkvK7u5Y8AywZFWmK5GntPbRMUjh8+owY+Tuz owKZlS/ePuT1ZwDK4Eg== Received: from dc5-exch02.marvell.com ([199.233.59.182]) by mx0a-0016f401.pphosted.com (PPS) with ESMTPS id 3vh5qt02td-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Tue, 09 Jan 2024 04:15:21 -0800 (PST) Received: from DC5-EXCH02.marvell.com (10.69.176.39) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Tue, 9 Jan 2024 04:15:19 -0800 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.48 via Frontend Transport; Tue, 9 Jan 2024 04:15:19 -0800 Received: from stgdev-a5u16.punelab.marvell.com (stgdev-a5u16.punelab.marvell.com [10.31.33.187]) by maili.marvell.com (Postfix) with ESMTP id CB15F3F70B4; Tue, 9 Jan 2024 04:15:17 -0800 (PST) From: Nilesh Javali To: , , CC: , , Subject: [PATCH v3 1/3] uio: introduce UIO_MEM_DMA_COHERENT type Date: Tue, 9 Jan 2024 17:44:56 +0530 Message-ID: <20240109121458.26475-2-njavali@marvell.com> X-Mailer: git-send-email 2.23.1 In-Reply-To: <20240109121458.26475-1-njavali@marvell.com> References: <20240109121458.26475-1-njavali@marvell.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: c5s46ZUEAaEXriuU8INH1nc94IW1MHRM X-Proofpoint-GUID: c5s46ZUEAaEXriuU8INH1nc94IW1MHRM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_02,2023-12-07_01,2023-05-22_02 From: Chris Leech Add a UIO memtype specifically for sharing dma_alloc_coherent memory with userspace, backed by dma_mmap_coherent. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202401042222.J9GOUiYL-lkp@intel.com/ Signed-off-by: Nilesh Javali Signed-off-by: Chris Leech --- v3: - fix warnings reported by kernel test robot v2: - expose only the dma_addr within uio_mem - Cleanup newly added unions comprising virtual_addr and struct device drivers/uio/uio.c | 40 ++++++++++++++++++++++++++++++++++++++ include/linux/uio_driver.h | 2 ++ 2 files changed, 42 insertions(+) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 62082d64ece0..01d83728b513 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -24,6 +24,7 @@ #include #include #include +#include #define UIO_MAX_DEVICES (1U << MINORBITS) @@ -759,6 +760,42 @@ static int uio_mmap_physical(struct vm_area_struct *vma) vma->vm_page_prot); } +static int uio_mmap_dma_coherent(struct vm_area_struct *vma) +{ + struct uio_device *idev = vma->vm_private_data; + struct uio_mem *mem; + void *addr; + int ret = 0; + int mi; + + mi = uio_find_mem_index(vma); + if (mi < 0) + return -EINVAL; + + mem = 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 = 0; + + addr = (void *)mem->addr; + ret = dma_mmap_coherent(&idev->dev, + vma, + addr, + mem->dma_addr, + vma->vm_end - vma->vm_start); + vma->vm_pgoff = mi; + + return ret; +} + static int uio_mmap(struct file *filep, struct vm_area_struct *vma) { struct uio_listener *listener = filep->private_data; @@ -806,6 +843,9 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma) case UIO_MEM_VIRTUAL: ret = uio_mmap_logical(vma); break; + case UIO_MEM_DMA_COHERENT: + ret = uio_mmap_dma_coherent(vma); + break; default: ret = -EINVAL; } diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h index 47c5962b876b..7efa81497183 100644 --- a/include/linux/uio_driver.h +++ b/include/linux/uio_driver.h @@ -37,6 +37,7 @@ 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; @@ -158,6 +159,7 @@ 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 /* defines for uio_port->porttype */ #define UIO_PORT_NONE 0