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Fri, 25 Sep 2020 07:27:54 +0000 From: Sherry Sun To: sudeep.dutt@intel.com, ashutosh.dixit@intel.com, arnd@arndb.de, gregkh@linuxfoundation.org, wang.yi59@zte.com.cn, huang.zijiang@zte.com.cn, rikard.falkeborn@gmail.com, lee.jones@linaro.org, mst@redhat.com Cc: linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH 5/5] misc: vop: mapping kernel memory to user space as noncached Date: Fri, 25 Sep 2020 15:26:30 +0800 Message-Id: <20200925072630.8157-6-sherry.sun@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200925072630.8157-1-sherry.sun@nxp.com> References: <20200925072630.8157-1-sherry.sun@nxp.com> Content-Type: text/plain X-ClientProxiedBy: AM0PR10CA0033.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:20b:150::13) To VI1PR04MB4960.eurprd04.prod.outlook.com (2603:10a6:803:57::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from nxp.ap.freescale.net (119.31.174.71) by AM0PR10CA0033.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:20b:150::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3412.23 via Frontend Transport; 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Signed-off-by: Joakim Zhang Signed-off-by: Sherry Sun --- drivers/misc/mic/vop/vop_vringh.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c index aa2dd240c11e..9850515e8d21 100644 --- a/drivers/misc/mic/vop/vop_vringh.c +++ b/drivers/misc/mic/vop/vop_vringh.c @@ -1139,7 +1139,9 @@ static int vop_mmap(struct file *f, struct vm_area_struct *vma) } err = remap_pfn_range(vma, vma->vm_start + offset, pa >> PAGE_SHIFT, size, - vma->vm_page_prot); + dev_is_dma_coherent(vop_dev(vdev)) ? vma->vm_page_prot : + pgprot_noncached(vma->vm_page_prot)); + if (err) goto ret; size_rem -= size; -- 2.17.1