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From: Sherry Sun <sherry.sun@nxp.com>
To: hch@infradead.org, sudeep.dutt@intel.com,
	ashutosh.dixit@intel.com, arnd@arndb.de,
	gregkh@linuxfoundation.org, kishon@ti.com,
	lorenzo.pieralisi@arm.com
Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-imx@nxp.com
Subject: [PATCH V3 4/4] misc: vop: mapping kernel memory to user space as noncached
Date: Thu, 22 Oct 2020 13:06:38 +0800	[thread overview]
Message-ID: <20201022050638.29641-5-sherry.sun@nxp.com> (raw)
In-Reply-To: <20201022050638.29641-1-sherry.sun@nxp.com>

Mapping kernel space memory to user space as noncached, since user space
need check the updates of avail_idx and device page flags timely.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
---
 drivers/misc/mic/vop/vop_vringh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index b5612183dcb8..b75c2b713a3b 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -1058,7 +1058,7 @@ 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);
+				      pgprot_noncached(vma->vm_page_prot));
 		if (err)
 			goto ret;
 		size_rem -= size;
-- 
2.17.1


  parent reply	other threads:[~2020-10-22  5:08 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-22  5:06 [PATCH V3 0/4] Change vring space from nomal memory to dma coherent memory Sherry Sun
2020-10-22  5:06 ` [PATCH V3 1/4] misc: vop: change the way of allocating vring and device page Sherry Sun
2020-10-22  7:58   ` kernel test robot
2020-10-23  9:25   ` Christoph Hellwig
2020-10-26  2:54     ` Sherry Sun
2020-10-22  5:06 ` [PATCH V3 2/4] misc: vop: do not allocate and reassign the used ring Sherry Sun
2020-10-22  8:53   ` kernel test robot
2020-10-23  9:26   ` Christoph Hellwig
2020-10-26  3:04     ` Sherry Sun
2020-10-27  6:28       ` gregkh
2020-10-22  5:06 ` [PATCH V3 3/4] misc: vop: simply return the saved dma address instead of virt_to_phys Sherry Sun
2020-10-22  5:06 ` Sherry Sun [this message]
2020-10-23  9:28   ` [PATCH V3 4/4] misc: vop: mapping kernel memory to user space as noncached Christoph Hellwig

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