From: Sherry Sun <sherry.sun@nxp.com>
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 [thread overview]
Message-ID: <20200925072630.8157-6-sherry.sun@nxp.com> (raw)
In-Reply-To: <20200925072630.8157-1-sherry.sun@nxp.com>
Mapping kernel space memory to user space as noncached for noncoherent
platform, since user space need check 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 | 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
next prev parent reply other threads:[~2020-09-25 7:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 7:26 [PATCH 0/5] Add noncoherent platform support for vop driver Sherry Sun
2020-09-25 7:26 ` [PATCH 1/5] misc: vop: change the way of allocating vring for noncoherent platform Sherry Sun
2020-09-25 12:16 ` Greg KH
2020-09-27 7:06 ` Sherry Sun
2020-09-26 7:50 ` Christoph Hellwig
2020-09-27 7:58 ` Sherry Sun
2020-09-28 6:09 ` Christoph Hellwig
2020-09-28 10:10 ` Sherry Sun
2020-09-25 7:26 ` [PATCH 2/5] misc: vop: change the way of allocating used ring Sherry Sun
2020-09-25 7:26 ` [PATCH 3/5] misc: vop: simply return the saved dma address instead of virt_to_phys Sherry Sun
2020-09-25 12:17 ` Greg KH
2020-09-27 7:23 ` Sherry Sun
2020-09-25 7:26 ` [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS_PLATFORM for nocoherent platform Sherry Sun
2020-09-25 12:16 ` Greg KH
2020-09-27 7:20 ` Sherry Sun
2020-09-26 7:51 ` Christoph Hellwig
2020-09-27 8:05 ` Sherry Sun
2020-09-28 6:09 ` Christoph Hellwig
2020-09-28 9:57 ` Sherry Sun
2020-09-25 7:26 ` Sherry Sun [this message]
2020-09-25 11:25 ` [PATCH 0/5] Add noncoherent platform support for vop driver Arnd Bergmann
2020-09-27 5:07 ` Sherry Sun
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