linux-kernel - [PATCH 3/4] vdpa: get_iova_range() is mandatory for device specific DMA translation

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Date:   Wed, 17 Jun 2020 11:29:46 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     rob.miller@...adcom.com, lingshan.zhu@...el.com,
        eperezma@...hat.com, lulu@...hat.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com,
        zhangweining@...jie.com.cn, eli@...lanox.com
Subject: [PATCH 3/4] vdpa: get_iova_range() is mandatory for device specific DMA translation

In order to let userspace work correctly, get_iova_range() is a must
for the device that has its own DMA translation logic.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vdpa/vdpa.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index de211ef3738c..ab7af978ef70 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -82,6 +82,10 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
 	if (!!config->dma_map != !!config->dma_unmap)
 		goto err;
 
+	if ((config->dma_map || config->set_map) &&
+	    !config->get_iova_range)
+		goto err;
+
 	err = -ENOMEM;
 	vdev = kzalloc(size, GFP_KERNEL);
 	if (!vdev)
-- 
2.20.1