linux-kernel - [PATCH V2 4/5] vdpa: set dma mask for vDPA device

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Message-Id: <20230119061525.75068-5-jasowang@redhat.com>
Date:   Thu, 19 Jan 2023 14:15:24 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     elic@...dia.com, gdawar@....com, tanuj.kamde@....com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH V2 4/5] vdpa: set dma mask for vDPA device

Setting DMA mask for vDPA device in case that there are virtqueue that
is not backed by DMA so the vDPA device could be advertised as the DMA
device that is used by DMA API for software emulated virtqueues.

Reviewed-by: Eli Cohen <elic@...dia.com>
Tested-by: Eli Cohen <elic@...dia.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vdpa/vdpa.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 8ef7aa1365cc..6821b2850bbb 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -39,6 +39,11 @@ static int vdpa_dev_probe(struct device *d)
 	u32 max_num, min_num = 1;
 	int ret = 0;
 
+	d->dma_mask = &d->coherent_dma_mask;
+	ret = dma_set_mask_and_coherent(d, DMA_BIT_MASK(64));
+	if (ret)
+		return ret;
+
 	max_num = ops->get_vq_num_max(vdev);
 	if (ops->get_vq_num_min)
 		min_num = ops->get_vq_num_min(vdev);
-- 
2.25.1