linux-kernel - [RFC 1/6] s390/ism: Set DMA coherent mask

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Message-Id: <20221019144435.369902-2-schnelle@linux.ibm.com>
Date:   Wed, 19 Oct 2022 16:44:30 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, iommu@...ts.linux.dev,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Gerd Bayer <gbayer@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Julian Ruess <julianr@...ux.ibm.com>
Subject: [RFC 1/6] s390/ism: Set DMA coherent mask

A future change will convert the DMA API implementation from the
architecture specific arch/s390/pci/pci_dma.c to using the common code
drivers/iommu/dma-iommu.c which the utilizes the same IOMMU hardware
through the s390-iommu driver. Unlike the s390 specific DMA API this
requires devices to correctly call dma_set_coherent_mask() to be allowed
to use IOVAs >2^32 in dma_alloc_coherent(). This was however not done
for ISM devices which require such addresses since currently the DMA
aperture for PCI devices starts a 2^32 and all calls to
dma_alloc_coherent() would thus fail.

Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 drivers/s390/net/ism_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index d34bb6ec1490..5890c32a9e1f 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -560,6 +560,10 @@ static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (ret)
 		goto err_resource;
 
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret)
+		goto err_resource;
+
 	dma_set_seg_boundary(&pdev->dev, SZ_1M - 1);
 	dma_set_max_seg_size(&pdev->dev, SZ_1M);
 	pci_set_master(pdev);
-- 
2.34.1