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Message-Id: <20220615161233.17527-6-logang@deltatee.com>
Date: Wed, 15 Jun 2022 10:12:17 -0600
From: Logan Gunthorpe <logang@...tatee.com>
To: linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
linux-mm@...ck.org, iommu@...ts.linux-foundation.org
Cc: Stephen Bates <sbates@...thlin.com>,
Christoph Hellwig <hch@....de>,
Dan Williams <dan.j.williams@...el.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Christian König <christian.koenig@....com>,
John Hubbard <jhubbard@...dia.com>,
Don Dutile <ddutile@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Minturn Dave B <dave.b.minturn@...el.com>,
Jason Ekstrand <jason@...kstrand.net>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Xiong Jianxin <jianxin.xiong@...el.com>,
Bjorn Helgaas <helgaas@...nel.org>,
Ira Weiny <ira.weiny@...el.com>,
Robin Murphy <robin.murphy@....com>,
Martin Oliveira <martin.oliveira@...eticom.com>,
Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
Ralph Campbell <rcampbell@...dia.com>,
Logan Gunthorpe <logang@...tatee.com>,
Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH v7 05/21] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers
Add EREMOTEIO error return to dma_map_sgtable() which will be used
by .map_sg() implementations that detect P2PDMA pages that the
underlying DMA device cannot access.
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---
kernel/dma/mapping.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index db7244291b74..9f65d1041638 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -197,7 +197,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
if (ents > 0)
debug_dma_map_sg(dev, sg, nents, ents, dir, attrs);
else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
- ents != -EIO))
+ ents != -EIO && ents != -EREMOTEIO))
return -EIO;
return ents;
@@ -255,6 +255,8 @@ EXPORT_SYMBOL(dma_map_sg_attrs);
* complete the mapping. Should succeed if retried later.
* -EIO Legacy error code with an unknown meaning. eg. this is
* returned if a lower level call returned DMA_MAPPING_ERROR.
+ * -EREMOTEIO The DMA device cannot access P2PDMA memory specified in
+ * the sg_table. This will not succeed if retried.
*/
int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
enum dma_data_direction dir, unsigned long attrs)
--
2.30.2
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