On 06/05/2019 02:11 PM, Yoshihiro Shimoda wrote: > This patch adds a new capable IOMMU_CAP_MERGING to check whether > the IOVA would be contiguous strictly if a device requires and > the IOMMU driver has the capable. s/has/is/? Or capable what? > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> > --- > drivers/iommu/dma-iommu.c | 26 ++++++++++++++++++++++++-- > include/linux/iommu.h | 1 + > 2 files changed, 25 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index 034caae..ecf1a04 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c [...] > @@ -867,6 +872,13 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, > sg_dma_len(s) = s_length; > s->offset -= s_iova_off; > s_length = iova_align(iovad, s_length + s_iova_off); > + /* > + * Check whether the IOVA would be contiguous strictly if > + * a device requires and the IOMMU driver has the capable. Same question here... > + */ > + if (iova_contiguous && i > 0 && > + (s_iova_off || s->length != s_length)) > + return 0; > s->length = s_length; > > /* > @@ -902,8 +914,18 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, > if (iommu_map_sg(domain, iova, sg, nents, prot) < iova_len) > goto out_free_iova; > > - return __finalise_sg(dev, sg, nents, iova); > + ret = __finalise_sg(dev, sg, nents, iova); > + /* > + * Check whether the sg entry is single if a device requires and > + * the IOMMU driver has the capable. You meant capability perhaps? [...] MBR, Sergei
