Hi Christoph,
> From: Christoph Hellwig, Sent: Friday, June 7, 2019 2:50 PM
>
> On Fri, Jun 07, 2019 at 05:41:56AM +, Yoshihiro Shimoda wrote:
> > > bool blk_can_use_iommu_merging(struct request_queue *q, struct device
> > > *dev)
> > > {
> > > if (!IOMMU_CAN_MERGE_SEGMENTS(dev))
> > >
On Fri, Jun 07, 2019 at 05:41:56AM +, Yoshihiro Shimoda wrote:
> > bool blk_can_use_iommu_merging(struct request_queue *q, struct device *dev)
> > {
> > if (!IOMMU_CAN_MERGE_SEGMENTS(dev))
> > return false;
>
> As Robin mentioned, all IOMMUs can merge segments so that we don't
Hi Christoph,
> From: Christoph Hellwig, Sent: Thursday, June 6, 2019 4:01 PM
>
> On Thu, Jun 06, 2019 at 06:28:47AM +, Yoshihiro Shimoda wrote:
> > > The problem is that we need a way to communicate to the block layer
> > > that more than a single segment is ok IFF the DMA API instance suppo
On Thu, Jun 06, 2019 at 06:28:47AM +, Yoshihiro Shimoda wrote:
> > The problem is that we need a way to communicate to the block layer
> > that more than a single segment is ok IFF the DMA API instance supports
> > merging. And of course the answer will depend on futher parameters
> > like the
Hi Christoph,
Thank you for your comments!
> From: Christoph Hellwig, Sent: Wednesday, June 5, 2019 9:38 PM
>
> On Wed, Jun 05, 2019 at 01:21:59PM +0100, Robin Murphy wrote:
> > And if the problem is really that you're not getting merging because of
> > exposing the wrong parameters to the DMA A
Hi Robin,
Thank you for your comments!
> From: Robin Murphy, Sent: Wednesday, June 5, 2019 9:22 PM
> > @@ -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_fr
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
> ---
> dri
On Wed, Jun 05, 2019 at 01:21:59PM +0100, Robin Murphy wrote:
> And if the problem is really that you're not getting merging because of
> exposing the wrong parameters to the DMA API and/or the block layer, or
> that you just can't quite express your requirement to the block layer in
> the first
On 05/06/2019 12:11, 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.
Signed-off-by: Yoshihiro Shimoda
---
drivers/iommu/dma-iommu.c | 26 +
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.
Signed-off-by: Yoshihiro Shimoda
---
drivers/iommu/dma-iommu.c | 26 --
include/linux/iommu.h | 1 +
2 fi
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