On 2021-03-16 1:58 a.m., Christoph Hellwig wrote:
> On Fri, Mar 12, 2021 at 11:27:46AM -0700, Logan Gunthorpe wrote:
>> So then we reject the patches that make that change. Seems like an odd
>> argument to say that we can't do something that won't cause problems
>> because someone might use it a
On Thu, Mar 11, 2021 at 04:31:36PM -0700, Logan Gunthorpe wrote:
> for_each_sg(sgl, sg, nents, i) {
> + if (is_pci_p2pdma_page(sg_page(sg))) {
> + if (sg_page(sg)->pgmap != pgmap) {
> + pgmap = sg_page(sg)->pgmap;
> +
On Fri, Mar 12, 2021 at 11:27:46AM -0700, Logan Gunthorpe wrote:
> So then we reject the patches that make that change. Seems like an odd
> argument to say that we can't do something that won't cause problems
> because someone might use it as an example and do something that will
> cause problems.
On Fri, Mar 12, 2021 at 06:11:17PM +, Robin Murphy wrote:
> Sure, that's how things stand immediately after this patch. But then
> someone comes along with the perfectly reasonable argument for returning
> more expressive error information for regular mapping failures as well
> (because some
On 2021-03-12 11:11 a.m., Robin Murphy wrote:
> On 2021-03-12 16:24, Logan Gunthorpe wrote:
>>
>>
>> On 2021-03-12 8:52 a.m., Robin Murphy wrote:
+
sg->dma_address = dma_direct_map_page(dev, sg_page(sg),
sg->offset, sg->length, dir, attrs);
On 2021-03-12 16:24, Logan Gunthorpe wrote:
On 2021-03-12 8:52 a.m., Robin Murphy wrote:
+
sg->dma_address = dma_direct_map_page(dev, sg_page(sg),
sg->offset, sg->length, dir, attrs);
if (sg->dma_address == DMA_MAPPING_ERROR)
@@ -411,7 +440,7 @@ int dma
On 2021-03-12 8:52 a.m., Robin Murphy wrote:
>> +
>> sg->dma_address = dma_direct_map_page(dev, sg_page(sg),
>> sg->offset, sg->length, dir, attrs);
>> if (sg->dma_address == DMA_MAPPING_ERROR)
>> @@ -411,7 +440,7 @@ int dma_direct_map_sg(struct device *dev,
On 2021-03-11 23:31, Logan Gunthorpe wrote:
Add PCI P2PDMA support for dma_direct_map_sg() so that it can map
PCI P2PDMA pages directly without a hack in the callers. This allows
for heterogeneous SGLs that contain both P2PDMA and regular pages.
SGL segments that contain PCI bus addresses are ma
Add PCI P2PDMA support for dma_direct_map_sg() so that it can map
PCI P2PDMA pages directly without a hack in the callers. This allows
for heterogeneous SGLs that contain both P2PDMA and regular pages.
SGL segments that contain PCI bus addresses are marked with
sg_mark_pci_p2pdma() and are ignored
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