On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
> +int dma_pci_p2pdma_supported(struct device *dev)
> +{
> + const struct dma_map_ops *ops = get_dma_ops(dev);
> +
> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
> +}
> +EXPORT_SYMBOL(dma_pci_p2pdma_supported);
On Mon, Mar 15, 2021 at 10:33:13AM -0600, Logan Gunthorpe wrote:
> >> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
> >
> > Is this logic correct? I would have expected.
> >
> > return (ops && ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED);
>
>
> If ops is NULL then the operations
On 2021-03-12 7:36 p.m., Ira Weiny wrote:
> On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
>
>> +int dma_pci_p2pdma_supported(struct device *dev)
>^^^
> bool?
Sure.
>
>> +{
>> +const struct dma_map_ops *ops = get_dma_ops(dev);
>> +
>> +return !ops ||
On Thu, Mar 11, 2021 at 04:31:37PM -0700, Logan Gunthorpe wrote:
> +int dma_pci_p2pdma_supported(struct device *dev)
^^^
bool?
> +{
> + const struct dma_map_ops *ops = get_dma_ops(dev);
> +
> + return !ops || ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
Is this logic correct? I would
Add a flags member to the dma_map_ops structure with one flag to
indicate support for PCI P2PDMA.
Also, add a helper to check if a device supports PCI P2PDMA.
Signed-off-by: Logan Gunthorpe
---
include/linux/dma-map-ops.h | 3 +++
include/linux/dma-mapping.h | 5 +
kernel/dma/mapping.c
