Re: [PATCH 3/5] PCI/p2p: remove the DMA_VIRT_OPS hacks

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s|PCI/p2p: remove|PCI/P2PDMA: Remove/
to match history.

On Wed, Nov 04, 2020 at 10:50:50AM +0100, Christoph Hellwig wrote:
> Now that all users of dma_virt_ops are gone we can remove the workaround
> for it in the PCIe peer to peer code.

s/PCIe/PCI/
We went to some trouble to make P2PDMA work on conventional PCI as
well as PCIe.

> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>

> ---
>  drivers/pci/p2pdma.c | 20 --------------------
>  1 file changed, 20 deletions(-)
> 
> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
> index de1c331dbed43f..b07018af53876c 100644
> --- a/drivers/pci/p2pdma.c
> +++ b/drivers/pci/p2pdma.c
> @@ -556,15 +556,6 @@ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
>  		return -1;
>  
>  	for (i = 0; i < num_clients; i++) {
> -#ifdef CONFIG_DMA_VIRT_OPS
> -		if (clients[i]->dma_ops == &dma_virt_ops) {
> -			if (verbose)
> -				dev_warn(clients[i],
> -					 "cannot be used for peer-to-peer DMA because the driver makes use of dma_virt_ops\n");
> -			return -1;
> -		}
> -#endif
> -
>  		pci_client = find_parent_pci_dev(clients[i]);
>  		if (!pci_client) {
>  			if (verbose)
> @@ -837,17 +828,6 @@ static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap,
>  	phys_addr_t paddr;
>  	int i;
>  
> -	/*
> -	 * p2pdma mappings are not compatible with devices that use
> -	 * dma_virt_ops. If the upper layers do the right thing
> -	 * this should never happen because it will be prevented
> -	 * by the check in pci_p2pdma_distance_many()
> -	 */
> -#ifdef CONFIG_DMA_VIRT_OPS
> -	if (WARN_ON_ONCE(dev->dma_ops == &dma_virt_ops))
> -		return 0;
> -#endif
> -
>  	for_each_sg(sg, s, nents, i) {
>  		paddr = sg_phys(s);
>  
> -- 
> 2.28.0
> 



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