On Thu, Apr 07, 2022 at 09:47:16AM -0600, Logan Gunthorpe wrote:
> +static void pci_p2pdma_unmap_mappings(void *data)
> +{
> + struct pci_dev *pdev = data;
> + struct pci_p2pdma *p2pdma = rcu_dereference_protected(pdev->p2pdma, 1);
> +
> + /* Ensure no new pages can be allocated in mappings */
> + p2pdma->active = false;
> + synchronize_rcu();
> +
> + unmap_mapping_range(p2pdma->inode->i_mapping, 0, 0, 1);
> +
> + /*
> + * On some architectures, TLB flushes are done with call_rcu()
> + * so to ensure GUP fast is done with the pages, call synchronize_rcu()
> + * before freeing them.
> + */
> + synchronize_rcu();
> + pci_p2pdma_free_mappings(p2pdma->inode->i_mapping);
With the series from Felix getting close this should get updated to
not set pte_devmap and use proper natural refcounting without any of
this stuff.
Jason
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