On 2022-05-27 06:55, Jason Gunthorpe wrote:
> 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.
Can you send a link? I'm not sure what you are referring to.
Thanks,
Logan
