From b05a79d4377f6dcc30683008ffd1c531ea965393 Mon Sep 17 00:00:00 2001 From: Alistair Popple Date: Fri, 15 Jul 2022 10:05:13 -0500 Subject: mm/gup: migrate device coherent pages when pinning instead of failing Currently any attempts to pin a device coherent page will fail. This is because device coherent pages need to be managed by a device driver, and pinning them would prevent a driver from migrating them off the device. However this is no reason to fail pinning of these pages. These are coherent and accessible from the CPU so can be migrated just like pinning ZONE_MOVABLE pages. So instead of failing all attempts to pin them first try migrating them out of ZONE_DEVICE. [hch@lst.de: rebased to the split device memory checks, moved migrate_device_page to migrate_device.c] Link: https://lkml.kernel.org/r/20220715150521.18165-7-alex.sierra@amd.com Signed-off-by: Alistair Popple Signed-off-by: Christoph Hellwig Acked-by: Felix Kuehling Cc: David Hildenbrand Cc: Jason Gunthorpe Cc: Jerome Glisse Cc: Matthew Wilcox Cc: Ralph Campbell Signed-off-by: Andrew Morton --- mm/internal.h | 1 + 1 file changed, 1 insertion(+) (limited to 'mm/internal.h') diff --git a/mm/internal.h b/mm/internal.h index c0f8fbe0445b..899dab512c5a 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -853,6 +853,7 @@ int numa_migrate_prep(struct page *page, struct vm_area_struct *vma, unsigned long addr, int page_nid, int *flags); void free_zone_device_page(struct page *page); +int migrate_device_coherent_page(struct page *page); /* * mm/gup.c -- cgit v1.2.3