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This is currently the case for MEMORY_DEVICE_PRIVATE and MEMORY_DEVICE_COHERENT pages but not MEMORY_DEVICE_PCI_P2PDMA pages so fix that up. Signed-off-by: Alistair Popple Reviewed-by: Dan Williams --- drivers/pci/p2pdma.c | 6 ++++++ mm/memremap.c | 17 +++++++++++++---- mm/mm_init.c | 22 ++++++++++++++++++---- 3 files changed, 37 insertions(+), 8 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4f47a13..210b9f4 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -129,6 +129,12 @@ static int p2pmem_alloc_mmap(struct file *filp, struct kobject *kobj, } /* + * Initialise the refcount for the freshly allocated page. As we have + * just allocated the page no one else should be using it. + */ + set_page_count(virt_to_page(kaddr), 1); + + /* * vm_insert_page() can sleep, so a reference is taken to mapping * such that rcu_read_unlock() can be done before inserting the * pages diff --git a/mm/memremap.c b/mm/memremap.c index 40d4547..07bbe0e 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -488,15 +488,24 @@ void free_zone_device_folio(struct folio *folio) folio->mapping = NULL; folio->page.pgmap->ops->page_free(folio_page(folio, 0)); - if (folio->page.pgmap->type != MEMORY_DEVICE_PRIVATE && - folio->page.pgmap->type != MEMORY_DEVICE_COHERENT) + switch (folio->page.pgmap->type) { + case MEMORY_DEVICE_PRIVATE: + case MEMORY_DEVICE_COHERENT: + put_dev_pagemap(folio->page.pgmap); + break; + + case MEMORY_DEVICE_FS_DAX: + case MEMORY_DEVICE_GENERIC: /* * Reset the refcount to 1 to prepare for handing out the page * again. */ folio_set_count(folio, 1); - else - put_dev_pagemap(folio->page.pgmap); + break; + + case MEMORY_DEVICE_PCI_P2PDMA: + break; + } } void zone_device_page_init(struct page *page) diff --git a/mm/mm_init.c b/mm/mm_init.c index 4ba5607..0489820 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1015,12 +1015,26 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn, } /* - * ZONE_DEVICE pages are released directly to the driver page allocator - * which will set the page count to 1 when allocating the page. + * ZONE_DEVICE pages other than MEMORY_TYPE_GENERIC and + * MEMORY_TYPE_FS_DAX pages are released directly to the driver page + * allocator which will set the page count to 1 when allocating the + * page. + * + * MEMORY_TYPE_GENERIC and MEMORY_TYPE_FS_DAX pages automatically have + * their refcount reset to one whenever they are freed (ie. after + * their refcount drops to 0). */ - if (pgmap->type == MEMORY_DEVICE_PRIVATE || - pgmap->type == MEMORY_DEVICE_COHERENT) + switch (pgmap->type) { + case MEMORY_DEVICE_PRIVATE: + case MEMORY_DEVICE_COHERENT: + case MEMORY_DEVICE_PCI_P2PDMA: set_page_count(page, 0); + break; + + case MEMORY_DEVICE_FS_DAX: + case MEMORY_DEVICE_GENERIC: + break; + } } /*