include/linux/memremap.h

1 /* SPDX-License-Identifier: GPL-2.0 */
8 #include <linux/percpu-refcount.h>
14  * struct vmem_altmap - pre-allocated storage for vmemmap_populate
56  * wakeup event whenever a page is unpinned and becomes idle. This
57  * wakeup is used to coordinate physical address space management (ex:
66  * Device memory residing in a PCI BAR intended for use with Peer-to-Peer
81 	 * reset to one by the core code after the method is called to prepare
87 	 * Used for private (un-addressable) device memory only.  Must migrate
98 	 * When this is not implemented, or it returns -EOPNOTSUPP, the caller
108  * struct dev_pagemap - metadata for ZONE_DEVICE mappings
109  * @altmap: pre-allocated/reserved memory for vmemmap allocations
119  * @ops: method table
145 	return pgmap->ops && pgmap->ops->memory_failure;  in pgmap_has_memory_failure()
150 	if (pgmap->flags & PGMAP_ALTMAP_VALID)  in pgmap_altmap()
151 		return &pgmap->altmap;  in pgmap_altmap()
157 	return 1 << pgmap->vmemmap_shift;  in pgmap_vmemmap_nr()
164 		page->pgmap->type == MEMORY_DEVICE_PRIVATE;  in is_device_private_page()
169 	return is_device_private_page(&folio->page);  in folio_is_device_private()
176 		page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA;  in is_pci_p2pdma_page()
182 		page->pgmap->type == MEMORY_DEVICE_COHERENT;  in is_device_coherent_page()
187 	return is_device_coherent_page(&folio->page);  in folio_is_device_coherent()
211 	return ERR_PTR(-ENXIO);  in devm_memremap_pages()
240 		percpu_ref_put(&pgmap->ref);  in put_dev_pagemap()