259 lines
18 KiB
ReStructuredText
259 lines
18 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
.. _arch_page_table_helpers:
|
|
|
|
===============================
|
|
Architecture Page Table Helpers
|
|
===============================
|
|
|
|
Generic MM expects architectures (with MMU) to provide helpers to create, access
|
|
and modify page table entries at various level for different memory functions.
|
|
These page table helpers need to conform to a common semantics across platforms.
|
|
Following tables describe the expected semantics which can also be tested during
|
|
boot via CONFIG_DEBUG_VM_PGTABLE option. All future changes in here or the debug
|
|
test need to be in sync.
|
|
|
|
======================
|
|
PTE Page Table Helpers
|
|
======================
|
|
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_same | Tests whether both PTE entries are the same |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_bad | Tests a non-table mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_present | Tests a valid mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_young | Tests a young PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_dirty | Tests a dirty PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_write | Tests a writable PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_special | Tests a special PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_protnone | Tests a PROT_NONE PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_devmap | Tests a ZONE_DEVICE mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_soft_dirty | Tests a soft dirty PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_swp_soft_dirty | Tests a soft dirty swapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkyoung | Creates a young PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkold | Creates an old PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkdirty | Creates a dirty PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkclean | Creates a clean PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkwrite | Creates a writable PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkwrprotect | Creates a write protected PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkspecial | Creates a special PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkdevmap | Creates a ZONE_DEVICE mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mksoft_dirty | Creates a soft dirty PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_clear_soft_dirty | Clears a soft dirty PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_swp_mksoft_dirty | Creates a soft dirty swapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_swp_clear_soft_dirty | Clears a soft dirty swapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mknotpresent | Invalidates a mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| ptep_get_and_clear | Clears a PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| ptep_get_and_clear_full | Clears a PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| ptep_test_and_clear_young | Clears young from a PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| ptep_set_wrprotect | Converts into a write protected PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| ptep_set_access_flags | Converts into a more permissive PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
|
|
======================
|
|
PMD Page Table Helpers
|
|
======================
|
|
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_same | Tests whether both PMD entries are the same |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_bad | Tests a non-table mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_leaf | Tests a leaf mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_huge | Tests a HugeTLB mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_trans_huge | Tests a Transparent Huge Page (THP) at PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_present | Tests a valid mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_young | Tests a young PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_dirty | Tests a dirty PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_write | Tests a writable PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_special | Tests a special PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_protnone | Tests a PROT_NONE PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_devmap | Tests a ZONE_DEVICE mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_soft_dirty | Tests a soft dirty PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_swp_soft_dirty | Tests a soft dirty swapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkyoung | Creates a young PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkold | Creates an old PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkdirty | Creates a dirty PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkclean | Creates a clean PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkwrite | Creates a writable PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkwrprotect | Creates a write protected PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkspecial | Creates a special PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkdevmap | Creates a ZONE_DEVICE mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mksoft_dirty | Creates a soft dirty PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_clear_soft_dirty | Clears a soft dirty PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_swp_mksoft_dirty | Creates a soft dirty swapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_swp_clear_soft_dirty | Clears a soft dirty swapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_mkinvalid | Invalidates a mapped PMD [1] |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_set_huge | Creates a PMD huge mapping |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmd_clear_huge | Clears a PMD huge mapping |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmdp_get_and_clear | Clears a PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmdp_get_and_clear_full | Clears a PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmdp_test_and_clear_young | Clears young from a PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmdp_set_wrprotect | Converts into a write protected PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pmdp_set_access_flags | Converts into a more permissive PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
|
|
======================
|
|
PUD Page Table Helpers
|
|
======================
|
|
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_same | Tests whether both PUD entries are the same |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_bad | Tests a non-table mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_leaf | Tests a leaf mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_huge | Tests a HugeTLB mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_trans_huge | Tests a Transparent Huge Page (THP) at PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_present | Tests a valid mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_young | Tests a young PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_dirty | Tests a dirty PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_write | Tests a writable PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_devmap | Tests a ZONE_DEVICE mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkyoung | Creates a young PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkold | Creates an old PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkdirty | Creates a dirty PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkclean | Creates a clean PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkwrite | Creates a writable PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkwrprotect | Creates a write protected PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkdevmap | Creates a ZONE_DEVICE mapped PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_mkinvalid | Invalidates a mapped PUD [1] |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_set_huge | Creates a PUD huge mapping |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pud_clear_huge | Clears a PUD huge mapping |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pudp_get_and_clear | Clears a PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pudp_get_and_clear_full | Clears a PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pudp_test_and_clear_young | Clears young from a PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pudp_set_wrprotect | Converts into a write protected PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pudp_set_access_flags | Converts into a more permissive PUD |
|
|
+---------------------------+--------------------------------------------------+
|
|
|
|
==========================
|
|
HugeTLB Page Table Helpers
|
|
==========================
|
|
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_huge | Tests a HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| pte_mkhuge | Creates a HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_pte_dirty | Tests a dirty HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_pte_write | Tests a writable HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_pte_mkdirty | Creates a dirty HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_pte_mkwrite | Creates a writable HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_pte_mkwrprotect | Creates a write protected HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_ptep_get_and_clear | Clears a HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_ptep_set_wrprotect | Converts into a write protected HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
| huge_ptep_set_access_flags | Converts into a more permissive HugeTLB |
|
|
+---------------------------+--------------------------------------------------+
|
|
|
|
========================
|
|
SWAP Page Table Helpers
|
|
========================
|
|
|
|
+---------------------------+--------------------------------------------------+
|
|
| __pte_to_swp_entry | Creates a swapped entry (arch) from a mapped PTE |
|
|
+---------------------------+--------------------------------------------------+
|
|
| __swp_to_pte_entry | Creates a mapped PTE from a swapped entry (arch) |
|
|
+---------------------------+--------------------------------------------------+
|
|
| __pmd_to_swp_entry | Creates a swapped entry (arch) from a mapped PMD |
|
|
+---------------------------+--------------------------------------------------+
|
|
| __swp_to_pmd_entry | Creates a mapped PMD from a swapped entry (arch) |
|
|
+---------------------------+--------------------------------------------------+
|
|
| is_migration_entry | Tests a migration (read or write) swapped entry |
|
|
+---------------------------+--------------------------------------------------+
|
|
| is_write_migration_entry | Tests a write migration swapped entry |
|
|
+---------------------------+--------------------------------------------------+
|
|
| make_migration_entry_read | Converts into read migration swapped entry |
|
|
+---------------------------+--------------------------------------------------+
|
|
| make_migration_entry | Creates a migration swapped entry (read or write)|
|
|
+---------------------------+--------------------------------------------------+
|
|
|
|
[1] https://lore.kernel.org/linux-mm/20181017020930.GN30832@redhat.com/
|