1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_MM_TYPES_TASK_H |
3 | #define _LINUX_MM_TYPES_TASK_H |
4 | |
5 | /* |
6 | * Here are the definitions of the MM data types that are embedded in 'struct task_struct'. |
7 | * |
8 | * (These are defined separately to decouple sched.h from mm_types.h as much as possible.) |
9 | */ |
10 | |
11 | #include <linux/types.h> |
12 | #include <linux/threads.h> |
13 | #include <linux/atomic.h> |
14 | #include <linux/cpumask.h> |
15 | |
16 | #include <asm/page.h> |
17 | |
18 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
19 | #include <asm/tlbbatch.h> |
20 | #endif |
21 | |
22 | #define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) |
23 | #define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \ |
24 | IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK)) |
25 | #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8) |
26 | |
27 | /* |
28 | * When updating this, please also update struct resident_page_types[] in |
29 | * kernel/fork.c |
30 | */ |
31 | enum { |
32 | MM_FILEPAGES, /* Resident file mapping pages */ |
33 | MM_ANONPAGES, /* Resident anonymous pages */ |
34 | MM_SWAPENTS, /* Anonymous swap entries */ |
35 | MM_SHMEMPAGES, /* Resident shared memory pages */ |
36 | NR_MM_COUNTERS |
37 | }; |
38 | |
39 | struct page_frag { |
40 | struct page *page; |
41 | #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) |
42 | __u32 offset; |
43 | __u32 size; |
44 | #else |
45 | __u16 offset; |
46 | __u16 size; |
47 | #endif |
48 | }; |
49 | |
50 | /* Track pages that require TLB flushes */ |
51 | struct tlbflush_unmap_batch { |
52 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
53 | /* |
54 | * The arch code makes the following promise: generic code can modify a |
55 | * PTE, then call arch_tlbbatch_add_pending() (which internally provides |
56 | * all needed barriers), then call arch_tlbbatch_flush(), and the entries |
57 | * will be flushed on all CPUs by the time that arch_tlbbatch_flush() |
58 | * returns. |
59 | */ |
60 | struct arch_tlbflush_unmap_batch arch; |
61 | |
62 | /* True if a flush is needed. */ |
63 | bool flush_required; |
64 | |
65 | /* |
66 | * If true then the PTE was dirty when unmapped. The entry must be |
67 | * flushed before IO is initiated or a stale TLB entry potentially |
68 | * allows an update without redirtying the page. |
69 | */ |
70 | bool writable; |
71 | #endif |
72 | }; |
73 | |
74 | #endif /* _LINUX_MM_TYPES_TASK_H */ |
75 | |