xref: /openbmc/linux/arch/s390/include/asm/mmu.h (revision 840565b1)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __MMU_H
3 #define __MMU_H
4 
5 #include <linux/cpumask.h>
6 #include <linux/errno.h>
7 #include <asm/asm-extable.h>
8 
9 typedef struct {
10 	spinlock_t lock;
11 	cpumask_t cpu_attach_mask;
12 	atomic_t flush_count;
13 	unsigned int flush_mm;
14 	struct list_head pgtable_list;
15 	struct list_head gmap_list;
16 	unsigned long gmap_asce;
17 	unsigned long asce;
18 	unsigned long asce_limit;
19 	unsigned long vdso_base;
20 	/* The mmu context belongs to a secure guest. */
21 	atomic_t protected_count;
22 	/*
23 	 * The following bitfields need a down_write on the mm
24 	 * semaphore when they are written to. As they are only
25 	 * written once, they can be read without a lock.
26 	 *
27 	 * The mmu context allocates 4K page tables.
28 	 */
29 	unsigned int alloc_pgste:1;
30 	/* The mmu context uses extended page tables. */
31 	unsigned int has_pgste:1;
32 	/* The mmu context uses storage keys. */
33 	unsigned int uses_skeys:1;
34 	/* The mmu context uses CMM. */
35 	unsigned int uses_cmm:1;
36 	/*
37 	 * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
38 	 * Note that COW-sharing during fork() is currently always allowed.
39 	 */
40 	unsigned int allow_cow_sharing:1;
41 	/* The gmaps associated with this context are allowed to use huge pages. */
42 	unsigned int allow_gmap_hpage_1m:1;
43 } mm_context_t;
44 
45 #define INIT_MM_CONTEXT(name)						   \
46 	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
47 	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
48 	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
49 
50 #endif
51