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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-03-08 11:55:04 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-20 09:53:59 +0200 |
| commit | 6ea427bbbd4078297bb1dbd6c5cb83f3f48aac46 (patch) | |
| tree | 7ed574fcca3cae5d6a50211d43c3d5ab21620d3a /arch/s390/include/asm/gmap.h | |
| parent | s390/mm: extended gmap pte notifier (diff) | |
| download | linux-dev-6ea427bbbd4078297bb1dbd6c5cb83f3f48aac46.tar.xz linux-dev-6ea427bbbd4078297bb1dbd6c5cb83f3f48aac46.zip | |
s390/mm: add reference counter to gmap structure
Let's use a reference counter mechanism to control the lifetime of
gmap structures. This will be needed for further changes related to
gmap shadows.
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/gmap.h')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index 6897a0919446..e69853ce55da 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -15,6 +15,7 @@ * @guest_to_host: radix tree with guest to host address translation * @host_to_guest: radix tree with pointer to segment table entries * @guest_table_lock: spinlock to protect all entries in the guest page table + * @ref_count: reference counter for the gmap structure * @table: pointer to the page directory * @asce: address space control element for gmap page table * @pfault_enabled: defines if pfaults are applicable for the guest @@ -26,6 +27,7 @@ struct gmap { struct radix_tree_root guest_to_host; struct radix_tree_root host_to_guest; spinlock_t guest_table_lock; + atomic_t ref_count; unsigned long *table; unsigned long asce; unsigned long asce_end; @@ -44,8 +46,11 @@ struct gmap_notifier { unsigned long end); }; -struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit); -void gmap_free(struct gmap *gmap); +struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit); +void gmap_remove(struct gmap *gmap); +struct gmap *gmap_get(struct gmap *gmap); +void gmap_put(struct gmap *gmap); + void gmap_enable(struct gmap *gmap); void gmap_disable(struct gmap *gmap); int gmap_map_segment(struct gmap *gmap, unsigned long from, |