s390: add support for transactional memory

Allow user-space processes to use transactional execution (TX).
If the TX facility is available user space programs can use
transactions for fine-grained serialization based on the data
objects that are referenced during a transaction. This is
useful for lockless data structures and speculative compiler
optimizations.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 0fff583d2c7c..46fe1fbf91c5 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -76,14 +76,20 @@ struct thread_struct {
         unsigned long gmap_addr;        /* address of last gmap fault. */
         struct per_regs per_user;       /* User specified PER registers */
         struct per_event per_event;     /* Cause of the last PER trap */
+        unsigned long per_flags;        /* Flags to control debug behavior */
         /* pfault_wait is used to block the process on a pfault event */
         unsigned long pfault_wait;
         struct list_head list;
         /* cpu runtime instrumentation */
         struct runtime_instr_cb *ri_cb;
         int ri_signum;
+#ifdef CONFIG_64BIT
+        unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
+#endif
 };
 
+#define PER_FLAG_NO_TE          1UL     /* Flag to disable transactions. */
+
 typedef struct thread_struct thread_struct;
 
 /*