s390: add support for runtime instrumentation

Allow user-space threads to use runtime instrumentation (RI). To enable RI
for a thread there is a new s390 specific system call, sys_s390_runtime_instr,
that takes as parameter a realtime signal number. If the RI facility is
available the system call sets up a control block for the calling thread with
the appropriate permissions for the thread to modify the control block.

The user-space thread can then use the store and modify RI instructions to
alter the control block and start/stop the instrumentation via RION/RIOFF.

If the user specified program buffer runs full RI triggers an external
interrupt. The external interrupt is translated to a real-time signal that
is delivered to the thread that enabled RI on that CPU. The number of
the real-time signal is the number specified in the RI system call. So,
user-space can select any available real-time signal number in case the
application itself uses real-time signals for other purposes.

The kernel saves the RI control blocks on task switch only if the running
thread was enabled for RI. Therefore, the performance impact on task switch
should be negligible if RI is not used.

RI is only enabled for user-space mode and is disabled for the supervisor
state.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index d5f08ea566ed..5c32bae6b760 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -235,6 +235,7 @@ typedef struct
 #define PSW_MASK_ASC            0x0000C000UL
 #define PSW_MASK_CC             0x00003000UL
 #define PSW_MASK_PM             0x00000F00UL
+#define PSW_MASK_RI             0x00000000UL
 #define PSW_MASK_EA             0x00000000UL
 #define PSW_MASK_BA             0x00000000UL
 
@@ -264,10 +265,11 @@ typedef struct
 #define PSW_MASK_ASC            0x0000C00000000000UL
 #define PSW_MASK_CC             0x0000300000000000UL
 #define PSW_MASK_PM             0x00000F0000000000UL
+#define PSW_MASK_RI             0x0000008000000000UL
 #define PSW_MASK_EA             0x0000000100000000UL
 #define PSW_MASK_BA             0x0000000080000000UL
 
-#define PSW_MASK_USER           0x00003F0180000000UL
+#define PSW_MASK_USER           0x00003F8180000000UL
 
 #define PSW_ADDR_AMODE          0x0000000000000000UL
 #define PSW_ADDR_INSN           0xFFFFFFFFFFFFFFFFUL