alpha: Add minimal support for software performance events

In the kernel the patch enables configuration of the perf event
option, adds the perf_event_open syscall, and includes a minimal
architecture specific asm/perf_event.h header file.

Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Matt Turner <mattst88@gmail.com>

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 4434481..bd7261e 100644 (file)
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -9,6 +9,7 @@ config ALPHA
        select HAVE_IDE
        select HAVE_OPROFILE
        select HAVE_SYSCALL_WRAPPERS
+       select HAVE_PERF_EVENTS
        help
          The Alpha is a 64-bit general-purpose processor designed and
          marketed by the Digital Equipment Corporation of blessed memory,

diff --git a/arch/alpha/include/asm/perf_event.h b/arch/alpha/include/asm/perf_event.h
new file mode 100644 (file)
index 0000000..3bef852
--- /dev/null
+++ b/arch/alpha/include/asm/perf_event.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_ALPHA_PERF_EVENT_H
+#define __ASM_ALPHA_PERF_EVENT_H
+
+/* Alpha only supports software events through this interface. */
+static inline void set_perf_event_pending(void) { }
+
+#define PERF_EVENT_INDEX_OFFSET 0
+
+#endif /* __ASM_ALPHA_PERF_EVENT_H */

diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
index 62e823e..804e531 100644 (file)
--- a/arch/alpha/include/asm/unistd.h
+++ b/arch/alpha/include/asm/unistd.h
@@ -448,10 +448,11 @@
 #define __NR_preadv                    490
 #define __NR_pwritev                   491
 #define __NR_rt_tgsigqueueinfo         492
+#define __NR_perf_event_open           493
 
 #ifdef __KERNEL__
 
-#define NR_SYSCALLS                    493
+#define NR_SYSCALLS                    494
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR

diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index d0bc3c8..09acb78 100644 (file)
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S
@@ -511,6 +511,7 @@ sys_call_table:
        .quad sys_preadv                                /* 490 */
        .quad sys_pwritev
        .quad sys_rt_tgsigqueueinfo
+       .quad sys_perf_event_open
 
        .size sys_call_table, . - sys_call_table
        .type sys_call_table, @object