From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- .../powerpc/platforms/powernv/opal-tracepoints.c | 84 ++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 kernel/arch/powerpc/platforms/powernv/opal-tracepoints.c (limited to 'kernel/arch/powerpc/platforms/powernv/opal-tracepoints.c') diff --git a/kernel/arch/powerpc/platforms/powernv/opal-tracepoints.c b/kernel/arch/powerpc/platforms/powernv/opal-tracepoints.c new file mode 100644 index 000000000..e11273b23 --- /dev/null +++ b/kernel/arch/powerpc/platforms/powernv/opal-tracepoints.c @@ -0,0 +1,84 @@ +#include +#include +#include + +#ifdef HAVE_JUMP_LABEL +struct static_key opal_tracepoint_key = STATIC_KEY_INIT; + +void opal_tracepoint_regfunc(void) +{ + static_key_slow_inc(&opal_tracepoint_key); +} + +void opal_tracepoint_unregfunc(void) +{ + static_key_slow_dec(&opal_tracepoint_key); +} +#else +/* + * We optimise OPAL calls by placing opal_tracepoint_refcount + * directly in the TOC so we can check if the opal tracepoints are + * enabled via a single load. + */ + +/* NB: reg/unreg are called while guarded with the tracepoints_mutex */ +extern long opal_tracepoint_refcount; + +void opal_tracepoint_regfunc(void) +{ + opal_tracepoint_refcount++; +} + +void opal_tracepoint_unregfunc(void) +{ + opal_tracepoint_refcount--; +} +#endif + +/* + * Since the tracing code might execute OPAL calls we need to guard against + * recursion. + */ +static DEFINE_PER_CPU(unsigned int, opal_trace_depth); + +void __trace_opal_entry(unsigned long opcode, unsigned long *args) +{ + unsigned long flags; + unsigned int *depth; + + local_irq_save(flags); + + depth = this_cpu_ptr(&opal_trace_depth); + + if (*depth) + goto out; + + (*depth)++; + preempt_disable(); + trace_opal_entry(opcode, args); + (*depth)--; + +out: + local_irq_restore(flags); +} + +void __trace_opal_exit(long opcode, unsigned long retval) +{ + unsigned long flags; + unsigned int *depth; + + local_irq_save(flags); + + depth = this_cpu_ptr(&opal_trace_depth); + + if (*depth) + goto out; + + (*depth)++; + trace_opal_exit(opcode, retval); + preempt_enable(); + (*depth)--; + +out: + local_irq_restore(flags); +} -- cgit 1.2.3-korg