This patch adds the necessary hooks to the X86 32-bit code
to support initialization, interrupts, context switching,
and termination of a perfmon session.

Signed-off-by: Stephane Eranian
--

Index: o/arch/x86/kernel/apic_32.c
================================================== =================
--- o.orig/arch/x86/kernel/apic_32.c 2008-06-04 11:09:10.000000000 +0200
+++ o/arch/x86/kernel/apic_32.c 2008-06-04 11:10:18.000000000 +0200
@@ -28,6 +28,7 @@
#include
#include
#include
+#include

#include
#include
@@ -1380,6 +1381,9 @@
#ifdef CONFIG_X86_MCE_P4THERMAL
set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
#endif
+#ifdef CONFIG_PERFMON
+ set_intr_gate(LOCAL_PERFMON_VECTOR, pmu_interrupt);
+#endif
}

/**
Index: o/arch/x86/kernel/entry_32.S
================================================== =================
--- o.orig/arch/x86/kernel/entry_32.S 2008-06-04 11:09:10.000000000 +0200
+++ o/arch/x86/kernel/entry_32.S 2008-06-04 11:10:18.000000000 +0200
@@ -464,7 +464,7 @@
ALIGN
RING0_PTREGS_FRAME # can't unwind into user space anyway
work_pending:
- testb $_TIF_NEED_RESCHED, %cl
+ testw $(_TIF_NEED_RESCHED|_TIF_PERFMON_WORK), %cx
jz work_notifysig
work_resched:
call schedule
Index: o/arch/x86/kernel/process_32.c
================================================== =================
--- o.orig/arch/x86/kernel/process_32.c 2008-06-04 11:09:10.000000000 +0200
+++ o/arch/x86/kernel/process_32.c 2008-06-04 11:10:18.000000000 +0200
@@ -36,6 +36,7 @@
#include
#include
#include
+#include
#include

#include
@@ -316,6 +317,7 @@
tss->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET;
put_cpu();
}
+ pfm_exit_thread();
}

void flush_thread(void)
@@ -372,6 +374,8 @@

savesegment(gs, p->thread.gs);

+ pfm_copy_thread(p);
+
tsk = current;
if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
@@ -486,6 +490,9 @@
prev = &prev_p->thread;
next = &next_p->thread;

+ if (test_tsk_thread_flag(prev_p, TIF_PERFMON_CTXSW))
+ pfm_ctxsw_out(prev_p, next_p);
+
debugctl = prev->debugctlmsr;
if (next->ds_area_msr != prev->ds_area_msr) {
/* we clear debugctl to make sure DS
@@ -498,6 +505,9 @@
if (next->debugctlmsr != debugctl)
update_debugctlmsr(next->debugctlmsr);

+ if (test_tsk_thread_flag(next_p, TIF_PERFMON_CTXSW))
+ pfm_ctxsw_in(prev_p, next_p);
+
if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
set_debugreg(next->debugreg0, 0);
set_debugreg(next->debugreg1, 1);
Index: o/arch/x86/kernel/signal_32.c
================================================== =================
--- o.orig/arch/x86/kernel/signal_32.c 2008-06-04 11:09:10.000000000 +0200
+++ o/arch/x86/kernel/signal_32.c 2008-06-04 11:10:18.000000000 +0200
@@ -18,6 +18,7 @@
#include
#include
#include
+#include
#include
#include

@@ -663,6 +664,10 @@
clear_thread_flag(TIF_SINGLESTEP);
}

+ /* process perfmon asynchronous work (e.g. block thread or reset) */
+ if (thread_info_flags & _TIF_PERFMON_WORK)
+ pfm_handle_work(regs);
+
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
Index: o/include/asm-x86/mach-default/entry_arch.h
================================================== =================
--- o.orig/include/asm-x86/mach-default/entry_arch.h 2008-06-04 11:09:10.000000000 +0200
+++ o/include/asm-x86/mach-default/entry_arch.h 2008-06-04 11:10:18.000000000 +0200
@@ -31,4 +31,8 @@
BUILD_INTERRUPT(thermal_interrupt,THERMAL_APIC_VEC TOR)
#endif

+#ifdef CONFIG_PERFMON
+BUILD_INTERRUPT(pmu_interrupt,LOCAL_PERFMON_VECTO R)
+#endif
+
#endif
Index: o/include/asm-x86/mach-default/irq_vectors.h
================================================== =================
--- o.orig/include/asm-x86/mach-default/irq_vectors.h 2008-06-04 11:09:10.000000000 +0200
+++ o/include/asm-x86/mach-default/irq_vectors.h 2008-06-04 11:10:18.000000000 +0200
@@ -56,6 +56,7 @@
* sources per level' errata.
*/
#define LOCAL_TIMER_VECTOR 0xef
+#define LOCAL_PERFMON_VECTOR 0xee

/*
* First APIC vector available to drivers: (vectors 0x30-0xee)
@@ -63,7 +64,7 @@
* levels. (0x80 is the syscall vector)
*/
#define FIRST_DEVICE_VECTOR 0x31
-#define FIRST_SYSTEM_VECTOR 0xef
+#define FIRST_SYSTEM_VECTOR 0xee

#define TIMER_IRQ 0

Index: o/include/asm-x86/thread_info_32.h
================================================== =================
--- o.orig/include/asm-x86/thread_info_32.h 2008-06-04 11:09:10.000000000 +0200
+++ o/include/asm-x86/thread_info_32.h 2008-06-04 11:10:18.000000000 +0200
@@ -132,6 +132,7 @@
#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
#define TIF_SECCOMP 7 /* secure computing */
#define TIF_HRTICK_RESCHED 9 /* reprogram hrtick timer */
+#define TIF_PERFMON_WORK 10 /* work for pfm_handle_work() */
#define TIF_MEMDIE 16
#define TIF_DEBUG 17 /* uses debug registers */
#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
@@ -141,6 +142,7 @@
#define TIF_DEBUGCTLMSR 22 /* uses thread_struct.debugctlmsr */
#define TIF_DS_AREA_MSR 23 /* uses thread_struct.ds_area_msr */
#define TIF_BTS_TRACE_TS 24 /* record scheduling event timestamps */
+#define TIF_PERFMON_CTXSW 25 /* perfmon needs ctxsw calls */

#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
@@ -159,6 +161,8 @@
#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
+#define _TIF_PERFMON_WORK (1 << TIF_PERFMON_WORK)
+#define _TIF_PERFMON_CTXSW (1 << TIF_PERFMON_CTXSW)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
@@ -168,9 +172,9 @@
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)

/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW \
- (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR | \
- _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
+#define _TIF_WORK_CTXSW \
+ (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR | \
+ _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS | _TIF_PERFMON_CTXSW)
#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)


--

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