x86/fpu: Add tracepoints to dump FPU state at key points

[mirror_ubuntu-artful-kernel.git] / arch / x86 / kernel / fpu / core.c

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 97027545a72dcd4c34964aff481ac1b7a94c0df7..7d564742e499af79ebd2aa2d5bb11ac59b19448b 100644 (file)
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -12,6 +12,9 @@
 
 #include <linux/hardirq.h>
 
+#define CREATE_TRACE_POINTS
+#include <asm/trace/fpu.h>
+
 /*
  * Represents the initial FPU state. It's mostly (but not completely) zeroes,
  * depending on the FPU hardware format:
@@ -192,6 +195,7 @@ void fpu__save(struct fpu *fpu)
        WARN_ON_FPU(fpu != &current->thread.fpu);
 
        preempt_disable();
+       trace_x86_fpu_before_save(fpu);
        if (fpu->fpregs_active) {
                if (!copy_fpregs_to_fpstate(fpu)) {
                        if (use_eager_fpu())
@@ -200,6 +204,7 @@ void fpu__save(struct fpu *fpu)
                                fpregs_deactivate(fpu);
                }
        }
+       trace_x86_fpu_after_save(fpu);
        preempt_enable();
 }
 EXPORT_SYMBOL_GPL(fpu__save);
@@ -275,6 +280,9 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
        }
        preempt_enable();
 
+       trace_x86_fpu_copy_src(src_fpu);
+       trace_x86_fpu_copy_dst(dst_fpu);
+
        return 0;
 }
 
@@ -288,7 +296,9 @@ void fpu__activate_curr(struct fpu *fpu)
 
        if (!fpu->fpstate_active) {
                fpstate_init(&fpu->state);
+               trace_x86_fpu_init_state(fpu);
 
+               trace_x86_fpu_activate_state(fpu);
                /* Safe to do for the current task: */
                fpu->fpstate_active = 1;
        }
@@ -314,7 +324,9 @@ void fpu__activate_fpstate_read(struct fpu *fpu)
        } else {
                if (!fpu->fpstate_active) {
                        fpstate_init(&fpu->state);
+                       trace_x86_fpu_init_state(fpu);
 
+                       trace_x86_fpu_activate_state(fpu);
                        /* Safe to do for current and for stopped child tasks: */
                        fpu->fpstate_active = 1;
                }
@@ -347,7 +359,9 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
                fpu->last_cpu = -1;
        } else {
                fpstate_init(&fpu->state);
+               trace_x86_fpu_init_state(fpu);
 
+               trace_x86_fpu_activate_state(fpu);
                /* Safe to do for stopped child tasks: */
                fpu->fpstate_active = 1;
        }
@@ -432,9 +446,11 @@ void fpu__restore(struct fpu *fpu)
 
        /* Avoid __kernel_fpu_begin() right after fpregs_activate() */
        kernel_fpu_disable();
+       trace_x86_fpu_before_restore(fpu);
        fpregs_activate(fpu);
        copy_kernel_to_fpregs(&fpu->state);
        fpu->counter++;
+       trace_x86_fpu_after_restore(fpu);
        kernel_fpu_enable();
 }
 EXPORT_SYMBOL_GPL(fpu__restore);
@@ -463,6 +479,8 @@ void fpu__drop(struct fpu *fpu)
 
        fpu->fpstate_active = 0;
 
+       trace_x86_fpu_dropped(fpu);
+
        preempt_enable();
 }