1 files changed, 58 insertions, 38 deletions

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 8f3ccddbdaf..84446fe46a5 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -35,27 +35,19 @@ void vfp_null_entry(void);
 void (*vfp_vector)(void) = vfp_null_entry;
 
 /*
- * Dual-use variable.
- * Used in startup: set to non-zero if VFP checks fail
- * After startup, holds VFP architecture
- */
-unsigned int VFP_arch;
-
-/*
  * The pointer to the vfpstate structure of the thread which currently
  * owns the context held in the VFP hardware, or NULL if the hardware
  * context is invalid.
- *
- * For UP, this is sufficient to tell which thread owns the VFP context.
- * However, for SMP, we also need to check the CPU number stored in the
- * saved state too to catch migrations.
  */
 union vfp_state *vfp_current_hw_state[NR_CPUS];
 
 /*
- * Is 'thread's most up to date state stored in this CPUs hardware?
- * Must be called from non-preemptible context.
+ * Dual-use variable.
+ * Used in startup: set to non-zero if VFP checks fail
+ * After startup, holds VFP architecture
  */
+unsigned int VFP_arch;
+
 static bool vfp_state_in_hw(unsigned int cpu, struct thread_info *thread)
 {
 #ifdef CONFIG_SMP
@@ -89,27 +81,21 @@ static void vfp_thread_flush(struct thread_info *thread)
 	union vfp_state *vfp = &thread->vfpstate;
 	unsigned int cpu;
 
+	memset(vfp, 0, sizeof(union vfp_state));
+
+	vfp->hard.fpexc = FPEXC_EN;
+	vfp->hard.fpscr = FPSCR_ROUND_NEAREST;
+
 	/*
 	 * Disable VFP to ensure we initialize it first.  We must ensure
-	 * that the modification of vfp_current_hw_state[] and hardware
-	 * disable are done for the same CPU and without preemption.
-	 *
-	 * Do this first to ensure that preemption won't overwrite our
-	 * state saving should access to the VFP be enabled at this point.
+	 * that the modification of vfp_current_hw_state[] and hardware disable
+	 * are done for the same CPU and without preemption.
 	 */
 	cpu = get_cpu();
 	if (vfp_current_hw_state[cpu] == vfp)
 		vfp_current_hw_state[cpu] = NULL;
 	fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
 	put_cpu();
-
-	memset(vfp, 0, sizeof(union vfp_state));
-
-	vfp->hard.fpexc = FPEXC_EN;
-	vfp->hard.fpscr = FPSCR_ROUND_NEAREST;
-#ifdef CONFIG_SMP
-	vfp->hard.cpu = NR_CPUS;
-#endif
 }
 
 static void vfp_thread_exit(struct thread_info *thread)
@@ -129,9 +115,6 @@ static void vfp_thread_copy(struct thread_info *thread)
 
 	vfp_sync_hwstate(parent);
 	thread->vfpstate = parent->vfpstate;
-#ifdef CONFIG_SMP
-	thread->vfpstate.hard.cpu = NR_CPUS;
-#endif
 }
 
 /*
@@ -177,8 +160,17 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 		 * case the thread migrates to a different CPU. The
 		 * restoring is done lazily.
 		 */
-		if ((fpexc & FPEXC_EN) && vfp_current_hw_state[cpu])
+		if ((fpexc & FPEXC_EN) && vfp_current_hw_state[cpu]) {
 			vfp_save_state(vfp_current_hw_state[cpu], fpexc);
+			vfp_current_hw_state[cpu]->hard.cpu = cpu;
+		}
+		/*
+		 * Thread migration, just force the reloading of the
+		 * state on the new CPU in case the VFP registers
+		 * contain stale data.
+		 */
+		if (thread->vfpstate.hard.cpu != cpu)
+			vfp_current_hw_state[cpu] = NULL;
 #endif
 
 		/*
@@ -449,6 +441,10 @@ static int vfp_pm_suspend(void)
 
 		/* disable, just in case */
 		fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
+	} else if (vfp_current_hw_state[ti->cpu]) {
+		fmxr(FPEXC, fpexc | FPEXC_EN);
+		vfp_save_state(vfp_current_hw_state[ti->cpu], fpexc);
+		fmxr(FPEXC, fpexc);
 	}
 
 	/* clear any information we had about last context state */
@@ -494,15 +490,15 @@ static void vfp_pm_init(void)
 static inline void vfp_pm_init(void) { }
 #endif /* CONFIG_CPU_PM */
 
-/*
- * Ensure that the VFP state stored in 'thread->vfpstate' is up to date
- * with the hardware state.
- */
 void vfp_sync_hwstate(struct thread_info *thread)
 {
 	unsigned int cpu = get_cpu();
 
-	if (vfp_state_in_hw(cpu, thread)) {
+	/*
+	 * If the thread we're interested in is the current owner of the
+	 * hardware VFP state, then we need to save its state.
+	 */
+	if (vfp_current_hw_state[cpu] == &thread->vfpstate) {
 		u32 fpexc = fmrx(FPEXC);
 
 		/*
@@ -516,13 +512,36 @@ void vfp_sync_hwstate(struct thread_info *thread)
 	put_cpu();
 }
 
-/* Ensure that the thread reloads the hardware VFP state on the next use. */
 void vfp_flush_hwstate(struct thread_info *thread)
 {
 	unsigned int cpu = get_cpu();
 
-	vfp_force_reload(cpu, thread);
+	/*
+	 * If the thread we're interested in is the current owner of the
+	 * hardware VFP state, then we need to save its state.
+	 */
+	if (vfp_current_hw_state[cpu] == &thread->vfpstate) {
+		u32 fpexc = fmrx(FPEXC);
 
+		fmxr(FPEXC, fpexc & ~FPEXC_EN);
+
+		/*
+		 * Set the context to NULL to force a reload the next time
+		 * the thread uses the VFP.
+		 */
+		vfp_current_hw_state[cpu] = NULL;
+	}
+
+#ifdef CONFIG_SMP
+	/*
+	 * For SMP we still have to take care of the case where the thread
+	 * migrates to another CPU and then back to the original CPU on which
+	 * the last VFP user is still the same thread. Mark the thread VFP
+	 * state as belonging to a non-existent CPU so that the saved one will
+	 * be reloaded in the above case.
+	 */
+	thread->vfpstate.hard.cpu = NR_CPUS;
+#endif
 	put_cpu();
 }
 
@@ -541,7 +560,8 @@ static int vfp_hotplug(struct notifier_block *b, unsigned long action,
 	void *hcpu)
 {
 	if (action == CPU_DYING || action == CPU_DYING_FROZEN) {
-		vfp_force_reload((long)hcpu, current_thread_info());
+		unsigned int cpu = (long)hcpu;
+		vfp_current_hw_state[cpu] = NULL;
 	} else if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
 		vfp_enable(NULL);
 	return NOTIFY_OK;