powerpc: create flush_all_to_thread()

Create a single function that flushes everything (FP, VMX, VSX, SPE).
Doing this all at once means we only do one MSR write.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index 8f85678..81d46a4 100644 (file)
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -27,6 +27,7 @@ extern void giveup_vsx(struct task_struct *);
 extern void enable_kernel_spe(void);
 extern void load_up_spe(struct task_struct *);
 extern void giveup_all(struct task_struct *);
+extern void flush_all_to_thread(struct task_struct *);
 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
 
 #ifdef CONFIG_PPC_FPU

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 4c087b9..7f437e7 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -367,6 +367,23 @@ void giveup_all(struct task_struct *tsk)
 }
 EXPORT_SYMBOL(giveup_all);
 
+void flush_all_to_thread(struct task_struct *tsk)
+{
+       if (tsk->thread.regs) {
+               preempt_disable();
+               BUG_ON(tsk != current);
+               giveup_all(tsk);
+
+#ifdef CONFIG_SPE
+               if (tsk->thread.regs->msr & MSR_SPE)
+                       tsk->thread.spefscr = mfspr(SPRN_SPEFSCR);
+#endif
+
+               preempt_enable();
+       }
+}
+EXPORT_SYMBOL(flush_all_to_thread);
+
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 void do_send_trap(struct pt_regs *regs, unsigned long address,
                  unsigned long error_code, int signal_code, int breakpt)
@@ -1137,10 +1154,7 @@ release_thread(struct task_struct *t)
  */
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
-       flush_fp_to_thread(src);
-       flush_altivec_to_thread(src);
-       flush_vsx_to_thread(src);
-       flush_spe_to_thread(src);
+       flush_all_to_thread(src);
        /*
         * Flush TM state out so we can copy it.  __switch_to_tm() does this
         * flush but it removes the checkpointed state from the current CPU and

diff --git a/arch/powerpc/kernel/swsusp.c b/arch/powerpc/kernel/swsusp.c
index eae33e1..6669b17 100644 (file)
--- a/arch/powerpc/kernel/swsusp.c
+++ b/arch/powerpc/kernel/swsusp.c
@@ -20,9 +20,7 @@ void save_processor_state(void)
         * flush out all the special registers so we don't need
         * to save them in the snapshot
         */
-       flush_fp_to_thread(current);
-       flush_altivec_to_thread(current);
-       flush_spe_to_thread(current);
+       flush_all_to_thread(current);
 
 #ifdef CONFIG_PPC64
        hard_irq_disable();

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 54b45b7..8e69470 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2700,9 +2700,8 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
                        goto out;
        }
 
-       flush_fp_to_thread(current);
-       flush_altivec_to_thread(current);
-       flush_vsx_to_thread(current);
+       flush_all_to_thread(current);
+
        vcpu->arch.wqp = &vcpu->arch.vcore->wq;
        vcpu->arch.pgdir = current->mm->pgd;
        vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;