sh: Move over to dynamically allocated FPU context.

This follows the x86 xstate changes and implements a task_xstate slab
cache that is dynamically sized to match one of hard FP/soft FP/FPU-less.

This also tidies up and consolidates some of the SH-2A/SH-4 FPU
fragmentation. Now fpu state restorers are commonly defined, with the
init_fpu()/fpu_init() mess reworked to follow the x86 convention.
The fpu_init() register initialization has been replaced by xstate setup
followed by writing out to hardware via the standard restore path.

As init_fpu() now performs a slab allocation a secondary lighterweight
restorer is also introduced for the context switch.

In the future the DSP state will be rolled in here, too.

More work remains for math emulation and the SH-5 FPU, which presently
uses its own special (UP-only) interfaces.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 26 insertions, 29 deletions

diff --git a/arch/sh/include/asm/fpu.h b/arch/sh/include/asm/fpu.h
index fb6bbb9b1cc8..06c4281aab65 100644
--- a/arch/sh/include/asm/fpu.h
+++ b/arch/sh/include/asm/fpu.h
@@ -2,8 +2,8 @@
 #define __ASM_SH_FPU_H
 
 #ifndef __ASSEMBLY__
-#include <linux/preempt.h>
-#include <asm/ptrace.h>
+
+struct task_struct;
 
 #ifdef CONFIG_SH_FPU
 static inline void release_fpu(struct pt_regs *regs)
@@ -16,22 +16,23 @@ static inline void grab_fpu(struct pt_regs *regs)
         regs->sr &= ~SR_FD;
 }
 
-struct task_struct;
-
 extern void save_fpu(struct task_struct *__tsk);
-void fpu_state_restore(struct pt_regs *regs);
+extern void restore_fpu(struct task_struct *__tsk);
+extern void fpu_state_restore(struct pt_regs *regs);
+extern void __fpu_state_restore(void);
 #else
-
-#define save_fpu(tsk)           do { } while (0)
-#define release_fpu(regs)       do { } while (0)
-#define grab_fpu(regs)          do { } while (0)
-#define fpu_state_restore(regs) do { } while (0)
-
+#define save_fpu(tsk)                   do { } while (0)
+#define restore_fpu(tsk)                do { } while (0)
+#define release_fpu(regs)               do { } while (0)
+#define grab_fpu(regs)                  do { } while (0)
+#define fpu_state_restore(regs)         do { } while (0)
+#define __fpu_state_restore(regs)       do { } while (0)
 #endif
 
 struct user_regset;
 
 extern int do_fpu_inst(unsigned short, struct pt_regs *);
+extern int init_fpu(struct task_struct *);
 
 extern int fpregs_get(struct task_struct *target,
                       const struct user_regset *regset,
@@ -65,18 +66,6 @@ static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
         preempt_enable();
 }
 
-static inline int init_fpu(struct task_struct *tsk)
-{
-        if (tsk_used_math(tsk)) {
-                if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
-                        unlazy_fpu(tsk, task_pt_regs(tsk));
-                return 0;
-        }
-
-        set_stopped_child_used_math(tsk);
-        return 0;
-}
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_SH_FPU_H */
diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h
index 50b8c9c3fa4c..a359898206e8 100644
--- a/arch/sh/include/asm/processor_32.h
+++ b/arch/sh/include/asm/processor_32.h
@@ -90,11 +90,15 @@ struct sh_fpu_soft_struct {
         unsigned long entry_pc;
 };
 
-union sh_fpu_union {
-        struct sh_fpu_hard_struct hard;
-        struct sh_fpu_soft_struct soft;
+union thread_xstate {
+        struct sh_fpu_hard_struct hardfpu;
+        struct sh_fpu_soft_struct softfpu;
 };
 
+extern unsigned int xstate_size;
+extern void free_thread_xstate(struct task_struct *);
+extern struct kmem_cache *task_xstate_cachep;
+
 struct thread_struct {
         /* Saved registers when thread is descheduled */
         unsigned long sp;
@@ -103,13 +107,13 @@ struct thread_struct {
         /* Hardware debugging registers */
         unsigned long ubc_pc;
 
-        /* floating point info */
-        union sh_fpu_union fpu;
-
 #ifdef CONFIG_SH_DSP
         /* Dsp status information */
         struct sh_dsp_struct dsp_status;
 #endif
+
+        /* Extended processor state */
+        union thread_xstate *xstate;
 };
 
 /* Count of active tasks with UBC settings */
diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h
index 2c5b48edeab9..55a36fef6875 100644
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@ -97,6 +97,10 @@ static inline struct thread_info *current_thread_info(void)
 
 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
 extern void free_thread_info(struct thread_info *ti);
+extern void arch_task_cache_init(void);
+#define arch_task_cache_init arch_task_cache_init
+extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
+extern void init_thread_xstate(void);
 
 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR