[PATCH 1/2] powerpc/entry: convert to common and generic entry

[Luming Yu]

From: Yu Luming <luming.yu@xxxxxxxxx>

convert powerpc entry code in syscall and fault to use syscall_work
and irqentry_state as well as common calls from generic entry infrastructure.

Signed-off-by: Luming Yu <luming.yu@xxxxxxxxxxxx>
---
 arch/powerpc/Kconfig                   | 1 +
 arch/powerpc/include/asm/hw_irq.h      | 5 +++++
 arch/powerpc/include/asm/processor.h   | 6 ++++++
 arch/powerpc/include/asm/syscall.h     | 5 +++++
 arch/powerpc/include/asm/thread_info.h | 1 +
 arch/powerpc/kernel/syscall.c          | 6 +++++-
 arch/powerpc/mm/fault.c                | 5 +++++
 7 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e21f72bcb61f..e94e7e4bfd40 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -202,6 +202,7 @@ config PPC
 	select GENERIC_IRQ_SHOW_LEVEL
 	select GENERIC_PCI_IOMAP		if PCI
 	select GENERIC_PTDUMP
+        select GENERIC_ENTRY
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_VDSO_TIME_NS
diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index 317659fdeacf..a3d591784c95 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -216,6 +216,11 @@ static inline bool arch_irqs_disabled(void)
 	return arch_irqs_disabled_flags(arch_local_save_flags());
 }
 
+/*common entry*/
+static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
+{
+	return arch_irqs_disabled();
+}
 static inline void set_pmi_irq_pending(void)
 {
 	/*
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index b2c51d337e60..1292282f8b0e 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -383,6 +383,12 @@ int validate_sp(unsigned long sp, struct task_struct *p);
 int validate_sp_size(unsigned long sp, struct task_struct *p,
 		     unsigned long nbytes);
 
+/*for common entry*/
+static __always_inline bool on_thread_stack(void)
+{
+	return validate_sp(current_stack_pointer, current);
+}
+
 /*
  * Prefetch macros.
  */
diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
index 3dd36c5e334a..0e94806c7bfe 100644
--- a/arch/powerpc/include/asm/syscall.h
+++ b/arch/powerpc/include/asm/syscall.h
@@ -119,4 +119,9 @@ static inline int syscall_get_arch(struct task_struct *task)
 	else
 		return AUDIT_ARCH_PPC64;
 }
+
+static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
+{
+	return false;
+}
 #endif	/* _ASM_SYSCALL_H */
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 47e226032f9c..c52ca3aaebb5 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -58,6 +58,7 @@ struct thread_info {
 	unsigned int	cpu;
 #endif
 	unsigned long	local_flags;		/* private flags for thread */
+	unsigned long	syscall_work;
 #ifdef CONFIG_LIVEPATCH_64
 	unsigned long *livepatch_sp;
 #endif
diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.c
index 77fedb190c93..cbf0510ed10e 100644
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -3,6 +3,7 @@
 #include <linux/compat.h>
 #include <linux/context_tracking.h>
 #include <linux/randomize_kstack.h>
+#include <linux/entry-common.h>
 
 #include <asm/interrupt.h>
 #include <asm/kup.h>
@@ -131,7 +132,7 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
 		 * and the test against NR_syscalls will fail and the return
 		 * value to be used is in regs->gpr[3].
 		 */
-		r0 = do_syscall_trace_enter(regs);
+		syscall_enter_from_user_mode(regs, r0);
 		if (unlikely(r0 >= NR_syscalls))
 			return regs->gpr[3];
 
@@ -185,5 +186,8 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
 	 */
 	choose_random_kstack_offset(mftb());
 
+	/*common entry*/
+	syscall_exit_to_user_mode(regs);
+
 	return ret;
 }
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 9e49ede2bc1c..64c6eb06ebe8 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -23,6 +23,7 @@
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
+#include <linux/entry-common.h>
 #include <linux/highmem.h>
 #include <linux/extable.h>
 #include <linux/kprobes.h>
@@ -569,15 +570,19 @@ NOKPROBE_SYMBOL(___do_page_fault);
 static __always_inline void __do_page_fault(struct pt_regs *regs)
 {
 	long err;
+	irqentry_state_t state = irqentry_enter(regs);
 
 	err = ___do_page_fault(regs, regs->dar, regs->dsisr);
 	if (unlikely(err))
 		bad_page_fault(regs, err);
+	irqentry_exit(regs, state);
 }
 
 DEFINE_INTERRUPT_HANDLER(do_page_fault)
 {
+	irqentry_state_t state = irqentry_enter(regs);
 	__do_page_fault(regs);
+	irqentry_exit(regs, state);
 }
 
 #ifdef CONFIG_PPC_BOOK3S_64
-- 
2.42.0.windows.2