Merge tag 'csky-for-linus-4.21' of git://github.com/c-sky/csky-linux

Pull arch/csky updates from Guo Ren:
 "Here are three main features (cpu_hotplug, basic ftrace, basic perf)
  and some bugfixes:

  Features:
   - Add CPU-hotplug support for SMP
   - Add ftrace with function trace and function graph trace
   - Add Perf support
   - Add EM_CSKY_OLD 39
   - optimize kernel panic print.
   - remove syscall_exit_work

  Bugfixes:
   - fix abiv2 mmap(... O_SYNC) failure
   - fix gdb coredump error
   - remove vdsp implement for kernel
   - fix qemu failure to bootup sometimes
   - fix ftrace call-graph panic
   - fix device tree node reference leak
   - remove meaningless header-y
   - fix save hi,lo,dspcr regs in switch_stack
   - remove unused members in processor.h"

* tag 'csky-for-linus-4.21' of git://github.com/c-sky/csky-linux:
  csky: Add perf support for C-SKY
  csky: Add EM_CSKY_OLD 39
  clocksource/drivers/c-sky: fixup ftrace call-graph panic
  csky: ftrace call graph supported.
  csky: basic ftrace supported
  csky: remove unused members in processor.h
  csky: optimize kernel panic print.
  csky: stacktrace supported.
  csky: CPU-hotplug supported for SMP
  clocksource/drivers/c-sky: fixup qemu fail to bootup sometimes.
  csky: fixup save hi,lo,dspcr regs in switch_stack.
  csky: remove syscall_exit_work
  csky: fixup remove vdsp implement for kernel.
  csky: bugfix gdb coredump error.
  csky: fixup abiv2 mmap(... O_SYNC) failed.
  csky: define syscall_get_arch()
  elf-em.h: add EM_CSKY
  csky: remove meaningless header-y
  csky: Don't leak device tree node reference

9 files changed, 47 insertions, 57 deletions

diff --git a/arch/csky/include/asm/elf.h b/arch/csky/include/asm/elf.h
index 773b133ca297..e1ec558278bc 100644
--- a/arch/csky/include/asm/elf.h
+++ b/arch/csky/include/asm/elf.h
@@ -7,7 +7,8 @@
 #include <asm/ptrace.h>
 #include <abi/regdef.h>
 
-#define ELF_ARCH 252
+#define ELF_ARCH EM_CSKY
+#define EM_CSKY_OLD 39
 
 /* CSKY Relocations */
 #define R_CSKY_NONE               0
@@ -31,14 +32,20 @@ typedef unsigned long elf_greg_t;
 
 typedef struct user_fp elf_fpregset_t;
 
-#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
+/*
+ * In gdb/bfd elf32-csky.c, csky_elf_grok_prstatus() use fixed size of
+ * elf_prstatus. It's 148 for abiv1 and 220 for abiv2, the size is enough
+ * for coredump and no need full sizeof(struct pt_regs).
+ */
+#define ELF_NGREG ((sizeof(struct pt_regs) / sizeof(elf_greg_t)) - 2)
 
 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 
 /*
  * This is used to ensure we don't load something for the wrong architecture.
  */
-#define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
+#define elf_check_arch(x) (((x)->e_machine == ELF_ARCH) || \
+			   ((x)->e_machine == EM_CSKY_OLD))
 
 /*
  * These are used to set parameters in the core dumps.
diff --git a/arch/csky/include/asm/ftrace.h b/arch/csky/include/asm/ftrace.h
new file mode 100644
index 000000000000..7547c45312a8
--- /dev/null
+++ b/arch/csky/include/asm/ftrace.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_FTRACE_H
+#define __ASM_CSKY_FTRACE_H
+
+#define MCOUNT_INSN_SIZE 4
+
+#define HAVE_FUNCTION_GRAPH_FP_TEST
+
+#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
+
+#endif /* __ASM_CSKY_FTRACE_H */
diff --git a/arch/csky/include/asm/perf_event.h b/arch/csky/include/asm/perf_event.h
new file mode 100644
index 000000000000..ea8193122294
--- /dev/null
+++ b/arch/csky/include/asm/perf_event.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_PERF_EVENT_H
+#define __ASM_CSKY_PERF_EVENT_H
+
+#endif /* __ASM_PERF_EVENT_ELF_H */
diff --git a/arch/csky/include/asm/processor.h b/arch/csky/include/asm/processor.h
index b1748659b2e9..8f454810514f 100644
--- a/arch/csky/include/asm/processor.h
+++ b/arch/csky/include/asm/processor.h
@@ -11,19 +11,13 @@
 #include <asm/cache.h>
 #include <abi/reg_ops.h>
 #include <abi/regdef.h>
+#include <abi/switch_context.h>
 #ifdef CONFIG_CPU_HAS_FPU
 #include <abi/fpu.h>
 #endif
 
 struct cpuinfo_csky {
-	unsigned long udelay_val;
 	unsigned long asid_cache;
-	/*
-	 * Capability and feature descriptor structure for CSKY CPU
-	 */
-	unsigned long options;
-	unsigned int processor_id[4];
-	unsigned int fpu_id;
 } __aligned(SMP_CACHE_BYTES);
 
 extern struct cpuinfo_csky cpu_data[];
@@ -49,13 +43,6 @@ extern struct cpuinfo_csky cpu_data[];
 struct thread_struct {
 	unsigned long  ksp;       /* kernel stack pointer */
 	unsigned long  sr;        /* saved status register */
-	unsigned long  esp0;      /* points to SR of stack frame */
-	unsigned long  hi;
-	unsigned long  lo;
-
-	/* Other stuff associated with the thread. */
-	unsigned long address;      /* Last user fault */
-	unsigned long error_code;
 
 	/* FPU regs */
 	struct user_fp __aligned(16) user_fp;
diff --git a/arch/csky/include/asm/smp.h b/arch/csky/include/asm/smp.h
index 4a929c4d6437..668b79ce29ea 100644
--- a/arch/csky/include/asm/smp.h
+++ b/arch/csky/include/asm/smp.h
@@ -21,6 +21,10 @@ void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq);
 
 #define raw_smp_processor_id()	(current_thread_info()->cpu)
 
+int __cpu_disable(void);
+
+void __cpu_die(unsigned int cpu);
+
 #endif /* CONFIG_SMP */
 
 #endif /* __ASM_CSKY_SMP_H */
diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h
index 926a64a8b4ee..d637445737b7 100644
--- a/arch/csky/include/asm/syscall.h
+++ b/arch/csky/include/asm/syscall.h
@@ -6,6 +6,7 @@
 #include <linux/sched.h>
 #include <linux/err.h>
 #include <abi/regdef.h>
+#include <uapi/linux/audit.h>
 
 static inline int
 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
@@ -68,4 +69,10 @@ syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
 	memcpy(&regs->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
 }
 
+static inline int
+syscall_get_arch(void)
+{
+	return AUDIT_ARCH_CSKY;
+}
+
 #endif	/* __ASM_SYSCALL_H */
diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h
index a2c69a7836f7..0e9d035d712b 100644
--- a/arch/csky/include/asm/thread_info.h
+++ b/arch/csky/include/asm/thread_info.h
@@ -10,6 +10,7 @@
 #include <asm/types.h>
 #include <asm/page.h>
 #include <asm/processor.h>
+#include <abi/switch_context.h>
 
 struct thread_info {
 	struct task_struct	*task;
@@ -36,6 +37,9 @@ struct thread_info {
 
 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
 
+#define thread_saved_fp(tsk) \
+	((unsigned long)(((struct switch_stack *)(tsk->thread.ksp))->r8))
+
 static inline struct thread_info *current_thread_info(void)
 {
 	unsigned long sp;
diff --git a/arch/csky/include/uapi/asm/Kbuild b/arch/csky/include/uapi/asm/Kbuild
index e02fd44e6447..7449fdeb973d 100644
--- a/arch/csky/include/uapi/asm/Kbuild
+++ b/arch/csky/include/uapi/asm/Kbuild
@@ -1,7 +1,5 @@
 include include/uapi/asm-generic/Kbuild.asm
 
-header-y += cachectl.h
-
 generic-y += auxvec.h
 generic-y += param.h
 generic-y += bpf_perf_event.h
diff --git a/arch/csky/include/uapi/asm/ptrace.h b/arch/csky/include/uapi/asm/ptrace.h
index f10d02c8b09e..a4eaa8ddf0b1 100644
--- a/arch/csky/include/uapi/asm/ptrace.h
+++ b/arch/csky/include/uapi/asm/ptrace.h
@@ -36,7 +36,7 @@ struct pt_regs {
 
 	unsigned long	rhi;
 	unsigned long	rlo;
-	unsigned long	pad; /* reserved */
+	unsigned long	dcsr;
 #endif
 };
 
@@ -48,43 +48,6 @@ struct user_fp {
 	unsigned long	reserved;
 };
 
-/*
- * Switch stack for switch_to after push pt_regs.
- *
- * ABI_CSKYV2: r4 ~ r11, r15 ~ r17, r26 ~ r30;
- * ABI_CSKYV1: r8 ~ r14, r15;
- */
-struct  switch_stack {
-#if defined(__CSKYABIV2__)
-	unsigned long   r4;
-	unsigned long   r5;
-	unsigned long   r6;
-	unsigned long   r7;
-	unsigned long   r8;
-	unsigned long   r9;
-	unsigned long   r10;
-	unsigned long   r11;
-#else
-	unsigned long   r8;
-	unsigned long   r9;
-	unsigned long   r10;
-	unsigned long   r11;
-	unsigned long   r12;
-	unsigned long   r13;
-	unsigned long   r14;
-#endif
-	unsigned long   r15;
-#if defined(__CSKYABIV2__)
-	unsigned long   r16;
-	unsigned long   r17;
-	unsigned long   r26;
-	unsigned long   r27;
-	unsigned long   r28;
-	unsigned long   r29;
-	unsigned long   r30;
-#endif
-};
-
 #ifdef __KERNEL__
 
 #define PS_S	0x80000000 /* Supervisor Mode */