Merge tag 'nds32-for-linus-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

Pull nds32 updates from Greentime Hu:

 - Perf support

 - Power management support

 - FPU support

 - Hardware prefetcher support

 - Build error fixed

 - Performance enhancement

* tag 'nds32-for-linus-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux:
  nds32: support hardware prefetcher
  nds32: Fix the items of hwcap_str ordering issue.
  math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning
  math-emu/op-2.h: Use statement expressions to prevent negative constant shift
  nds32: support denormalized result through FP emulator
  nds32: Support FP emulation
  nds32: nds32 FPU port
  nds32: Remove duplicated include from pm.c
  nds32: Power management for nds32
  nds32: Add document for NDS32 PMU.
  nds32: Add perf call-graph support.
  nds32: Perf porting
  nds32: Fix bug in bitfield.h
  nds32: Fix gcc 8.0 compiler option incompatible.
  nds32: Fill all TLB entries with kernel image mapping
  nds32: Remove the redundant assignment

Documentation/devicetree/bindings/perf/nds32v3-pmu.txt

+* NDS32 Performance Monitor Units
+
+NDS32 core have a PMU for counting cpu and cache events like cache misses.
+The NDS32 PMU representation in the device tree should be done as under:
+
+Required properties:
+
+- compatible :
+	"andestech,nds32v3-pmu"
+
+- interrupts : The interrupt number for NDS32 PMU is 13.
+
+Example:
+pmu{
+	compatible = "andestech,nds32v3-pmu";
+	interrupts = <13>;
+}

arch/nds32/Kconfig

@@ -28,7 +28,9 @@ config NDS32
 	select HANDLE_DOMAIN_IRQ
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_DEBUG_KMEMLEAK
+	select HAVE_EXIT_THREAD
 	select HAVE_REGS_AND_STACK_ACCESS_API
+	select HAVE_PERF_EVENTS
 	select IRQ_DOMAIN
 	select LOCKDEP_SUPPORT
 	select MODULES_USE_ELF_RELA
@@ -91,3 +93,13 @@ endmenu
 menu "Kernel Features"
 source "kernel/Kconfig.hz"
 endmenu
+
+menu "Power management options"
+config SYS_SUPPORTS_APM_EMULATION
+	bool
+
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+
+source "kernel/power/Kconfig"
+endmenu

arch/nds32/Kconfig.cpu

@@ -7,6 +7,40 @@ config CPU_LITTLE_ENDIAN
 	bool "Little endian"
 	default y
 
+config FPU
+	bool "FPU support"
+	default n
+	help
+	  If FPU ISA is used in user space, this configuration shall be Y to
+          enable required support in kerenl such as fpu context switch and
+          fpu exception handler.
+
+	  If no FPU ISA is used in user space, say N.
+
+config LAZY_FPU
+	bool "lazy FPU support"
+	depends on FPU
+	default y
+	help
+	  Say Y here to enable the lazy FPU scheme. The lazy FPU scheme can
+          enhance system performance by reducing the context switch
+	  frequency of the FPU register.
+
+	  For nomal case, say Y.
+
+config SUPPORT_DENORMAL_ARITHMETIC
+	bool "Denormal arithmetic support"
+	depends on FPU
+	default n
+	help
+	  Say Y here to enable arithmetic of denormalized number. Enabling
+	  this feature can enhance the precision for tininess number.
+	  However, performance loss in float pointe calculations is
+	  possibly significant due to additional FPU exception.
+
+	  If the calculated tolerance for tininess number is not critical,
+	  say N to prevent performance loss.
+
 config HWZOL
 	bool "hardware zero overhead loop support"
 	depends on CPU_D10 || CPU_D15
@@ -143,6 +177,13 @@ config CACHE_L2
 	  Say Y here to enable L2 cache if your SoC are integrated with L2CC.
 	  If unsure, say N.
 
+config HW_PRE
+	bool "Enable hardware prefetcher"
+	default y
+	help
+	  Say Y here to enable hardware prefetcher feature.
+	  Only when CPU_VER.REV >= 0x09 can support.
+
 menu "Memory configuration"
 
 choice

arch/nds32/Makefile

@@ -5,10 +5,14 @@ KBUILD_DEFCONFIG := defconfig
 
 comma = ,
 
+
 ifdef CONFIG_FUNCTION_TRACER
 arch-y += -malways-save-lp -mno-relax
 endif
 
+# Avoid generating FPU instructions
+arch-y  += -mno-ext-fpu-sp -mno-ext-fpu-dp -mfloat-abi=soft
+
 KBUILD_CFLAGS	+= $(call cc-option, -mno-sched-prolog-epilog)
 KBUILD_CFLAGS	+= -mcmodel=large
 
@@ -26,6 +30,7 @@ export	TEXTADDR
 
 # If we have a machine-specific directory, then include it in the build.
 core-y				+= arch/nds32/kernel/ arch/nds32/mm/
+core-$(CONFIG_FPU)              += arch/nds32/math-emu/
 libs-y				+= arch/nds32/lib/
 
 ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'

arch/nds32/boot/dts/ae3xx.dts

@@ -82,4 +82,9 @@ mac0: ethernet@e0100000 {
 			interrupts = <18>;
 		};
 	};
+
+	pmu {
+		compatible = "andestech,nds32v3-pmu";
+		interrupts= <13>;
+	};
 };

arch/nds32/include/asm/Kbuild

@@ -36,6 +36,7 @@ generic-y += kprobes.h
 generic-y += kvm_para.h
 generic-y += limits.h
 generic-y += local.h
+generic-y += local64.h
 generic-y += mm-arch-hooks.h
 generic-y += mman.h
 generic-y += parport.h

arch/nds32/include/asm/bitfield.h

@@ -251,6 +251,11 @@
 #define ITYPE_mskSTYPE		( 0xF  << ITYPE_offSTYPE )
 #define ITYPE_mskCPID		( 0x3  << ITYPE_offCPID )
 
+/* Additional definitions of ITYPE register for FPU */
+#define FPU_DISABLE_EXCEPTION	(0x1  << ITYPE_offSTYPE)
+#define FPU_EXCEPTION		(0x2  << ITYPE_offSTYPE)
+#define FPU_CPID		0	/* FPU Co-Processor ID is 0 */
+
 #define NDS32_VECTOR_mskNONEXCEPTION	0x78
 #define NDS32_VECTOR_offEXCEPTION	8
 #define NDS32_VECTOR_offINTERRUPT	9
@@ -692,8 +697,8 @@
 #define PFM_CTL_offKU1		13	/* Enable user mode event counting for PFMC1 */
 #define PFM_CTL_offKU2		14	/* Enable user mode event counting for PFMC2 */
 #define PFM_CTL_offSEL0		15	/* The event selection for PFMC0 */
-#define PFM_CTL_offSEL1		21	/* The event selection for PFMC1 */
-#define PFM_CTL_offSEL2		27	/* The event selection for PFMC2 */
+#define PFM_CTL_offSEL1		16	/* The event selection for PFMC1 */
+#define PFM_CTL_offSEL2		22	/* The event selection for PFMC2 */
 /* bit 28:31 reserved */
 
 #define PFM_CTL_mskEN0		( 0x01  << PFM_CTL_offEN0 )
@@ -735,14 +740,20 @@
 #define N13MISC_CTL_offRTP	1	/* Disable Return Target Predictor */
 #define N13MISC_CTL_offPTEPF	2	/* Disable HPTWK L2 PTE pefetch */
 #define N13MISC_CTL_offSP_SHADOW_EN	4	/* Enable shadow stack pointers */
+#define MISC_CTL_offHWPRE      11      /* Enable HardWare PREFETCH */
 /* bit 6, 9:31 reserved */
 
 #define N13MISC_CTL_makBTB	( 0x1  << N13MISC_CTL_offBTB )
 #define N13MISC_CTL_makRTP	( 0x1  << N13MISC_CTL_offRTP )
 #define N13MISC_CTL_makPTEPF	( 0x1  << N13MISC_CTL_offPTEPF )
 #define N13MISC_CTL_makSP_SHADOW_EN	( 0x1  << N13MISC_CTL_offSP_SHADOW_EN )
+#define MISC_CTL_makHWPRE_EN     ( 0x1  << MISC_CTL_offHWPRE )
 
+#ifdef CONFIG_HW_PRE
+#define MISC_init	(N13MISC_CTL_makBTB|N13MISC_CTL_makRTP|N13MISC_CTL_makSP_SHADOW_EN|MISC_CTL_makHWPRE_EN)
+#else
 #define MISC_init	(N13MISC_CTL_makBTB|N13MISC_CTL_makRTP|N13MISC_CTL_makSP_SHADOW_EN)
+#endif
 
 /******************************************************************************
  * PRUSR_ACC_CTL (Privileged Resource User Access Control Registers)
@@ -926,6 +937,7 @@
 #define FPCSR_mskDNIT           ( 0x1  << FPCSR_offDNIT )
 #define FPCSR_mskRIT		( 0x1  << FPCSR_offRIT )
 #define FPCSR_mskALL		(FPCSR_mskIVO | FPCSR_mskDBZ | FPCSR_mskOVF | FPCSR_mskUDF | FPCSR_mskIEX)
+#define FPCSR_mskALLE_NO_UDFE	(FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE | FPCSR_mskIEXE)
 #define FPCSR_mskALLE		(FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE | FPCSR_mskUDFE | FPCSR_mskIEXE)
 #define FPCSR_mskALLT           (FPCSR_mskIVOT | FPCSR_mskDBZT | FPCSR_mskOVFT | FPCSR_mskUDFT | FPCSR_mskIEXT |FPCSR_mskDNIT | FPCSR_mskRIT)
 
@@ -946,6 +958,15 @@
 #define FPCFG_mskIMVER		( 0x1F  << FPCFG_offIMVER )
 #define FPCFG_mskAVER		( 0x1F  << FPCFG_offAVER )
 
+/* 8 Single precision or 4 double precision registers are available */
+#define SP8_DP4_reg		0
+/* 16 Single precision or 8 double precision registers are available */
+#define SP16_DP8_reg		1
+/* 32 Single precision or 16 double precision registers are available */
+#define SP32_DP16_reg		2
+/* 32 Single precision or 32 double precision registers are available */
+#define SP32_DP32_reg		3
+
 /******************************************************************************
  * fucpr: FUCOP_CTL (FPU and Coprocessor Enable Control Register)
  *****************************************************************************/

arch/nds32/include/asm/elf.h

@@ -9,6 +9,7 @@
  */
 
 #include <asm/ptrace.h>
+#include <asm/fpu.h>
 
 typedef unsigned long elf_greg_t;
 typedef unsigned long elf_freg_t[3];
@@ -159,8 +160,18 @@ struct elf32_hdr;
 
 #endif
 
+
+#if IS_ENABLED(CONFIG_FPU)
+#define FPU_AUX_ENT	NEW_AUX_ENT(AT_FPUCW, FPCSR_INIT)
+#else
+#define FPU_AUX_ENT	NEW_AUX_ENT(AT_IGNORE, 0)
+#endif
+
 #define ARCH_DLINFO						\
 do {								\
+	/* Optional FPU initialization */			\
+	FPU_AUX_ENT;						\
+								\
 	NEW_AUX_ENT(AT_SYSINFO_EHDR,				\
 		    (elf_addr_t)current->mm->context.vdso);	\
 } while (0)

arch/nds32/include/asm/fpu.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#ifndef __ASM_NDS32_FPU_H
+#define __ASM_NDS32_FPU_H
+
+#if IS_ENABLED(CONFIG_FPU)
+#ifndef __ASSEMBLY__
+#include <linux/sched/task_stack.h>
+#include <linux/preempt.h>
+#include <asm/ptrace.h>
+
+extern bool has_fpu;
+
+extern void save_fpu(struct task_struct *__tsk);
+extern void load_fpu(const struct fpu_struct *fpregs);
+extern bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs);
+extern int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu);
+
+#define test_tsk_fpu(regs)	(regs->fucop_ctl & FUCOP_CTL_mskCP0EN)
+
+/*
+ * Initially load the FPU with signalling NANS.  This bit pattern
+ * has the property that no matter whether considered as single or as
+ * double precision, it still represents a signalling NAN.
+ */
+
+#define sNAN64    0xFFFFFFFFFFFFFFFFULL
+#define sNAN32    0xFFFFFFFFUL
+
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+/*
+ * Denormalized number is unsupported by nds32 FPU. Hence the operation
+ * is treated as underflow cases when the final result is a denormalized
+ * number. To enhance precision, underflow exception trap should be
+ * enabled by default and kerenl will re-execute it by fpu emulator
+ * when getting underflow exception.
+ */
+#define FPCSR_INIT  FPCSR_mskUDFE
+#else
+#define FPCSR_INIT  0x0UL
+#endif
+
+extern const struct fpu_struct init_fpuregs;
+
+static inline void disable_ptreg_fpu(struct pt_regs *regs)
+{
+	regs->fucop_ctl &= ~FUCOP_CTL_mskCP0EN;
+}
+
+static inline void enable_ptreg_fpu(struct pt_regs *regs)
+{
+	regs->fucop_ctl |= FUCOP_CTL_mskCP0EN;
+}
+
+static inline void enable_fpu(void)
+{
+	unsigned long fucop_ctl;
+
+	fucop_ctl = __nds32__mfsr(NDS32_SR_FUCOP_CTL) | FUCOP_CTL_mskCP0EN;
+	__nds32__mtsr(fucop_ctl, NDS32_SR_FUCOP_CTL);
+	__nds32__isb();
+}
+
+static inline void disable_fpu(void)
+{
+	unsigned long fucop_ctl;
+
+	fucop_ctl = __nds32__mfsr(NDS32_SR_FUCOP_CTL) & ~FUCOP_CTL_mskCP0EN;
+	__nds32__mtsr(fucop_ctl, NDS32_SR_FUCOP_CTL);
+	__nds32__isb();
+}
+
+static inline void lose_fpu(void)
+{
+	preempt_disable();
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+	if (last_task_used_math == current) {
+		last_task_used_math = NULL;
+#else
+	if (test_tsk_fpu(task_pt_regs(current))) {
+#endif
+		save_fpu(current);
+	}
+	disable_ptreg_fpu(task_pt_regs(current));
+	preempt_enable();
+}
+
+static inline void own_fpu(void)
+{
+	preempt_disable();
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+	if (last_task_used_math != current) {
+		if (last_task_used_math != NULL)
+			save_fpu(last_task_used_math);
+		load_fpu(&current->thread.fpu);
+		last_task_used_math = current;
+	}
+#else
+	if (!test_tsk_fpu(task_pt_regs(current))) {
+		load_fpu(&current->thread.fpu);
+	}
+#endif
+	enable_ptreg_fpu(task_pt_regs(current));
+	preempt_enable();
+}
+
+#if !IS_ENABLED(CONFIG_LAZY_FPU)
+static inline void unlazy_fpu(struct task_struct *tsk)
+{
+	preempt_disable();
+	if (test_tsk_fpu(task_pt_regs(tsk)))
+		save_fpu(tsk);
+	preempt_enable();
+}
+#endif /* !CONFIG_LAZY_FPU */
+static inline void clear_fpu(struct pt_regs *regs)
+{
+	preempt_disable();
+	if (test_tsk_fpu(regs))
+		disable_ptreg_fpu(regs);
+	preempt_enable();
+}
+#endif /* CONFIG_FPU */
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_NDS32_FPU_H */

arch/nds32/include/asm/fpuemu.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#ifndef __ARCH_NDS32_FPUEMU_H
+#define __ARCH_NDS32_FPUEMU_H
+
+/*
+ * single precision
+ */
+
+void fadds(void *ft, void *fa, void *fb);
+void fsubs(void *ft, void *fa, void *fb);
+void fmuls(void *ft, void *fa, void *fb);
+void fdivs(void *ft, void *fa, void *fb);
+void fs2d(void *ft, void *fa);
+void fsqrts(void *ft, void *fa);
+void fnegs(void *ft, void *fa);
+int fcmps(void *ft, void *fa, void *fb, int cop);
+
+/*
+ * double precision
+ */
+void faddd(void *ft, void *fa, void *fb);
+void fsubd(void *ft, void *fa, void *fb);
+void fmuld(void *ft, void *fa, void *fb);
+void fdivd(void *ft, void *fa, void *fb);
+void fsqrtd(void *ft, void *fa);
+void fd2s(void *ft, void *fa);
+void fnegd(void *ft, void *fa);
+int fcmpd(void *ft, void *fa, void *fb, int cop);
+
+#endif /* __ARCH_NDS32_FPUEMU_H */

arch/nds32/include/asm/nds32_fpu_inst.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#ifndef __NDS32_FPU_INST_H
+#define __NDS32_FPU_INST_H
+
+#define cop0_op	0x35
+
+/*
+ * COP0 field of opcodes.
+ */
+#define fs1_op	0x0
+#define fs2_op  0x4
+#define fd1_op  0x8
+#define fd2_op  0xc
+
+/*
+ * FS1 opcode.
+ */
+enum fs1 {
+	fadds_op, fsubs_op, fcpynss_op, fcpyss_op,
+	fmadds_op, fmsubs_op, fcmovns_op, fcmovzs_op,
+	fnmadds_op, fnmsubs_op,
+	fmuls_op = 0xc, fdivs_op,
+	fs1_f2op_op = 0xf
+};
+
+/*
+ * FS1/F2OP opcode.
+ */
+enum fs1_f2 {
+	fs2d_op, fsqrts_op,
+	fui2s_op = 0x8, fsi2s_op = 0xc,
+	fs2ui_op = 0x10, fs2ui_z_op = 0x14,
+	fs2si_op = 0x18, fs2si_z_op = 0x1c
+};
+
+/*
+ * FS2 opcode.
+ */
+enum fs2 {
+	fcmpeqs_op, fcmpeqs_e_op, fcmplts_op, fcmplts_e_op,
+	fcmples_op, fcmples_e_op, fcmpuns_op, fcmpuns_e_op
+};
+
+/*
+ * FD1 opcode.
+ */
+enum fd1 {
+	faddd_op, fsubd_op, fcpynsd_op, fcpysd_op,
+	fmaddd_op, fmsubd_op, fcmovnd_op, fcmovzd_op,
+	fnmaddd_op, fnmsubd_op,
+	fmuld_op = 0xc, fdivd_op, fd1_f2op_op = 0xf
+};
+
+/*
+ * FD1/F2OP opcode.
+ */
+enum fd1_f2 {
+	fd2s_op, fsqrtd_op,
+	fui2d_op = 0x8, fsi2d_op = 0xc,
+	fd2ui_op = 0x10, fd2ui_z_op = 0x14,
+	fd2si_op = 0x18, fd2si_z_op = 0x1c
+};
+
+/*
+ * FD2 opcode.
+ */
+enum fd2 {
+	fcmpeqd_op, fcmpeqd_e_op, fcmpltd_op, fcmpltd_e_op,
+	fcmpled_op, fcmpled_e_op, fcmpund_op, fcmpund_e_op
+};
+
+#define NDS32Insn(x) x
+
+#define I_OPCODE_off			25
+#define NDS32Insn_OPCODE(x)		(NDS32Insn(x) >> I_OPCODE_off)
+
+#define I_OPCODE_offRt			20
+#define I_OPCODE_mskRt			(0x1fUL << I_OPCODE_offRt)
+#define NDS32Insn_OPCODE_Rt(x) \
+	((NDS32Insn(x) & I_OPCODE_mskRt) >> I_OPCODE_offRt)
+
+#define I_OPCODE_offRa			15
+#define I_OPCODE_mskRa			(0x1fUL << I_OPCODE_offRa)
+#define NDS32Insn_OPCODE_Ra(x) \
+	((NDS32Insn(x) & I_OPCODE_mskRa) >> I_OPCODE_offRa)
+
+#define I_OPCODE_offRb			10
+#define I_OPCODE_mskRb			(0x1fUL << I_OPCODE_offRb)
+#define NDS32Insn_OPCODE_Rb(x) \
+	((NDS32Insn(x) & I_OPCODE_mskRb) >> I_OPCODE_offRb)
+
+#define I_OPCODE_offbit1014		10
+#define I_OPCODE_mskbit1014		(0x1fUL << I_OPCODE_offbit1014)
+#define NDS32Insn_OPCODE_BIT1014(x) \
+	((NDS32Insn(x) & I_OPCODE_mskbit1014) >> I_OPCODE_offbit1014)
+
+#define I_OPCODE_offbit69		6
+#define I_OPCODE_mskbit69		(0xfUL << I_OPCODE_offbit69)
+#define NDS32Insn_OPCODE_BIT69(x) \
+	((NDS32Insn(x) & I_OPCODE_mskbit69) >> I_OPCODE_offbit69)
+
+#define I_OPCODE_offCOP0		0
+#define I_OPCODE_mskCOP0		(0x3fUL << I_OPCODE_offCOP0)
+#define NDS32Insn_OPCODE_COP0(x) \
+	((NDS32Insn(x) & I_OPCODE_mskCOP0) >> I_OPCODE_offCOP0)
+
+#endif /* __NDS32_FPU_INST_H */

arch/nds32/include/asm/perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2008-2018 Andes Technology Corporation */
+
+#ifndef __ASM_PERF_EVENT_H
+#define __ASM_PERF_EVENT_H
+
+/*
+ * This file is request by Perf,
+ * please refer to tools/perf/design.txt for more details
+ */
+struct pt_regs;
+unsigned long perf_instruction_pointer(struct pt_regs *regs);
+unsigned long perf_misc_flags(struct pt_regs *regs);
+#define perf_misc_flags(regs)   perf_misc_flags(regs)
+
+#endif

arch/nds32/include/asm/processor.h

@@ -35,6 +35,8 @@ struct thread_struct {
 	unsigned long address;
 	unsigned long trap_no;
 	unsigned long error_code;
+
+	struct fpu_struct fpu;
 };
 
 #define INIT_THREAD  {	}
@@ -72,6 +74,11 @@ struct task_struct;
 
 /* Free all resources held by a thread. */
 #define release_thread(thread) do { } while(0)
+#if IS_ENABLED(CONFIG_FPU)
+#if !IS_ENABLED(CONFIG_UNLAZU_FPU)
+extern struct task_struct *last_task_used_math;
+#endif
+#endif
 
 /* Prepare to copy thread state - unlazy all lazy status */
 #define prepare_to_copy(tsk)	do { } while (0)

arch/nds32/include/asm/sfp-machine.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+
+#include <asm/bitfield.h>
+
+#define _FP_W_TYPE_SIZE		32
+#define _FP_W_TYPE		unsigned long
+#define _FP_WS_TYPE		signed long
+#define _FP_I_TYPE		long
+
+#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
+#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1))
+#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2))
+
+#define _FP_MUL_MEAT_S(R, X, Y)				\
+	_FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_D(R, X, Y)				\
+	_FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_Q(R, X, Y)				\
+	_FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q, R, X, Y, umul_ppmm)
+
+#define _FP_MUL_MEAT_DW_S(R, X, Y)			\
+	_FP_MUL_MEAT_DW_1_wide(_FP_WFRACBITS_S, R, X, Y, umul_ppmm)
+#define _FP_MUL_MEAT_DW_D(R, X, Y)			\
+	_FP_MUL_MEAT_DW_2_wide(_FP_WFRACBITS_D, R, X, Y, umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R, X, Y)	_FP_DIV_MEAT_1_udiv_norm(S, R, X, Y)
+#define _FP_DIV_MEAT_D(R, X, Y)	_FP_DIV_MEAT_2_udiv(D, R, X, Y)
+
+#define _FP_NANFRAC_S		((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D		((_FP_QNANBIT_D << 1) - 1), -1
+#define _FP_NANFRAC_Q		((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
+#define _FP_NANSIGN_S		0
+#define _FP_NANSIGN_D		0
+#define _FP_NANSIGN_Q		0
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)			\
+do {								\
+	if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)	\
+	  && !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs)) { \
+		R##_s = Y##_s;					\
+		_FP_FRAC_COPY_##wc(R, Y);			\
+	} else {						\
+		R##_s = X##_s;					\
+		_FP_FRAC_COPY_##wc(R, X);			\
+	}							\
+	R##_c = FP_CLS_NAN;					\
+} while (0)
+
+#define __FPU_FPCSR	(current->thread.fpu.fpcsr)
+
+/* Obtain the current rounding mode. */
+#define FP_ROUNDMODE                    \
+({                                      \
+	__FPU_FPCSR & FPCSR_mskRM;      \
+})
+
+#define FP_RND_NEAREST		0
+#define FP_RND_PINF		1
+#define FP_RND_MINF		2
+#define FP_RND_ZERO		3
+
+#define FP_EX_INVALID		FPCSR_mskIVO
+#define FP_EX_DIVZERO		FPCSR_mskDBZ
+#define FP_EX_OVERFLOW		FPCSR_mskOVF
+#define FP_EX_UNDERFLOW		FPCSR_mskUDF
+#define FP_EX_INEXACT		FPCSR_mskIEX
+
+#define SF_CEQ	2
+#define SF_CLT	1
+#define SF_CGT	3
+#define SF_CUN	4
+
+#include <asm/byteorder.h>
+
+#ifdef __BIG_ENDIAN__
+#define __BYTE_ORDER __BIG_ENDIAN
+#define __LITTLE_ENDIAN 0
+#else
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#define __BIG_ENDIAN 0
+#endif
+
+#define abort() do { } while (0)
+#define umul_ppmm(w1, w0, u, v)						\
+do {									\
+	UWtype __x0, __x1, __x2, __x3;                                  \
+	UHWtype __ul, __vl, __uh, __vh;                                 \
+									\
+	__ul = __ll_lowpart(u);						\
+	__uh = __ll_highpart(u);					\
+	__vl = __ll_lowpart(v);						\
+	__vh = __ll_highpart(v);					\
+									\
+	__x0 = (UWtype) __ul * __vl;                                    \
+	__x1 = (UWtype) __ul * __vh;                                    \
+	__x2 = (UWtype) __uh * __vl;                                    \
+	__x3 = (UWtype) __uh * __vh;                                    \
+									\
+	__x1 += __ll_highpart(__x0);					\
+	__x1 += __x2;							\
+	if (__x1 < __x2)						\
+		__x3 += __ll_B;						\
+									\
+	(w1) = __x3 + __ll_highpart(__x1);				\
+	(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);	\
+} while (0)
+
+#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
+do { \
+	UWtype __x; \
+	__x = (al) + (bl); \
+	(sh) = (ah) + (bh) + (__x < (al)); \
+	(sl) = __x; \
+} while (0)
+
+#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+do { \
+	UWtype __x; \
+	__x = (al) - (bl); \
+	(sh) = (ah) - (bh) - (__x > (al)); \
+	(sl) = __x; \
+} while (0)
+
+#define udiv_qrnnd(q, r, n1, n0, d)				\
+do {								\
+	UWtype __d1, __d0, __q1, __q0, __r1, __r0, __m;		\
+	__d1 = __ll_highpart(d);				\
+	__d0 = __ll_lowpart(d);					\
+								\
+	__r1 = (n1) % __d1;					\
+	__q1 = (n1) / __d1;					\
+	__m = (UWtype) __q1 * __d0;				\
+	__r1 = __r1 * __ll_B | __ll_highpart(n0);		\
+	if (__r1 < __m)	{					\
+		__q1--, __r1 += (d);				\
+		if (__r1 >= (d))				\
+			if (__r1 < __m)				\
+				__q1--, __r1 += (d);		\
+	}							\
+	__r1 -= __m;						\
+	__r0 = __r1 % __d1;					\
+	__q0 = __r1 / __d1;					\
+	__m = (UWtype) __q0 * __d0;				\
+	__r0 = __r0 * __ll_B | __ll_lowpart(n0);		\
+	if (__r0 < __m)	{					\
+		__q0--, __r0 += (d);				\
+		if (__r0 >= (d))				\
+			if (__r0 < __m)				\
+				__q0--, __r0 += (d);		\
+	}							\
+	__r0 -= __m;						\
+	(q) = (UWtype) __q1 * __ll_B | __q0;			\
+	(r) = __r0;						\
+} while (0)

arch/nds32/include/asm/stacktrace.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2008-2018 Andes Technology Corporation */
+
+#ifndef __ASM_STACKTRACE_H
+#define __ASM_STACKTRACE_H
+
+/* Kernel callchain */
+struct stackframe {
+	unsigned long fp;
+	unsigned long sp;
+	unsigned long lp;
+};
+
+/*
+ * struct frame_tail: User callchain
+ * IMPORTANT:
+ * This struct is used for call-stack walking,
+ * the order and types matters.
+ * Do not use array, it only stores sizeof(pointer)
+ *
+ * The details can refer to arch/arm/kernel/perf_event.c
+ */
+struct frame_tail {
+	unsigned long stack_fp;
+	unsigned long stack_lp;
+};
+
+/* For User callchain with optimize for size */
+struct frame_tail_opt_size {
+	unsigned long stack_r6;
+	unsigned long stack_fp;
+	unsigned long stack_gp;
+	unsigned long stack_lp;
+};
+
+extern void
+get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph);
+
+#endif /* __ASM_STACKTRACE_H */

arch/nds32/include/asm/suspend.h

+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2008-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_SUSPEND_H
+#define __ASM_NDS32_SUSPEND_H
+
+extern void suspend2ram(void);
+extern void cpu_resume(void);
+extern unsigned long wake_mask;
+
+#endif

arch/nds32/include/asm/syscalls.h

@@ -7,6 +7,7 @@
 asmlinkage long sys_cacheflush(unsigned long addr, unsigned long len, unsigned int op);
 asmlinkage long sys_fadvise64_64_wrapper(int fd, int advice, loff_t offset, loff_t len);
 asmlinkage long sys_rt_sigreturn_wrapper(void);
+asmlinkage long sys_udftrap(int option);
 
 #include <asm-generic/syscalls.h>
 

arch/nds32/include/uapi/asm/auxvec.h

@@ -4,6 +4,13 @@
 #ifndef __ASM_AUXVEC_H
 #define __ASM_AUXVEC_H
 
+/*
+ * This entry gives some information about the FPU initialization
+ * performed by the kernel.
+ */
+#define AT_FPUCW	18	/* Used FPU control word.  */
+
+
 /* VDSO location */
 #define AT_SYSINFO_EHDR	33
 

arch/nds32/include/uapi/asm/sigcontext.h

@@ -9,6 +9,19 @@
  * before the signal handler was invoked.  Note: only add new entries
  * to the end of the structure.
  */
+struct fpu_struct {
+	unsigned long long fd_regs[32];
+	unsigned long fpcsr;
+	/*
+	 * UDF_trap is used to recognize whether underflow trap is enabled
+	 * or not. When UDF_trap == 1, this process will be traped and then
+	 * get a SIGFPE signal when encountering an underflow exception.
+	 * UDF_trap is only modified through setfputrap syscall. Therefore,
+	 * UDF_trap needn't be saved or loaded to context in each context
+	 * switch.
+	 */
+	unsigned long UDF_trap;
+};
 
 struct zol_struct {
 	unsigned long nds32_lc;	/* $LC */
@@ -54,6 +67,7 @@ struct sigcontext {
 	unsigned long fault_address;
 	unsigned long used_math_flag;
 	/* FPU Registers */
+	struct fpu_struct fpu;
 	struct zol_struct zol;
 };
 

arch/nds32/include/uapi/asm/udftrap.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2005-2018 Andes Technology Corporation */
+#ifndef	_ASM_SETFPUTRAP
+#define	_ASM_SETFPUTRAP
+
+/*
+ * Options for setfputrap system call
+ */
+#define	DISABLE_UDFTRAP	0	/* disable underflow exception trap */
+#define	ENABLE_UDFTRAP	1	/* enable undeflos exception trap */
+#define	GET_UDFTRAP	2	/* only get undeflos exception trap status */
+
+#endif /* _ASM_CACHECTL */

arch/nds32/include/uapi/asm/unistd.h

@@ -9,4 +9,6 @@
 
 /* Additional NDS32 specific syscalls. */
 #define __NR_cacheflush		(__NR_arch_specific_syscall)
+#define __NR_udftrap		(__NR_arch_specific_syscall + 1)
 __SYSCALL(__NR_cacheflush, sys_cacheflush)
+__SYSCALL(__NR_udftrap, sys_udftrap)

arch/nds32/kernel/Makefile

@@ -4,7 +4,6 @@
 
 CPPFLAGS_vmlinux.lds	:= -DTEXTADDR=$(TEXTADDR)
 AFLAGS_head.o		:= -DTEXTADDR=$(TEXTADDR)
-
 # Object file lists.
 
 obj-y			:= ex-entry.o ex-exit.o ex-scall.o irq.o \
@@ -14,11 +13,15 @@ obj-y			:= ex-entry.o ex-exit.o ex-scall.o irq.o \
 
 obj-$(CONFIG_MODULES)		+= nds32_ksyms.o module.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
+obj-$(CONFIG_FPU)		+= fpu.o
 obj-$(CONFIG_OF)		+= devtree.o
 obj-$(CONFIG_CACHE_L2)		+= atl2c.o
-
+obj-$(CONFIG_PERF_EVENTS) += perf_event_cpu.o
+obj-$(CONFIG_PM)		+= pm.o sleep.o
 extra-y := head.o vmlinux.lds
 
+CFLAGS_fpu.o += -mext-fpu-sp -mext-fpu-dp
+
 
 obj-y				+= vdso/
 

arch/nds32/kernel/ex-entry.S

@@ -7,6 +7,7 @@
 #include <asm/errno.h>
 #include <asm/asm-offsets.h>
 #include <asm/page.h>
+#include <asm/fpu.h>
 
 #ifdef CONFIG_HWZOL
 	.macro push_zol
@@ -15,12 +16,31 @@
 	mfusr	$r16, $LC
 	.endm
 #endif
+	.macro  skip_save_fucop_ctl
+#if defined(CONFIG_FPU)
+skip_fucop_ctl:
+	smw.adm $p0, [$sp], $p0, #0x1
+	j fucop_ctl_done
+#endif
+	.endm
 
 	.macro	save_user_regs
-
+#if defined(CONFIG_FPU)
+	sethi   $p0, hi20(has_fpu)
+	lbsi 	$p0, [$p0+lo12(has_fpu)]
+	beqz	$p0, skip_fucop_ctl
+	mfsr    $p0, $FUCOP_CTL
+	smw.adm $p0, [$sp], $p0, #0x1
+	bclr    $p0, $p0, #FUCOP_CTL_offCP0EN
+	mtsr    $p0, $FUCOP_CTL
+fucop_ctl_done:
+	/* move $SP to the bottom of pt_regs */
+	addi    $sp, $sp, -FUCOP_CTL_OFFSET
+#else
 	smw.adm $sp, [$sp], $sp, #0x1
 	/* move $SP to the bottom of pt_regs */
 	addi    $sp, $sp, -OSP_OFFSET
+#endif
 
 	/* push $r0 ~ $r25 */
 	smw.bim $r0, [$sp], $r25
@@ -79,6 +99,7 @@ exception_handlers:
 	.long	eh_syscall		!Syscall
 	.long	asm_do_IRQ		!IRQ
 
+	skip_save_fucop_ctl
 common_exception_handler:
 	save_user_regs
 	mfsr	$p0, $ITYPE
@@ -103,7 +124,6 @@ common_exception_handler:
 	mtsr	$r21, $PSW
 	dsb
 	jr	$p1
-
 	/* syscall */
 1:
 	addi	$p1, $p0, #-NDS32_VECTOR_offEXCEPTION

arch/nds32/kernel/ex-exit.S

@@ -8,6 +8,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/current.h>
+#include <asm/fpu.h>
 
 
 
@@ -22,10 +23,18 @@
 	.macro	restore_user_regs_first
 	setgie.d
 	isb
-
+#if defined(CONFIG_FPU)
+	addi    $sp, $sp, OSP_OFFSET
+	lmw.adm $r12, [$sp], $r25, #0x0
+	sethi   $p0, hi20(has_fpu)
+	lbsi 	$p0, [$p0+lo12(has_fpu)]
+	beqz	$p0, 2f
+	mtsr    $r25, $FUCOP_CTL
+2:
+#else
 	addi	$sp, $sp, FUCOP_CTL_OFFSET
-
 	lmw.adm $r12, [$sp], $r24, #0x0
+#endif
 	mtsr	$r12, $SP_USR
 	mtsr	$r13, $IPC
 #ifdef CONFIG_HWZOL

arch/nds32/kernel/ex-scall.S

@@ -19,11 +19,13 @@ ENTRY(__switch_to)
 
 	la	$p0, __entry_task
 	sw	$r1, [$p0]
-	move	$p1, $r0
-	addi	$p1, $p1, #THREAD_CPU_CONTEXT
+	addi	$p1, $r0, #THREAD_CPU_CONTEXT
 	smw.bi 	$r6, [$p1], $r14, #0xb		! push r6~r14, fp, lp, sp
 	move	$r25, $r1
-	addi	$r1, $r1, #THREAD_CPU_CONTEXT
+#if defined(CONFIG_FPU)
+	call	_switch_fpu
+#endif
+	addi	$r1, $r25, #THREAD_CPU_CONTEXT
 	lmw.bi 	$r6, [$r1], $r14, #0xb		! pop r6~r14, fp, lp, sp
 	ret
 

arch/nds32/kernel/fpu.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/sched/signal.h>
+#include <asm/processor.h>
+#include <asm/user.h>
+#include <asm/io.h>
+#include <asm/bitfield.h>
+#include <asm/fpu.h>
+
+const struct fpu_struct init_fpuregs = {
+	.fd_regs = {[0 ... 31] = sNAN64},
+	.fpcsr = FPCSR_INIT,
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+	.UDF_trap = 0
+#endif
+};
+
+void save_fpu(struct task_struct *tsk)
+{
+	unsigned int fpcfg, fpcsr;
+
+	enable_fpu();
+	fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
+	switch (fpcfg) {
+	case SP32_DP32_reg:
+		asm volatile ("fsdi $fd31, [%0+0xf8]\n\t"
+			      "fsdi $fd30, [%0+0xf0]\n\t"
+			      "fsdi $fd29, [%0+0xe8]\n\t"
+			      "fsdi $fd28, [%0+0xe0]\n\t"
+			      "fsdi $fd27, [%0+0xd8]\n\t"
+			      "fsdi $fd26, [%0+0xd0]\n\t"
+			      "fsdi $fd25, [%0+0xc8]\n\t"
+			      "fsdi $fd24, [%0+0xc0]\n\t"
+			      "fsdi $fd23, [%0+0xb8]\n\t"
+			      "fsdi $fd22, [%0+0xb0]\n\t"
+			      "fsdi $fd21, [%0+0xa8]\n\t"
+			      "fsdi $fd20, [%0+0xa0]\n\t"
+			      "fsdi $fd19, [%0+0x98]\n\t"
+			      "fsdi $fd18, [%0+0x90]\n\t"
+			      "fsdi $fd17, [%0+0x88]\n\t"
+			      "fsdi $fd16, [%0+0x80]\n\t"
+			      :	/* no output */
+			      : "r" (&tsk->thread.fpu)
+			      : "memory");
+		/* fall through */
+	case SP32_DP16_reg:
+		asm volatile ("fsdi $fd15, [%0+0x78]\n\t"
+			      "fsdi $fd14, [%0+0x70]\n\t"
+			      "fsdi $fd13, [%0+0x68]\n\t"
+			      "fsdi $fd12, [%0+0x60]\n\t"
+			      "fsdi $fd11, [%0+0x58]\n\t"
+			      "fsdi $fd10, [%0+0x50]\n\t"
+			      "fsdi $fd9,  [%0+0x48]\n\t"
+			      "fsdi $fd8,  [%0+0x40]\n\t"
+			      :	/* no output */
+			      : "r" (&tsk->thread.fpu)
+			      : "memory");
+		/* fall through */
+	case SP16_DP8_reg:
+		asm volatile ("fsdi $fd7,  [%0+0x38]\n\t"
+			      "fsdi $fd6,  [%0+0x30]\n\t"
+			      "fsdi $fd5,  [%0+0x28]\n\t"
+			      "fsdi $fd4,  [%0+0x20]\n\t"
+			      :	/* no output */
+			      : "r" (&tsk->thread.fpu)
+			      : "memory");
+		/* fall through */
+	case SP8_DP4_reg:
+		asm volatile ("fsdi $fd3,  [%1+0x18]\n\t"
+			      "fsdi $fd2,  [%1+0x10]\n\t"
+			      "fsdi $fd1,  [%1+0x8]\n\t"
+			      "fsdi $fd0,  [%1+0x0]\n\t"
+			      "fmfcsr	%0\n\t"
+			      "swi  %0, [%1+0x100]\n\t"
+			      : "=&r" (fpcsr)
+			      : "r"(&tsk->thread.fpu)
+			      : "memory");
+	}
+	disable_fpu();
+}
+
+void load_fpu(const struct fpu_struct *fpregs)
+{
+	unsigned int fpcfg, fpcsr;
+
+	enable_fpu();
+	fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
+	switch (fpcfg) {
+	case SP32_DP32_reg:
+		asm volatile ("fldi $fd31, [%0+0xf8]\n\t"
+			      "fldi $fd30, [%0+0xf0]\n\t"
+			      "fldi $fd29, [%0+0xe8]\n\t"
+			      "fldi $fd28, [%0+0xe0]\n\t"
+			      "fldi $fd27, [%0+0xd8]\n\t"
+			      "fldi $fd26, [%0+0xd0]\n\t"
+			      "fldi $fd25, [%0+0xc8]\n\t"
+			      "fldi $fd24, [%0+0xc0]\n\t"
+			      "fldi $fd23, [%0+0xb8]\n\t"
+			      "fldi $fd22, [%0+0xb0]\n\t"
+			      "fldi $fd21, [%0+0xa8]\n\t"
+			      "fldi $fd20, [%0+0xa0]\n\t"
+			      "fldi $fd19, [%0+0x98]\n\t"
+			      "fldi $fd18, [%0+0x90]\n\t"
+			      "fldi $fd17, [%0+0x88]\n\t"
+			      "fldi $fd16, [%0+0x80]\n\t"
+			      :	/* no output */
+			      : "r" (fpregs));
+		/* fall through */
+	case SP32_DP16_reg:
+		asm volatile ("fldi $fd15, [%0+0x78]\n\t"
+			      "fldi $fd14, [%0+0x70]\n\t"
+			      "fldi $fd13, [%0+0x68]\n\t"
+			      "fldi $fd12, [%0+0x60]\n\t"
+			      "fldi $fd11, [%0+0x58]\n\t"
+			      "fldi $fd10, [%0+0x50]\n\t"
+			      "fldi $fd9,  [%0+0x48]\n\t"
+			      "fldi $fd8,  [%0+0x40]\n\t"
+			      :	/* no output */
+			      : "r" (fpregs));
+		/* fall through */
+	case SP16_DP8_reg:
+		asm volatile ("fldi $fd7,  [%0+0x38]\n\t"
+			      "fldi $fd6,  [%0+0x30]\n\t"
+			      "fldi $fd5,  [%0+0x28]\n\t"
+			      "fldi $fd4,  [%0+0x20]\n\t"
+			      :	/* no output */
+			      : "r" (fpregs));
+		/* fall through */
+	case SP8_DP4_reg:
+		asm volatile ("fldi $fd3,  [%1+0x18]\n\t"
+			      "fldi $fd2,  [%1+0x10]\n\t"
+			      "fldi $fd1,  [%1+0x8]\n\t"
+			      "fldi $fd0,  [%1+0x0]\n\t"
+			      "lwi  %0, [%1+0x100]\n\t"
+			      "fmtcsr	%0\n\t":"=&r" (fpcsr)
+			      : "r"(fpregs));
+	}
+	disable_fpu();
+}
+void store_fpu_for_suspend(void)
+{
+#ifdef CONFIG_LAZY_FPU
+	if (last_task_used_math != NULL)
+		save_fpu(last_task_used_math);
+	last_task_used_math = NULL;
+#else
+	if (!used_math())
+		return;
+	unlazy_fpu(current);
+#endif
+	clear_fpu(task_pt_regs(current));
+}
+inline void do_fpu_context_switch(struct pt_regs *regs)
+{
+	/* Enable to use FPU. */
+
+	if (!user_mode(regs)) {
+		pr_err("BUG: FPU is used in kernel mode.\n");
+		BUG();
+		return;
+	}
+
+	enable_ptreg_fpu(regs);
+#ifdef CONFIG_LAZY_FPU	//Lazy FPU is used
+	if (last_task_used_math == current)
+		return;
+	if (last_task_used_math != NULL)
+		/* Other processes fpu state, save away */
+		save_fpu(last_task_used_math);
+	last_task_used_math = current;
+#endif
+	if (used_math()) {
+		load_fpu(&current->thread.fpu);
+	} else {
+		/* First time FPU user.  */
+		load_fpu(&init_fpuregs);
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+		current->thread.fpu.UDF_trap = init_fpuregs.UDF_trap;
+#endif
+		set_used_math();
+	}
+
+}
+
+inline void fill_sigfpe_signo(unsigned int fpcsr, int *signo)
+{
+	if (fpcsr & FPCSR_mskOVFT)
+		*signo = FPE_FLTOVF;
+#ifndef CONFIG_SUPPORT_DENORMAL_ARITHMETIC
+	else if (fpcsr & FPCSR_mskUDFT)
+		*signo = FPE_FLTUND;
+#endif
+	else if (fpcsr & FPCSR_mskIVOT)
+		*signo = FPE_FLTINV;
+	else if (fpcsr & FPCSR_mskDBZT)
+		*signo = FPE_FLTDIV;
+	else if (fpcsr & FPCSR_mskIEXT)
+		*signo = FPE_FLTRES;
+}
+
+inline void handle_fpu_exception(struct pt_regs *regs)
+{
+	unsigned int fpcsr;
+	int si_code = 0, si_signo = SIGFPE;
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+	unsigned long redo_except = FPCSR_mskDNIT|FPCSR_mskUDFT;
+#else
+	unsigned long redo_except = FPCSR_mskDNIT;
+#endif
+
+	lose_fpu();
+	fpcsr = current->thread.fpu.fpcsr;
+
+	if (fpcsr & redo_except) {
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+		if (fpcsr & FPCSR_mskUDFT)
+			current->thread.fpu.fpcsr &= ~FPCSR_mskIEX;
+#endif
+		si_signo = do_fpuemu(regs, &current->thread.fpu);
+		fpcsr = current->thread.fpu.fpcsr;
+		if (!si_signo)
+			goto done;
+	} else if (fpcsr & FPCSR_mskRIT) {
+		if (!user_mode(regs))
+			do_exit(SIGILL);
+		si_signo = SIGILL;
+	}
+
+
+	switch (si_signo) {
+	case SIGFPE:
+		fill_sigfpe_signo(fpcsr, &si_code);
+		break;
+	case SIGILL:
+		show_regs(regs);
+		si_code = ILL_COPROC;
+		break;
+	case SIGBUS:
+		si_code = BUS_ADRERR;
+		break;
+	default:
+		break;
+	}
+
+	force_sig_fault(si_signo, si_code,
+			(void __user *)instruction_pointer(regs), current);
+done:
+	own_fpu();
+}
+
+bool do_fpu_exception(unsigned int subtype, struct pt_regs *regs)
+{
+	int done = true;
+	/* Coprocessor disabled exception */
+	if (subtype == FPU_DISABLE_EXCEPTION) {
+		preempt_disable();
+		do_fpu_context_switch(regs);
+		preempt_enable();
+	}
+	/* Coprocessor exception such as underflow and overflow */
+	else if (subtype == FPU_EXCEPTION)
+		handle_fpu_exception(regs);
+	else
+		done = false;
+	return done;
+}

arch/nds32/kernel/head.S

@@ -123,21 +123,12 @@ _image_size_check:
         andi    $r0, $r0, MMU_CFG_mskTBS
         srli    $r6, $r6, MMU_CFG_offTBW
         srli    $r0, $r0, MMU_CFG_offTBS
-        /*
-         * we just map the kernel to the maximum way - 1 of tlb
-         * reserver one way for UART VA mapping
-         * it will cause page fault if UART mapping cover the kernel mapping
-         *
-         * direct mapping is not supported now.
-         */
-        li      $r2, 't'
-        beqz    $r6, __error                 ! MMU_CFG.TBW = 0 is direct mappin
+	addi    $r6, $r6, #0x1               ! MMU_CFG.TBW value -> meaning
         addi    $r0, $r0, #0x2               ! MMU_CFG.TBS value -> meaning
         sll     $r0, $r6, $r0                ! entries = k-way * n-set
         mul     $r6, $r0, $r5                ! max size = entries * page size
         /* check kernel image size */
         la      $r3, (_end - PAGE_OFFSET)
-        li      $r2, 's'
         bgt     $r3, $r6, __error
 
 	li      $r2, #(PHYS_OFFSET + TLB_DATA_kernel_text_attr)
@@ -160,7 +151,7 @@ _tlb:
 #endif
 	mtsr    $r3, $TLB_MISC
 
-	mfsr    $r0, $MISC_CTL      ! Enable BTB and RTP and shadow sp
+	mfsr    $r0, $MISC_CTL      ! Enable BTB, RTP, shadow sp, and HW_PRE
 	ori     $r0, $r0, #MISC_init
 	mtsr    $r0, $MISC_CTL
 

arch/nds32/kernel/pm.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2008-2017 Andes Technology Corporation
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/device.h>
+#include <linux/printk.h>
+#include <asm/suspend.h>
+#include <nds32_intrinsic.h>
+
+unsigned int resume_addr;
+unsigned int *phy_addr_sp_tmp;
+
+static void nds32_suspend2ram(void)
+{
+	pgd_t *pgdv;
+	pud_t *pudv;
+	pmd_t *pmdv;
+	pte_t *ptev;
+
+	pgdv = (pgd_t *)__va((__nds32__mfsr(NDS32_SR_L1_PPTB) &
+		L1_PPTB_mskBASE)) + pgd_index((unsigned int)cpu_resume);
+
+	pudv = pud_offset(pgdv, (unsigned int)cpu_resume);
+	pmdv = pmd_offset(pudv, (unsigned int)cpu_resume);
+	ptev = pte_offset_map(pmdv, (unsigned int)cpu_resume);
+
+	resume_addr = ((*ptev) & TLB_DATA_mskPPN)
+			| ((unsigned int)cpu_resume & 0x00000fff);
+
+	suspend2ram();
+}
+
+static void nds32_suspend_cpu(void)
+{
+	while (!(__nds32__mfsr(NDS32_SR_INT_PEND) & wake_mask))
+		__asm__ volatile ("standby no_wake_grant\n\t");
+}
+
+static int nds32_pm_valid(suspend_state_t state)
+{
+	switch (state) {
+	case PM_SUSPEND_ON:
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static int nds32_pm_enter(suspend_state_t state)
+{
+	pr_debug("%s:state:%d\n", __func__, state);
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+		nds32_suspend_cpu();
+		return 0;
+	case PM_SUSPEND_MEM:
+		nds32_suspend2ram();
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct platform_suspend_ops nds32_pm_ops = {
+	.valid = nds32_pm_valid,
+	.enter = nds32_pm_enter,
+};
+
+static int __init nds32_pm_init(void)
+{
+	pr_debug("Enter %s\n", __func__);
+	suspend_set_ops(&nds32_pm_ops);
+	return 0;
+}
+late_initcall(nds32_pm_init);

arch/nds32/kernel/process.c

@@ -9,15 +9,16 @@
 #include <linux/uaccess.h>
 #include <asm/elf.h>
 #include <asm/proc-fns.h>
+#include <asm/fpu.h>
 #include <linux/ptrace.h>
 #include <linux/reboot.h>
 
-extern void setup_mm_for_reboot(char mode);
-#ifdef CONFIG_PROC_FS
-struct proc_dir_entry *proc_dir_cpu;
-EXPORT_SYMBOL(proc_dir_cpu);
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+struct task_struct *last_task_used_math;
 #endif
 
+extern void setup_mm_for_reboot(char mode);
+
 extern inline void arch_reset(char mode)
 {
 	if (mode == 's') {
@@ -125,15 +126,31 @@ void show_regs(struct pt_regs *regs)
 
 EXPORT_SYMBOL(show_regs);
 
+void exit_thread(struct task_struct *tsk)
+{
+#if defined(CONFIG_FPU) && defined(CONFIG_LAZY_FPU)
+	if (last_task_used_math == tsk)
+		last_task_used_math = NULL;
+#endif
+}
+
 void flush_thread(void)
 {
+#if defined(CONFIG_FPU)
+	clear_fpu(task_pt_regs(current));
+	clear_used_math();
+# ifdef CONFIG_LAZY_FPU
+	if (last_task_used_math == current)
+		last_task_used_math = NULL;
+# endif
+#endif
 }
 
 DEFINE_PER_CPU(struct task_struct *, __entry_task);
 
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 int copy_thread(unsigned long clone_flags, unsigned long stack_start,
-	    unsigned long stk_sz, struct task_struct *p)
+		unsigned long stk_sz, struct task_struct *p)
 {
 	struct pt_regs *childregs = task_pt_regs(p);
 
@@ -159,6 +176,22 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start,
 	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
 	p->thread.cpu_context.sp = (unsigned long)childregs;
 
+#if IS_ENABLED(CONFIG_FPU)
+	if (used_math()) {
+# if !IS_ENABLED(CONFIG_LAZY_FPU)
+		unlazy_fpu(current);
+# else
+		preempt_disable();
+		if (last_task_used_math == current)
+			save_fpu(current);
+		preempt_enable();
+# endif
+		p->thread.fpu = current->thread.fpu;
+		clear_fpu(task_pt_regs(p));
+		set_stopped_child_used_math(p);
+	}
+#endif
+
 #ifdef CONFIG_HWZOL
 	childregs->lb = 0;
 	childregs->le = 0;
@@ -168,12 +201,33 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start,
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_FPU)
+struct task_struct *_switch_fpu(struct task_struct *prev, struct task_struct *next)
+{
+#if !IS_ENABLED(CONFIG_LAZY_FPU)
+	unlazy_fpu(prev);
+#endif
+	if (!(next->flags & PF_KTHREAD))
+		clear_fpu(task_pt_regs(next));
+	return prev;
+}
+#endif
+
 /*
  * fill in the fpe structure for a core dump...
  */
 int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
 {
 	int fpvalid = 0;
+#if IS_ENABLED(CONFIG_FPU)
+	struct task_struct *tsk = current;
+
+	fpvalid = tsk_used_math(tsk);
+	if (fpvalid) {
+		lose_fpu();
+		memcpy(fpu, &tsk->thread.fpu, sizeof(*fpu));
+	}
+#endif
 	return fpvalid;
 }
 

arch/nds32/kernel/setup.c

@@ -15,6 +15,7 @@
 #include <asm/proc-fns.h>
 #include <asm/cache_info.h>
 #include <asm/elf.h>
+#include <asm/fpu.h>
 #include <nds32_intrinsic.h>
 
 #define HWCAP_MFUSR_PC		0x000001
@@ -38,8 +39,10 @@
 #define HWCAP_FPU_DP		0x040000
 #define HWCAP_V2		0x080000
 #define HWCAP_DX_REGS		0x100000
+#define HWCAP_HWPRE		0x200000
 
 unsigned long cpu_id, cpu_rev, cpu_cfgid;
+bool has_fpu = false;
 char cpu_series;
 char *endianness = NULL;
 
@@ -70,8 +73,10 @@ static const char *hwcap_str[] = {
 	"div",
 	"mac",
 	"l2c",
-	"dx_regs",
+	"fpu_dp",
 	"v2",
+	"dx_regs",
+	"hw_pre",
 	NULL,
 };
 
@@ -136,6 +141,11 @@ static void __init dump_cpu_info(int cpu)
 		    (aliasing_num - 1) << PAGE_SHIFT;
 	}
 #endif
+#ifdef CONFIG_FPU
+	/* Disable fpu and enable when it is used. */
+	if (has_fpu)
+		disable_fpu();
+#endif
 }
 
 static void __init setup_cpuinfo(void)
@@ -180,9 +190,10 @@ static void __init setup_cpuinfo(void)
 	if (cpu_cfgid & 0x0004)
 		elf_hwcap |= HWCAP_EXT2;
 
-	if (cpu_cfgid & 0x0008)
+	if (cpu_cfgid & 0x0008) {
 		elf_hwcap |= HWCAP_FPU;
-
+		has_fpu = true;
+	}
 	if (cpu_cfgid & 0x0010)
 		elf_hwcap |= HWCAP_STRING;
 
@@ -212,6 +223,11 @@ static void __init setup_cpuinfo(void)
 	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)
 		elf_hwcap |= HWCAP_L2C;
 
+#ifdef CONFIG_HW_PRE
+	if (__nds32__mfsr(NDS32_SR_MISC_CTL) & MISC_CTL_makHWPRE_EN)
+		elf_hwcap |= HWCAP_HWPRE;
+#endif
+
 	tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
 	if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE))
 		tmp |= CACHE_CTL_mskDC_EN;

arch/nds32/kernel/signal.c

@@ -12,6 +12,7 @@
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
 #include <asm/unistd.h>
+#include <asm/fpu.h>
 
 #include <asm/ptrace.h>
 #include <asm/vdso.h>
@@ -20,6 +21,60 @@ struct rt_sigframe {
 	struct siginfo info;
 	struct ucontext uc;
 };
+#if IS_ENABLED(CONFIG_FPU)
+static inline int restore_sigcontext_fpu(struct pt_regs *regs,
+					 struct sigcontext __user *sc)
+{
+	struct task_struct *tsk = current;
+	unsigned long used_math_flag;
+	int ret = 0;
+
+	clear_used_math();
+	__get_user_error(used_math_flag, &sc->used_math_flag, ret);
+
+	if (!used_math_flag)
+		return 0;
+	set_used_math();
+
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+	preempt_disable();
+	if (current == last_task_used_math) {
+		last_task_used_math = NULL;
+		disable_ptreg_fpu(regs);
+	}
+	preempt_enable();
+#else
+	clear_fpu(regs);
+#endif
+
+	return __copy_from_user(&tsk->thread.fpu, &sc->fpu,
+				sizeof(struct fpu_struct));
+}
+
+static inline int setup_sigcontext_fpu(struct pt_regs *regs,
+				       struct sigcontext __user *sc)
+{
+	struct task_struct *tsk = current;
+	int ret = 0;
+
+	__put_user_error(used_math(), &sc->used_math_flag, ret);
+
+	if (!used_math())
+		return ret;
+
+	preempt_disable();
+#if IS_ENABLED(CONFIG_LAZY_FPU)
+	if (last_task_used_math == tsk)
+		save_fpu(last_task_used_math);
+#else
+	unlazy_fpu(tsk);
+#endif
+	ret = __copy_to_user(&sc->fpu, &tsk->thread.fpu,
+			     sizeof(struct fpu_struct));
+	preempt_enable();
+	return ret;
+}
+#endif
 
 static int restore_sigframe(struct pt_regs *regs,
 			    struct rt_sigframe __user * sf)
@@ -69,7 +124,9 @@ static int restore_sigframe(struct pt_regs *regs,
 	__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
 	__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
 #endif
-
+#if IS_ENABLED(CONFIG_FPU)
+	err |= restore_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
+#endif
 	/*
 	 * Avoid sys_rt_sigreturn() restarting.
 	 */
@@ -153,6 +210,9 @@ setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs,
 	__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
 	__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
 #endif
+#if IS_ENABLED(CONFIG_FPU)
+	err |= setup_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
+#endif
 
 	__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no,
 			 err);

arch/nds32/kernel/sleep.S

+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2017 Andes Technology Corporation */
+
+#include <asm/memory.h>
+
+.data
+.global sp_tmp
+sp_tmp:
+.long
+
+.text
+.globl suspend2ram
+.globl cpu_resume
+
+suspend2ram:
+	pushm   $r0, $r31
+#if defined(CONFIG_HWZOL)
+	mfusr   $r0, $lc
+	mfusr   $r1, $le
+	mfusr   $r2, $lb
+#endif
+	mfsr	$r3, $mr0
+	mfsr    $r4, $mr1
+	mfsr    $r5, $mr4
+	mfsr    $r6, $mr6
+	mfsr    $r7, $mr7
+	mfsr    $r8, $mr8
+	mfsr    $r9, $ir0
+	mfsr    $r10, $ir1
+	mfsr    $r11, $ir2
+	mfsr    $r12, $ir3
+	mfsr    $r13, $ir9
+	mfsr    $r14, $ir10
+	mfsr    $r15, $ir12
+	mfsr    $r16, $ir13
+	mfsr    $r17, $ir14
+	mfsr    $r18, $ir15
+	pushm   $r0, $r19
+#if defined(CONFIG_FPU)
+	jal	store_fpu_for_suspend
+#endif
+	tlbop	FlushAll
+	isb
+
+	// transfer $sp from va to pa
+	sethi	$r0, hi20(PAGE_OFFSET)
+	ori	$r0, $r0, lo12(PAGE_OFFSET)
+	movi	$r2, PHYS_OFFSET
+	sub	$r1, $sp, $r0
+	add	$r2, $r1, $r2
+
+	// store pa($sp) to sp_tmp
+	sethi 	$r1, hi20(sp_tmp)
+	swi	$r2, [$r1 + lo12(sp_tmp)]
+
+	pushm	$r16, $r25
+	pushm	$r29, $r30
+#ifdef	CONFIG_CACHE_L2
+	jal	dcache_wb_all_level
+#else
+	jal	cpu_dcache_wb_all
+#endif
+	popm	$r29, $r30
+	popm	$r16, $r25
+
+	// get wake_mask and loop in standby
+	la	$r1, wake_mask
+	lwi	$r1, [$r1]
+self_loop:
+	standby wake_grant
+	mfsr	$r2, $ir15
+	and	$r2, $r1, $r2
+	beqz	$r2, self_loop
+
+	// set ipc to resume address
+	la	$r1, resume_addr
+	lwi	$r1, [$r1]
+	mtsr	$r1, $ipc
+	isb
+
+	// reset psw, turn off the address translation
+	li      $r2, 0x7000a
+	mtsr    $r2, $ipsw
+	isb
+
+	iret
+cpu_resume:
+	// translate the address of sp_tmp variable to pa
+	la	$r1, sp_tmp
+	sethi   $r0, hi20(PAGE_OFFSET)
+	ori     $r0, $r0, lo12(PAGE_OFFSET)
+	movi    $r2, PHYS_OFFSET
+	sub     $r1, $r1, $r0
+	add     $r1, $r1, $r2
+
+	// access the sp_tmp to get stack pointer
+	lwi	$sp, [$r1]
+
+	popm	$r0, $r19
+#if defined(CONFIG_HWZOL)
+	mtusr   $r0, $lb
+	mtusr   $r1, $lc
+	mtusr   $r2, $le
+#endif
+	mtsr	$r3, $mr0
+	mtsr    $r4, $mr1
+	mtsr    $r5, $mr4
+	mtsr    $r6, $mr6
+	mtsr    $r7, $mr7
+	mtsr    $r8, $mr8
+	// set original psw to ipsw
+	mtsr    $r9, $ir1
+
+	mtsr    $r11, $ir2
+	mtsr    $r12, $ir3
+
+	// set ipc to RR
+	la	$r13, RR
+	mtsr	$r13, $ir9
+
+	mtsr    $r14, $ir10
+	mtsr    $r15, $ir12
+	mtsr    $r16, $ir13
+	mtsr    $r17, $ir14
+	mtsr    $r18, $ir15
+	popm    $r0, $r31
+
+	isb
+	iret
+RR:
+	ret

arch/nds32/kernel/sys_nds32.c

@@ -6,6 +6,8 @@
 
 #include <asm/cachectl.h>
 #include <asm/proc-fns.h>
+#include <asm/udftrap.h>
+#include <asm/fpu.h>
 
 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
 	       unsigned long, prot, unsigned long, flags,
@@ -48,3 +50,33 @@ SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache)
 
 	return 0;
 }
+
+SYSCALL_DEFINE1(udftrap, int, option)
+{
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+	int old_udftrap;
+
+	if (!used_math()) {
+		load_fpu(&init_fpuregs);
+		current->thread.fpu.UDF_trap = init_fpuregs.UDF_trap;
+		set_used_math();
+	}
+
+	old_udftrap = current->thread.fpu.UDF_trap;
+	switch (option) {
+	case DISABLE_UDFTRAP:
+		current->thread.fpu.UDF_trap = 0;
+		break;
+	case ENABLE_UDFTRAP:
+		current->thread.fpu.UDF_trap = FPCSR_mskUDFE;
+		break;
+	case GET_UDFTRAP:
+		break;
+	default:
+		return -EINVAL;
+	}
+	return old_udftrap;
+#else
+	return -ENOTSUPP;
+#endif
+}

arch/nds32/kernel/traps.c

@@ -12,6 +12,7 @@
 
 #include <asm/proc-fns.h>
 #include <asm/unistd.h>
+#include <asm/fpu.h>
 
 #include <linux/ptrace.h>
 #include <nds32_intrinsic.h>
@@ -357,6 +358,21 @@ void do_dispatch_general(unsigned long entry, unsigned long addr,
 	} else if (type == ETYPE_RESERVED_INSTRUCTION) {
 		/* Reserved instruction */
 		do_revinsn(regs);
+	} else if (type == ETYPE_COPROCESSOR) {
+		/* Coprocessor */
+#if IS_ENABLED(CONFIG_FPU)
+		unsigned int fucop_exist = __nds32__mfsr(NDS32_SR_FUCOP_EXIST);
+		unsigned int cpid = ((itype & ITYPE_mskCPID) >> ITYPE_offCPID);
+
+		if ((cpid == FPU_CPID) &&
+		    (fucop_exist & FUCOP_EXIST_mskCP0ISFPU)) {
+			unsigned int subtype = (itype & ITYPE_mskSTYPE);
+
+			if (true == do_fpu_exception(subtype, regs))
+				return;
+		}
+#endif
+		unhandled_exceptions(entry, addr, type, regs);
 	} else if (type == ETYPE_TRAP && swid == SWID_RAISE_INTERRUPT_LEVEL) {
 		/* trap, used on v3 EDM target debugging workaround */
 		/*

arch/nds32/math-emu/Makefile

+#
+# Makefile for the Linux/nds32 kernel FPU emulation.
+#
+
+obj-y	:= fpuemu.o \
+	   fdivd.o fmuld.o fsubd.o faddd.o fs2d.o fsqrtd.o fcmpd.o fnegs.o \
+	   fdivs.o fmuls.o fsubs.o fadds.o fd2s.o fsqrts.o fcmps.o fnegd.o

arch/nds32/math-emu/faddd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void faddd(void *ft, void *fa, void *fb)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+	FP_UNPACK_DP(B, fb);
+
+	FP_ADD_D(R, A, B);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+
+}

arch/nds32/math-emu/fadds.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fadds(void *ft, void *fa, void *fb)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(B);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+	FP_UNPACK_SP(B, fb);
+
+	FP_ADD_S(R, A, B);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+
+}

arch/nds32/math-emu/fcmpd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+int fcmpd(void *ft, void *fa, void *fb, int cmpop)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_EX;
+	long cmp;
+
+	FP_UNPACK_DP(A, fa);
+	FP_UNPACK_DP(B, fb);
+
+	FP_CMP_D(cmp, A, B, SF_CUN);
+	cmp += 2;
+	if (cmp == SF_CGT)
+		*(long *)ft = 0;
+	else
+		*(long *)ft = (cmp & cmpop) ? 1 : 0;
+
+	return 0;
+}

arch/nds32/math-emu/fcmps.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+int fcmps(void *ft, void *fa, void *fb, int cmpop)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(B);
+	FP_DECL_EX;
+	long cmp;
+
+	FP_UNPACK_SP(A, fa);
+	FP_UNPACK_SP(B, fb);
+
+	FP_CMP_S(cmp, A, B, SF_CUN);
+	cmp += 2;
+	if (cmp == SF_CGT)
+		*(int *)ft = 0x0;
+	else
+		*(int *)ft = (cmp & cmpop) ? 0x1 : 0x0;
+
+	return 0;
+}

arch/nds32/math-emu/fd2s.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/double.h>
+#include <math-emu/single.h>
+#include <math-emu/soft-fp.h>
+void fd2s(void *ft, void *fa)
+{
+	FP_DECL_D(A);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+
+	FP_CONV(S, D, 1, 2, R, A);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fdivd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+
+void fdivd(void *ft, void *fa, void *fb)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+	FP_UNPACK_DP(B, fb);
+
+	if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO)
+		FP_SET_EXCEPTION(FP_EX_DIVZERO);
+
+	FP_DIV_D(R, A, B);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fdivs.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fdivs(void *ft, void *fa, void *fb)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(B);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+	FP_UNPACK_SP(B, fb);
+
+	if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO)
+		FP_SET_EXCEPTION(FP_EX_DIVZERO);
+
+	FP_DIV_S(R, A, B);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fmuld.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fmuld(void *ft, void *fa, void *fb)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+	FP_UNPACK_DP(B, fb);
+
+	FP_MUL_D(R, A, B);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fmuls.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fmuls(void *ft, void *fa, void *fb)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(B);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+	FP_UNPACK_SP(B, fb);
+
+	FP_MUL_S(R, A, B);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fnegd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fnegd(void *ft, void *fa)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+
+	FP_NEG_D(R, A);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fnegs.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fnegs(void *ft, void *fa)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+
+	FP_NEG_S(R, A);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fpuemu.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <asm/bitfield.h>
+#include <asm/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <asm/fpuemu.h>
+#include <asm/nds32_fpu_inst.h>
+
+#define DPFROMREG(dp, x) (dp = (void *)((unsigned long *)fpu_reg + 2*x))
+#ifdef __NDS32_EL__
+#define SPFROMREG(sp, x)\
+	((sp) = (void *)((unsigned long *)fpu_reg + (x^1)))
+#else
+#define SPFROMREG(sp, x) ((sp) = (void *)((unsigned long *)fpu_reg + x))
+#endif
+
+#define DEF3OP(name, p, f1, f2) \
+void fpemu_##name##p(void *ft, void *fa, void *fb) \
+{ \
+	f1(fa, fa, fb); \
+	f2(ft, ft, fa); \
+}
+
+#define DEF3OPNEG(name, p, f1, f2, f3) \
+void fpemu_##name##p(void *ft, void *fa, void *fb) \
+{ \
+	f1(fa, fa, fb); \
+	f2(ft, ft, fa); \
+	f3(ft, ft); \
+}
+DEF3OP(fmadd, s, fmuls, fadds);
+DEF3OP(fmsub, s, fmuls, fsubs);
+DEF3OP(fmadd, d, fmuld, faddd);
+DEF3OP(fmsub, d, fmuld, fsubd);
+DEF3OPNEG(fnmadd, s, fmuls, fadds, fnegs);
+DEF3OPNEG(fnmsub, s, fmuls, fsubs, fnegs);
+DEF3OPNEG(fnmadd, d, fmuld, faddd, fnegd);
+DEF3OPNEG(fnmsub, d, fmuld, fsubd, fnegd);
+
+static const unsigned char cmptab[8] = {
+	SF_CEQ,
+	SF_CEQ,
+	SF_CLT,
+	SF_CLT,
+	SF_CLT | SF_CEQ,
+	SF_CLT | SF_CEQ,
+	SF_CUN,
+	SF_CUN
+};
+
+enum ARGTYPE {
+	S1S = 1,
+	S2S,
+	S1D,
+	CS,
+	D1D,
+	D2D,
+	D1S,
+	CD
+};
+union func_t {
+	void (*t)(void *ft, void *fa, void *fb);
+	void (*b)(void *ft, void *fa);
+};
+/*
+ * Emulate a single FPU arithmetic instruction.
+ */
+static int fpu_emu(struct fpu_struct *fpu_reg, unsigned long insn)
+{
+	int rfmt;		/* resulting format */
+	union func_t func;
+	int ftype = 0;
+
+	switch (rfmt = NDS32Insn_OPCODE_COP0(insn)) {
+	case fs1_op:{
+			switch (NDS32Insn_OPCODE_BIT69(insn)) {
+			case fadds_op:
+				func.t = fadds;
+				ftype = S2S;
+				break;
+			case fsubs_op:
+				func.t = fsubs;
+				ftype = S2S;
+				break;
+			case fmadds_op:
+				func.t = fpemu_fmadds;
+				ftype = S2S;
+				break;
+			case fmsubs_op:
+				func.t = fpemu_fmsubs;
+				ftype = S2S;
+				break;
+			case fnmadds_op:
+				func.t = fpemu_fnmadds;
+				ftype = S2S;
+				break;
+			case fnmsubs_op:
+				func.t = fpemu_fnmsubs;
+				ftype = S2S;
+				break;
+			case fmuls_op:
+				func.t = fmuls;
+				ftype = S2S;
+				break;
+			case fdivs_op:
+				func.t = fdivs;
+				ftype = S2S;
+				break;
+			case fs1_f2op_op:
+				switch (NDS32Insn_OPCODE_BIT1014(insn)) {
+				case fs2d_op:
+					func.b = fs2d;
+					ftype = S1D;
+					break;
+				case fsqrts_op:
+					func.b = fsqrts;
+					ftype = S1S;
+					break;
+				default:
+					return SIGILL;
+				}
+				break;
+			default:
+				return SIGILL;
+			}
+			break;
+		}
+	case fs2_op:
+		switch (NDS32Insn_OPCODE_BIT69(insn)) {
+		case fcmpeqs_op:
+		case fcmpeqs_e_op:
+		case fcmplts_op:
+		case fcmplts_e_op:
+		case fcmples_op:
+		case fcmples_e_op:
+		case fcmpuns_op:
+		case fcmpuns_e_op:
+			ftype = CS;
+			break;
+		default:
+			return SIGILL;
+		}
+		break;
+	case fd1_op:{
+			switch (NDS32Insn_OPCODE_BIT69(insn)) {
+			case faddd_op:
+				func.t = faddd;
+				ftype = D2D;
+				break;
+			case fsubd_op:
+				func.t = fsubd;
+				ftype = D2D;
+				break;
+			case fmaddd_op:
+				func.t = fpemu_fmaddd;
+				ftype = D2D;
+				break;
+			case fmsubd_op:
+				func.t = fpemu_fmsubd;
+				ftype = D2D;
+				break;
+			case fnmaddd_op:
+				func.t = fpemu_fnmaddd;
+				ftype = D2D;
+				break;
+			case fnmsubd_op:
+				func.t = fpemu_fnmsubd;
+				ftype = D2D;
+				break;
+			case fmuld_op:
+				func.t = fmuld;
+				ftype = D2D;
+				break;
+			case fdivd_op:
+				func.t = fdivd;
+				ftype = D2D;
+				break;
+			case fd1_f2op_op:
+				switch (NDS32Insn_OPCODE_BIT1014(insn)) {
+				case fd2s_op:
+					func.b = fd2s;
+					ftype = D1S;
+					break;
+				case fsqrtd_op:
+					func.b = fsqrtd;
+					ftype = D1D;
+					break;
+				default:
+					return SIGILL;
+				}
+				break;
+			default:
+				return SIGILL;
+
+			}
+			break;
+		}
+
+	case fd2_op:
+		switch (NDS32Insn_OPCODE_BIT69(insn)) {
+		case fcmpeqd_op:
+		case fcmpeqd_e_op:
+		case fcmpltd_op:
+		case fcmpltd_e_op:
+		case fcmpled_op:
+		case fcmpled_e_op:
+		case fcmpund_op:
+		case fcmpund_e_op:
+			ftype = CD;
+			break;
+		default:
+			return SIGILL;
+		}
+		break;
+
+	default:
+		return SIGILL;
+	}
+
+	switch (ftype) {
+	case S1S:{
+			void *ft, *fa;
+
+			SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			func.b(ft, fa);
+			break;
+		}
+	case S2S:{
+			void *ft, *fa, *fb;
+
+			SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			SPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+			func.t(ft, fa, fb);
+			break;
+		}
+	case S1D:{
+			void *ft, *fa;
+
+			DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			func.b(ft, fa);
+			break;
+		}
+	case CS:{
+			unsigned int cmpop = NDS32Insn_OPCODE_BIT69(insn);
+			void *ft, *fa, *fb;
+
+			SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			SPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			SPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+			if (cmpop < 0x8) {
+				cmpop = cmptab[cmpop];
+				fcmps(ft, fa, fb, cmpop);
+			} else
+				return SIGILL;
+			break;
+		}
+	case D1D:{
+			void *ft, *fa;
+
+			DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			func.b(ft, fa);
+			break;
+		}
+	case D2D:{
+			void *ft, *fa, *fb;
+
+			DPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			DPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+			func.t(ft, fa, fb);
+			break;
+		}
+	case D1S:{
+			void *ft, *fa;
+
+			SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			func.b(ft, fa);
+			break;
+		}
+	case CD:{
+			unsigned int cmpop = NDS32Insn_OPCODE_BIT69(insn);
+			void *ft, *fa, *fb;
+
+			SPFROMREG(ft, NDS32Insn_OPCODE_Rt(insn));
+			DPFROMREG(fa, NDS32Insn_OPCODE_Ra(insn));
+			DPFROMREG(fb, NDS32Insn_OPCODE_Rb(insn));
+			if (cmpop < 0x8) {
+				cmpop = cmptab[cmpop];
+				fcmpd(ft, fa, fb, cmpop);
+			} else
+				return SIGILL;
+			break;
+		}
+	default:
+		return SIGILL;
+	}
+
+	/*
+	 * If an exception is required, generate a tidy SIGFPE exception.
+	 */
+#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
+	if (((fpu_reg->fpcsr << 5) & fpu_reg->fpcsr & FPCSR_mskALLE_NO_UDFE) ||
+	    ((fpu_reg->fpcsr & FPCSR_mskUDF) && (fpu_reg->UDF_trap)))
+#else
+	if ((fpu_reg->fpcsr << 5) & fpu_reg->fpcsr & FPCSR_mskALLE)
+#endif
+		return SIGFPE;
+	return 0;
+}
+
+
+int do_fpuemu(struct pt_regs *regs, struct fpu_struct *fpu)
+{
+	unsigned long insn = 0, addr = regs->ipc;
+	unsigned long emulpc, contpc;
+	unsigned char *pc = (void *)&insn;
+	char c;
+	int i = 0, ret;
+
+	for (i = 0; i < 4; i++) {
+		if (__get_user(c, (unsigned char *)addr++))
+			return SIGBUS;
+		*pc++ = c;
+	}
+
+	insn = be32_to_cpu(insn);
+
+	emulpc = regs->ipc;
+	contpc = regs->ipc + 4;
+
+	if (NDS32Insn_OPCODE(insn) != cop0_op)
+		return SIGILL;
+	switch (NDS32Insn_OPCODE_COP0(insn)) {
+	case fs1_op:
+	case fs2_op:
+	case fd1_op:
+	case fd2_op:
+		{
+			/* a real fpu computation instruction */
+			ret = fpu_emu(fpu, insn);
+			if (!ret)
+				regs->ipc = contpc;
+		}
+		break;
+
+	default:
+		return SIGILL;
+	}
+
+	return ret;
+}

arch/nds32/math-emu/fs2d.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/double.h>
+#include <math-emu/single.h>
+#include <math-emu/soft-fp.h>
+
+void fs2d(void *ft, void *fa)
+{
+	FP_DECL_S(A);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+
+	FP_CONV(D, S, 2, 1, R, A);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fsqrtd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fsqrtd(void *ft, void *fa)
+{
+	FP_DECL_D(A);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+
+	FP_SQRT_D(R, A);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fsqrts.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+
+#include <linux/uaccess.h>
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fsqrts(void *ft, void *fa)
+{
+	FP_DECL_S(A);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+
+	FP_SQRT_S(R, A);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fsubd.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+void fsubd(void *ft, void *fa, void *fb)
+{
+
+	FP_DECL_D(A);
+	FP_DECL_D(B);
+	FP_DECL_D(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_DP(A, fa);
+	FP_UNPACK_DP(B, fb);
+
+	if (B_c != FP_CLS_NAN)
+		B_s ^= 1;
+
+	FP_ADD_D(R, A, B);
+
+	FP_PACK_DP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/math-emu/fsubs.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2018 Andes Technology Corporation
+#include <linux/uaccess.h>
+
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/single.h>
+void fsubs(void *ft, void *fa, void *fb)
+{
+
+	FP_DECL_S(A);
+	FP_DECL_S(B);
+	FP_DECL_S(R);
+	FP_DECL_EX;
+
+	FP_UNPACK_SP(A, fa);
+	FP_UNPACK_SP(B, fb);
+
+	if (B_c != FP_CLS_NAN)
+		B_s ^= 1;
+
+	FP_ADD_S(R, A, B);
+
+	FP_PACK_SP(ft, R);
+
+	__FPU_FPCSR |= FP_CUR_EXCEPTIONS;
+}

arch/nds32/mm/Makefile

@@ -4,4 +4,8 @@ obj-y				:= extable.o tlb.o \
 
 obj-$(CONFIG_ALIGNMENT_TRAP)	+= alignment.o
 obj-$(CONFIG_HIGHMEM)           += highmem.o
-CFLAGS_proc-n13.o		+= -fomit-frame-pointer
+
+ifdef CONFIG_FUNCTION_TRACER
+CFLAGS_REMOVE_proc.o     = $(CC_FLAGS_FTRACE)
+endif
+CFLAGS_proc.o              += -fomit-frame-pointer

arch/nds32/mm/fault.c

@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/hardirq.h>
 #include <linux/uaccess.h>
+#include <linux/perf_event.h>
 
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
@@ -169,8 +170,6 @@ void do_page_fault(unsigned long entry, unsigned long addr,
 			mask = VM_EXEC;
 		else {
 			mask = VM_READ | VM_WRITE;
-			if (vma->vm_flags & VM_WRITE)
-				flags |= FAULT_FLAG_WRITE;
 		}
 	} else if (entry == ENTRY_TLB_MISC) {
 		switch (error_code & ITYPE_mskETYPE) {
@@ -231,11 +230,17 @@ void do_page_fault(unsigned long entry, unsigned long addr,
 	 * attempt. If we go through a retry, it is extremely likely that the
 	 * page will be found in page cache at that point.
 	 */
+	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
 	if (flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_MAJOR)
+		if (fault & VM_FAULT_MAJOR) {
 			tsk->maj_flt++;
-		else
+			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
+				      1, regs, addr);
+		} else {
 			tsk->min_flt++;
+			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
+				      1, regs, addr);
+		}
 		if (fault & VM_FAULT_RETRY) {
 			flags &= ~FAULT_FLAG_ALLOW_RETRY;
 			flags |= FAULT_FLAG_TRIED;

drivers/irqchip/irq-ativic32.c

@@ -10,6 +10,8 @@
 #include <linux/irqchip.h>
 #include <nds32_intrinsic.h>
 
+unsigned long wake_mask;
+
 static void ativic32_ack_irq(struct irq_data *data)
 {
 	__nds32__mtsr_dsb(BIT(data->hwirq), NDS32_SR_INT_PEND2);
@@ -27,11 +29,40 @@ static void ativic32_unmask_irq(struct irq_data *data)
 	__nds32__mtsr_dsb(int_mask2 | (BIT(data->hwirq)), NDS32_SR_INT_MASK2);
 }
 
+static int nointc_set_wake(struct irq_data *data, unsigned int on)
+{
+	unsigned long int_mask = __nds32__mfsr(NDS32_SR_INT_MASK);
+	static unsigned long irq_orig_bit;
+	u32 bit = 1 << data->hwirq;
+
+	if (on) {
+		if (int_mask & bit)
+			__assign_bit(data->hwirq, &irq_orig_bit, true);
+		else
+			__assign_bit(data->hwirq, &irq_orig_bit, false);
+
+		__assign_bit(data->hwirq, &int_mask, true);
+		__assign_bit(data->hwirq, &wake_mask, true);
+
+	} else {
+		if (!(irq_orig_bit & bit))
+			__assign_bit(data->hwirq, &int_mask, false);
+
+		__assign_bit(data->hwirq, &wake_mask, false);
+		__assign_bit(data->hwirq, &irq_orig_bit, false);
+	}
+
+	__nds32__mtsr_dsb(int_mask, NDS32_SR_INT_MASK);
+
+	return 0;
+}
+
 static struct irq_chip ativic32_chip = {
 	.name = "ativic32",
 	.irq_ack = ativic32_ack_irq,
 	.irq_mask = ativic32_mask_irq,
 	.irq_unmask = ativic32_unmask_irq,
+	.irq_set_wake = nointc_set_wake,
 };
 
 static unsigned int __initdata nivic_map[6] = { 6, 2, 10, 16, 24, 32 };

include/math-emu/op-2.h

@@ -31,61 +31,56 @@
 #define _FP_FRAC_HIGH_2(X)	(X##_f1)
 #define _FP_FRAC_LOW_2(X)	(X##_f0)
 #define _FP_FRAC_WORD_2(X,w)	(X##_f##w)
+#define _FP_FRAC_SLL_2(X, N) (						       \
+	(void) (((N) < _FP_W_TYPE_SIZE)					       \
+	  ? ({								       \
+		if (__builtin_constant_p(N) && (N) == 1) {		       \
+			X##_f1 = X##_f1 + X##_f1 +			       \
+				(((_FP_WS_TYPE) (X##_f0)) < 0);		       \
+			X##_f0 += X##_f0;				       \
+		} else {						       \
+			X##_f1 = X##_f1 << (N) | X##_f0 >>		       \
+						(_FP_W_TYPE_SIZE - (N));       \
+			X##_f0 <<= (N);					       \
+		}							       \
+		0;							       \
+	    })								       \
+	  : ({								       \
+	      X##_f1 = X##_f0 << ((N) - _FP_W_TYPE_SIZE);		       \
+	      X##_f0 = 0;						       \
+	  })))
+
+
+#define _FP_FRAC_SRL_2(X, N) (						       \
+	(void) (((N) < _FP_W_TYPE_SIZE)					       \
+	  ? ({								       \
+	      X##_f0 = X##_f0 >> (N) | X##_f1 << (_FP_W_TYPE_SIZE - (N));      \
+	      X##_f1 >>= (N);						       \
+	    })								       \
+	  : ({								       \
+	      X##_f0 = X##_f1 >> ((N) - _FP_W_TYPE_SIZE);		       \
+	      X##_f1 = 0;						       \
+	    })))
 
-#define _FP_FRAC_SLL_2(X,N)						\
-  do {									\
-    if ((N) < _FP_W_TYPE_SIZE)						\
-      {									\
-	if (__builtin_constant_p(N) && (N) == 1) 			\
-	  {								\
-	    X##_f1 = X##_f1 + X##_f1 + (((_FP_WS_TYPE)(X##_f0)) < 0);	\
-	    X##_f0 += X##_f0;						\
-	  }								\
-	else								\
-	  {								\
-	    X##_f1 = X##_f1 << (N) | X##_f0 >> (_FP_W_TYPE_SIZE - (N));	\
-	    X##_f0 <<= (N);						\
-	  }								\
-      }									\
-    else								\
-      {									\
-	X##_f1 = X##_f0 << ((N) - _FP_W_TYPE_SIZE);			\
-	X##_f0 = 0;							\
-      }									\
-  } while (0)
-
-#define _FP_FRAC_SRL_2(X,N)						\
-  do {									\
-    if ((N) < _FP_W_TYPE_SIZE)						\
-      {									\
-	X##_f0 = X##_f0 >> (N) | X##_f1 << (_FP_W_TYPE_SIZE - (N));	\
-	X##_f1 >>= (N);							\
-      }									\
-    else								\
-      {									\
-	X##_f0 = X##_f1 >> ((N) - _FP_W_TYPE_SIZE);			\
-	X##_f1 = 0;							\
-      }									\
-  } while (0)
 
 /* Right shift with sticky-lsb.  */
-#define _FP_FRAC_SRS_2(X,N,sz)						\
-  do {									\
-    if ((N) < _FP_W_TYPE_SIZE)						\
-      {									\
-	X##_f0 = (X##_f1 << (_FP_W_TYPE_SIZE - (N)) | X##_f0 >> (N) |	\
-		  (__builtin_constant_p(N) && (N) == 1			\
-		   ? X##_f0 & 1						\
-		   : (X##_f0 << (_FP_W_TYPE_SIZE - (N))) != 0));	\
-	X##_f1 >>= (N);							\
-      }									\
-    else								\
-      {									\
-	X##_f0 = (X##_f1 >> ((N) - _FP_W_TYPE_SIZE) |			\
-		(((X##_f1 << (2*_FP_W_TYPE_SIZE - (N))) | X##_f0) != 0)); \
-	X##_f1 = 0;							\
-      }									\
-  } while (0)
+#define _FP_FRAC_SRS_2(X, N, sz) (					       \
+	(void) (((N) < _FP_W_TYPE_SIZE)					       \
+	  ? ({								       \
+	      X##_f0 = (X##_f1 << (_FP_W_TYPE_SIZE - (N)) | X##_f0 >> (N)      \
+			| (__builtin_constant_p(N) && (N) == 1		       \
+			   ? X##_f0 & 1					       \
+			   : (X##_f0 << (_FP_W_TYPE_SIZE - (N))) != 0));       \
+		X##_f1 >>= (N);						       \
+	    })								       \
+	  : ({								       \
+	      X##_f0 = (X##_f1 >> ((N) - _FP_W_TYPE_SIZE)		       \
+			| ((((N) == _FP_W_TYPE_SIZE			       \
+			     ? 0					       \
+			     : (X##_f1 << (2*_FP_W_TYPE_SIZE - (N))))          \
+			    | X##_f0) != 0));				       \
+	      X##_f1 = 0;						       \
+	    })))
 
 #define _FP_FRAC_ADDI_2(X,I)	\
   __FP_FRAC_ADDI_2(X##_f1, X##_f0, I)

include/math-emu/soft-fp.h

@@ -138,7 +138,7 @@ do {							\
       _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);		\
 } while (0)
 
-#define _FP_ROUND_ZERO(wc, X)		0
+#define _FP_ROUND_ZERO(wc, X)		(void)0
 
 #define _FP_ROUND_PINF(wc, X)				\
 do {							\

tools/include/asm/barrier.h

@@ -24,6 +24,8 @@
 #include "../../arch/ia64/include/asm/barrier.h"
 #elif defined(__xtensa__)
 #include "../../arch/xtensa/include/asm/barrier.h"
+#elif defined(__nds32__)
+#include "../../arch/nds32/include/asm/barrier.h"
 #else
 #include <asm-generic/barrier.h>
 #endif

tools/perf/arch/nds32/Build

+libperf-y += util/

tools/perf/arch/nds32/util/Build

+libperf-y += header.o

tools/perf/arch/nds32/util/header.c

+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <api/fs/fs.h>
+#include "header.h"
+
+#define STR_LEN 1024
+
+char *get_cpuid_str(struct perf_pmu *pmu)
+{
+	/* In nds32, we only have one cpu */
+	char *buf = NULL;
+	struct cpu_map *cpus;
+	const char *sysfs = sysfs__mountpoint();
+
+	if (!sysfs || !pmu || !pmu->cpus)
+		return NULL;
+
+	buf = malloc(STR_LEN);
+	if (!buf)
+		return NULL;
+
+	cpus = cpu_map__get(pmu->cpus);
+	sprintf(buf, "0x%x", cpus->nr - 1);
+	cpu_map__put(cpus);
+	return buf;
+}

tools/perf/pmu-events/arch/nds32/mapfile.csv

+# Format:
+#	MIDR,Version,JSON/file/pathname,Type
+#
+# where
+#	MIDR	Processor version
+#		Variant[23:20] and Revision [3:0] should be zero.
+#	Version could be used to track version of of JSON file
+#		but currently unused.
+#	JSON/file/pathname is the path to JSON file, relative
+#		to tools/perf/pmu-events/arch/arm64/.
+#	Type is core, uncore etc
+#
+#
+#Family-model,Version,Filename,EventType
+0x0,v3,n13,core

tools/perf/pmu-events/arch/nds32/n13/atcpmu.json

+[
+  {
+	"PublicDescription": "Conditional branch",
+    "EventCode": "0x102",
+    "EventName": "cond_br",
+    "BriefDescription": "V3 Conditional branch"
+  },
+  {
+	"PublicDescription": "Taken conditional branches",
+    "EventCode": "0x103",
+    "EventName": "taken_cond_br",
+    "BriefDescription": "V3 Taken Conditional branch"
+  },
+  {
+	"PublicDescription": "Prefetch Instruction",
+    "EventCode": "0x104",
+    "EventName": "prefetch_inst",
+    "BriefDescription": "V3 Prefetch Instruction"
+  },
+  {
+	"PublicDescription": "RET Inst",
+    "EventCode": "0x105",
+    "EventName": "ret_inst",
+    "BriefDescription": "V3 RET Inst"
+  },
+  {
+	"PublicDescription": "JR(non-RET) instructions",
+    "EventCode": "0x106",
+    "EventName": "jr_inst",
+    "BriefDescription": "V3 JR(non-RET) instructions"
+  },
+  {
+	"PublicDescription": "JAL/JRAL instructions",
+    "EventCode": "0x107",
+    "EventName": "jal_jral_inst",
+    "BriefDescription": "V3 JAL/JRAL instructions"
+  },
+  {
+	"PublicDescription": "NOP instructions",
+    "EventCode": "0x108",
+    "EventName": "nop_inst",
+    "BriefDescription": "V3 NOP instructions"
+  },
+  {
+	"PublicDescription": "SCW instructions",
+    "EventCode": "0x109",
+    "EventName": "scw_inst",
+    "BriefDescription": "V3 SCW instructions"
+  },
+  {
+	"PublicDescription": "ISB/DSB instructions",
+    "EventCode": "0x10a",
+    "EventName": "isb_dsb_inst",
+    "BriefDescription": "V3 ISB/DSB instructions"
+  },
+  {
+	"PublicDescription": "CCTL instructions",
+    "EventCode": "0x10b",
+    "EventName": "cctl_inst",
+    "BriefDescription": "V3 CCTL instructions"
+  },
+  {
+	"PublicDescription": "Taken Interrupts",
+    "EventCode": "0x10c",
+    "EventName": "taken_interrupts",
+    "BriefDescription": "V3 Taken Interrupts"
+  },
+  {
+	"PublicDescription": "Loads Completed",
+    "EventCode": "0x10d",
+    "EventName": "load_completed",
+    "BriefDescription": "V3 Loads Completed"
+  },
+  {
+	"PublicDescription": "uITLB accesses",
+    "EventCode": "0x10e",
+    "EventName": "uitlb_access",
+    "BriefDescription": "V3 uITLB accesses"
+  },
+  {
+	"PublicDescription": "uDTLB accesses",
+    "EventCode": "0x10f",
+    "EventName": "udtlb_access",
+    "BriefDescription": "V3 uDTLB accesses"
+  },
+  {
+	"PublicDescription": "MTLB accesses",
+    "EventCode": "0x110",
+    "EventName": "mtlb_access",
+    "BriefDescription": "V3 MTLB accesses"
+  },
+  {
+	"PublicDescription": "DATA_DEPENDENCY_STALL_CYCLES",
+    "EventCode": "0x112",
+    "EventName": "data_dependency_stall",
+    "BriefDescription": "V3 DATA_DEPENDENCY_STALL_CYCLES"
+  },
+  {
+	"PublicDescription": "DATA_CACHE_MISS_STALL_CYCLES",
+    "EventCode": "0x113",
+    "EventName": "dcache_miss_stall",
+    "BriefDescription": "V3 DATA_CACHE_MISS_STALL_CYCLES"
+  },
+  {
+	"PublicDescription": "ILM access",
+    "EventCode": "0x118",
+    "EventName": "ilm_access",
+    "BriefDescription": "V3 ILM accesses"
+  },
+  {
+	"PublicDescription": "LSU BIU CYCLES",
+    "EventCode": "0x119",
+    "EventName": "lsu_biu_cycles",
+    "BriefDescription": "V3 LSU BIU CYCLES"
+  },
+  {
+	"PublicDescription": "HPTWK BIU CYCLES",
+    "EventCode": "0x11a",
+    "EventName": "hptwk_biu_cycles",
+    "BriefDescription": "V3 HPTWK BIU CYCLES"
+  },
+  {
+	"PublicDescription": "DMA BIU CYCLES",
+    "EventCode": "0x11b",
+    "EventName": "dma_biu_cycles",
+    "BriefDescription": "V3 DMA BIU CYCLES"
+  },
+  {
+	"PublicDescription": "CODE CACHE FILL BIU CYCLES",
+    "EventCode": "0x11c",
+    "EventName": "icache_fill_biu_cycles",
+    "BriefDescription": "V3 CODE CACHE FILL BIU CYCLES"
+  },
+  {
+	"PublicDescription": "LEAGAL UNALIGN DCACHE ACCESS",
+    "EventCode": "0x11d",
+    "EventName": "legal_unalined_dcache_access",
+    "BriefDescription": "V3 LEAGAL UNALIGN DCACHE ACCESS"
+  },
+  {
+	"PublicDescription": "PUSH25 instructions",
+    "EventCode": "0x11e",
+    "EventName": "push25_inst",
+    "BriefDescription": "V3 PUSH25 instructions"
+  },
+  {
+	"PublicDescription": "SYSCALL instructions",
+    "EventCode": "0x11f",
+    "EventName": "syscall_inst",
+    "BriefDescription": "V3 SYSCALL instructions"
+  },
+  {
+	"PublicDescription": "conditional branch miss",
+    "EventCode": "0x202",
+    "EventName": "cond_br_miss",
+    "BriefDescription": "V3 conditional branch miss"
+  },
+  {
+	"PublicDescription": "taken conditional branch miss",
+    "EventCode": "0x203",
+    "EventName": "taken_cond_br_miss",
+    "BriefDescription": "V3 taken conditional branch miss"
+  },
+  {
+	"PublicDescription": "Prefetch Instructions with cache hit",
+    "EventCode": "0x204",
+    "EventName": "prefetch_icache_hit",
+    "BriefDescription": "V3 Prefetch Instructions with cache hit"
+  },
+  {
+	"PublicDescription": "RET mispredict",
+    "EventCode": "0x205",
+    "EventName": "ret_mispredict",
+    "BriefDescription": "V3 RET mispredict"
+  },
+  {
+	"PublicDescription": "Immediate J instructions",
+    "EventCode": "0x206",
+    "EventName": "imm_j_inst",
+    "BriefDescription": "V3 Immediate J instructions"
+  },
+  {
+	"PublicDescription": "Multiply instructions",
+    "EventCode": "0x207",
+    "EventName": "mul_inst",
+    "BriefDescription": "V3 Multiply instructions"
+  },
+  {
+	"PublicDescription": "16 bits instructions",
+    "EventCode": "0x208",
+    "EventName": "sixteen_bits_inst",
+    "BriefDescription": "V3 16 bits instructions"
+  },
+  {
+	"PublicDescription": "Failed SCW instructions",
+    "EventCode": "0x209",
+    "EventName": "fail_scw_inst",
+    "BriefDescription": "V3 Failed SCW instructions"
+  },
+  {
+	"PublicDescription": "ld-after-st conflict replays",
+    "EventCode": "0x20a",
+    "EventName": "ld_af_st_conflict",
+    "BriefDescription": "V3 ld-after-st conflict replays"
+  },
+  {
+	"PublicDescription": "Exception taken",
+    "EventCode": "0x20c",
+    "EventName": "exception_taken",
+    "BriefDescription": "V3 Exception taken"
+  },
+  {
+	"PublicDescription": "Stores completed",
+    "EventCode": "0x20d",
+    "EventName": "store_completed",
+    "BriefDescription": "V3 Stores completed"
+  },
+  {
+	"PublicDescription": "uITLB miss",
+    "EventCode": "0x20e",
+    "EventName": "uitlb_miss",
+    "BriefDescription": "V3 uITLB miss"
+  },
+  {
+	"PublicDescription": "uDTLB miss",
+    "EventCode": "0x20f",
+    "EventName": "udtlb_miss",
+    "BriefDescription": "V3 uDTLB miss"
+  },
+  {
+	"PublicDescription": "MTLB miss",
+    "EventCode": "0x210",
+    "EventName": "mtlb_miss",
+    "BriefDescription": "V3 MTLB miss"
+  },
+  {
+	"PublicDescription": "Empty instructions queue stall cycles",
+    "EventCode": "0x212",
+    "EventName": "empty_inst_q_stall",
+    "BriefDescription": "V3 Empty instructions queue stall cycles"
+  },
+  {
+	"PublicDescription": "Data write back",
+    "EventCode": "0x213",
+    "EventName": "data_wb",
+    "BriefDescription": "V3 Data write back"
+  },
+  {
+	"PublicDescription": "DLM access",
+    "EventCode": "0x218",
+    "EventName": "dlm_access",
+    "BriefDescription": "V3 DLM access"
+  },
+  {
+	"PublicDescription": "LSU BIU request",
+    "EventCode": "0x219",
+    "EventName": "lsu_biu_req",
+    "BriefDescription": "V3 LSU BIU request"
+  },
+  {
+	"PublicDescription": "HPTWK BIU request",
+    "EventCode": "0x21a",
+    "EventName": "hptwk_biu_req",
+    "BriefDescription": "V3 HPTWK BIU request"
+  },
+  {
+	"PublicDescription": "DMA BIU request",
+    "EventCode": "0x21b",
+    "EventName": "dma_biu_req",
+    "BriefDescription": "V3 DMA BIU request"
+  },
+  {
+	"PublicDescription": "Icache fill BIU request",
+    "EventCode": "0x21c",
+    "EventName": "icache_fill_biu_req",
+    "BriefDescription": "V3 Icache fill BIU request"
+  },
+  {
+	"PublicDescription": "External events",
+    "EventCode": "0x21d",
+    "EventName": "external_events",
+    "BriefDescription": "V3 External events"
+  },
+  {
+	"PublicDescription": "POP25 instructions",
+    "EventCode": "0x21e",
+    "EventName": "pop25_inst",
+    "BriefDescription": "V3 POP25 instructions"
+  },
+]