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linux-7.2.3/arch/mips/include/asm/vdso/clocksource.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __ASM_VDSOCLOCKSOURCE_H
+#define __ASM_VDSOCLOCKSOURCE_H
+
+#define VDSO_ARCH_CLOCKMODES	\
+	VDSO_CLOCKMODE_R4K,	\
+	VDSO_CLOCKMODE_GIC
+
+#endif /* __ASM_VDSOCLOCKSOURCE_H */

linux-7.2.3/arch/mips/include/asm/vdso/gettimeofday.h

@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2018 ARM Limited
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Alex Smith <alex.smith@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#ifndef __ASM_VDSO_GETTIMEOFDAY_H
+#define __ASM_VDSO_GETTIMEOFDAY_H
+
+#ifndef __ASSEMBLER__
+
+#include <asm/vdso/vdso.h>
+#include <asm/clocksource.h>
+#include <asm/unistd.h>
+#include <asm/vdso.h>
+
+#define VDSO_HAS_CLOCK_GETRES		1
+
+#if MIPS_ISA_REV < 6
+#define VDSO_SYSCALL_CLOBBERS "hi", "lo",
+#else
+#define VDSO_SYSCALL_CLOBBERS
+#endif
+
+static __always_inline long gettimeofday_fallback(
+				struct __kernel_old_timeval *_tv,
+				struct timezone *_tz)
+{
+	register struct timezone *tz asm("a1") = _tz;
+	register struct __kernel_old_timeval *tv asm("a0") = _tv;
+	register long ret asm("v0");
+	register long nr asm("v0") = __NR_gettimeofday;
+	register long error asm("a3");
+
+	asm volatile(
+	"       syscall\n"
+	: "=r" (ret), "=r" (error)
+	: "r" (tv), "r" (tz), "r" (nr)
+	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+	  "$14", "$15", "$24", "$25",
+	  VDSO_SYSCALL_CLOBBERS
+	  "memory");
+
+	return error ? -ret : ret;
+}
+
+static __always_inline long clock_gettime_fallback(
+					clockid_t _clkid,
+					struct __kernel_timespec *_ts)
+{
+	register struct __kernel_timespec *ts asm("a1") = _ts;
+	register clockid_t clkid asm("a0") = _clkid;
+	register long ret asm("v0");
+#if _MIPS_SIM == _MIPS_SIM_ABI64
+	register long nr asm("v0") = __NR_clock_gettime;
+#else
+	register long nr asm("v0") = __NR_clock_gettime64;
+#endif
+	register long error asm("a3");
+
+	asm volatile(
+	"       syscall\n"
+	: "=r" (ret), "=r" (error)
+	: "r" (clkid), "r" (ts), "r" (nr)
+	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+	  "$14", "$15", "$24", "$25",
+	  VDSO_SYSCALL_CLOBBERS
+	  "memory");
+
+	return error ? -ret : ret;
+}
+
+static __always_inline int clock_getres_fallback(
+					clockid_t _clkid,
+					struct __kernel_timespec *_ts)
+{
+	register struct __kernel_timespec *ts asm("a1") = _ts;
+	register clockid_t clkid asm("a0") = _clkid;
+	register long ret asm("v0");
+#if _MIPS_SIM == _MIPS_SIM_ABI64
+	register long nr asm("v0") = __NR_clock_getres;
+#else
+	register long nr asm("v0") = __NR_clock_getres_time64;
+#endif
+	register long error asm("a3");
+
+	asm volatile(
+	"       syscall\n"
+	: "=r" (ret), "=r" (error)
+	: "r" (clkid), "r" (ts), "r" (nr)
+	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+	  "$14", "$15", "$24", "$25",
+	  VDSO_SYSCALL_CLOBBERS
+	  "memory");
+
+	return error ? -ret : ret;
+}
+
+#if _MIPS_SIM != _MIPS_SIM_ABI64
+
+static __always_inline long clock_gettime32_fallback(
+					clockid_t _clkid,
+					struct old_timespec32 *_ts)
+{
+	register struct old_timespec32 *ts asm("a1") = _ts;
+	register clockid_t clkid asm("a0") = _clkid;
+	register long ret asm("v0");
+	register long nr asm("v0") = __NR_clock_gettime;
+	register long error asm("a3");
+
+	asm volatile(
+	"       syscall\n"
+	: "=r" (ret), "=r" (error)
+	: "r" (clkid), "r" (ts), "r" (nr)
+	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+	  "$14", "$15", "$24", "$25",
+	  VDSO_SYSCALL_CLOBBERS
+	  "memory");
+
+	return error ? -ret : ret;
+}
+
+static __always_inline int clock_getres32_fallback(
+					clockid_t _clkid,
+					struct old_timespec32 *_ts)
+{
+	register struct old_timespec32 *ts asm("a1") = _ts;
+	register clockid_t clkid asm("a0") = _clkid;
+	register long ret asm("v0");
+	register long nr asm("v0") = __NR_clock_getres;
+	register long error asm("a3");
+
+	asm volatile(
+	"       syscall\n"
+	: "=r" (ret), "=r" (error)
+	: "r" (clkid), "r" (ts), "r" (nr)
+	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+	  "$14", "$15", "$24", "$25",
+	  VDSO_SYSCALL_CLOBBERS
+	  "memory");
+
+	return error ? -ret : ret;
+}
+#endif
+
+#ifdef CONFIG_CSRC_R4K
+
+static __always_inline u64 read_r4k_count(void)
+{
+	unsigned int count;
+
+	__asm__ __volatile__(
+	"	.set push\n"
+	"	.set mips32r2\n"
+	"	rdhwr	%0, $2\n"
+	"	.set pop\n"
+	: "=r" (count));
+
+	return count;
+}
+
+#endif
+
+#ifdef CONFIG_CLKSRC_MIPS_GIC
+
+static __always_inline u64 read_gic_count(const struct vdso_time_data *data)
+{
+	void __iomem *gic = get_gic(data);
+	u32 hi, hi2, lo;
+
+	do {
+		hi = __raw_readl(gic + sizeof(lo));
+		lo = __raw_readl(gic);
+		hi2 = __raw_readl(gic + sizeof(lo));
+	} while (hi2 != hi);
+
+	return (((u64)hi) << 32) + lo;
+}
+
+#endif
+
+static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
+						 const struct vdso_time_data *vd)
+{
+#ifdef CONFIG_CSRC_R4K
+	if (clock_mode == VDSO_CLOCKMODE_R4K)
+		return read_r4k_count();
+#endif
+#ifdef CONFIG_CLKSRC_MIPS_GIC
+	if (clock_mode == VDSO_CLOCKMODE_GIC)
+		return read_gic_count(vd);
+#endif
+	/*
+	 * Core checks mode already. So this raced against a concurrent
+	 * update. Return something. Core will do another round see the
+	 * change and fallback to syscall.
+	 */
+	return 0;
+}
+
+static inline bool mips_vdso_hres_capable(void)
+{
+	return IS_ENABLED(CONFIG_CSRC_R4K) ||
+	       IS_ENABLED(CONFIG_CLKSRC_MIPS_GIC);
+}
+#define __arch_vdso_hres_capable mips_vdso_hres_capable
+
+static __always_inline const struct vdso_time_data *__arch_get_vdso_u_time_data(void)
+{
+	return get_vdso_time_data();
+}
+#define __arch_get_vdso_u_time_data __arch_get_vdso_u_time_data
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* __ASM_VDSO_GETTIMEOFDAY_H */

linux-7.2.3/arch/mips/include/asm/vdso/processor.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 ARM Ltd.
+ */
+#ifndef __ASM_VDSO_PROCESSOR_H
+#define __ASM_VDSO_PROCESSOR_H
+
+#ifndef __ASSEMBLER__
+
+#ifdef CONFIG_CPU_LOONGSON64
+/*
+ * Loongson-3's SFB (Store-Fill-Buffer) may buffer writes indefinitely when a
+ * tight read loop is executed, because reads take priority over writes & the
+ * hardware (incorrectly) doesn't ensure that writes will eventually occur.
+ *
+ * Since spin loops of any kind should have a cpu_relax() in them, force an SFB
+ * flush from cpu_relax() such that any pending writes will become visible as
+ * expected.
+ */
+#define cpu_relax()	smp_mb()
+#else
+#define cpu_relax()	barrier()
+#endif
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* __ASM_VDSO_PROCESSOR_H */

linux-7.2.3/arch/mips/include/asm/vdso/vdso.h

@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Alex Smith <alex.smith@imgtec.com>
+ */
+
+#ifndef __ASM_VDSO_VDSO_H
+#define __ASM_VDSO_VDSO_H
+
+#include <asm/sgidefs.h>
+#include <vdso/page.h>
+
+#define __VDSO_PAGES 4
+
+#ifndef __ASSEMBLER__
+
+#include <asm/asm.h>
+#include <asm/vdso.h>
+
+static inline const struct vdso_time_data *get_vdso_time_data(void)
+{
+	const struct vdso_time_data *addr;
+
+	/*
+	 * We can't use cpu_has_mips_r6 since it needs the cpu_data[]
+	 * kernel symbol.
+	 */
+#ifdef CONFIG_CPU_MIPSR6
+	/*
+	 * lapc <symbol> is an alias to addiupc reg, <symbol> - .
+	 *
+	 * We can't use addiupc because there is no label-label
+	 * support for the addiupc reloc
+	 */
+	__asm__("lapc	%0, vdso_u_time_data		\n"
+		: "=r" (addr) : :);
+#else
+	/*
+	 * Get the base load address of the VDSO. We have to avoid generating
+	 * relocations and references to the GOT because ld.so does not perform
+	 * relocations on the VDSO. We use the current offset from the VDSO base
+	 * and perform a PC-relative branch which gives the absolute address in
+	 * ra, and take the difference. The assembler chokes on
+	 * "li %0, _start - .", so embed the offset as a word and branch over
+	 * it.
+	 *
+	 */
+
+	__asm__(
+	"	.set push				\n"
+	"	.set noreorder				\n"
+	"	bal	1f				\n"
+	"	 nop					\n"
+	"	.word	vdso_u_time_data - .		\n"
+	"1:	lw	%0, 0($31)			\n"
+	"	" STR(PTR_ADDU) " %0, $31, %0		\n"
+	"	.set pop				\n"
+	: "=r" (addr)
+	:
+	: "$31");
+#endif /* CONFIG_CPU_MIPSR6 */
+
+	return addr;
+}
+
+#ifdef CONFIG_CLKSRC_MIPS_GIC
+
+static inline void __iomem *get_gic(const struct vdso_time_data *data)
+{
+	return (void __iomem *)((unsigned long)data & PAGE_MASK) - PAGE_SIZE;
+}
+
+#endif /* CONFIG_CLKSRC_MIPS_GIC */
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* __ASM_VDSO_VDSO_H */

linux-7.2.3/arch/mips/include/asm/vdso/vsyscall.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_VDSO_VSYSCALL_H
+#define __ASM_VDSO_VSYSCALL_H
+
+#include <asm/page.h>
+
+#ifndef __ASSEMBLER__
+
+#include <vdso/datapage.h>
+
+/* The asm-generic header needs to be included after the definitions above */
+#include <asm-generic/vdso/vsyscall.h>
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* __ASM_VDSO_VSYSCALL_H */