Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

Pull sparc updates from David Miller:

 1) Add missing cmpxchg64() for 32-bit sparc.

 2) Timer conversions from Allen Pais and Kees Cook.

 3) vDSO support, from Nagarathnam Muthusamy.

 4) Fix sparc64 huge page table walks based upon bug report by Al Viro,
    from Nitin Gupta.

 5) Optimized fls() for T4 and above, from Vijay Kumar.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Fix page table walk for PUD hugepages
  sparc64: Convert timers to user timer_setup()
  sparc64: convert mdesc_handle.refcnt from atomic_t to refcount_t
  sparc/led: Convert timers to use timer_setup()
  sparc64: Use sparc optimized fls and __fls for T4 and above
  sparc64: SPARC optimized __fls function
  sparc64: SPARC optimized fls function
  sparc64: Define SPARC default __fls function
  sparc64: Define SPARC default fls function
  vDSO for sparc
  sparc32: Add cmpxchg64().
  sbus: char: Move D7S_MINOR to include/linux/miscdevice.h
  sparc: time: Remove unneeded linux/miscdevice.h include
  sparc64: mmu_context: Add missing include files

1 files changed, 264 insertions, 0 deletions

diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
new file mode 100644
index 000000000000..3feb3d960ca5
--- /dev/null
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright 2006 Andi Kleen, SUSE Labs.
+ * Subject to the GNU Public License, v.2
+ *
+ * Fast user context implementation of clock_gettime, gettimeofday, and time.
+ *
+ * The code should have no internal unresolved relocations.
+ * Check with readelf after changing.
+ * Also alternative() doesn't work.
+ */
+/*
+ * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
+ */
+
+/* Disable profiling for userspace code: */
+#ifndef	DISABLE_BRANCH_PROFILING
+#define	DISABLE_BRANCH_PROFILING
+#endif
+
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <asm/io.h>
+#include <asm/unistd.h>
+#include <asm/timex.h>
+#include <asm/clocksource.h>
+#include <asm/vvar.h>
+
+#undef	TICK_PRIV_BIT
+#ifdef	CONFIG_SPARC64
+#define	TICK_PRIV_BIT	(1UL << 63)
+#else
+#define	TICK_PRIV_BIT	(1ULL << 63)
+#endif
+
+#define SYSCALL_STRING							\
+	"ta	0x6d;"							\
+	"sub	%%g0, %%o0, %%o0;"					\
+
+#define SYSCALL_CLOBBERS						\
+	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",			\
+	"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",		\
+	"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",		\
+	"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",		\
+	"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",		\
+	"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",		\
+	"cc", "memory"
+
+/*
+ * Compute the vvar page's address in the process address space, and return it
+ * as a pointer to the vvar_data.
+ */
+static notrace noinline struct vvar_data *
+get_vvar_data(void)
+{
+	unsigned long ret;
+
+	/*
+	 * vdso data page is the first vDSO page so grab the return address
+	 * and move up a page to get to the data page.
+	 */
+	ret = (unsigned long)__builtin_return_address(0);
+	ret &= ~(8192 - 1);
+	ret -= 8192;
+
+	return (struct vvar_data *) ret;
+}
+
+static notrace long
+vdso_fallback_gettime(long clock, struct timespec *ts)
+{
+	register long num __asm__("g1") = __NR_clock_gettime;
+	register long o0 __asm__("o0") = clock;
+	register long o1 __asm__("o1") = (long) ts;
+
+	__asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+			     "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+	return o0;
+}
+
+static notrace __always_inline long
+vdso_fallback_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+	register long num __asm__("g1") = __NR_gettimeofday;
+	register long o0 __asm__("o0") = (long) tv;
+	register long o1 __asm__("o1") = (long) tz;
+
+	__asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+			     "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+	return o0;
+}
+
+#ifdef	CONFIG_SPARC64
+static notrace noinline u64
+vread_tick(void) {
+	u64	ret;
+
+	__asm__ __volatile__("rd	%%asr24, %0 \n"
+			     ".section	.vread_tick_patch, \"ax\" \n"
+			     "rd	%%tick, %0 \n"
+			     ".previous \n"
+			     : "=&r" (ret));
+	return ret & ~TICK_PRIV_BIT;
+}
+#else
+static notrace noinline u64
+vread_tick(void)
+{
+	unsigned int lo, hi;
+
+	__asm__ __volatile__("rd	%%asr24, %%g1\n\t"
+			     "srlx	%%g1, 32, %1\n\t"
+			     "srl	%%g1, 0, %0\n"
+			     ".section	.vread_tick_patch, \"ax\" \n"
+			     "rd	%%tick, %%g1\n"
+			     ".previous \n"
+			     : "=&r" (lo), "=&r" (hi)
+			     :
+			     : "g1");
+	return lo | ((u64)hi << 32);
+}
+#endif
+
+static notrace inline u64
+vgetsns(struct vvar_data *vvar)
+{
+	u64 v;
+	u64 cycles;
+
+	cycles = vread_tick();
+	v = (cycles - vvar->clock.cycle_last) & vvar->clock.mask;
+	return v * vvar->clock.mult;
+}
+
+static notrace noinline int
+do_realtime(struct vvar_data *vvar, struct timespec *ts)
+{
+	unsigned long seq;
+	u64 ns;
+
+	ts->tv_nsec = 0;
+	do {
+		seq = vvar_read_begin(vvar);
+		ts->tv_sec = vvar->wall_time_sec;
+		ns = vvar->wall_time_snsec;
+		ns += vgetsns(vvar);
+		ns >>= vvar->clock.shift;
+	} while (unlikely(vvar_read_retry(vvar, seq)));
+
+	timespec_add_ns(ts, ns);
+
+	return 0;
+}
+
+static notrace noinline int
+do_monotonic(struct vvar_data *vvar, struct timespec *ts)
+{
+	unsigned long seq;
+	u64 ns;
+
+	ts->tv_nsec = 0;
+	do {
+		seq = vvar_read_begin(vvar);
+		ts->tv_sec = vvar->monotonic_time_sec;
+		ns = vvar->monotonic_time_snsec;
+		ns += vgetsns(vvar);
+		ns >>= vvar->clock.shift;
+	} while (unlikely(vvar_read_retry(vvar, seq)));
+
+	timespec_add_ns(ts, ns);
+
+	return 0;
+}
+
+static notrace noinline int
+do_realtime_coarse(struct vvar_data *vvar, struct timespec *ts)
+{
+	unsigned long seq;
+
+	do {
+		seq = vvar_read_begin(vvar);
+		ts->tv_sec = vvar->wall_time_coarse_sec;
+		ts->tv_nsec = vvar->wall_time_coarse_nsec;
+	} while (unlikely(vvar_read_retry(vvar, seq)));
+	return 0;
+}
+
+static notrace noinline int
+do_monotonic_coarse(struct vvar_data *vvar, struct timespec *ts)
+{
+	unsigned long seq;
+
+	do {
+		seq = vvar_read_begin(vvar);
+		ts->tv_sec = vvar->monotonic_time_coarse_sec;
+		ts->tv_nsec = vvar->monotonic_time_coarse_nsec;
+	} while (unlikely(vvar_read_retry(vvar, seq)));
+
+	return 0;
+}
+
+notrace int
+__vdso_clock_gettime(clockid_t clock, struct timespec *ts)
+{
+	struct vvar_data *vvd = get_vvar_data();
+
+	switch (clock) {
+	case CLOCK_REALTIME:
+		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
+			break;
+		return do_realtime(vvd, ts);
+	case CLOCK_MONOTONIC:
+		if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
+			break;
+		return do_monotonic(vvd, ts);
+	case CLOCK_REALTIME_COARSE:
+		return do_realtime_coarse(vvd, ts);
+	case CLOCK_MONOTONIC_COARSE:
+		return do_monotonic_coarse(vvd, ts);
+	}
+	/*
+	 * Unknown clock ID ? Fall back to the syscall.
+	 */
+	return vdso_fallback_gettime(clock, ts);
+}
+int
+clock_gettime(clockid_t, struct timespec *)
+	__attribute__((weak, alias("__vdso_clock_gettime")));
+
+notrace int
+__vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+	struct vvar_data *vvd = get_vvar_data();
+
+	if (likely(vvd->vclock_mode != VCLOCK_NONE)) {
+		if (likely(tv != NULL)) {
+			union tstv_t {
+				struct timespec ts;
+				struct timeval tv;
+			} *tstv = (union tstv_t *) tv;
+			do_realtime(vvd, &tstv->ts);
+			/*
+			 * Assign before dividing to ensure that the division is
+			 * done in the type of tv_usec, not tv_nsec.
+			 *
+			 * There cannot be > 1 billion usec in a second:
+			 * do_realtime() has already distributed such overflow
+			 * into tv_sec.  So we can assign it to an int safely.
+			 */
+			tstv->tv.tv_usec = tstv->ts.tv_nsec;
+			tstv->tv.tv_usec /= 1000;
+		}
+		if (unlikely(tz != NULL)) {
+			/* Avoid memcpy. Some old compilers fail to inline it */
+			tz->tz_minuteswest = vvd->tz_minuteswest;
+			tz->tz_dsttime = vvd->tz_dsttime;
+		}
+		return 0;
+	}
+	return vdso_fallback_gettimeofday(tv, tz);
+}
+int
+gettimeofday(struct timeval *, struct timezone *)
+	__attribute__((weak, alias("__vdso_gettimeofday")));