Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer changes from Ingo Molnar:
 "Main changes in this cycle were:

   - Updated full dynticks support.

   - Event stream support for architected (ARM) timers.

   - ARM clocksource driver updates.

   - Move arm64 to using the generic sched_clock framework & resulting
     cleanup in the generic sched_clock code.

   - Misc fixes and cleanups"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (50 commits)
  x86/time: Honor ACPI FADT flag indicating absence of a CMOS RTC
  clocksource: sun4i: remove IRQF_DISABLED
  clocksource: sun4i: Report the minimum tick that we can program
  clocksource: sun4i: Select CLKSRC_MMIO
  clocksource: Provide timekeeping for efm32 SoCs
  clocksource: em_sti: convert to clk_prepare/unprepare
  time: Fix signedness bug in sysfs_get_uname() and its callers
  timekeeping: Fix some trivial typos in comments
  alarmtimer: return EINVAL instead of ENOTSUPP if rtcdev doesn't exist
  clocksource: arch_timer: Do not register arch_sys_counter twice
  timer stats: Add a 'Collection: active/inactive' line to timer usage statistics
  sched_clock: Remove sched_clock_func() hook
  arch_timer: Move to generic sched_clock framework
  clocksource: tcb_clksrc: Remove IRQF_DISABLED
  clocksource: tcb_clksrc: Improve driver robustness
  clocksource: tcb_clksrc: Replace clk_enable/disable with clk_prepare_enable/disable_unprepare
  clocksource: arm_arch_timer: Use clocksource for suspend timekeeping
  clocksource: dw_apb_timer_of: Mark a few more functions as __init
  clocksource: Put nodes passed to CLOCKSOURCE_OF_DECLARE callbacks centrally
  arm: zynq: Enable arm_global_timer
  ...

8 files changed, 43 insertions, 20 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 04163fece49f..aa8300333bc5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -54,6 +54,7 @@ config ARM
         select HAVE_REGS_AND_STACK_ACCESS_API
         select HAVE_SYSCALL_TRACEPOINTS
         select HAVE_UID16
+        select HAVE_VIRT_CPU_ACCOUNTING_GEN
         select IRQ_FORCED_THREADING
         select KTIME_SCALAR
         select MODULES_USE_ELF_REL
diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi
index e32b92b949d2..e7f73b2e4550 100644
--- a/arch/arm/boot/dts/zynq-7000.dtsi
+++ b/arch/arm/boot/dts/zynq-7000.dtsi
@@ -92,6 +92,14 @@
                         };
                 };
 
+                global_timer: timer@f8f00200 {
+                        compatible = "arm,cortex-a9-global-timer";
+                        reg = <0xf8f00200 0x20>;
+                        interrupts = <1 11 0x301>;
+                        interrupt-parent = <&intc>;
+                        clocks = <&clkc 4>;
+                };
+
                 ttc0: ttc0@f8001000 {
                         interrupt-parent = <&intc>;
                         interrupts = < 0 10 4 0 11 4 0 12 4 >;
diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index 5665134bfa3e..0704e0cf5571 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -87,17 +87,43 @@ static inline u64 arch_counter_get_cntvct(void)
         return cval;
 }
 
-static inline void arch_counter_set_user_access(void)
+static inline u32 arch_timer_get_cntkctl(void)
 {
         u32 cntkctl;
-
         asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
+        return cntkctl;
+}
 
-        /* disable user access to everything */
-        cntkctl &= ~((3 << 8) | (7 << 0));
-
+static inline void arch_timer_set_cntkctl(u32 cntkctl)
+{
         asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
 }
+
+static inline void arch_counter_set_user_access(void)
+{
+        u32 cntkctl = arch_timer_get_cntkctl();
+
+        /* Disable user access to both physical/virtual counters/timers */
+        /* Also disable virtual event stream */
+        cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
+                        | ARCH_TIMER_USR_VT_ACCESS_EN
+                        | ARCH_TIMER_VIRT_EVT_EN
+                        | ARCH_TIMER_USR_VCT_ACCESS_EN
+                        | ARCH_TIMER_USR_PCT_ACCESS_EN);
+        arch_timer_set_cntkctl(cntkctl);
+}
+
+static inline void arch_timer_evtstrm_enable(int divider)
+{
+        u32 cntkctl = arch_timer_get_cntkctl();
+        cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
+        /* Set the divider and enable virtual event stream */
+        cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
+                        | ARCH_TIMER_VIRT_EVT_EN;
+        arch_timer_set_cntkctl(cntkctl);
+        elf_hwcap |= HWCAP_EVTSTRM;
+}
+
 #endif
 
 #endif
diff --git a/arch/arm/include/uapi/asm/hwcap.h b/arch/arm/include/uapi/asm/hwcap.h
index 6d34d080372a..7dcc10d67253 100644
--- a/arch/arm/include/uapi/asm/hwcap.h
+++ b/arch/arm/include/uapi/asm/hwcap.h
@@ -26,5 +26,6 @@
 #define HWCAP_VFPD32    (1 << 19)       /* set if VFP has 32 regs (not 16) */
 #define HWCAP_IDIV      (HWCAP_IDIVA | HWCAP_IDIVT)
 #define HWCAP_LPAE      (1 << 20)
+#define HWCAP_EVTSTRM   (1 << 21)
 
 #endif /* _UAPI__ASMARM_HWCAP_H */
diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
index 221f07b11ccb..1791f12c180b 100644
--- a/arch/arm/kernel/arch_timer.c
+++ b/arch/arm/kernel/arch_timer.c
@@ -11,7 +11,6 @@
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/errno.h>
-#include <linux/sched_clock.h>
 
 #include <asm/delay.h>
 
@@ -22,13 +21,6 @@ static unsigned long arch_timer_read_counter_long(void)
         return arch_timer_read_counter();
 }
 
-static u32 sched_clock_mult __read_mostly;
-
-static unsigned long long notrace arch_timer_sched_clock(void)
-{
-        return arch_timer_read_counter() * sched_clock_mult;
-}
-
 static struct delay_timer arch_delay_timer;
 
 static void __init arch_timer_delay_timer_register(void)
@@ -48,11 +40,5 @@ int __init arch_timer_arch_init(void)
 
         arch_timer_delay_timer_register();
 
-        /* Cache the sched_clock multiplier to save a divide in the hot path. */
-        sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
-        sched_clock_func = arch_timer_sched_clock;
-        pr_info("sched_clock: ARM arch timer >56 bits at %ukHz, resolution %uns\n",
-                arch_timer_rate / 1000, sched_clock_mult);
-
         return 0;
 }
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 0e1e2b3afa45..5d65438685d8 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -975,6 +975,7 @@ static const char *hwcap_str[] = {
         "idivt",
         "vfpd32",
         "lpae",
+        "evtstrm",
         NULL
 };
 
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 696fb73296d0..1e9c3383daba 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -274,7 +274,6 @@ static void __init msm_dt_timer_init(struct device_node *np)
                 pr_err("Unknown frequency\n");
                 return;
         }
-        of_node_put(np);
 
         event_base = base + 0x4;
         sts_base = base + 0x88;
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 04f8a4a6e755..6b04260aa142 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -13,5 +13,6 @@ config ARCH_ZYNQ
         select HAVE_SMP
         select SPARSE_IRQ
         select CADENCE_TTC_TIMER
+        select ARM_GLOBAL_TIMER
         help
           Support for Xilinx Zynq ARM Cortex A9 Platform