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-rw-r--r--drivers/gator/gator_main.c1532
1 files changed, 1532 insertions, 0 deletions
diff --git a/drivers/gator/gator_main.c b/drivers/gator/gator_main.c
new file mode 100644
index 00000000000..19f51c7cd8e
--- /dev/null
+++ b/drivers/gator/gator_main.c
@@ -0,0 +1,1532 @@
+/**
+ * Copyright (C) ARM Limited 2010-2013. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+// This version must match the gator daemon version
+#define PROTOCOL_VERSION 17
+static unsigned long gator_protocol_version = PROTOCOL_VERSION;
+
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <linux/sched.h>
+#include <linux/irq.h>
+#include <linux/vmalloc.h>
+#include <linux/hardirq.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/perf_event.h>
+#include <linux/utsname.h>
+#include <linux/kthread.h>
+#include <asm/stacktrace.h>
+#include <asm/uaccess.h>
+
+#include "gator.h"
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
+#error kernels prior to 2.6.32 are not supported
+#endif
+
+#if defined(MODULE) && !defined(CONFIG_MODULES)
+#error Cannot build a module against a kernel that does not support modules. To resolve, either rebuild the kernel to support modules or build gator as part of the kernel.
+#endif
+
+#if !defined(CONFIG_GENERIC_TRACER) && !defined(CONFIG_TRACING)
+#error gator requires the kernel to have CONFIG_GENERIC_TRACER or CONFIG_TRACING defined
+#endif
+
+#ifndef CONFIG_PROFILING
+#error gator requires the kernel to have CONFIG_PROFILING defined
+#endif
+
+#ifndef CONFIG_HIGH_RES_TIMERS
+#error gator requires the kernel to have CONFIG_HIGH_RES_TIMERS defined to support PC sampling
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && defined(__arm__) && defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)
+#error gator requires the kernel to have CONFIG_LOCAL_TIMERS defined on SMP systems
+#endif
+
+#if (GATOR_PERF_SUPPORT) && (!(GATOR_PERF_PMU_SUPPORT))
+#ifndef CONFIG_PERF_EVENTS
+#warning gator requires the kernel to have CONFIG_PERF_EVENTS defined to support pmu hardware counters
+#elif !defined CONFIG_HW_PERF_EVENTS
+#warning gator requires the kernel to have CONFIG_HW_PERF_EVENTS defined to support pmu hardware counters
+#endif
+#endif
+
+/******************************************************************************
+ * DEFINES
+ ******************************************************************************/
+#define SUMMARY_BUFFER_SIZE (1*1024)
+#define BACKTRACE_BUFFER_SIZE (128*1024)
+#define NAME_BUFFER_SIZE (64*1024)
+#define COUNTER_BUFFER_SIZE (64*1024) // counters have the core as part of the data and the core value in the frame header may be discarded
+#define BLOCK_COUNTER_BUFFER_SIZE (128*1024)
+#define ANNOTATE_BUFFER_SIZE (128*1024) // annotate counters have the core as part of the data and the core value in the frame header may be discarded
+#define SCHED_TRACE_BUFFER_SIZE (128*1024)
+#define GPU_TRACE_BUFFER_SIZE (64*1024) // gpu trace counters have the core as part of the data and the core value in the frame header may be discarded
+#define IDLE_BUFFER_SIZE (32*1024) // idle counters have the core as part of the data and the core value in the frame header may be discarded
+
+#define NO_COOKIE 0U
+#define UNRESOLVED_COOKIE ~0U
+
+#define FRAME_SUMMARY 1
+#define FRAME_BACKTRACE 2
+#define FRAME_NAME 3
+#define FRAME_COUNTER 4
+#define FRAME_BLOCK_COUNTER 5
+#define FRAME_ANNOTATE 6
+#define FRAME_SCHED_TRACE 7
+#define FRAME_GPU_TRACE 8
+#define FRAME_IDLE 9
+
+#define MESSAGE_END_BACKTRACE 1
+
+#define MESSAGE_COOKIE 1
+#define MESSAGE_THREAD_NAME 2
+#define HRTIMER_CORE_NAME 3
+#define MESSAGE_LINK 4
+
+#define MESSAGE_GPU_START 1
+#define MESSAGE_GPU_STOP 2
+
+#define MESSAGE_SCHED_SWITCH 1
+#define MESSAGE_SCHED_EXIT 2
+#define MESSAGE_SCHED_START 3
+
+#define MESSAGE_IDLE_ENTER 1
+#define MESSAGE_IDLE_EXIT 2
+
+#define MAXSIZE_PACK32 5
+#define MAXSIZE_PACK64 10
+
+#define FRAME_HEADER_SIZE 3
+
+#if defined(__arm__)
+#define PC_REG regs->ARM_pc
+#elif defined(__aarch64__)
+#define PC_REG regs->pc
+#else
+#define PC_REG regs->ip
+#endif
+
+enum {
+ SUMMARY_BUF,
+ BACKTRACE_BUF,
+ NAME_BUF,
+ COUNTER_BUF,
+ BLOCK_COUNTER_BUF,
+ ANNOTATE_BUF,
+ SCHED_TRACE_BUF,
+ GPU_TRACE_BUF,
+ IDLE_BUF,
+ NUM_GATOR_BUFS
+};
+
+/******************************************************************************
+ * Globals
+ ******************************************************************************/
+static unsigned long gator_cpu_cores;
+// Size of the largest buffer. Effectively constant, set in gator_op_create_files
+static unsigned long userspace_buffer_size;
+static unsigned long gator_backtrace_depth;
+// How often to commit the buffers for live in nanoseconds
+static u64 gator_live_rate;
+
+static unsigned long gator_started;
+static u64 gator_monotonic_started;
+static u64 gator_hibernate_time;
+static unsigned long gator_buffer_opened;
+static unsigned long gator_timer_count;
+static unsigned long gator_response_type;
+static DEFINE_MUTEX(start_mutex);
+static DEFINE_MUTEX(gator_buffer_mutex);
+
+bool event_based_sampling;
+
+static DECLARE_WAIT_QUEUE_HEAD(gator_buffer_wait);
+static DECLARE_WAIT_QUEUE_HEAD(gator_annotate_wait);
+static struct timer_list gator_buffer_wake_up_timer;
+static bool gator_buffer_wake_stop;
+static struct task_struct *gator_buffer_wake_thread;
+static LIST_HEAD(gator_events);
+
+static DEFINE_PER_CPU(u64, last_timestamp);
+
+static bool printed_monotonic_warning;
+
+static bool sent_core_name[NR_CPUS];
+
+/******************************************************************************
+ * Prototypes
+ ******************************************************************************/
+static void buffer_check(int cpu, int buftype, u64 time);
+static void gator_commit_buffer(int cpu, int buftype, u64 time);
+static int buffer_bytes_available(int cpu, int buftype);
+static bool buffer_check_space(int cpu, int buftype, int bytes);
+static int contiguous_space_available(int cpu, int bufytpe);
+static void gator_buffer_write_packed_int(int cpu, int buftype, int x);
+static void gator_buffer_write_packed_int64(int cpu, int buftype, long long x);
+static void gator_buffer_write_bytes(int cpu, int buftype, const char *x, int len);
+static void gator_buffer_write_string(int cpu, int buftype, const char *x);
+static void gator_add_trace(int cpu, unsigned long address);
+static void gator_add_sample(int cpu, struct pt_regs *const regs, u64 time);
+static u64 gator_get_time(void);
+
+// Size of the buffer, must be a power of 2. Effectively constant, set in gator_op_setup.
+static uint32_t gator_buffer_size[NUM_GATOR_BUFS];
+// gator_buffer_size - 1, bitwise and with pos to get offset into the array. Effectively constant, set in gator_op_setup.
+static uint32_t gator_buffer_mask[NUM_GATOR_BUFS];
+// Read position in the buffer. Initialized to zero in gator_op_setup and incremented after bytes are read by userspace in userspace_buffer_read
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_read);
+// Write position in the buffer. Initialized to zero in gator_op_setup and incremented after bytes are written to the buffer
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_write);
+// Commit position in the buffer. Initialized to zero in gator_op_setup and incremented after a frame is ready to be read by userspace
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], gator_buffer_commit);
+// If set to false, decreases the number of bytes returned by buffer_bytes_available. Set in buffer_check_space if no space is remaining. Initialized to true in gator_op_setup
+// This means that if we run out of space, continue to report that no space is available until bytes are read by userspace
+static DEFINE_PER_CPU(int[NUM_GATOR_BUFS], buffer_space_available);
+// The buffer. Allocated in gator_op_setup
+static DEFINE_PER_CPU(char *[NUM_GATOR_BUFS], gator_buffer);
+// The time after which the buffer should be committed for live display
+static DEFINE_PER_CPU(u64, gator_buffer_commit_time);
+
+// List of all gator events - new events must be added to this list
+#define GATOR_EVENTS_LIST \
+ GATOR_EVENT(gator_events_armv6_init) \
+ GATOR_EVENT(gator_events_armv7_init) \
+ GATOR_EVENT(gator_events_block_init) \
+ GATOR_EVENT(gator_events_ccn504_init) \
+ GATOR_EVENT(gator_events_irq_init) \
+ GATOR_EVENT(gator_events_l2c310_init) \
+ GATOR_EVENT(gator_events_mali_init) \
+ GATOR_EVENT(gator_events_mali_t6xx_hw_init) \
+ GATOR_EVENT(gator_events_mali_t6xx_init) \
+ GATOR_EVENT(gator_events_meminfo_init) \
+ GATOR_EVENT(gator_events_mmapped_init) \
+ GATOR_EVENT(gator_events_net_init) \
+ GATOR_EVENT(gator_events_perf_pmu_init) \
+ GATOR_EVENT(gator_events_sched_init) \
+ GATOR_EVENT(gator_events_scorpion_init) \
+
+#define GATOR_EVENT(EVENT_INIT) __weak int EVENT_INIT(void);
+GATOR_EVENTS_LIST
+#undef GATOR_EVENT
+
+static int (*gator_events_list[])(void) = {
+#define GATOR_EVENT(EVENT_INIT) EVENT_INIT,
+GATOR_EVENTS_LIST
+#undef GATOR_EVENT
+};
+
+/******************************************************************************
+ * Application Includes
+ ******************************************************************************/
+#include "gator_marshaling.c"
+#include "gator_hrtimer_perf.c"
+#include "gator_hrtimer_gator.c"
+#include "gator_cookies.c"
+#include "gator_annotate.c"
+#include "gator_trace_sched.c"
+#include "gator_trace_power.c"
+#include "gator_trace_gpu.c"
+#include "gator_backtrace.c"
+#include "gator_fs.c"
+#include "gator_pack.c"
+
+/******************************************************************************
+ * Misc
+ ******************************************************************************/
+
+const struct gator_cpu gator_cpus[] = {
+ {
+ .cpuid = ARM1136,
+ .core_name = "ARM1136",
+ .pmnc_name = "ARM_ARM11",
+ .dt_name = "arm,arm1136",
+ .pmnc_counters = 3,
+ },
+ {
+ .cpuid = ARM1156,
+ .core_name = "ARM1156",
+ .pmnc_name = "ARM_ARM11",
+ .dt_name = "arm,arm1156",
+ .pmnc_counters = 3,
+ },
+ {
+ .cpuid = ARM1176,
+ .core_name = "ARM1176",
+ .pmnc_name = "ARM_ARM11",
+ .dt_name = "arm,arm1176",
+ .pmnc_counters = 3,
+ },
+ {
+ .cpuid = ARM11MPCORE,
+ .core_name = "ARM11MPCore",
+ .pmnc_name = "ARM_ARM11MPCore",
+ .dt_name = "arm,arm11mpcore",
+ .pmnc_counters = 3,
+ },
+ {
+ .cpuid = CORTEX_A5,
+ .core_name = "Cortex-A5",
+ .pmu_name = "ARMv7_Cortex_A5",
+ .pmnc_name = "ARM_Cortex-A5",
+ .dt_name = "arm,cortex-a5",
+ .pmnc_counters = 2,
+ },
+ {
+ .cpuid = CORTEX_A7,
+ .core_name = "Cortex-A7",
+ .pmu_name = "ARMv7_Cortex_A7",
+ .pmnc_name = "ARM_Cortex-A7",
+ .dt_name = "arm,cortex-a7",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = CORTEX_A8,
+ .core_name = "Cortex-A8",
+ .pmu_name = "ARMv7_Cortex_A8",
+ .pmnc_name = "ARM_Cortex-A8",
+ .dt_name = "arm,cortex-a8",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = CORTEX_A9,
+ .core_name = "Cortex-A9",
+ .pmu_name = "ARMv7_Cortex_A9",
+ .pmnc_name = "ARM_Cortex-A9",
+ .dt_name = "arm,cortex-a9",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = CORTEX_A12,
+ .core_name = "Cortex-A12",
+ .pmu_name = "ARMv7_Cortex_A12",
+ .pmnc_name = "ARM_Cortex-A12",
+ .dt_name = "arm,cortex-a12",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = CORTEX_A15,
+ .core_name = "Cortex-A15",
+ .pmu_name = "ARMv7_Cortex_A15",
+ .pmnc_name = "ARM_Cortex-A15",
+ .dt_name = "arm,cortex-a15",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = SCORPION,
+ .core_name = "Scorpion",
+ .pmnc_name = "Scorpion",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = SCORPIONMP,
+ .core_name = "ScorpionMP",
+ .pmnc_name = "ScorpionMP",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = KRAITSIM,
+ .core_name = "KraitSIM",
+ .pmnc_name = "Krait",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = KRAIT,
+ .core_name = "Krait",
+ .pmnc_name = "Krait",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = KRAIT_S4_PRO,
+ .core_name = "Krait S4 Pro",
+ .pmnc_name = "Krait",
+ .pmnc_counters = 4,
+ },
+ {
+ .cpuid = CORTEX_A53,
+ .core_name = "Cortex-A53",
+ .pmnc_name = "ARM_Cortex-A53",
+ .dt_name = "arm,cortex-a53",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = CORTEX_A57,
+ .core_name = "Cortex-A57",
+ .pmnc_name = "ARM_Cortex-A57",
+ .dt_name = "arm,cortex-a57",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = AARCH64,
+ .core_name = "AArch64",
+ .pmnc_name = "ARM_AArch64",
+ .pmnc_counters = 6,
+ },
+ {
+ .cpuid = OTHER,
+ .core_name = "Other",
+ .pmnc_name = "Other",
+ .pmnc_counters = 6,
+ },
+ {}
+};
+
+const struct gator_cpu *gator_find_cpu_by_cpuid(const u32 cpuid)
+{
+ int i;
+
+ for (i = 0; gator_cpus[i].cpuid != 0; ++i) {
+ const struct gator_cpu *const gator_cpu = &gator_cpus[i];
+ if (gator_cpu->cpuid == cpuid) {
+ return gator_cpu;
+ }
+ }
+
+ return NULL;
+}
+
+const struct gator_cpu *gator_find_cpu_by_pmu_name(const char *const name)
+{
+ int i;
+
+ for (i = 0; gator_cpus[i].cpuid != 0; ++i) {
+ const struct gator_cpu *const gator_cpu = &gator_cpus[i];
+ if (gator_cpu->pmu_name != NULL && strcmp(gator_cpu->pmu_name, name) == 0) {
+ return gator_cpu;
+ }
+ }
+
+ return NULL;
+}
+
+u32 gator_cpuid(void)
+{
+#if defined(__arm__) || defined(__aarch64__)
+ u32 val;
+#if !defined(__aarch64__)
+ asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r" (val));
+#else
+ asm volatile("mrs %0, midr_el1" : "=r" (val));
+#endif
+ return (val >> 4) & 0xfff;
+#else
+ return OTHER;
+#endif
+}
+
+static void gator_buffer_wake_up(unsigned long data)
+{
+ wake_up(&gator_buffer_wait);
+}
+
+static int gator_buffer_wake_func(void *data)
+{
+ while (!gator_buffer_wake_stop) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ if (gator_buffer_wake_stop) {
+ break;
+ }
+
+ gator_buffer_wake_up(0);
+ }
+
+ return 0;
+}
+
+/******************************************************************************
+ * Commit interface
+ ******************************************************************************/
+static bool buffer_commit_ready(int *cpu, int *buftype)
+{
+ int cpu_x, x;
+ for_each_present_cpu(cpu_x) {
+ for (x = 0; x < NUM_GATOR_BUFS; x++)
+ if (per_cpu(gator_buffer_commit, cpu_x)[x] != per_cpu(gator_buffer_read, cpu_x)[x]) {
+ *cpu = cpu_x;
+ *buftype = x;
+ return true;
+ }
+ }
+ *cpu = -1;
+ *buftype = -1;
+ return false;
+}
+
+/******************************************************************************
+ * Buffer management
+ ******************************************************************************/
+static int buffer_bytes_available(int cpu, int buftype)
+{
+ int remaining, filled;
+
+ filled = per_cpu(gator_buffer_write, cpu)[buftype] - per_cpu(gator_buffer_read, cpu)[buftype];
+ if (filled < 0) {
+ filled += gator_buffer_size[buftype];
+ }
+
+ remaining = gator_buffer_size[buftype] - filled;
+
+ if (per_cpu(buffer_space_available, cpu)[buftype]) {
+ // Give some extra room; also allows space to insert the overflow error packet
+ remaining -= 200;
+ } else {
+ // Hysteresis, prevents multiple overflow messages
+ remaining -= 2000;
+ }
+
+ return remaining;
+}
+
+static int contiguous_space_available(int cpu, int buftype)
+{
+ int remaining = buffer_bytes_available(cpu, buftype);
+ int contiguous = gator_buffer_size[buftype] - per_cpu(gator_buffer_write, cpu)[buftype];
+ if (remaining < contiguous)
+ return remaining;
+ else
+ return contiguous;
+}
+
+static bool buffer_check_space(int cpu, int buftype, int bytes)
+{
+ int remaining = buffer_bytes_available(cpu, buftype);
+
+ if (remaining < bytes) {
+ per_cpu(buffer_space_available, cpu)[buftype] = false;
+ } else {
+ per_cpu(buffer_space_available, cpu)[buftype] = true;
+ }
+
+ return per_cpu(buffer_space_available, cpu)[buftype];
+}
+
+static void gator_buffer_write_bytes(int cpu, int buftype, const char *x, int len)
+{
+ int i;
+ u32 write = per_cpu(gator_buffer_write, cpu)[buftype];
+ u32 mask = gator_buffer_mask[buftype];
+ char *buffer = per_cpu(gator_buffer, cpu)[buftype];
+
+ for (i = 0; i < len; i++) {
+ buffer[write] = x[i];
+ write = (write + 1) & mask;
+ }
+
+ per_cpu(gator_buffer_write, cpu)[buftype] = write;
+}
+
+static void gator_buffer_write_string(int cpu, int buftype, const char *x)
+{
+ int len = strlen(x);
+ gator_buffer_write_packed_int(cpu, buftype, len);
+ gator_buffer_write_bytes(cpu, buftype, x, len);
+}
+
+static void gator_commit_buffer(int cpu, int buftype, u64 time)
+{
+ int type_length, commit, length, byte;
+
+ if (!per_cpu(gator_buffer, cpu)[buftype])
+ return;
+
+ // post-populate the length, which does not include the response type length nor the length itself, i.e. only the length of the payload
+ type_length = gator_response_type ? 1 : 0;
+ commit = per_cpu(gator_buffer_commit, cpu)[buftype];
+ length = per_cpu(gator_buffer_write, cpu)[buftype] - commit;
+ if (length < 0) {
+ length += gator_buffer_size[buftype];
+ }
+ length = length - type_length - sizeof(s32);
+
+ if (length <= FRAME_HEADER_SIZE) {
+ // Nothing to write, only the frame header is present
+ return;
+ }
+
+ for (byte = 0; byte < sizeof(s32); byte++) {
+ per_cpu(gator_buffer, cpu)[buftype][(commit + type_length + byte) & gator_buffer_mask[buftype]] = (length >> byte * 8) & 0xFF;
+ }
+
+ per_cpu(gator_buffer_commit, cpu)[buftype] = per_cpu(gator_buffer_write, cpu)[buftype];
+
+ if (gator_live_rate > 0) {
+ while (time > per_cpu(gator_buffer_commit_time, cpu)) {
+ per_cpu(gator_buffer_commit_time, cpu) += gator_live_rate;
+ }
+ }
+
+ marshal_frame(cpu, buftype);
+
+ // had to delay scheduling work as attempting to schedule work during the context switch is illegal in kernel versions 3.5 and greater
+ if (per_cpu(in_scheduler_context, cpu)) {
+#ifndef CONFIG_PREEMPT_RT_FULL
+ // mod_timer can not be used in interrupt context in RT-Preempt full
+ mod_timer(&gator_buffer_wake_up_timer, jiffies + 1);
+#endif
+ } else {
+ wake_up_process(gator_buffer_wake_thread);
+ }
+}
+
+static void buffer_check(int cpu, int buftype, u64 time)
+{
+ int filled = per_cpu(gator_buffer_write, cpu)[buftype] - per_cpu(gator_buffer_commit, cpu)[buftype];
+ if (filled < 0) {
+ filled += gator_buffer_size[buftype];
+ }
+ if (filled >= ((gator_buffer_size[buftype] * 3) / 4)) {
+ gator_commit_buffer(cpu, buftype, time);
+ }
+}
+
+static void gator_add_trace(int cpu, unsigned long address)
+{
+ off_t offset = 0;
+ unsigned long cookie = get_address_cookie(cpu, current, address & ~1, &offset);
+
+ if (cookie == NO_COOKIE || cookie == UNRESOLVED_COOKIE) {
+ offset = address;
+ }
+
+ marshal_backtrace(offset & ~1, cookie);
+}
+
+static void gator_add_sample(int cpu, struct pt_regs *const regs, u64 time)
+{
+ bool inKernel;
+ unsigned long exec_cookie;
+
+ if (!regs)
+ return;
+
+ inKernel = !user_mode(regs);
+ exec_cookie = get_exec_cookie(cpu, current);
+
+ if (!marshal_backtrace_header(exec_cookie, current->tgid, current->pid, inKernel, time))
+ return;
+
+ if (inKernel) {
+ kernel_backtrace(cpu, regs);
+ } else {
+ // Cookie+PC
+ gator_add_trace(cpu, PC_REG);
+
+ // Backtrace
+ if (gator_backtrace_depth)
+ arm_backtrace_eabi(cpu, regs, gator_backtrace_depth);
+ }
+
+ marshal_backtrace_footer(time);
+}
+
+/******************************************************************************
+ * hrtimer interrupt processing
+ ******************************************************************************/
+static void gator_timer_interrupt(void)
+{
+ struct pt_regs *const regs = get_irq_regs();
+ gator_backtrace_handler(regs);
+}
+
+void gator_backtrace_handler(struct pt_regs *const regs)
+{
+ u64 time = gator_get_time();
+ int cpu = get_physical_cpu();
+
+ // Output backtrace
+ gator_add_sample(cpu, regs, time);
+
+ // Collect counters
+ if (!per_cpu(collecting, cpu)) {
+ collect_counters(time, NULL);
+ }
+
+ // No buffer flushing occurs during sched switch for RT-Preempt full. The block counter frame will be flushed by collect_counters, but the sched buffer needs to be explicitly flushed
+#ifdef CONFIG_PREEMPT_RT_FULL
+ buffer_check(cpu, SCHED_TRACE_BUF, time);
+#endif
+}
+
+static int gator_running;
+
+// This function runs in interrupt context and on the appropriate core
+static void gator_timer_offline(void *migrate)
+{
+ struct gator_interface *gi;
+ int i, len, cpu = get_physical_cpu();
+ int *buffer;
+ u64 time;
+
+ gator_trace_sched_offline();
+ gator_trace_power_offline();
+
+ if (!migrate) {
+ gator_hrtimer_offline();
+ }
+
+ // Offline any events and output counters
+ time = gator_get_time();
+ if (marshal_event_header(time)) {
+ list_for_each_entry(gi, &gator_events, list) {
+ if (gi->offline) {
+ len = gi->offline(&buffer, migrate);
+ marshal_event(len, buffer);
+ }
+ }
+ // Only check after writing all counters so that time and corresponding counters appear in the same frame
+ buffer_check(cpu, BLOCK_COUNTER_BUF, time);
+ }
+
+ // Flush all buffers on this core
+ for (i = 0; i < NUM_GATOR_BUFS; i++)
+ gator_commit_buffer(cpu, i, time);
+}
+
+// This function runs in interrupt context and may be running on a core other than core 'cpu'
+static void gator_timer_offline_dispatch(int cpu, bool migrate)
+{
+ struct gator_interface *gi;
+
+ list_for_each_entry(gi, &gator_events, list) {
+ if (gi->offline_dispatch) {
+ gi->offline_dispatch(cpu, migrate);
+ }
+ }
+}
+
+static void gator_timer_stop(void)
+{
+ int cpu;
+
+ if (gator_running) {
+ on_each_cpu(gator_timer_offline, NULL, 1);
+ for_each_online_cpu(cpu) {
+ gator_timer_offline_dispatch(lcpu_to_pcpu(cpu), false);
+ }
+
+ gator_running = 0;
+ gator_hrtimer_shutdown();
+ }
+}
+
+#if defined(__arm__) || defined(__aarch64__)
+static void gator_send_core_name(int cpu, const u32 cpuid, const struct gator_cpu *const gator_cpu) {
+ const char *core_name = NULL;
+ char core_name_buf[32];
+
+ if (!sent_core_name[cpu]) {
+ if (gator_cpu != NULL) {
+ core_name = gator_cpu->core_name;
+ } else {
+ snprintf(core_name_buf, sizeof(core_name_buf), "Unknown (0x%.3x)", cpuid);
+ core_name = core_name_buf;
+ }
+
+ marshal_core_name(cpu, cpuid, core_name);
+ sent_core_name[cpu] = true;
+ }
+}
+#endif
+
+// This function runs in interrupt context and on the appropriate core
+static void gator_timer_online(void *migrate)
+{
+ struct gator_interface *gi;
+ int len, cpu = get_physical_cpu();
+ int *buffer;
+ u64 time;
+
+ gator_trace_power_online();
+
+ // online any events and output counters
+ time = gator_get_time();
+ if (marshal_event_header(time)) {
+ list_for_each_entry(gi, &gator_events, list) {
+ if (gi->online) {
+ len = gi->online(&buffer, migrate);
+ marshal_event(len, buffer);
+ }
+ }
+ // Only check after writing all counters so that time and corresponding counters appear in the same frame
+ buffer_check(cpu, BLOCK_COUNTER_BUF, time);
+ }
+
+ if (!migrate) {
+ gator_hrtimer_online();
+ }
+
+#if defined(__arm__) || defined(__aarch64__)
+ if (!sent_core_name[cpu]) {
+ const u32 cpuid = gator_cpuid();
+ gator_send_core_name(cpu, cpuid, gator_find_cpu_by_cpuid(cpuid));
+ }
+#endif
+}
+
+// This function runs in interrupt context and may be running on a core other than core 'cpu'
+static void gator_timer_online_dispatch(int cpu, bool migrate)
+{
+ struct gator_interface *gi;
+
+ list_for_each_entry(gi, &gator_events, list) {
+ if (gi->online_dispatch) {
+ gi->online_dispatch(cpu, migrate);
+ }
+ }
+}
+
+#include "gator_iks.c"
+
+int gator_timer_start(unsigned long sample_rate)
+{
+ int cpu;
+
+ if (gator_running) {
+ pr_notice("gator: already running\n");
+ return 0;
+ }
+
+ gator_running = 1;
+
+ // event based sampling trumps hr timer based sampling
+ if (event_based_sampling) {
+ sample_rate = 0;
+ }
+
+ if (gator_hrtimer_init(sample_rate, gator_timer_interrupt) == -1)
+ return -1;
+
+ gator_send_iks_core_names();
+ for_each_online_cpu(cpu) {
+ gator_timer_online_dispatch(lcpu_to_pcpu(cpu), false);
+ }
+ on_each_cpu(gator_timer_online, NULL, 1);
+
+ return 0;
+}
+
+static u64 gator_get_time(void)
+{
+ struct timespec ts;
+ u64 timestamp;
+ u64 prev_timestamp;
+ u64 delta;
+ int cpu = smp_processor_id();
+
+ // Match clock_gettime(CLOCK_MONOTONIC_RAW, &ts) from userspace
+ getrawmonotonic(&ts);
+ timestamp = timespec_to_ns(&ts);
+
+ // getrawmonotonic is not monotonic on all systems. Detect and attempt to correct these cases.
+ // up to 0.5ms delta has been seen on some systems, which can skew Streamline data when viewing at high resolution.
+ // This doesn't work well with interrupts, but that it's OK - the real concern is to catch big jumps in time
+ prev_timestamp = per_cpu(last_timestamp, cpu);
+ if (prev_timestamp <= timestamp) {
+ per_cpu(last_timestamp, cpu) = timestamp;
+ } else {
+ delta = prev_timestamp - timestamp;
+ // Log the error once
+ if (!printed_monotonic_warning && delta > 500000) {
+ printk(KERN_ERR "%s: getrawmonotonic is not monotonic cpu: %i delta: %lli\nSkew in Streamline data may be present at the fine zoom levels\n", __FUNCTION__, cpu, delta);
+ printed_monotonic_warning = true;
+ }
+ timestamp = prev_timestamp;
+ }
+
+ return timestamp - gator_monotonic_started;
+}
+
+/******************************************************************************
+ * cpu hotplug and pm notifiers
+ ******************************************************************************/
+static int __cpuinit gator_hotcpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
+{
+ int cpu = lcpu_to_pcpu((long)hcpu);
+
+ switch (action) {
+ case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
+ smp_call_function_single(cpu, gator_timer_offline, NULL, 1);
+ gator_timer_offline_dispatch(cpu, false);
+ break;
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ gator_timer_online_dispatch(cpu, false);
+ smp_call_function_single(cpu, gator_timer_online, NULL, 1);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __refdata gator_hotcpu_notifier = {
+ .notifier_call = gator_hotcpu_notify,
+};
+
+// n.b. calling "on_each_cpu" only runs on those that are online
+// Registered linux events are not disabled, so their counters will continue to collect
+static int gator_pm_notify(struct notifier_block *nb, unsigned long event, void *dummy)
+{
+ int cpu;
+ struct timespec ts;
+
+ switch (event) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+ unregister_hotcpu_notifier(&gator_hotcpu_notifier);
+ unregister_scheduler_tracepoints();
+ on_each_cpu(gator_timer_offline, NULL, 1);
+ for_each_online_cpu(cpu) {
+ gator_timer_offline_dispatch(lcpu_to_pcpu(cpu), false);
+ }
+
+ // Record the wallclock hibernate time
+ getnstimeofday(&ts);
+ gator_hibernate_time = timespec_to_ns(&ts) - gator_get_time();
+ break;
+ case PM_POST_HIBERNATION:
+ case PM_POST_SUSPEND:
+ // Adjust gator_monotonic_started for the time spent sleeping, as gator_get_time does not account for it
+ if (gator_hibernate_time > 0) {
+ getnstimeofday(&ts);
+ gator_monotonic_started += gator_hibernate_time + gator_get_time() - timespec_to_ns(&ts);
+ gator_hibernate_time = 0;
+ }
+
+ for_each_online_cpu(cpu) {
+ gator_timer_online_dispatch(lcpu_to_pcpu(cpu), false);
+ }
+ on_each_cpu(gator_timer_online, NULL, 1);
+ register_scheduler_tracepoints();
+ register_hotcpu_notifier(&gator_hotcpu_notifier);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block gator_pm_notifier = {
+ .notifier_call = gator_pm_notify,
+};
+
+static int gator_notifier_start(void)
+{
+ int retval;
+ retval = register_hotcpu_notifier(&gator_hotcpu_notifier);
+ if (retval == 0)
+ retval = register_pm_notifier(&gator_pm_notifier);
+ return retval;
+}
+
+static void gator_notifier_stop(void)
+{
+ unregister_pm_notifier(&gator_pm_notifier);
+ unregister_hotcpu_notifier(&gator_hotcpu_notifier);
+}
+
+/******************************************************************************
+ * Main
+ ******************************************************************************/
+static void gator_summary(void)
+{
+ u64 timestamp, uptime;
+ struct timespec ts;
+ char uname_buf[512];
+ void (*m2b)(struct timespec *ts);
+ unsigned long flags;
+
+ snprintf(uname_buf, sizeof(uname_buf), "%s %s %s %s %s GNU/Linux", utsname()->sysname, utsname()->nodename, utsname()->release, utsname()->version, utsname()->machine);
+
+ getnstimeofday(&ts);
+ timestamp = timespec_to_ns(&ts);
+
+ do_posix_clock_monotonic_gettime(&ts);
+ // monotonic_to_bootbased is not defined for some versions of Android
+ m2b = symbol_get(monotonic_to_bootbased);
+ if (m2b) {
+ m2b(&ts);
+ }
+ uptime = timespec_to_ns(&ts);
+
+ // Disable interrupts as gator_get_time calls smp_processor_id to verify time is monotonic
+ local_irq_save(flags);
+ // Set monotonic_started to zero as gator_get_time is uptime minus monotonic_started
+ gator_monotonic_started = 0;
+ gator_monotonic_started = gator_get_time();
+ local_irq_restore(flags);
+
+ marshal_summary(timestamp, uptime, gator_monotonic_started, uname_buf);
+}
+
+int gator_events_install(struct gator_interface *interface)
+{
+ list_add_tail(&interface->list, &gator_events);
+
+ return 0;
+}
+
+int gator_events_get_key(void)
+{
+ // key 0 is reserved as a timestamp
+ // key 1 is reserved as the marker for thread specific counters
+ // Odd keys are assigned by the driver, even keys by the daemon
+ static int key = 3;
+
+ const int ret = key;
+ key += 2;
+ return ret;
+}
+
+static int gator_init(void)
+{
+ int i;
+
+ calc_first_cluster_size();
+
+ // events sources
+ for (i = 0; i < ARRAY_SIZE(gator_events_list); i++)
+ if (gator_events_list[i])
+ gator_events_list[i]();
+
+ gator_trace_sched_init();
+ gator_trace_power_init();
+
+ return 0;
+}
+
+static void gator_exit(void)
+{
+ struct gator_interface *gi;
+
+ list_for_each_entry(gi, &gator_events, list)
+ if (gi->shutdown)
+ gi->shutdown();
+}
+
+static int gator_start(void)
+{
+ unsigned long cpu, i;
+ struct gator_interface *gi;
+
+ gator_buffer_wake_stop = false;
+ if (IS_ERR(gator_buffer_wake_thread = kthread_run(gator_buffer_wake_func, NULL, "gator_bwake"))) {
+ goto bwake_failure;
+ }
+
+ if (gator_migrate_start())
+ goto migrate_failure;
+
+ // Initialize the buffer with the frame type and core
+ for_each_present_cpu(cpu) {
+ for (i = 0; i < NUM_GATOR_BUFS; i++) {
+ marshal_frame(cpu, i);
+ }
+ per_cpu(last_timestamp, cpu) = 0;
+ }
+ printed_monotonic_warning = false;
+
+ // Capture the start time
+ gator_summary();
+
+ // start all events
+ list_for_each_entry(gi, &gator_events, list) {
+ if (gi->start && gi->start() != 0) {
+ struct list_head *ptr = gi->list.prev;
+
+ while (ptr != &gator_events) {
+ gi = list_entry(ptr, struct gator_interface, list);
+
+ if (gi->stop)
+ gi->stop();
+
+ ptr = ptr->prev;
+ }
+ goto events_failure;
+ }
+ }
+
+ // cookies shall be initialized before trace_sched_start() and gator_timer_start()
+ if (cookies_initialize())
+ goto cookies_failure;
+ if (gator_annotate_start())
+ goto annotate_failure;
+ if (gator_trace_sched_start())
+ goto sched_failure;
+ if (gator_trace_power_start())
+ goto power_failure;
+ if (gator_trace_gpu_start())
+ goto gpu_failure;
+ if (gator_timer_start(gator_timer_count))
+ goto timer_failure;
+ if (gator_notifier_start())
+ goto notifier_failure;
+
+ return 0;
+
+notifier_failure:
+ gator_timer_stop();
+timer_failure:
+ gator_trace_gpu_stop();
+gpu_failure:
+ gator_trace_power_stop();
+power_failure:
+ gator_trace_sched_stop();
+sched_failure:
+ gator_annotate_stop();
+annotate_failure:
+ cookies_release();
+cookies_failure:
+ // stop all events
+ list_for_each_entry(gi, &gator_events, list)
+ if (gi->stop)
+ gi->stop();
+events_failure:
+ gator_migrate_stop();
+migrate_failure:
+ gator_buffer_wake_stop = true;
+ wake_up_process(gator_buffer_wake_thread);
+bwake_failure:
+
+ return -1;
+}
+
+static void gator_stop(void)
+{
+ struct gator_interface *gi;
+
+ gator_annotate_stop();
+ gator_trace_sched_stop();
+ gator_trace_power_stop();
+ gator_trace_gpu_stop();
+
+ // stop all interrupt callback reads before tearing down other interfaces
+ gator_notifier_stop(); // should be called before gator_timer_stop to avoid re-enabling the hrtimer after it has been offlined
+ gator_timer_stop();
+
+ // stop all events
+ list_for_each_entry(gi, &gator_events, list)
+ if (gi->stop)
+ gi->stop();
+
+ gator_migrate_stop();
+
+ gator_buffer_wake_stop = true;
+ wake_up_process(gator_buffer_wake_thread);
+}
+
+/******************************************************************************
+ * Filesystem
+ ******************************************************************************/
+/* fopen("buffer") */
+static int gator_op_setup(void)
+{
+ int err = 0;
+ int cpu, i;
+
+ mutex_lock(&start_mutex);
+
+ gator_buffer_size[SUMMARY_BUF] = SUMMARY_BUFFER_SIZE;
+ gator_buffer_mask[SUMMARY_BUF] = SUMMARY_BUFFER_SIZE - 1;
+
+ gator_buffer_size[BACKTRACE_BUF] = BACKTRACE_BUFFER_SIZE;
+ gator_buffer_mask[BACKTRACE_BUF] = BACKTRACE_BUFFER_SIZE - 1;
+
+ gator_buffer_size[NAME_BUF] = NAME_BUFFER_SIZE;
+ gator_buffer_mask[NAME_BUF] = NAME_BUFFER_SIZE - 1;
+
+ gator_buffer_size[COUNTER_BUF] = COUNTER_BUFFER_SIZE;
+ gator_buffer_mask[COUNTER_BUF] = COUNTER_BUFFER_SIZE - 1;
+
+ gator_buffer_size[BLOCK_COUNTER_BUF] = BLOCK_COUNTER_BUFFER_SIZE;
+ gator_buffer_mask[BLOCK_COUNTER_BUF] = BLOCK_COUNTER_BUFFER_SIZE - 1;
+
+ gator_buffer_size[ANNOTATE_BUF] = ANNOTATE_BUFFER_SIZE;
+ gator_buffer_mask[ANNOTATE_BUF] = ANNOTATE_BUFFER_SIZE - 1;
+
+ gator_buffer_size[SCHED_TRACE_BUF] = SCHED_TRACE_BUFFER_SIZE;
+ gator_buffer_mask[SCHED_TRACE_BUF] = SCHED_TRACE_BUFFER_SIZE - 1;
+
+ gator_buffer_size[GPU_TRACE_BUF] = GPU_TRACE_BUFFER_SIZE;
+ gator_buffer_mask[GPU_TRACE_BUF] = GPU_TRACE_BUFFER_SIZE - 1;
+
+ gator_buffer_size[IDLE_BUF] = IDLE_BUFFER_SIZE;
+ gator_buffer_mask[IDLE_BUF] = IDLE_BUFFER_SIZE - 1;
+
+ // Initialize percpu per buffer variables
+ for (i = 0; i < NUM_GATOR_BUFS; i++) {
+ // Verify buffers are a power of 2
+ if (gator_buffer_size[i] & (gator_buffer_size[i] - 1)) {
+ err = -ENOEXEC;
+ goto setup_error;
+ }
+
+ for_each_present_cpu(cpu) {
+ per_cpu(gator_buffer_read, cpu)[i] = 0;
+ per_cpu(gator_buffer_write, cpu)[i] = 0;
+ per_cpu(gator_buffer_commit, cpu)[i] = 0;
+ per_cpu(buffer_space_available, cpu)[i] = true;
+ per_cpu(gator_buffer_commit_time, cpu) = gator_live_rate;
+
+ // Annotation is a special case that only uses a single buffer
+ if (cpu > 0 && i == ANNOTATE_BUF) {
+ per_cpu(gator_buffer, cpu)[i] = NULL;
+ continue;
+ }
+
+ per_cpu(gator_buffer, cpu)[i] = vmalloc(gator_buffer_size[i]);
+ if (!per_cpu(gator_buffer, cpu)[i]) {
+ err = -ENOMEM;
+ goto setup_error;
+ }
+ }
+ }
+
+setup_error:
+ mutex_unlock(&start_mutex);
+ return err;
+}
+
+/* Actually start profiling (echo 1>/dev/gator/enable) */
+static int gator_op_start(void)
+{
+ int err = 0;
+
+ mutex_lock(&start_mutex);
+
+ if (gator_started || gator_start())
+ err = -EINVAL;
+ else
+ gator_started = 1;
+
+ mutex_unlock(&start_mutex);
+
+ return err;
+}
+
+/* echo 0>/dev/gator/enable */
+static void gator_op_stop(void)
+{
+ mutex_lock(&start_mutex);
+
+ if (gator_started) {
+ gator_stop();
+
+ mutex_lock(&gator_buffer_mutex);
+
+ gator_started = 0;
+ gator_monotonic_started = 0;
+ cookies_release();
+ wake_up(&gator_buffer_wait);
+
+ mutex_unlock(&gator_buffer_mutex);
+ }
+
+ mutex_unlock(&start_mutex);
+}
+
+static void gator_shutdown(void)
+{
+ int cpu, i;
+
+ mutex_lock(&start_mutex);
+
+ for_each_present_cpu(cpu) {
+ mutex_lock(&gator_buffer_mutex);
+ for (i = 0; i < NUM_GATOR_BUFS; i++) {
+ vfree(per_cpu(gator_buffer, cpu)[i]);
+ per_cpu(gator_buffer, cpu)[i] = NULL;
+ per_cpu(gator_buffer_read, cpu)[i] = 0;
+ per_cpu(gator_buffer_write, cpu)[i] = 0;
+ per_cpu(gator_buffer_commit, cpu)[i] = 0;
+ per_cpu(buffer_space_available, cpu)[i] = true;
+ per_cpu(gator_buffer_commit_time, cpu) = 0;
+ }
+ mutex_unlock(&gator_buffer_mutex);
+ }
+
+ memset(&sent_core_name, 0, sizeof(sent_core_name));
+
+ mutex_unlock(&start_mutex);
+}
+
+static int gator_set_backtrace(unsigned long val)
+{
+ int err = 0;
+
+ mutex_lock(&start_mutex);
+
+ if (gator_started)
+ err = -EBUSY;
+ else
+ gator_backtrace_depth = val;
+
+ mutex_unlock(&start_mutex);
+
+ return err;
+}
+
+static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+ return gatorfs_ulong_to_user(gator_started, buf, count, offset);
+}
+
+static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+ unsigned long val;
+ int retval;
+
+ if (*offset)
+ return -EINVAL;
+
+ retval = gatorfs_ulong_from_user(&val, buf, count);
+ if (retval)
+ return retval;
+
+ if (val)
+ retval = gator_op_start();
+ else
+ gator_op_stop();
+
+ if (retval)
+ return retval;
+ return count;
+}
+
+static const struct file_operations enable_fops = {
+ .read = enable_read,
+ .write = enable_write,
+};
+
+static int userspace_buffer_open(struct inode *inode, struct file *file)
+{
+ int err = -EPERM;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (test_and_set_bit_lock(0, &gator_buffer_opened))
+ return -EBUSY;
+
+ if ((err = gator_op_setup()))
+ goto fail;
+
+ /* NB: the actual start happens from userspace
+ * echo 1 >/dev/gator/enable
+ */
+
+ return 0;
+
+fail:
+ __clear_bit_unlock(0, &gator_buffer_opened);
+ return err;
+}
+
+static int userspace_buffer_release(struct inode *inode, struct file *file)
+{
+ gator_op_stop();
+ gator_shutdown();
+ __clear_bit_unlock(0, &gator_buffer_opened);
+ return 0;
+}
+
+static ssize_t userspace_buffer_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+ int commit, length1, length2, read;
+ char *buffer1;
+ char *buffer2;
+ int cpu, buftype;
+ int written = 0;
+
+ // ensure there is enough space for a whole frame
+ if (count < userspace_buffer_size || *offset) {
+ return -EINVAL;
+ }
+
+ // sleep until the condition is true or a signal is received
+ // the condition is checked each time gator_buffer_wait is woken up
+ wait_event_interruptible(gator_buffer_wait, buffer_commit_ready(&cpu, &buftype) || !gator_started);
+
+ if (signal_pending(current)) {
+ return -EINTR;
+ }
+
+ if (buftype == -1 || cpu == -1) {
+ return 0;
+ }
+
+ mutex_lock(&gator_buffer_mutex);
+
+ do {
+ read = per_cpu(gator_buffer_read, cpu)[buftype];
+ commit = per_cpu(gator_buffer_commit, cpu)[buftype];
+
+ // May happen if the buffer is freed during pending reads.
+ if (!per_cpu(gator_buffer, cpu)[buftype]) {
+ break;
+ }
+
+ // determine the size of two halves
+ length1 = commit - read;
+ length2 = 0;
+ buffer1 = &(per_cpu(gator_buffer, cpu)[buftype][read]);
+ buffer2 = &(per_cpu(gator_buffer, cpu)[buftype][0]);
+ if (length1 < 0) {
+ length1 = gator_buffer_size[buftype] - read;
+ length2 = commit;
+ }
+
+ if (length1 + length2 > count - written) {
+ break;
+ }
+
+ // start, middle or end
+ if (length1 > 0 && copy_to_user(&buf[written], buffer1, length1)) {
+ break;
+ }
+
+ // possible wrap around
+ if (length2 > 0 && copy_to_user(&buf[written + length1], buffer2, length2)) {
+ break;
+ }
+
+ per_cpu(gator_buffer_read, cpu)[buftype] = commit;
+ written += length1 + length2;
+
+ // Wake up annotate_write if more space is available
+ if (buftype == ANNOTATE_BUF) {
+ wake_up(&gator_annotate_wait);
+ }
+ } while (buffer_commit_ready(&cpu, &buftype));
+
+ mutex_unlock(&gator_buffer_mutex);
+
+ // kick just in case we've lost an SMP event
+ wake_up(&gator_buffer_wait);
+
+ return written > 0 ? written : -EFAULT;
+}
+
+const struct file_operations gator_event_buffer_fops = {
+ .open = userspace_buffer_open,
+ .release = userspace_buffer_release,
+ .read = userspace_buffer_read,
+};
+
+static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+ return gatorfs_ulong_to_user(gator_backtrace_depth, buf, count, offset);
+}
+
+static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
+{
+ unsigned long val;
+ int retval;
+
+ if (*offset)
+ return -EINVAL;
+
+ retval = gatorfs_ulong_from_user(&val, buf, count);
+ if (retval)
+ return retval;
+
+ retval = gator_set_backtrace(val);
+
+ if (retval)
+ return retval;
+ return count;
+}
+
+static const struct file_operations depth_fops = {
+ .read = depth_read,
+ .write = depth_write
+};
+
+void gator_op_create_files(struct super_block *sb, struct dentry *root)
+{
+ struct dentry *dir;
+ struct gator_interface *gi;
+ int cpu;
+
+ /* reinitialize default values */
+ gator_cpu_cores = 0;
+ for_each_present_cpu(cpu) {
+ gator_cpu_cores++;
+ }
+ userspace_buffer_size = BACKTRACE_BUFFER_SIZE;
+ gator_response_type = 1;
+ gator_live_rate = 0;
+
+ gatorfs_create_file(sb, root, "enable", &enable_fops);
+ gatorfs_create_file(sb, root, "buffer", &gator_event_buffer_fops);
+ gatorfs_create_file(sb, root, "backtrace_depth", &depth_fops);
+ gatorfs_create_ro_ulong(sb, root, "cpu_cores", &gator_cpu_cores);
+ gatorfs_create_ro_ulong(sb, root, "buffer_size", &userspace_buffer_size);
+ gatorfs_create_ulong(sb, root, "tick", &gator_timer_count);
+ gatorfs_create_ulong(sb, root, "response_type", &gator_response_type);
+ gatorfs_create_ro_ulong(sb, root, "version", &gator_protocol_version);
+ gatorfs_create_ro_u64(sb, root, "started", &gator_monotonic_started);
+ gatorfs_create_u64(sb, root, "live_rate", &gator_live_rate);
+
+ // Annotate interface
+ gator_annotate_create_files(sb, root);
+
+ // Linux Events
+ dir = gatorfs_mkdir(sb, root, "events");
+ list_for_each_entry(gi, &gator_events, list)
+ if (gi->create_files)
+ gi->create_files(sb, dir);
+
+ // Sched Events
+ sched_trace_create_files(sb, dir);
+
+ // Power interface
+ gator_trace_power_create_files(sb, dir);
+}
+
+/******************************************************************************
+ * Module
+ ******************************************************************************/
+static int __init gator_module_init(void)
+{
+ if (gatorfs_register()) {
+ return -1;
+ }
+
+ if (gator_init()) {
+ gatorfs_unregister();
+ return -1;
+ }
+
+ setup_timer(&gator_buffer_wake_up_timer, gator_buffer_wake_up, 0);
+
+ return 0;
+}
+
+static void __exit gator_module_exit(void)
+{
+ del_timer_sync(&gator_buffer_wake_up_timer);
+ tracepoint_synchronize_unregister();
+ gator_exit();
+ gatorfs_unregister();
+}
+
+module_init(gator_module_init);
+module_exit(gator_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ARM Ltd");
+MODULE_DESCRIPTION("Gator system profiler");
+#define STRIFY2(ARG) #ARG
+#define STRIFY(ARG) STRIFY2(ARG)
+MODULE_VERSION(STRIFY(PROTOCOL_VERSION));