fix: media: v4l2: abstract timeval handling in v4l2_buffer (v5.6)

[lttng-modules.git] / lttng-events.c

diff --git a/lttng-events.c b/lttng-events.c
index a3030533d1e62d1c01f4cc8b0db9fed4cffa7425..1308d949f73460e9b4fb13291828d67a7015a985 100644 (file)
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -43,6 +43,7 @@
 #include <wrapper/vzalloc.h>
 #include <wrapper/ringbuffer/backend.h>
 #include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/time.h>
 
 #define METADATA_CACHE_DEFAULT_SIZE 4096
 
@@ -76,7 +77,12 @@ int _lttng_field_statedump(struct lttng_session *session,
 
 void synchronize_trace(void)
 {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
+       synchronize_rcu();
+#else
        synchronize_sched();
+#endif
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
 #ifdef CONFIG_PREEMPT_RT_FULL
        synchronize_rcu();
@@ -749,6 +755,7 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
                 */
                event->enabled = 0;
                event->registered = 1;
+
                /*
                 * Populate lttng_event structure before event
                 * registration.
@@ -756,8 +763,7 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
                smp_wmb();
 
                ret = lttng_uprobes_register(event_param->name,
-                               event_param->u.uprobe.path,
-                               event_param->u.uprobe.offset,
+                               event_param->u.uprobe.fd,
                                event);
                if (ret)
                        goto register_error;
@@ -1136,8 +1142,8 @@ int lttng_session_list_tracker_pids(struct lttng_session *session)
                ret = PTR_ERR(tracker_pids_list_file);
                goto file_error;
        }
-       if (atomic_long_add_unless(&session->file->f_count,
-               1, INT_MAX) == INT_MAX) {
+       if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
+               ret = -EOVERFLOW;
                goto refcount_error;
        }
        ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file);
@@ -1466,6 +1472,18 @@ error_free:
        return ret;
 }
 
+int lttng_event_add_callsite(struct lttng_event *event,
+               struct lttng_kernel_event_callsite __user *callsite)
+{
+
+       switch (event->instrumentation) {
+       case LTTNG_KERNEL_UPROBE:
+               return lttng_uprobes_add_callsite(event, callsite);
+       default:
+               return -EINVAL;
+       }
+}
+
 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
                struct lttng_kernel_context *context_param)
 {
@@ -2431,6 +2449,9 @@ int _lttng_event_header_declare(struct lttng_session *session)
  * in future versions.
  * This function may return a negative offset. It may happen if the
  * system sets the REALTIME clock to 0 after boot.
+ *
+ * Use 64bit timespec on kernels that have it, this makes 32bit arch
+ * y2038 compliant.
  */
 static
 int64_t measure_clock_offset(void)
@@ -2438,13 +2459,21 @@ int64_t measure_clock_offset(void)
        uint64_t monotonic_avg, monotonic[2], realtime;
        uint64_t tcf = trace_clock_freq();
        int64_t offset;
-       struct timespec rts = { 0, 0 };
        unsigned long flags;
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+       struct timespec64 rts = { 0, 0 };
+#else
+       struct timespec rts = { 0, 0 };
+#endif
 
        /* Disable interrupts to increase correlation precision. */
        local_irq_save(flags);
        monotonic[0] = trace_clock_read64();
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+       ktime_get_real_ts64(&rts);
+#else
        getnstimeofday(&rts);
+#endif
        monotonic[1] = trace_clock_read64();
        local_irq_restore(flags);
 
@@ -2462,6 +2491,61 @@ int64_t measure_clock_offset(void)
        return offset;
 }
 
+static
+int print_escaped_ctf_string(struct lttng_session *session, const char *string)
+{
+       int ret;
+       size_t i;
+       char cur;
+
+       i = 0;
+       cur = string[i];
+       while (cur != '\0') {
+               switch (cur) {
+               case '\n':
+                       ret = lttng_metadata_printf(session, "%s", "\\n");
+                       break;
+               case '\\':
+               case '"':
+                       ret = lttng_metadata_printf(session, "%c", '\\');
+                       if (ret)
+                               goto error;
+                       /* We still print the current char */
+                       /* Fallthrough */
+               default:
+                       ret = lttng_metadata_printf(session, "%c", cur);
+                       break;
+               }
+
+               if (ret)
+                       goto error;
+
+               cur = string[++i];
+       }
+error:
+       return ret;
+}
+
+static
+int print_metadata_escaped_field(struct lttng_session *session, const char *field,
+               const char *field_value)
+{
+       int ret;
+
+       ret = lttng_metadata_printf(session, "  %s = \"", field);
+       if (ret)
+               goto error;
+
+       ret = print_escaped_ctf_string(session, field_value);
+       if (ret)
+               goto error;
+
+       ret = lttng_metadata_printf(session, "\";\n");
+
+error:
+       return ret;
+}
+
 /*
  * Output metadata into this session's metadata buffers.
  * Must be called with sessions_mutex held.
@@ -2537,7 +2621,7 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
                "       tracer_major = %d;\n"
                "       tracer_minor = %d;\n"
                "       tracer_patchlevel = %d;\n"
-               "};\n\n",
+               "       trace_buffering_scheme = \"global\";\n",
                current->nsproxy->uts_ns->name.nodename,
                utsname()->sysname,
                utsname()->release,
@@ -2549,6 +2633,19 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
        if (ret)
                goto end;
 
+       ret = print_metadata_escaped_field(session, "trace_name", session->name);
+       if (ret)
+               goto end;
+       ret = print_metadata_escaped_field(session, "trace_creation_datetime",
+                       session->creation_time);
+       if (ret)
+               goto end;
+
+       /* Close env */
+       ret = lttng_metadata_printf(session, "};\n\n");
+       if (ret)
+               goto end;
+
        ret = lttng_metadata_printf(session,
                "clock {\n"
                "       name = \"%s\";\n",