Drop support for kernels < 3.0 from skb instrumentation

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

diff --git a/lttng-context.c b/lttng-context.c
index b625f4391de8d40d634c436ec04253b1808ab81d..869496d8ce0f222925afd2b4535ba15b2168ec87 100644 (file)
--- a/lttng-context.c
+++ b/lttng-context.c
@@ -1,32 +1,19 @@
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
  * lttng-context.c
  *
  * LTTng trace/channel/event context management.
  *
  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
-#include "wrapper/vmalloc.h"   /* for wrapper_vmalloc_sync_all() */
-#include "lttng-events.h"
-#include "lttng-tracer.h"
+#include <wrapper/vmalloc.h>   /* for wrapper_vmalloc_sync_all() */
+#include <lttng-events.h>
+#include <lttng-tracer.h>
 
 /*
  * The filter implementation requires that two consecutive "get" for the
@@ -56,14 +43,20 @@ EXPORT_SYMBOL_GPL(lttng_find_context);
 int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
 {
        unsigned int i;
+       const char *subname;
 
        if (!ctx)
                return -1;
+       if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
+               subname = name + strlen("$ctx.");
+       } else {
+               subname = name;
+       }
        for (i = 0; i < ctx->nr_fields; i++) {
                /* Skip allocated (but non-initialized) contexts */
                if (!ctx->fields[i].event_field.name)
                        continue;
-               if (!strcmp(ctx->fields[i].event_field.name, name))
+               if (!strcmp(ctx->fields[i].event_field.name, subname))
                        return i;
        }
        return -1;
@@ -89,12 +82,12 @@ struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p)
                struct lttng_ctx_field *new_fields;
 
                ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
-               new_fields = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
+               new_fields = lttng_kvzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
                if (!new_fields)
                        return NULL;
                if (ctx->fields)
                        memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
-               kfree(ctx->fields);
+               lttng_kvfree(ctx->fields);
                ctx->fields = new_fields;
        }
        field = &ctx->fields[ctx->nr_fields];
@@ -122,6 +115,7 @@ void lttng_context_update(struct lttng_ctx *ctx)
                        field_align = type->u.basic.integer.alignment;
                        break;
                case atype_array:
+               case atype_array_bitfield:
                {
                        struct lttng_basic_type *btype;
 
@@ -135,6 +129,12 @@ void lttng_context_update(struct lttng_ctx *ctx)
 
                        case atype_array:
                        case atype_sequence:
+                       case atype_array_bitfield:
+                       case atype_sequence_bitfield:
+                       case atype_struct:
+                       case atype_array_compound:
+                       case atype_sequence_compound:
+                       case atype_variant:
                        default:
                                WARN_ON_ONCE(1);
                                break;
@@ -142,6 +142,7 @@ void lttng_context_update(struct lttng_ctx *ctx)
                        break;
                }
                case atype_sequence:
+               case atype_sequence_bitfield:
                {
                        struct lttng_basic_type *btype;
 
@@ -154,6 +155,12 @@ void lttng_context_update(struct lttng_ctx *ctx)
                        case atype_string:
                        case atype_array:
                        case atype_sequence:
+                       case atype_array_bitfield:
+                       case atype_sequence_bitfield:
+                       case atype_struct:
+                       case atype_array_compound:
+                       case atype_sequence_compound:
+                       case atype_variant:
                        default:
                                WARN_ON_ONCE(1);
                                break;
@@ -172,6 +179,12 @@ void lttng_context_update(struct lttng_ctx *ctx)
 
                        case atype_array:
                        case atype_sequence:
+                       case atype_array_bitfield:
+                       case atype_sequence_bitfield:
+                       case atype_struct:
+                       case atype_array_compound:
+                       case atype_sequence_compound:
+                       case atype_variant:
                        default:
                                WARN_ON_ONCE(1);
                                break;
@@ -181,6 +194,12 @@ void lttng_context_update(struct lttng_ctx *ctx)
                case atype_string:
                        break;
 
+               case atype_struct:
+               case atype_array_compound:
+               case atype_sequence_compound:
+               case atype_variant:
+                       break;
+
                case atype_enum:
                default:
                        WARN_ON_ONCE(1);
@@ -216,7 +235,7 @@ void lttng_destroy_context(struct lttng_ctx *ctx)
                if (ctx->fields[i].destroy)
                        ctx->fields[i].destroy(&ctx->fields[i]);
        }
-       kfree(ctx->fields);
+       lttng_kvfree(ctx->fields);
        kfree(ctx);
 }
 
@@ -224,48 +243,67 @@ int lttng_context_init(void)
 {
        int ret;
 
-       ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_hostname_to_ctx");
+       }
+       ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
+       if (ret) {
+               printk(KERN_WARNING "Cannot add context lttng_add_nice_to_ctx");
        }
-#if 0  //TODO
        ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_pthread_id_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_pid_to_ctx");
        }
-       ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_ppid_to_ctx");
        }
        ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_prio_to_ctx");
        }
-       ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
        if (ret) {
                printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
        }
        ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_tid_to_ctx");
+       }
+       ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
+       if (ret) {
+               printk(KERN_WARNING "Cannot add context lttng_add_vppid_to_ctx");
        }
        ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
        }
-       ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
        }
-       ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_cpu_id_to_ctx");
        }
-       ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
+       ret = lttng_add_interruptible_to_ctx(&lttng_static_ctx);
        if (ret) {
-               printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+               printk(KERN_WARNING "Cannot add context lttng_add_interruptible_to_ctx");
+       }
+       ret = lttng_add_need_reschedule_to_ctx(&lttng_static_ctx);
+       if (ret) {
+               printk(KERN_WARNING "Cannot add context lttng_add_need_reschedule_to_ctx");
+       }
+       ret = lttng_add_preemptible_to_ctx(&lttng_static_ctx);
+       if (ret && ret != -ENOSYS) {
+               printk(KERN_WARNING "Cannot add context lttng_add_preemptible_to_ctx");
+       }
+       ret = lttng_add_migratable_to_ctx(&lttng_static_ctx);
+       if (ret && ret != -ENOSYS) {
+               printk(KERN_WARNING "Cannot add context lttng_add_migratable_to_ctx");
        }
-#endif
+       /* TODO: perf counters for filtering */
        return 0;
 }