-#ifndef _LTTNG_WRAPPER_VMALLOC_H
-#define _LTTNG_WRAPPER_VMALLOC_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* wrapper/vmalloc.h
*
* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
* modules.
*
* 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
*/
+#ifndef _LTTNG_WRAPPER_VMALLOC_H
+#define _LTTNG_WRAPPER_VMALLOC_H
+
#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
+#include <lttng-kernel-version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
+/*
+ * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
+ * are now synchronized when they are created or torn down.
+ */
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
+{}
+
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
+ || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
+ || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
+ || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
+ || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
+ || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ void (*vmalloc_sync_mappings_sym)(void);
+
+ vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
+ if (vmalloc_sync_mappings_sym) {
+ vmalloc_sync_mappings_sym();
+ } else {
+#ifdef CONFIG_X86
+ /*
+ * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
+ * trigger recursive page faults.
+ */
+ printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
+#endif
+ }
+}
+
+/*
+ * Canary function to check for 'vmalloc_sync_mappings()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ * void vmalloc_sync_mappings(void);
+ */
+static inline
+void __canary__vmalloc_sync_mappings(void)
+{
+ vmalloc_sync_mappings();
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
+/*
+ * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
+ */
+static inline
+void wrapper_vmalloc_sync_mappings(void)
{
void (*vmalloc_sync_all_sym)(void);
#endif
}
}
-#else
+
+/*
+ * Canary function to check for 'vmalloc_sync_all()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ * void vmalloc_sync_all(void);
+ */
+static inline
+void __canary__vmalloc_sync_all(void)
+{
+ vmalloc_sync_all();
+}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
+#else /* CONFIG_KALLSYMS */
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
+
+/*
+ * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
+ * are now synchronized when they are created or torn down.
+ */
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{}
+
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
+ || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
+ || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
+ || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
+ || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
+ || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
+ || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
+ || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
+{
+ return vmalloc_sync_mappings();
+}
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
static inline
-void wrapper_vmalloc_sync_all(void)
+void wrapper_vmalloc_sync_mappings(void)
{
return vmalloc_sync_all();
}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
}
return ret;
}
printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
}
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
+
/*
* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
*/
return __vmalloc(size, gfp_mask, prot);
}
+/*
+ * Canary function to check for '__vmalloc_node_range()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ * extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
+ * unsigned long start, unsigned long end, gfp_t gfp_mask,
+ * pgprot_t prot, unsigned long vm_flags, int node,
+ * const void *caller);
+ */
+static inline
+void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, unsigned long vm_flags, int node,
+ const void *caller)
+{
+ return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+ vm_flags, node, caller);
+}
+
+#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)) */
+
+/*
+ * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
+ */
+static inline
+void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, unsigned long vm_flags, int node,
+ const void *caller)
+{
+#ifdef CONFIG_KALLSYMS
+ /*
+ * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
+ */
+ void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, int node, const void *caller);
+
+ lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
+ if (lttng__vmalloc_node_range)
+ return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+ node, caller);
+#endif
+ if (node != NUMA_NO_NODE)
+ print_vmalloc_node_range_warning();
+ return __vmalloc(size, gfp_mask, prot);
+}
+
+/*
+ * Canary function to check for '__vmalloc_node_range()' at compile time.
+ *
+ * From 'include/linux/vmalloc.h':
+ *
+ * extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
+ * unsigned long start, unsigned long end, gfp_t gfp_mask,
+ * pgprot_t prot, unsigned long vm_flags, int node,
+ * const void *caller);
+ */
+static inline
+void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
+ unsigned long start, unsigned long end, gfp_t gfp_mask,
+ pgprot_t prot, int node, const void *caller)
+{
+ return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+ node, caller);
+}
+
+#endif
+
/**
* lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
* failure, fall back to non-contiguous (vmalloc) allocation.
* Make sure we don't trigger recursive page faults in the
* tracing fast path.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
}
return ret;
}
projects / lttng-modules.git / blobdiff