-#ifndef _LTTNG_WRAPPER_VMALLOC_H
-#define _LTTNG_WRAPPER_VMALLOC_H
-
-/*
- * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+/* 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
* available, else we need to have a kernel that exports this function to GPL
* modules.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
+#ifndef _LTTNG_WRAPPER_VMALLOC_H
+#define _LTTNG_WRAPPER_VMALLOC_H
+
+#include <lttng-kernel-version.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
-#include "kallsyms.h"
+#include <wrapper/kallsyms.h>
+#include <lttng-kernel-version.h>
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_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 (LTTNG_LINUX_VERSION_CODE >= LTTNG_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) \
+ || LTTNG_RHEL_KERNEL_RANGE(4,18,0,240,0,0, 4,19,0,0,0,0))
+
+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 wrapper_vmalloc_sync_all(void)
+void __canary__vmalloc_sync_mappings(void)
+{
+ vmalloc_sync_mappings();
+}
+
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_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);
* Only x86 needs vmalloc_sync_all to make sure LTTng does not
* trigger recursive page faults.
*/
- printk(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
- printk(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
+ printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
}
}
-#else
-#include <linux/vmalloc.h>
+/*
+ * 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 (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */
+
+#else /* CONFIG_KALLSYMS */
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_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 (LTTNG_LINUX_VERSION_CODE >= LTTNG_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_all(void)
+void wrapper_vmalloc_sync_mappings(void)
+{
+ return vmalloc_sync_mappings();
+}
+
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */
+
+static inline
+void wrapper_vmalloc_sync_mappings(void)
{
return vmalloc_sync_all();
}
+
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */
+
+#endif
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,12,0))
+static inline
+void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ void *ret;
+
+ ret = kvmalloc_node(size, flags, node);
+ if (is_vmalloc_addr(ret)) {
+ /*
+ * Make sure we don't trigger recursive page faults in the
+ * tracing fast path.
+ */
+ wrapper_vmalloc_sync_mappings();
+ }
+ return ret;
+}
+
+static inline
+void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
+}
+
+static inline
+void *lttng_kvmalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void *lttng_kvzalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void lttng_kvfree(const void *addr)
+{
+ kvfree(addr);
+}
+
+#else
+
+#include <linux/slab.h>
+
+static inline
+void print_vmalloc_node_range_warning(void)
+{
+ printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
+ printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
+ printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
+}
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_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, unsigned long vm_flags, 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,
+ vm_flags, 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, unsigned long vm_flags, int node,
+ const void *caller)
+{
+ return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
+ vm_flags, node, caller);
+}
+
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0))
+
+/*
+ * 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);
+}
+
+#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0)) */
+
+/*
+ * 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,
+ 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, 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,
+ * 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, 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.
+ * @size: size of the request.
+ * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
+ *
+ * Uses kmalloc to get the memory but if the allocation fails then falls back
+ * to the vmalloc allocator. Use lttng_kvfree to free the memory.
+ *
+ * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
+ */
+static inline
+void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ void *ret;
+
+ /*
+ * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
+ * so the given set of flags has to be compatible.
+ */
+ WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);
+
+ /*
+ * If the allocation fits in a single page, do not fallback.
+ */
+ if (size <= PAGE_SIZE) {
+ return kmalloc_node(size, flags, node);
+ }
+
+ /*
+ * Make sure that larger requests are not too disruptive - no OOM
+ * killer and no allocation failure warnings as we have a fallback
+ */
+ ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node);
+ if (!ret) {
+ ret = __lttng_vmalloc_node_range(size, 1,
+ VMALLOC_START, VMALLOC_END,
+ flags | __GFP_HIGHMEM, PAGE_KERNEL, 0,
+ node, __builtin_return_address(0));
+ /*
+ * Make sure we don't trigger recursive page faults in the
+ * tracing fast path.
+ */
+ wrapper_vmalloc_sync_mappings();
+ }
+ return ret;
+}
+
+static inline
+void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
+{
+ return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
+}
+
+static inline
+void *lttng_kvmalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void *lttng_kvzalloc(unsigned long size, gfp_t flags)
+{
+ return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
+}
+
+static inline
+void lttng_kvfree(const void *addr)
+{
+ if (is_vmalloc_addr(addr)) {
+ vfree(addr);
+ } else {
+ kfree(addr);
+ }
+}
#endif
#endif /* _LTTNG_WRAPPER_VMALLOC_H */
projects / lttng-modules.git / blobdiff