X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=wrapper%2Fvmalloc.h;h=d65a8e9c37fe85bdfcaee069f6640ee167108f0e;hb=2d0428212cbfa3f8428feee160b095f48c2ac974;hp=0c3eb86bc209d8b5ccf070bd4009a83d3d0f4ec7;hpb=9f36eaed6f91d5897924b551b44d1edd8cee00e2;p=lttng-modules.git diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h index 0c3eb86b..d65a8e9c 100644 --- a/wrapper/vmalloc.h +++ b/wrapper/vmalloc.h @@ -12,7 +12,7 @@ #ifndef _LTTNG_WRAPPER_VMALLOC_H #define _LTTNG_WRAPPER_VMALLOC_H -#include +#include #include #include @@ -20,9 +20,70 @@ #include #include +#include +#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_all(void) +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) + +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 (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); @@ -40,16 +101,65 @@ void wrapper_vmalloc_sync_all(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 wrapper_vmalloc_sync_all(void) +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_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 (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)) +#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) { @@ -61,7 +171,7 @@ void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) * Make sure we don't trigger recursive page faults in the * tracing fast path. */ - wrapper_vmalloc_sync_all(); + wrapper_vmalloc_sync_mappings(); } return ret; } @@ -102,6 +212,8 @@ void print_vmalloc_node_range_warning(void) 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. */ @@ -130,6 +242,124 @@ void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, 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. @@ -173,7 +403,7 @@ void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) * Make sure we don't trigger recursive page faults in the * tracing fast path. */ - wrapper_vmalloc_sync_all(); + wrapper_vmalloc_sync_mappings(); } return ret; }