1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <linux/string.h> 4 #include <linux/zalloc.h> 5 6 #include "../../util/event.h" 7 #include "../../util/synthetic-events.h" 8 #include "../../util/machine.h" 9 #include "../../util/tool.h" 10 #include "../../util/map.h" 11 #include "../../util/debug.h" 12 13 #if defined(__x86_64__) 14 15 int perf_event__synthesize_extra_kmaps(struct perf_tool *tool, 16 perf_event__handler_t process, 17 struct machine *machine) 18 { 19 int rc = 0; 20 struct map *pos; 21 struct map_groups *kmaps = &machine->kmaps; 22 struct maps *maps = &kmaps->maps; 23 union perf_event *event = zalloc(sizeof(event->mmap) + 24 machine->id_hdr_size); 25 26 if (!event) { 27 pr_debug("Not enough memory synthesizing mmap event " 28 "for extra kernel maps\n"); 29 return -1; 30 } 31 32 for (pos = maps__first(maps); pos; pos = map__next(pos)) { 33 struct kmap *kmap; 34 size_t size; 35 36 if (!__map__is_extra_kernel_map(pos)) 37 continue; 38 39 kmap = map__kmap(pos); 40 41 size = sizeof(event->mmap) - sizeof(event->mmap.filename) + 42 PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) + 43 machine->id_hdr_size; 44 45 memset(event, 0, size); 46 47 event->mmap.header.type = PERF_RECORD_MMAP; 48 49 /* 50 * kernel uses 0 for user space maps, see kernel/perf_event.c 51 * __perf_event_mmap 52 */ 53 if (machine__is_host(machine)) 54 event->header.misc = PERF_RECORD_MISC_KERNEL; 55 else 56 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 57 58 event->mmap.header.size = size; 59 60 event->mmap.start = pos->start; 61 event->mmap.len = pos->end - pos->start; 62 event->mmap.pgoff = pos->pgoff; 63 event->mmap.pid = machine->pid; 64 65 strlcpy(event->mmap.filename, kmap->name, PATH_MAX); 66 67 if (perf_tool__process_synth_event(tool, event, machine, 68 process) != 0) { 69 rc = -1; 70 break; 71 } 72 } 73 74 free(event); 75 return rc; 76 } 77 78 #endif 79