1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/types.h> 3 #include <linux/string.h> 4 #include <linux/zalloc.h> 5 #include <stdlib.h> 6 7 #include "../../../util/event.h" 8 #include "../../../util/synthetic-events.h" 9 #include "../../../util/machine.h" 10 #include "../../../util/tool.h" 11 #include "../../../util/map.h" 12 #include "../../../util/debug.h" 13 #include "util/sample.h" 14 15 #if defined(__x86_64__) 16 17 struct perf_event__synthesize_extra_kmaps_cb_args { 18 const struct perf_tool *tool; 19 perf_event__handler_t process; 20 struct machine *machine; 21 union perf_event *event; 22 }; 23 24 static int perf_event__synthesize_extra_kmaps_cb(struct map *map, void *data) 25 { 26 struct perf_event__synthesize_extra_kmaps_cb_args *args = data; 27 union perf_event *event = args->event; 28 struct kmap *kmap; 29 size_t size; 30 31 if (!__map__is_extra_kernel_map(map)) 32 return 0; 33 34 kmap = map__kmap(map); 35 36 size = sizeof(event->mmap) - sizeof(event->mmap.filename) + 37 PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) + 38 args->machine->id_hdr_size; 39 40 memset(event, 0, size); 41 42 event->mmap.header.type = PERF_RECORD_MMAP; 43 44 /* 45 * kernel uses 0 for user space maps, see kernel/perf_event.c 46 * __perf_event_mmap 47 */ 48 if (machine__is_host(args->machine)) 49 event->header.misc = PERF_RECORD_MISC_KERNEL; 50 else 51 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 52 53 event->mmap.header.size = size; 54 55 event->mmap.start = map__start(map); 56 event->mmap.len = map__size(map); 57 event->mmap.pgoff = map__pgoff(map); 58 event->mmap.pid = args->machine->pid; 59 60 strlcpy(event->mmap.filename, kmap->name, PATH_MAX); 61 62 if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0) 63 return -1; 64 65 return 0; 66 } 67 68 int perf_event__synthesize_extra_kmaps(const struct perf_tool *tool, 69 perf_event__handler_t process, 70 struct machine *machine) 71 { 72 int rc; 73 struct maps *kmaps = machine__kernel_maps(machine); 74 struct perf_event__synthesize_extra_kmaps_cb_args args = { 75 .tool = tool, 76 .process = process, 77 .machine = machine, 78 .event = zalloc(sizeof(args.event->mmap) + machine->id_hdr_size), 79 }; 80 81 if (!args.event) { 82 pr_debug("Not enough memory synthesizing mmap event " 83 "for extra kernel maps\n"); 84 return -1; 85 } 86 87 rc = maps__for_each_map(kmaps, perf_event__synthesize_extra_kmaps_cb, &args); 88 89 free(args.event); 90 return rc; 91 } 92 93 #endif 94