1 files changed, 188 insertions, 61 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index e584cd30b0f2..b939221efd8d 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -18,6 +18,7 @@
 #include <unistd.h>
 
 #include "parse-events.h"
+#include "parse-options.h"
 
 #include <sys/mman.h>
 
@@ -49,6 +50,18 @@ struct perf_evlist *perf_evlist__new(void)
         return evlist;
 }
 
+struct perf_evlist *perf_evlist__new_default(void)
+{
+        struct perf_evlist *evlist = perf_evlist__new();
+
+        if (evlist && perf_evlist__add_default(evlist)) {
+                perf_evlist__delete(evlist);
+                evlist = NULL;
+        }
+
+        return evlist;
+}
+
 /**
  * perf_evlist__set_id_pos - set the positions of event ids.
  * @evlist: selected event list
@@ -242,7 +255,7 @@ int perf_evlist__add_newtp(struct perf_evlist *evlist,
         if (evsel == NULL)
                 return -1;
 
-        evsel->handler.func = handler;
+        evsel->handler = handler;
         perf_evlist__add(evlist, evsel);
         return 0;
 }
@@ -527,7 +540,7 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
                         unsigned int offset = old;
                         unsigned int len = min(sizeof(*event), size), cpy;
-                        void *dst = &md->event_copy;
+                        void *dst = md->event_copy;
 
                         do {
                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
@@ -537,7 +550,7 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
                                 len -= cpy;
                         } while (len);
 
-                        event = &md->event_copy;
+                        event = (union perf_event *) md->event_copy;
                 }
 
                 old += size;
@@ -594,6 +607,8 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
         evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
                                       MAP_SHARED, fd, 0);
         if (evlist->mmap[idx].base == MAP_FAILED) {
+                pr_debug2("failed to mmap perf event ring buffer, error %d\n",
+                          errno);
                 evlist->mmap[idx].base = NULL;
                 return -1;
         }
@@ -602,9 +617,36 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
         return 0;
 }
 
-static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int mask)
+static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
+                                       int prot, int mask, int cpu, int thread,
+                                       int *output)
 {
         struct perf_evsel *evsel;
+
+        list_for_each_entry(evsel, &evlist->entries, node) {
+                int fd = FD(evsel, cpu, thread);
+
+                if (*output == -1) {
+                        *output = fd;
+                        if (__perf_evlist__mmap(evlist, idx, prot, mask,
+                                                *output) < 0)
+                                return -1;
+                } else {
+                        if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
+                                return -1;
+                }
+
+                if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
+                    perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
+                        return -1;
+        }
+
+        return 0;
+}
+
+static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
+                                     int mask)
+{
         int cpu, thread;
         int nr_cpus = cpu_map__nr(evlist->cpus);
         int nr_threads = thread_map__nr(evlist->threads);
@@ -614,23 +656,9 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
                 int output = -1;
 
                 for (thread = 0; thread < nr_threads; thread++) {
-                        list_for_each_entry(evsel, &evlist->entries, node) {
-                                int fd = FD(evsel, cpu, thread);
-
-                                if (output == -1) {
-                                        output = fd;
-                                        if (__perf_evlist__mmap(evlist, cpu,
-                                                                prot, mask, output) < 0)
-                                                goto out_unmap;
-                                } else {
-                                        if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
-                                                goto out_unmap;
-                                }
-
-                                if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
-                                    perf_evlist__id_add_fd(evlist, evsel, cpu, thread, fd) < 0)
-                                        goto out_unmap;
-                        }
+                        if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
+                                                        cpu, thread, &output))
+                                goto out_unmap;
                 }
         }
 
@@ -642,9 +670,9 @@ out_unmap:
         return -1;
 }
 
-static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, int mask)
+static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
+                                        int mask)
 {
-        struct perf_evsel *evsel;
         int thread;
         int nr_threads = thread_map__nr(evlist->threads);
 
@@ -652,23 +680,9 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
         for (thread = 0; thread < nr_threads; thread++) {
                 int output = -1;
 
-                list_for_each_entry(evsel, &evlist->entries, node) {
-                        int fd = FD(evsel, 0, thread);
-
-                        if (output == -1) {
-                                output = fd;
-                                if (__perf_evlist__mmap(evlist, thread,
-                                                        prot, mask, output) < 0)
-                                        goto out_unmap;
-                        } else {
-                                if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, output) != 0)
-                                        goto out_unmap;
-                        }
-
-                        if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
-                            perf_evlist__id_add_fd(evlist, evsel, 0, thread, fd) < 0)
-                                goto out_unmap;
-                }
+                if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
+                                                thread, &output))
+                        goto out_unmap;
         }
 
         return 0;
@@ -679,20 +693,76 @@ out_unmap:
         return -1;
 }
 
-/** perf_evlist__mmap - Create per cpu maps to receive events
- *
- * @evlist - list of events
- * @pages - map length in pages
- * @overwrite - overwrite older events?
- *
- * If overwrite is false the user needs to signal event consuption using:
- *
- *      struct perf_mmap *m = &evlist->mmap[cpu];
- *      unsigned int head = perf_mmap__read_head(m);
+static size_t perf_evlist__mmap_size(unsigned long pages)
+{
+        /* 512 kiB: default amount of unprivileged mlocked memory */
+        if (pages == UINT_MAX)
+                pages = (512 * 1024) / page_size;
+        else if (!is_power_of_2(pages))
+                return 0;
+
+        return (pages + 1) * page_size;
+}
+
+int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
+                                  int unset __maybe_unused)
+{
+        unsigned int *mmap_pages = opt->value;
+        unsigned long pages, val;
+        size_t size;
+        static struct parse_tag tags[] = {
+                { .tag  = 'B', .mult = 1       },
+                { .tag  = 'K', .mult = 1 << 10 },
+                { .tag  = 'M', .mult = 1 << 20 },
+                { .tag  = 'G', .mult = 1 << 30 },
+                { .tag  = 0 },
+        };
+
+        val = parse_tag_value(str, tags);
+        if (val != (unsigned long) -1) {
+                /* we got file size value */
+                pages = PERF_ALIGN(val, page_size) / page_size;
+                if (pages < (1UL << 31) && !is_power_of_2(pages)) {
+                        pages = next_pow2(pages);
+                        pr_info("rounding mmap pages size to %lu (%lu pages)\n",
+                                pages * page_size, pages);
+                }
+        } else {
+                /* we got pages count value */
+                char *eptr;
+                pages = strtoul(str, &eptr, 10);
+                if (*eptr != '\0') {
+                        pr_err("failed to parse --mmap_pages/-m value\n");
+                        return -1;
+                }
+        }
+
+        if (pages > UINT_MAX || pages > SIZE_MAX / page_size) {
+                pr_err("--mmap_pages/-m value too big\n");
+                return -1;
+        }
+
+        size = perf_evlist__mmap_size(pages);
+        if (!size) {
+                pr_err("--mmap_pages/-m value must be a power of two.");
+                return -1;
+        }
+
+        *mmap_pages = pages;
+        return 0;
+}
+
+/**
+ * perf_evlist__mmap - Create mmaps to receive events.
+ * @evlist: list of events
+ * @pages: map length in pages
+ * @overwrite: overwrite older events?
  *
- *      perf_mmap__write_tail(m, head)
+ * If @overwrite is %false the user needs to signal event consumption using
+ * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
+ * automatically.
  *
- * Using perf_evlist__read_on_cpu does this automatically.
+ * Return: %0 on success, negative error code otherwise.
  */
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
                       bool overwrite)
@@ -702,14 +772,6 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
         const struct thread_map *threads = evlist->threads;
         int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
 
-        /* 512 kiB: default amount of unprivileged mlocked memory */
-        if (pages == UINT_MAX)
-                pages = (512 * 1024) / page_size;
-        else if (!is_power_of_2(pages))
-                return -EINVAL;
-
-        mask = pages * page_size - 1;
-
         if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
                 return -ENOMEM;
 
@@ -717,7 +779,9 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
                 return -ENOMEM;
 
         evlist->overwrite = overwrite;
-        evlist->mmap_len = (pages + 1) * page_size;
+        evlist->mmap_len = perf_evlist__mmap_size(pages);
+        pr_debug("mmap size %zuB\n", evlist->mmap_len);
+        mask = evlist->mmap_len - page_size - 1;
 
         list_for_each_entry(evsel, &evlist->entries, node) {
                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
@@ -1073,3 +1137,66 @@ size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
 
         return printed + fprintf(fp, "\n");;
 }
+
+int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
+                             int err, char *buf, size_t size)
+{
+        char sbuf[128];
+
+        switch (err) {
+        case ENOENT:
+                scnprintf(buf, size, "%s",
+                          "Error:\tUnable to find debugfs\n"
+                          "Hint:\tWas your kernel was compiled with debugfs support?\n"
+                          "Hint:\tIs the debugfs filesystem mounted?\n"
+                          "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
+                break;
+        case EACCES:
+                scnprintf(buf, size,
+                          "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
+                          "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
+                          debugfs_mountpoint, debugfs_mountpoint);
+                break;
+        default:
+                scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
+                break;
+        }
+
+        return 0;
+}
+
+int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
+                               int err, char *buf, size_t size)
+{
+        int printed, value;
+        char sbuf[128], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
+
+        switch (err) {
+        case EACCES:
+        case EPERM:
+                printed = scnprintf(buf, size,
+                                    "Error:\t%s.\n"
+                                    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);
+
+                if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value))
+                        break;
+
+                printed += scnprintf(buf + printed, size - printed, "\nHint:\t");
+
+                if (value >= 2) {
+                        printed += scnprintf(buf + printed, size - printed,
+                                             "For your workloads it needs to be <= 1\nHint:\t");
+                }
+                printed += scnprintf(buf + printed, size - printed,
+                                     "For system wide tracing it needs to be set to -1");
+
+                printed += scnprintf(buf + printed, size - printed,
+                                    ".\nHint:\tThe current value is %d.", value);
+                break;
+        default:
+                scnprintf(buf, size, "%s", emsg);
+                break;
+        }
+
+        return 0;
+}