Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/urgent

2 files changed, 113 insertions, 65 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5ddee66020a7..f0223166e761 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -234,7 +234,6 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
 
         /* Searching trace events corresponding to probe event */
         ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs);
-        close(fd);
 
         if (ntevs > 0) {        /* Succeeded to find trace events */
                 pr_debug("find %d probe_trace_events.\n", ntevs);
@@ -388,7 +387,6 @@ int show_line_range(struct line_range *lr, const char *module)
         }
 
         ret = find_line_range(fd, lr);
-        close(fd);
         if (ret == 0) {
                 pr_warning("Specified source line is not found.\n");
                 return -ENOENT;
@@ -512,19 +510,18 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
         if (ret < 0)
                 return ret;
 
-        fd = open_vmlinux(module);
-        if (fd < 0) {
-                pr_warning("Failed to open debug information file.\n");
-                return fd;
-        }
-
         setup_pager();
 
-        for (i = 0; i < npevs && ret >= 0; i++)
+        for (i = 0; i < npevs && ret >= 0; i++) {
+                fd = open_vmlinux(module);
+                if (fd < 0) {
+                        pr_warning("Failed to open debug information file.\n");
+                        ret = fd;
+                        break;
+                }
                 ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter,
                                              externs);
-
-        close(fd);
+        }
         return ret;
 }
 
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 194f9e2a3285..b7c85ce466a1 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -273,6 +273,25 @@ static const char *cu_get_comp_dir(Dwarf_Die *cu_die)
         return dwarf_formstring(&attr);
 }
 
+/* Get a line number and file name for given address */
+static int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
+                            const char **fname, int *lineno)
+{
+        Dwarf_Line *line;
+        Dwarf_Addr laddr;
+
+        line = dwarf_getsrc_die(cudie, (Dwarf_Addr)addr);
+        if (line && dwarf_lineaddr(line, &laddr) == 0 &&
+            addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
+                *fname = dwarf_linesrc(line, NULL, NULL);
+                if (!*fname)
+                        /* line number is useless without filename */
+                        *lineno = 0;
+        }
+
+        return *lineno ?: -ENOENT;
+}
+
 /* Compare diename and tname */
 static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
 {
@@ -497,7 +516,20 @@ static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
 static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
                                       Dwarf_Die *die_mem)
 {
-        return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
+        Dwarf_Die tmp_die;
+
+        sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
+        if (!sp_die)
+                return NULL;
+
+        /* Inlined function could be recursive. Trace it until fail */
+        while (sp_die) {
+                memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
+                sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
+                                        &tmp_die);
+        }
+
+        return die_mem;
 }
 
 /* Walker on lines (Note: line number will not be sorted) */
@@ -1395,6 +1427,10 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
             !die_compare_name(sp_die, pp->function))
                 return DWARF_CB_OK;
 
+        /* Check declared file */
+        if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
+                return DWARF_CB_OK;
+
         pf->fname = dwarf_decl_file(sp_die);
         if (pp->line) { /* Function relative line */
                 dwarf_decl_line(sp_die, &pf->lno);
@@ -1451,6 +1487,7 @@ static int find_probes(int fd, struct probe_finder *pf)
         if (!dbg) {
                 pr_warning("No debug information found in the vmlinux - "
                         "please rebuild with CONFIG_DEBUG_INFO=y.\n");
+                close(fd);      /* Without dwfl_end(), fd isn't closed. */
                 return -EBADF;
         }
 
@@ -1686,11 +1723,9 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
         Dwarf_Die cudie, spdie, indie;
         Dwarf *dbg = NULL;
         Dwfl *dwfl = NULL;
-        Dwarf_Line *line;
-        Dwarf_Addr laddr, eaddr, bias = 0;
-        const char *tmp;
-        int lineno, ret = 0;
-        bool found = false;
+        Dwarf_Addr _addr, baseaddr, bias = 0;
+        const char *fname = NULL, *func = NULL, *tmp;
+        int baseline = 0, lineno = 0, ret = 0;
 
         /* Open the live linux kernel */
         dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias);
@@ -1711,68 +1746,79 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
                 goto end;
         }
 
-        /* Find a corresponding line */
-        line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr);
-        if (line) {
-                if (dwarf_lineaddr(line, &laddr) == 0 &&
-                    (Dwarf_Addr)addr == laddr &&
-                    dwarf_lineno(line, &lineno) == 0) {
-                        tmp = dwarf_linesrc(line, NULL, NULL);
-                        if (tmp) {
-                                ppt->line = lineno;
-                                ppt->file = strdup(tmp);
-                                if (ppt->file == NULL) {
-                                        ret = -ENOMEM;
-                                        goto end;
-                                }
-                                found = true;
-                        }
-                }
-        }
+        /* Find a corresponding line (filename and lineno) */
+        cu_find_lineinfo(&cudie, addr, &fname, &lineno);
+        /* Don't care whether it failed or not */
 
-        /* Find a corresponding function */
+        /* Find a corresponding function (name, baseline and baseaddr) */
         if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) {
+                /* Get function entry information */
                 tmp = dwarf_diename(&spdie);
-                if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0)
-                        goto end;
-
-                if (ppt->line) {
-                        if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr,
-                                                &indie)) {
-                                /* addr in an inline function */
+                if (!tmp ||
+                    dwarf_entrypc(&spdie, &baseaddr) != 0 ||
+                    dwarf_decl_line(&spdie, &baseline) != 0)
+                        goto post;
+                func = tmp;
+
+                if (addr == (unsigned long)baseaddr)
+                        /* Function entry - Relative line number is 0 */
+                        lineno = baseline;
+                else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr,
+                                             &indie)) {
+                        if (dwarf_entrypc(&indie, &_addr) == 0 &&
+                            _addr == addr)
+                                /*
+                                 * addr is at an inline function entry.
+                                 * In this case, lineno should be the call-site
+                                 * line number.
+                                 */
+                                lineno = die_get_call_lineno(&indie);
+                        else {
+                                /*
+                                 * addr is in an inline function body.
+                                 * Since lineno points one of the lines
+                                 * of the inline function, baseline should
+                                 * be the entry line of the inline function.
+                                 */
                                 tmp = dwarf_diename(&indie);
-                                if (!tmp)
-                                        goto end;
-                                ret = dwarf_decl_line(&indie, &lineno);
-                        } else {
-                                if (eaddr == addr) {    /* Function entry */
-                                        lineno = ppt->line;
-                                        ret = 0;
-                                } else
-                                        ret = dwarf_decl_line(&spdie, &lineno);
-                        }
-                        if (ret == 0) {
-                                /* Make a relative line number */
-                                ppt->line -= lineno;
-                                goto found;
+                                if (tmp &&
+                                    dwarf_decl_line(&spdie, &baseline) == 0)
+                                        func = tmp;
                         }
                 }
-                /* We don't have a line number, let's use offset */
-                ppt->offset = addr - (unsigned long)eaddr;
-found:
-                ppt->function = strdup(tmp);
+        }
+
+post:
+        /* Make a relative line number or an offset */
+        if (lineno)
+                ppt->line = lineno - baseline;
+        else if (func)
+                ppt->offset = addr - (unsigned long)baseaddr;
+
+        /* Duplicate strings */
+        if (func) {
+                ppt->function = strdup(func);
                 if (ppt->function == NULL) {
                         ret = -ENOMEM;
                         goto end;
                 }
-                found = true;
         }
-
+        if (fname) {
+                ppt->file = strdup(fname);
+                if (ppt->file == NULL) {
+                        if (ppt->function) {
+                                free(ppt->function);
+                                ppt->function = NULL;
+                        }
+                        ret = -ENOMEM;
+                        goto end;
+                }
+        }
 end:
         if (dwfl)
                 dwfl_end(dwfl);
-        if (ret >= 0)
-                ret = found ? 1 : 0;
+        if (ret == 0 && (fname || func))
+                ret = 1;        /* Found a point */
         return ret;
 }
 
@@ -1840,6 +1886,10 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
         struct line_finder *lf = param->data;
         struct line_range *lr = lf->lr;
 
+        /* Check declared file */
+        if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
+                return DWARF_CB_OK;
+
         if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
             die_compare_name(sp_die, lr->function)) {
                 lf->fname = dwarf_decl_file(sp_die);
@@ -1892,6 +1942,7 @@ int find_line_range(int fd, struct line_range *lr)
         if (!dbg) {
                 pr_warning("No debug information found in the vmlinux - "
                         "please rebuild with CONFIG_DEBUG_INFO=y.\n");
+                close(fd);      /* Without dwfl_end(), fd isn't closed. */
                 return -EBADF;
         }