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Date: Fri, 24 May 2019 23:16:49 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: linux-kernel@...r.kernel.org Cc: Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Masami Hiramatsu <mhiramat@...nel.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Frederic Weisbecker <frederic@...nel.org>, Joel Fernandes <joel@...lfernandes.org>, Andy Lutomirski <luto@...nel.org>, Mark Rutland <mark.rutland@....com>, Namhyung Kim <namhyung@...nel.org>, "Frank Ch. Eigler" <fche@...hat.com> Subject: [PATCH 16/16 v3] function_graph: Add selftest for passing local variables From: "Steven Rostedt (VMware)" <rostedt@...dmis.org> Add boot up selftest that passes variables from a function entry to a function exit, and make sure that they do get passed around. Also test for some failure cases. Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org> --- kernel/trace/trace_selftest.c | 310 ++++++++++++++++++++++++++++++++++ 1 file changed, 310 insertions(+) diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c index facd5d1c05e7..edee3c8bd307 100644 --- a/kernel/trace/trace_selftest.c +++ b/kernel/trace/trace_selftest.c @@ -718,6 +718,314 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) #ifdef CONFIG_FUNCTION_GRAPH_TRACER +#ifdef CONFIG_DYNAMIC_FTRACE + +#define BYTE_NUMBER 123 +#define SHORT_NUMBER 12345 +#define WORD_NUMBER 1234567890 +#define LONG_NUMBER 1234567890123456789LL + +static int fgraph_store_size __initdata; +static const char *fgraph_store_type_name __initdata; +static char *fgraph_error_str __initdata; +static char fgraph_error_str_buf[128] __initdata; + +static __init int store_entry(struct ftrace_graph_ent *trace, + struct fgraph_ops *gops) +{ + const char *type = fgraph_store_type_name; + int size = fgraph_store_size; + void *p; + void *fail; + + /* Try to reserve too much */ + fail = fgraph_reserve_data(sizeof(long) * 4 + 1); + if (fail) { + snprintf(fgraph_error_str_buf, sizeof(fgraph_error_str_buf), + "Was able to reserve too much!\n"); + fgraph_error_str = fgraph_error_str_buf; + return 0; + } + /* Reserve the amount we want to */ + p = fgraph_reserve_data(size); + if (!p) { + snprintf(fgraph_error_str_buf, sizeof(fgraph_error_str_buf), + "Failed to reserve %s\n", type); + fgraph_error_str = fgraph_error_str_buf; + return 0; + } + /* We should only be able to reserve once */ + fail = fgraph_reserve_data(4); + if (fail) { + snprintf(fgraph_error_str_buf, sizeof(fgraph_error_str_buf), + "Was able to reserve twice!\n"); + fgraph_error_str = fgraph_error_str_buf; + return 0; + } + + switch (fgraph_store_size) { + case 1: + *(char *)p = BYTE_NUMBER; + break; + case 2: + *(short *)p = SHORT_NUMBER; + break; + case 4: + *(int *)p = WORD_NUMBER; + break; + case 8: + *(long long *)p = LONG_NUMBER; + break; + case 12: + *(long long *)p = LONG_NUMBER; + p += 8; + *(int *)p = WORD_NUMBER; + break; + case 16: + *(long long *)p = LONG_NUMBER; + p += 8; + *(long long *)p = WORD_NUMBER; + *(long long *)p <<= 32; + *(long long *)p |= WORD_NUMBER; + break; + case 20: + *(long long *)p = 1; + p += 8; + *(long long *)p = 2; + p += 8; + *(int *)p = WORD_NUMBER; + break; + case 24: + *(long long *)p = 1; + p += 8; + *(long long *)p = 2; + p += 8; + *(long long *)p = LONG_NUMBER; + break; + case 28: + *(long long *)p = BYTE_NUMBER; + p += 8; + *(long long *)p = SHORT_NUMBER; + p += 8; + *(long long *)p = LONG_NUMBER; + p += 8; + *(int *)p = WORD_NUMBER; + break; + case 32: + *(long long *)p = BYTE_NUMBER; + p += 8; + *(long long *)p = SHORT_NUMBER; + p += 8; + *(long long *)p = 3; + p += 8; + *(long long *)p = LONG_NUMBER; + break; + } + + return 1; +} + +static __init void store_return(struct ftrace_graph_ret *trace, + struct fgraph_ops *gops) +{ + const char *type = fgraph_store_type_name; + long long expect[4] = { 0, 0, 0, 0}; + long long found[4] = { -1, 0, 0, 0}; + char *p; + int i; + + p = fgraph_retrieve_data(); + if (!p) { + snprintf(fgraph_error_str_buf, sizeof(fgraph_error_str_buf), + "Failed to retrieve %s\n", type); + fgraph_error_str = fgraph_error_str_buf; + return; + } + + switch (fgraph_store_size) { + case 1: + expect[0] = BYTE_NUMBER; + found[0] = *(char *)p; + break; + case 2: + expect[0] = SHORT_NUMBER; + found[0] = *(short *)p; + break; + case 4: + expect[0] = WORD_NUMBER; + found[0] = *(int *)p; + break; + case 8: + expect[0] = LONG_NUMBER; + found[0] = *(long long *)p; + break; + case 12: + expect[0] = LONG_NUMBER; + found[0] = *(long long *)p; + p += 8; + expect[1] = WORD_NUMBER; + found[1] = *(int *)p; + break; + case 16: + expect[0]= LONG_NUMBER; + found[0] = *(long long *)p; + p += 8; + found[1] = *(long long *)p; + expect[1] = WORD_NUMBER; + expect[1] <<= 32; + expect[1] |= WORD_NUMBER; + break; + case 20: + expect[0] = 1; + found[0] = *(long long *)p; + p += 8; + found[1] = *(long long *)p; + expect[1] = 2; + p += 8; + found[2] = *(int *)p; + expect[2] = WORD_NUMBER; + break; + case 24: + expect[0] = 1; + found[0] = *(long long *)p; + p += 8; + found[1] = *(long long *)p; + expect[1] = 2; + p += 8; + found[2] = *(long long *)p; + expect[2] = LONG_NUMBER; + break; + case 28: + found[0] = *(long long *)p; + expect[0] = BYTE_NUMBER; + p += 8; + found[1] = *(long long *)p; + expect[1] = SHORT_NUMBER; + p += 8; + found[2] = *(long long *)p; + expect[2] = LONG_NUMBER; + p += 8; + found[3] = *(int *)p; + expect[3] = WORD_NUMBER; + break; + case 32: + found[0] = *(long long *)p; + expect[0] = BYTE_NUMBER; + p += 8; + found[1] = *(long long *)p; + expect[1] = SHORT_NUMBER; + p += 8; + found[2] = *(long long *)p; + expect[2] = 3; + p += 8; + found[3] = *(long long *)p; + expect[3] = LONG_NUMBER; + break; + } + + for (i = 0; i < 4; i++) { + if (found[i] != expect[i]) { + snprintf(fgraph_error_str_buf, + sizeof(fgraph_error_str_buf), + "%s [word %d] returned not %lld but %lld\n", + type, i, expect[i], found[i]); + fgraph_error_str = fgraph_error_str_buf; + return; + } + } + fgraph_error_str = NULL; +} + +static struct fgraph_ops store_bytes __initdata = { + .entryfunc = store_entry, + .retfunc = store_return, +}; + +static int __init test_graph_storage_type(const char *name, int size) +{ + char *func_name; + int len; + int ret; + + fgraph_store_type_name = name; + fgraph_store_size = size; + + snprintf(fgraph_error_str_buf, sizeof(fgraph_error_str_buf), + "Failed to execute storage %s\n", name); + fgraph_error_str = fgraph_error_str_buf; + + printk(KERN_CONT "PASSED\n"); + pr_info("Testing fgraph storage of %d byte%s: ", size, size > 1 ? "s" : ""); + + func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); + len = strlen(func_name); + + ret = ftrace_set_filter(&store_bytes.ops, func_name, len, 1); + if (ret && ret != -ENODEV) { + pr_cont("*Could not set filter* "); + return -1; + } + + ret = register_ftrace_graph(&store_bytes); + if (ret) { + printk(KERN_WARNING "Failed to init store_bytes fgraph tracing\n"); + return -1; + } + + DYN_FTRACE_TEST_NAME(); + + unregister_ftrace_graph(&store_bytes); + + if (fgraph_error_str) { + printk(KERN_CONT "*** %s ***", fgraph_error_str); + return -1; + } + + return 0; +} +/* Test the storage passed across function_graph entry and return */ +static __init int test_graph_storage(void) +{ + int ret; + + ret = test_graph_storage_type("byte", 1); + if (ret) + return ret; + ret = test_graph_storage_type("short", 2); + if (ret) + return ret; + ret = test_graph_storage_type("word", 4); + if (ret) + return ret; + ret = test_graph_storage_type("long long", 8); + if (ret) + return ret; + ret = test_graph_storage_type("12 bytes", 12); + if (ret) + return ret; + ret = test_graph_storage_type("16 bytes", 16); + if (ret) + return ret; +#if BITS_PER_LONG == 64 + ret = test_graph_storage_type("20 bytes", 20); + if (ret) + return ret; + ret = test_graph_storage_type("24 bytes", 24); + if (ret) + return ret; + ret = test_graph_storage_type("28 bytes", 28); + if (ret) + return ret; + ret = test_graph_storage_type("32 bytes", 32); + if (ret) + return ret; +#endif + return 0; +} +#else +static inline int test_graph_storage(void) { return 0; } +#endif /* CONFIG_DYNAMIC_FTRACE */ + /* Maximum number of functions to trace before diagnosing a hang */ #define GRAPH_MAX_FUNC_TEST 100000000 @@ -805,6 +1113,8 @@ trace_selftest_startup_function_graph(struct tracer *trace, goto out; } + ret = test_graph_storage(); + /* Don't test dynamic tracing, the function tracer already did */ out: -- 2.20.1
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