| /* |
| * Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org> |
| * |
| * How vectorised is this code? |
| * |
| * Attempt to measure the amount of vectorisation that has been done |
| * on some code by counting classes of instruction. |
| * |
| * License: GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| */ |
| #include <inttypes.h> |
| #include <assert.h> |
| #include <stdlib.h> |
| #include <inttypes.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <glib.h> |
| |
| #include <qemu-plugin.h> |
| |
| QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; |
| |
| #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
| |
| typedef enum { |
| COUNT_CLASS, |
| COUNT_INDIVIDUAL, |
| COUNT_NONE |
| } CountType; |
| |
| static int limit = 50; |
| static bool do_inline; |
| static bool verbose; |
| |
| static GMutex lock; |
| static GHashTable *insns; |
| |
| typedef struct { |
| const char *class; |
| const char *opt; |
| uint32_t mask; |
| uint32_t pattern; |
| CountType what; |
| uint64_t count; |
| } InsnClassExecCount; |
| |
| typedef struct { |
| char *insn; |
| uint32_t opcode; |
| uint64_t count; |
| InsnClassExecCount *class; |
| } InsnExecCount; |
| |
| /* |
| * Matchers for classes of instructions, order is important. |
| * |
| * Your most precise match must be before looser matches. If no match |
| * is found in the table we can create an individual entry. |
| * |
| * 31..28 27..24 23..20 19..16 15..12 11..8 7..4 3..0 |
| */ |
| static InsnClassExecCount aarch64_insn_classes[] = { |
| /* "Reserved"" */ |
| { " UDEF", "udef", 0xffff0000, 0x00000000, COUNT_NONE}, |
| { " SVE", "sve", 0x1e000000, 0x04000000, COUNT_CLASS}, |
| { "Reserved", "res", 0x1e000000, 0x00000000, COUNT_CLASS}, |
| /* Data Processing Immediate */ |
| { " PCrel addr", "pcrel", 0x1f000000, 0x10000000, COUNT_CLASS}, |
| { " Add/Sub (imm,tags)","asit", 0x1f800000, 0x11800000, COUNT_CLASS}, |
| { " Add/Sub (imm)", "asi", 0x1f000000, 0x11000000, COUNT_CLASS}, |
| { " Logical (imm)", "logi", 0x1f800000, 0x12000000, COUNT_CLASS}, |
| { " Move Wide (imm)", "movwi", 0x1f800000, 0x12800000, COUNT_CLASS}, |
| { " Bitfield", "bitf", 0x1f800000, 0x13000000, COUNT_CLASS}, |
| { " Extract", "extr", 0x1f800000, 0x13800000, COUNT_CLASS}, |
| { "Data Proc Imm", "dpri", 0x1c000000, 0x10000000, COUNT_CLASS}, |
| /* Branches */ |
| { " Cond Branch (imm)", "cndb", 0xfe000000, 0x54000000, COUNT_CLASS}, |
| { " Exception Gen", "excp", 0xff000000, 0xd4000000, COUNT_CLASS}, |
| { " NOP", "nop", 0xffffffff, 0xd503201f, COUNT_NONE}, |
| { " Hints", "hint", 0xfffff000, 0xd5032000, COUNT_CLASS}, |
| { " Barriers", "barr", 0xfffff000, 0xd5033000, COUNT_CLASS}, |
| { " PSTATE", "psta", 0xfff8f000, 0xd5004000, COUNT_CLASS}, |
| { " System Insn", "sins", 0xffd80000, 0xd5080000, COUNT_CLASS}, |
| { " System Reg", "sreg", 0xffd00000, 0xd5100000, COUNT_CLASS}, |
| { " Branch (reg)", "breg", 0xfe000000, 0xd6000000, COUNT_CLASS}, |
| { " Branch (imm)", "bimm", 0x7c000000, 0x14000000, COUNT_CLASS}, |
| { " Cmp & Branch", "cmpb", 0x7e000000, 0x34000000, COUNT_CLASS}, |
| { " Tst & Branch", "tstb", 0x7e000000, 0x36000000, COUNT_CLASS}, |
| { "Branches", "branch", 0x1c000000, 0x14000000, COUNT_CLASS}, |
| /* Loads and Stores */ |
| { " AdvSimd ldstmult", "advlsm", 0xbfbf0000, 0x0c000000, COUNT_CLASS}, |
| { " AdvSimd ldstmult++","advlsmp",0xbfb00000, 0x0c800000, COUNT_CLASS}, |
| { " AdvSimd ldst", "advlss", 0xbf9f0000, 0x0d000000, COUNT_CLASS}, |
| { " AdvSimd ldst++", "advlssp",0xbf800000, 0x0d800000, COUNT_CLASS}, |
| { " ldst excl", "ldstx", 0x3f000000, 0x08000000, COUNT_CLASS}, |
| { " Prefetch", "prfm", 0xff000000, 0xd8000000, COUNT_CLASS}, |
| { " Load Reg (lit)", "ldlit", 0x1b000000, 0x18000000, COUNT_CLASS}, |
| { " ldst noalloc pair", "ldstnap",0x3b800000, 0x28000000, COUNT_CLASS}, |
| { " ldst pair", "ldstp", 0x38000000, 0x28000000, COUNT_CLASS}, |
| { " ldst reg", "ldstr", 0x3b200000, 0x38000000, COUNT_CLASS}, |
| { " Atomic ldst", "atomic", 0x3b200c00, 0x38200000, COUNT_CLASS}, |
| { " ldst reg (reg off)","ldstro", 0x3b200b00, 0x38200800, COUNT_CLASS}, |
| { " ldst reg (pac)", "ldstpa", 0x3b200200, 0x38200800, COUNT_CLASS}, |
| { " ldst reg (imm)", "ldsti", 0x3b000000, 0x39000000, COUNT_CLASS}, |
| { "Loads & Stores", "ldst", 0x0a000000, 0x08000000, COUNT_CLASS}, |
| /* Data Processing Register */ |
| { "Data Proc Reg", "dprr", 0x0e000000, 0x0a000000, COUNT_CLASS}, |
| /* Scalar FP */ |
| { "Scalar FP ", "fpsimd", 0x0e000000, 0x0e000000, COUNT_CLASS}, |
| /* Unclassified */ |
| { "Unclassified", "unclas", 0x00000000, 0x00000000, COUNT_CLASS}, |
| }; |
| |
| static InsnClassExecCount sparc32_insn_classes[] = { |
| { "Call", "call", 0xc0000000, 0x40000000, COUNT_CLASS}, |
| { "Branch ICond", "bcc", 0xc1c00000, 0x00800000, COUNT_CLASS}, |
| { "Branch Fcond", "fbcc", 0xc1c00000, 0x01800000, COUNT_CLASS}, |
| { "SetHi", "sethi", 0xc1c00000, 0x01000000, COUNT_CLASS}, |
| { "FPU ALU", "fpu", 0xc1f00000, 0x81a00000, COUNT_CLASS}, |
| { "ALU", "alu", 0xc0000000, 0x80000000, COUNT_CLASS}, |
| { "Load/Store", "ldst", 0xc0000000, 0xc0000000, COUNT_CLASS}, |
| /* Unclassified */ |
| { "Unclassified", "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL}, |
| }; |
| |
| static InsnClassExecCount sparc64_insn_classes[] = { |
| { "SetHi & Branches", "op0", 0xc0000000, 0x00000000, COUNT_CLASS}, |
| { "Call", "op1", 0xc0000000, 0x40000000, COUNT_CLASS}, |
| { "Arith/Logical/Move", "op2", 0xc0000000, 0x80000000, COUNT_CLASS}, |
| { "Arith/Logical/Move", "op3", 0xc0000000, 0xc0000000, COUNT_CLASS}, |
| /* Unclassified */ |
| { "Unclassified", "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL}, |
| }; |
| |
| /* Default matcher for currently unclassified architectures */ |
| static InsnClassExecCount default_insn_classes[] = { |
| { "Unclassified", "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL}, |
| }; |
| |
| typedef struct { |
| const char *qemu_target; |
| InsnClassExecCount *table; |
| int table_sz; |
| } ClassSelector; |
| |
| static ClassSelector class_tables[] = |
| { |
| { "aarch64", aarch64_insn_classes, ARRAY_SIZE(aarch64_insn_classes) }, |
| { "sparc", sparc32_insn_classes, ARRAY_SIZE(sparc32_insn_classes) }, |
| { "sparc64", sparc64_insn_classes, ARRAY_SIZE(sparc64_insn_classes) }, |
| { NULL, default_insn_classes, ARRAY_SIZE(default_insn_classes) }, |
| }; |
| |
| static InsnClassExecCount *class_table; |
| static int class_table_sz; |
| |
| static gint cmp_exec_count(gconstpointer a, gconstpointer b) |
| { |
| InsnExecCount *ea = (InsnExecCount *) a; |
| InsnExecCount *eb = (InsnExecCount *) b; |
| return ea->count > eb->count ? -1 : 1; |
| } |
| |
| static void free_record(gpointer data) |
| { |
| InsnExecCount *rec = (InsnExecCount *) data; |
| g_free(rec->insn); |
| g_free(rec); |
| } |
| |
| static void plugin_exit(qemu_plugin_id_t id, void *p) |
| { |
| g_autoptr(GString) report = g_string_new("Instruction Classes:\n"); |
| int i; |
| GList *counts; |
| InsnClassExecCount *class = NULL; |
| |
| for (i = 0; i < class_table_sz; i++) { |
| class = &class_table[i]; |
| switch (class->what) { |
| case COUNT_CLASS: |
| if (class->count || verbose) { |
| g_string_append_printf(report, "Class: %-24s\t(%ld hits)\n", |
| class->class, |
| class->count); |
| } |
| break; |
| case COUNT_INDIVIDUAL: |
| g_string_append_printf(report, "Class: %-24s\tcounted individually\n", |
| class->class); |
| break; |
| case COUNT_NONE: |
| g_string_append_printf(report, "Class: %-24s\tnot counted\n", |
| class->class); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| counts = g_hash_table_get_values(insns); |
| if (counts && g_list_next(counts)) { |
| g_string_append_printf(report,"Individual Instructions:\n"); |
| counts = g_list_sort(counts, cmp_exec_count); |
| |
| for (i = 0; i < limit && g_list_next(counts); |
| i++, counts = g_list_next(counts)) { |
| InsnExecCount *rec = (InsnExecCount *) counts->data; |
| g_string_append_printf(report, |
| "Instr: %-24s\t(%ld hits)\t(op=%#08x/%s)\n", |
| rec->insn, |
| rec->count, |
| rec->opcode, |
| rec->class ? |
| rec->class->class : "un-categorised"); |
| } |
| g_list_free(counts); |
| } |
| |
| g_hash_table_destroy(insns); |
| |
| qemu_plugin_outs(report->str); |
| } |
| |
| static void plugin_init(void) |
| { |
| insns = g_hash_table_new_full(NULL, g_direct_equal, NULL, &free_record); |
| } |
| |
| static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata) |
| { |
| uint64_t *count = (uint64_t *) udata; |
| (*count)++; |
| } |
| |
| static uint64_t * find_counter(struct qemu_plugin_insn *insn) |
| { |
| int i; |
| uint64_t *cnt = NULL; |
| uint32_t opcode; |
| InsnClassExecCount *class = NULL; |
| |
| /* |
| * We only match the first 32 bits of the instruction which is |
| * fine for most RISCs but a bit limiting for CISC architectures. |
| * They would probably benefit from a more tailored plugin. |
| * However we can fall back to individual instruction counting. |
| */ |
| opcode = *((uint32_t *)qemu_plugin_insn_data(insn)); |
| |
| for (i = 0; !cnt && i < class_table_sz; i++) { |
| class = &class_table[i]; |
| uint32_t masked_bits = opcode & class->mask; |
| if (masked_bits == class->pattern) { |
| break; |
| } |
| } |
| |
| g_assert(class); |
| |
| switch (class->what) { |
| case COUNT_NONE: |
| return NULL; |
| case COUNT_CLASS: |
| return &class->count; |
| case COUNT_INDIVIDUAL: |
| { |
| InsnExecCount *icount; |
| |
| g_mutex_lock(&lock); |
| icount = (InsnExecCount *) g_hash_table_lookup(insns, |
| GUINT_TO_POINTER(opcode)); |
| |
| if (!icount) { |
| icount = g_new0(InsnExecCount, 1); |
| icount->opcode = opcode; |
| icount->insn = qemu_plugin_insn_disas(insn); |
| icount->class = class; |
| |
| g_hash_table_insert(insns, GUINT_TO_POINTER(opcode), |
| (gpointer) icount); |
| } |
| g_mutex_unlock(&lock); |
| |
| return &icount->count; |
| } |
| default: |
| g_assert_not_reached(); |
| } |
| |
| return NULL; |
| } |
| |
| static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb) |
| { |
| size_t n = qemu_plugin_tb_n_insns(tb); |
| size_t i; |
| |
| for (i = 0; i < n; i++) { |
| uint64_t *cnt; |
| struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i); |
| cnt = find_counter(insn); |
| |
| if (cnt) { |
| if (do_inline) { |
| qemu_plugin_register_vcpu_insn_exec_inline( |
| insn, QEMU_PLUGIN_INLINE_ADD_U64, cnt, 1); |
| } else { |
| qemu_plugin_register_vcpu_insn_exec_cb( |
| insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, cnt); |
| } |
| } |
| } |
| } |
| |
| QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, |
| const qemu_info_t *info, |
| int argc, char **argv) |
| { |
| int i; |
| |
| /* Select a class table appropriate to the guest architecture */ |
| for (i = 0; i < ARRAY_SIZE(class_tables); i++) { |
| ClassSelector *entry = &class_tables[i]; |
| if (!entry->qemu_target || |
| strcmp(entry->qemu_target, info->target_name) == 0) { |
| class_table = entry->table; |
| class_table_sz = entry->table_sz; |
| break; |
| } |
| } |
| |
| for (i = 0; i < argc; i++) { |
| char *p = argv[i]; |
| if (strcmp(p, "inline") == 0) { |
| do_inline = true; |
| } else if (strcmp(p, "verbose") == 0) { |
| verbose = true; |
| } else { |
| int j; |
| CountType type = COUNT_INDIVIDUAL; |
| if (*p == '!') { |
| type = COUNT_NONE; |
| p++; |
| } |
| for (j = 0; j < class_table_sz; j++) { |
| if (strcmp(p, class_table[j].opt) == 0) { |
| class_table[j].what = type; |
| break; |
| } |
| } |
| } |
| } |
| |
| plugin_init(); |
| |
| qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); |
| qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); |
| return 0; |
| } |
