mirror of
https://github.com/tiagovignatti/intel-gpu-tools.git
synced 2026-08-19 20:33:01 +00:00
intel-gpu-tools/debugging: shader debugger
high level summary of the files:
* debug_rdata - get current state from debug registers. Helpful
when developing the debugger, and could serve some purpose in the
future.
* eudb - the debugger itself
* eviction_macro - generate the proper macro to flush the EU render
cache until I get control flow working
* pre_cpp - an evaluating c preprocesser like thing, to be used before
cpp
* sr - the system routine, exception handler which runs on the EU
* test - a very basic test system routine
* debug.h
This commit is contained in:
Ben Widawsky
+606
@@ -0,0 +1,606 @@
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/*
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* Copyright © 2011 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Ben Widawsky <ben@bwidawsk.net>
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*
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* Notes:
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*
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*/
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#include <signal.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <strings.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include "drm.h"
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#include "i915_drm.h"
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#include "drmtest.h"
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#include "intel_chipset.h"
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#include "intel_bufmgr.h"
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#include "intel_gpu_tools.h"
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#include "intel_batchbuffer.h"
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#include "intel_debug.h"
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#include "debug.h"
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#define EU_ATT 0x7810
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#define EU_ATT_CLR 0x7830
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#define RSVD_EU -1
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#define RSVD_THREAD -1
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#define RSVD_ID EUID(-1, -1, -1)
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enum {
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EBAD_SHMEM,
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EBAD_PROTOCOL,
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EBAD_MAGIC,
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EBAD_WRITE
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};
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struct debuggee {
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int euid;
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int tid;
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int fd;
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int clr;
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uint32_t reg;
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};
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struct debugger {
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struct debuggee *debuggees;
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int num_threads;
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int real_num_threads;
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int threads_per_eu;
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} *eu_info;
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drm_intel_bufmgr *bufmgr;
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struct intel_batchbuffer *batch;
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drm_intel_bo *scratch_bo;
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int handle;
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int drm_fd;
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int debug_fd = 0;
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const char *debug_file = "dump_debug.bin";
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int debug;
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int clear_waits;
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int shutting_down = 0;
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struct intel_debug_handshake dh;
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int force_clear = 0;
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uint32_t old_td_ctl;
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/*
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* The docs are wrong about the attention clear bits. The clear bits are
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* provided as part of the structure in case they change in future generations.
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*/
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#define EUID(eu, td, clear) \
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{ .euid = eu, .tid = td, .reg = EU_ATT, .fd = -1, .clr = clear }
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#define EUID2(eu, td, clear) \
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{ .euid = eu, .tid = td, .reg = EU_ATT + 4, .fd = -1, .clr = clear }
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struct debuggee gt1_debug_ids[] = {
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RSVD_ID, RSVD_ID,
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RSVD_ID, EUID(6, 3, 28), EUID(6, 2, 27), EUID(6, 1, 26), EUID(6, 0, 25),
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RSVD_ID, EUID(5, 3, 23), EUID(5, 2, 22), EUID(5, 1, 21), EUID(5, 0, 20),
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RSVD_ID, EUID(4, 3, 18), EUID(4, 2, 17), EUID(4, 1, 16), EUID(4, 0, 15),
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RSVD_ID, EUID(2, 3, 13), EUID(2, 2, 12), EUID(2, 1, 11), EUID(2, 0, 10),
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RSVD_ID, EUID(1, 3, 8), EUID(1, 2, 7), EUID(1, 1, 6), EUID(1, 0, 5),
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RSVD_ID, EUID(0, 3, 3), EUID(0, 2, 2), EUID(0, 1, 1), EUID(0, 0, 0)
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};
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struct debuggee gt2_debug_ids[] = {
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EUID(8, 1, 31), EUID(8, 0, 30),
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EUID(6, 4, 29), EUID(6, 3, 28), EUID(6, 2, 27), EUID(6, 1, 26), EUID(6, 0, 25),
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EUID(5, 4, 24), EUID(5, 3, 23), EUID(5, 2, 22), EUID(5, 1, 21), EUID(5, 0, 20),
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EUID(4, 4, 19), EUID(4, 3, 18), EUID(4, 2, 17), EUID(4, 1, 16), EUID(4, 0, 15),
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EUID(2, 4, 14), EUID(2, 3, 13), EUID(2, 2, 12), EUID(2, 1, 11), EUID(2, 0, 10),
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EUID(1, 4, 9), EUID(1, 3, 8), EUID(1, 2, 7), EUID(1, 1, 6), EUID(1, 0, 5),
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EUID(0, 4, 4), EUID(0, 3, 3), EUID(0, 2, 2), EUID(0, 1, 1), EUID(0, 0, 0),
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RSVD_ID, RSVD_ID, RSVD_ID, RSVD_ID,
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EUID2(14, 4, 27), EUID2(14, 3, 26), EUID2(14, 2, 25), EUID2(14, 1, 24), EUID2(14, 0, 23),
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EUID2(13, 4, 22), EUID2(13, 3, 21), EUID2(13, 2, 20), EUID2(13, 1, 19), EUID2(13, 0, 18),
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EUID2(12, 4, 17), EUID2(12, 3, 16), EUID2(12, 2, 15), EUID2(12, 1, 14), EUID2(12, 0, 13),
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EUID2(10, 4, 12), EUID2(10, 3, 11), EUID2(10, 2, 10), EUID2(10, 1, 9), EUID2(10, 0, 8),
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EUID2(9, 4, 7), EUID2(9, 3, 6), EUID2(9, 2, 5), EUID2(9, 1, 4), EUID2(9, 0, 3),
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EUID2(8, 4, 2), EUID2(8, 3, 1), EUID2(8, 2, 0)
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};
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struct debugger gt1 = {
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.debuggees = gt1_debug_ids,
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.num_threads = 32,
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.real_num_threads = 24,
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.threads_per_eu = 4
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};
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struct debugger gt2 = {
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.debuggees = gt2_debug_ids,
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.num_threads = 64,
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.real_num_threads = 60,
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.threads_per_eu = 5
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};
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static void
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dump_debug(void *buf, size_t count) {
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if (!debug_fd)
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debug_fd = open(debug_file, O_CREAT | O_WRONLY | O_TRUNC, S_IRWXO);
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write(debug_fd, buf, count);
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}
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static volatile void *
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map_debug_buffer(void) {
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int ret;
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ret = drm_intel_bo_map(scratch_bo, 0);
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assert(ret == 0);
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return scratch_bo->virtual;
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}
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static void
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unmap_debug_buffer(void) {
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drm_intel_bo_unmap(scratch_bo);
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}
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static int
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wait_for_attn(int timeout, int *out_bits) {
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int step = 1;
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int eus_waiting = 0;
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int i,j;
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if (timeout <= 0) {
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timeout = 1;
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step = 0;
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}
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for (i = 0; i < timeout; i += step) {
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for (j = 0; j < 8; j += 4) {
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uint32_t attn = intel_register_read(EU_ATT + j);
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if (attn) {
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int bit = 0;
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while( (bit = ffs(attn)) != 0) {
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bit--; // ffs is 1 based
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assert(bit >= 0);
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out_bits[eus_waiting] = bit + (j * 8);
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attn &= ~(1 << bit);
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eus_waiting++;
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}
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}
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}
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if (intel_register_read(EU_ATT + 8) ||
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intel_register_read(EU_ATT + 0xc)) {
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fprintf(stderr, "Unknown attention bits\n");
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}
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if (eus_waiting || shutting_down)
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break;
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}
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return eus_waiting;
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}
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#define eu_fd(bit) eu_info->debuggees[bit].fd
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#define eu_id(bit) eu_info->debuggees[bit].euid
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#define eu_tid(bit) eu_info->debuggees[bit].tid
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static struct eu_state *
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find_eu_shmem(int bit, volatile uint8_t *buf) {
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struct per_thread_data {
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uint8_t ____[dh.per_thread_scratch];
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}__attribute__((packed)) *data;
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struct eu_state *eu;
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int mem_tid, mem_euid, i;
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data = (struct per_thread_data *)buf;
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for(i = 0; i < eu_info->num_threads; i++) {
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eu = (struct eu_state *)&data[i];
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mem_tid = eu->sr0 & 0x7;
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mem_euid = (eu->sr0 >> 8) & 0xf;
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if (mem_tid == eu_tid(bit) && mem_euid == eu_id(bit))
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break;
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eu = NULL;
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}
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return eu;
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}
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#define GRF_CMP(a, b) memcmp(a, b, sizeof(grf))
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#define GRF_CPY(a, b) memcpy(a, b, sizeof(grf))
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static int
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verify(struct eu_state *eu) {
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if (GRF_CMP(eu->version, protocol_version)) {
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if (debug) {
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printf("Bad EU protocol version %x %x\n",
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((uint32_t *)&eu->version)[0],
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DEBUG_PROTOCOL_VERSION);
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dump_debug((void *)eu, sizeof(*eu));
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}
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return -EBAD_PROTOCOL;
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}
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if (GRF_CMP(eu->state_magic, eu_msg)) {
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if (debug) {
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printf("Bad EU state magic %x %x\n",
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((uint32_t *)&eu->state_magic)[0],
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((uint32_t *)&eu->state_magic)[1]);
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dump_debug((void *)eu, sizeof(*eu));
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}
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return -EBAD_MAGIC;
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} else {
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GRF_CPY(eu->state_magic, cpu_ack);
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}
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eu->sr0 = RSVD_EU << 8 | RSVD_THREAD;
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return 0;
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}
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static int
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collect_data(int bit, volatile uint8_t *buf) {
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struct eu_state *eu;
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ssize_t num;
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int ret;
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assert(eu_id(bit) != RSVD_EU);
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if (eu_fd(bit) == -1) {
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char name[128];
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sprintf(name, "dump_eu_%02d_%d.bin", eu_id(bit), eu_tid(bit));
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eu_fd(bit) = open(name, O_CREAT | O_WRONLY | O_TRUNC, S_IRWXO);
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if (eu_fd(bit) == -1)
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return -1;
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}
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eu = find_eu_shmem(bit, buf);
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if (eu == NULL) {
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if (debug)
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printf("Bad offset %d %d\n", eu_id(bit), eu_tid(bit));
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return -EBAD_SHMEM;
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}
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ret = verify(eu);
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if (ret)
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return ret;
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num = write(eu_fd(bit), (void *)eu, sizeof(*eu));
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if (num != sizeof(*eu)) {
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perror("unhandled write failure");
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return EBAD_WRITE;
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}
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return 0;
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}
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static void
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clear_attn(int bit) {
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#if 0
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/*
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* This works but doesn't allow for easily changed clearing bits
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*/
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static void
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clear_attn_old(int bit) {
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int bit_to_clear = bit % 32;
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bit_to_clear = 31 - bit_to_clear;
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intel_register_write(0x7830 + (bit/32) * 4, 0);
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intel_register_write(0x7830 + (bit/32) * 4, 1 << bit_to_clear);
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||||
}
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#else
|
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if (!force_clear) {
|
||||
int bit_to_clear;
|
||||
bit_to_clear = eu_info->debuggees[bit].clr;
|
||||
intel_register_write(EU_ATT_CLR + (bit/32) * 4, 0);
|
||||
intel_register_write(EU_ATT_CLR + (bit/32) * 4, 1 << bit_to_clear);
|
||||
} else {
|
||||
intel_register_write(EU_ATT_CLR + 0, 0);
|
||||
intel_register_write(EU_ATT_CLR + 4, 0);
|
||||
intel_register_write(EU_ATT_CLR + 0, 0xffffffff);
|
||||
intel_register_write(EU_ATT_CLR + 4, 0xffffffff);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static void
|
||||
db_shutdown(int sig) {
|
||||
shutting_down = 1;
|
||||
printf("Shutting down...\n");
|
||||
}
|
||||
|
||||
static void
|
||||
die(int reason) {
|
||||
int i = 0;
|
||||
|
||||
intel_register_write(EU_ATT_CLR, 0);
|
||||
intel_register_write(EU_ATT_CLR + 4, 0);
|
||||
|
||||
if (debug_fd)
|
||||
close(debug_fd);
|
||||
|
||||
for (i = 0; i < eu_info->num_threads; i++) {
|
||||
if (eu_info->debuggees[i].fd != -1)
|
||||
close(eu_info->debuggees[i].fd);
|
||||
}
|
||||
|
||||
unmap_debug_buffer();
|
||||
|
||||
if (old_td_ctl)
|
||||
intel_register_write(TD_CTL, old_td_ctl);
|
||||
intel_register_access_fini();
|
||||
exit(reason);
|
||||
}
|
||||
|
||||
static int
|
||||
identify_device(int devid) {
|
||||
switch(devid) {
|
||||
case PCI_CHIP_SANDYBRIDGE_GT1:
|
||||
case PCI_CHIP_SANDYBRIDGE_M_GT1:
|
||||
case PCI_CHIP_SANDYBRIDGE_S:
|
||||
eu_info = >1;
|
||||
break;
|
||||
case PCI_CHIP_SANDYBRIDGE_GT2:
|
||||
case PCI_CHIP_SANDYBRIDGE_GT2_PLUS:
|
||||
case PCI_CHIP_SANDYBRIDGE_M_GT2:
|
||||
case PCI_CHIP_SANDYBRIDGE_M_GT2_PLUS:
|
||||
eu_info = >2;
|
||||
break;
|
||||
default:
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
parse_data(const char *file_name) {
|
||||
struct eu_state *eu_state = NULL;
|
||||
struct stat st;
|
||||
int fd = -1;
|
||||
int ret, i, elements;
|
||||
|
||||
fd = open(file_name, O_RDONLY);
|
||||
if (fd == -1) {
|
||||
perror("open");
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = fstat(fd, &st);
|
||||
if (ret == -1) {
|
||||
perror("fstat");
|
||||
goto out;
|
||||
}
|
||||
|
||||
elements = st.st_size / sizeof(struct eu_state);
|
||||
if (elements == 0) {
|
||||
fprintf(stderr, "File not big enough for 1 entry\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
eu_state = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
|
||||
if (eu_state == MAP_FAILED) {
|
||||
perror("mmap");
|
||||
goto out;
|
||||
}
|
||||
|
||||
for(i = 0; i < elements; i++) {
|
||||
printf("AIP: ");
|
||||
printf("%x\n", ((uint32_t *)eu_state[i].cr0)[2]);
|
||||
}
|
||||
out:
|
||||
if (eu_state)
|
||||
munmap(eu_state, st.st_size);
|
||||
if (fd != -1)
|
||||
close(fd);
|
||||
}
|
||||
|
||||
static int
|
||||
wait_for_scratch_bo(void) {
|
||||
struct sockaddr_un addr;
|
||||
uint32_t version;
|
||||
int fd, ret, handle = -1;
|
||||
|
||||
assert(sizeof(version) == sizeof(dh.version));
|
||||
|
||||
fd = socket(AF_UNIX, SOCK_STREAM, 0);
|
||||
if (fd == -1)
|
||||
return -1;
|
||||
|
||||
/* Clean up previous runs */
|
||||
remove(SHADER_DEBUG_SOCKET);
|
||||
|
||||
memset(&addr, 0, sizeof(addr));
|
||||
addr.sun_family = AF_UNIX;
|
||||
strncpy(addr.sun_path, SHADER_DEBUG_SOCKET, sizeof(addr.sun_path) - 1);
|
||||
|
||||
ret = bind(fd, (const struct sockaddr *)&addr, sizeof(addr));
|
||||
if (ret == -1) {
|
||||
perror("listen");
|
||||
return -1;
|
||||
}
|
||||
|
||||
ret = listen(fd, 1);
|
||||
if (ret == -1) {
|
||||
perror("listen");
|
||||
goto done;
|
||||
}
|
||||
|
||||
while(1) {
|
||||
int client_fd;
|
||||
size_t count;
|
||||
char ack[] = DEBUG_HANDSHAKE_ACK;
|
||||
|
||||
client_fd = accept(fd, NULL, NULL);
|
||||
if (client_fd == -1) {
|
||||
perror("accept");
|
||||
goto done;
|
||||
}
|
||||
|
||||
count = read(client_fd, &version, sizeof(version));
|
||||
if (count != sizeof(version)) {
|
||||
perror("read version");
|
||||
goto loop_out;
|
||||
}
|
||||
|
||||
if (version != DEBUG_HANDSHAKE_VERSION) {
|
||||
fprintf(stderr, "Bad debug handshake\n");
|
||||
goto loop_out;
|
||||
}
|
||||
|
||||
count = read(client_fd, ((char *)&dh) + 1, sizeof(dh) - 1);
|
||||
if (count != sizeof(dh) - 1) {
|
||||
perror("read handshake");
|
||||
goto loop_out;
|
||||
}
|
||||
|
||||
count = write(client_fd, ack, sizeof(ack));
|
||||
if (count != sizeof(ack)) {
|
||||
perror("write ack");
|
||||
goto loop_out;
|
||||
}
|
||||
handle = dh.flink_handle;
|
||||
if (debug > 0) {
|
||||
printf("Handshake completed successfully\n"
|
||||
"\tprotocol version = %d\n"
|
||||
"\tflink handle = %d\n"
|
||||
"\tper thread scratch = %x\n", version,
|
||||
dh.flink_handle, dh.per_thread_scratch);
|
||||
}
|
||||
|
||||
loop_out:
|
||||
close(client_fd);
|
||||
break;
|
||||
}
|
||||
|
||||
done:
|
||||
close(fd);
|
||||
return handle;
|
||||
}
|
||||
|
||||
static void
|
||||
setup_hw_bits(void)
|
||||
{
|
||||
intel_register_write(INST_PM, GEN6_GLOBAL_DEBUG_ENABLE |
|
||||
GEN6_GLOBAL_DEBUG_ENABLE << 16);
|
||||
old_td_ctl = intel_register_read(GEN6_TD_CTL);
|
||||
intel_register_write(GEN6_TD_CTL, GEN6_TD_CTL_FORCE_TD_BKPT);
|
||||
}
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
struct pci_device *pci_dev;
|
||||
volatile uint8_t *scratch = NULL;
|
||||
int bits[64];
|
||||
int devid = -1, opt;
|
||||
|
||||
while ((opt = getopt(argc, argv, "cdr:pf?h")) != -1) {
|
||||
switch (opt) {
|
||||
case 'c':
|
||||
clear_waits = 1;
|
||||
break;
|
||||
case 'd':
|
||||
debug = 1;
|
||||
break;
|
||||
case 'r':
|
||||
parse_data(optarg);
|
||||
exit(0);
|
||||
break;
|
||||
case 'p':
|
||||
devid = atoi(optarg);
|
||||
break;
|
||||
case 'f':
|
||||
force_clear = 1;
|
||||
break;
|
||||
case '?':
|
||||
case 'h':
|
||||
default:
|
||||
exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
pci_dev = intel_get_pci_device();
|
||||
if (devid != -1);
|
||||
devid = pci_dev->device_id;
|
||||
if (identify_device(devid)) {
|
||||
abort();
|
||||
}
|
||||
|
||||
assert(intel_register_access_init(pci_dev, 1) == 0);
|
||||
|
||||
memset(bits, -1, sizeof(bits));
|
||||
/*
|
||||
* These events have to occur before the SR runs, or we need
|
||||
* non-blocking versions of the functions.
|
||||
*/
|
||||
if (!clear_waits) {
|
||||
int handle;
|
||||
drm_fd = drm_open_any();
|
||||
bufmgr = drm_intel_bufmgr_gem_init(drm_fd, 4096);
|
||||
|
||||
setup_hw_bits();
|
||||
|
||||
/* We are probably root, make files world friendly */
|
||||
umask(0);
|
||||
handle = wait_for_scratch_bo();
|
||||
if (handle == -1) {
|
||||
printf("No handle from mesa, please enter manually: ");
|
||||
if (fscanf(stdin, "%1d", &handle) == 0)
|
||||
exit(1);
|
||||
}
|
||||
scratch_bo = intel_bo_gem_create_from_name(bufmgr, "scratch", handle);
|
||||
if (scratch_bo == NULL) {
|
||||
fprintf(stderr, "Couldn't flink buffer\n");
|
||||
abort();
|
||||
}
|
||||
signal(SIGINT, db_shutdown);
|
||||
printf("Press Ctrl-C to stop\n");
|
||||
} else {
|
||||
int time = force_clear ? 0 : 20000;
|
||||
while (wait_for_attn(time, bits)) {
|
||||
clear_attn(bits[0]);
|
||||
memset(bits, -1, sizeof(bits));
|
||||
}
|
||||
die(0);
|
||||
}
|
||||
|
||||
scratch = map_debug_buffer();
|
||||
while (shutting_down == 0) {
|
||||
int num_events, i;
|
||||
|
||||
memset(bits, -1, sizeof(bits));
|
||||
num_events = wait_for_attn(-1, bits);
|
||||
if (num_events == 0)
|
||||
break;
|
||||
|
||||
for (i = 0; i < num_events; i++) {
|
||||
assert(bits[i] < 64 && bits[i] >= 0);
|
||||
if (collect_data(bits[i], scratch)) {
|
||||
bits[i] = -1;
|
||||
continue;
|
||||
}
|
||||
clear_attn(bits[i]);
|
||||
}
|
||||
}
|
||||
|
||||
die(0);
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user