1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved. 4 * 5 * Not a Contribution, Apache license notifications and license are 6 * retained for attribution purposes only. 7 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 #include <cutils/properties.h> 22 #include <utils/Log.h> 23 #include <fcntl.h> 24 #include <sys/ioctl.h> 25 #include <linux/msm_mdp.h> 26 #include <sys/resource.h> 27 #include <sys/prctl.h> 28 #include <poll.h> 29 #include "hwc_utils.h" 30 #include "string.h" 31 #include "external.h" 32 #include "overlay.h" 33 #define __STDC_FORMAT_MACROS 1 34 #include <inttypes.h> 35 36 namespace qhwc { 37 38 #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread" 39 #define MAX_SYSFS_FILE_PATH 255 40 #define PANEL_ON_STR "panel_power_on =" 41 #define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0])) 42 const int MAX_DATA = 64; 43 bool logvsync = false; 44 45 int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable) 46 { 47 int ret = 0; 48 if(!ctx->vstate.fakevsync && 49 ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL, 50 &enable) < 0) { 51 ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s", 52 __FUNCTION__, dpy, enable, strerror(errno)); 53 ret = -errno; 54 } 55 return ret; 56 } 57 58 static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data) 59 { 60 // extract timestamp 61 uint64_t timestamp = 0; 62 if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) { 63 timestamp = strtoull(data + strlen("VSYNC="), NULL, 0); 64 } 65 // send timestamp to SurfaceFlinger 66 ALOGD_IF (logvsync, "%s: timestamp %"PRIu64" sent to SF for dpy=%d", 67 __FUNCTION__, timestamp, dpy); 68 ctx->proc->vsync(ctx->proc, dpy, timestamp); 69 } 70 71 static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data) 72 { 73 if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) { 74 uint32_t poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0); 75 ALOGI("%s: dpy:%d panel power state: %d", __FUNCTION__, dpy, poweron); 76 ctx->dpyAttr[dpy].isActive = poweron ? true: false; 77 } 78 } 79 80 struct event { 81 const char* name; 82 void (*callback)(hwc_context_t* ctx, int dpy, char *data); 83 }; 84 85 struct event event_list[] = { 86 { "vsync_event", handle_vsync_event }, 87 { "show_blank_event", handle_blank_event }, 88 }; 89 90 #define num_events ARRAY_LENGTH(event_list) 91 #define VSYNC_FAILURE_THRESHOLD 2 92 93 static void *vsync_loop(void *param) 94 { 95 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param); 96 97 char thread_name[64] = HWC_VSYNC_THREAD_NAME; 98 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0); 99 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY + 100 android::PRIORITY_MORE_FAVORABLE); 101 102 char vdata[MAX_DATA]; 103 //Number of physical displays 104 //We poll on all the nodes. 105 int num_displays = HWC_NUM_DISPLAY_TYPES - 1; 106 struct pollfd pfd[num_displays][num_events]; 107 108 char property[PROPERTY_VALUE_MAX]; 109 if(property_get("debug.hwc.fakevsync", property, NULL) > 0) { 110 if(atoi(property) == 1) 111 ctx->vstate.fakevsync = true; 112 } 113 114 if(property_get("debug.hwc.logvsync", property, 0) > 0) { 115 if(atoi(property) == 1) 116 logvsync = true; 117 } 118 119 char node_path[MAX_SYSFS_FILE_PATH]; 120 #ifdef VSYNC_FAILURE_FALLBACK 121 int fake_vsync_switch_cnt = 0; 122 #endif 123 124 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { 125 for(size_t ev = 0; ev < num_events; ev++) { 126 snprintf(node_path, sizeof(node_path), 127 "/sys/class/graphics/fb%d/%s", 128 dpy == HWC_DISPLAY_PRIMARY ? 0 : 129 overlay::Overlay::getInstance()-> 130 getFbForDpy(HWC_DISPLAY_EXTERNAL), 131 event_list[ev].name); 132 133 ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__, 134 ev, dpy, node_path); 135 pfd[dpy][ev].fd = open(node_path, O_RDONLY); 136 137 if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) { 138 // Make sure fb device is opened before starting 139 // this thread so this never happens. 140 ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s", 141 __FUNCTION__, dpy, ev, strerror(errno)); 142 if (ev == 0) { 143 ctx->vstate.fakevsync = true; 144 //XXX: Blank events don't work with fake vsync, 145 //but we shouldn't be running on fake vsync anyway. 146 break; 147 } 148 } 149 150 pread(pfd[dpy][ev].fd, vdata , MAX_DATA, 0); 151 if (pfd[dpy][ev].fd >= 0) 152 pfd[dpy][ev].events = POLLPRI | POLLERR; 153 } 154 } 155 156 if (LIKELY(!ctx->vstate.fakevsync)) { 157 do { 158 int err = poll(*pfd, num_displays * num_events, -1); 159 if(err > 0) { 160 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { 161 for(size_t ev = 0; ev < num_events; ev++) { 162 if (pfd[dpy][ev].revents & POLLPRI) { 163 err = pread(pfd[dpy][ev].fd, vdata, MAX_DATA, 0); 164 if (UNLIKELY(err < 0)) { 165 // If the read was just interrupted - it is not 166 // a fatal error. Just continue in this case 167 ALOGE ("%s: Unable to read event:%zu for \ 168 dpy=%d : %s", 169 __FUNCTION__, ev, dpy, strerror(errno)); 170 #ifdef VSYNC_FAILURE_FALLBACK 171 fake_vsync_switch_cnt++; 172 if (fake_vsync_switch_cnt > 173 VSYNC_FAILURE_THRESHOLD) { 174 ALOGE("%s: Too many errors, falling back to fake vsync ", 175 __FUNCTION__); 176 ctx->vstate.fakevsync = true; 177 goto vsync_failed; 178 } 179 #endif 180 continue; 181 } 182 event_list[ev].callback(ctx, dpy, vdata); 183 } 184 } 185 } 186 } else { 187 ALOGE("%s: poll failed errno: %s", __FUNCTION__, 188 strerror(errno)); 189 continue; 190 } 191 } while (true); 192 193 } else { 194 195 #ifdef VSYNC_FAILURE_FALLBACK 196 vsync_failed: 197 #endif 198 //Fake vsync is used only when set explicitly through a property or when 199 //the vsync timestamp node cannot be opened at bootup. There is no 200 //fallback to fake vsync from the true vsync loop, ever, as the 201 //condition can easily escape detection. 202 //Also, fake vsync is delivered only for the primary display. 203 do { 204 usleep(16666); 205 uint64_t timestamp = systemTime(); 206 ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp); 207 208 } while (true); 209 } 210 211 for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) { 212 for( size_t event = 0; event < num_events; event++) { 213 if(pfd[dpy][event].fd >= 0) 214 close (pfd[dpy][event].fd); 215 } 216 } 217 218 return NULL; 219 } 220 221 void init_vsync_thread(hwc_context_t* ctx) 222 { 223 int ret; 224 pthread_t vsync_thread; 225 ALOGI("Initializing VSYNC Thread"); 226 ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx); 227 if (ret) { 228 ALOGE("%s: failed to create %s: %s", __FUNCTION__, 229 HWC_VSYNC_THREAD_NAME, strerror(ret)); 230 } 231 } 232 233 }; //namespace 234
