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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "hwc-drm-device"
     18 
     19 #include "drmdevice.h"
     20 #include "drmconnector.h"
     21 #include "drmcrtc.h"
     22 #include "drmencoder.h"
     23 #include "drmeventlistener.h"
     24 #include "drmplane.h"
     25 
     26 #include <errno.h>
     27 #include <fcntl.h>
     28 #include <stdint.h>
     29 #include <xf86drm.h>
     30 #include <xf86drmMode.h>
     31 #include <cinttypes>
     32 
     33 #include <cutils/properties.h>
     34 #include <log/log.h>
     35 
     36 namespace android {
     37 
     38 DrmDevice::DrmDevice() : event_listener_(this) {
     39 }
     40 
     41 DrmDevice::~DrmDevice() {
     42   event_listener_.Exit();
     43 }
     44 
     45 std::tuple<int, int> DrmDevice::Init(const char *path, int num_displays) {
     46   /* TODO: Use drmOpenControl here instead */
     47   fd_.Set(open(path, O_RDWR));
     48   if (fd() < 0) {
     49     ALOGE("Failed to open dri- %s", strerror(-errno));
     50     return std::make_tuple(-ENODEV, 0);
     51   }
     52 
     53   int ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
     54   if (ret) {
     55     ALOGE("Failed to set universal plane cap %d", ret);
     56     return std::make_tuple(ret, 0);
     57   }
     58 
     59   ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_ATOMIC, 1);
     60   if (ret) {
     61     ALOGE("Failed to set atomic cap %d", ret);
     62     return std::make_tuple(ret, 0);
     63   }
     64 
     65 #ifdef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
     66   ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
     67   if (ret) {
     68     ALOGI("Failed to set writeback cap %d", ret);
     69     ret = 0;
     70   }
     71 #endif
     72 
     73   drmModeResPtr res = drmModeGetResources(fd());
     74   if (!res) {
     75     ALOGE("Failed to get DrmDevice resources");
     76     return std::make_tuple(-ENODEV, 0);
     77   }
     78 
     79   min_resolution_ = std::pair<uint32_t, uint32_t>(res->min_width,
     80                                                   res->min_height);
     81   max_resolution_ = std::pair<uint32_t, uint32_t>(res->max_width,
     82                                                   res->max_height);
     83 
     84   // Assumes that the primary display will always be in the first
     85   // drm_device opened.
     86   bool found_primary = num_displays != 0;
     87 
     88   for (int i = 0; !ret && i < res->count_crtcs; ++i) {
     89     drmModeCrtcPtr c = drmModeGetCrtc(fd(), res->crtcs[i]);
     90     if (!c) {
     91       ALOGE("Failed to get crtc %d", res->crtcs[i]);
     92       ret = -ENODEV;
     93       break;
     94     }
     95 
     96     std::unique_ptr<DrmCrtc> crtc(new DrmCrtc(this, c, i));
     97     drmModeFreeCrtc(c);
     98 
     99     ret = crtc->Init();
    100     if (ret) {
    101       ALOGE("Failed to initialize crtc %d", res->crtcs[i]);
    102       break;
    103     }
    104     crtcs_.emplace_back(std::move(crtc));
    105   }
    106 
    107   std::vector<int> possible_clones;
    108   for (int i = 0; !ret && i < res->count_encoders; ++i) {
    109     drmModeEncoderPtr e = drmModeGetEncoder(fd(), res->encoders[i]);
    110     if (!e) {
    111       ALOGE("Failed to get encoder %d", res->encoders[i]);
    112       ret = -ENODEV;
    113       break;
    114     }
    115 
    116     std::vector<DrmCrtc *> possible_crtcs;
    117     DrmCrtc *current_crtc = NULL;
    118     for (auto &crtc : crtcs_) {
    119       if ((1 << crtc->pipe()) & e->possible_crtcs)
    120         possible_crtcs.push_back(crtc.get());
    121 
    122       if (crtc->id() == e->crtc_id)
    123         current_crtc = crtc.get();
    124     }
    125 
    126     std::unique_ptr<DrmEncoder> enc(
    127         new DrmEncoder(e, current_crtc, possible_crtcs));
    128     possible_clones.push_back(e->possible_clones);
    129     drmModeFreeEncoder(e);
    130 
    131     encoders_.emplace_back(std::move(enc));
    132   }
    133 
    134   for (unsigned int i = 0; i < encoders_.size(); i++) {
    135     for (unsigned int j = 0; j < encoders_.size(); j++)
    136       if (possible_clones[i] & (1 << j))
    137         encoders_[i]->AddPossibleClone(encoders_[j].get());
    138   }
    139 
    140   for (int i = 0; !ret && i < res->count_connectors; ++i) {
    141     drmModeConnectorPtr c = drmModeGetConnector(fd(), res->connectors[i]);
    142     if (!c) {
    143       ALOGE("Failed to get connector %d", res->connectors[i]);
    144       ret = -ENODEV;
    145       break;
    146     }
    147 
    148     std::vector<DrmEncoder *> possible_encoders;
    149     DrmEncoder *current_encoder = NULL;
    150     for (int j = 0; j < c->count_encoders; ++j) {
    151       for (auto &encoder : encoders_) {
    152         if (encoder->id() == c->encoders[j])
    153           possible_encoders.push_back(encoder.get());
    154         if (encoder->id() == c->encoder_id)
    155           current_encoder = encoder.get();
    156       }
    157     }
    158 
    159     std::unique_ptr<DrmConnector> conn(
    160         new DrmConnector(this, c, current_encoder, possible_encoders));
    161 
    162     drmModeFreeConnector(c);
    163 
    164     ret = conn->Init();
    165     if (ret) {
    166       ALOGE("Init connector %d failed", res->connectors[i]);
    167       break;
    168     }
    169 
    170     if (conn->writeback())
    171       writeback_connectors_.emplace_back(std::move(conn));
    172     else
    173       connectors_.emplace_back(std::move(conn));
    174   }
    175 
    176   // First look for primary amongst internal connectors
    177   for (auto &conn : connectors_) {
    178     if (conn->internal() && !found_primary) {
    179       conn->set_display(num_displays);
    180       displays_[num_displays] = num_displays;
    181       ++num_displays;
    182       found_primary = true;
    183       break;
    184     }
    185   }
    186 
    187   // Then pick first available as primary and for the others assign
    188   // consecutive display_numbers.
    189   for (auto &conn : connectors_) {
    190     if (conn->external() || conn->internal()) {
    191       if (!found_primary) {
    192         conn->set_display(num_displays);
    193         displays_[num_displays] = num_displays;
    194         found_primary = true;
    195         ++num_displays;
    196       } else if (conn->display() < 0) {
    197         conn->set_display(num_displays);
    198         displays_[num_displays] = num_displays;
    199         ++num_displays;
    200       }
    201     }
    202   }
    203 
    204   if (res)
    205     drmModeFreeResources(res);
    206 
    207   // Catch-all for the above loops
    208   if (ret)
    209     return std::make_tuple(ret, 0);
    210 
    211   drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd());
    212   if (!plane_res) {
    213     ALOGE("Failed to get plane resources");
    214     return std::make_tuple(-ENOENT, 0);
    215   }
    216 
    217   for (uint32_t i = 0; i < plane_res->count_planes; ++i) {
    218     drmModePlanePtr p = drmModeGetPlane(fd(), plane_res->planes[i]);
    219     if (!p) {
    220       ALOGE("Failed to get plane %d", plane_res->planes[i]);
    221       ret = -ENODEV;
    222       break;
    223     }
    224 
    225     std::unique_ptr<DrmPlane> plane(new DrmPlane(this, p));
    226 
    227     drmModeFreePlane(p);
    228 
    229     ret = plane->Init();
    230     if (ret) {
    231       ALOGE("Init plane %d failed", plane_res->planes[i]);
    232       break;
    233     }
    234 
    235     planes_.emplace_back(std::move(plane));
    236   }
    237   drmModeFreePlaneResources(plane_res);
    238   if (ret)
    239     return std::make_tuple(ret, 0);
    240 
    241   ret = event_listener_.Init();
    242   if (ret) {
    243     ALOGE("Can't initialize event listener %d", ret);
    244     return std::make_tuple(ret, 0);
    245   }
    246 
    247   for (auto &conn : connectors_) {
    248     ret = CreateDisplayPipe(conn.get());
    249     if (ret) {
    250       ALOGE("Failed CreateDisplayPipe %d with %d", conn->id(), ret);
    251       return std::make_tuple(ret, 0);
    252     }
    253     if (!AttachWriteback(conn.get())) {
    254       ALOGI("Display %d has writeback attach to it", conn->display());
    255     }
    256   }
    257   return std::make_tuple(ret, displays_.size());
    258 }
    259 
    260 bool DrmDevice::HandlesDisplay(int display) const {
    261   return displays_.find(display) != displays_.end();
    262 }
    263 
    264 DrmConnector *DrmDevice::GetConnectorForDisplay(int display) const {
    265   for (auto &conn : connectors_) {
    266     if (conn->display() == display)
    267       return conn.get();
    268   }
    269   return NULL;
    270 }
    271 
    272 DrmConnector *DrmDevice::GetWritebackConnectorForDisplay(int display) const {
    273   for (auto &conn : writeback_connectors_) {
    274     if (conn->display() == display)
    275       return conn.get();
    276   }
    277   return NULL;
    278 }
    279 
    280 // TODO what happens when hotplugging
    281 DrmConnector *DrmDevice::AvailableWritebackConnector(int display) const {
    282   DrmConnector *writeback_conn = GetWritebackConnectorForDisplay(display);
    283   DrmConnector *display_conn = GetConnectorForDisplay(display);
    284   // If we have a writeback already attached to the same CRTC just use that,
    285   // if possible.
    286   if (display_conn && writeback_conn &&
    287       writeback_conn->encoder()->CanClone(display_conn->encoder()))
    288     return writeback_conn;
    289 
    290   // Use another CRTC if available and doesn't have any connector
    291   for (auto &crtc : crtcs_) {
    292     if (crtc->display() == display)
    293       continue;
    294     display_conn = GetConnectorForDisplay(crtc->display());
    295     // If we have a display connected don't use it for writeback
    296     if (display_conn && display_conn->state() == DRM_MODE_CONNECTED)
    297       continue;
    298     writeback_conn = GetWritebackConnectorForDisplay(crtc->display());
    299     if (writeback_conn)
    300       return writeback_conn;
    301   }
    302   return NULL;
    303 }
    304 
    305 DrmCrtc *DrmDevice::GetCrtcForDisplay(int display) const {
    306   for (auto &crtc : crtcs_) {
    307     if (crtc->display() == display)
    308       return crtc.get();
    309   }
    310   return NULL;
    311 }
    312 
    313 DrmPlane *DrmDevice::GetPlane(uint32_t id) const {
    314   for (auto &plane : planes_) {
    315     if (plane->id() == id)
    316       return plane.get();
    317   }
    318   return NULL;
    319 }
    320 
    321 const std::vector<std::unique_ptr<DrmCrtc>> &DrmDevice::crtcs() const {
    322   return crtcs_;
    323 }
    324 
    325 uint32_t DrmDevice::next_mode_id() {
    326   return ++mode_id_;
    327 }
    328 
    329 int DrmDevice::TryEncoderForDisplay(int display, DrmEncoder *enc) {
    330   /* First try to use the currently-bound crtc */
    331   DrmCrtc *crtc = enc->crtc();
    332   if (crtc && crtc->can_bind(display)) {
    333     crtc->set_display(display);
    334     enc->set_crtc(crtc);
    335     return 0;
    336   }
    337 
    338   /* Try to find a possible crtc which will work */
    339   for (DrmCrtc *crtc : enc->possible_crtcs()) {
    340     /* We've already tried this earlier */
    341     if (crtc == enc->crtc())
    342       continue;
    343 
    344     if (crtc->can_bind(display)) {
    345       crtc->set_display(display);
    346       enc->set_crtc(crtc);
    347       return 0;
    348     }
    349   }
    350 
    351   /* We can't use the encoder, but nothing went wrong, try another one */
    352   return -EAGAIN;
    353 }
    354 
    355 int DrmDevice::CreateDisplayPipe(DrmConnector *connector) {
    356   int display = connector->display();
    357   /* Try to use current setup first */
    358   if (connector->encoder()) {
    359     int ret = TryEncoderForDisplay(display, connector->encoder());
    360     if (!ret) {
    361       return 0;
    362     } else if (ret != -EAGAIN) {
    363       ALOGE("Could not set mode %d/%d", display, ret);
    364       return ret;
    365     }
    366   }
    367 
    368   for (DrmEncoder *enc : connector->possible_encoders()) {
    369     int ret = TryEncoderForDisplay(display, enc);
    370     if (!ret) {
    371       connector->set_encoder(enc);
    372       return 0;
    373     } else if (ret != -EAGAIN) {
    374       ALOGE("Could not set mode %d/%d", display, ret);
    375       return ret;
    376     }
    377   }
    378   ALOGE("Could not find a suitable encoder/crtc for display %d",
    379         connector->display());
    380   return -ENODEV;
    381 }
    382 
    383 // Attach writeback connector to the CRTC linked to the display_conn
    384 int DrmDevice::AttachWriteback(DrmConnector *display_conn) {
    385   DrmCrtc *display_crtc = display_conn->encoder()->crtc();
    386   if (GetWritebackConnectorForDisplay(display_crtc->display()) != NULL) {
    387     ALOGE("Display already has writeback attach to it");
    388     return -EINVAL;
    389   }
    390   for (auto &writeback_conn : writeback_connectors_) {
    391     if (writeback_conn->display() >= 0)
    392       continue;
    393     for (DrmEncoder *writeback_enc : writeback_conn->possible_encoders()) {
    394       for (DrmCrtc *possible_crtc : writeback_enc->possible_crtcs()) {
    395         if (possible_crtc != display_crtc)
    396           continue;
    397         // Use just encoders which had not been bound already
    398         if (writeback_enc->can_bind(display_crtc->display())) {
    399           writeback_enc->set_crtc(display_crtc);
    400           writeback_conn->set_encoder(writeback_enc);
    401           writeback_conn->set_display(display_crtc->display());
    402           writeback_conn->UpdateModes();
    403           return 0;
    404         }
    405       }
    406     }
    407   }
    408   return -EINVAL;
    409 }
    410 
    411 int DrmDevice::CreatePropertyBlob(void *data, size_t length,
    412                                   uint32_t *blob_id) {
    413   struct drm_mode_create_blob create_blob;
    414   memset(&create_blob, 0, sizeof(create_blob));
    415   create_blob.length = length;
    416   create_blob.data = (__u64)data;
    417 
    418   int ret = drmIoctl(fd(), DRM_IOCTL_MODE_CREATEPROPBLOB, &create_blob);
    419   if (ret) {
    420     ALOGE("Failed to create mode property blob %d", ret);
    421     return ret;
    422   }
    423   *blob_id = create_blob.blob_id;
    424   return 0;
    425 }
    426 
    427 int DrmDevice::DestroyPropertyBlob(uint32_t blob_id) {
    428   if (!blob_id)
    429     return 0;
    430 
    431   struct drm_mode_destroy_blob destroy_blob;
    432   memset(&destroy_blob, 0, sizeof(destroy_blob));
    433   destroy_blob.blob_id = (__u32)blob_id;
    434   int ret = drmIoctl(fd(), DRM_IOCTL_MODE_DESTROYPROPBLOB, &destroy_blob);
    435   if (ret) {
    436     ALOGE("Failed to destroy mode property blob %" PRIu32 "/%d", blob_id, ret);
    437     return ret;
    438   }
    439   return 0;
    440 }
    441 
    442 DrmEventListener *DrmDevice::event_listener() {
    443   return &event_listener_;
    444 }
    445 
    446 int DrmDevice::GetProperty(uint32_t obj_id, uint32_t obj_type,
    447                            const char *prop_name, DrmProperty *property) {
    448   drmModeObjectPropertiesPtr props;
    449 
    450   props = drmModeObjectGetProperties(fd(), obj_id, obj_type);
    451   if (!props) {
    452     ALOGE("Failed to get properties for %d/%x", obj_id, obj_type);
    453     return -ENODEV;
    454   }
    455 
    456   bool found = false;
    457   for (int i = 0; !found && (size_t)i < props->count_props; ++i) {
    458     drmModePropertyPtr p = drmModeGetProperty(fd(), props->props[i]);
    459     if (!strcmp(p->name, prop_name)) {
    460       property->Init(p, props->prop_values[i]);
    461       found = true;
    462     }
    463     drmModeFreeProperty(p);
    464   }
    465 
    466   drmModeFreeObjectProperties(props);
    467   return found ? 0 : -ENOENT;
    468 }
    469 
    470 int DrmDevice::GetPlaneProperty(const DrmPlane &plane, const char *prop_name,
    471                                 DrmProperty *property) {
    472   return GetProperty(plane.id(), DRM_MODE_OBJECT_PLANE, prop_name, property);
    473 }
    474 
    475 int DrmDevice::GetCrtcProperty(const DrmCrtc &crtc, const char *prop_name,
    476                                DrmProperty *property) {
    477   return GetProperty(crtc.id(), DRM_MODE_OBJECT_CRTC, prop_name, property);
    478 }
    479 
    480 int DrmDevice::GetConnectorProperty(const DrmConnector &connector,
    481                                     const char *prop_name,
    482                                     DrmProperty *property) {
    483   return GetProperty(connector.id(), DRM_MODE_OBJECT_CONNECTOR, prop_name,
    484                      property);
    485 }
    486 }  // namespace android
    487