libkms++/card.cpp

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <fcntl.h>
   4 #include <utility>
   5 #include <stdexcept>
   6 #include <string.h>
   7 #include <algorithm>
   8
   9 #include <xf86drm.h>
  10 #include <xf86drmMode.h>
  11
  12 #include "kms++.h"
  13
  14 #ifndef DRM_CLIENT_CAP_ATOMIC
  15 #define DRM_CLIENT_CAP_ATOMIC 3
  16 #endif
  17
  18 using namespace std;
  19
  20 namespace kms
  21 {
  22
  23 Card::Card()
  24 {
  25         const char *card = "/dev/dri/card0";
  26
  27         int fd = open(card, O_RDWR | O_CLOEXEC);
  28         if (fd < 0)
  29                 throw invalid_argument(string(strerror(errno)) + " opening " +
  30                                        card);
  31         m_fd = fd;
  32
  33         int r;
  34
  35         r = drmSetMaster(fd);
  36         m_master = r == 0;
  37
  38         if (getenv("LIBKMSXX_DISABLE_UNIVERSAL_PLANES") == 0) {
  39                 r = drmSetClientCap(m_fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
  40                 m_has_universal_planes = r == 0;
  41         } else {
  42                 m_has_universal_planes = false;
  43         }
  44
  45         if (getenv("LIBKMSXX_DISABLE_ATOMIC") == 0) {
  46                 r = drmSetClientCap(m_fd, DRM_CLIENT_CAP_ATOMIC, 1);
  47                 m_has_atomic = r == 0;
  48         } else {
  49                 m_has_atomic = false;
  50         }
  51
  52         uint64_t has_dumb;
  53         r = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &has_dumb);
  54         if (r || !has_dumb)
  55                 throw invalid_argument("Dumb buffers not available");
  56
  57         auto res = drmModeGetResources(m_fd);
  58         if (!res)
  59                 throw invalid_argument("Can't get card resources");
  60
  61         for (int i = 0; i < res->count_connectors; ++i) {
  62                 uint32_t id = res->connectors[i];
  63                 auto ob = new Connector(*this, id, i);
  64                 m_obmap[id] = ob;
  65                 m_connectors.push_back(ob);
  66         }
  67
  68         for (int i = 0; i < res->count_crtcs; ++i) {
  69                 uint32_t id = res->crtcs[i];
  70                 auto ob = new Crtc(*this, id, i);
  71                 m_obmap[id] = ob;
  72                 m_crtcs.push_back(ob);
  73         }
  74
  75         for (int i = 0; i < res->count_encoders; ++i) {
  76                 uint32_t id = res->encoders[i];
  77                 auto ob = new Encoder(*this, id);
  78                 m_obmap[id] = ob;
  79                 m_encoders.push_back(ob);
  80         }
  81
  82         drmModeFreeResources(res);
  83
  84         auto planeRes = drmModeGetPlaneResources(m_fd);
  85
  86         for (uint i = 0; i < planeRes->count_planes; ++i) {
  87                 uint32_t id = planeRes->planes[i];
  88                 auto ob = new Plane(*this, id);
  89                 m_obmap[id] = ob;
  90                 m_planes.push_back(ob);
  91         }
  92
  93         drmModeFreePlaneResources(planeRes);
  94
  95         // collect all possible props
  96         for (auto ob : get_objects()) {
  97                 auto props = drmModeObjectGetProperties(m_fd, ob->id(), ob->object_type());
  98
  99                 if (props == nullptr)
 100                         continue;
 101
 102                 for (unsigned i = 0; i < props->count_props; ++i) {
 103                         uint32_t prop_id = props->props[i];
 104
 105                         if (m_obmap.find(prop_id) == m_obmap.end()) {
 106                                 auto ob = new Property(*this, prop_id);
 107                                 m_obmap[prop_id] = ob;
 108                                 m_properties.push_back(ob);
 109                         }
 110                 }
 111
 112                 drmModeFreeObjectProperties(props);
 113         }
 114
 115         for (auto pair : m_obmap)
 116                 pair.second->setup();
 117 }
 118
 119 Card::~Card()
 120 {
 121         restore_modes();
 122
 123         for (auto pair : m_obmap)
 124                 delete pair.second;
 125
 126         close(m_fd);
 127 }
 128
 129 void Card::restore_modes()
 130 {
 131         for (auto conn : get_connectors())
 132                 conn->restore_mode();
 133 }
 134
 135 template <class T> static void print_obs(const map<uint32_t, DrmObject*>& obmap)
 136 {
 137         for (auto pair : obmap) {
 138                 auto ob = pair.second;
 139                 if (dynamic_cast<T*>(ob)) {
 140                         ob->print_short();
 141                         //ob->print_props();
 142                 }
 143         }
 144 }
 145
 146 void Card::print_short() const
 147 {
 148         print_obs<Connector>(m_obmap);
 149         print_obs<Encoder>(m_obmap);
 150         print_obs<Crtc>(m_obmap);
 151         print_obs<Plane>(m_obmap);
 152 }
 153
 154 Property* Card::get_prop(const string& name) const
 155 {
 156         for (auto prop : m_properties) {
 157                 if (name == prop->name())
 158                         return prop;
 159         }
 160
 161         throw invalid_argument(string("Card property ") + name + " not found");
 162 }
 163
 164 Connector* Card::get_first_connected_connector() const
 165 {
 166         for(auto c : m_connectors) {
 167                 if (c->connected())
 168                         return c;
 169         }
 170
 171         throw invalid_argument("no connected connectors");
 172 }
 173
 174 DrmObject* Card::get_object(uint32_t id) const
 175 {
 176         return m_obmap.at(id);
 177 }
 178
 179 const vector<DrmObject*> Card::get_objects() const
 180 {
 181         vector<DrmObject*> v;
 182         for(auto pair : m_obmap)
 183                 v.push_back(pair.second);
 184         return v;
 185 }
 186
 187 Crtc* Card::get_crtc_by_index(uint32_t idx) const
 188 {
 189         return m_crtcs[idx];
 190 }
 191
 192 Connector* Card::get_connector(uint32_t id) const { return dynamic_cast<Connector*>(get_object(id)); }
 193 Crtc* Card::get_crtc(uint32_t id) const { return dynamic_cast<Crtc*>(get_object(id)); }
 194 Encoder* Card::get_encoder(uint32_t id) const { return dynamic_cast<Encoder*>(get_object(id)); }
 195 Property* Card::get_prop(uint32_t id) const { return dynamic_cast<Property*>(get_object(id)); }
 196 Plane* Card::get_plane(uint32_t id) const { return dynamic_cast<Plane*>(get_object(id)); }
 197
 198 std::vector<kms::Pipeline> Card::get_connected_pipelines()
 199 {
 200         vector<Pipeline> outputs;
 201
 202         for (auto conn : get_connectors())
 203         {
 204                 if (conn->connected() == false)
 205                         continue;
 206
 207                 Crtc* crtc = conn->get_current_crtc();
 208
 209                 if (!crtc) {
 210                         for (auto possible : conn->get_possible_crtcs()) {
 211                                 if (find_if(outputs.begin(), outputs.end(), [possible](Pipeline out) { return out.crtc == possible; }) == outputs.end()) {
 212                                         crtc = possible;
 213                                         break;
 214                                 }
 215                         }
 216                 }
 217
 218                 if (!crtc)
 219                         throw invalid_argument(string("Connector #") +
 220                                                to_string(conn->idx()) +
 221                                                " has no possible crtcs");
 222
 223                 outputs.push_back(Pipeline { crtc, conn });
 224         }
 225
 226         return outputs;
 227 }
 228
 229 static void page_flip_handler(int fd, unsigned int frame,
 230                               unsigned int sec, unsigned int usec,
 231                               void *data)
 232 {
 233         auto handler = (PageFlipHandlerBase*)data;
 234         double time = sec + usec / 1000000.0;
 235         handler->handle_page_flip(frame, time);
 236 }
 237
 238 void Card::call_page_flip_handlers()
 239 {
 240         drmEventContext ev = {
 241                 .version = DRM_EVENT_CONTEXT_VERSION,
 242                 .vblank_handler = 0,
 243                 .page_flip_handler = page_flip_handler,
 244         };
 245
 246         drmHandleEvent(fd(), &ev);
 247 }
 248
 249 }