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