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                 m_obmap[id] = new Connector(*this, id, i);
  64         }
  65
  66         for (int i = 0; i < res->count_crtcs; ++i) {
  67                 uint32_t id = res->crtcs[i];
  68                 m_obmap[id] = new Crtc(*this, id, i);
  69         }
  70
  71         for (int i = 0; i < res->count_encoders; ++i) {
  72                 uint32_t id = res->encoders[i];
  73                 m_obmap[id] = new Encoder(*this, id);
  74         }
  75
  76         drmModeFreeResources(res);
  77
  78         auto planeRes = drmModeGetPlaneResources(m_fd);
  79
  80         for (uint i = 0; i < planeRes->count_planes; ++i) {
  81                 uint32_t id = planeRes->planes[i];
  82                 m_obmap[id] = new Plane(*this, id);
  83         }
  84
  85         drmModeFreePlaneResources(planeRes);
  86
  87         // collect all possible props
  88         for (auto ob : get_objects()) {
  89                 auto props = drmModeObjectGetProperties(m_fd, ob->id(), ob->object_type());
  90
  91                 if (props == nullptr)
  92                         continue;
  93
  94                 for (unsigned i = 0; i < props->count_props; ++i) {
  95                         uint32_t prop_id = props->props[i];
  96
  97                         if (m_obmap.find(prop_id) == m_obmap.end())
  98                                 m_obmap[prop_id] = new Property(*this, prop_id);
  99                 }
 100
 101                 drmModeFreeObjectProperties(props);
 102         }
 103
 104         for (auto pair : m_obmap)
 105                 pair.second->setup();
 106 }
 107
 108 Card::~Card()
 109 {
 110         for (auto pair : m_obmap)
 111                 delete pair.second;
 112
 113         close(m_fd);
 114 }
 115
 116 template <class T> static void print_obs(const map<uint32_t, DrmObject*>& obmap)
 117 {
 118         for (auto pair : obmap) {
 119                 auto ob = pair.second;
 120                 if (dynamic_cast<T*>(ob)) {
 121                         ob->print_short();
 122                         //ob->print_props();
 123                 }
 124         }
 125 }
 126
 127 void Card::print_short() const
 128 {
 129         print_obs<Connector>(m_obmap);
 130         print_obs<Encoder>(m_obmap);
 131         print_obs<Crtc>(m_obmap);
 132         print_obs<Plane>(m_obmap);
 133 }
 134
 135 Property* Card::get_prop(const char *name) const
 136 {
 137         for (auto pair : m_obmap) {
 138                 auto prop = dynamic_cast<Property*>(pair.second);
 139                 if (!prop)
 140                         continue;
 141
 142                 if (strcmp(name, prop->name()) == 0)
 143                         return prop;
 144         }
 145
 146         throw invalid_argument(string("Card property ") + name + " not found");
 147 }
 148
 149 Connector* Card::get_first_connected_connector() const
 150 {
 151         for(auto pair : m_obmap) {
 152                 auto c = dynamic_cast<Connector*>(pair.second);
 153
 154                 if (c && c->connected())
 155                         return c;
 156         }
 157
 158         throw invalid_argument("no connected connectors");
 159 }
 160
 161 DrmObject* Card::get_object(uint32_t id) const
 162 {
 163         return m_obmap.at(id);
 164 }
 165
 166 vector<Connector*> Card::get_connectors() const
 167 {
 168         vector<Connector*> v;
 169         for(auto pair : m_obmap) {
 170                 auto p = dynamic_cast<Connector*>(pair.second);
 171                 if (p)
 172                         v.push_back(p);
 173         }
 174         return v;
 175 }
 176
 177 vector<Plane*> Card::get_planes() const
 178 {
 179         vector<Plane*> v;
 180         for(auto pair : m_obmap) {
 181                 auto p = dynamic_cast<Plane*>(pair.second);
 182                 if (p)
 183                         v.push_back(p);
 184         }
 185         return v;
 186 }
 187
 188 vector<DrmObject*> Card::get_objects() const
 189 {
 190         vector<DrmObject*> v;
 191         for(auto pair : m_obmap)
 192                 v.push_back(pair.second);
 193         return v;
 194 }
 195
 196 Crtc* Card::get_crtc_by_index(uint32_t idx) const
 197 {
 198         for(auto pair : m_obmap) {
 199                 auto crtc = dynamic_cast<Crtc*>(pair.second);
 200                 if (crtc && crtc->idx() == idx)
 201                         return crtc;
 202         }
 203         throw invalid_argument(string("Crtc #") + to_string(idx) + "not found");
 204 }
 205
 206 Crtc* Card::get_crtc(uint32_t id) const { return dynamic_cast<Crtc*>(get_object(id)); }
 207 Encoder* Card::get_encoder(uint32_t id) const { return dynamic_cast<Encoder*>(get_object(id)); }
 208 Property* Card::get_prop(uint32_t id) const { return dynamic_cast<Property*>(get_object(id)); }
 209
 210 std::vector<kms::Pipeline> Card::get_connected_pipelines()
 211 {
 212         vector<Pipeline> outputs;
 213
 214         for (auto conn : get_connectors())
 215         {
 216                 if (conn->connected() == false)
 217                         continue;
 218
 219                 Crtc* crtc = conn->get_current_crtc();
 220
 221                 if (!crtc) {
 222                         for (auto possible : conn->get_possible_crtcs()) {
 223                                 if (find_if(outputs.begin(), outputs.end(), [possible](Pipeline out) { return out.crtc == possible; }) == outputs.end()) {
 224                                         crtc = possible;
 225                                         break;
 226                                 }
 227                         }
 228                 }
 229
 230                 if (!crtc)
 231                         throw invalid_argument(string("Connector #") +
 232                                                to_string(conn->idx()) +
 233                                                " has no possible crtcs");
 234
 235                 outputs.push_back(Pipeline { crtc, conn });
 236         }
 237
 238         return outputs;
 239 }
 240
 241 }