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Inital commit of libotd.

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master
Scott Anderson 8 years ago
parent 1aed987301
commit aca13320b3
11 changed files with 1323 additions and 0 deletions
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466
backend/drm/drm.c
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#include "otd.h"
#include "drm.h"
#include "event.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <errno.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_mode.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <gbm.h>
#include <GLES3/gl3.h>
static const char *conn_name[] = {
[DRM_MODE_CONNECTOR_Unknown] = "Unknown",
[DRM_MODE_CONNECTOR_VGA] = "VGA",
[DRM_MODE_CONNECTOR_DVII] = "DVI-I",
[DRM_MODE_CONNECTOR_DVID] = "DVI-D",
[DRM_MODE_CONNECTOR_DVIA] = "DVI-A",
[DRM_MODE_CONNECTOR_Composite] = "Composite",
[DRM_MODE_CONNECTOR_SVIDEO] = "SVIDEO",
[DRM_MODE_CONNECTOR_LVDS] = "LVDS",
[DRM_MODE_CONNECTOR_Component] = "Component",
[DRM_MODE_CONNECTOR_9PinDIN] = "DIN",
[DRM_MODE_CONNECTOR_DisplayPort] = "DP",
[DRM_MODE_CONNECTOR_HDMIA] = "HDMI-A",
[DRM_MODE_CONNECTOR_HDMIB] = "HDMI-B",
[DRM_MODE_CONNECTOR_TV] = "TV",
[DRM_MODE_CONNECTOR_eDP] = "eDP",
[DRM_MODE_CONNECTOR_VIRTUAL] = "Virtual",
[DRM_MODE_CONNECTOR_DSI] = "DSI",
};
// EGL extensions
PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display;
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC create_platform_window_surface;
static bool egl_exts()
{
get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
eglGetProcAddress("eglGetPlatformDisplayEXT");
create_platform_window_surface = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
return get_platform_display && create_platform_window_surface;
}
bool egl_get_config(EGLDisplay disp, EGLConfig *out)
{
EGLint count = 0, matched = 0, ret;
ret = eglGetConfigs(disp, NULL, 0, &count);
if (ret == EGL_FALSE || count == 0) {
return false;
}
EGLConfig configs[count];
ret = eglChooseConfig(disp, NULL, configs, count, &matched);
if (ret == EGL_FALSE) {
return false;
}
for (int i = 0; i < matched; ++i) {
EGLint gbm_format;
if (!eglGetConfigAttrib(disp,
configs[i],
EGL_NATIVE_VISUAL_ID,
&gbm_format))
continue;
if (gbm_format == GBM_FORMAT_XRGB8888) {
*out = configs[i];
return true;
}
}
return false;
}
bool init_renderer(struct otd *otd)
{
if (!egl_exts()) {
fprintf(stderr, "Could not get EGL extensions\n");
return false;
}
otd->gbm = gbm_create_device(otd->fd);
if (!otd->gbm) {
fprintf(stderr, "Could not create gbm device: %s\n", strerror(errno));
return false;
}
if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
fprintf(stderr, "Could not bind GLES3 API\n");
goto error_gbm;
}
otd->egl.disp = get_platform_display(EGL_PLATFORM_GBM_MESA, otd->gbm, NULL);
if (otd->egl.disp == EGL_NO_DISPLAY) {
fprintf(stderr, "Could not create EGL display\n");
goto error_gbm;
}
if (eglInitialize(otd->egl.disp, NULL, NULL) == EGL_FALSE) {
fprintf(stderr, "Could not initalise EGL\n");
goto error_egl;
}
if (!egl_get_config(otd->egl.disp, &otd->egl.conf)) {
fprintf(stderr, "Could not get EGL config\n");
goto error_egl;
}
static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
otd->egl.context = eglCreateContext(otd->egl.disp, otd->egl.conf, EGL_NO_CONTEXT, attribs);
if (otd->egl.context == EGL_NO_CONTEXT) {
fprintf(stderr, "Could not create EGL context\n");
goto error_egl;
}
return true;
error_egl:
eglTerminate(otd->egl.disp);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
error_gbm:
gbm_device_destroy(otd->gbm);
return false;
}
void destroy_renderer(struct otd *otd)
{
if (!otd)
return;
eglDestroyContext(otd->egl.disp, otd->egl.context);
eglTerminate(otd->egl.disp);
eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
gbm_device_destroy(otd->gbm);
}
void scan_connectors(struct otd *otd)
{
drmModeRes *res = drmModeGetResources(otd->fd);
if (!res)
return;
// I don't know if this needs to be allocated with realloc like this,
// as it may not even be possible for the number of connectors to change.
// I'll just have to see how DisplayPort MST works with DRM.
if ((size_t)res->count_connectors > otd->display_len) {
struct otd_display *new = realloc(otd->displays, sizeof *new * res->count_connectors);
if (!new)
goto error;
for (int i = otd->display_len; i < res->count_connectors; ++i) {
new[i] = (struct otd_display) {
.state = OTD_DISP_INVALID,
.otd = otd,
};
}
otd->display_len = res->count_connectors;
otd->displays = new;
}
for (int i = 0; i < res->count_connectors; ++i) {
struct otd_display *disp = &otd->displays[i];
drmModeConnector *conn = drmModeGetConnector(otd->fd, res->connectors[i]);
if (!conn)
continue;
if (otd->displays[i].state == OTD_DISP_INVALID) {
disp->state = OTD_DISP_DISCONNECTED;
disp->connector = res->connectors[i];
snprintf(disp->name, sizeof disp->name, "%s-%"PRIu32,
conn_name[conn->connector_type],
conn->connector_type_id);
}
if (disp->state == OTD_DISP_DISCONNECTED &&
conn->connection == DRM_MODE_CONNECTED) {
disp->state = OTD_DISP_NEEDS_MODESET;
event_add(otd, disp, OTD_EV_DISPLAY_ADD);
} else if (disp->state == OTD_DISP_CONNECTED &&
conn->connection != DRM_MODE_CONNECTED) {
disp->state = OTD_DISP_DISCONNECTED;
event_add(otd, disp, OTD_EV_DISPLAY_REM);
}
drmModeFreeConnector(conn);
}
error:
drmModeFreeResources(res);
}
static void free_fb(struct gbm_bo *bo, void *data)
{
uint32_t *id = data;
if (id && *id)
drmModeRmFB(gbm_bo_get_fd(bo), *id);
free(id);
}
static uint32_t get_fb_for_bo(int fd, struct gbm_bo *bo)
{
uint32_t *id = gbm_bo_get_user_data(bo);
if (id)
return *id;
id = calloc(1, sizeof *id);
if (!id)
return 0;
drmModeAddFB(fd, gbm_bo_get_width(bo), gbm_bo_get_height(bo), 24, 32,
gbm_bo_get_stride(bo), gbm_bo_get_handle(bo).u32, id);
gbm_bo_set_user_data(bo, id, free_fb);
return *id;
}
static void init_display_renderer(struct otd *otd, struct otd_display *disp)
{
disp->gbm = gbm_surface_create(otd->gbm,
disp->width, disp->height,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!disp->gbm)
return;
disp->egl = create_platform_window_surface(otd->egl.disp, otd->egl.conf,
disp->gbm, NULL);
if (disp->egl == EGL_NO_SURFACE)
return;
// Render black frame
eglMakeCurrent(otd->egl.disp, disp->egl, disp->egl, otd->egl.context);
glViewport(0, 0, disp->width, disp->height);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
eglSwapBuffers(otd->egl.disp, disp->egl);
struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
uint32_t fb_id = get_fb_for_bo(otd->fd, bo);
drmModeSetCrtc(otd->fd, disp->crtc, fb_id, 0, 0,
&disp->connector, 1, disp->active_mode);
drmModePageFlip(otd->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
gbm_surface_release_buffer(disp->gbm, bo);
}
static drmModeModeInfo *select_mode(size_t num_modes,
drmModeModeInfo modes[static num_modes],
drmModeCrtc *old_crtc,
const char *str)
{
if (strcmp(str, "preferred") == 0)
return &modes[0];
if (strcmp(str, "current") == 0) {
if (!old_crtc) {
fprintf(stderr, "Display does not have currently configured mode\n");
return NULL;
}
for (size_t i = 0; i < num_modes; ++i) {
if (memcmp(&modes[i], &old_crtc->mode, sizeof modes[0]) == 0)
return &modes[i];
}
// We should never get here
assert(0);
}
unsigned width = 0;
unsigned height = 0;
unsigned rate = 0;
int ret;
if ((ret = sscanf(str, "%ux%u@%u", &width, &height, &rate)) != 2 && ret != 3) {
fprintf(stderr, "Invalid modesetting string\n");
return NULL;
}
for (size_t i = 0; i < num_modes; ++i) {
if (modes[i].hdisplay == width &&
modes[i].vdisplay == height &&
(!rate || modes[i].vrefresh == rate))
return &modes[i];
}
return NULL;
}
bool modeset_str(struct otd *otd, struct otd_display *disp, const char *str)
{
drmModeConnector *conn = drmModeGetConnector(otd->fd, disp->connector);
if (!conn || conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0)
goto error;
disp->num_modes = conn->count_modes;
disp->modes = malloc(sizeof *disp->modes * disp->num_modes);
if (!disp->modes)
goto error;
memcpy(disp->modes, conn->modes, sizeof *disp->modes * disp->num_modes);
drmModeEncoder *curr_enc = drmModeGetEncoder(otd->fd, conn->encoder_id);
if (curr_enc) {
disp->old_crtc = drmModeGetCrtc(otd->fd, curr_enc->crtc_id);
free(curr_enc);
}
disp->active_mode = select_mode(disp->num_modes, disp->modes, disp->old_crtc, str);
if (!disp->active_mode) {
fprintf(stderr, "Could not find mode '%s' for %s\n", str, disp->name);
goto error;
}
fprintf(stderr, "Configuring %s with mode %ux%u@%u\n",
disp->name, disp->active_mode->hdisplay, disp->active_mode->vdisplay,
disp->active_mode->vrefresh);
drmModeRes *res = drmModeGetResources(otd->fd);
if (!res)
goto error;
bool success = false;
for (int i = 0; !success && i < conn->count_encoders; ++i) {
drmModeEncoder *enc = drmModeGetEncoder(otd->fd, conn->encoders[i]);
if (!enc)
continue;
for (int j = 0; j < res->count_crtcs; ++j) {
if ((enc->possible_crtcs & (1 << j)) == 0)
continue;
if ((otd->taken_crtcs & (1 << j)) == 0) {
otd->taken_crtcs |= 1 << j;
disp->crtc = res->crtcs[j];
success = true;
break;
}
}
drmModeFreeEncoder(enc);
}
drmModeFreeResources(res);
if (!success)
goto error;
disp->state = OTD_DISP_CONNECTED;
drmModeFreeConnector(conn);
disp->width = disp->active_mode->hdisplay;
disp->height = disp->active_mode->vdisplay;
init_display_renderer(otd, disp);
return true;
error:
disp->state = OTD_DISP_DISCONNECTED;
drmModeFreeConnector(conn);
event_add(otd, disp, OTD_EV_DISPLAY_REM);
return false;
}
void page_flip_handler(int fd,
unsigned seq,
unsigned tv_sec,
unsigned tv_usec,
void *user)
{
struct otd_display *disp = user;
disp->pageflip_pending = true;
if (!disp->cleanup)
event_add(disp->otd, disp, OTD_EV_RENDER);
}
void destroy_display_renderer(struct otd *otd, struct otd_display *disp)
{
if (!otd || !disp || disp->state != OTD_DISP_CONNECTED)
return;
drmModeCrtc *crtc = disp->old_crtc;
if (crtc) {
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
disp->cleanup = true;
while (disp->pageflip_pending)
drmHandleEvent(otd->fd, &event);
drmModeSetCrtc(otd->fd, crtc->crtc_id, crtc->buffer_id,
crtc->x, crtc->y, &disp->connector,
1, &crtc->mode);
drmModeFreeCrtc(crtc);
}
eglDestroySurface(otd->egl.disp, disp->egl);
gbm_surface_destroy(disp->gbm);
free(disp->modes);
}
void get_drm_event(struct otd *otd)
{
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
drmHandleEvent(otd->fd, &event);
}
void rendering_begin(struct otd_display *disp)
{
struct otd *otd = disp->otd;
eglMakeCurrent(otd->egl.disp, disp->egl, disp->egl, otd->egl.context);
}
void rendering_end(struct otd_display *disp)
{
struct otd *otd = disp->otd;
eglSwapBuffers(otd->egl.disp, disp->egl);
struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
uint32_t fb_id = get_fb_for_bo(otd->fd, bo);
drmModePageFlip(otd->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
gbm_surface_release_buffer(disp->gbm, bo);
disp->pageflip_pending = false;
}

54
backend/drm/drm.h
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#ifndef DRM_H
#define DRM_H
#include <stdbool.h>
#include <stdint.h>
#include <xf86drmMode.h>
#include <EGL/egl.h>
#include <gbm.h>
enum otd_display_state {
OTD_DISP_INVALID,
OTD_DISP_DISCONNECTED,
OTD_DISP_NEEDS_MODESET,
OTD_DISP_CONNECTED,
};
struct otd_display {
struct otd *otd;
enum otd_display_state state;
uint32_t connector;
char name[16];
size_t num_modes;
drmModeModeInfo *modes;
drmModeModeInfo *active_mode;
uint32_t width;
uint32_t height;
uint32_t crtc;
drmModeCrtc *old_crtc;
struct gbm_surface *gbm;
EGLSurface *egl;
uint32_t fb_id;
bool pageflip_pending;
bool cleanup;
};
bool init_renderer(struct otd *otd);
void destroy_renderer(struct otd *otd);
void scan_connectors(struct otd *otd);
bool modeset_str(struct otd *otd, struct otd_display *disp, const char *str);
void destroy_display_renderer(struct otd *otd, struct otd_display *disp);
void get_drm_event(struct otd *otd);
void rendering_begin(struct otd_display *disp);
void rendering_end(struct otd_display *disp);
#endif

91
backend/drm/event.c
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#include "otd.h"
#include "event.h"
#include "drm.h"
#include "udev.h"
#include <stdbool.h>
#include <stdlib.h>
#include <poll.h>
static inline void event_swap(struct otd_event *a, struct otd_event *b)
{
struct otd_event tmp = *a;
*a = *b;
*b = tmp;
}
bool otd_get_event(struct otd *otd, struct otd_event *restrict ret)
{
struct pollfd fds[] = {
{ .fd = otd->fd, .events = POLLIN },
{ .fd = otd->udev_fd, .events = POLLIN },
};
while (poll(fds, 2, 0) > 0) {
if (fds[0].revents)
get_drm_event(otd);
if (fds[1].revents)
otd_udev_event(otd);
}
if (otd->event_len == 0) {
ret->type = OTD_EV_NONE;
ret->display = NULL;
return false;
}
struct otd_event *ev = otd->events;
// Downheap
*ret = ev[0];
ev[0] = ev[--otd->event_len];
size_t i = 0;
while (i < otd->event_len / 2) {
size_t left = i * 2 + 1;
size_t right = i * 2 + 2;
size_t max = (ev[left].type > ev[right].type) ? left : right;
if (ev[i].type <= ev[max].type) {
event_swap(&ev[i], &ev[max]);
i = max;
} else {
break;
}
}
return true;
}
bool event_add(struct otd *otd, struct otd_display *disp, enum otd_event_type type)
{
if (type == OTD_EV_NONE)
return true;
if (otd->event_len == otd->event_cap) {
size_t new_size = (otd->event_cap == 0) ? 8 : otd->event_cap * 2;
struct otd_event *new = realloc(otd->events, sizeof *new * new_size);
if (!new) {
return false;
}
otd->event_cap = new_size;
otd->events = new;
}
struct otd_event *ev = otd->events;
// Upheap
size_t i = otd->event_len++;
ev[i].type = type;
ev[i].display = disp;
size_t j;
while (i > 0 && ev[i].type > ev[(j = (i - 1) / 2)].type) {
event_swap(&ev[i], &ev[j]);
i = j;
}
return true;
}

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backend/drm/event.h
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#ifndef EVENT_H
#define EVENT_H
#include <stdbool.h>
enum otd_event_type {
OTD_EV_NONE,
OTD_EV_RENDER,
OTD_EV_DISPLAY_REM,
OTD_EV_DISPLAY_ADD,
};
struct otd_event {
enum otd_event_type type;
struct otd_display *display;
};
bool otd_get_event(struct otd *otd, struct otd_event *restrict ret);
bool event_add(struct otd *otd, struct otd_display *disp, enum otd_event_type type);
#endif

160
backend/drm/main.c
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#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>
#include <time.h>
#include <GLES3/gl3.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include "otd.h"
#include "drm.h"
#include "event.h"
// I know this is pretty crappy,
// but it's just for the example's sake
struct {
char *name;
char *mode;
} displays[8];
int num_displays = 0;
noreturn void usage(const char *name, int ret)
{
fprintf(stderr, "usage: %s [-o <name> [-m <mode>]]*\n"
"\n"
" -h \tDisplay this help text\n"
" -o <name>\tWhich diplay to use. e.g. DVI-I-1.\n"
" -m <mode>\tWhich mode to use. It must come after an -o option.\n"
" \tMust be either 'preferred', 'current', widthxheight\n"
" \tor widthxheight@rate. Defaults to 'preferred'.\n"
"\n"
"example: %s -o DVI-I-1 -m 1920x1080@60 -o DP-1 -m 1920x1200\n",
name, name);
exit(ret);
}
void parse_args(int argc, char *argv[])
{
int c;
int i = -1;
while ((c = getopt(argc, argv, "ho:m:")) != -1) {
switch (c) {
case 'h':
usage(argv[0], 0);
case 'o':
i = num_displays++;
if (num_displays == 8) {
fprintf(stderr, "Too many displays\n");
exit(1);
}
displays[i].name = strdup(optarg);
break;
case 'm':
if (i == -1) {
fprintf(stderr, "A display is required first\n");
exit(1);
}
fprintf(stderr, "Assigned '%s' to '%s'\n", optarg, displays[i].name);
displays[i].mode = optarg;
i = -1;
break;
default:
usage(argv[0], 1);
}
}
// Trailing args
if (optind != argc) {
usage(argv[0], 1);
}
}
int main(int argc, char *argv[])
{
parse_args(argc, argv);
struct otd *otd = otd_start();
if (!otd)
return 1;
float colour[3] = {1.0, 0.0, 0.0};
int dec = 0;
struct timespec start, now;
clock_gettime(CLOCK_MONOTONIC, &start);
struct timespec last = start;
while (clock_gettime(CLOCK_MONOTONIC, &now) == 0 &&
now.tv_sec < start.tv_sec + 10) {
struct otd_event ev;
if (!otd_get_event(otd, &ev))
continue;
struct otd_display *disp = ev.display;
switch (ev.type) {
case OTD_EV_RENDER:
rendering_begin(disp);
// This is all just calculating the colours.
// It's not particularly important.
long ms = (now.tv_sec - last.tv_sec) * 1000 +
(now.tv_nsec - last.tv_nsec) / 1000000;
int inc = (dec + 1) % 3;
colour[dec] -= ms / 2000.0f;
colour[inc] += ms / 2000.0f;
if (colour[dec] < 0.0f) {
colour[dec] = 0.0f;
colour[inc] = 1.0f;
dec = (dec + 1) % 3;
}
last = now;
glViewport(0, 0, disp->width, disp->height);
glClearColor(colour[0], colour[1], colour[2], 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
rendering_end(disp);
break;
case OTD_EV_DISPLAY_REM:
printf("%s removed\n", disp->name);
break;
case OTD_EV_DISPLAY_ADD:
printf("%s added\n", disp->name);
const char *mode = NULL;
for (int i = 0; i < num_displays; ++i) {
if (strcmp(disp->name, displays[i].name) == 0) {
mode = displays[i].mode;
}
}
if (!mode)
mode = "preferred";
if (!modeset_str(otd, ev.display, mode)) {
fprintf(stderr, "Modesetting %s failed\n", disp->name);
goto out;
}
break;
default:
break;
}
}
out:
otd_finish(otd);
}

71
backend/drm/otd.c
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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include "otd.h"
#include "drm.h"
#include "event.h"
#include "session.h"
#include "udev.h"
struct otd *otd_start(void)
{
struct otd *otd = calloc(1, sizeof *otd);
if (!otd)
return NULL;
if (!otd_new_session(otd)) {
fprintf(stderr, "Could not create session\n");
goto error;
}
if (!otd_udev_start(otd)) {
fprintf(stderr, "Could not start udev\n");
goto error_session;
}
otd_udev_find_gpu(otd);
if (otd->fd == -1) {
fprintf(stderr, "Could not open GPU\n");
goto error_udev;
}
if (!init_renderer(otd)) {
fprintf(stderr, "Could not initalise renderer\n");
goto error_fd;
}
scan_connectors(otd);
return otd;
error_fd:
release_device(otd, otd->fd);
error_udev:
otd_udev_finish(otd);
error_session:
otd_close_session(otd);
error:
free(otd);
return NULL;
}
void otd_finish(struct otd *otd)
{
if (!otd)
return;
for (size_t i = 0; i < otd->display_len; ++i) {
destroy_display_renderer(otd, &otd->displays[i]);
}
destroy_renderer(otd);
otd_close_session(otd);
otd_udev_finish(otd);
close(otd->fd);
free(otd->events);
free(otd->displays);
free(otd);
}

44
backend/drm/otd.h
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#ifndef LIBOTD_H
#define LIBOTD_H
#include <stdbool.h>
#include <stddef.h>
#include <EGL/egl.h>
#include <gbm.h>
#include <libudev.h>
#include "session.h"
struct otd {
int fd;
bool paused;
// Priority Queue (Max-heap)
size_t event_cap;
size_t event_len;
struct otd_event *events;
size_t display_len;
struct otd_display *displays;
uint32_t taken_crtcs;
struct gbm_device *gbm;
struct {
EGLDisplay disp;
EGLConfig conf;
EGLContext context;
} egl;
struct otd_session session;
struct udev *udev;
struct udev_monitor *mon;
int udev_fd;
char *drm_path;
};
struct otd *otd_start(void);
void otd_finish(struct otd *otd);
#endif

224
backend/drm/session.c
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#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-login.h>
#include <unistd.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "session.h"
#include "otd.h"
int take_device(struct otd *restrict otd,
const char *restrict path,
bool *restrict paused_out)
{
int ret;
int fd = -1;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct otd_session *s = &otd->session;
struct stat st;
if (stat(path, &st) < 0) {
fprintf(stderr, "Failed to stat '%s'\n", path);
return -1;
}
ret = sd_bus_call_method(s->bus,
"org.freedesktop.login1",
s->path,
"org.freedesktop.login1.Session",
"TakeDevice",
&error, &msg,
"uu", major(st.st_rdev), minor(st.st_rdev));
if (ret < 0) {
fprintf(stderr, "%s\n", error.message);
goto error;
}
int paused = 0;
ret = sd_bus_message_read(msg, "hb", &fd, &paused);
if (ret < 0) {
fprintf(stderr, "%s\n", strerror(-ret));
goto error;
}
// The original fd seem to be closed when the message is freed
// so we just clone it.
fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (paused_out)
*paused_out = paused;
error:
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return fd;
}
void release_device(struct otd *otd, int fd)
{
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct otd_session *s = &otd->session;
struct stat st;
if (fstat(fd, &st) < 0) {
fprintf(stderr, "Could not stat fd %d\n", fd);
return;
}
ret = sd_bus_call_method(s->bus,
"org.freedesktop.login1",
s->path,
"org.freedesktop.login1.Session",
"ReleaseDevice",
&error, &msg,
"uu", major(st.st_rdev), minor(st.st_rdev));
if (ret < 0) {
/* Log something */;
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
}
static bool session_activate(struct otd *otd)
{
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct otd_session *s = &otd->session;
ret = sd_bus_call_method(s->bus,
"org.freedesktop.login1",
s->path,
"org.freedesktop.login1.Session",
"Activate",
&error, &msg,
"");
if (ret < 0) {
fprintf(stderr, "%s\n", error.message);
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
static bool take_control(struct otd *otd)
{
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct otd_session *s = &otd->session;
ret = sd_bus_call_method(s->bus,
"org.freedesktop.login1",
s->path,
"org.freedesktop.login1.Session",
"TakeControl",
&error, &msg,
"b", false);
if (ret < 0) {
/* Log something */;
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
static void release_control(struct otd *otd)
{
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct otd_session *s = &otd->session;
ret = sd_bus_call_method(s->bus,
"org.freedesktop.login1",
s->path,
"org.freedesktop.login1.Session",
"ReleaseControl",
&error, &msg,
"");
if (ret < 0) {
/* Log something */;
}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
}
void otd_close_session(struct otd *otd)
{
release_device(otd, otd->fd);
release_control(otd);
sd_bus_unref(otd->session.bus);
free(otd->session.id);
free(otd->session.path);
free(otd->session.seat);
}
bool otd_new_session(struct otd *otd)
{
int ret;
struct otd_session *s = &otd->session;
ret = sd_pid_get_session(getpid(), &s->id);
if (ret < 0) {
fprintf(stderr, "Could not get session\n");
goto error;
}
ret = sd_session_get_seat(s->id, &s->seat);
if (ret < 0) {
fprintf(stderr, "Could not get seat\n");
goto error;
}
// This could be done using asprintf, but I don't want to define _GNU_SOURCE
const char *fmt = "/org/freedesktop/login1/session/%s";
int len = snprintf(NULL, 0, fmt, s->id);
s->path = malloc(len + 1);
if (!s->path)
goto error;
sprintf(s->path, fmt, s->id);
ret = sd_bus_open_system(&s->bus);
if (ret < 0) {
fprintf(stderr, "Could not open bus\n");
goto error;
}
if (!session_activate(otd)) {
fprintf(stderr, "Could not activate session\n");
goto error_bus;
}
if (!take_control(otd)) {
fprintf(stderr, "Could not take control of session\n");
goto error_bus;
}
return true;
error_bus:
sd_bus_unref(s->bus);
error:
free(s->path);
free(s->id);
free(s->seat);
return false;
}

25
backend/drm/session.h
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#ifndef SESSION_H
#define SESSION_H
#include <systemd/sd-bus.h>
#include <stdbool.h>
struct otd_session {
char *id;
char *path;
char *seat;
sd_bus *bus;
};
struct otd;
bool otd_new_session(struct otd *otd);
void otd_close_session(struct otd *otd);
int take_device(struct otd *restrict otd,
const char *restrict path,
bool *restrict paused_out);
void release_device(struct otd *otd, int fd);
#endif

158
backend/drm/udev.c
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#include <libudev.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "otd.h"
#include "udev.h"
#include "session.h"
#include "drm.h"
static bool device_is_kms(struct otd *otd, struct udev_device *dev)
{
const char *path = udev_device_get_devnode(dev);
int fd;
if (!path)
return false;
fd = take_device(otd, path, &otd->paused);
if (fd < 0)
return false;
drmModeRes *res = drmModeGetResources(fd);
if (!res)
goto out_fd;
if (res->count_crtcs <= 0 || res->count_connectors <= 0 ||
res->count_encoders <= 0)
goto out_res;
if (otd->fd >= 0) {
release_device(otd, otd->fd);
free(otd->drm_path);
}
otd->fd = fd;
otd->drm_path = strdup(path);
drmModeFreeResources(res);
return true;
out_res:
drmModeFreeResources(res);
out_fd:
release_device(otd, fd);
return false;
}
void otd_udev_find_gpu(struct otd *otd)
{
struct udev *udev = otd->udev;
otd->fd = -1;
struct udev_enumerate *en = udev_enumerate_new(udev);
if (!en)
return;
udev_enumerate_add_match_subsystem(en, "drm");
udev_enumerate_add_match_sysname(en, "card[0-9]*");
udev_enumerate_scan_devices(en);
struct udev_list_entry *entry;
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
bool is_boot_vga = false;
const char *path = udev_list_entry_get_name(entry);
struct udev_device *dev = udev_device_new_from_syspath(udev, path);
if (!dev)
continue;
const char *seat = udev_device_get_property_value(dev, "ID_SEAT");
if (!seat)
seat = "seat0";
if (strcmp(otd->session.seat, seat) != 0) {
udev_device_unref(dev);
continue;
}
struct udev_device *pci =
udev_device_get_parent_with_subsystem_devtype(dev,
"pci", NULL);
if (pci) {
const char *id = udev_device_get_sysattr_value(pci, "boot_vga");
if (id && strcmp(id, "1") == 0)
is_boot_vga = true;
udev_device_unref(pci);
}
if (!is_boot_vga && otd->fd >= 0) {
udev_device_unref(dev);
continue;
}
if (!device_is_kms(otd, dev)) {
udev_device_unref(dev);
continue;
}
if (is_boot_vga) {
break;
}
}
udev_enumerate_unref(en);
}
bool otd_udev_start(struct otd *otd)
{
otd->udev = udev_new();
if (!otd->udev)
return false;
otd->mon = udev_monitor_new_from_netlink(otd->udev, "udev");
if (!otd->mon) {
udev_unref(otd->udev);
return false;
}
udev_monitor_filter_add_match_subsystem_devtype(otd->mon, "drm", NULL);
udev_monitor_enable_receiving(otd->mon);
otd->udev_fd = udev_monitor_get_fd(otd->mon);
return true;
}
void otd_udev_finish(struct otd *otd)
{
if (!otd)
return;
udev_monitor_unref(otd->mon);
udev_unref(otd->udev);
}
void otd_udev_event(struct otd *otd)
{
struct udev_device *dev = udev_monitor_receive_device(otd->mon);
if (!dev)
return;
const char *path = udev_device_get_devnode(dev);
if (!path || strcmp(path, otd->drm_path) != 0)
goto out;
const char *action = udev_device_get_action(dev);
if (!action || strcmp(action, "change") != 0)
goto out;
scan_connectors(otd);
out:
udev_device_unref(dev);
}

9
backend/drm/udev.h
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#ifndef UDEV_H
#define UDEV_H
bool otd_udev_start(struct otd *otd);
void otd_udev_finish(struct otd *otd);
void otd_udev_find_gpu(struct otd *otd);
void otd_udev_event(struct otd *otd);
#endif
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