wlroots/backend/drm/drm.c

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C
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#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>
#include <wayland-server.h>
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#include "wayland.h"
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#include "backend.h"
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#include "backend/drm/backend.h"
#include "backend/drm/drm.h"
#include "common/log.h"
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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",
};
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bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd) {
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renderer->gbm = gbm_create_device(fd);
if (!renderer->gbm) {
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wlr_log(L_ERROR, "Failed to create GBM device: %s", strerror(errno));
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return false;
}
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if (!wlr_egl_init(&renderer->egl, EGL_PLATFORM_GBM_MESA, renderer->gbm)) {
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gbm_device_destroy(renderer->gbm);
return false;
}
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renderer->fd = fd;
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return true;
}
void wlr_drm_renderer_free(struct wlr_drm_renderer *renderer) {
if (!renderer) {
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return;
}
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wlr_egl_free(&renderer->egl);
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gbm_device_destroy(renderer->gbm);
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}
static void free_fb(struct gbm_bo *bo, void *data) {
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uint32_t *id = data;
if (id && *id) {
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drmModeRmFB(gbm_bo_get_fd(bo), *id);
}
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free(id);
}
static uint32_t get_fb_for_bo(int fd, struct gbm_bo *bo) {
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uint32_t *id = gbm_bo_get_user_data(bo);
if (id) {
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return *id;
}
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id = calloc(1, sizeof *id);
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if (!id) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
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return 0;
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}
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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;
}
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static void wlr_drm_output_begin(struct wlr_output_state *output) {
struct wlr_drm_renderer *renderer = output->renderer;
eglMakeCurrent(renderer->egl.display, output->egl,
output->egl, renderer->egl.context);
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}
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static void wlr_drm_output_end(struct wlr_output_state *output) {
struct wlr_drm_renderer *renderer = output->renderer;
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if (!eglSwapBuffers(renderer->egl.display, output->egl)) {
return;
}
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struct gbm_bo *bo = gbm_surface_lock_front_buffer(output->gbm);
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if (!bo) {
return;
}
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uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
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drmModePageFlip(renderer->fd, output->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, output);
gbm_surface_release_buffer(output->gbm, bo);
output->pageflip_pending = true;
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}
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static bool display_init_renderer(struct wlr_drm_renderer *renderer,
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struct wlr_output_state *output) {
struct wlr_output_mode *mode = output->wlr_output->current_mode;
output->renderer = renderer;
output->gbm = gbm_surface_create(renderer->gbm, mode->width,
mode->height, GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!output->gbm) {
wlr_log(L_ERROR, "Failed to create GBM surface for %s: %s", output->name,
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strerror(errno));
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return false;
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}
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output->egl = wlr_egl_create_surface(&renderer->egl, output->gbm);
if (output->egl == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface for %s", output->name);
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return false;
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}
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// Render black frame
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eglMakeCurrent(renderer->egl.display, output->egl, output->egl, renderer->egl.context);
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glViewport(0, 0, output->width, output->height);
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glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
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eglSwapBuffers(renderer->egl.display, output->egl);
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struct gbm_bo *bo = gbm_surface_lock_front_buffer(output->gbm);
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uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
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drmModeSetCrtc(renderer->fd, output->crtc, fb_id, 0, 0,
&output->connector, 1, &mode->state->mode);
drmModePageFlip(renderer->fd, output->crtc, fb_id,
DRM_MODE_PAGE_FLIP_EVENT, output);
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gbm_surface_release_buffer(output->gbm, bo);
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return true;
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}
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static int find_id(const void *item, const void *cmp_to) {
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const struct wlr_output_state *output = item;
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const uint32_t *id = cmp_to;
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if (output->connector < *id) {
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return -1;
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} else if (output->connector > *id) {
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return 1;
} else {
return 0;
}
}
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static bool wlr_drm_output_set_mode(struct wlr_output_state *output,
struct wlr_output_mode *mode) {
struct wlr_backend_state *state =
wl_container_of(output->renderer, state, renderer);
wlr_log(L_INFO, "Modesetting '%s' with '%ux%u@%u mHz'", output->name,
mode->width, mode->height, mode->refresh);
drmModeConnector *conn = drmModeGetConnector(state->fd, output->connector);
if (!conn) {
wlr_log(L_ERROR, "Failed to get DRM connector");
goto error;
}
if (conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0) {
wlr_log(L_ERROR, "%s is not connected", output->name);
goto error;
}
drmModeRes *res = drmModeGetResources(state->fd);
if (!res) {
wlr_log(L_ERROR, "Failed to get DRM resources");
goto error;
}
bool success = false;
for (int i = 0; !success && i < conn->count_encoders; ++i) {
drmModeEncoder *enc = drmModeGetEncoder(state->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 ((state->taken_crtcs & (1 << j)) == 0) {
state->taken_crtcs |= 1 << j;
output->crtc = res->crtcs[j];
success = true;
break;
}
}
drmModeFreeEncoder(enc);
}
drmModeFreeResources(res);
if (!success) {
wlr_log(L_ERROR, "Failed to find CRTC for %s", output->name);
goto error;
}
output->state = DRM_OUTPUT_CONNECTED;
output->width = mode->width;
output->height = mode->height;
output->wlr_output->current_mode = mode;
if (!display_init_renderer(&state->renderer, output)) {
wlr_log(L_ERROR, "Failed to initalise renderer for %s", output->name);
goto error;
}
drmModeFreeConnector(conn);
return true;
error:
wlr_drm_output_cleanup(output, false);
drmModeFreeConnector(conn);
return false;
}
static void wlr_drm_output_enable(struct wlr_output_state *output, bool enable) {
struct wlr_backend_state *state =
wl_container_of(output->renderer, state, renderer);
if (output->state != DRM_OUTPUT_CONNECTED) {
return;
}
if (enable) {
drmModeConnectorSetProperty(state->fd, output->connector, output->props.dpms,
DRM_MODE_DPMS_ON);
// Start rendering loop again by drawing a black frame
wlr_drm_output_begin(output);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
wlr_drm_output_end(output);
} else {
drmModeConnectorSetProperty(state->fd, output->connector, output->props.dpms,
DRM_MODE_DPMS_STANDBY);
}
}
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static void wlr_drm_output_destroy(struct wlr_output_state *output) {
wlr_drm_output_cleanup(output, true);
wlr_drm_renderer_free(output->renderer);
free(output);
}
static struct wlr_output_impl output_impl = {
.set_mode = wlr_drm_output_set_mode,
.enable = wlr_drm_output_enable,
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.destroy = wlr_drm_output_destroy,
};
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static int32_t calculate_refresh_rate(drmModeModeInfo *mode) {
int32_t refresh = (mode->clock * 1000000LL / mode->htotal +
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mode->vtotal / 2) / mode->vtotal;
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
refresh *= 2;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
refresh /= 2;
if (mode->vscan > 1)
refresh /= mode->vscan;
return refresh;
}
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static void scan_property_ids(int fd, drmModeConnector *conn,
struct wlr_output_state *output) {
for (int i = 0; i < conn->count_props; ++i) {
drmModePropertyRes *prop = drmModeGetProperty(fd, conn->props[i]);
if (!prop) {
continue;
}
// I think this is guranteed to exist
if (strcmp(prop->name, "DPMS") == 0) {
output->props.dpms = prop->prop_id;
/* There may be more properties we want to get,
* but since it's currently only this, we exit early
*/
drmModeFreeProperty(prop);
break;
}
drmModeFreeProperty(prop);
}
}
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void wlr_drm_scan_connectors(struct wlr_backend_state *state) {
wlr_log(L_INFO, "Scanning DRM connectors");
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drmModeRes *res = drmModeGetResources(state->fd);
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if (!res) {
wlr_log(L_ERROR, "Failed to get DRM resources");
return;
}
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for (int i = 0; i < res->count_connectors; ++i) {
uint32_t id = res->connectors[i];
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drmModeConnector *conn = drmModeGetConnector(state->fd, id);
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if (!conn) {
wlr_log(L_ERROR, "Failed to get DRM connector");
continue;
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}
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struct wlr_output_state *output;
struct wlr_output *wlr_output;
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int index = list_seq_find(state->outputs, find_id, &id);
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if (index == -1) {
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output = calloc(1, sizeof(struct wlr_output_state));
if (!state) {
drmModeFreeConnector(conn);
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wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
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return;
}
wlr_output = output->wlr_output = wlr_output_create(&output_impl, output);
if (!wlr_output) {
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drmModeFreeConnector(conn);
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wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return;
}
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output->renderer = &state->renderer;
output->state = DRM_OUTPUT_DISCONNECTED;
output->connector = id;
// TODO: Populate more wlr_output fields
// TODO: Move this to wlr_output->name
snprintf(output->name, sizeof(output->name), "%s-%"PRIu32,
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conn_name[conn->connector_type],
conn->connector_type_id);
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drmModeEncoder *curr_enc = drmModeGetEncoder(state->fd, conn->encoder_id);
if (curr_enc) {
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output->old_crtc = drmModeGetCrtc(state->fd, curr_enc->crtc_id);
free(curr_enc);
}
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scan_property_ids(state->fd, conn, output);
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list_add(state->outputs, output);
wlr_log(L_INFO, "Found display '%s'", output->name);
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} else {
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output = state->outputs->items[index];
wlr_output = output->wlr_output;
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}
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// TODO: move state into wlr_output
if (output->state == DRM_OUTPUT_DISCONNECTED &&
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conn->connection == DRM_MODE_CONNECTED) {
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wlr_log(L_INFO, "'%s' connected", output->name);
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wlr_log(L_INFO, "Detected modes:");
for (int i = 0; i < conn->count_modes; ++i) {
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struct wlr_output_mode_state *_state = calloc(1,
sizeof(struct wlr_output_mode_state));
_state->mode = conn->modes[i];
struct wlr_output_mode *mode = calloc(1,
sizeof(struct wlr_output_mode));
mode->width = _state->mode.hdisplay;
mode->height = _state->mode.vdisplay;
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mode->refresh = calculate_refresh_rate(&_state->mode);
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mode->state = _state;
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wlr_log(L_INFO, " %"PRId32"@%"PRId32"@%"PRId32,
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mode->width, mode->height, mode->refresh);
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list_add(wlr_output->modes, mode);
}
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output->state = DRM_OUTPUT_NEEDS_MODESET;
wlr_log(L_INFO, "Sending modesetting signal for '%s'", output->name);
wl_signal_emit(&state->backend->events.output_add, wlr_output);
} else if (output->state == DRM_OUTPUT_CONNECTED &&
conn->connection != DRM_MODE_CONNECTED) {
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wlr_log(L_INFO, "'%s' disconnected", output->name);
wlr_drm_output_cleanup(output, false);
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}
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drmModeFreeConnector(conn);
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}
drmModeFreeResources(res);
}
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static void page_flip_handler(int fd, unsigned seq,
unsigned tv_sec, unsigned tv_usec, void *user) {
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struct wlr_output_state *output = user;
struct wlr_backend_state *state =
wl_container_of(output->renderer, state, renderer);
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output->pageflip_pending = false;
if (output->state == DRM_OUTPUT_CONNECTED) {
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wlr_drm_output_begin(output);
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wl_signal_emit(&output->wlr_output->events.frame, output->wlr_output);
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wlr_drm_output_end(output);
}
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}
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int wlr_drm_event(int fd, uint32_t mask, void *data) {
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
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drmHandleEvent(fd, &event);
return 1;
}
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static void restore_output(struct wlr_output_state *output, int fd) {
// Wait for any pending pageflips to finish
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while (output->pageflip_pending) {
wlr_drm_event(fd, 0, NULL);
}
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drmModeCrtc *crtc = output->old_crtc;
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if (!crtc) {
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return;
}
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drmModeSetCrtc(fd, crtc->crtc_id, crtc->buffer_id, crtc->x, crtc->y,
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&output->connector, 1, &crtc->mode);
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drmModeFreeCrtc(crtc);
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}
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void wlr_drm_output_cleanup(struct wlr_output_state *output, bool restore) {
if (!output) {
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return;
}
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struct wlr_drm_renderer *renderer = output->renderer;
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struct wlr_backend_state *state = wl_container_of(renderer, state, renderer);
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switch (output->state) {
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case DRM_OUTPUT_CONNECTED:
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output->state = DRM_OUTPUT_DISCONNECTED;
if (restore) {
restore_output(output, renderer->fd);
restore = false;
}
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eglDestroySurface(renderer->egl.display, output->egl);
gbm_surface_destroy(output->gbm);
output->egl = EGL_NO_SURFACE;
output->gbm = NULL;
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/* Fallthrough */
case DRM_OUTPUT_NEEDS_MODESET:
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output->state = DRM_OUTPUT_DISCONNECTED;
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if (restore) {
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restore_output(output, renderer->fd);
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}
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wlr_log(L_INFO, "Emmiting destruction signal for '%s'", output->name);
wl_signal_emit(&state->backend->events.output_remove, output->wlr_output);
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break;
case DRM_OUTPUT_DISCONNECTED:
break;
}
}