wlroots/backend/drm/drm.c

575 lines
14 KiB
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>
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#include "backend/drm/backend.h"
#include "backend/drm/drm.h"
#include "backend/drm/event.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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static const char *egl_error(void)
{
switch (eglGetError()) {
case EGL_SUCCESS:
return "Success";
case EGL_NOT_INITIALIZED:
return "Not initialized";
case EGL_BAD_ACCESS:
return "Bad access";
case EGL_BAD_ALLOC:
return "Bad alloc";
case EGL_BAD_ATTRIBUTE:
return "Bad attribute";
case EGL_BAD_CONTEXT:
return "Bad Context";
case EGL_BAD_CONFIG:
return "Bad Config";
case EGL_BAD_CURRENT_SURFACE:
return "Bad current surface";
case EGL_BAD_DISPLAY:
return "Bad display";
case EGL_BAD_SURFACE:
return "Bad surface";
case EGL_BAD_MATCH:
return "Bad match";
case EGL_BAD_PARAMETER:
return "Bad parameter";
case EGL_BAD_NATIVE_PIXMAP:
return "Bad native pixmap";
case EGL_BAD_NATIVE_WINDOW:
return "Bad native window";
case EGL_CONTEXT_LOST:
return "Context lost";
default:
return "Unknown";
}
}
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// EGL extensions
PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display;
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC create_platform_window_surface;
static bool egl_exts()
{
get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
eglGetProcAddress("eglGetPlatformDisplayEXT");
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if (!get_platform_display) {
wlr_log(L_ERROR, "Failed to load EGL extension 'eglGetPlatformDisplayEXT'");
return false;
}
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create_platform_window_surface = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
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if (!get_platform_display) {
wlr_log(L_ERROR, "Failed to load EGL extension 'eglCreatePlatformWindowSurfaceEXT'");
return false;
}
return true;
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}
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static bool egl_get_config(EGLDisplay disp, EGLConfig *out)
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{
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;
}
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bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer,
struct wlr_drm_backend *backend, int fd)
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{
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if (!egl_exts())
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return false;
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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;
}
if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
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wlr_log(L_ERROR, "Failed to bind to the OpenGL ES API: %s", egl_error());
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goto error_gbm;
}
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renderer->egl.disp = get_platform_display(EGL_PLATFORM_GBM_MESA, renderer->gbm, NULL);
if (renderer->egl.disp == EGL_NO_DISPLAY) {
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wlr_log(L_ERROR, "Failed to create EGL display: %s", egl_error());
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goto error_gbm;
}
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if (eglInitialize(renderer->egl.disp, NULL, NULL) == EGL_FALSE) {
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wlr_log(L_ERROR, "Failed to initialize EGL: %s", egl_error());
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goto error_egl;
}
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if (!egl_get_config(renderer->egl.disp, &renderer->egl.conf)) {
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wlr_log(L_ERROR, "Failed to get EGL config");
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goto error_egl;
}
static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
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renderer->egl.context = eglCreateContext(renderer->egl.disp,
renderer->egl.conf, EGL_NO_CONTEXT, attribs);
if (renderer->egl.context == EGL_NO_CONTEXT) {
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wlr_log(L_ERROR, "Failed to create EGL context: %s", egl_error());
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goto error_egl;
}
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renderer->fd = fd;
renderer->backend = backend;
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return true;
error_egl:
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eglTerminate(renderer->egl.disp);
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eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
error_gbm:
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gbm_device_destroy(renderer->gbm);
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return false;
}
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void wlr_drm_renderer_free(struct wlr_drm_renderer *renderer)
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{
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if (!renderer)
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return;
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eglDestroyContext(renderer->egl.disp, renderer->egl.context);
eglTerminate(renderer->egl.disp);
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eglReleaseThread();
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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gbm_device_destroy(renderer->gbm);
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}
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void wlr_drm_scan_connectors(struct wlr_drm_backend *backend)
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{
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drmModeRes *res = drmModeGetResources(backend->fd);
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if (!res) {
wlr_log(L_ERROR, "Failed to get DRM resources");
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return;
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}
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// 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.
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if ((size_t)res->count_connectors > backend->display_len) {
struct wlr_drm_display *new = realloc(backend->displays, sizeof *new * res->count_connectors);
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if (!new) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
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goto error;
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}
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for (int i = backend->display_len; i < res->count_connectors; ++i) {
new[i] = (struct wlr_drm_display) {
.state = DRM_DISP_INVALID,
.renderer = &backend->renderer,
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};
}
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backend->display_len = res->count_connectors;
backend->displays = new;
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}
for (int i = 0; i < res->count_connectors; ++i) {
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struct wlr_drm_display *disp = &backend->displays[i];
drmModeConnector *conn = drmModeGetConnector(backend->fd, res->connectors[i]);
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if (!conn)
continue;
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if (backend->displays[i].state == DRM_DISP_INVALID) {
disp->state = DRM_DISP_DISCONNECTED;
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disp->connector = res->connectors[i];
snprintf(disp->name, sizeof disp->name, "%s-%"PRIu32,
conn_name[conn->connector_type],
conn->connector_type_id);
}
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if (disp->state == DRM_DISP_DISCONNECTED &&
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conn->connection == DRM_MODE_CONNECTED) {
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disp->state = DRM_DISP_NEEDS_MODESET;
wlr_drm_add_event(backend, disp, DRM_EV_DISPLAY_ADD);
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} else if (disp->state == DRM_DISP_CONNECTED &&
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conn->connection != DRM_MODE_CONNECTED) {
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disp->state = DRM_DISP_DISCONNECTED;
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wlr_drm_display_free(disp, false);
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wlr_drm_add_event(backend, disp, DRM_EV_DISPLAY_REM);
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}
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);
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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 bool display_init_renderer(struct wlr_drm_renderer *renderer,
struct wlr_drm_display *disp)
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{
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disp->renderer = renderer;
disp->gbm = gbm_surface_create(renderer->gbm,
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disp->width, disp->height,
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
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if (!disp->gbm) {
wlr_log(L_ERROR, "Failed to create GBM surface for %s: %s", disp->name,
strerror(errno));
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return false;
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}
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disp->egl = create_platform_window_surface(renderer->egl.disp, renderer->egl.conf,
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disp->gbm, NULL);
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if (disp->egl == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface for %s: %s", disp->name,
egl_error());
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return false;
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}
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// Render black frame
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eglMakeCurrent(renderer->egl.disp, disp->egl, disp->egl, renderer->egl.context);
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glViewport(0, 0, disp->width, disp->height);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
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eglSwapBuffers(renderer->egl.disp, disp->egl);
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struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
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uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
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drmModeSetCrtc(renderer->fd, disp->crtc, fb_id, 0, 0,
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&disp->connector, 1, disp->active_mode);
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drmModePageFlip(renderer->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
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gbm_surface_release_buffer(disp->gbm, bo);
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return true;
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}
static drmModeModeInfo *select_mode(size_t num_modes,
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drmModeModeInfo modes[static num_modes],
drmModeCrtc *old_crtc,
const char *str)
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{
if (strcmp(str, "preferred") == 0)
return &modes[0];
if (strcmp(str, "current") == 0) {
if (!old_crtc) {
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wlr_log(L_ERROR, "Display does not have currently configured mode");
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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) {
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wlr_log(L_ERROR, "Invalid modesetting string '%s'", str);
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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];
}
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wlr_log(L_ERROR, "Unable to find mode %ux%u@%u", width, height, rate);
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return NULL;
}
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bool wlr_drm_display_modeset(struct wlr_drm_backend *backend,
struct wlr_drm_display *disp, const char *str)
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{
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wlr_log(L_INFO, "Modesetting %s with '%s'", disp->name, str);
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drmModeConnector *conn = drmModeGetConnector(backend->fd, disp->connector);
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if (!conn) {
wlr_log(L_ERROR, "Failed to get DRM connector");
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goto error;
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}
if (conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0) {
wlr_log(L_ERROR, "%s is not connected", disp->name);
goto error;
}
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disp->num_modes = conn->count_modes;
disp->modes = malloc(sizeof *disp->modes * disp->num_modes);
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if (!disp->modes) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
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goto error;
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}
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memcpy(disp->modes, conn->modes, sizeof *disp->modes * disp->num_modes);
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wlr_log(L_INFO, "Detected modes:");
for (size_t i = 0; i < disp->num_modes; ++i)
wlr_log(L_INFO, " %"PRIu16"@%"PRIu16"@%"PRIu32,
disp->modes[i].hdisplay, disp->modes[i].vdisplay,
disp->modes[i].vrefresh);
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drmModeEncoder *curr_enc = drmModeGetEncoder(backend->fd, conn->encoder_id);
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if (curr_enc) {
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disp->old_crtc = drmModeGetCrtc(backend->fd, curr_enc->crtc_id);
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free(curr_enc);
}
disp->active_mode = select_mode(disp->num_modes, disp->modes, disp->old_crtc, str);
if (!disp->active_mode) {
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wlr_log(L_ERROR, "Failed to configure %s", disp->name);
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goto error;
}
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drmModeRes *res = drmModeGetResources(backend->fd);
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if (!res) {
wlr_log(L_ERROR, "Failed to get DRM resources");
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goto error;
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}
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bool success = false;
for (int i = 0; !success && i < conn->count_encoders; ++i) {
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drmModeEncoder *enc = drmModeGetEncoder(backend->fd, conn->encoders[i]);
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if (!enc)
continue;
for (int j = 0; j < res->count_crtcs; ++j) {
if ((enc->possible_crtcs & (1 << j)) == 0)
continue;
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if ((backend->taken_crtcs & (1 << j)) == 0) {
backend->taken_crtcs |= 1 << j;
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disp->crtc = res->crtcs[j];
success = true;
break;
}
}
drmModeFreeEncoder(enc);
}
drmModeFreeResources(res);
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if (!success) {
wlr_log(L_ERROR, "Failed to find CRTC for %s", disp->name);
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goto error;
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}
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disp->state = DRM_DISP_CONNECTED;
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disp->width = disp->active_mode->hdisplay;
disp->height = disp->active_mode->vdisplay;
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if (!display_init_renderer(&backend->renderer, disp)) {
wlr_log(L_ERROR, "Failed to initalise renderer for %s", disp->name);
goto error;
}
drmModeFreeConnector(conn);
wlr_log(L_INFO, "Configuring %s with mode %"PRIu16"x%"PRIu16"@%"PRIu32"\n",
disp->name, disp->active_mode->hdisplay, disp->active_mode->vdisplay,
disp->active_mode->vrefresh);
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return true;
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error:
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disp->state = DRM_DISP_DISCONNECTED;
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drmModeFreeConnector(conn);
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free(disp->modes);
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wlr_drm_add_event(backend, disp, DRM_EV_DISPLAY_REM);
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return false;
}
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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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{
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struct wlr_drm_display *disp = user;
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disp->pageflip_pending = true;
if (!disp->cleanup)
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wlr_drm_add_event(disp->renderer->backend, disp, DRM_EV_RENDER);
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}
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void wlr_drm_display_free(struct wlr_drm_display *disp, bool restore)
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{
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if (!disp || disp->state != DRM_DISP_CONNECTED)
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return;
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struct wlr_drm_renderer *renderer = disp->renderer;
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eglDestroySurface(renderer->egl.disp, disp->egl);
gbm_surface_destroy(disp->gbm);
free(disp->modes);
disp->state = DRM_DISP_DISCONNECTED;
if (!restore)
return;
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drmModeCrtc *crtc = disp->old_crtc;
if (crtc) {
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// Wait for exising page flips to finish
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drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
disp->cleanup = true;
while (disp->pageflip_pending)
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drmHandleEvent(renderer->fd, &event);
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drmModeSetCrtc(renderer->fd, crtc->crtc_id, crtc->buffer_id,
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crtc->x, crtc->y, &disp->connector,
1, &crtc->mode);
drmModeFreeCrtc(crtc);
}
}
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void wlr_drm_event(int fd)
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{
drmEventContext event = {
.version = DRM_EVENT_CONTEXT_VERSION,
.page_flip_handler = page_flip_handler,
};
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drmHandleEvent(fd, &event);
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}
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void wlr_drm_display_begin(struct wlr_drm_display *disp)
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{
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struct wlr_drm_renderer *renderer = disp->renderer;
eglMakeCurrent(renderer->egl.disp, disp->egl, disp->egl, renderer->egl.context);
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}
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void wlr_drm_display_end(struct wlr_drm_display *disp)
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{
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struct wlr_drm_renderer *renderer = disp->renderer;
eglSwapBuffers(renderer->egl.disp, disp->egl);
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struct gbm_bo *bo = gbm_surface_lock_front_buffer(disp->gbm);
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uint32_t fb_id = get_fb_for_bo(renderer->fd, bo);
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drmModePageFlip(renderer->fd, disp->crtc, fb_id, DRM_MODE_PAGE_FLIP_EVENT, disp);
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gbm_surface_release_buffer(disp->gbm, bo);
disp->pageflip_pending = false;
}