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mpv/video/out/drm_common.c
NRK e41add29d4 drm_common: don't spoil errno in signal handler 
same rationale as last commit
2023-10-13 11:36:01 +02:00

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <poll.h>
#include <sys/stat.h>
#include <unistd.h>
#include <limits.h>
#include <math.h>
#include <time.h>
#include <drm_fourcc.h>
#include "config.h"
#if HAVE_CONSIO_H
#include <sys/consio.h>
#else
#include <sys/vt.h>
#endif
#include "drm_atomic.h"
#include "drm_common.h"
#include "common/common.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "osdep/io.h"
#include "osdep/poll_wrapper.h"
#include "osdep/timer.h"
#include "misc/ctype.h"
#include "video/out/vo.h"
#define EVT_RELEASE 1
#define EVT_ACQUIRE 2
#define EVT_INTERRUPT 255
#define HANDLER_ACQUIRE 0
#define HANDLER_RELEASE 1
#define RELEASE_SIGNAL SIGUSR1
#define ACQUIRE_SIGNAL SIGUSR2
#define MAX_CONNECTOR_NAME_LEN 20
static int vt_switcher_pipe[2];
static int drm_connector_opt_help(struct mp_log *log, const struct m_option *opt,
struct bstr name);
static int drm_mode_opt_help(struct mp_log *log, const struct m_option *opt,
struct bstr name);
static int drm_validate_mode_opt(struct mp_log *log, const struct m_option *opt,
struct bstr name, const char **value);
static void drm_show_available_modes(struct mp_log *log, const drmModeConnector *connector);
static void drm_show_available_connectors(struct mp_log *log, int card_no,
const char *card_path);
static double mode_get_Hz(const drmModeModeInfo *mode);
#define OPT_BASE_STRUCT struct drm_opts
const struct m_sub_options drm_conf = {
.opts = (const struct m_option[]) {
{"drm-device", OPT_STRING(device_path), .flags = M_OPT_FILE},
{"drm-connector", OPT_STRING(connector_spec),
.help = drm_connector_opt_help},
{"drm-mode", OPT_STRING_VALIDATE(mode_spec, drm_validate_mode_opt),
.help = drm_mode_opt_help},
{"drm-atomic", OPT_CHOICE(drm_atomic, {"no", 0}, {"auto", 1}),
.deprecation_message = "this option is deprecated: DRM Atomic is required"},
{"drm-draw-plane", OPT_CHOICE(draw_plane,
{"primary", DRM_OPTS_PRIMARY_PLANE},
{"overlay", DRM_OPTS_OVERLAY_PLANE}),
M_RANGE(0, INT_MAX)},
{"drm-drmprime-video-plane", OPT_CHOICE(drmprime_video_plane,
{"primary", DRM_OPTS_PRIMARY_PLANE},
{"overlay", DRM_OPTS_OVERLAY_PLANE}),
M_RANGE(0, INT_MAX)},
{"drm-format", OPT_CHOICE(drm_format,
{"xrgb8888", DRM_OPTS_FORMAT_XRGB8888},
{"xrgb2101010", DRM_OPTS_FORMAT_XRGB2101010},
{"xbgr8888", DRM_OPTS_FORMAT_XBGR8888},
{"xbgr2101010", DRM_OPTS_FORMAT_XBGR2101010})},
{"drm-draw-surface-size", OPT_SIZE_BOX(draw_surface_size)},
{"drm-vrr-enabled", OPT_CHOICE(vrr_enabled,
{"no", 0}, {"yes", 1}, {"auto", -1})},
{0},
},
.defaults = &(const struct drm_opts) {
.mode_spec = "preferred",
.drm_atomic = 1,
.draw_plane = DRM_OPTS_PRIMARY_PLANE,
.drmprime_video_plane = DRM_OPTS_OVERLAY_PLANE,
},
.size = sizeof(struct drm_opts),
};
static const char *connector_names[] = {
"Unknown", // DRM_MODE_CONNECTOR_Unknown
"VGA", // DRM_MODE_CONNECTOR_VGA
"DVI-I", // DRM_MODE_CONNECTOR_DVII
"DVI-D", // DRM_MODE_CONNECTOR_DVID
"DVI-A", // DRM_MODE_CONNECTOR_DVIA
"Composite", // DRM_MODE_CONNECTOR_Composite
"SVIDEO", // DRM_MODE_CONNECTOR_SVIDEO
"LVDS", // DRM_MODE_CONNECTOR_LVDS
"Component", // DRM_MODE_CONNECTOR_Component
"DIN", // DRM_MODE_CONNECTOR_9PinDIN
"DP", // DRM_MODE_CONNECTOR_DisplayPort
"HDMI-A", // DRM_MODE_CONNECTOR_HDMIA
"HDMI-B", // DRM_MODE_CONNECTOR_HDMIB
"TV", // DRM_MODE_CONNECTOR_TV
"eDP", // DRM_MODE_CONNECTOR_eDP
"Virtual", // DRM_MODE_CONNECTOR_VIRTUAL
"DSI", // DRM_MODE_CONNECTOR_DSI
"DPI", // DRM_MODE_CONNECTOR_DPI
"Writeback", // DRM_MODE_CONNECTOR_WRITEBACK
"SPI", // DRM_MODE_CONNECTOR_SPI
"USB", // DRM_MODE_CONNECTOR_USB
};
struct drm_mode_spec {
enum {
DRM_MODE_SPEC_BY_IDX, // Specified by idx
DRM_MODE_SPEC_BY_NUMBERS, // Specified by width, height and opt. refresh
DRM_MODE_SPEC_PREFERRED, // Select the preferred mode of the display
DRM_MODE_SPEC_HIGHEST, // Select the mode with the highest resolution
} type;
unsigned int idx;
unsigned int width;
unsigned int height;
double refresh;
};
/* VT Switcher */
static void vt_switcher_sighandler(int sig)
{
int saved_errno = errno;
unsigned char event = sig == RELEASE_SIGNAL ? EVT_RELEASE : EVT_ACQUIRE;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
errno = saved_errno;
}
static bool has_signal_installed(int signo)
{
struct sigaction act = { 0 };
sigaction(signo, 0, &act);
return act.sa_handler != 0;
}
static int install_signal(int signo, void (*handler)(int))
{
struct sigaction act = { 0 };
act.sa_handler = handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
return sigaction(signo, &act, NULL);
}
static void release_vt(void *data)
{
struct vo_drm_state *drm = data;
MP_VERBOSE(drm, "Releasing VT\n");
vo_drm_release_crtc(drm);
}
static void acquire_vt(void *data)
{
struct vo_drm_state *drm = data;
MP_VERBOSE(drm, "Acquiring VT\n");
vo_drm_acquire_crtc(drm);
}
static void vt_switcher_acquire(struct vt_switcher *s,
void (*handler)(void*), void *user_data)
{
s->handlers[HANDLER_ACQUIRE] = handler;
s->handler_data[HANDLER_ACQUIRE] = user_data;
}
static void vt_switcher_release(struct vt_switcher *s,
void (*handler)(void*), void *user_data)
{
s->handlers[HANDLER_RELEASE] = handler;
s->handler_data[HANDLER_RELEASE] = user_data;
}
static bool vt_switcher_init(struct vt_switcher *s, struct mp_log *log)
{
s->tty_fd = -1;
s->log = log;
vt_switcher_pipe[0] = -1;
vt_switcher_pipe[1] = -1;
if (mp_make_cloexec_pipe(vt_switcher_pipe)) {
mp_err(log, "Creating pipe failed: %s\n", mp_strerror(errno));
return false;
}
s->tty_fd = open("/dev/tty", O_RDWR | O_CLOEXEC);
if (s->tty_fd < 0) {
mp_err(log, "Can't open TTY for VT control: %s\n", mp_strerror(errno));
return false;
}
if (has_signal_installed(RELEASE_SIGNAL)) {
mp_err(log, "Can't handle VT release - signal already used\n");
return false;
}
if (has_signal_installed(ACQUIRE_SIGNAL)) {
mp_err(log, "Can't handle VT acquire - signal already used\n");
return false;
}
if (install_signal(RELEASE_SIGNAL, vt_switcher_sighandler)) {
mp_err(log, "Failed to install release signal: %s\n", mp_strerror(errno));
return false;
}
if (install_signal(ACQUIRE_SIGNAL, vt_switcher_sighandler)) {
mp_err(log, "Failed to install acquire signal: %s\n", mp_strerror(errno));
return false;
}
struct vt_mode vt_mode = { 0 };
if (ioctl(s->tty_fd, VT_GETMODE, &vt_mode) < 0) {
mp_err(log, "VT_GETMODE failed: %s\n", mp_strerror(errno));
return false;
}
vt_mode.mode = VT_PROCESS;
vt_mode.relsig = RELEASE_SIGNAL;
vt_mode.acqsig = ACQUIRE_SIGNAL;
// frsig is a signal for forced release. Not implemented on Linux,
// Solaris, BSDs but must be set to a valid signal on some of those.
vt_mode.frsig = SIGIO; // unused
if (ioctl(s->tty_fd, VT_SETMODE, &vt_mode) < 0) {
mp_err(log, "VT_SETMODE failed: %s\n", mp_strerror(errno));
return false;
}
// Block the VT switching signals from interrupting the VO thread (they will
// still be picked up by other threads, which will fill vt_switcher_pipe for us)
sigset_t set;
sigemptyset(&set);
sigaddset(&set, RELEASE_SIGNAL);
sigaddset(&set, ACQUIRE_SIGNAL);
pthread_sigmask(SIG_BLOCK, &set, NULL);
return true;
}
static void vt_switcher_interrupt_poll(struct vt_switcher *s)
{
unsigned char event = EVT_INTERRUPT;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
}
static void vt_switcher_destroy(struct vt_switcher *s)
{
struct vt_mode vt_mode = {0};
vt_mode.mode = VT_AUTO;
if (ioctl(s->tty_fd, VT_SETMODE, &vt_mode) < 0) {
MP_ERR(s, "VT_SETMODE failed: %s\n", mp_strerror(errno));
return;
}
install_signal(RELEASE_SIGNAL, SIG_DFL);
install_signal(ACQUIRE_SIGNAL, SIG_DFL);
close(s->tty_fd);
close(vt_switcher_pipe[0]);
close(vt_switcher_pipe[1]);
}
static void vt_switcher_poll(struct vt_switcher *s, int timeout_ns)
{
struct pollfd fds[1] = {
{ .events = POLLIN, .fd = vt_switcher_pipe[0] },
};
mp_poll(fds, 1, timeout_ns);
if (!fds[0].revents)
return;
unsigned char event;
if (read(fds[0].fd, &event, sizeof(event)) != sizeof(event))
return;
switch (event) {
case EVT_RELEASE:
s->handlers[HANDLER_RELEASE](s->handler_data[HANDLER_RELEASE]);
if (ioctl(s->tty_fd, VT_RELDISP, 1) < 0) {
MP_ERR(s, "Failed to release virtual terminal\n");
}
break;
case EVT_ACQUIRE:
s->handlers[HANDLER_ACQUIRE](s->handler_data[HANDLER_ACQUIRE]);
if (ioctl(s->tty_fd, VT_RELDISP, VT_ACKACQ) < 0) {
MP_ERR(s, "Failed to acquire virtual terminal\n");
}
break;
case EVT_INTERRUPT:
break;
}
}
bool vo_drm_acquire_crtc(struct vo_drm_state *drm)
{
if (drm->active)
return true;
drm->active = true;
if (drmSetMaster(drm->fd)) {
MP_WARN(drm, "Failed to acquire DRM master: %s\n",
mp_strerror(errno));
}
struct drm_atomic_context *atomic_ctx = drm->atomic_context;
if (!drm_atomic_save_old_state(atomic_ctx))
MP_WARN(drm, "Failed to save old DRM atomic state\n");
drmModeAtomicReqPtr request = drmModeAtomicAlloc();
if (!request) {
MP_ERR(drm, "Failed to allocate drm atomic request\n");
goto err;
}
if (drm_object_set_property(request, atomic_ctx->connector, "CRTC_ID", drm->crtc_id) < 0) {
MP_ERR(drm, "Could not set CRTC_ID on connector\n");
goto err;
}
if (!drm_mode_ensure_blob(drm->fd, &drm->mode)) {
MP_ERR(drm, "Failed to create DRM mode blob\n");
goto err;
}
if (drm_object_set_property(request, atomic_ctx->crtc, "MODE_ID", drm->mode.blob_id) < 0) {
MP_ERR(drm, "Could not set MODE_ID on crtc\n");
goto err;
}
if (drm_object_set_property(request, atomic_ctx->crtc, "ACTIVE", 1) < 0) {
MP_ERR(drm, "Could not set ACTIVE on crtc\n");
goto err;
}
/*
* VRR related properties were added in kernel 5.0. We will not fail if we
* cannot query or set the value, but we will log as appropriate.
*/
uint64_t vrr_capable = 0;
drm_object_get_property(atomic_ctx->connector, "VRR_CAPABLE", &vrr_capable);
MP_VERBOSE(drm, "crtc is%s VRR capable\n", vrr_capable ? "" : " not");
uint64_t vrr_requested = drm->opts->vrr_enabled;
if (vrr_requested == 1 || (vrr_capable && vrr_requested == -1)) {
if (drm_object_set_property(request, atomic_ctx->crtc, "VRR_ENABLED", 1) < 0) {
MP_WARN(drm, "Could not enable VRR on crtc\n");
} else {
MP_VERBOSE(drm, "Enabled VRR on crtc\n");
}
}
drm_object_set_property(request, atomic_ctx->draw_plane, "FB_ID", drm->fb->id);
drm_object_set_property(request, atomic_ctx->draw_plane, "CRTC_ID", drm->crtc_id);
drm_object_set_property(request, atomic_ctx->draw_plane, "SRC_X", 0);
drm_object_set_property(request, atomic_ctx->draw_plane, "SRC_Y", 0);
drm_object_set_property(request, atomic_ctx->draw_plane, "SRC_W", drm->width << 16);
drm_object_set_property(request, atomic_ctx->draw_plane, "SRC_H", drm->height << 16);
drm_object_set_property(request, atomic_ctx->draw_plane, "CRTC_X", 0);
drm_object_set_property(request, atomic_ctx->draw_plane, "CRTC_Y", 0);
drm_object_set_property(request, atomic_ctx->draw_plane, "CRTC_W", drm->mode.mode.hdisplay);
drm_object_set_property(request, atomic_ctx->draw_plane, "CRTC_H", drm->mode.mode.vdisplay);
if (drmModeAtomicCommit(drm->fd, request, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL)) {
MP_ERR(drm, "Failed to commit ModeSetting atomic request: %s\n", strerror(errno));
goto err;
}
drmModeAtomicFree(request);
return true;
err:
drmModeAtomicFree(request);
return false;
}
void vo_drm_release_crtc(struct vo_drm_state *drm)
{
if (!drm->active)
return;
drm->active = false;
if (!drm->atomic_context->old_state.saved)
return;
bool success = true;
struct drm_atomic_context *atomic_ctx = drm->atomic_context;
drmModeAtomicReqPtr request = drmModeAtomicAlloc();
if (!request) {
MP_ERR(drm, "Failed to allocate drm atomic request\n");
success = false;
}
if (request && !drm_atomic_restore_old_state(request, atomic_ctx)) {
MP_WARN(drm, "Got error while restoring old state\n");
success = false;
}
if (request) {
if (drmModeAtomicCommit(drm->fd, request, DRM_MODE_ATOMIC_ALLOW_MODESET, NULL)) {
MP_WARN(drm, "Failed to commit ModeSetting atomic request: %s\n",
mp_strerror(errno));
success = false;
}
}
if (request)
drmModeAtomicFree(request);
if (!success)
MP_ERR(drm, "Failed to restore previous mode\n");
if (drmDropMaster(drm->fd)) {
MP_WARN(drm, "Failed to drop DRM master: %s\n",
mp_strerror(errno));
}
}
/* libdrm */
static void get_connector_name(const drmModeConnector *connector,
char ret[MAX_CONNECTOR_NAME_LEN])
{
const char *type_name;
if (connector->connector_type < MP_ARRAY_SIZE(connector_names)) {
type_name = connector_names[connector->connector_type];
} else {
type_name = "UNKNOWN";
}
snprintf(ret, MAX_CONNECTOR_NAME_LEN, "%s-%d", type_name,
connector->connector_type_id);
}
// Gets the first connector whose name matches the input parameter.
// The returned connector may be disconnected.
// Result must be freed with drmModeFreeConnector.
static drmModeConnector *get_connector_by_name(const drmModeRes *res,
const char *connector_name,
int fd)
{
for (int i = 0; i < res->count_connectors; i++) {
drmModeConnector *connector
= drmModeGetConnector(fd, res->connectors[i]);
if (!connector)
continue;
char other_connector_name[MAX_CONNECTOR_NAME_LEN];
get_connector_name(connector, other_connector_name);
if (!strcmp(connector_name, other_connector_name))
return connector;
drmModeFreeConnector(connector);
}
return NULL;
}
// Gets the first connected connector.
// Result must be freed with drmModeFreeConnector.
static drmModeConnector *get_first_connected_connector(const drmModeRes *res,
int fd)
{
for (int i = 0; i < res->count_connectors; i++) {
drmModeConnector *connector = drmModeGetConnector(fd, res->connectors[i]);
if (!connector)
continue;
if (connector->connection == DRM_MODE_CONNECTED && connector->count_modes > 0) {
return connector;
}
drmModeFreeConnector(connector);
}
return NULL;
}
static bool setup_connector(struct vo_drm_state *drm, const drmModeRes *res,
const char *connector_name)
{
drmModeConnector *connector;
if (connector_name && strcmp(connector_name, "") && strcmp(connector_name, "auto")) {
connector = get_connector_by_name(res, connector_name, drm->fd);
if (!connector) {
MP_ERR(drm, "No connector with name %s found\n", connector_name);
drm_show_available_connectors(drm->log, drm->card_no, drm->card_path);
return false;
}
} else {
connector = get_first_connected_connector(res, drm->fd);
if (!connector) {
MP_ERR(drm, "No connected connectors found\n");
return false;
}
}
if (connector->connection != DRM_MODE_CONNECTED) {
drmModeFreeConnector(connector);
MP_ERR(drm, "Chosen connector is disconnected\n");
return false;
}
if (connector->count_modes == 0) {
drmModeFreeConnector(connector);
MP_ERR(drm, "Chosen connector has no valid modes\n");
return false;
}
drm->connector = connector;
return true;
}
static bool setup_crtc(struct vo_drm_state *drm, const drmModeRes *res)
{
// First try to find currently connected encoder and its current CRTC
for (unsigned int i = 0; i < res->count_encoders; i++) {
drmModeEncoder *encoder = drmModeGetEncoder(drm->fd, res->encoders[i]);
if (!encoder) {
MP_WARN(drm, "Cannot retrieve encoder %u:%u: %s\n",
i, res->encoders[i], mp_strerror(errno));
continue;
}
if (encoder->encoder_id == drm->connector->encoder_id && encoder->crtc_id != 0) {
MP_VERBOSE(drm, "Connector %u currently connected to encoder %u\n",
drm->connector->connector_id, drm->connector->encoder_id);
drm->encoder = encoder;
drm->crtc_id = encoder->crtc_id;
goto success;
}
drmModeFreeEncoder(encoder);
}
// Otherwise pick first legal encoder and CRTC combo for the connector
for (unsigned int i = 0; i < drm->connector->count_encoders; ++i) {
drmModeEncoder *encoder
= drmModeGetEncoder(drm->fd, drm->connector->encoders[i]);
if (!encoder) {
MP_WARN(drm, "Cannot retrieve encoder %u:%u: %s\n",
i, drm->connector->encoders[i], mp_strerror(errno));
continue;
}
// iterate all global CRTCs
for (unsigned int j = 0; j < res->count_crtcs; ++j) {
// check whether this CRTC works with the encoder
if (!(encoder->possible_crtcs & (1 << j)))
continue;
drm->encoder = encoder;
drm->crtc_id = res->crtcs[j];
goto success;
}
drmModeFreeEncoder(encoder);
}
MP_ERR(drm, "Connector %u has no suitable CRTC\n",
drm->connector->connector_id);
return false;
success:
MP_VERBOSE(drm, "Selected Encoder %u with CRTC %u\n",
drm->encoder->encoder_id, drm->crtc_id);
return true;
}
static bool all_digits(const char *str)
{
if (str == NULL || str[0] == '\0') {
return false;
}
for (const char *c = str; *c != '\0'; ++c) {
if (!mp_isdigit(*c))
return false;
}
return true;
}
static bool parse_mode_spec(const char *spec, struct drm_mode_spec *parse_result)
{
if (spec == NULL || spec[0] == '\0' || strcmp(spec, "preferred") == 0) {
if (parse_result) {
*parse_result =
(struct drm_mode_spec) { .type = DRM_MODE_SPEC_PREFERRED };
}
return true;
}
if (strcmp(spec, "highest") == 0) {
if (parse_result) {
*parse_result =
(struct drm_mode_spec) { .type = DRM_MODE_SPEC_HIGHEST };
}
return true;
}
// If the string is made up of only digits, it means that it is an index number
if (all_digits(spec)) {
if (parse_result) {
*parse_result = (struct drm_mode_spec) {
.type = DRM_MODE_SPEC_BY_IDX,
.idx = strtoul(spec, NULL, 10),
};
}
return true;
}
if (!mp_isdigit(spec[0]))
return false;
char *height_part, *refresh_part;
const unsigned int width = strtoul(spec, &height_part, 10);
if (spec == height_part || height_part[0] == '\0' || height_part[0] != 'x')
return false;
height_part += 1;
if (!mp_isdigit(height_part[0]))
return false;
const unsigned int height = strtoul(height_part, &refresh_part, 10);
if (height_part == refresh_part)
return false;
char *rest = NULL;
double refresh;
switch (refresh_part[0]) {
case '\0':
refresh = nan("");
break;
case '@':
refresh_part += 1;
if (!(mp_isdigit(refresh_part[0]) || refresh_part[0] == '.'))
return false;
refresh = strtod(refresh_part, &rest);
if (refresh_part == rest || rest[0] != '\0' || refresh < 0.0)
return false;
break;
default:
return false;
}
if (parse_result) {
*parse_result = (struct drm_mode_spec) {
.type = DRM_MODE_SPEC_BY_NUMBERS,
.width = width,
.height = height,
.refresh = refresh,
};
}
return true;
}
static bool setup_mode_by_idx(struct vo_drm_state *drm, unsigned int mode_idx)
{
if (mode_idx >= drm->connector->count_modes) {
MP_ERR(drm, "Bad mode index (max = %d).\n",
drm->connector->count_modes - 1);
return false;
}
drm->mode.mode = drm->connector->modes[mode_idx];
return true;
}
static bool mode_match(const drmModeModeInfo *mode,
unsigned int width,
unsigned int height,
double refresh)
{
if (isnan(refresh)) {
return
(mode->hdisplay == width) &&
(mode->vdisplay == height);
} else {
const double mode_refresh = mode_get_Hz(mode);
return
(mode->hdisplay == width) &&
(mode->vdisplay == height) &&
((int)round(refresh*100) == (int)round(mode_refresh*100));
}
}
static bool setup_mode_by_numbers(struct vo_drm_state *drm,
unsigned int width,
unsigned int height,
double refresh)
{
for (unsigned int i = 0; i < drm->connector->count_modes; ++i) {
drmModeModeInfo *current_mode = &drm->connector->modes[i];
if (mode_match(current_mode, width, height, refresh)) {
drm->mode.mode = *current_mode;
return true;
}
}
MP_ERR(drm, "Could not find mode matching %s\n", drm->opts->mode_spec);
return false;
}
static bool setup_mode_preferred(struct vo_drm_state *drm)
{
for (unsigned int i = 0; i < drm->connector->count_modes; ++i) {
drmModeModeInfo *current_mode = &drm->connector->modes[i];
if (current_mode->type & DRM_MODE_TYPE_PREFERRED) {
drm->mode.mode = *current_mode;
return true;
}
}
// Fall back to first mode
MP_WARN(drm, "Could not find any preferred mode. Picking the first mode.\n");
drm->mode.mode = drm->connector->modes[0];
return true;
}
static bool setup_mode_highest(struct vo_drm_state *drm)
{
unsigned int area = 0;
drmModeModeInfo *highest_resolution_mode = &drm->connector->modes[0];
for (unsigned int i = 0; i < drm->connector->count_modes; ++i) {
drmModeModeInfo *current_mode = &drm->connector->modes[i];
const unsigned int current_area =
current_mode->hdisplay * current_mode->vdisplay;
if (current_area > area) {
highest_resolution_mode = current_mode;
area = current_area;
}
}
drm->mode.mode = *highest_resolution_mode;
return true;
}
static bool setup_mode(struct vo_drm_state *drm)
{
if (drm->connector->count_modes <= 0) {
MP_ERR(drm, "No available modes\n");
return false;
}
struct drm_mode_spec parsed;
if (!parse_mode_spec(drm->opts->mode_spec, &parsed)) {
MP_ERR(drm, "Parse error\n");
goto err;
}
switch (parsed.type) {
case DRM_MODE_SPEC_BY_IDX:
if (!setup_mode_by_idx(drm, parsed.idx))
goto err;
break;
case DRM_MODE_SPEC_BY_NUMBERS:
if (!setup_mode_by_numbers(drm, parsed.width, parsed.height, parsed.refresh))
goto err;
break;
case DRM_MODE_SPEC_PREFERRED:
if (!setup_mode_preferred(drm))
goto err;
break;
case DRM_MODE_SPEC_HIGHEST:
if (!setup_mode_highest(drm))
goto err;
break;
default:
MP_ERR(drm, "setup_mode: Internal error\n");
goto err;
}
drmModeModeInfo *mode = &drm->mode.mode;
MP_VERBOSE(drm, "Selected mode: %s (%dx%d@%.2fHz)\n",
mode->name, mode->hdisplay, mode->vdisplay, mode_get_Hz(mode));
return true;
err:
MP_INFO(drm, "Available modes:\n");
drm_show_available_modes(drm->log, drm->connector);
return false;
}
static int open_card_path(const char *path)
{
return open(path, O_RDWR | O_CLOEXEC);
}
static bool card_supports_kms(const char *path)
{
int fd = open_card_path(path);
bool ret = fd != -1 && drmIsKMS(fd);
if (fd != -1)
close(fd);
return ret;
}
static bool card_has_connection(const char *path)
{
int fd = open_card_path(path);
bool ret = false;
if (fd != -1) {
drmModeRes *res = drmModeGetResources(fd);
if (res) {
drmModeConnector *connector = get_first_connected_connector(res, fd);
if (connector)
ret = true;
drmModeFreeConnector(connector);
drmModeFreeResources(res);
}
close(fd);
}
return ret;
}
static void get_primary_device_path(struct vo_drm_state *drm)
{
if (drm->opts->device_path) {
drm->card_path = talloc_strdup(drm, drm->opts->device_path);
return;
}
drmDevice *devices[DRM_MAX_MINOR] = { 0 };
int card_count = drmGetDevices2(0, devices, MP_ARRAY_SIZE(devices));
bool card_no_given = drm->card_no >= 0;
if (card_count < 0) {
MP_ERR(drm, "Listing DRM devices with drmGetDevices failed! (%s)\n",
mp_strerror(errno));
goto err;
}
if (card_no_given && drm->card_no > (card_count - 1)) {
MP_ERR(drm, "Card number %d given too high! %d devices located.\n",
drm->card_no, card_count);
goto err;
}
for (int i = card_no_given ? drm->card_no : 0; i < card_count; i++) {
drmDevice *dev = devices[i];
if (!(dev->available_nodes & (1 << DRM_NODE_PRIMARY))) {
if (card_no_given) {
MP_ERR(drm, "DRM card number %d given, but it does not have "
"a primary node!\n", i);
break;
}
continue;
}
const char *card_path = dev->nodes[DRM_NODE_PRIMARY];
if (!card_supports_kms(card_path)) {
if (card_no_given) {
MP_ERR(drm,
"DRM card number %d given, but it does not support "
"KMS!\n", i);
break;
}
continue;
}
if (!card_has_connection(card_path)) {
if (card_no_given) {
MP_ERR(drm,
"DRM card number %d given, but it does not have any "
"connected outputs.\n", i);
break;
}
continue;
}
MP_VERBOSE(drm, "Picked DRM card %d, primary node %s%s.\n",
i, card_path,
card_no_given ? "" : " as the default");
drm->card_path = talloc_strdup(drm, card_path);
drm->card_no = i;
break;
}
if (!drm->card_path)
MP_ERR(drm, "No primary DRM device could be picked!\n");
err:
drmFreeDevices(devices, card_count);
}
static void drm_pflip_cb(int fd, unsigned int msc, unsigned int sec,
unsigned int usec, void *data)
{
struct drm_pflip_cb_closure *closure = data;
struct drm_vsync_tuple *vsync = closure->vsync;
// frame_vsync->ust is the timestamp of the pageflip that happened just before this flip was queued
// frame_vsync->msc is the sequence number of the pageflip that happened just before this flip was queued
// frame_vsync->sbc is the sequence number for the frame that was just flipped to screen
struct drm_vsync_tuple *frame_vsync = closure->frame_vsync;
struct vo_vsync_info *vsync_info = closure->vsync_info;
const bool ready =
(vsync->msc != 0) &&
(frame_vsync->ust != 0) && (frame_vsync->msc != 0);
const uint64_t ust = (sec * 1000000LL) + usec;
const unsigned int msc_since_last_flip = msc - vsync->msc;
if (ready && msc == vsync->msc) {
// Seems like some drivers only increment msc every other page flip when
// running in interlaced mode (I'm looking at you nouveau). Obviously we
// can't work with this, so shame the driver and bail.
mp_err(closure->log,
"Got the same msc value twice: (msc: %u, vsync->msc: %u). This shouldn't happen. Possibly broken driver/interlaced mode?\n",
msc, vsync->msc);
goto fail;
}
vsync->ust = ust;
vsync->msc = msc;
if (ready) {
// Convert to mp_time
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
goto fail;
int64_t now_monotonic = ts.tv_sec * UINT64_C(1000000000) + ts.tv_nsec;
int64_t ust_mp_time = mp_time_ns() - (now_monotonic - vsync->ust * 1000);
const uint64_t ust_since_enqueue = vsync->ust - frame_vsync->ust;
const unsigned int msc_since_enqueue = vsync->msc - frame_vsync->msc;
const unsigned int sbc_since_enqueue = vsync->sbc - frame_vsync->sbc;
vsync_info->vsync_duration = ust_since_enqueue * 1000 / msc_since_enqueue;
vsync_info->skipped_vsyncs = msc_since_last_flip - 1; // Valid iff swap_buffers is called every vsync
vsync_info->last_queue_display_time = ust_mp_time + (sbc_since_enqueue * vsync_info->vsync_duration);
}
fail:
*closure->waiting_for_flip = false;
talloc_free(closure);
}
int vo_drm_control(struct vo *vo, int *events, int request, void *arg)
{
struct vo_drm_state *drm = vo->drm;
switch (request) {
case VOCTRL_GET_DISPLAY_FPS: {
double fps = vo_drm_get_display_fps(drm);
if (fps <= 0)
break;
*(double*)arg = fps;
return VO_TRUE;
}
case VOCTRL_GET_DISPLAY_RES: {
((int *)arg)[0] = drm->mode.mode.hdisplay;
((int *)arg)[1] = drm->mode.mode.vdisplay;
return VO_TRUE;
}
case VOCTRL_PAUSE:
vo->want_redraw = true;
drm->paused = true;
return VO_TRUE;
case VOCTRL_RESUME:
drm->paused = false;
drm->vsync_info.last_queue_display_time = -1;
drm->vsync_info.skipped_vsyncs = 0;
drm->vsync.ust = 0;
drm->vsync.msc = 0;
return VO_TRUE;
}
return VO_NOTIMPL;
}
bool vo_drm_init(struct vo *vo)
{
vo->drm = talloc_zero(NULL, struct vo_drm_state);
struct vo_drm_state *drm = vo->drm;
*drm = (struct vo_drm_state) {
.vo = vo,
.log = mp_log_new(drm, vo->log, "drm"),
.mode = {{0}},
.crtc_id = -1,
.card_no = -1,
};
drm->vt_switcher_active = vt_switcher_init(&drm->vt_switcher, drm->log);
if (drm->vt_switcher_active) {
vt_switcher_acquire(&drm->vt_switcher, acquire_vt, drm);
vt_switcher_release(&drm->vt_switcher, release_vt, drm);
} else {
MP_WARN(drm, "Failed to set up VT switcher. Terminal switching will be unavailable.\n");
}
drm->opts = mp_get_config_group(drm, drm->vo->global, &drm_conf);
drmModeRes *res = NULL;
get_primary_device_path(drm);
if (!drm->card_path) {
MP_ERR(drm, "Failed to find a usable DRM primary node!\n");
goto err;
}
drm->fd = open_card_path(drm->card_path);
if (drm->fd < 0) {
MP_ERR(drm, "Cannot open card \"%d\": %s.\n", drm->card_no, mp_strerror(errno));
goto err;
}
drmVersionPtr ver = drmGetVersion(drm->fd);
if (ver) {
MP_VERBOSE(drm, "Driver: %s %d.%d.%d (%s)\n", ver->name, ver->version_major,
ver->version_minor, ver->version_patchlevel, ver->date);
drmFreeVersion(ver);
}
res = drmModeGetResources(drm->fd);
if (!res) {
MP_ERR(drm, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
goto err;
}
if (!setup_connector(drm, res, drm->opts->connector_spec))
goto err;
if (!setup_crtc(drm, res))
goto err;
if (!setup_mode(drm))
goto err;
// Universal planes allows accessing all the planes (including primary)
if (drmSetClientCap(drm->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
MP_ERR(drm, "Failed to set Universal planes capability\n");
}
if (drmSetClientCap(drm->fd, DRM_CLIENT_CAP_ATOMIC, 1)) {
MP_ERR(drm, "Failed to create DRM atomic context, no DRM Atomic support\n");
goto err;
} else {
MP_VERBOSE(drm, "DRM Atomic support found\n");
drm->atomic_context = drm_atomic_create_context(drm->log, drm->fd, drm->crtc_id,
drm->connector->connector_id,
drm->opts->draw_plane,
drm->opts->drmprime_video_plane);
if (!drm->atomic_context) {
MP_ERR(drm, "Failed to create DRM atomic context\n");
goto err;
}
}
drmModeFreeResources(res);
drm->ev.version = DRM_EVENT_CONTEXT_VERSION;
drm->ev.page_flip_handler = &drm_pflip_cb;
drm->vsync_info.vsync_duration = 0;
drm->vsync_info.skipped_vsyncs = -1;
drm->vsync_info.last_queue_display_time = -1;
return true;
err:
if (res)
drmModeFreeResources(res);
vo_drm_uninit(vo);
return false;
}
void vo_drm_uninit(struct vo *vo)
{
struct vo_drm_state *drm = vo->drm;
if (!drm)
return;
vo_drm_release_crtc(drm);
if (drm->vt_switcher_active)
vt_switcher_destroy(&drm->vt_switcher);
drm_mode_destroy_blob(drm->fd, &drm->mode);
if (drm->connector) {
drmModeFreeConnector(drm->connector);
drm->connector = NULL;
}
if (drm->encoder) {
drmModeFreeEncoder(drm->encoder);
drm->encoder = NULL;
}
if (drm->atomic_context) {
drm_atomic_destroy_context(drm->atomic_context);
}
close(drm->fd);
talloc_free(drm);
vo->drm = NULL;
}
static double mode_get_Hz(const drmModeModeInfo *mode)
{
double rate = mode->clock * 1000.0 / mode->htotal / mode->vtotal;
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
rate *= 2.0;
return rate;
}
static void drm_show_available_modes(struct mp_log *log,
const drmModeConnector *connector)
{
for (unsigned int i = 0; i < connector->count_modes; i++) {
mp_info(log, " Mode %d: %s (%dx%d@%.2fHz)\n", i,
connector->modes[i].name,
connector->modes[i].hdisplay,
connector->modes[i].vdisplay,
mode_get_Hz(&connector->modes[i]));
}
}
static void drm_show_foreach_connector(struct mp_log *log, int card_no,
const char *card_path,
void (*show_fn)(struct mp_log*, int,
const drmModeConnector*))
{
int fd = open_card_path(card_path);
if (fd < 0) {
mp_err(log, "Failed to open card %d (%s)\n", card_no, card_path);
return;
}
drmModeRes *res = drmModeGetResources(fd);
if (!res) {
mp_err(log, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
goto err;
}
for (int i = 0; i < res->count_connectors; i++) {
drmModeConnector *connector = drmModeGetConnector(fd, res->connectors[i]);
if (!connector)
continue;
show_fn(log, card_no, connector);
drmModeFreeConnector(connector);
}
err:
if (fd >= 0)
close(fd);
if (res)
drmModeFreeResources(res);
}
static void drm_show_connector_name_and_state_callback(struct mp_log *log, int card_no,
const drmModeConnector *connector)
{
char other_connector_name[MAX_CONNECTOR_NAME_LEN];
get_connector_name(connector, other_connector_name);
const char *connection_str = (connector->connection == DRM_MODE_CONNECTED) ?
"connected" : "disconnected";
mp_info(log, " %s (%s)\n", other_connector_name, connection_str);
}
static void drm_show_available_connectors(struct mp_log *log, int card_no,
const char *card_path)
{
mp_info(log, "Available connectors for card %d (%s):\n", card_no,
card_path);
drm_show_foreach_connector(log, card_no, card_path,
drm_show_connector_name_and_state_callback);
mp_info(log, "\n");
}
static void drm_show_connector_modes_callback(struct mp_log *log, int card_no,
const drmModeConnector *connector)
{
if (connector->connection != DRM_MODE_CONNECTED)
return;
char other_connector_name[MAX_CONNECTOR_NAME_LEN];
get_connector_name(connector, other_connector_name);
mp_info(log, "Available modes for drm-connector=%d.%s\n",
card_no, other_connector_name);
drm_show_available_modes(log, connector);
mp_info(log, "\n");
}
static void drm_show_available_connectors_and_modes(struct mp_log *log,
int card_no,
const char *card_path)
{
drm_show_foreach_connector(log, card_no, card_path,
drm_show_connector_modes_callback);
}
static void drm_show_foreach_card(struct mp_log *log,
void (*show_fn)(struct mp_log *, int,
const char *))
{
drmDevice *devices[DRM_MAX_MINOR] = { 0 };
int card_count = drmGetDevices2(0, devices, MP_ARRAY_SIZE(devices));
if (card_count < 0) {
mp_err(log, "Listing DRM devices with drmGetDevices failed! (%s)\n",
mp_strerror(errno));
return;
}
for (int i = 0; i < card_count; i++) {
drmDevice *dev = devices[i];
if (!(dev->available_nodes & (1 << DRM_NODE_PRIMARY)))
continue;
const char *card_path = dev->nodes[DRM_NODE_PRIMARY];
int fd = open_card_path(card_path);
if (fd < 0) {
mp_err(log, "Failed to open primary DRM node path %s!\n",
card_path);
continue;
}
close(fd);
show_fn(log, i, card_path);
}
drmFreeDevices(devices, card_count);
}
static void drm_show_available_cards_and_connectors(struct mp_log *log)
{
drm_show_foreach_card(log, drm_show_available_connectors);
}
static void drm_show_available_cards_connectors_and_modes(struct mp_log *log)
{
drm_show_foreach_card(log, drm_show_available_connectors_and_modes);
}
static int drm_connector_opt_help(struct mp_log *log, const struct m_option *opt,
struct bstr name)
{
drm_show_available_cards_and_connectors(log);
return M_OPT_EXIT;
}
static int drm_mode_opt_help(struct mp_log *log, const struct m_option *opt,
struct bstr name)
{
drm_show_available_cards_connectors_and_modes(log);
return M_OPT_EXIT;
}
static int drm_validate_mode_opt(struct mp_log *log, const struct m_option *opt,
struct bstr name, const char **value)
{
const char *param = *value;
if (!parse_mode_spec(param, NULL)) {
mp_fatal(log, "Invalid value for option drm-mode. Must be a positive number, a string of the format WxH[@R] or 'help'\n");
return M_OPT_INVALID;
}
return 1;
}
/* Helpers */
double vo_drm_get_display_fps(struct vo_drm_state *drm)
{
return mode_get_Hz(&drm->mode.mode);
}
void vo_drm_get_vsync(struct vo *vo, struct vo_vsync_info *info)
{
struct vo_drm_state *drm = vo->drm;
*info = drm->vsync_info;
}
void vo_drm_set_monitor_par(struct vo *vo)
{
struct vo_drm_state *drm = vo->drm;
if (vo->opts->force_monitor_aspect != 0.0) {
vo->monitor_par = drm->fb->width / (double) drm->fb->height /
vo->opts->force_monitor_aspect;
} else {
vo->monitor_par = 1 / vo->opts->monitor_pixel_aspect;
}
MP_VERBOSE(drm, "Monitor pixel aspect: %g\n", vo->monitor_par);
}
void vo_drm_wait_events(struct vo *vo, int64_t until_time_ns)
{
struct vo_drm_state *drm = vo->drm;
if (drm->vt_switcher_active) {
int64_t wait_ns = until_time_ns - mp_time_ns();
int64_t timeout_ns = MPCLAMP(wait_ns, 1e6, 1e10);
vt_switcher_poll(&drm->vt_switcher, timeout_ns);
} else {
vo_wait_default(vo, until_time_ns);
}
}
void vo_drm_wait_on_flip(struct vo_drm_state *drm)
{
// poll page flip finish event
while (drm->waiting_for_flip) {
const int timeout_ms = 3000;
struct pollfd fds[1] = { { .events = POLLIN, .fd = drm->fd } };
poll(fds, 1, timeout_ms);
if (fds[0].revents & POLLIN) {
const int ret = drmHandleEvent(drm->fd, &drm->ev);
if (ret != 0) {
MP_ERR(drm, "drmHandleEvent failed: %i\n", ret);
return;
}
}
}
}
void vo_drm_wakeup(struct vo *vo)
{
struct vo_drm_state *drm = vo->drm;
if (drm->vt_switcher_active)
vt_switcher_interrupt_poll(&drm->vt_switcher);
}
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