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mpv/video/out/drm_common.c

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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 <sys/vt.h>
#include <unistd.h>
#include "drm_common.h"
#include "common/common.h"
#include "common/msg.h"
#include "osdep/io.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];
#define OPT_BASE_STRUCT struct drm_opts
const struct m_sub_options drm_conf = {
.opts = (const struct m_option[]) {
OPT_STRING_VALIDATE("drm-connector", drm_connector_spec,
0, drm_validate_connector_opt),
OPT_INT("drm-mode", drm_mode_id, 0),
OPT_INT("drm-osd-plane-id", drm_osd_plane_id, 0),
OPT_INT("drm-video-plane-id", drm_video_plane_id, 0),
OPT_CHOICE("drm-format", drm_format, 0,
({"xrgb8888", DRM_OPTS_FORMAT_XRGB8888},
{"xrgb2101010", DRM_OPTS_FORMAT_XRGB2101010})),
OPT_SIZE_BOX("drm-osd-size", drm_osd_size, 0),
{0},
},
.defaults = &(const struct drm_opts) {
.drm_osd_plane_id = -1,
.drm_video_plane_id = -1,
},
.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
};
// KMS ------------------------------------------------------------------------
static void get_connector_name(
drmModeConnector *connector, char ret[MAX_CONNECTOR_NAME_LEN])
{
snprintf(ret, MAX_CONNECTOR_NAME_LEN, "%s-%d",
connector_names[connector->connector_type],
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 struct kms *kms,
const drmModeRes *res,
const char *connector_name)
{
for (int i = 0; i < res->count_connectors; i++) {
drmModeConnector *connector
= drmModeGetConnector(kms->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 struct kms *kms,
const drmModeRes *res)
{
for (int i = 0; i < res->count_connectors; i++) {
drmModeConnector *connector
= drmModeGetConnector(kms->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 kms *kms, const drmModeRes *res,
const char *connector_name)
{
drmModeConnector *connector;
if (connector_name
&& strcmp(connector_name, "")
&& strcmp(connector_name, "auto")) {
connector = get_connector_by_name(kms, res, connector_name);
if (!connector) {
MP_ERR(kms, "No connector with name %s found\n", connector_name);
kms_show_available_connectors(kms->log, kms->card_no);
return false;
}
} else {
connector = get_first_connected_connector(kms, res);
if (!connector) {
MP_ERR(kms, "No connected connectors found\n");
return false;
}
}
if (connector->connection != DRM_MODE_CONNECTED) {
drmModeFreeConnector(connector);
MP_ERR(kms, "Chosen connector is disconnected\n");
return false;
}
if (connector->count_modes == 0) {
drmModeFreeConnector(connector);
MP_ERR(kms, "Chosen connector has no valid modes\n");
return false;
}
kms->connector = connector;
return true;
}
static bool setup_crtc(struct kms *kms, 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(kms->fd, res->encoders[i]);
if (!encoder) {
MP_WARN(kms, "Cannot retrieve encoder %u:%u: %s\n",
i, res->encoders[i], mp_strerror(errno));
continue;
}
if (encoder->encoder_id == kms->connector->encoder_id && encoder->crtc_id != 0) {
MP_VERBOSE(kms, "Connector %u currently connected to encoder %u\n",
kms->connector->connector_id, kms->connector->encoder_id);
kms->encoder = encoder;
kms->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 < kms->connector->count_encoders; ++i) {
drmModeEncoder *encoder
= drmModeGetEncoder(kms->fd, kms->connector->encoders[i]);
if (!encoder) {
MP_WARN(kms, "Cannot retrieve encoder %u:%u: %s\n",
i, kms->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;
kms->encoder = encoder;
kms->crtc_id = res->crtcs[j];
goto success;
}
drmModeFreeEncoder(encoder);
}
MP_ERR(kms, "Connector %u has no suitable CRTC\n",
kms->connector->connector_id);
return false;
success:
MP_VERBOSE(kms, "Selected Encoder %u with CRTC %u\n",
kms->encoder->encoder_id, kms->crtc_id);
return true;
}
static bool setup_mode(struct kms *kms, int mode_id)
{
if (mode_id < 0 || mode_id >= kms->connector->count_modes) {
MP_ERR(kms, "Bad mode ID (max = %d).\n",
kms->connector->count_modes - 1);
kms_show_available_modes(kms->log, kms->connector);
return false;
}
kms->mode = kms->connector->modes[mode_id];
return true;
}
static int open_card(int card_no)
{
char card_path[128];
snprintf(card_path, sizeof(card_path), DRM_DEV_NAME, DRM_DIR_NAME, card_no);
return open(card_path, O_RDWR | O_CLOEXEC);
}
static void parse_connector_spec(struct mp_log *log,
const char *connector_spec,
int *card_no, char **connector_name)
{
if (!connector_spec) {
*card_no = 0;
*connector_name = NULL;
return;
}
char *dot_ptr = strchr(connector_spec, '.');
if (dot_ptr) {
*card_no = atoi(connector_spec);
*connector_name = talloc_strdup(log, dot_ptr + 1);
} else {
*card_no = 0;
*connector_name = talloc_strdup(log, connector_spec);
}
}
struct kms *kms_create(struct mp_log *log, const char *connector_spec,
int mode_id, int osd_plane_id, int video_plane_id)
{
int card_no = -1;
char *connector_name = NULL;
parse_connector_spec(log, connector_spec, &card_no, &connector_name);
struct kms *kms = talloc(NULL, struct kms);
*kms = (struct kms) {
.log = mp_log_new(kms, log, "kms"),
.fd = open_card(card_no),
.connector = NULL,
.encoder = NULL,
.mode = { 0 },
.crtc_id = -1,
.card_no = card_no,
};
drmModeRes *res = NULL;
if (kms->fd < 0) {
mp_err(log, "Cannot open card \"%d\": %s.\n",
card_no, mp_strerror(errno));
goto err;
}
res = drmModeGetResources(kms->fd);
if (!res) {
mp_err(log, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
goto err;
}
if (!setup_connector(kms, res, connector_name))
goto err;
if (!setup_crtc(kms, res))
goto err;
if (!setup_mode(kms, mode_id))
goto err;
// Universal planes allows accessing all the planes (including primary)
if (drmSetClientCap(kms->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
mp_err(log, "Failed to set Universal planes capability\n");
}
if (drmSetClientCap(kms->fd, DRM_CLIENT_CAP_ATOMIC, 1)) {
mp_verbose(log, "No DRM Atomic support found\n");
} else {
mp_verbose(log, "DRM Atomic support found\n");
kms->atomic_context = drm_atomic_create_context(kms->log, kms->fd, kms->crtc_id,
kms->connector->connector_id, osd_plane_id, video_plane_id);
if (!kms->atomic_context) {
mp_err(log, "Failed to create DRM atomic context\n");
goto err;
}
}
drmModeFreeResources(res);
return kms;
err:
if (res)
drmModeFreeResources(res);
if (connector_name)
talloc_free(connector_name);
kms_destroy(kms);
return NULL;
}
void kms_destroy(struct kms *kms)
{
if (!kms)
return;
if (kms->connector) {
drmModeFreeConnector(kms->connector);
kms->connector = NULL;
}
if (kms->encoder) {
drmModeFreeEncoder(kms->encoder);
kms->encoder = NULL;
}
if (kms->atomic_context) {
drm_atomic_destroy_context(kms->atomic_context);
}
close(kms->fd);
talloc_free(kms);
}
static double mode_get_Hz(const drmModeModeInfo *mode)
{
return mode->clock * 1000.0 / mode->htotal / mode->vtotal;
}
void kms_show_available_modes(
struct mp_log *log, const drmModeConnector *connector)
{
mp_info(log, "Available modes:\n");
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]));
}
}
void kms_show_available_connectors(struct mp_log *log, int card_no)
{
mp_info(log, "Available connectors for card %d:\n", card_no);
int fd = open_card(card_no);
if (fd < 0) {
mp_err(log, "Failed to open card %d\n", card_no);
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;
char other_connector_name[MAX_CONNECTOR_NAME_LEN];
get_connector_name(connector, other_connector_name);
mp_info(log, "%s (%s)\n", other_connector_name,
connector->connection == DRM_MODE_CONNECTED
? "connected"
: "disconnected");
drmModeFreeConnector(connector);
}
err:
if (fd >= 0)
close(fd);
if (res)
drmModeFreeResources(res);
}
void kms_show_available_cards_and_connectors(struct mp_log *log)
{
for (int card_no = 0; card_no < DRM_MAX_MINOR; card_no++) {
int fd = open_card(card_no);
if (fd < 0)
break;
close(fd);
kms_show_available_connectors(log, card_no);
}
}
double kms_get_display_fps(const struct kms *kms)
{
return mode_get_Hz(&kms->mode);
}
int drm_validate_connector_opt(struct mp_log *log, const struct m_option *opt,
struct bstr name, struct bstr param)
{
if (bstr_equals0(param, "help")) {
kms_show_available_cards_and_connectors(log);
return M_OPT_EXIT;
}
return 1;
}
// VT switcher ----------------------------------------------------------------
static void vt_switcher_sighandler(int sig)
{
unsigned char event = sig == RELEASE_SIGNAL ? EVT_RELEASE : EVT_ACQUIRE;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
}
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);
}
bool vt_switcher_init(struct vt_switcher *s, struct mp_log *log)
{
s->log = log;
s->tty_fd = -1;
vt_switcher_pipe[0] = -1;
vt_switcher_pipe[1] = -1;
if (mp_make_cloexec_pipe(vt_switcher_pipe)) {
MP_ERR(s, "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(s, "Can't open TTY for VT control: %s\n", mp_strerror(errno));
return false;
}
if (has_signal_installed(RELEASE_SIGNAL)) {
MP_ERR(s, "Can't handle VT release - signal already used\n");
return false;
}
if (has_signal_installed(ACQUIRE_SIGNAL)) {
MP_ERR(s, "Can't handle VT acquire - signal already used\n");
return false;
}
if (install_signal(RELEASE_SIGNAL, vt_switcher_sighandler)) {
MP_ERR(s, "Failed to install release signal: %s\n", mp_strerror(errno));
return false;
}
if (install_signal(ACQUIRE_SIGNAL, vt_switcher_sighandler)) {
MP_ERR(s, "Failed to install acquire signal: %s\n", mp_strerror(errno));
return false;
}
struct vt_mode vt_mode;
if (ioctl(s->tty_fd, VT_GETMODE, &vt_mode) < 0) {
MP_ERR(s, "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;
if (ioctl(s->tty_fd, VT_SETMODE, &vt_mode) < 0) {
MP_ERR(s, "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;
}
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;
}
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;
}
void vt_switcher_interrupt_poll(struct vt_switcher *s)
{
unsigned char event = EVT_INTERRUPT;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
}
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]);
}
void vt_switcher_poll(struct vt_switcher *s, int timeout_ms)
{
struct pollfd fds[1] = {
{ .events = POLLIN, .fd = vt_switcher_pipe[0] },
};
poll(fds, 1, timeout_ms);
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;
}
}
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