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#define _GNU_SOURCE /* for asprintf() */
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "fb.h"
#include "settings.h"
#include "util.h"
/* drm fb backend, everything drm-specific in rototiller resides here. */
typedef struct drm_fb_t {
int drm_fd;
drmModeCrtc *crtc;
drmModeConnector *connector;
drmModeModeInfo *mode;
} drm_fb_t;
typedef struct drm_fb_page_t drm_fb_page_t;
struct drm_fb_page_t {
uint32_t *mmap;
size_t mmap_size;
uint32_t drm_dumb_handle;
uint32_t drm_fb_id;
};
typedef struct drm_fb_setup_t {
const char *dev;
const char *connector;
const char *mode;
} drm_fb_setup_t;
static const char * connector_type_name(uint32_t type) {
static const char *connector_types[] = {
"Unknown",
"VGA",
"DVII",
"DVID",
"DVIA",
"Composite",
"SVIDEO",
"LVDS",
"Component",
"SPinDIN",
"DisplayPort",
"HDMIA",
"HDMIB",
"TV",
"eDP",
"VIRTUAL",
"DSI"
};
assert(type < nelems(connector_types));
return connector_types[type];
}
static setting_desc_t * dev_desc_generator(void *setup_context)
{
setting_desc_t *desc = NULL;
(void) setting_desc_clone(&(setting_desc_t){
.name = "DRM Device Path",
.key = "dev",
.regex = "/dev/dri/card[0-9]",
.preferred = "/dev/dri/card0",
.values = NULL,
.annotations = NULL
}, &desc);
return desc;
}
/* returns a NULL-terminated array of drm connectors */
static const char ** get_connectors(const char *dev)
{
int counts[64] = {}; /* assuming this is big enough */
char **connectors;
int i, fd;
drmModeRes *res;
assert(dev);
fd = open(dev, O_RDWR);
if (fd == -1)
return NULL;
res = drmModeGetResources(fd);
if (!res) {
close(fd);
return NULL;
}
connectors = calloc(res->count_connectors + 1, sizeof(*connectors));
if (!connectors) {
close(fd);
return NULL;
}
for (i = 0; i < res->count_connectors; i++) {
drmModeConnector *con;
con = drmModeGetConnector(fd, res->connectors[i]);
if (!con) {
close(fd);
return NULL;
}
counts[con->connector_type]++;
asprintf(&connectors[i], "%s-%i", connector_type_name(con->connector_type), counts[con->connector_type]); /* TODO: errors */
drmModeFreeConnector(con);
}
drmModeFreeResources(res);
close(fd);
return (const char **)connectors;
}
static void free_strv(const char **strv)
{
int i;
for (i = 0; strv[i]; i++)
free((void *)strv[i]);
free((void *)strv);
}
static setting_desc_t * connector_desc_generator(void *setup_context)
{
drm_fb_setup_t *s = setup_context;
const char **connectors;
setting_desc_t *desc = NULL;
connectors = get_connectors(s->dev);
if (!connectors)
return NULL;
(void) setting_desc_clone(&(setting_desc_t){
.name = "DRM Connector",
.key = "connector",
.regex = "[a-zA-Z0-9]+",
.preferred = connectors[0],
.values = connectors,
.annotations = NULL
}, &desc);
free_strv(connectors);
return desc;
}
static drmModeConnector * lookup_connector(int fd, const char *connector)
{
int i, counts[64] = {}; /* assuming this is big enough */
drmModeConnector *con = NULL;
drmModeRes *res;
res = drmModeGetResources(fd);
if (!res)
goto _out;
for (i = 0; i < res->count_connectors; i++) {
char *str;
con = drmModeGetConnector(fd, res->connectors[i]);
if (!con)
goto _out_res;
counts[con->connector_type]++;
asprintf(&str, "%s-%i", connector_type_name(con->connector_type), counts[con->connector_type]); /* TODO: errors */
if (!strcasecmp(str, connector)) {
free(str);
break;
}
free(str);
drmModeFreeConnector(con);
con = NULL;
}
_out_res:
drmModeFreeResources(res);
_out:
return con;
}
/* returns a NULL-terminated array of drm modes for the supplied device and connector */
static const char ** get_modes(const char *dev, const char *connector)
{
char **modes = NULL;
int i, fd;
drmModeConnector *con;
assert(dev);
assert(connector);
fd = open(dev, O_RDWR);
if (fd == -1)
goto _out;
con = lookup_connector(fd, connector);
if (!con)
goto _out_fd;
modes = calloc(con->count_modes + 1, sizeof(*modes));
if (!modes)
goto _out_con;
for (i = 0; i < con->count_modes; i++)
asprintf(&modes[i], "%s@%"PRIu32, con->modes[i].name, con->modes[i].vrefresh);
_out_con:
drmModeFreeConnector(con);
_out_fd:
close(fd);
_out:
return (const char **)modes;
}
static setting_desc_t * mode_desc_generator(void *setup_context)
{
drm_fb_setup_t *s = setup_context;
setting_desc_t *desc = NULL;
const char **modes;
modes = get_modes(s->dev, s->connector);
if (!modes)
return NULL;
(void) setting_desc_clone(&(setting_desc_t){
.name = "DRM Video Mode",
.key = "mode",
.regex = "[0-9]+[xX][0-9]+@[0-9]+",
.preferred = modes[0],
.values = modes,
.annotations = NULL
}, &desc);
free_strv(modes);
return desc;
}
/* setup is called repeatedly as settings is constructed, until 0 is returned. */
/* a negative value is returned on error */
/* positive value indicates another setting is needed, described in next_setting */
static int drm_fb_setup(const settings_t *settings, setting_desc_t **next_setting)
{
drm_fb_setup_t context = {};
setting_desc_generator_t generators[] = {
{
.key = "dev",
.value_ptr = &context.dev,
.func = dev_desc_generator
}, {
.key = "connector",
.value_ptr = &context.connector,
.func = connector_desc_generator
}, {
.key = "mode",
.value_ptr = &context.mode,
.func = mode_desc_generator
},
};
if (!drmAvailable())
return -ENOSYS;
return settings_apply_desc_generators(settings, generators, nelems(generators), &context, next_setting);
}
/* lookup a mode string in the given connector returning its respective modeinfo */
static drmModeModeInfo * lookup_mode(drmModeConnector *connector, const char *mode)
{
int i;
assert(connector);
assert(mode);
for (i = 0; i < connector->count_modes; i++) {
char *str;
asprintf(&str, "%s@%"PRIu32, connector->modes[i].name, connector->modes[i].vrefresh);
if (!strcasecmp(str, mode)) {
free(str);
return &connector->modes[i];
}
free(str);
}
return NULL;
}
/* prepare the drm context for use with the supplied settings */
static void * drm_fb_init(const settings_t *settings)
{
drm_fb_t *c;
const char *dev;
const char *connector;
const char *mode;
drmModeEncoder *enc;
assert(settings);
if (!drmAvailable())
goto _err;
dev = settings_get_value(settings, "dev");
if (!dev)
goto _err;
connector = settings_get_value(settings, "connector");
if (!connector)
goto _err;
mode = settings_get_value(settings, "mode");
if (!mode)
goto _err;
c = calloc(1, sizeof(drm_fb_t));
if (!c)
goto _err;
c->drm_fd = open(dev, O_RDWR);
if (c->drm_fd < 0)
goto _err_ctxt;
c->connector = lookup_connector(c->drm_fd, connector);
if (!c->connector)
goto _err_fd;
c->mode = lookup_mode(c->connector, mode);
if (!c->mode)
goto _err_con;
enc = drmModeGetEncoder(c->drm_fd, c->connector->encoder_id);
if (!enc)
goto _err_con;
c->crtc = drmModeGetCrtc(c->drm_fd, enc->crtc_id);
if (!c->crtc)
goto _err_enc;
drmModeFreeEncoder(enc);
return c;
_err_enc:
drmModeFreeEncoder(enc);
_err_con:
drmModeFreeConnector(c->connector);
_err_fd:
close(c->drm_fd);
_err_ctxt:
free(c);
_err:
return NULL;
}
static void drm_fb_shutdown(void *context)
{
drm_fb_t *c = context;
assert(c);
close(c->drm_fd);
drmModeFreeConnector(c->connector);
drmModeFreeCrtc(c->crtc);
free(c);
}
static int drm_fb_acquire(void *context, void *page)
{
drm_fb_t *c = context;
drm_fb_page_t *p = page;
return drmModeSetCrtc(c->drm_fd, c->crtc->crtc_id, p->drm_fb_id, 0, 0, &c->connector->connector_id, 1, c->mode);
}
static void drm_fb_release(void *context)
{
/* TODO restore the existing mode @ last acquire? */
}
static void * drm_fb_page_alloc(void *context, fb_page_t *res_page)
{
struct drm_mode_create_dumb create_dumb = { .bpp = 32 };
struct drm_mode_map_dumb map_dumb = {};
uint32_t *map, fb_id;
drm_fb_t *c = context;
drm_fb_page_t *p;
p = calloc(1, sizeof(drm_fb_page_t));
if (!p)
return NULL;
create_dumb.width = c->mode->hdisplay;
create_dumb.height = c->mode->vdisplay;
pexit_if(ioctl(c->drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb) < 0,
"unable to create dumb buffer");
map_dumb.handle = create_dumb.handle;
pexit_if(ioctl(c->drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb) < 0,
"unable to prepare dumb buffer for mmap");
pexit_if(!(map = mmap(NULL, create_dumb.size, PROT_READ|PROT_WRITE, MAP_SHARED, c->drm_fd, map_dumb.offset)),
"unable to mmap dumb buffer");
pexit_if(drmModeAddFB(c->drm_fd, c->mode->hdisplay, c->mode->vdisplay, 24, 32, create_dumb.pitch, create_dumb.handle, &fb_id) < 0,
"unable to add dumb buffer");
p->mmap = map;
p->mmap_size = create_dumb.size;
p->drm_dumb_handle = map_dumb.handle;
p->drm_fb_id = fb_id;
res_page->fragment.buf = map;
res_page->fragment.width = c->mode->hdisplay;
res_page->fragment.frame_width = c->mode->hdisplay;
res_page->fragment.height = c->mode->vdisplay;
res_page->fragment.frame_height = c->mode->vdisplay;
res_page->fragment.stride = create_dumb.pitch - (c->mode->hdisplay * 4);
res_page->fragment.pitch = create_dumb.pitch;
return p;
}
static int drm_fb_page_free(void *context, void *page)
{
struct drm_mode_destroy_dumb destroy_dumb = {};
drm_fb_t *c = context;
drm_fb_page_t *p = page;
drmModeRmFB(c->drm_fd, p->drm_fb_id);
munmap(p->mmap, p->mmap_size);
destroy_dumb.handle = p->drm_dumb_handle;
ioctl(c->drm_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb); // XXX: errors?
free(p);
return 0;
}
static int drm_fb_page_flip(void *context, void *page)
{
drmEventContext drm_ev_ctx = {
.version = DRM_EVENT_CONTEXT_VERSION,
.vblank_handler = NULL,
.page_flip_handler = NULL
};
drm_fb_t *c = context;
drm_fb_page_t *p = page;
if (drmModePageFlip(c->drm_fd, c->crtc->crtc_id, p->drm_fb_id, DRM_MODE_PAGE_FLIP_EVENT, NULL) < 0)
return -1;
return drmHandleEvent(c->drm_fd, &drm_ev_ctx);
}
fb_ops_t drm_fb_ops = {
.setup = drm_fb_setup,
.init = drm_fb_init,
.shutdown = drm_fb_shutdown,
.acquire = drm_fb_acquire,
.release = drm_fb_release,
.page_alloc = drm_fb_page_alloc,
.page_free = drm_fb_page_free,
.page_flip = drm_fb_page_flip
};
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