gpu-screen-recorder/kms/server/kms_server.c

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#include "../kms_shared.h"
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#include <asm-generic/socket.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
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#include <xf86drm.h>
#include <xf86drmMode.h>
#define DRM_CLIENT_CAP_UNIVERSAL_PLANES 2
typedef struct {
int drmfd;
uint32_t plane_id;
} gsr_drm;
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static int max_int(int a, int b) {
return a > b ? a : b;
}
static int send_msg_to_client(int client_fd, gsr_kms_response *response, int *fds, int num_fds) {
struct iovec iov;
iov.iov_base = response;
iov.iov_len = sizeof(*response);
struct msghdr response_message = {0};
response_message.msg_iov = &iov;
response_message.msg_iovlen = 1;
char cmsgbuf[CMSG_SPACE(sizeof(int)) * max_int(1, num_fds)];
memset(cmsgbuf, 0, sizeof(cmsgbuf));
if(num_fds > 0) {
response_message.msg_control = cmsgbuf;
response_message.msg_controllen = sizeof(cmsgbuf);
int total_msg_len = 0;
struct cmsghdr *cmsg = NULL;
for(int i = 0; i < num_fds; ++i) {
if(i == 0)
cmsg = CMSG_FIRSTHDR(&response_message);
else
cmsg = CMSG_NXTHDR(&response_message, cmsg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
memcpy(CMSG_DATA(cmsg), &fds[i], sizeof(int));
total_msg_len += cmsg->cmsg_len;
}
response_message.msg_controllen = total_msg_len;
}
return sendmsg(client_fd, &response_message, 0);
}
static int kms_get_plane_id(gsr_drm *drm) {
drmModePlaneResPtr planes = NULL;
int result = -1;
int64_t max_size = 0;
uint32_t best_plane_match = UINT32_MAX;
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if(drmSetClientCap(drm->drmfd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1) != 0) {
fprintf(stderr, "kms server error: drmSetClientCap failed, error: %s\n", strerror(errno));
goto error;
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}
planes = drmModeGetPlaneResources(drm->drmfd);
if(!planes) {
fprintf(stderr, "kms server error: failed to access planes, error: %s\n", strerror(errno));
goto error;
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}
for(uint32_t i = 0; i < planes->count_planes; ++i) {
drmModePlanePtr plane = drmModeGetPlane(drm->drmfd, planes->planes[i]);
if(!plane) {
fprintf(stderr, "kms server warning: failed to get drmModePlanePtr for plane %#x: %s (%d)\n", planes->planes[i], strerror(errno), errno);
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continue;
}
if(!plane->fb_id) {
drmModeFreePlane(plane);
continue;
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}
// TODO: Fallback to getfb(1)?
drmModeFB2Ptr drmfb = drmModeGetFB2(drm->drmfd, plane->fb_id);
if(drmfb) {
const int64_t plane_size = (int64_t)drmfb->width * (int64_t)drmfb->height;
if(drmfb->handles[0] && plane_size >= max_size) {
max_size = plane_size;
best_plane_match = plane->plane_id;
}
drmModeFreeFB2(drmfb);
}
drmModeFreePlane(plane);
}
if(best_plane_match == UINT32_MAX || max_size == 0) {
fprintf(stderr, "kms server error: failed to find a usable plane\n");
goto error;
}
drm->plane_id = best_plane_match;
result = 0;
error:
if(planes)
drmModeFreePlaneResources(planes);
return result;
}
static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response) {
drmModePlanePtr plane = NULL;
drmModeFB2 *drmfb = NULL;
int result = -1;
response->result = KMS_RESULT_OK;
response->data.fd.fd = 0;
response->data.fd.width = 0;
response->data.fd.height = 0;
plane = drmModeGetPlane(drm->drmfd, drm->plane_id);
if(!plane) {
response->result = KMS_RESULT_FAILED_TO_GET_PLANE;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to get drm plane with id %u, error: %s\n", drm->plane_id, strerror(errno));
fprintf(stderr, "kms server error: %s\n", response->data.err_msg);
goto error;
}
drmfb = drmModeGetFB2(drm->drmfd, plane->fb_id);
if(!drmfb) {
response->result = KMS_RESULT_FAILED_TO_GET_PLANE;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "drmModeGetFB2 failed, error: %s", strerror(errno));
fprintf(stderr, "kms server error: %s\n", response->data.err_msg);
goto error;
}
if(!drmfb->handles[0]) {
response->result = KMS_RESULT_FAILED_TO_GET_PLANE;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "drmfb handle is NULL");
fprintf(stderr, "kms server error: %s\n", response->data.err_msg);
goto error;
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}
// TODO: Check if dimensions have changed by comparing width and height to previous time this was called.
// TODO: Support other plane formats than rgb (with multiple planes, such as direct YUV420 on wayland).
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int fb_fd = -1;
const int ret = drmPrimeHandleToFD(drm->drmfd, drmfb->handles[0], O_RDONLY, &fb_fd);
if(ret != 0 || fb_fd == -1) {
response->result = KMS_RESULT_FAILED_TO_GET_PLANE;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to get fd from drm handle, error: %s", strerror(errno));
fprintf(stderr, "kms server error: %s\n", response->data.err_msg);
goto error;
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}
response->data.fd.fd = fb_fd;
response->data.fd.width = drmfb->width;
response->data.fd.height = drmfb->height;
response->data.fd.pitch = drmfb->pitches[0];
response->data.fd.offset = drmfb->offsets[0];
response->data.fd.pixel_format = drmfb->pixel_format;
response->data.fd.modifier = drmfb->modifier;
result = 0;
error:
if(drmfb)
drmModeFreeFB2(drmfb);
if(plane)
drmModeFreePlane(plane);
return result;
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}
static double clock_get_monotonic_seconds(void) {
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 0;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (double)ts.tv_sec + (double)ts.tv_nsec * 0.000000001;
}
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int main(int argc, char **argv) {
if(argc != 3) {
fprintf(stderr, "usage: kms_server <domain_socket_path> <card_path>\n");
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return 1;
}
const char *domain_socket_path = argv[1];
int socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if(socket_fd == -1) {
fprintf(stderr, "kms server error: failed to create socket, error: %s\n", strerror(errno));
return 2;
}
const char *card_path = argv[2];
gsr_drm drm;
drm.plane_id = 0;
drm.drmfd = open(card_path, O_RDONLY);
if(drm.drmfd < 0) {
fprintf(stderr, "kms server error: failed to open %s, error: %s", card_path, strerror(errno));
return 2;
}
if(kms_get_plane_id(&drm) != 0) {
close(drm.drmfd);
return 2;
}
fprintf(stderr, "kms server info: connecting to the client\n");
bool connected = false;
const double connect_timeout_sec = 5.0;
const double start_time = clock_get_monotonic_seconds();
while(clock_get_monotonic_seconds() - start_time < connect_timeout_sec) {
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struct sockaddr_un remote_addr = {0};
remote_addr.sun_family = AF_UNIX;
strncpy(remote_addr.sun_path, domain_socket_path, sizeof(remote_addr.sun_path));
// TODO: Check if parent disconnected
if(connect(socket_fd, (struct sockaddr*)&remote_addr, sizeof(remote_addr.sun_family) + strlen(remote_addr.sun_path)) == -1) {
if(errno == ECONNREFUSED || errno == ENOENT) {
goto next;
} else if(errno == EISCONN) {
connected = true;
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break;
}
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fprintf(stderr, "kms server error: connect failed, error: %s (%d)\n", strerror(errno), errno);
close(drm.drmfd);
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return 2;
}
next:
usleep(30 * 1000); // 30 milliseconds
}
if(connected) {
fprintf(stderr, "kms server info: connected to the client\n");
} else {
fprintf(stderr, "kms server error: failed to connect to the client in %f seconds\n", connect_timeout_sec);
close(drm.drmfd);
return 2;
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}
int res = 0;
for(;;) {
gsr_kms_request request;
struct iovec iov;
iov.iov_base = &request;
iov.iov_len = sizeof(request);
struct msghdr request_message = {0};
request_message.msg_iov = &iov;
request_message.msg_iovlen = 1;
const int recv_res = recvmsg(socket_fd, &request_message, MSG_WAITALL);
if(recv_res == 0) {
fprintf(stderr, "kms server info: kms client shutdown, shutting down the server\n");
res = 3;
goto done;
} else if(recv_res == -1) {
const int err = errno;
fprintf(stderr, "kms server error: failed to read all data in client request (error: %s), ignoring\n", strerror(err));
if(err == EBADF) {
fprintf(stderr, "kms server error: invalid client fd, shutting down the server\n");
res = 3;
goto done;
}
continue;
}
switch(request.type) {
case KMS_REQUEST_TYPE_GET_KMS: {
gsr_kms_response response;
if(kms_get_fb(&drm, &response) == 0) {
if(send_msg_to_client(socket_fd, &response, &response.data.fd.fd, 1) == -1)
fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_GET_KMS request\n");
close(response.data.fd.fd);
} else {
if(send_msg_to_client(socket_fd, &response, NULL, 0) == -1)
fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_GET_KMS request\n");
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}
break;
}
default: {
gsr_kms_response response;
response.result = KMS_RESULT_INVALID_REQUEST;
snprintf(response.data.err_msg, sizeof(response.data.err_msg), "invalid request type %d, expected %d (%s)", request.type, KMS_REQUEST_TYPE_GET_KMS, "KMS_REQUEST_TYPE_GET_KMS");
fprintf(stderr, "kms server error: %s\n", response.data.err_msg);
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if(send_msg_to_client(socket_fd, &response, NULL, 0) == -1) {
fprintf(stderr, "kms server error: failed to respond to client request\n");
break;
}
break;
}
}
}
done:
close(drm.drmfd);
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close(socket_fd);
return res;
}