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