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kms: get plane every frame, might fix not updating issue and issue where plane gets invalid

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This commit is contained in:
dec05eba
2023-04-10 02:25:43 +02:00
parent 9bdbca864d
commit dddd426904
7 changed files with 297 additions and 271 deletions
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235
kms/server/kms_server.c
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@@ -16,6 +16,11 @@
#define DRM_CLIENT_CAP_UNIVERSAL_PLANES 2
typedef struct {
int drmfd;
uint32_t plane_id;
} gsr_drm;
static int max_int(int a, int b) {
return a > b ? a : b;
}
@@ -57,99 +62,135 @@ static int send_msg_to_client(int client_fd, gsr_kms_response *response, int *fd
return sendmsg(client_fd, &response_message, 0);
}
static int get_kms(const char *card_path, gsr_kms_response *response) {
static int kms_get_plane_id(gsr_drm *drm) {
drmModePlaneResPtr planes = NULL;
drmModePlanePtr plane = NULL;
drmModeFB2Ptr drmfb = NULL;
int result = -1;
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;
}
planes = drmModeGetPlaneResources(drm->drmfd);
if(!planes) {
fprintf(stderr, "kms server error: failed to access planes, error: %s\n", strerror(errno));
goto error;
}
for(uint32_t i = 0; i < planes->count_planes; ++i) {
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);
continue;
}
if(!plane->fb_id) {
drmModeFreePlane(plane);
continue;
}
break;
}
if(!plane) {
fprintf(stderr, "kms server error: failed to find a usable plane\n");
goto error;
}
// TODO: Fallback to getfb(1)?
drmfb = drmModeGetFB2(drm->drmfd, plane->fb_id);
if(!drmfb) {
fprintf(stderr, "kms server error: drmModeGetFB2 failed on plane fb id %d, error: %s\n", plane->fb_id, strerror(errno));
goto error;
}
if(!drmfb->handles[0]) {
fprintf(stderr, "kms server error: drmfb handle is NULL\n");
goto error;
}
drm->plane_id = plane->plane_id;
result = 0;
error:
if(drmfb)
drmModeFreeFB2(drmfb);
if(plane)
drmModeFreePlane(plane);
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;
const int drmfd = open(card_path, O_RDONLY);
if (drmfd < 0) {
response->result = KMS_RESULT_FAILED_TO_OPEN_CARD;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to open %s, error: %s", card_path, strerror(errno));
return -1;
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;
}
if (0 != drmSetClientCap(drmfd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
response->result = KMS_RESULT_INSUFFICIENT_PERMISSIONS;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "drmSetClientCap failed, error: %s", strerror(errno));
close(drmfd);
return -1;
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;
}
drmModePlaneResPtr planes = drmModeGetPlaneResources(drmfd);
if (!planes) {
response->result = KMS_RESULT_FAILED_TO_GET_KMS;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to access planes, error: %s", strerror(errno));
close(drmfd);
return -1;
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;
}
fprintf(stderr, "DRM planes %d:\n", planes->count_planes);
for (uint32_t i = 0; i < planes->count_planes; ++i) {
drmModePlanePtr plane = drmModeGetPlane(drmfd, planes->planes[i]);
if (!plane) {
fprintf(stderr, "Cannot get drmModePlanePtr for plane %#x: %s (%d)\n", planes->planes[i], strerror(errno), errno);
continue;
}
// 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).
fprintf(stderr, "\t%d: fb_id=%#x\n", i, plane->fb_id);
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;
}
if (!plane->fb_id)
goto plane_continue;
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;
drmModeFB2Ptr drmfb = drmModeGetFB2(drmfd, plane->fb_id);
if (!drmfb) {
fprintf(stderr, "Cannot get drmModeFBPtr for fb %#x: %s (%d)\n", plane->fb_id, strerror(errno), errno);
} else {
if (!drmfb->handles[0]) {
fprintf(stderr, "\t\tFB handle for fb %#x is NULL\n", plane->fb_id);
fprintf(stderr, "\t\tPossible reason: not permitted to get FB handles. Do `sudo setcap cap_sys_admin+ep`\n");
} else {
int fb_fd = -1;
const int ret = drmPrimeHandleToFD(drmfd, drmfb->handles[0], 0, &fb_fd);
if (ret != 0 || fb_fd == -1) {
fprintf(stderr, "Cannot get fd for fb %#x handle %#x: %s (%d)\n", plane->fb_id, drmfb->handles[0], strerror(errno), errno);
} else if(drmfb->width * drmfb->height > response->data.fd.width * response->data.fd.height) {
if(response->data.fd.fd != 0) {
close(response->data.fd.fd);
response->data.fd.fd = 0;
}
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;
fprintf(stderr, "kms width: %u, height: %u, pixel format: %u, modifier: %lu\n", response->data.fd.width, response->data.fd.height, response->data.fd.pixel_format, response->data.fd.modifier);
} else {
close(fb_fd);
}
}
drmModeFreeFB2(drmfb);
}
plane_continue:
error:
if(drmfb)
drmModeFreeFB2(drmfb);
if(plane)
drmModeFreePlane(plane);
}
drmModeFreePlaneResources(planes);
close(drmfd);
if(response->data.fd.fd == 0) {
response->result = KMS_RESULT_NO_KMS_AVAILABLE;
snprintf(response->data.err_msg, sizeof(response->data.err_msg), "no kms found");
return -1;
}
return 0;
return result;
}
int main(int argc, char **argv) {
if(argc != 2) {
fprintf(stderr, "usage: kms_server <domain_socket_path>\n");
if(argc != 3) {
fprintf(stderr, "usage: kms_server <domain_socket_path> <card_path>\n");
return 1;
}
@@ -160,7 +201,22 @@ int main(int argc, char **argv) {
return 2;
}
fprintf(stderr, "kms server info: connecting to the server\n");
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");
for(;;) {
struct sockaddr_un remote_addr = {0};
remote_addr.sun_family = AF_UNIX;
@@ -171,11 +227,13 @@ int main(int argc, char **argv) {
continue; // Host not ready yet? TODO: sleep
if(errno == EISCONN) // TODO?
break;
fprintf(stderr, "kms server error: connect failed, error: %s (%d)\n", strerror(errno), errno);
close(drm.drmfd);
return 2;
}
}
fprintf(stderr, "kms server info: connected to the server\n");
fprintf(stderr, "kms server info: connected to the client\n");
int res = 0;
for(;;) {
@@ -202,33 +260,27 @@ int main(int argc, char **argv) {
}
continue;
}
request.data.card_path[254] = '\0';
switch(request.type) {
case KMS_REQUEST_TYPE_GET_KMS: {
gsr_kms_response response;
int kms_fd = 0;
if (get_kms(request.data.card_path, &response) == 0) {
kms_fd = response.data.fd.fd;
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");
}
if(send_msg_to_client(socket_fd, &response, &kms_fd, kms_fd == 0 ? 0 : 1) == -1) {
fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_GET_KMS request\n");
if(kms_fd != 0)
close(kms_fd);
break;
}
if(kms_fd != 0)
close(kms_fd);
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, "%s\n", response.data.err_msg);
fprintf(stderr, "kms server error: %s\n", response.data.err_msg);
if(send_msg_to_client(socket_fd, &response, NULL, 0) == -1) {
fprintf(stderr, "kms server error: failed to respond to client request\n");
break;
@@ -239,6 +291,7 @@ int main(int argc, char **argv) {
}
done:
close(drm.drmfd);
close(socket_fd);
return res;
}