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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/render/allocator.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "backend/backend.h"
#include "render/allocator/allocator.h"
#include "render/allocator/drm_dumb.h"
#include "render/allocator/gbm.h"
#include "render/allocator/shm.h"
#include "render/wlr_renderer.h"
void wlr_allocator_init(struct wlr_allocator *alloc,
const struct wlr_allocator_interface *impl, uint32_t buffer_caps) {
assert(impl && impl->destroy && impl->create_buffer);
alloc->impl = impl;
alloc->buffer_caps = buffer_caps;
wl_signal_init(&alloc->events.destroy);
}
/* Re-open the DRM node to avoid GEM handle ref'counting issues. See:
* https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110
*/
static int reopen_drm_node(int drm_fd, bool allow_render_node) {
if (drmIsMaster(drm_fd)) {
// Only recent kernels support empty leases
uint32_t lessee_id;
int lease_fd = drmModeCreateLease(drm_fd, NULL, 0, 0, &lessee_id);
if (lease_fd >= 0) {
return lease_fd;
} else if (lease_fd != -EINVAL && lease_fd != -EOPNOTSUPP) {
wlr_log_errno(WLR_ERROR, "drmModeCreateLease failed");
return -1;
}
wlr_log(WLR_DEBUG, "drmModeCreateLease failed, "
"falling back to plain open");
}
char *name = NULL;
if (allow_render_node) {
name = drmGetRenderDeviceNameFromFd(drm_fd);
}
if (name == NULL) {
// Either the DRM device has no render node, either the caller wants
// a primary node
name = drmGetDeviceNameFromFd2(drm_fd);
if (name == NULL) {
wlr_log(WLR_ERROR, "drmGetDeviceNameFromFd2 failed");
return -1;
}
}
int new_fd = open(name, O_RDWR | O_CLOEXEC);
if (new_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open DRM node '%s'", name);
free(name);
return -1;
}
free(name);
// If we're using a DRM primary node (e.g. because we're running under the
// DRM backend, or because we're on split render/display machine), we need
// to use the legacy DRM authentication mechanism to have the permission to
// manipulate buffers.
if (drmGetNodeTypeFromFd(new_fd) == DRM_NODE_PRIMARY) {
drm_magic_t magic;
if (drmGetMagic(new_fd, &magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmGetMagic failed");
close(new_fd);
return -1;
}
if (drmAuthMagic(drm_fd, magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmAuthMagic failed");
close(new_fd);
return -1;
}
}
return new_fd;
}
struct wlr_allocator *allocator_autocreate_with_drm_fd(
struct wlr_backend *backend, struct wlr_renderer *renderer,
int drm_fd) {
uint32_t backend_caps = backend_get_buffer_caps(backend);
uint32_t renderer_caps = renderer_get_render_buffer_caps(renderer);
struct wlr_allocator *alloc = NULL;
uint32_t gbm_caps = WLR_BUFFER_CAP_DMABUF;
if ((backend_caps & gbm_caps) && (renderer_caps & gbm_caps)
&& drm_fd >= 0) {
wlr_log(WLR_DEBUG, "Trying to create gbm allocator");
int gbm_fd = reopen_drm_node(drm_fd, true);
if (gbm_fd < 0) {
return NULL;
}
if ((alloc = wlr_gbm_allocator_create(gbm_fd)) != NULL) {
return alloc;
}
close(gbm_fd);
wlr_log(WLR_DEBUG, "Failed to create gbm allocator");
}
uint32_t shm_caps = WLR_BUFFER_CAP_SHM | WLR_BUFFER_CAP_DATA_PTR;
if ((backend_caps & shm_caps) && (renderer_caps & shm_caps)) {
wlr_log(WLR_DEBUG, "Trying to create shm allocator");
if ((alloc = wlr_shm_allocator_create()) != NULL) {
return alloc;
}
wlr_log(WLR_DEBUG, "Failed to create shm allocator");
}
uint32_t drm_caps = WLR_BUFFER_CAP_DMABUF | WLR_BUFFER_CAP_DATA_PTR;
if ((backend_caps & drm_caps) && (renderer_caps & drm_caps)
&& drm_fd >= 0 && drmIsMaster(drm_fd)) {
wlr_log(WLR_DEBUG, "Trying to create drm dumb allocator");
int dumb_fd = reopen_drm_node(drm_fd, false);
if (dumb_fd < 0) {
return NULL;
}
if ((alloc = wlr_drm_dumb_allocator_create(dumb_fd)) != NULL) {
return alloc;
}
close(dumb_fd);
wlr_log(WLR_DEBUG, "Failed to create drm dumb allocator");
}
wlr_log(WLR_ERROR, "Failed to create allocator");
return NULL;
}
struct wlr_allocator *wlr_allocator_autocreate(struct wlr_backend *backend,
struct wlr_renderer *renderer) {
// Note, drm_fd may be negative if unavailable
int drm_fd = wlr_backend_get_drm_fd(backend);
return allocator_autocreate_with_drm_fd(backend, renderer, drm_fd);
}
void wlr_allocator_destroy(struct wlr_allocator *alloc) {
if (alloc == NULL) {
return;
}
wl_signal_emit(&alloc->events.destroy, NULL);
alloc->impl->destroy(alloc);
}
struct wlr_buffer *wlr_allocator_create_buffer(struct wlr_allocator *alloc,
int width, int height, const struct wlr_drm_format *format) {
struct wlr_buffer *buffer =
alloc->impl->create_buffer(alloc, width, height, format);
if (buffer == NULL) {
return NULL;
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_DATA_PTR) {
assert(buffer->impl->begin_data_ptr_access &&
buffer->impl->end_data_ptr_access);
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_DMABUF) {
assert(buffer->impl->get_dmabuf);
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_SHM) {
assert(buffer->impl->get_shm);
}
return buffer;
}
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