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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "render/gbm_allocator.h"
static const struct wlr_buffer_impl buffer_impl;
static struct wlr_gbm_buffer *get_gbm_buffer_from_buffer(
struct wlr_buffer *buffer) {
assert(buffer->impl == &buffer_impl);
return (struct wlr_gbm_buffer *)buffer;
}
static bool export_gbm_bo(struct gbm_bo *bo,
struct wlr_dmabuf_attributes *out) {
struct wlr_dmabuf_attributes attribs = {0};
attribs.n_planes = gbm_bo_get_plane_count(bo);
if (attribs.n_planes > WLR_DMABUF_MAX_PLANES) {
wlr_log(WLR_ERROR, "GBM BO contains too many planes (%d)",
attribs.n_planes);
return false;
}
attribs.width = gbm_bo_get_width(bo);
attribs.height = gbm_bo_get_height(bo);
attribs.format = gbm_bo_get_format(bo);
attribs.modifier = gbm_bo_get_modifier(bo);
int i;
for (i = 0; i < attribs.n_planes; ++i) {
union gbm_bo_handle handle = gbm_bo_get_handle_for_plane(bo, i);
if (handle.s32 < 0) {
wlr_log(WLR_ERROR, "gbm_bo_get_handle_for_plane failed");
goto error_fd;
}
int drm_fd = gbm_device_get_fd(gbm_bo_get_device(bo));
int ret = drmPrimeHandleToFD(drm_fd, handle.s32,
DRM_CLOEXEC, &attribs.fd[i]);
if (ret < 0 || attribs.fd[i] < 0) {
wlr_log_errno(WLR_ERROR, "drmPrimeHandleToFD failed");
goto error_fd;
}
attribs.offset[i] = gbm_bo_get_offset(bo, i);
attribs.stride[i] = gbm_bo_get_stride_for_plane(bo, i);
}
memcpy(out, &attribs, sizeof(attribs));
return true;
error_fd:
for (int j = 0; j < i; ++j) {
close(attribs.fd[j]);
}
return false;
}
static struct wlr_gbm_buffer *create_buffer(struct wlr_gbm_allocator *alloc,
int width, int height, const struct wlr_drm_format *format) {
struct gbm_device *gbm_device = alloc->gbm_device;
struct gbm_bo *bo = NULL;
bool has_modifier = true;
if (format->len > 0) {
bo = gbm_bo_create_with_modifiers(gbm_device, width, height,
format->format, format->modifiers, format->len);
}
if (bo == NULL) {
uint32_t usage = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING;
if (format->len == 1 &&
format->modifiers[0] == DRM_FORMAT_MOD_LINEAR) {
usage |= GBM_BO_USE_LINEAR;
}
bo = gbm_bo_create(gbm_device, width, height, format->format, usage);
has_modifier = false;
}
if (bo == NULL) {
wlr_log(WLR_ERROR, "gbm_bo_create failed");
return NULL;
}
struct wlr_gbm_buffer *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
gbm_bo_destroy(bo);
return NULL;
}
wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
buffer->gbm_bo = bo;
wl_list_insert(&alloc->buffers, &buffer->link);
if (!export_gbm_bo(bo, &buffer->dmabuf)) {
free(buffer);
gbm_bo_destroy(bo);
return NULL;
}
// If the buffer has been allocated with an implicit modifier, make sure we
// don't populate the modifier field: other parts of the stack may not
// understand modifiers, and they can't strip the modifier.
if (!has_modifier) {
buffer->dmabuf.modifier = DRM_FORMAT_MOD_INVALID;
}
wlr_log(WLR_DEBUG, "Allocated %dx%d GBM buffer (format 0x%"PRIX32", "
"modifier 0x%"PRIX64")", buffer->base.width, buffer->base.height,
buffer->dmabuf.format, buffer->dmabuf.modifier);
return buffer;
}
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_gbm_buffer *buffer =
get_gbm_buffer_from_buffer(wlr_buffer);
wlr_dmabuf_attributes_finish(&buffer->dmabuf);
if (buffer->gbm_bo != NULL) {
gbm_bo_destroy(buffer->gbm_bo);
}
wl_list_remove(&buffer->link);
free(buffer);
}
static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
struct wlr_dmabuf_attributes *attribs) {
struct wlr_gbm_buffer *buffer =
get_gbm_buffer_from_buffer(wlr_buffer);
memcpy(attribs, &buffer->dmabuf, sizeof(buffer->dmabuf));
return true;
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.get_dmabuf = buffer_get_dmabuf,
};
static const struct wlr_allocator_interface allocator_impl;
static struct wlr_gbm_allocator *get_gbm_alloc_from_alloc(
struct wlr_allocator *alloc) {
assert(alloc->impl == &allocator_impl);
return (struct wlr_gbm_allocator *)alloc;
}
struct wlr_gbm_allocator *wlr_gbm_allocator_create(int fd) {
struct wlr_gbm_allocator *alloc = calloc(1, sizeof(*alloc));
if (alloc == NULL) {
return NULL;
}
wlr_allocator_init(&alloc->base, &allocator_impl);
alloc->fd = fd;
wl_list_init(&alloc->buffers);
alloc->gbm_device = gbm_create_device(fd);
if (alloc->gbm_device == NULL) {
wlr_log(WLR_ERROR, "gbm_create_device failed");
free(alloc);
return NULL;
}
wlr_log(WLR_DEBUG, "Created GBM allocator with backend %s",
gbm_device_get_backend_name(alloc->gbm_device));
return alloc;
}
static void allocator_destroy(struct wlr_allocator *wlr_alloc) {
struct wlr_gbm_allocator *alloc = get_gbm_alloc_from_alloc(wlr_alloc);
// The gbm_bo objects need to be destroyed before the gbm_device
struct wlr_gbm_buffer *buf, *buf_tmp;
wl_list_for_each_safe(buf, buf_tmp, &alloc->buffers, link) {
gbm_bo_destroy(buf->gbm_bo);
buf->gbm_bo = NULL;
wl_list_remove(&buf->link);
wl_list_init(&buf->link);
}
gbm_device_destroy(alloc->gbm_device);
close(alloc->fd);
free(alloc);
}
static struct wlr_buffer *allocator_create_buffer(
struct wlr_allocator *wlr_alloc, int width, int height,
const struct wlr_drm_format *format) {
struct wlr_gbm_allocator *alloc = get_gbm_alloc_from_alloc(wlr_alloc);
struct wlr_gbm_buffer *buffer = create_buffer(alloc, width, height, format);
if (buffer == NULL) {
return NULL;
}
return &buffer->base;
}
static const struct wlr_allocator_interface allocator_impl = {
.destroy = allocator_destroy,
.create_buffer = allocator_create_buffer,
};
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