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#undef _POSIX_C_SOURCE
#define _GNU_SOURCE // for memfd_create() and F_ADD_SEALS
#include <drm_fourcc.h>
#include <fcntl.h>
#include <linux/udmabuf.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <wlr/interfaces/wlr_buffer.h>
#include <wlr/render/allocator.h>
#include <wlr/render/drm_format_set.h>
#include <wlr/util/log.h>
#include "render/allocator/udmabuf.h"
#include "render/pixel_format.h"
static bool buffer_get_shm(struct wlr_buffer *wlr_buffer, struct wlr_shm_attributes *shm) {
struct wlr_udmabuf_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
*shm = buffer->shm;
return true;
}
static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer, struct wlr_dmabuf_attributes *dmabuf) {
struct wlr_udmabuf_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
*dmabuf = buffer->dmabuf;
return true;
}
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_udmabuf_buffer *buffer = wl_container_of(wlr_buffer, buffer, base);
wlr_dmabuf_attributes_finish(&buffer->dmabuf);
close(buffer->shm.fd);
free(buffer);
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.get_shm = buffer_get_shm,
.get_dmabuf = buffer_get_dmabuf,
};
static struct wlr_buffer *allocator_create_buffer(
struct wlr_allocator *wlr_allocator, int width, int height,
const struct wlr_drm_format *format) {
struct wlr_udmabuf_allocator *allocator = wl_container_of(wlr_allocator, allocator, base);
const struct wlr_pixel_format_info *info =
drm_get_pixel_format_info(format->format);
if (info == NULL) {
wlr_log(WLR_ERROR, "Unsupported pixel format 0x%"PRIX32, format->format);
return NULL;
}
long page_size = sysconf(_SC_PAGE_SIZE);
if (page_size == -1) {
wlr_log_errno(WLR_ERROR, "Failed to query page size");
return NULL;
}
struct wlr_udmabuf_buffer *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
return NULL;
}
wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
// TODO: consider using a single file for multiple buffers
int stride = pixel_format_info_min_stride(info, width); // TODO: align?
size_t size = stride * height;
if (size % page_size != 0) {
size += page_size - (size % page_size);
}
int memfd = memfd_create("wlroots", MFD_CLOEXEC | MFD_ALLOW_SEALING);
if (memfd < 0) {
wlr_log_errno(WLR_ERROR, "memfd_create() failed");
goto err_buffer;
}
if (ftruncate(memfd, size) < 0) {
wlr_log_errno(WLR_ERROR, "ftruncate() failed");
goto err_memfd;
}
if (fcntl(memfd, F_ADD_SEALS, F_SEAL_SEAL | F_SEAL_SHRINK) < 0) {
wlr_log_errno(WLR_ERROR, "fcntl(F_ADD_SEALS) failed");
goto err_memfd;
}
struct udmabuf_create udmabuf_create = {
.memfd = memfd,
.flags = UDMABUF_FLAGS_CLOEXEC,
.offset = 0,
.size = size,
};
int dmabuf_fd = ioctl(allocator->fd, UDMABUF_CREATE, &udmabuf_create);
if (dmabuf_fd < 0) {
wlr_log_errno(WLR_ERROR, "ioctl(UDMABUF_CREATE) failed");
goto err_memfd;
}
buffer->size = size;
buffer->shm = (struct wlr_shm_attributes){
.width = width,
.height = height,
.format = format->format,
.offset = 0,
.stride = stride,
.fd = memfd,
};
buffer->dmabuf = (struct wlr_dmabuf_attributes){
.width = width,
.height = height,
.format = format->format,
.modifier = DRM_FORMAT_MOD_LINEAR,
.n_planes = 1,
.offset[0] = 0,
.stride[0] = stride,
.fd[0] = dmabuf_fd,
};
return &buffer->base;
err_memfd:
close(memfd);
err_buffer:
free(buffer);
return NULL;
}
static void allocator_destroy(struct wlr_allocator *wlr_allocator) {
struct wlr_udmabuf_allocator *allocator = wl_container_of(wlr_allocator, allocator, base);
close(allocator->fd);
free(allocator);
}
static const struct wlr_allocator_interface allocator_impl = {
.destroy = allocator_destroy,
.create_buffer = allocator_create_buffer,
};
struct wlr_allocator *wlr_udmabuf_allocator_create(void) {
int fd = open("/dev/udmabuf", O_RDWR | O_CLOEXEC);
if (fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open /dev/udmabuf");
return NULL;
}
struct wlr_udmabuf_allocator *allocator = calloc(1, sizeof(*allocator));
if (allocator == NULL) {
close(fd);
return NULL;
}
wlr_allocator_init(&allocator->base, &allocator_impl,
WLR_BUFFER_CAP_SHM | WLR_BUFFER_CAP_DMABUF);
allocator->fd = fd;
return &allocator->base;
}
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