wlroots/render/allocator/drm_dumb.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <wlr/backend.h>
#include <wlr/backend/session.h>
#include <wlr/render/allocator.h>
#include <wlr/render/drm_format_set.h>
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#include <wlr/util/log.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "render/allocator/drm_dumb.h"
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#include "render/pixel_format.h"
static const struct wlr_buffer_impl buffer_impl;
static struct wlr_drm_dumb_buffer *drm_dumb_buffer_from_buffer(
struct wlr_buffer *wlr_buf) {
assert(wlr_buf->impl == &buffer_impl);
return (struct wlr_drm_dumb_buffer *)wlr_buf;
}
static void finish_buffer(struct wlr_drm_dumb_buffer *buf) {
if (buf->data) {
munmap(buf->data, buf->size);
}
wlr_dmabuf_attributes_finish(&buf->dmabuf);
if (buf->drm_fd >= 0) {
struct drm_mode_destroy_dumb destroy = { .handle = buf->handle };
if (drmIoctl(buf->drm_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy)) {
wlr_log_errno(WLR_ERROR, "Failed to destroy DRM dumb buffer");
}
}
wl_list_remove(&buf->link);
}
static struct wlr_drm_dumb_buffer *create_buffer(
struct wlr_drm_dumb_allocator *alloc, int width, int height,
const struct wlr_drm_format *format) {
struct wlr_drm_dumb_buffer *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
return NULL;
}
wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
wl_list_insert(&alloc->buffers, &buffer->link);
const struct wlr_pixel_format_info *info =
drm_get_pixel_format_info(format->format);
if (info == NULL) {
wlr_log(WLR_ERROR, "DRM format 0x%"PRIX32" not supported",
format->format);
goto create_err;
}
struct drm_mode_create_dumb create = {0};
create.width = (uint32_t)width;
create.height = (uint32_t)height;
create.bpp = info->bpp;
if (drmIoctl(alloc->drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to create DRM dumb buffer");
goto create_err;
}
buffer->width = create.width;
buffer->height = create.height;
buffer->stride = create.pitch;
buffer->handle = create.handle;
buffer->format = format->format;
buffer->drm_fd = alloc->drm_fd;
struct drm_mode_map_dumb map = {0};
map.handle = buffer->handle;
if (drmIoctl(alloc->drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to map DRM dumb buffer");
goto create_destroy;
}
buffer->data = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED,
alloc->drm_fd, map.offset);
if (buffer->data == MAP_FAILED) {
wlr_log_errno(WLR_ERROR, "Failed to mmap DRM dumb buffer");
goto create_destroy;
}
buffer->size = create.size;
memset(buffer->data, 0, create.size);
int prime_fd;
if (drmPrimeHandleToFD(alloc->drm_fd, buffer->handle, DRM_CLOEXEC,
&prime_fd) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to get PRIME handle from GEM handle");
goto create_destroy;
}
buffer->dmabuf = (struct wlr_dmabuf_attributes){
.width = buffer->width,
.height = buffer->height,
.format = format->format,
.modifier = DRM_FORMAT_MOD_INVALID,
.n_planes = 1,
.offset[0] = 0,
.stride[0] = buffer->stride,
.fd[0] = prime_fd,
};
wlr_log(WLR_DEBUG, "Allocated %"PRIu32"x%"PRIu32" DRM dumb buffer",
buffer->width, buffer->height);
return buffer;
create_destroy:
finish_buffer(buffer);
create_err:
free(buffer);
return NULL;
}
static bool drm_dumb_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
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struct wlr_drm_dumb_buffer *buf = drm_dumb_buffer_from_buffer(wlr_buffer);
*data = buf->data;
*stride = buf->stride;
*format = buf->format;
return true;
}
static void drm_dumb_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
// This space is intentionally left blank
}
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static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
struct wlr_dmabuf_attributes *attribs) {
struct wlr_drm_dumb_buffer *buf = drm_dumb_buffer_from_buffer(wlr_buffer);
memcpy(attribs, &buf->dmabuf, sizeof(buf->dmabuf));
return true;
}
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_drm_dumb_buffer *buf = drm_dumb_buffer_from_buffer(wlr_buffer);
finish_buffer(buf);
free(buf);
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.get_dmabuf = buffer_get_dmabuf,
.begin_data_ptr_access = drm_dumb_buffer_begin_data_ptr_access,
.end_data_ptr_access = drm_dumb_buffer_end_data_ptr_access,
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};
static const struct wlr_allocator_interface allocator_impl;
static struct wlr_drm_dumb_allocator *drm_dumb_alloc_from_alloc(
struct wlr_allocator *wlr_alloc) {
assert(wlr_alloc->impl == &allocator_impl);
return (struct wlr_drm_dumb_allocator *)wlr_alloc;
}
static struct wlr_buffer *allocator_create_buffer(
struct wlr_allocator *wlr_alloc, int width, int height,
const struct wlr_drm_format *drm_format) {
struct wlr_drm_dumb_allocator *alloc = drm_dumb_alloc_from_alloc(wlr_alloc);
struct wlr_drm_dumb_buffer *buffer = create_buffer(alloc, width, height,
drm_format);
if (buffer == NULL) {
return NULL;
}
return &buffer->base;
}
static void allocator_destroy(struct wlr_allocator *wlr_alloc) {
struct wlr_drm_dumb_allocator *alloc = drm_dumb_alloc_from_alloc(wlr_alloc);
struct wlr_drm_dumb_buffer *buf, *buf_tmp;
wl_list_for_each_safe(buf, buf_tmp, &alloc->buffers, link) {
buf->drm_fd = -1;
wl_list_remove(&buf->link);
wl_list_init(&buf->link);
}
close(alloc->drm_fd);
free(alloc);
}
static const struct wlr_allocator_interface allocator_impl = {
.create_buffer = allocator_create_buffer,
.destroy = allocator_destroy,
};
struct wlr_allocator *wlr_drm_dumb_allocator_create(int drm_fd) {
if (drmGetNodeTypeFromFd(drm_fd) != DRM_NODE_PRIMARY) {
wlr_log(WLR_ERROR, "Cannot use DRM dumb buffers with non-primary DRM FD");
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return NULL;
}
uint64_t has_dumb = 0;
if (drmGetCap(drm_fd, DRM_CAP_DUMB_BUFFER, &has_dumb) < 0) {
wlr_log(WLR_ERROR, "Failed to get DRM capabilities");
return NULL;
}
if (has_dumb == 0) {
wlr_log(WLR_ERROR, "DRM dumb buffers not supported");
return NULL;
}
struct wlr_drm_dumb_allocator *alloc = calloc(1, sizeof(*alloc));
if (alloc == NULL) {
return NULL;
}
wlr_allocator_init(&alloc->base, &allocator_impl,
WLR_BUFFER_CAP_DATA_PTR | WLR_BUFFER_CAP_DMABUF);
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alloc->drm_fd = drm_fd;
wl_list_init(&alloc->buffers);
wlr_log(WLR_DEBUG, "Created DRM dumb allocator");
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return &alloc->base;
}