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/* SPDX-License-Identifier: MIT */
#include "drm++/gem.hpp"
#include "drm++/helper.hpp"
#include "drm++/ioctl.hpp"
#include <cassert>
#include <cerrno>
#include <stdexcept>
#include <system_error>
#include <utility>
#include <drm.h>
#include <drm_mode.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
using namespace drm;
using namespace drm::gem;
/* GEM object class */
Object::Object(ObjectManager& manager, int dmabuf_fd, bool close) : m_manager(&manager) {
try {
drm_prime_handle args{
.fd = dmabuf_fd
};
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, args);
this->m_handle = args.handle;
this->m_manager->m_refcounts[this->m_handle]++;
} catch (...) {
if (close) {
::close(dmabuf_fd);
}
throw;
}
if (close) {
::close(dmabuf_fd);
}
}
int Object::exportFd(ExportFlags flags) const {
drm_prime_handle args{
.handle = this->m_handle,
.flags = static_cast<u32>(flags)
};
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, args);
return args.fd;
}
void Object::changeHandle(u32 handle) {
auto& refcounts{this->m_manager->m_refcounts};
if (refcounts[handle] > 0 || refcounts[this->m_handle] > 1) {
throw std::logic_error("GEM handle is still in use");
}
drm_gem_change_handle args{
.handle = this->m_handle,
.new_handle = handle
};
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_GEM_CHANGE_HANDLE, args);
std::exchange(refcounts[handle], refcounts[this->m_handle]);
this->m_handle = handle;
}
void Object::destruct() noexcept {
if (this->m_manager == nullptr) {
return;
}
auto& refcounts{this->m_manager->m_refcounts};
if (refcounts[this->m_handle] > 1) {
refcounts[this->m_handle]--;
this->m_manager = nullptr;
return;
}
drm_gem_close args{
.handle = this->m_handle
};
try {
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_GEM_CLOSE, args);
} catch(...) {
assert(false && "GEM close failed, memory leak likely");
}
this->m_manager = nullptr;
}
/* Dumb buffer class */
DumbBuffer::DumbBuffer(ObjectManager& manager, u32 width, u32 height, u32 bpp)
: Object(manager), m_width(width), m_height(height), m_bpp(bpp) {
drm_mode_create_dumb args{
.height = height,
.width = width,
.bpp = bpp
};
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_MODE_CREATE_DUMB, args);
this->m_handle = args.handle;
this->m_manager->m_refcounts[this->m_handle]++;
this->m_pitch = args.pitch;
this->m_size = args.size;
}
void* DumbBuffer::map() {
if (this->m_map != nullptr) {
return this->m_map;
}
drm_mode_map_dumb args{
.handle = this->m_handle
};
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_MODE_MAP_DUMB, args);
void* map{::mmap(nullptr, this->m_size, PROT_READ | PROT_WRITE, MAP_SHARED,
this->m_manager->m_fd, static_cast<off_t>(args.offset))};
if (map == MAP_FAILED) {
throw std::system_error(errno, std::generic_category(), "mmap failed");
}
this->m_map = map;
return this->m_map;
}
void DumbBuffer::destruct() noexcept {
if (this->m_manager == nullptr) {
return;
}
auto& refcounts{this->m_manager->m_refcounts};
if (refcounts[this->m_handle] > 1) {
refcounts[this->m_handle]--;
this->m_manager = nullptr;
return;
}
if (this->m_map != nullptr) {
::munmap(this->m_map, this->m_size);
this->m_map = nullptr;
}
drm_mode_destroy_dumb args{
.handle = this->m_handle
};
try {
ioctl::perform(this->m_manager->m_fd, DRM_IOCTL_MODE_DESTROY_DUMB, args);
} catch(...) {
assert(false && "Dumb buffer destroy failed, memory leak likely");
}
this->m_manager = nullptr;
}
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