dmabufbufferimpl.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_DMABUF
#include <cstdint>
#include <promeki/namespace.h>
#include <promeki/bufferimpl.h>
#include <promeki/buffercommand.h>
#include <promeki/mutex.h>
#include <promeki/error.h>
 
PROMEKI_NAMESPACE_BEGIN
 
enum class DmabufFdOwnership {
        Dup,
        Adopt,
};
 
class DmabufBufferImpl : public BufferImpl {
        public:
                PROMEKI_SHARED_DERIVED(DmabufBufferImpl)
 
                
                DmabufBufferImpl(const MemSpace &ms, int fd, size_t bytes, size_t align, DmabufFdOwnership ownership);
 
                ~DmabufBufferImpl() override;
 
                MemSpace memSpace() const override { return _memSpace; }
                size_t   allocSize() const override { return _allocSize; }
                size_t   align() const override { return _align; }
 
                int dmabufFd() const { return _fd; }
 
                void *mappedHostData() const override { return _hostMap; }
 
                BufferRequest mapAcquire(MemDomain domain, MapFlags flags) override;
                BufferRequest mapRelease(MemDomain domain) override;
 
                Error fill(char value, size_t offset, size_t bytes) override;
 
                Error copyFromHost(const void *src, size_t bytes, size_t offset) override;
 
                bool canClone() const override { return false; }
 
        private:
                void dmabufSync(uint64_t syncFlags) const;
 
                int      _fd          = -1;
                size_t   _allocSize   = 0;
                size_t   _align       = 0;
                MemSpace _memSpace;
 
                // Guards the lazy host mmap and the Host-domain refcount
                // 0<->1 transitions so mmap/munmap happen exactly once.
                mutable Mutex _hostMutex;
                void         *_hostMap       = nullptr;
                uint64_t      _hostSyncFlags = 0; // DMA_BUF_SYNC_READ/WRITE bits in effect
};
 
PROMEKI_NAMESPACE_END
 
#endif // PROMEKI_ENABLE_DMABUF