diff options
Diffstat (limited to 'kms++/src/dmabufframebuffer.cpp')
| -rw-r--r-- | kms++/src/dmabufframebuffer.cpp | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/kms++/src/dmabufframebuffer.cpp b/kms++/src/dmabufframebuffer.cpp index cdf7a74..00ab94e 100644 --- a/kms++/src/dmabufframebuffer.cpp +++ b/kms++/src/dmabufframebuffer.cpp @@ -4,8 +4,10 @@ #include <stdexcept> #include <sys/mman.h> +#include <sys/ioctl.h> #include <xf86drm.h> #include <xf86drmMode.h> +#include <linux/dma-buf.h> #include <kms++/kms++.h> @@ -78,4 +80,50 @@ int DmabufFramebuffer::prime_fd(unsigned plane) return p.prime_fd; } +void DmabufFramebuffer::begin_cpu_access(CpuAccess access) +{ + if (m_sync_flags != 0) + throw runtime_error("begin_cpu sync already started"); + + switch (access) { + case CpuAccess::Read: + m_sync_flags = DMA_BUF_SYNC_READ; + break; + case CpuAccess::Write: + m_sync_flags = DMA_BUF_SYNC_WRITE; + break; + case CpuAccess::ReadWrite: + m_sync_flags = DMA_BUF_SYNC_RW; + break; + } + + dma_buf_sync dbs { + .flags = DMA_BUF_SYNC_START | m_sync_flags + }; + + for (uint32_t p = 0; p < m_num_planes; ++p) { + int r = ioctl(prime_fd(p), DMA_BUF_IOCTL_SYNC, &dbs); + if (r) + throw runtime_error("DMA_BUF_IOCTL_SYNC failed"); + } +} + +void DmabufFramebuffer::end_cpu_access() +{ + if (m_sync_flags == 0) + throw runtime_error("begin_cpu sync not started"); + + dma_buf_sync dbs { + .flags = DMA_BUF_SYNC_END | m_sync_flags + }; + + for (uint32_t p = 0; p < m_num_planes; ++p) { + int r = ioctl(prime_fd(p), DMA_BUF_IOCTL_SYNC, &dbs); + if (r) + throw runtime_error("DMA_BUF_IOCTL_SYNC failed"); + } + + m_sync_flags = 0; +} + } |