On 11 November 2014 07:33, Rian Quinn <rianquinn@xxxxxxxxx> wrote:
> I would be surprised if the size argument was the issue. That comes right
> out out of the create IOCTL unmodified. Here is the full source that I am
> using.
>
> // Clear the arg buffers.
> memset(&create_arg, 0, sizeof(create_arg));
> memset(&map_arg, 0, sizeof(map_arg));
>
> //
> ------------------------------------------------------------------------
> // Allocate
>
> // Fill in the arguments for the IOCTL. Note that we only support 32bpp
> // dumb buffers so that is hard coded here.
> create_arg.width = width;
> create_arg.height = height;
> create_arg.bpp = 32;
>
> // Allocate the dumb buffer
> if (drmIoctl(gpu->fd(), DRM_IOCTL_MODE_CREATE_DUMB, &create_arg))
> {
> svWarning(0) << "Failed: DRM_IOCTL_MODE_CREATE_DUMB - " <<
> strerror(errno);
> return;
> }
>
> // Store the dumb buffer properties.
> mSize = create_arg.size;
> mStride = create_arg.pitch;
> mHandle = create_arg.handle;
>
> //
> ------------------------------------------------------------------------
> // Map
>
> // Fill in the arguments for the IOCTL.
> map_arg.handle = mHandle;
>
> // Allocate the dumb buffer
> if (drmIoctl(gpu->fd(), DRM_IOCTL_MODE_MAP_DUMB, &map_arg))
> {
> svWarning(0) << "Failed: DRM_IOCTL_MODE_MAP_DUMB - " <<
> strerror(errno);
> return;
> }
>
> // Store the mapped memory
> if ((mVaddr = (svuint32 *)mmap(0, mSize, PROT_READ | PROT_WRITE,
> MAP_SHARED, gpu->fd(), map_arg.offset)) == MAP_FAILED)
> {
> // Need to clear out the address so that we don't try to use it.
> mVaddr = NULL;
>
> // Error out.
> svWarning(0) << "Failed: Dumb Buffer mmap - " << strerror(errno);
> return;
> }
>
mmap is probably truncating the offset,
look into,
#define _FILE_OFFSET_BITS 64
AC_SYS_LARGEFILE
Dave.
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