On Wed, 16 Feb 2022 at 14:13, Sui Jingfeng <15330273260@xxxxxx> wrote: > On 2022/2/16 21:46, Daniel Stone wrote: > > Other systems have this limitation, and Mesa's 'kmsro' concept makes > > this work transparently, as long as your driver can export dmabufs > > when running in 'VRAM' mode. > > When using vram helper based driver, the framebuffer is locate at video > ram. the backing memory fb is manage by TTM. > > while bo of etnaviv is locate at system ram. Currently i can't figure > out how does the buffer going to be shared. kmsro will allocate from the KMS device (usually using dumb buffers), export that BO as a dmabuf, then import into etnaviv. etnaviv already uses this for imx-drm. Cheers, Daniel
