[Mesa-dev] Question about display_gpu and render gpu in dri3_create_screen

[Luc Ma]

Hello,

I recently tried multi-GPU support on the mesa gallium drivers(glx=dri).
When I exported the env `DRI_PRIME=1`, I found that it didn't work with two
different drivers loaded at the same time.
because there are different driver names in my case. display_gpu driver
name is "r600" while render_gpu driver name is "nouveau". It failed to
create display gpu screen

if (strcmp(driverName, driverNameDisplayGPU) == 0) {
            psc->driScreenDisplayGPU =
               psc->image_driver->createNewScreen2(screen,
psc->fd_display_gpu,
                                                   pdp->loader_extensions,
                                                   extensions,
                                                   &driver_configs, psc);
}

so I am wondering

- is it possible to use two GPUs from different vendors on a system with
gallium? one is for display, another for rendering
- is it possible to use two GPUs driven by a shared driver(say both "r600")
on a system?


Thanks,

Luc