>
> My requirement:
> 1. support non-contiguous memory allocation as GPU buffer
> 2. support contiguous memory allocation too for exporting to some
> display DRM driver as framebuffer
btw, I think etnaviv deals w/ contiguous scanout buffer by just
importing the scanout buffer from the other display drm driver. So I
think you could avoid having to allocate these buffers.
Right, after looking at the renderonly lib of imx+etnaviv, it create dumb
buffer at display DRM and export to etnaviv. With this method, seems
lima just need to support non-contiguous memory allocation.
Thanks,
Qiang
> ______________________________
> 3. no GPU page fault for better performance and avoid multi MMU
> page fault handling, CPU page fault is OK
> 4. better have buffer swap to disk feature when memory is full
>
> Current MM:
> 1. drm_gem_cma_object, only support contiguous memory
> 2. drm_gem_get_pages
> 1) need to combine with cma method for contiguous memory
> 2) when shrink is needed, swap some idle buffer to disk and put
> pages, need implement by myself
> 3) additional shmem layer introduced
> 3. TTM TTM_PL_SYSTEM only
> 1) no contiguous memory support
> 2) too complicated as we don't need other functions of TTM
> 3) need GPU page fault to populate memory?
> 4) no page pool for cached memory
>
> My plan:
> 1. for contiguous memory allocation use dma_alloc_*
> 2. for non-contiguous memory allocation, use a page pool from
> alloc_page
> 3. buffer is not really allocated when GEM_CREATE, but in CPU
> page fault handler and task submit buffer validation which make
> sure no GPU page fault
> 4. in shrinker handler, free un-used page in the pool, if still not
> enough, swap some idle buffer to disk
>
> 3&4 apply to both dma_alloc buffer and alloc_page buffer.
>
> Thanks,
> Qiang
>
>
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