Re: [PATCH] drm/nouveau: fix TTM_PL_TT memtype on pre-nv50

[Maarten Lankhorst <maarten.lankhorst@canonical.com>]

op 16-02-14 05:27, Ilia Mirkin schreef:
> Commit a55409066 ("drm/nv50-: map TTM_PL_SYSTEM through a BAR for CPU
> access") made it possible to work with tiled memory. However
> mem->mm_node is not a nouveau_mem for AGP-using pre-NV50 cards, but a
> drm_mm_node, as created by the ttm_bo_manager_func. As such, extend the
> untiled check to explicitly include all pre-nv50 cards.
>
> Reported-by: Ronald <ronald645@gmail.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74613
> Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
> ---
>
> Hmmm... this seems like a really fragile semantic, I wonder if more
> mem->mm_node usages have to be audited. But this one's quick and easy. I'd
> rather see something a little more solid around dealing with these
> differences, but not sure how without reading all the ttm gunk. Perhaps just
> make sure it's always a nouveau_mem by wrapping the ttm_bo_manager logic?
>
>   drivers/gpu/drm/nouveau/nouveau_bo.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index 488686d..4aed171 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1249,7 +1249,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
>   			mem->bus.is_iomem = !dev->agp->cant_use_aperture;
>   		}
>   #endif
> -		if (!node->memtype)
> +		if (nv_device(drm->device)->card_type < NV_50 || !node->memtype)
>   			/* untiled */
>   			break;
>   		/* fallthrough, tiled memory */
Acked-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>