[PATCH] ttm: wait mem space if user allow while gpu busy

[Zhou, David(ChunMing)]

How about adding more condition ctx->resv inline to address your concern? As well as don't wait from same user, shouldn't lead to deadlock.

Otherwise, any other idea?

-------- Original Message --------
Subject: Re: [PATCH] ttm: wait mem space if user allow while gpu busy
From: Christian König
To: "Liang, Prike" ,"Zhou, David(ChunMing)" ,dri-devel at lists.freedesktop.org
CC:

Well that is certainly a NAK because it can lead to deadlock in the
memory management.

You can't just busy wait with all those locks held.

Regards,
Christian.

Am 23.04.19 um 03:45 schrieb Liang, Prike:
> Acked-by: Prike Liang <Prike.Liang at amd.com>
>
> Thanks,
> Prike
> -----Original Message-----
> From: Chunming Zhou <david1.zhou at amd.com>
> Sent: Monday, April 22, 2019 6:39 PM
> To: dri-devel at lists.freedesktop.org
> Cc: Liang, Prike <Prike.Liang at amd.com>; Zhou, David(ChunMing) <David1.Zhou at amd.com>
> Subject: [PATCH] ttm: wait mem space if user allow while gpu busy
>
> heavy gpu job could occupy memory long time, which could lead to other user fail to get memory.
>
> Change-Id: I0b322d98cd76e5ac32b00462bbae8008d76c5e11
> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
> ---
>   drivers/gpu/drm/ttm/ttm_bo.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 7c484729f9b2..6c596cc24bec 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -830,8 +830,10 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
>                if (mem->mm_node)
>                        break;
>                ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
> -             if (unlikely(ret != 0))
> -                     return ret;
> +             if (unlikely(ret != 0)) {
> +                     if (!ctx || ctx->no_wait_gpu || ret != -EBUSY)
> +                             return ret;
> +             }
>        } while (1);
>        mem->mem_type = mem_type;
>        return ttm_bo_add_move_fence(bo, man, mem);
> --
> 2.17.1
>
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