Re: [PATCH RESEND 1/4] drm/prime: Limit scatter list size with dedicated DMA device

[Thomas Zimmermann <tzimmermann@suse.de>]

Am 10.03.26 um 04:25 schrieb Chen-Yu Tsai:
> If a dedicated DMA device is specified for the DRM device, then the
> scatter list size limit should pertain to the DMA device.
>
> Use the dedicated DMA device, if given, to limit the scatter list size.
> This only applies to drivers that have called drm_dev_set_dma_dev() and
> are using drm_prime_pages_to_sg() either directly or through the SHMEM
> helpers. At the time of this writing, the former case only includes the
> Rockchip DRM driver, while the latter case includes the gud, udl, and
> the tiny appletbdrm and gm12u320 drivers.
>
> Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/gpu/drm/drm_prime.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 51fdb06d3e9f..9b44c78cd77f 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -859,7 +859,7 @@ struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
>   		return ERR_PTR(-ENOMEM);
>   
>   	if (dev)
> -		max_segment = dma_max_mapping_size(dev->dev);
> +		max_segment = dma_max_mapping_size(drm_dev_dma_dev(dev));
>   	if (max_segment == 0)
>   		max_segment = UINT_MAX;
>   	err = sg_alloc_table_from_pages_segment(sg, pages, nr_pages, 0,

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)