linux-kernel - Re: [PATCH 1/1] drm/nouveau/device: Get right pgsize_bitmap of iommu

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Date:   Mon, 20 Dec 2021 11:22:51 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     Joerg Roedel <joro@...tes.org>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] drm/nouveau/device: Get right pgsize_bitmap of
 iommu_domain

On 2021-12-18 07:45, Lu Baolu wrote:
> The suported page sizes of an iommu_domain are saved in the pgsize_bitmap
> field. Retrieve the value from the right place.
> 
> Fixes: 58fd9375c2c534 ("drm/nouveau/platform: probe IOMMU if present")

...except domain->pgsize_bitmap was introduced more than a year after 
that commit ;)

As an improvement rather than a fix, though,

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>   drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> index d0d52c1d4aee..992cc285f2fe 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> @@ -133,7 +133,7 @@ nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
>   		 * or equal to the system's PAGE_SIZE, with a preference if
>   		 * both are equal.
>   		 */
> -		pgsize_bitmap = tdev->iommu.domain->ops->pgsize_bitmap;
> +		pgsize_bitmap = tdev->iommu.domain->pgsize_bitmap;
>   		if (pgsize_bitmap & PAGE_SIZE) {
>   			tdev->iommu.pgshift = PAGE_SHIFT;
>   		} else {