Re: [PATCH] drm/msm: stop abusing dma_map/unmap for cache

[Sean Paul <sean@poorly.run>]

On Sun, Jun 30, 2019 at 05:47:22AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@chromium.org>
> 
> Recently splats like this started showing up:
> 
>    WARNING: CPU: 4 PID: 251 at drivers/iommu/dma-iommu.c:451 __iommu_dma_unmap+0xb8/0xc0
>    Modules linked in: ath10k_snoc ath10k_core fuse msm ath mac80211 uvcvideo cfg80211 videobuf2_vmalloc videobuf2_memops vide
>    CPU: 4 PID: 251 Comm: kworker/u16:4 Tainted: G        W         5.2.0-rc5-next-20190619+ #2317
>    Hardware name: LENOVO 81JL/LNVNB161216, BIOS 9UCN23WW(V1.06) 10/25/2018
>    Workqueue: msm msm_gem_free_work [msm]
>    pstate: 80c00005 (Nzcv daif +PAN +UAO)
>    pc : __iommu_dma_unmap+0xb8/0xc0
>    lr : __iommu_dma_unmap+0x54/0xc0
>    sp : ffff0000119abce0
>    x29: ffff0000119abce0 x28: 0000000000000000
>    x27: ffff8001f9946648 x26: ffff8001ec271068
>    x25: 0000000000000000 x24: ffff8001ea3580a8
>    x23: ffff8001f95ba010 x22: ffff80018e83ba88
>    x21: ffff8001e548f000 x20: fffffffffffff000
>    x19: 0000000000001000 x18: 00000000c00001fe
>    x17: 0000000000000000 x16: 0000000000000000
>    x15: ffff000015b70068 x14: 0000000000000005
>    x13: 0003142cc1be1768 x12: 0000000000000001
>    x11: ffff8001f6de9100 x10: 0000000000000009
>    x9 : ffff000015b78000 x8 : 0000000000000000
>    x7 : 0000000000000001 x6 : fffffffffffff000
>    x5 : 0000000000000fff x4 : ffff00001065dbc8
>    x3 : 000000000000000d x2 : 0000000000001000
>    x1 : fffffffffffff000 x0 : 0000000000000000
>    Call trace:
>     __iommu_dma_unmap+0xb8/0xc0
>     iommu_dma_unmap_sg+0x98/0xb8
>     put_pages+0x5c/0xf0 [msm]
>     msm_gem_free_work+0x10c/0x150 [msm]
>     process_one_work+0x1e0/0x330
>     worker_thread+0x40/0x438
>     kthread+0x12c/0x130
>     ret_from_fork+0x10/0x18
>    ---[ end trace afc0dc5ab81a06bf ]---
> 
> Not quite sure what triggered that, but we really shouldn't be abusing
> dma_{map,unmap}_sg() for cache maint.
> 
> Signed-off-by: Rob Clark <robdclark@chromium.org>
> Cc: Stephen Boyd <sboyd@kernel.org>

Applied to -misc-fixes

Thanks,

Sean

> ---
>  drivers/gpu/drm/msm/msm_gem.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index d31d9f927887..3b84cbdcafa3 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -108,7 +108,7 @@ static struct page **get_pages(struct drm_gem_object *obj)
>  		 * because display controller, GPU, etc. are not coherent:
>  		 */
>  		if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
> -			dma_map_sg(dev->dev, msm_obj->sgt->sgl,
> +			dma_sync_sg_for_device(dev->dev, msm_obj->sgt->sgl,
>  					msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
>  	}
>  
> @@ -138,7 +138,7 @@ static void put_pages(struct drm_gem_object *obj)
>  			 * GPU, etc. are not coherent:
>  			 */
>  			if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
> -				dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
> +				dma_sync_sg_for_cpu(obj->dev->dev, msm_obj->sgt->sgl,
>  					     msm_obj->sgt->nents,
>  					     DMA_BIDIRECTIONAL);
>  
> -- 
> 2.20.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS