On 17/07/2019 19:33, Rob Herring wrote:
> In preparation to create partial GPU mappings of BOs on page faults,
> split out the SG list handling of panfrost_mmu_map().
>
> Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
> Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Steven Price <steven.price@xxxxxxx>
> Cc: Alyssa Rosenzweig <alyssa@xxxxxxxxxxxxx>
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Reviewed-by: Steven Price <steven.price@xxxxxxx>
> ---
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 52 +++++++++++++++----------
> 1 file changed, 31 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index f502e91be42a..5383b837f04b 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -167,27 +167,13 @@ static size_t get_pgsize(u64 addr, size_t size)
> return SZ_2M;
> }
>
> -int panfrost_mmu_map(struct panfrost_gem_object *bo)
> +static int mmu_map_sg(struct panfrost_device *pfdev, u64 iova,
> + int prot, struct sg_table *sgt)
> {
> - struct drm_gem_object *obj = &bo->base.base;
> - struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
> - struct io_pgtable_ops *ops = pfdev->mmu->pgtbl_ops;
> - u64 iova = bo->node.start << PAGE_SHIFT;
> unsigned int count;
> struct scatterlist *sgl;
> - struct sg_table *sgt;
> - int ret;
> -
> - if (WARN_ON(bo->is_mapped))
> - return 0;
> -
> - sgt = drm_gem_shmem_get_pages_sgt(obj);
> - if (WARN_ON(IS_ERR(sgt)))
> - return PTR_ERR(sgt);
> -
> - ret = pm_runtime_get_sync(pfdev->dev);
> - if (ret < 0)
> - return ret;
> + struct io_pgtable_ops *ops = pfdev->mmu->pgtbl_ops;
> + u64 start_iova = iova;
>
> mutex_lock(&pfdev->mmu->lock);
>
> @@ -200,18 +186,42 @@ int panfrost_mmu_map(struct panfrost_gem_object *bo)
> while (len) {
> size_t pgsize = get_pgsize(iova | paddr, len);
>
> - ops->map(ops, iova, paddr, pgsize, IOMMU_WRITE | IOMMU_READ);
> + ops->map(ops, iova, paddr, pgsize, prot);
> iova += pgsize;
> paddr += pgsize;
> len -= pgsize;
> }
> }
>
> - mmu_hw_do_operation(pfdev, 0, bo->node.start << PAGE_SHIFT,
> - bo->node.size << PAGE_SHIFT, AS_COMMAND_FLUSH_PT);
> + mmu_hw_do_operation(pfdev, 0, start_iova, iova - start_iova,
> + AS_COMMAND_FLUSH_PT);
>
> mutex_unlock(&pfdev->mmu->lock);
>
> + return 0;
> +}
> +
> +int panfrost_mmu_map(struct panfrost_gem_object *bo)
> +{
> + struct drm_gem_object *obj = &bo->base.base;
> + struct panfrost_device *pfdev = to_panfrost_device(obj->dev);
> + struct sg_table *sgt;
> + int ret;
> + int prot = IOMMU_READ | IOMMU_WRITE;
> +
> + if (WARN_ON(bo->is_mapped))
> + return 0;
> +
> + sgt = drm_gem_shmem_get_pages_sgt(obj);
> + if (WARN_ON(IS_ERR(sgt)))
> + return PTR_ERR(sgt);
> +
> + ret = pm_runtime_get_sync(pfdev->dev);
> + if (ret < 0)
> + return ret;
> +
> + mmu_map_sg(pfdev, bo->node.start << PAGE_SHIFT, prot, sgt);
> +
> pm_runtime_mark_last_busy(pfdev->dev);
> pm_runtime_put_autosuspend(pfdev->dev);
> bo->is_mapped = true;
>
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