From eecbb3cdcccac24e1e67e92fec24f9035fe19784 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Mon, 1 Jul 2019 17:05:43 -0600 Subject: drm/panfrost: Split panfrost_mmu_map SG list mapping to its own function 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 Cc: Boris Brezillon Cc: Robin Murphy Reviewed: Steven Price Acked-by: Alyssa Rosenzweig Signed-off-by: Rob Herring Link: https://patchwork.freedesktop.org/patch/msgid/20190808222200.13176-5-robh@kernel.org --- drivers/gpu/drm/panfrost/panfrost_mmu.c | 52 ++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 21 deletions(-) (limited to 'drivers/gpu/drm/panfrost/panfrost_mmu.c') diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index 92ac995dd9c6..b4ac149b2399 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -145,27 +145,13 @@ 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); @@ -178,18 +164,42 @@ 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; -- cgit v1.2.3