From a8bc8c6510d64b759644647a03f8aec55056bded Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Tue, 15 Aug 2017 15:42:40 +0200 Subject: [PATCH] drm/tegra: gem: Implement mmap() for PRIME buffers The mapping of PRIME buffers can reuse much of the GEM mapping code, so extract the common bits into a new tegra_gem_mmap() helper. Reviewed-by: Chris Wilson Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/gem.c | 49 +++++++++++++++++++++++++------------ 1 file changed, 34 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index fe77bcd23800..ef068556a9d7 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -481,30 +481,28 @@ const struct vm_operations_struct tegra_bo_vm_ops = { .close = drm_gem_vm_close, }; -int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) +static int tegra_gem_mmap(struct drm_gem_object *gem, + struct vm_area_struct *vma) { - struct drm_gem_object *gem; - struct tegra_bo *bo; - int ret; - - ret = drm_gem_mmap(file, vma); - if (ret) - return ret; - - gem = vma->vm_private_data; - bo = to_tegra_bo(gem); + struct tegra_bo *bo = to_tegra_bo(gem); if (!bo->pages) { unsigned long vm_pgoff = vma->vm_pgoff; + int err; + /* + * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), + * and set the vm_pgoff (used as a fake buffer offset by DRM) + * to 0 as we want to map the whole buffer. + */ vma->vm_flags &= ~VM_PFNMAP; vma->vm_pgoff = 0; - ret = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr, + err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->paddr, gem->size); - if (ret) { + if (err < 0) { drm_gem_vm_close(vma); - return ret; + return err; } vma->vm_pgoff = vm_pgoff; @@ -520,6 +518,20 @@ int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) return 0; } +int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct drm_gem_object *gem; + int err; + + err = drm_gem_mmap(file, vma); + if (err < 0) + return err; + + gem = vma->vm_private_data; + + return tegra_gem_mmap(gem, vma); +} + static struct sg_table * tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, enum dma_data_direction dir) @@ -603,7 +615,14 @@ static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page, static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) { - return -EINVAL; + struct drm_gem_object *gem = buf->priv; + int err; + + err = drm_gem_mmap_obj(gem, gem->size, vma); + if (err < 0) + return err; + + return tegra_gem_mmap(gem, vma); } static void *tegra_gem_prime_vmap(struct dma_buf *buf) -- 2.20.1