From 00085f1efa387a8ce100e3734920f7639c80caa3 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Wed, 3 Aug 2016 13:46:00 -0700 Subject: dma-mapping: use unsigned long for dma_attrs The dma-mapping core and the implementations do not change the DMA attributes passed by pointer. Thus the pointer can point to const data. However the attributes do not have to be a bitfield. Instead unsigned long will do fine: 1. This is just simpler. Both in terms of reading the code and setting attributes. Instead of initializing local attributes on the stack and passing pointer to it to dma_set_attr(), just set the bits. 2. It brings safeness and checking for const correctness because the attributes are passed by value. Semantic patches for this change (at least most of them): virtual patch virtual context @r@ identifier f, attrs; @@ f(..., - struct dma_attrs *attrs + unsigned long attrs , ...) { ... } @@ identifier r.f; @@ f(..., - NULL + 0 ) and // Options: --all-includes virtual patch virtual context @r@ identifier f, attrs; type t; @@ t f(..., struct dma_attrs *attrs); @@ identifier r.f; @@ f(..., - NULL + 0 ) Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com Signed-off-by: Krzysztof Kozlowski Acked-by: Vineet Gupta Acked-by: Robin Murphy Acked-by: Hans-Christian Noren Egtvedt Acked-by: Mark Salter [c6x] Acked-by: Jesper Nilsson [cris] Acked-by: Daniel Vetter [drm] Reviewed-by: Bart Van Assche Acked-by: Joerg Roedel [iommu] Acked-by: Fabien Dessenne [bdisp] Reviewed-by: Marek Szyprowski [vb2-core] Acked-by: David Vrabel [xen] Acked-by: Konrad Rzeszutek Wilk [xen swiotlb] Acked-by: Joerg Roedel [iommu] Acked-by: Richard Kuo [hexagon] Acked-by: Geert Uytterhoeven [m68k] Acked-by: Gerald Schaefer [s390] Acked-by: Bjorn Andersson Acked-by: Hans-Christian Noren Egtvedt [avr32] Acked-by: Vineet Gupta [arc] Acked-by: Robin Murphy [arm64 and dma-iommu] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 17 +++++++---------- drivers/gpu/drm/rockchip/rockchip_drm_gem.h | 2 +- 2 files changed, 8 insertions(+), 11 deletions(-) (limited to 'drivers/gpu/drm/rockchip') diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index 059e902f872d..b70f9423379c 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c @@ -17,8 +17,6 @@ #include #include -#include - #include "rockchip_drm_drv.h" #include "rockchip_drm_gem.h" @@ -28,15 +26,14 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj, struct drm_gem_object *obj = &rk_obj->base; struct drm_device *drm = obj->dev; - init_dma_attrs(&rk_obj->dma_attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs); + rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE; if (!alloc_kmap) - dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs); + rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING; rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size, &rk_obj->dma_addr, GFP_KERNEL, - &rk_obj->dma_attrs); + rk_obj->dma_attrs); if (!rk_obj->kvaddr) { DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size); return -ENOMEM; @@ -51,7 +48,7 @@ static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj) struct drm_device *drm = obj->dev; dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr, - &rk_obj->dma_attrs); + rk_obj->dma_attrs); } static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj, @@ -70,7 +67,7 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj, vma->vm_pgoff = 0; ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr, - obj->size, &rk_obj->dma_attrs); + obj->size, rk_obj->dma_attrs); if (ret) drm_gem_vm_close(vma); @@ -262,7 +259,7 @@ struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj) ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr, rk_obj->dma_addr, obj->size, - &rk_obj->dma_attrs); + rk_obj->dma_attrs); if (ret) { DRM_ERROR("failed to allocate sgt, %d\n", ret); kfree(sgt); @@ -276,7 +273,7 @@ void *rockchip_gem_prime_vmap(struct drm_gem_object *obj) { struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); - if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs)) + if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING) return NULL; return rk_obj->kvaddr; diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h index ad22618473a4..18b3488db4ec 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.h +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.h @@ -23,7 +23,7 @@ struct rockchip_gem_object { void *kvaddr; dma_addr_t dma_addr; - struct dma_attrs dma_attrs; + unsigned long dma_attrs; }; struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj); -- cgit