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00085f1efa
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 <k.kozlowski@samsung.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Acked-by: Mark Salter <msalter@redhat.com> [c6x]
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris]
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm]
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp]
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core]
Acked-by: David Vrabel <david.vrabel@citrix.com> [xen]
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb]
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390]
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32]
Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc]
Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
59 lines
2 KiB
C
59 lines
2 KiB
C
/*
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* Copyright (c) 2015 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _MTK_DRM_GEM_H_
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#define _MTK_DRM_GEM_H_
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#include <drm/drm_gem.h>
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/*
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* mtk drm buffer structure.
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*
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* @base: a gem object.
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* - a new handle to this gem object would be created
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* by drm_gem_handle_create().
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* @cookie: the return value of dma_alloc_attrs(), keep it for dma_free_attrs()
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* @kvaddr: kernel virtual address of gem buffer.
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* @dma_addr: dma address of gem buffer.
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* @dma_attrs: dma attributes of gem buffer.
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*
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* P.S. this object would be transferred to user as kms_bo.handle so
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* user can access the buffer through kms_bo.handle.
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*/
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struct mtk_drm_gem_obj {
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struct drm_gem_object base;
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void *cookie;
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void *kvaddr;
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dma_addr_t dma_addr;
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unsigned long dma_attrs;
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struct sg_table *sg;
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};
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#define to_mtk_gem_obj(x) container_of(x, struct mtk_drm_gem_obj, base)
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void mtk_drm_gem_free_object(struct drm_gem_object *gem);
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struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size,
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bool alloc_kmap);
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int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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int mtk_drm_gem_dumb_map_offset(struct drm_file *file_priv,
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struct drm_device *dev, uint32_t handle,
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uint64_t *offset);
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int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
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struct vm_area_struct *vma);
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struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
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struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach, struct sg_table *sg);
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#endif
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