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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>
135 lines
4.7 KiB
C
135 lines
4.7 KiB
C
/* exynos_drm_gem.h
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* Authoer: Inki Dae <inki.dae@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef _EXYNOS_DRM_GEM_H_
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#define _EXYNOS_DRM_GEM_H_
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#include <drm/drm_gem.h>
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#define to_exynos_gem(x) container_of(x, struct exynos_drm_gem, base)
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#define IS_NONCONTIG_BUFFER(f) (f & EXYNOS_BO_NONCONTIG)
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/*
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* exynos 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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* @buffer: a pointer to exynos_drm_gem_buffer object.
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* - contain the information to memory region allocated
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* by user request or at framebuffer creation.
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* continuous memory region allocated by user request
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* or at framebuffer creation.
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* @flags: indicate memory type to allocated buffer and cache attruibute.
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* @size: size requested from user, in bytes and this size is aligned
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* in page unit.
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* @cookie: cookie returned by dma_alloc_attrs
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* @kvaddr: kernel virtual address to allocated memory region.
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* @dma_addr: bus address(accessed by dma) to allocated memory region.
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* - this address could be physical address without IOMMU and
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* device address with IOMMU.
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* @pages: Array of backing pages.
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* @sgt: Imported sg_table.
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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 exynos_drm_gem {
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struct drm_gem_object base;
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unsigned int flags;
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unsigned long size;
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void *cookie;
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void __iomem *kvaddr;
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dma_addr_t dma_addr;
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unsigned long dma_attrs;
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struct page **pages;
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struct sg_table *sgt;
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};
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/* destroy a buffer with gem object */
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void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem);
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/* create a new buffer with gem object */
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struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
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unsigned int flags,
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unsigned long size);
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/*
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* request gem object creation and buffer allocation as the size
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* that it is calculated with framebuffer information such as width,
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* height and bpp.
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*/
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int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/* get fake-offset of gem object that can be used with mmap. */
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int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/*
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* get dma address from gem handle and this function could be used for
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* other drivers such as 2d/3d acceleration drivers.
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* with this function call, gem object reference count would be increased.
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*/
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dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *filp);
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/*
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* put dma address from gem handle and this function could be used for
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* other drivers such as 2d/3d acceleration drivers.
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* with this function call, gem object reference count would be decreased.
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*/
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void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *filp);
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/* get buffer information to memory region allocated by gem. */
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int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/* get buffer size to gem handle. */
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unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *file_priv);
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/* free gem object. */
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void exynos_drm_gem_free_object(struct drm_gem_object *obj);
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/* create memory region for drm framebuffer. */
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int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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/* map memory region for drm framebuffer to user space. */
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int exynos_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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/* page fault handler and mmap fault address(virtual) to physical memory. */
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int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
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/* set vm_flags and we can change the vm attribute to other one at here. */
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int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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/* low-level interface prime helpers */
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struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
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struct drm_gem_object *
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exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach,
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struct sg_table *sgt);
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void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj);
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void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
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int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
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struct vm_area_struct *vma);
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#endif
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