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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 The Linux Foundation
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*/
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#include <linux/dma-map-ops.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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struct page **dma_common_find_pages(void *cpu_addr)
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{
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struct vm_struct *area = find_vm_area(cpu_addr);
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if (!area || !(area->flags & VM_DMA_COHERENT))
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return NULL;
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WARN(area->flags != VM_DMA_COHERENT,
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"unexpected flags in area: %p\n", cpu_addr);
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return area->pages;
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}
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/*
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* Remaps an array of PAGE_SIZE pages into another vm_area.
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* Cannot be used in non-sleeping contexts
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*/
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void *dma_common_pages_remap(struct page **pages, size_t size,
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pgprot_t prot, const void *caller)
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{
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void *vaddr;
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vaddr = vmap(pages, PAGE_ALIGN(size) >> PAGE_SHIFT,
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VM_DMA_COHERENT, prot);
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if (vaddr)
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find_vm_area(vaddr)->pages = pages;
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return vaddr;
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}
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/*
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* Remaps an allocated contiguous region into another vm_area.
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* Cannot be used in non-sleeping contexts
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*/
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void *dma_common_contiguous_remap(struct page *page, size_t size,
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pgprot_t prot, const void *caller)
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{
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int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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struct page **pages;
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void *vaddr;
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int i;
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pages = kvmalloc_objs(struct page *, count);
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if (!pages)
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return NULL;
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for (i = 0; i < count; i++)
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pages[i] = page++;
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vaddr = vmap(pages, count, VM_DMA_COHERENT, prot);
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kvfree(pages);
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return vaddr;
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}
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/*
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* Unmaps a range previously mapped by dma_common_*_remap
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*/
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void dma_common_free_remap(void *cpu_addr, size_t size)
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{
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struct vm_struct *area = find_vm_area(cpu_addr);
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if (!area || !(area->flags & VM_DMA_COHERENT)) {
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WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
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return;
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}
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vunmap(cpu_addr);
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}
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