828 lines
24 KiB
C
828 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch-independent dma-mapping routines
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*
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* Copyright (c) 2006 SUSE Linux Products GmbH
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* Copyright (c) 2006 Tejun Heo <teheo@suse.de>
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*/
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#include <linux/memblock.h> /* for max_pfn */
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#include <linux/acpi.h>
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#include <linux/dma-map-ops.h>
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <linux/of_device.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "debug.h"
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#include "direct.h"
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bool dma_default_coherent;
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/*
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* Managed DMA API
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*/
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struct dma_devres {
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size_t size;
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void *vaddr;
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dma_addr_t dma_handle;
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unsigned long attrs;
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};
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static void dmam_release(struct device *dev, void *res)
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{
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struct dma_devres *this = res;
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dma_free_attrs(dev, this->size, this->vaddr, this->dma_handle,
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this->attrs);
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}
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static int dmam_match(struct device *dev, void *res, void *match_data)
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{
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struct dma_devres *this = res, *match = match_data;
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if (this->vaddr == match->vaddr) {
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WARN_ON(this->size != match->size ||
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this->dma_handle != match->dma_handle);
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return 1;
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}
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return 0;
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}
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/**
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* dmam_free_coherent - Managed dma_free_coherent()
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* @dev: Device to free coherent memory for
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* @size: Size of allocation
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* @vaddr: Virtual address of the memory to free
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* @dma_handle: DMA handle of the memory to free
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*
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* Managed dma_free_coherent().
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*/
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void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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struct dma_devres match_data = { size, vaddr, dma_handle };
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dma_free_coherent(dev, size, vaddr, dma_handle);
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WARN_ON(devres_destroy(dev, dmam_release, dmam_match, &match_data));
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}
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EXPORT_SYMBOL(dmam_free_coherent);
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/**
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* dmam_alloc_attrs - Managed dma_alloc_attrs()
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* @dev: Device to allocate non_coherent memory for
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* @size: Size of allocation
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* @dma_handle: Out argument for allocated DMA handle
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* @gfp: Allocation flags
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* @attrs: Flags in the DMA_ATTR_* namespace.
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*
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* Managed dma_alloc_attrs(). Memory allocated using this function will be
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* automatically released on driver detach.
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*
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* RETURNS:
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* Pointer to allocated memory on success, NULL on failure.
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*/
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void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs)
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{
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struct dma_devres *dr;
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void *vaddr;
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dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
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if (!dr)
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return NULL;
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vaddr = dma_alloc_attrs(dev, size, dma_handle, gfp, attrs);
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if (!vaddr) {
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devres_free(dr);
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return NULL;
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}
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dr->vaddr = vaddr;
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dr->dma_handle = *dma_handle;
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dr->size = size;
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dr->attrs = attrs;
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devres_add(dev, dr);
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return vaddr;
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}
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EXPORT_SYMBOL(dmam_alloc_attrs);
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static bool dma_go_direct(struct device *dev, dma_addr_t mask,
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const struct dma_map_ops *ops)
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{
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if (likely(!ops))
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return true;
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#ifdef CONFIG_DMA_OPS_BYPASS
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if (dev->dma_ops_bypass)
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return min_not_zero(mask, dev->bus_dma_limit) >=
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dma_direct_get_required_mask(dev);
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#endif
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return false;
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}
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/*
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* Check if the devices uses a direct mapping for streaming DMA operations.
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* This allows IOMMU drivers to set a bypass mode if the DMA mask is large
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* enough.
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*/
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static inline bool dma_alloc_direct(struct device *dev,
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const struct dma_map_ops *ops)
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{
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return dma_go_direct(dev, dev->coherent_dma_mask, ops);
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}
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static inline bool dma_map_direct(struct device *dev,
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const struct dma_map_ops *ops)
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{
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return dma_go_direct(dev, *dev->dma_mask, ops);
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}
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dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page,
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size_t offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr;
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BUG_ON(!valid_dma_direction(dir));
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if (WARN_ON_ONCE(!dev->dma_mask))
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return DMA_MAPPING_ERROR;
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if (dma_map_direct(dev, ops) ||
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arch_dma_map_page_direct(dev, page_to_phys(page) + offset + size))
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addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
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else
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addr = ops->map_page(dev, page, offset, size, dir, attrs);
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debug_dma_map_page(dev, page, offset, size, dir, addr, attrs);
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return addr;
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}
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EXPORT_SYMBOL(dma_map_page_attrs);
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void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (dma_map_direct(dev, ops) ||
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arch_dma_unmap_page_direct(dev, addr + size))
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dma_direct_unmap_page(dev, addr, size, dir, attrs);
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else if (ops->unmap_page)
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ops->unmap_page(dev, addr, size, dir, attrs);
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debug_dma_unmap_page(dev, addr, size, dir);
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}
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EXPORT_SYMBOL(dma_unmap_page_attrs);
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static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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int ents;
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BUG_ON(!valid_dma_direction(dir));
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if (WARN_ON_ONCE(!dev->dma_mask))
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return 0;
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if (dma_map_direct(dev, ops) ||
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arch_dma_map_sg_direct(dev, sg, nents))
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ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
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else
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ents = ops->map_sg(dev, sg, nents, dir, attrs);
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if (ents > 0)
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debug_dma_map_sg(dev, sg, nents, ents, dir, attrs);
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else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
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ents != -EIO && ents != -EREMOTEIO))
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return -EIO;
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return ents;
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}
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/**
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* dma_map_sg_attrs - Map the given buffer for DMA
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* @dev: The device for which to perform the DMA operation
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* @sg: The sg_table object describing the buffer
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* @nents: Number of entries to map
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* @dir: DMA direction
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* @attrs: Optional DMA attributes for the map operation
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*
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* Maps a buffer described by a scatterlist passed in the sg argument with
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* nents segments for the @dir DMA operation by the @dev device.
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*
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* Returns the number of mapped entries (which can be less than nents)
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* on success. Zero is returned for any error.
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*
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* dma_unmap_sg_attrs() should be used to unmap the buffer with the
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* original sg and original nents (not the value returned by this funciton).
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*/
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unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir, unsigned long attrs)
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{
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int ret;
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ret = __dma_map_sg_attrs(dev, sg, nents, dir, attrs);
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if (ret < 0)
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return 0;
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return ret;
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}
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EXPORT_SYMBOL(dma_map_sg_attrs);
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/**
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* dma_map_sgtable - Map the given buffer for DMA
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* @dev: The device for which to perform the DMA operation
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* @sgt: The sg_table object describing the buffer
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* @dir: DMA direction
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* @attrs: Optional DMA attributes for the map operation
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*
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* Maps a buffer described by a scatterlist stored in the given sg_table
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* object for the @dir DMA operation by the @dev device. After success, the
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* ownership for the buffer is transferred to the DMA domain. One has to
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* call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the
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* ownership of the buffer back to the CPU domain before touching the
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* buffer by the CPU.
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*
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* Returns 0 on success or a negative error code on error. The following
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* error codes are supported with the given meaning:
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*
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* -EINVAL An invalid argument, unaligned access or other error
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* in usage. Will not succeed if retried.
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* -ENOMEM Insufficient resources (like memory or IOVA space) to
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* complete the mapping. Should succeed if retried later.
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* -EIO Legacy error code with an unknown meaning. eg. this is
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* returned if a lower level call returned
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* DMA_MAPPING_ERROR.
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* -EREMOTEIO The DMA device cannot access P2PDMA memory specified
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* in the sg_table. This will not succeed if retried.
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*/
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int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
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enum dma_data_direction dir, unsigned long attrs)
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{
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int nents;
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nents = __dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
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if (nents < 0)
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return nents;
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sgt->nents = nents;
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return 0;
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}
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EXPORT_SYMBOL_GPL(dma_map_sgtable);
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void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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debug_dma_unmap_sg(dev, sg, nents, dir);
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if (dma_map_direct(dev, ops) ||
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arch_dma_unmap_sg_direct(dev, sg, nents))
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dma_direct_unmap_sg(dev, sg, nents, dir, attrs);
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else if (ops->unmap_sg)
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ops->unmap_sg(dev, sg, nents, dir, attrs);
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}
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EXPORT_SYMBOL(dma_unmap_sg_attrs);
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dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr,
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size_t size, enum dma_data_direction dir, unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr = DMA_MAPPING_ERROR;
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BUG_ON(!valid_dma_direction(dir));
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if (WARN_ON_ONCE(!dev->dma_mask))
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return DMA_MAPPING_ERROR;
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if (dma_map_direct(dev, ops))
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addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
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else if (ops->map_resource)
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addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
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debug_dma_map_resource(dev, phys_addr, size, dir, addr, attrs);
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return addr;
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}
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EXPORT_SYMBOL(dma_map_resource);
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void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (!dma_map_direct(dev, ops) && ops->unmap_resource)
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ops->unmap_resource(dev, addr, size, dir, attrs);
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debug_dma_unmap_resource(dev, addr, size, dir);
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}
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EXPORT_SYMBOL(dma_unmap_resource);
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
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enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (dma_map_direct(dev, ops))
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dma_direct_sync_single_for_cpu(dev, addr, size, dir);
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else if (ops->sync_single_for_cpu)
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ops->sync_single_for_cpu(dev, addr, size, dir);
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debug_dma_sync_single_for_cpu(dev, addr, size, dir);
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}
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EXPORT_SYMBOL(dma_sync_single_for_cpu);
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void dma_sync_single_for_device(struct device *dev, dma_addr_t addr,
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size_t size, enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (dma_map_direct(dev, ops))
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dma_direct_sync_single_for_device(dev, addr, size, dir);
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else if (ops->sync_single_for_device)
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ops->sync_single_for_device(dev, addr, size, dir);
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debug_dma_sync_single_for_device(dev, addr, size, dir);
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}
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EXPORT_SYMBOL(dma_sync_single_for_device);
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void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (dma_map_direct(dev, ops))
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dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir);
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else if (ops->sync_sg_for_cpu)
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ops->sync_sg_for_cpu(dev, sg, nelems, dir);
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debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
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}
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EXPORT_SYMBOL(dma_sync_sg_for_cpu);
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void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (dma_map_direct(dev, ops))
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dma_direct_sync_sg_for_device(dev, sg, nelems, dir);
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else if (ops->sync_sg_for_device)
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ops->sync_sg_for_device(dev, sg, nelems, dir);
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debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
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}
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EXPORT_SYMBOL(dma_sync_sg_for_device);
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/*
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* The whole dma_get_sgtable() idea is fundamentally unsafe - it seems
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* that the intention is to allow exporting memory allocated via the
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* coherent DMA APIs through the dma_buf API, which only accepts a
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* scattertable. This presents a couple of problems:
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* 1. Not all memory allocated via the coherent DMA APIs is backed by
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* a struct page
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* 2. Passing coherent DMA memory into the streaming APIs is not allowed
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* as we will try to flush the memory through a different alias to that
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* actually being used (and the flushes are redundant.)
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*/
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int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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if (dma_alloc_direct(dev, ops))
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return dma_direct_get_sgtable(dev, sgt, cpu_addr, dma_addr,
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size, attrs);
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if (!ops->get_sgtable)
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return -ENXIO;
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return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, attrs);
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}
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EXPORT_SYMBOL(dma_get_sgtable_attrs);
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#ifdef CONFIG_MMU
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/*
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* Return the page attributes used for mapping dma_alloc_* memory, either in
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* kernel space if remapping is needed, or to userspace through dma_mmap_*.
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*/
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pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs)
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{
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if (dev_is_dma_coherent(dev))
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return prot;
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#ifdef CONFIG_ARCH_HAS_DMA_WRITE_COMBINE
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if (attrs & DMA_ATTR_WRITE_COMBINE)
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return pgprot_writecombine(prot);
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#endif
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return pgprot_dmacoherent(prot);
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}
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#endif /* CONFIG_MMU */
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/**
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* dma_can_mmap - check if a given device supports dma_mmap_*
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* @dev: device to check
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*
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* Returns %true if @dev supports dma_mmap_coherent() and dma_mmap_attrs() to
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* map DMA allocations to userspace.
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*/
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bool dma_can_mmap(struct device *dev)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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if (dma_alloc_direct(dev, ops))
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return dma_direct_can_mmap(dev);
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return ops->mmap != NULL;
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}
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EXPORT_SYMBOL_GPL(dma_can_mmap);
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/**
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* dma_mmap_attrs - map a coherent DMA allocation into user space
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @vma: vm_area_struct describing requested user mapping
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* @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
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* @dma_addr: device-view address returned from dma_alloc_attrs
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* @size: size of memory originally requested in dma_alloc_attrs
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* @attrs: attributes of mapping properties requested in dma_alloc_attrs
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*
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* Map a coherent DMA buffer previously allocated by dma_alloc_attrs into user
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* space. The coherent DMA buffer must not be freed by the driver until the
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* user space mapping has been released.
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*/
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int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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if (dma_alloc_direct(dev, ops))
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return dma_direct_mmap(dev, vma, cpu_addr, dma_addr, size,
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attrs);
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if (!ops->mmap)
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return -ENXIO;
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return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
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}
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EXPORT_SYMBOL(dma_mmap_attrs);
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|
|
u64 dma_get_required_mask(struct device *dev)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (dma_alloc_direct(dev, ops))
|
|
return dma_direct_get_required_mask(dev);
|
|
if (ops->get_required_mask)
|
|
return ops->get_required_mask(dev);
|
|
|
|
/*
|
|
* We require every DMA ops implementation to at least support a 32-bit
|
|
* DMA mask (and use bounce buffering if that isn't supported in
|
|
* hardware). As the direct mapping code has its own routine to
|
|
* actually report an optimal mask we default to 32-bit here as that
|
|
* is the right thing for most IOMMUs, and at least not actively
|
|
* harmful in general.
|
|
*/
|
|
return DMA_BIT_MASK(32);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_get_required_mask);
|
|
|
|
void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
|
|
gfp_t flag, unsigned long attrs)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
void *cpu_addr;
|
|
|
|
WARN_ON_ONCE(!dev->coherent_dma_mask);
|
|
|
|
if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
|
|
return cpu_addr;
|
|
|
|
/* let the implementation decide on the zone to allocate from: */
|
|
flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
|
|
|
|
if (dma_alloc_direct(dev, ops))
|
|
cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs);
|
|
else if (ops->alloc)
|
|
cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
|
|
else
|
|
return NULL;
|
|
|
|
debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr, attrs);
|
|
return cpu_addr;
|
|
}
|
|
EXPORT_SYMBOL(dma_alloc_attrs);
|
|
|
|
void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
|
|
return;
|
|
/*
|
|
* On non-coherent platforms which implement DMA-coherent buffers via
|
|
* non-cacheable remaps, ops->free() may call vunmap(). Thus getting
|
|
* this far in IRQ context is a) at risk of a BUG_ON() or trying to
|
|
* sleep on some machines, and b) an indication that the driver is
|
|
* probably misusing the coherent API anyway.
|
|
*/
|
|
WARN_ON(irqs_disabled());
|
|
|
|
if (!cpu_addr)
|
|
return;
|
|
|
|
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
|
|
if (dma_alloc_direct(dev, ops))
|
|
dma_direct_free(dev, size, cpu_addr, dma_handle, attrs);
|
|
else if (ops->free)
|
|
ops->free(dev, size, cpu_addr, dma_handle, attrs);
|
|
}
|
|
EXPORT_SYMBOL(dma_free_attrs);
|
|
|
|
static struct page *__dma_alloc_pages(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (WARN_ON_ONCE(!dev->coherent_dma_mask))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM)))
|
|
return NULL;
|
|
|
|
size = PAGE_ALIGN(size);
|
|
if (dma_alloc_direct(dev, ops))
|
|
return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
|
|
if (!ops->alloc_pages)
|
|
return NULL;
|
|
return ops->alloc_pages(dev, size, dma_handle, dir, gfp);
|
|
}
|
|
|
|
struct page *dma_alloc_pages(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
|
|
{
|
|
struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp);
|
|
|
|
if (page)
|
|
debug_dma_map_page(dev, page, 0, size, dir, *dma_handle, 0);
|
|
return page;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_alloc_pages);
|
|
|
|
static void __dma_free_pages(struct device *dev, size_t size, struct page *page,
|
|
dma_addr_t dma_handle, enum dma_data_direction dir)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
size = PAGE_ALIGN(size);
|
|
if (dma_alloc_direct(dev, ops))
|
|
dma_direct_free_pages(dev, size, page, dma_handle, dir);
|
|
else if (ops->free_pages)
|
|
ops->free_pages(dev, size, page, dma_handle, dir);
|
|
}
|
|
|
|
void dma_free_pages(struct device *dev, size_t size, struct page *page,
|
|
dma_addr_t dma_handle, enum dma_data_direction dir)
|
|
{
|
|
debug_dma_unmap_page(dev, dma_handle, size, dir);
|
|
__dma_free_pages(dev, size, page, dma_handle, dir);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_free_pages);
|
|
|
|
int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
|
|
size_t size, struct page *page)
|
|
{
|
|
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
|
|
if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff)
|
|
return -ENXIO;
|
|
return remap_pfn_range(vma, vma->vm_start,
|
|
page_to_pfn(page) + vma->vm_pgoff,
|
|
vma_pages(vma) << PAGE_SHIFT, vma->vm_page_prot);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_mmap_pages);
|
|
|
|
static struct sg_table *alloc_single_sgt(struct device *dev, size_t size,
|
|
enum dma_data_direction dir, gfp_t gfp)
|
|
{
|
|
struct sg_table *sgt;
|
|
struct page *page;
|
|
|
|
sgt = kmalloc(sizeof(*sgt), gfp);
|
|
if (!sgt)
|
|
return NULL;
|
|
if (sg_alloc_table(sgt, 1, gfp))
|
|
goto out_free_sgt;
|
|
page = __dma_alloc_pages(dev, size, &sgt->sgl->dma_address, dir, gfp);
|
|
if (!page)
|
|
goto out_free_table;
|
|
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
|
|
sg_dma_len(sgt->sgl) = sgt->sgl->length;
|
|
return sgt;
|
|
out_free_table:
|
|
sg_free_table(sgt);
|
|
out_free_sgt:
|
|
kfree(sgt);
|
|
return NULL;
|
|
}
|
|
|
|
struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
|
|
enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
struct sg_table *sgt;
|
|
|
|
if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES))
|
|
return NULL;
|
|
|
|
if (ops && ops->alloc_noncontiguous)
|
|
sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs);
|
|
else
|
|
sgt = alloc_single_sgt(dev, size, dir, gfp);
|
|
|
|
if (sgt) {
|
|
sgt->nents = 1;
|
|
debug_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir, attrs);
|
|
}
|
|
return sgt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_alloc_noncontiguous);
|
|
|
|
static void free_single_sgt(struct device *dev, size_t size,
|
|
struct sg_table *sgt, enum dma_data_direction dir)
|
|
{
|
|
__dma_free_pages(dev, size, sg_page(sgt->sgl), sgt->sgl->dma_address,
|
|
dir);
|
|
sg_free_table(sgt);
|
|
kfree(sgt);
|
|
}
|
|
|
|
void dma_free_noncontiguous(struct device *dev, size_t size,
|
|
struct sg_table *sgt, enum dma_data_direction dir)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
debug_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
|
|
if (ops && ops->free_noncontiguous)
|
|
ops->free_noncontiguous(dev, size, sgt, dir);
|
|
else
|
|
free_single_sgt(dev, size, sgt, dir);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_free_noncontiguous);
|
|
|
|
void *dma_vmap_noncontiguous(struct device *dev, size_t size,
|
|
struct sg_table *sgt)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
|
|
if (ops && ops->alloc_noncontiguous)
|
|
return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL);
|
|
return page_address(sg_page(sgt->sgl));
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_vmap_noncontiguous);
|
|
|
|
void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (ops && ops->alloc_noncontiguous)
|
|
vunmap(vaddr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_vunmap_noncontiguous);
|
|
|
|
int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
|
|
size_t size, struct sg_table *sgt)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (ops && ops->alloc_noncontiguous) {
|
|
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
|
|
if (vma->vm_pgoff >= count ||
|
|
vma_pages(vma) > count - vma->vm_pgoff)
|
|
return -ENXIO;
|
|
return vm_map_pages(vma, sgt_handle(sgt)->pages, count);
|
|
}
|
|
return dma_mmap_pages(dev, vma, size, sg_page(sgt->sgl));
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous);
|
|
|
|
static int dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
/*
|
|
* ->dma_supported sets the bypass flag, so we must always call
|
|
* into the method here unless the device is truly direct mapped.
|
|
*/
|
|
if (!ops)
|
|
return dma_direct_supported(dev, mask);
|
|
if (!ops->dma_supported)
|
|
return 1;
|
|
return ops->dma_supported(dev, mask);
|
|
}
|
|
|
|
bool dma_pci_p2pdma_supported(struct device *dev)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
/* if ops is not set, dma direct will be used which supports P2PDMA */
|
|
if (!ops)
|
|
return true;
|
|
|
|
/*
|
|
* Note: dma_ops_bypass is not checked here because P2PDMA should
|
|
* not be used with dma mapping ops that do not have support even
|
|
* if the specific device is bypassing them.
|
|
*/
|
|
|
|
return ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_pci_p2pdma_supported);
|
|
|
|
#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
|
|
void arch_dma_set_mask(struct device *dev, u64 mask);
|
|
#else
|
|
#define arch_dma_set_mask(dev, mask) do { } while (0)
|
|
#endif
|
|
|
|
int dma_set_mask(struct device *dev, u64 mask)
|
|
{
|
|
/*
|
|
* Truncate the mask to the actually supported dma_addr_t width to
|
|
* avoid generating unsupportable addresses.
|
|
*/
|
|
mask = (dma_addr_t)mask;
|
|
|
|
if (!dev->dma_mask || !dma_supported(dev, mask))
|
|
return -EIO;
|
|
|
|
arch_dma_set_mask(dev, mask);
|
|
*dev->dma_mask = mask;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dma_set_mask);
|
|
|
|
int dma_set_coherent_mask(struct device *dev, u64 mask)
|
|
{
|
|
/*
|
|
* Truncate the mask to the actually supported dma_addr_t width to
|
|
* avoid generating unsupportable addresses.
|
|
*/
|
|
mask = (dma_addr_t)mask;
|
|
|
|
if (!dma_supported(dev, mask))
|
|
return -EIO;
|
|
|
|
dev->coherent_dma_mask = mask;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dma_set_coherent_mask);
|
|
|
|
size_t dma_max_mapping_size(struct device *dev)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
size_t size = SIZE_MAX;
|
|
|
|
if (dma_map_direct(dev, ops))
|
|
size = dma_direct_max_mapping_size(dev);
|
|
else if (ops && ops->max_mapping_size)
|
|
size = ops->max_mapping_size(dev);
|
|
|
|
return size;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_max_mapping_size);
|
|
|
|
size_t dma_opt_mapping_size(struct device *dev)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
size_t size = SIZE_MAX;
|
|
|
|
if (ops && ops->opt_mapping_size)
|
|
size = ops->opt_mapping_size();
|
|
|
|
return min(dma_max_mapping_size(dev), size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_opt_mapping_size);
|
|
|
|
bool dma_need_sync(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (dma_map_direct(dev, ops))
|
|
return dma_direct_need_sync(dev, dma_addr);
|
|
return ops->sync_single_for_cpu || ops->sync_single_for_device;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_need_sync);
|
|
|
|
unsigned long dma_get_merge_boundary(struct device *dev)
|
|
{
|
|
const struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (!ops || !ops->get_merge_boundary)
|
|
return 0; /* can't merge */
|
|
|
|
return ops->get_merge_boundary(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
|