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arch/arm/common/dmabounce.c
13.7 KB
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/* * arch/arm/common/dmabounce.c * * Special dma_{map/unmap/dma_sync}_* routines for systems that have * limited DMA windows. These functions utilize bounce buffers to * copy data to/from buffers located outside the DMA region. This * only works for systems in which DMA memory is at the bottom of |
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* RAM, the remainder of memory is at the top and the DMA memory |
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* can be marked as ZONE_DMA. Anything beyond that such as discontiguous |
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* DMA windows will require custom implementations that reserve memory * areas at early bootup. * * Original version by Brad Parker (brad@heeltoe.com) * Re-written by Christopher Hoover <ch@murgatroid.com> * Made generic by Deepak Saxena <dsaxena@plexity.net> * * Copyright (C) 2002 Hewlett Packard Company. * Copyright (C) 2004 MontaVista Software, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> |
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#include <linux/page-flags.h> |
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#include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/dmapool.h> #include <linux/list.h> |
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#include <linux/scatterlist.h> |
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|
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#include <asm/cacheflush.h> |
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#undef STATS |
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|
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#ifdef STATS #define DO_STATS(X) do { X ; } while (0) #else #define DO_STATS(X) do { } while (0) #endif /* ************************************************** */ struct safe_buffer { struct list_head node; /* original request */ void *ptr; size_t size; int direction; /* safe buffer info */ |
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struct dmabounce_pool *pool; |
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void *safe; dma_addr_t safe_dma_addr; }; |
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struct dmabounce_pool { unsigned long size; struct dma_pool *pool; #ifdef STATS unsigned long allocs; #endif }; |
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struct dmabounce_device_info { |
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struct device *dev; |
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struct list_head safe_buffers; |
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#ifdef STATS |
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unsigned long total_allocs; unsigned long map_op_count; unsigned long bounce_count; |
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int attr_res; |
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#endif |
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struct dmabounce_pool small; struct dmabounce_pool large; |
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rwlock_t lock; |
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int (*needs_bounce)(struct device *, dma_addr_t, size_t); |
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}; |
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#ifdef STATS |
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static ssize_t dmabounce_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct dmabounce_device_info *device_info = dev->archdata.dmabounce; return sprintf(buf, "%lu %lu %lu %lu %lu %lu ", device_info->small.allocs, device_info->large.allocs, |
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device_info->total_allocs - device_info->small.allocs - device_info->large.allocs, |
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device_info->total_allocs, device_info->map_op_count, device_info->bounce_count); |
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} |
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static DEVICE_ATTR(dmabounce_stats, 0400, dmabounce_show, NULL); |
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#endif |
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/* allocate a 'safe' buffer and keep track of it */ static inline struct safe_buffer * alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr, |
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size_t size, enum dma_data_direction dir) |
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{ struct safe_buffer *buf; |
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struct dmabounce_pool *pool; |
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struct device *dev = device_info->dev; |
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unsigned long flags; |
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dev_dbg(dev, "%s(ptr=%p, size=%d, dir=%d) ", __func__, ptr, size, dir); |
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if (size <= device_info->small.size) { pool = &device_info->small; } else if (size <= device_info->large.size) { pool = &device_info->large; } else { pool = NULL; } |
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buf = kmalloc(sizeof(struct safe_buffer), GFP_ATOMIC); if (buf == NULL) { dev_warn(dev, "%s: kmalloc failed ", __func__); return NULL; } |
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buf->ptr = ptr; buf->size = size; buf->direction = dir; buf->pool = pool; |
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|
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if (pool) { buf->safe = dma_pool_alloc(pool->pool, GFP_ATOMIC, &buf->safe_dma_addr); |
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} else { |
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buf->safe = dma_alloc_coherent(dev, size, &buf->safe_dma_addr, GFP_ATOMIC); |
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} |
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if (buf->safe == NULL) { dev_warn(dev, "%s: could not alloc dma memory (size=%d) ", __func__, size); |
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kfree(buf); return NULL; } #ifdef STATS |
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if (pool) pool->allocs++; device_info->total_allocs++; |
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#endif |
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write_lock_irqsave(&device_info->lock, flags); |
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list_add(&buf->node, &device_info->safe_buffers); |
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write_unlock_irqrestore(&device_info->lock, flags); |
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return buf; } /* determine if a buffer is from our "safe" pool */ static inline struct safe_buffer * find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr) { |
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struct safe_buffer *b, *rb = NULL; |
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unsigned long flags; read_lock_irqsave(&device_info->lock, flags); |
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|
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list_for_each_entry(b, &device_info->safe_buffers, node) |
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if (b->safe_dma_addr == safe_dma_addr) { rb = b; |
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break; |
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} |
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|
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read_unlock_irqrestore(&device_info->lock, flags); |
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return rb; |
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} static inline void free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer *buf) { |
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unsigned long flags; |
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dev_dbg(device_info->dev, "%s(buf=%p) ", __func__, buf); |
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write_lock_irqsave(&device_info->lock, flags); |
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list_del(&buf->node); |
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write_unlock_irqrestore(&device_info->lock, flags); |
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if (buf->pool) |
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dma_pool_free(buf->pool->pool, buf->safe, buf->safe_dma_addr); |
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else dma_free_coherent(device_info->dev, buf->size, buf->safe, buf->safe_dma_addr); kfree(buf); } /* ************************************************** */ |
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static struct safe_buffer *find_safe_buffer_dev(struct device *dev, dma_addr_t dma_addr, const char *where) { if (!dev || !dev->archdata.dmabounce) return NULL; if (dma_mapping_error(dev, dma_addr)) { |
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dev_err(dev, "Trying to %s invalid mapping ", where); |
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return NULL; } return find_safe_buffer(dev->archdata.dmabounce, dma_addr); } |
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static int needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size) |
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{ |
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if (!dev || !dev->archdata.dmabounce) return 0; |
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if (dev->dma_mask) { |
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unsigned long limit, mask = *dev->dma_mask; |
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limit = (mask + 1) & ~mask; if (limit && size > limit) { dev_err(dev, "DMA mapping too big (requested %#x " "mask %#Lx) ", size, *dev->dma_mask); |
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return -E2BIG; |
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} |
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/* Figure out if we need to bounce from the DMA mask. */ if ((dma_addr | (dma_addr + size - 1)) & ~mask) return 1; |
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} |
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return !!dev->archdata.dmabounce->needs_bounce(dev, dma_addr, size); |
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} static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction dir) { struct dmabounce_device_info *device_info = dev->archdata.dmabounce; |
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struct safe_buffer *buf; |
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if (device_info) DO_STATS ( device_info->map_op_count++ ); |
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buf = alloc_safe_buffer(device_info, ptr, size, dir); |
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if (buf == NULL) { |
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dev_err(dev, "%s: unable to map unsafe buffer %p! ", __func__, ptr); |
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return ~0; |
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} |
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x) ", __func__, buf->ptr, virt_to_dma(dev, buf->ptr), buf->safe, buf->safe_dma_addr); |
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if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) { dev_dbg(dev, "%s: copy unsafe %p to safe %p, size %d ", __func__, ptr, buf->safe, size); memcpy(buf->safe, ptr, size); |
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} |
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return buf->safe_dma_addr; |
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} |
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static inline void unmap_single(struct device *dev, struct safe_buffer *buf, |
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size_t size, enum dma_data_direction dir) |
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{ |
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BUG_ON(buf->size != size); BUG_ON(buf->direction != dir); |
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x) ", __func__, buf->ptr, virt_to_dma(dev, buf->ptr), buf->safe, buf->safe_dma_addr); |
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DO_STATS(dev->archdata.dmabounce->bounce_count++); |
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if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) { void *ptr = buf->ptr; |
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dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d ", __func__, buf->safe, ptr, size); memcpy(ptr, buf->safe, size); |
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/* * Since we may have written to a page cache page, * we need to ensure that the data will be coherent * with user mappings. */ __cpuc_flush_dcache_area(ptr, size); |
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} |
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free_safe_buffer(dev->archdata.dmabounce, buf); |
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} /* ************************************************** */ /* * see if a buffer address is in an 'unsafe' range. if it is * allocate a 'safe' buffer and copy the unsafe buffer into it. * substitute the safe buffer for the unsafe one. * (basically move the buffer from an unsafe area to a safe one) */ |
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dma_addr_t __dma_map_page(struct device *dev, struct page *page, |
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unsigned long offset, size_t size, enum dma_data_direction dir) |
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{ |
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dma_addr_t dma_addr; int ret; |
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dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x) ", __func__, page, offset, size, dir); |
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dma_addr = pfn_to_dma(dev, page_to_pfn(page)) + offset; ret = needs_bounce(dev, dma_addr, size); if (ret < 0) return ~0; if (ret == 0) { __dma_page_cpu_to_dev(page, offset, size, dir); return dma_addr; } |
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if (PageHighMem(page)) { |
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dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported "); |
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return ~0; } |
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return map_single(dev, page_address(page) + offset, size, dir); } |
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EXPORT_SYMBOL(__dma_map_page); |
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|
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/* * see if a mapped address was really a "safe" buffer and if so, copy * the data from the safe buffer back to the unsafe buffer and free up * the safe buffer. (basically return things back to the way they * should be) */ |
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void __dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, |
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enum dma_data_direction dir) |
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{ |
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struct safe_buffer *buf; |
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dev_dbg(dev, "%s(dma=%#x,size=%d,dir=%x) ", __func__, dma_addr, size, dir); |
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buf = find_safe_buffer_dev(dev, dma_addr, __func__); if (!buf) { __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, dma_addr)), dma_addr & ~PAGE_MASK, size, dir); return; } unmap_single(dev, buf, size, dir); |
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} |
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EXPORT_SYMBOL(__dma_unmap_page); |
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|
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int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr, unsigned long off, size_t sz, enum dma_data_direction dir) |
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{ |
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struct safe_buffer *buf; dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x) ", |
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__func__, addr, off, sz, dir); |
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buf = find_safe_buffer_dev(dev, addr, __func__); if (!buf) return 1; |
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BUG_ON(buf->direction != dir); |
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x) ", __func__, buf->ptr, virt_to_dma(dev, buf->ptr), buf->safe, buf->safe_dma_addr); DO_STATS(dev->archdata.dmabounce->bounce_count++); if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) { dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d ", __func__, buf->safe + off, buf->ptr + off, sz); memcpy(buf->ptr + off, buf->safe + off, sz); } return 0; |
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} |
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EXPORT_SYMBOL(dmabounce_sync_for_cpu); |
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|
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int dmabounce_sync_for_device(struct device *dev, dma_addr_t addr, unsigned long off, size_t sz, enum dma_data_direction dir) |
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{ |
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struct safe_buffer *buf; dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x) ", |
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__func__, addr, off, sz, dir); |
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buf = find_safe_buffer_dev(dev, addr, __func__); if (!buf) return 1; |
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BUG_ON(buf->direction != dir); |
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x) ", __func__, buf->ptr, virt_to_dma(dev, buf->ptr), buf->safe, buf->safe_dma_addr); DO_STATS(dev->archdata.dmabounce->bounce_count++); if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) { dev_dbg(dev, "%s: copy out unsafe %p to safe %p, size %d ", __func__,buf->ptr + off, buf->safe + off, sz); memcpy(buf->safe + off, buf->ptr + off, sz); } return 0; |
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} |
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EXPORT_SYMBOL(dmabounce_sync_for_device); |
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|
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static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev, const char *name, unsigned long size) |
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{ pool->size = size; DO_STATS(pool->allocs = 0); pool->pool = dma_pool_create(name, dev, size, 0 /* byte alignment */, 0 /* no page-crossing issues */); return pool->pool ? 0 : -ENOMEM; } |
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int dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size, |
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unsigned long large_buffer_size, int (*needs_bounce_fn)(struct device *, dma_addr_t, size_t)) |
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{ struct dmabounce_device_info *device_info; |
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int ret; |
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device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC); if (!device_info) { |
fc3a8828b driver core: fix ... |
432 433 434 |
dev_err(dev, "Could not allocated dmabounce_device_info "); |
1da177e4c Linux-2.6.12-rc2 |
435 436 |
return -ENOMEM; } |
cb7610d01 [ARM] Clean up dm... |
437 438 439 440 441 442 443 444 |
ret = dmabounce_init_pool(&device_info->small, dev, "small_dmabounce_pool", small_buffer_size); if (ret) { dev_err(dev, "dmabounce: could not allocate DMA pool for %ld byte objects ", small_buffer_size); goto err_free; |
1da177e4c Linux-2.6.12-rc2 |
445 446 447 |
} if (large_buffer_size) { |
cb7610d01 [ARM] Clean up dm... |
448 449 450 451 452 453 454 455 456 |
ret = dmabounce_init_pool(&device_info->large, dev, "large_dmabounce_pool", large_buffer_size); if (ret) { dev_err(dev, "dmabounce: could not allocate DMA pool for %ld byte objects ", large_buffer_size); goto err_destroy; |
1da177e4c Linux-2.6.12-rc2 |
457 458 459 460 |
} } device_info->dev = dev; |
1da177e4c Linux-2.6.12-rc2 |
461 |
INIT_LIST_HEAD(&device_info->safe_buffers); |
823588c18 [ARM] 3537/1: Rew... |
462 |
rwlock_init(&device_info->lock); |
0703ed2a6 ARM: dmabounce: g... |
463 |
device_info->needs_bounce = needs_bounce_fn; |
1da177e4c Linux-2.6.12-rc2 |
464 465 |
#ifdef STATS |
1da177e4c Linux-2.6.12-rc2 |
466 467 468 |
device_info->total_allocs = 0; device_info->map_op_count = 0; device_info->bounce_count = 0; |
017cc022b [ARM] Convert dma... |
469 |
device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats); |
1da177e4c Linux-2.6.12-rc2 |
470 |
#endif |
ab2c21529 [ARM] Add a refer... |
471 |
dev->archdata.dmabounce = device_info; |
1da177e4c Linux-2.6.12-rc2 |
472 |
|
fc3a8828b driver core: fix ... |
473 474 |
dev_info(dev, "dmabounce: registered device "); |
1da177e4c Linux-2.6.12-rc2 |
475 476 |
return 0; |
cb7610d01 [ARM] Clean up dm... |
477 478 479 480 481 482 |
err_destroy: dma_pool_destroy(device_info->small.pool); err_free: kfree(device_info); return ret; |
1da177e4c Linux-2.6.12-rc2 |
483 |
} |
3216a97bb [ARM] dma: coding... |
484 |
EXPORT_SYMBOL(dmabounce_register_dev); |
1da177e4c Linux-2.6.12-rc2 |
485 |
|
3216a97bb [ARM] dma: coding... |
486 |
void dmabounce_unregister_dev(struct device *dev) |
1da177e4c Linux-2.6.12-rc2 |
487 |
{ |
ab2c21529 [ARM] Add a refer... |
488 489 490 |
struct dmabounce_device_info *device_info = dev->archdata.dmabounce; dev->archdata.dmabounce = NULL; |
1da177e4c Linux-2.6.12-rc2 |
491 492 |
if (!device_info) { |
fc3a8828b driver core: fix ... |
493 494 495 496 |
dev_warn(dev, "Never registered with dmabounce but attempting" "to unregister! "); |
1da177e4c Linux-2.6.12-rc2 |
497 498 499 500 |
return; } if (!list_empty(&device_info->safe_buffers)) { |
fc3a8828b driver core: fix ... |
501 502 503 |
dev_err(dev, "Removing from dmabounce with pending buffers! "); |
1da177e4c Linux-2.6.12-rc2 |
504 505 |
BUG(); } |
cb7610d01 [ARM] Clean up dm... |
506 507 508 509 |
if (device_info->small.pool) dma_pool_destroy(device_info->small.pool); if (device_info->large.pool) dma_pool_destroy(device_info->large.pool); |
1da177e4c Linux-2.6.12-rc2 |
510 511 |
#ifdef STATS |
017cc022b [ARM] Convert dma... |
512 513 |
if (device_info->attr_res == 0) device_remove_file(dev, &dev_attr_dmabounce_stats); |
1da177e4c Linux-2.6.12-rc2 |
514 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
515 |
kfree(device_info); |
fc3a8828b driver core: fix ... |
516 517 |
dev_info(dev, "dmabounce: device unregistered "); |
1da177e4c Linux-2.6.12-rc2 |
518 |
} |
1da177e4c Linux-2.6.12-rc2 |
519 520 521 522 523 |
EXPORT_SYMBOL(dmabounce_unregister_dev); MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>, Deepak Saxena <dsaxena@plexity.net>"); MODULE_DESCRIPTION("Special dma_{map/unmap/dma_sync}_* routines for systems with limited DMA windows"); MODULE_LICENSE("GPL"); |