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![Simon Arlott](/assets/img/avatar_default.png)
Spelling fixes in arch/arm/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
658 lines
16 KiB
C
658 lines
16 KiB
C
/*
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* arch/arm/common/dmabounce.c
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*
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* Special dma_{map/unmap/dma_sync}_* routines for systems that have
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* limited DMA windows. These functions utilize bounce buffers to
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* copy data to/from buffers located outside the DMA region. This
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* 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
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* areas at early bootup.
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*
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* Original version by Brad Parker (brad@heeltoe.com)
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* Re-written by Christopher Hoover <ch@murgatroid.com>
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* Made generic by Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright (C) 2002 Hewlett Packard Company.
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* Copyright (C) 2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/list.h>
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#include <asm/cacheflush.h>
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#undef STATS
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#ifdef STATS
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#define DO_STATS(X) do { X ; } while (0)
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#else
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#define DO_STATS(X) do { } while (0)
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#endif
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/* ************************************************** */
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struct safe_buffer {
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struct list_head node;
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/* original request */
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void *ptr;
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size_t size;
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int direction;
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/* safe buffer info */
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struct dmabounce_pool *pool;
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void *safe;
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dma_addr_t safe_dma_addr;
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};
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struct dmabounce_pool {
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unsigned long size;
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struct dma_pool *pool;
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#ifdef STATS
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unsigned long allocs;
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#endif
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};
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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;
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unsigned long map_op_count;
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unsigned long bounce_count;
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int attr_res;
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#endif
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struct dmabounce_pool small;
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struct dmabounce_pool large;
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rwlock_t lock;
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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,
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char *buf)
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{
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struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
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return sprintf(buf, "%lu %lu %lu %lu %lu %lu\n",
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device_info->small.allocs,
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device_info->large.allocs,
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device_info->total_allocs - device_info->small.allocs -
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device_info->large.allocs,
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device_info->total_allocs,
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device_info->map_op_count,
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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 */
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static inline struct safe_buffer *
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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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{
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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)\n",
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__func__, ptr, size, dir);
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if (size <= device_info->small.size) {
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pool = &device_info->small;
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} else if (size <= device_info->large.size) {
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pool = &device_info->large;
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} else {
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pool = NULL;
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}
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buf = kmalloc(sizeof(struct safe_buffer), GFP_ATOMIC);
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if (buf == NULL) {
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dev_warn(dev, "%s: kmalloc failed\n", __func__);
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return NULL;
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}
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buf->ptr = ptr;
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buf->size = size;
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buf->direction = dir;
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buf->pool = pool;
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if (pool) {
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buf->safe = dma_pool_alloc(pool->pool, GFP_ATOMIC,
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&buf->safe_dma_addr);
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} else {
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buf->safe = dma_alloc_coherent(dev, size, &buf->safe_dma_addr,
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GFP_ATOMIC);
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}
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if (buf->safe == NULL) {
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dev_warn(dev,
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"%s: could not alloc dma memory (size=%d)\n",
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__func__, size);
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kfree(buf);
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return NULL;
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}
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#ifdef STATS
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if (pool)
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pool->allocs++;
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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;
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}
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/* determine if a buffer is from our "safe" pool */
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static inline struct safe_buffer *
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find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr)
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{
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struct safe_buffer *b, *rb = NULL;
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unsigned long flags;
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read_lock_irqsave(&device_info->lock, flags);
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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) {
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rb = b;
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break;
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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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}
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static inline void
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free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer *buf)
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{
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unsigned long flags;
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dev_dbg(device_info->dev, "%s(buf=%p)\n", __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
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dma_free_coherent(device_info->dev, buf->size, buf->safe,
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buf->safe_dma_addr);
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kfree(buf);
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}
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/* ************************************************** */
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static inline dma_addr_t
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map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir)
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{
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struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
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dma_addr_t dma_addr;
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int needs_bounce = 0;
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if (device_info)
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DO_STATS ( device_info->map_op_count++ );
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dma_addr = virt_to_dma(dev, ptr);
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if (dev->dma_mask) {
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unsigned long mask = *dev->dma_mask;
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unsigned long limit;
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limit = (mask + 1) & ~mask;
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if (limit && size > limit) {
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dev_err(dev, "DMA mapping too big (requested %#x "
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"mask %#Lx)\n", size, *dev->dma_mask);
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return ~0;
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}
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/*
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* Figure out if we need to bounce from the DMA mask.
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*/
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needs_bounce = (dma_addr | (dma_addr + size - 1)) & ~mask;
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}
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if (device_info && (needs_bounce || dma_needs_bounce(dev, dma_addr, size))) {
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struct safe_buffer *buf;
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buf = alloc_safe_buffer(device_info, ptr, size, dir);
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if (buf == 0) {
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dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
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__func__, ptr);
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return 0;
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}
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dev_dbg(dev,
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"%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
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__func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
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buf->safe, (void *) buf->safe_dma_addr);
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if ((dir == DMA_TO_DEVICE) ||
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(dir == DMA_BIDIRECTIONAL)) {
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dev_dbg(dev, "%s: copy unsafe %p to safe %p, size %d\n",
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__func__, ptr, buf->safe, size);
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memcpy(buf->safe, ptr, size);
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}
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ptr = buf->safe;
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dma_addr = buf->safe_dma_addr;
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} else {
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/*
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* We don't need to sync the DMA buffer since
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* it was allocated via the coherent allocators.
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*/
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consistent_sync(ptr, size, dir);
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}
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return dma_addr;
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}
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static inline void
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unmap_single(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 dmabounce_device_info *device_info = dev->archdata.dmabounce;
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struct safe_buffer *buf = NULL;
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/*
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* Trying to unmap an invalid mapping
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*/
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if (dma_mapping_error(dma_addr)) {
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dev_err(dev, "Trying to unmap invalid mapping\n");
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return;
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}
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if (device_info)
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buf = find_safe_buffer(device_info, dma_addr);
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if (buf) {
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BUG_ON(buf->size != size);
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dev_dbg(dev,
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"%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
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__func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
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buf->safe, (void *) buf->safe_dma_addr);
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DO_STATS ( device_info->bounce_count++ );
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if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
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void *ptr = buf->ptr;
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dev_dbg(dev,
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"%s: copy back safe %p to unsafe %p size %d\n",
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__func__, buf->safe, ptr, size);
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memcpy(ptr, buf->safe, size);
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/*
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* DMA buffers must have the same cache properties
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* as if they were really used for DMA - which means
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* data must be written back to RAM. Note that
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* we don't use dmac_flush_range() here for the
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* bidirectional case because we know the cache
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* lines will be coherent with the data written.
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*/
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dmac_clean_range(ptr, ptr + size);
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outer_clean_range(__pa(ptr), __pa(ptr) + size);
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}
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free_safe_buffer(device_info, buf);
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}
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}
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static inline void
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sync_single(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 dmabounce_device_info *device_info = dev->archdata.dmabounce;
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struct safe_buffer *buf = NULL;
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if (device_info)
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buf = find_safe_buffer(device_info, dma_addr);
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if (buf) {
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/*
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* Both of these checks from original code need to be
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* commented out b/c some drivers rely on the following:
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*
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* 1) Drivers may map a large chunk of memory into DMA space
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* but only sync a small portion of it. Good example is
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* allocating a large buffer, mapping it, and then
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* breaking it up into small descriptors. No point
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* in syncing the whole buffer if you only have to
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* touch one descriptor.
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*
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* 2) Buffers that are mapped as DMA_BIDIRECTIONAL are
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* usually only synced in one dir at a time.
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*
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* See drivers/net/eepro100.c for examples of both cases.
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*
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* -ds
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*
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* BUG_ON(buf->size != size);
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* BUG_ON(buf->direction != dir);
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*/
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dev_dbg(dev,
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"%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
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__func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
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buf->safe, (void *) buf->safe_dma_addr);
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DO_STATS ( device_info->bounce_count++ );
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switch (dir) {
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case DMA_FROM_DEVICE:
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dev_dbg(dev,
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"%s: copy back safe %p to unsafe %p size %d\n",
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__func__, buf->safe, buf->ptr, size);
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memcpy(buf->ptr, buf->safe, size);
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break;
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case DMA_TO_DEVICE:
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dev_dbg(dev,
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"%s: copy out unsafe %p to safe %p, size %d\n",
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__func__,buf->ptr, buf->safe, size);
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memcpy(buf->safe, buf->ptr, size);
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break;
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case DMA_BIDIRECTIONAL:
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BUG(); /* is this allowed? what does it mean? */
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default:
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BUG();
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}
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/*
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* No need to sync the safe buffer - it was allocated
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* via the coherent allocators.
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*/
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} else {
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consistent_sync(dma_to_virt(dev, dma_addr), size, dir);
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}
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}
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/* ************************************************** */
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/*
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* see if a buffer address is in an 'unsafe' range. if it is
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* allocate a 'safe' buffer and copy the unsafe buffer into it.
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* substitute the safe buffer for the unsafe one.
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* (basically move the buffer from an unsafe area to a safe one)
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*/
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dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir)
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{
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dma_addr_t dma_addr;
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dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
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__func__, ptr, size, dir);
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BUG_ON(dir == DMA_NONE);
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dma_addr = map_single(dev, ptr, size, dir);
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return dma_addr;
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}
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/*
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* see if a mapped address was really a "safe" buffer and if so, copy
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* the data from the safe buffer back to the unsafe buffer and free up
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* the safe buffer. (basically return things back to the way they
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* should be)
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*/
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void
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dma_unmap_single(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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dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
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__func__, (void *) dma_addr, size, dir);
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BUG_ON(dir == DMA_NONE);
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unmap_single(dev, dma_addr, size, dir);
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}
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int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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int i;
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dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
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__func__, sg, nents, dir);
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BUG_ON(dir == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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struct page *page = sg->page;
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unsigned int offset = sg->offset;
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unsigned int length = sg->length;
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void *ptr = page_address(page) + offset;
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sg->dma_address =
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map_single(dev, ptr, length, dir);
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}
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return nents;
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}
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void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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int i;
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dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
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__func__, sg, nents, dir);
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BUG_ON(dir == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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dma_addr_t dma_addr = sg->dma_address;
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unsigned int length = sg->length;
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unmap_single(dev, dma_addr, length, dir);
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}
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}
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void
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dma_sync_single_for_cpu(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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dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
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__func__, (void *) dma_addr, size, dir);
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sync_single(dev, dma_addr, size, dir);
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}
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void
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dma_sync_single_for_device(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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dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
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__func__, (void *) dma_addr, size, dir);
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sync_single(dev, dma_addr, size, dir);
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}
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void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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int i;
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dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
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__func__, sg, nents, dir);
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BUG_ON(dir == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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dma_addr_t dma_addr = sg->dma_address;
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unsigned int length = sg->length;
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sync_single(dev, dma_addr, length, dir);
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}
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}
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void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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int i;
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dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
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__func__, sg, nents, dir);
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BUG_ON(dir == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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dma_addr_t dma_addr = sg->dma_address;
|
|
unsigned int length = sg->length;
|
|
|
|
sync_single(dev, dma_addr, length, dir);
|
|
}
|
|
}
|
|
|
|
static int
|
|
dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev, const char *name,
|
|
unsigned long size)
|
|
{
|
|
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;
|
|
}
|
|
|
|
int
|
|
dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
|
|
unsigned long large_buffer_size)
|
|
{
|
|
struct dmabounce_device_info *device_info;
|
|
int ret;
|
|
|
|
device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
|
|
if (!device_info) {
|
|
printk(KERN_ERR
|
|
"Could not allocated dmabounce_device_info for %s",
|
|
dev->bus_id);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
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\n",
|
|
small_buffer_size);
|
|
goto err_free;
|
|
}
|
|
|
|
if (large_buffer_size) {
|
|
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\n",
|
|
large_buffer_size);
|
|
goto err_destroy;
|
|
}
|
|
}
|
|
|
|
device_info->dev = dev;
|
|
INIT_LIST_HEAD(&device_info->safe_buffers);
|
|
rwlock_init(&device_info->lock);
|
|
|
|
#ifdef STATS
|
|
device_info->total_allocs = 0;
|
|
device_info->map_op_count = 0;
|
|
device_info->bounce_count = 0;
|
|
device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats);
|
|
#endif
|
|
|
|
dev->archdata.dmabounce = device_info;
|
|
|
|
printk(KERN_INFO "dmabounce: registered device %s on %s bus\n",
|
|
dev->bus_id, dev->bus->name);
|
|
|
|
return 0;
|
|
|
|
err_destroy:
|
|
dma_pool_destroy(device_info->small.pool);
|
|
err_free:
|
|
kfree(device_info);
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
dmabounce_unregister_dev(struct device *dev)
|
|
{
|
|
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
|
|
|
|
dev->archdata.dmabounce = NULL;
|
|
|
|
if (!device_info) {
|
|
printk(KERN_WARNING
|
|
"%s: Never registered with dmabounce but attempting" \
|
|
"to unregister!\n", dev->bus_id);
|
|
return;
|
|
}
|
|
|
|
if (!list_empty(&device_info->safe_buffers)) {
|
|
printk(KERN_ERR
|
|
"%s: Removing from dmabounce with pending buffers!\n",
|
|
dev->bus_id);
|
|
BUG();
|
|
}
|
|
|
|
if (device_info->small.pool)
|
|
dma_pool_destroy(device_info->small.pool);
|
|
if (device_info->large.pool)
|
|
dma_pool_destroy(device_info->large.pool);
|
|
|
|
#ifdef STATS
|
|
if (device_info->attr_res == 0)
|
|
device_remove_file(dev, &dev_attr_dmabounce_stats);
|
|
#endif
|
|
|
|
kfree(device_info);
|
|
|
|
printk(KERN_INFO "dmabounce: device %s on %s bus unregistered\n",
|
|
dev->bus_id, dev->bus->name);
|
|
}
|
|
|
|
|
|
EXPORT_SYMBOL(dma_map_single);
|
|
EXPORT_SYMBOL(dma_unmap_single);
|
|
EXPORT_SYMBOL(dma_map_sg);
|
|
EXPORT_SYMBOL(dma_unmap_sg);
|
|
EXPORT_SYMBOL(dma_sync_single_for_cpu);
|
|
EXPORT_SYMBOL(dma_sync_single_for_device);
|
|
EXPORT_SYMBOL(dma_sync_sg);
|
|
EXPORT_SYMBOL(dmabounce_register_dev);
|
|
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");
|