forked from Minki/linux
ARM/dma-mapping: remove dmabounce
Remove the now unused dmabounce code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Christoph Hellwig
parent
9ba26f5cec
commit
e3217540c2
@ -3,10 +3,6 @@ config SA1111
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bool
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select ZONE_DMA if ARCH_SA1100
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config DMABOUNCE
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bool
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select ZONE_DMA
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config KRAIT_L2_ACCESSORS
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bool
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@ -6,7 +6,6 @@
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obj-y += firmware.o
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obj-$(CONFIG_SA1111) += sa1111.o
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obj-$(CONFIG_DMABOUNCE) += dmabounce.o
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obj-$(CONFIG_KRAIT_L2_ACCESSORS) += krait-l2-accessors.o
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obj-$(CONFIG_SHARP_LOCOMO) += locomo.o
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obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o
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@ -1,582 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/page-flags.h>
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#include <linux/device.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-map-ops.h>
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#include <linux/dmapool.h>
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#include <linux/list.h>
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#include <linux/scatterlist.h>
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#include <asm/cacheflush.h>
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#include <asm/dma-iommu.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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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,
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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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b->safe_dma_addr + b->size > 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 struct safe_buffer *find_safe_buffer_dev(struct device *dev,
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dma_addr_t dma_addr, const char *where)
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{
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if (!dev || !dev->archdata.dmabounce)
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return NULL;
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if (dma_mapping_error(dev, dma_addr)) {
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dev_err(dev, "Trying to %s invalid mapping\n", where);
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return NULL;
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}
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return find_safe_buffer(dev->archdata.dmabounce, dma_addr);
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}
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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)
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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;
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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 -E2BIG;
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}
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/* Figure out if we need to bounce from the DMA mask. */
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if ((dma_addr | (dma_addr + size - 1)) & ~mask)
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return 1;
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}
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return !!dev->archdata.dmabounce->needs_bounce(dev, dma_addr, size);
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}
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static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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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;
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if (device_info)
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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!\n",
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__func__, ptr);
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return DMA_MAPPING_ERROR;
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}
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
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__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
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buf->safe, buf->safe_dma_addr);
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if ((dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) &&
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!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
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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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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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unsigned long attrs)
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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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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
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__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
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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) &&
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!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
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void *ptr = buf->ptr;
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dev_dbg(dev, "%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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* Since we may have written to a page cache page,
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* we need to ensure that the data will be coherent
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* with user mappings.
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*/
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__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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}
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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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static dma_addr_t dmabounce_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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unsigned long attrs)
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{
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dma_addr_t dma_addr;
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int ret;
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dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x)\n",
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__func__, page, offset, size, dir);
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dma_addr = pfn_to_dma(dev, page_to_pfn(page)) + offset;
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ret = needs_bounce(dev, dma_addr, size);
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if (ret < 0)
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return DMA_MAPPING_ERROR;
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if (ret == 0) {
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arm_dma_ops.sync_single_for_device(dev, dma_addr, size, dir);
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return dma_addr;
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}
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if (PageHighMem(page)) {
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dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported\n");
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return DMA_MAPPING_ERROR;
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}
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return map_single(dev, page_address(page) + offset, size, dir, attrs);
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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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static void dmabounce_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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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)\n",
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__func__, dma_addr, size, dir);
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buf = find_safe_buffer_dev(dev, dma_addr, __func__);
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if (!buf) {
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arm_dma_ops.sync_single_for_cpu(dev, dma_addr, size, dir);
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return;
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}
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unmap_single(dev, buf, size, dir, attrs);
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}
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static int __dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
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size_t sz, enum dma_data_direction dir)
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{
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struct safe_buffer *buf;
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unsigned long off;
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dev_dbg(dev, "%s(dma=%#x,sz=%zx,dir=%x)\n",
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__func__, addr, sz, dir);
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buf = find_safe_buffer_dev(dev, addr, __func__);
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if (!buf)
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return 1;
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off = addr - buf->safe_dma_addr;
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BUG_ON(buf->direction != dir);
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
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__func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
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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) {
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dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
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__func__, buf->safe + off, buf->ptr + off, sz);
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memcpy(buf->ptr + off, buf->safe + off, sz);
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}
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return 0;
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}
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static void dmabounce_sync_for_cpu(struct device *dev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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if (!__dmabounce_sync_for_cpu(dev, handle, size, dir))
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return;
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arm_dma_ops.sync_single_for_cpu(dev, handle, size, dir);
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}
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static int __dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
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size_t sz, enum dma_data_direction dir)
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{
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struct safe_buffer *buf;
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unsigned long off;
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dev_dbg(dev, "%s(dma=%#x,sz=%zx,dir=%x)\n",
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__func__, addr, sz, dir);
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buf = find_safe_buffer_dev(dev, addr, __func__);
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if (!buf)
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return 1;
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off = addr - buf->safe_dma_addr;
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BUG_ON(buf->direction != dir);
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dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
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__func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
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buf->safe, buf->safe_dma_addr);
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DO_STATS(dev->archdata.dmabounce->bounce_count++);
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if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) {
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dev_dbg(dev, "%s: copy out unsafe %p to safe %p, size %d\n",
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__func__,buf->ptr + off, buf->safe + off, sz);
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memcpy(buf->safe + off, buf->ptr + off, sz);
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}
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return 0;
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}
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static void dmabounce_sync_for_device(struct device *dev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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if (!__dmabounce_sync_for_device(dev, handle, size, dir))
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return;
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arm_dma_ops.sync_single_for_device(dev, handle, size, dir);
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}
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static int dmabounce_dma_supported(struct device *dev, u64 dma_mask)
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{
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if (dev->archdata.dmabounce)
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return 0;
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return arm_dma_ops.dma_supported(dev, dma_mask);
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}
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static const struct dma_map_ops dmabounce_ops = {
|
||||
.alloc = arm_dma_alloc,
|
||||
.free = arm_dma_free,
|
||||
.mmap = arm_dma_mmap,
|
||||
.get_sgtable = arm_dma_get_sgtable,
|
||||
.map_page = dmabounce_map_page,
|
||||
.unmap_page = dmabounce_unmap_page,
|
||||
.sync_single_for_cpu = dmabounce_sync_for_cpu,
|
||||
.sync_single_for_device = dmabounce_sync_for_device,
|
||||
.map_sg = arm_dma_map_sg,
|
||||
.unmap_sg = arm_dma_unmap_sg,
|
||||
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
|
||||
.sync_sg_for_device = arm_dma_sync_sg_for_device,
|
||||
.dma_supported = dmabounce_dma_supported,
|
||||
};
|
||||
|
||||
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,
|
||||
int (*needs_bounce_fn)(struct device *, dma_addr_t, size_t))
|
||||
{
|
||||
struct dmabounce_device_info *device_info;
|
||||
int ret;
|
||||
|
||||
device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
|
||||
if (!device_info) {
|
||||
dev_err(dev,
|
||||
"Could not allocated dmabounce_device_info\n");
|
||||
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);
|
||||
device_info->needs_bounce = needs_bounce_fn;
|
||||
|
||||
#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;
|
||||
set_dma_ops(dev, &dmabounce_ops);
|
||||
|
||||
dev_info(dev, "dmabounce: registered device\n");
|
||||
|
||||
return 0;
|
||||
|
||||
err_destroy:
|
||||
dma_pool_destroy(device_info->small.pool);
|
||||
err_free:
|
||||
kfree(device_info);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(dmabounce_register_dev);
|
||||
|
||||
void dmabounce_unregister_dev(struct device *dev)
|
||||
{
|
||||
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
|
||||
|
||||
dev->archdata.dmabounce = NULL;
|
||||
set_dma_ops(dev, NULL);
|
||||
|
||||
if (!device_info) {
|
||||
dev_warn(dev,
|
||||
"Never registered with dmabounce but attempting"
|
||||
"to unregister!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (!list_empty(&device_info->safe_buffers)) {
|
||||
dev_err(dev,
|
||||
"Removing from dmabounce with pending buffers!\n");
|
||||
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);
|
||||
|
||||
dev_info(dev, "dmabounce: device unregistered\n");
|
||||
}
|
||||
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");
|
||||
@ -6,9 +6,6 @@
|
||||
#define ASMARM_DEVICE_H
|
||||
|
||||
struct dev_archdata {
|
||||
#ifdef CONFIG_DMABOUNCE
|
||||
struct dmabounce_device_info *dmabounce;
|
||||
#endif
|
||||
#ifdef CONFIG_ARM_DMA_USE_IOMMU
|
||||
struct dma_iommu_mapping *mapping;
|
||||
#endif
|
||||
|
||||
@ -80,35 +80,6 @@ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
|
||||
*
|
||||
*/
|
||||
|
||||
/**
|
||||
* dmabounce_register_dev
|
||||
*
|
||||
* @dev: valid struct device pointer
|
||||
* @small_buf_size: size of buffers to use with small buffer pool
|
||||
* @large_buf_size: size of buffers to use with large buffer pool (can be 0)
|
||||
* @needs_bounce_fn: called to determine whether buffer needs bouncing
|
||||
*
|
||||
* This function should be called by low-level platform code to register
|
||||
* a device as requireing DMA buffer bouncing. The function will allocate
|
||||
* appropriate DMA pools for the device.
|
||||
*/
|
||||
extern int dmabounce_register_dev(struct device *, unsigned long,
|
||||
unsigned long, int (*)(struct device *, dma_addr_t, size_t));
|
||||
|
||||
/**
|
||||
* dmabounce_unregister_dev
|
||||
*
|
||||
* @dev: valid struct device pointer
|
||||
*
|
||||
* This function should be called by low-level platform code when device
|
||||
* that was previously registered with dmabounce_register_dev is removed
|
||||
* from the system.
|
||||
*
|
||||
*/
|
||||
extern void dmabounce_unregister_dev(struct device *);
|
||||
|
||||
|
||||
|
||||
/*
|
||||
* The scatter list versions of the above methods.
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user