* copy data to/from buffers located outside the DMA region. This
* only works for systems in which DMA memory is at the bottom of
* RAM, the remainder of memory is at the top and the DMA memory
- * can be marked as ZONE_DMA. Anything beyond that such as discontigous
+ * can be marked as ZONE_DMA. Anything beyond that such as discontiguous
* DMA windows will require custom implementations that reserve memory
* areas at early bootup.
*
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
+#include <linux/page-flags.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/list.h>
+#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
-#undef DEBUG
#undef STATS
#ifdef STATS
};
struct dmabounce_device_info {
- struct list_head node;
-
struct device *dev;
struct list_head safe_buffers;
#ifdef STATS
unsigned long total_allocs;
unsigned long map_op_count;
unsigned long bounce_count;
+ int attr_res;
#endif
struct dmabounce_pool small;
struct dmabounce_pool large;
rwlock_t lock;
};
-static LIST_HEAD(dmabounce_devs);
-
#ifdef STATS
-static void print_alloc_stats(struct dmabounce_device_info *device_info)
+static ssize_t dmabounce_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- printk(KERN_INFO
- "%s: dmabounce: sbp: %lu, lbp: %lu, other: %lu, total: %lu\n",
- device_info->dev->bus_id,
- device_info->small.allocs, device_info->large.allocs,
+ struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
+ return sprintf(buf, "%lu %lu %lu %lu %lu %lu\n",
+ device_info->small.allocs,
+ device_info->large.allocs,
device_info->total_allocs - device_info->small.allocs -
device_info->large.allocs,
- device_info->total_allocs);
+ device_info->total_allocs,
+ device_info->map_op_count,
+ device_info->bounce_count);
}
-#endif
-
-/* find the given device in the dmabounce device list */
-static inline struct dmabounce_device_info *
-find_dmabounce_dev(struct device *dev)
-{
- struct dmabounce_device_info *d;
- list_for_each_entry(d, &dmabounce_devs, node)
- if (d->dev == dev)
- return d;
-
- return NULL;
-}
+static DEVICE_ATTR(dmabounce_stats, 0400, dmabounce_show, NULL);
+#endif
/* allocate a 'safe' buffer and keep track of it */
if (pool)
pool->allocs++;
device_info->total_allocs++;
- if (device_info->total_allocs % 1000 == 0)
- print_alloc_stats(device_info);
#endif
write_lock_irqsave(&device_info->lock, flags);
-
list_add(&buf->node, &device_info->safe_buffers);
-
write_unlock_irqrestore(&device_info->lock, flags);
return buf;
/* ************************************************** */
-#ifdef STATS
-static void print_map_stats(struct dmabounce_device_info *device_info)
+static struct safe_buffer *find_safe_buffer_dev(struct device *dev,
+ dma_addr_t dma_addr, const char *where)
{
- dev_info(device_info->dev,
- "dmabounce: map_op_count=%lu, bounce_count=%lu\n",
- device_info->map_op_count, device_info->bounce_count);
+ if (!dev || !dev->archdata.dmabounce)
+ return NULL;
+ if (dma_mapping_error(dev, dma_addr)) {
+ if (dev)
+ dev_err(dev, "Trying to %s invalid mapping\n", where);
+ else
+ pr_err("unknown device: Trying to %s invalid mapping\n", where);
+ return NULL;
+ }
+ return find_safe_buffer(dev->archdata.dmabounce, dma_addr);
}
-#endif
-static inline dma_addr_t
-map_single(struct device *dev, void *ptr, size_t size,
+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 = find_dmabounce_dev(dev);
+ struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
dma_addr_t dma_addr;
int needs_bounce = 0;
}
dev_dbg(dev,
- "%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
- __func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
- buf->safe, (void *) buf->safe_dma_addr);
+ "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+ __func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+ buf->safe, buf->safe_dma_addr);
if ((dir == DMA_TO_DEVICE) ||
(dir == DMA_BIDIRECTIONAL)) {
* We don't need to sync the DMA buffer since
* it was allocated via the coherent allocators.
*/
- consistent_sync(ptr, size, dir);
+ dma_cache_maint(ptr, size, dir);
}
return dma_addr;
}
-static inline void
-unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction dir)
+static inline void unmap_single(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir)
{
- struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
- struct safe_buffer *buf = NULL;
-
- /*
- * Trying to unmap an invalid mapping
- */
- if (dma_mapping_error(dma_addr)) {
- dev_err(dev, "Trying to unmap invalid mapping\n");
- return;
- }
-
- if (device_info)
- buf = find_safe_buffer(device_info, dma_addr);
+ struct safe_buffer *buf = find_safe_buffer_dev(dev, dma_addr, "unmap");
if (buf) {
BUG_ON(buf->size != size);
+ BUG_ON(buf->direction != dir);
dev_dbg(dev,
- "%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
- __func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
- buf->safe, (void *) buf->safe_dma_addr);
+ "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+ __func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+ buf->safe, buf->safe_dma_addr);
- DO_STATS ( device_info->bounce_count++ );
+ DO_STATS(dev->archdata.dmabounce->bounce_count++);
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
- unsigned long ptr;
+ void *ptr = buf->ptr;
dev_dbg(dev,
"%s: copy back safe %p to unsafe %p size %d\n",
- __func__, buf->safe, buf->ptr, size);
- memcpy(buf->ptr, buf->safe, size);
+ __func__, buf->safe, ptr, size);
+ memcpy(ptr, buf->safe, size);
/*
* DMA buffers must have the same cache properties
* bidirectional case because we know the cache
* lines will be coherent with the data written.
*/
- ptr = (unsigned long)buf->ptr;
dmac_clean_range(ptr, ptr + size);
+ outer_clean_range(__pa(ptr), __pa(ptr) + size);
}
- free_safe_buffer(device_info, buf);
- }
-}
-
-static inline void
-sync_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction dir)
-{
- struct dmabounce_device_info *device_info = find_dmabounce_dev(dev);
- struct safe_buffer *buf = NULL;
-
- if (device_info)
- buf = find_safe_buffer(device_info, dma_addr);
-
- if (buf) {
- /*
- * Both of these checks from original code need to be
- * commented out b/c some drivers rely on the following:
- *
- * 1) Drivers may map a large chunk of memory into DMA space
- * but only sync a small portion of it. Good example is
- * allocating a large buffer, mapping it, and then
- * breaking it up into small descriptors. No point
- * in syncing the whole buffer if you only have to
- * touch one descriptor.
- *
- * 2) Buffers that are mapped as DMA_BIDIRECTIONAL are
- * usually only synced in one dir at a time.
- *
- * See drivers/net/eepro100.c for examples of both cases.
- *
- * -ds
- *
- * BUG_ON(buf->size != size);
- * BUG_ON(buf->direction != dir);
- */
-
- dev_dbg(dev,
- "%s: unsafe buffer %p (phy=%p) mapped to %p (phy=%p)\n",
- __func__, buf->ptr, (void *) virt_to_dma(dev, buf->ptr),
- buf->safe, (void *) buf->safe_dma_addr);
-
- DO_STATS ( device_info->bounce_count++ );
-
- switch (dir) {
- case DMA_FROM_DEVICE:
- dev_dbg(dev,
- "%s: copy back safe %p to unsafe %p size %d\n",
- __func__, buf->safe, buf->ptr, size);
- memcpy(buf->ptr, buf->safe, size);
- break;
- case DMA_TO_DEVICE:
- dev_dbg(dev,
- "%s: copy out unsafe %p to safe %p, size %d\n",
- __func__,buf->ptr, buf->safe, size);
- memcpy(buf->safe, buf->ptr, size);
- break;
- case DMA_BIDIRECTIONAL:
- BUG(); /* is this allowed? what does it mean? */
- default:
- BUG();
- }
- /*
- * No need to sync the safe buffer - it was allocated
- * via the coherent allocators.
- */
- } else {
- consistent_sync(dma_to_virt(dev, dma_addr), size, dir);
+ free_safe_buffer(dev->archdata.dmabounce, buf);
}
}
* substitute the safe buffer for the unsafe one.
* (basically move the buffer from an unsafe area to a safe one)
*/
-dma_addr_t
-dma_map_single(struct device *dev, void *ptr, size_t size,
+dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction dir)
{
- dma_addr_t dma_addr;
-
dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
__func__, ptr, size, dir);
- BUG_ON(dir == DMA_NONE);
-
- dma_addr = map_single(dev, ptr, size, dir);
+ BUG_ON(!valid_dma_direction(dir));
- return dma_addr;
+ return map_single(dev, ptr, size, dir);
}
+EXPORT_SYMBOL(dma_map_single);
/*
* see if a mapped address was really a "safe" buffer and if so, copy
* the safe buffer. (basically return things back to the way they
* should be)
*/
-
-void
-dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction dir)
+void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+ enum dma_data_direction dir)
{
dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
__func__, (void *) dma_addr, size, dir);
- BUG_ON(dir == DMA_NONE);
-
unmap_single(dev, dma_addr, size, dir);
}
+EXPORT_SYMBOL(dma_unmap_single);
-int
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size, enum dma_data_direction dir)
{
- int i;
+ dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x)\n",
+ __func__, page, offset, size, dir);
- dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
- __func__, sg, nents, dir);
+ BUG_ON(!valid_dma_direction(dir));
- BUG_ON(dir == DMA_NONE);
-
- for (i = 0; i < nents; i++, sg++) {
- struct page *page = sg->page;
- unsigned int offset = sg->offset;
- unsigned int length = sg->length;
- void *ptr = page_address(page) + offset;
-
- sg->dma_address =
- map_single(dev, ptr, length, dir);
+ if (PageHighMem(page)) {
+ dev_err(dev, "DMA buffer bouncing of HIGHMEM pages "
+ "is not supported\n");
+ return ~0;
}
- return nents;
+ return map_single(dev, page_address(page) + offset, size, dir);
}
+EXPORT_SYMBOL(dma_map_page);
-void
-dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+/*
+ * 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)
+ */
+void dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir)
{
- int i;
-
- dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
- __func__, sg, nents, dir);
-
- BUG_ON(dir == DMA_NONE);
-
- for (i = 0; i < nents; i++, sg++) {
- dma_addr_t dma_addr = sg->dma_address;
- unsigned int length = sg->length;
-
- unmap_single(dev, dma_addr, length, dir);
- }
-}
-
-void
-dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction dir)
-{
dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
__func__, (void *) dma_addr, size, dir);
- sync_single(dev, dma_addr, size, dir);
+ unmap_single(dev, dma_addr, size, dir);
}
+EXPORT_SYMBOL(dma_unmap_page);
-void
-dma_sync_single_for_device(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction dir)
+int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
+ unsigned long off, size_t sz, enum dma_data_direction dir)
{
- dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",
- __func__, (void *) dma_addr, size, dir);
+ struct safe_buffer *buf;
- sync_single(dev, dma_addr, size, dir);
-}
+ dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
+ __func__, addr, off, sz, dir);
-void
-dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
-{
- int i;
+ buf = find_safe_buffer_dev(dev, addr, __func__);
+ if (!buf)
+ return 1;
- dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
- __func__, sg, nents, dir);
+ BUG_ON(buf->direction != dir);
- BUG_ON(dir == DMA_NONE);
+ dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+ __func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+ buf->safe, buf->safe_dma_addr);
- for (i = 0; i < nents; i++, sg++) {
- dma_addr_t dma_addr = sg->dma_address;
- unsigned int length = sg->length;
+ DO_STATS(dev->archdata.dmabounce->bounce_count++);
- sync_single(dev, dma_addr, length, dir);
+ if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
+ dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
+ __func__, buf->safe + off, buf->ptr + off, sz);
+ memcpy(buf->ptr + off, buf->safe + off, sz);
}
+ return 0;
}
+EXPORT_SYMBOL(dmabounce_sync_for_cpu);
-void
-dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir)
+int dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
+ unsigned long off, size_t sz, enum dma_data_direction dir)
{
- int i;
+ struct safe_buffer *buf;
- dev_dbg(dev, "%s(sg=%p,nents=%d,dir=%x)\n",
- __func__, sg, nents, dir);
+ dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
+ __func__, addr, off, sz, dir);
- BUG_ON(dir == DMA_NONE);
+ buf = find_safe_buffer_dev(dev, addr, __func__);
+ if (!buf)
+ return 1;
- for (i = 0; i < nents; i++, sg++) {
- dma_addr_t dma_addr = sg->dma_address;
- unsigned int length = sg->length;
+ BUG_ON(buf->direction != dir);
- sync_single(dev, dma_addr, length, dir);
+ dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+ __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\n",
+ __func__,buf->ptr + off, buf->safe + off, sz);
+ memcpy(buf->safe + off, buf->ptr + off, sz);
}
+ return 0;
}
+EXPORT_SYMBOL(dmabounce_sync_for_device);
-static int
-dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev, const char *name,
- unsigned long size)
+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);
return pool->pool ? 0 : -ENOMEM;
}
-int
-dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
- unsigned long large_buffer_size)
+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);
+ dev_err(dev,
+ "Could not allocated dmabounce_device_info\n");
return -ENOMEM;
}
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
- list_add(&device_info->node, &dmabounce_devs);
+ dev->archdata.dmabounce = device_info;
- printk(KERN_INFO "dmabounce: registered device %s on %s bus\n",
- dev->bus_id, dev->bus->name);
+ dev_info(dev, "dmabounce: registered device\n");
return 0;
kfree(device_info);
return ret;
}
+EXPORT_SYMBOL(dmabounce_register_dev);
-void
-dmabounce_unregister_dev(struct device *dev)
+void dmabounce_unregister_dev(struct device *dev)
{
- struct dmabounce_device_info *device_info = find_dmabounce_dev(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);
+ dev_warn(dev,
+ "Never registered with dmabounce but attempting"
+ "to unregister!\n");
return;
}
if (!list_empty(&device_info->safe_buffers)) {
- printk(KERN_ERR
- "%s: Removing from dmabounce with pending buffers!\n",
- dev->bus_id);
+ dev_err(dev,
+ "Removing from dmabounce with pending buffers!\n");
BUG();
}
dma_pool_destroy(device_info->large.pool);
#ifdef STATS
- print_alloc_stats(device_info);
- print_map_stats(device_info);
+ if (device_info->attr_res == 0)
+ device_remove_file(dev, &dev_attr_dmabounce_stats);
#endif
- list_del(&device_info->node);
-
kfree(device_info);
- printk(KERN_INFO "dmabounce: device %s on %s bus unregistered\n",
- dev->bus_id, dev->bus->name);
+ dev_info(dev, "dmabounce: device unregistered\n");
}
-
-
-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>");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff