mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 01:21:01 +07:00
[ARM] dma: fix dmabounce dma_sync_xxx() implementations
The dmabounce dma_sync_xxx() implementation have been broken for quite some time; they all copy data between the DMA buffer and the CPU visible buffer no irrespective of the change of ownership. (IOW, a DMA_FROM_DEVICE mapping copies data from the DMA buffer to the CPU buffer during a call to dma_sync_single_for_device().) Fix it by getting rid of sync_single(), moving the contents into the recently created dmabounce_sync_for_xxx() functions and adjusting appropriately. This also makes it possible to properly support the DMA range sync functions. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
Russell King
parent
8c8a0ec57e
commit
125ab12acf
@ -205,6 +205,21 @@ free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer *
|
||||
|
||||
/* ************************************************** */
|
||||
|
||||
static struct safe_buffer *find_safe_buffer_dev(struct device *dev,
|
||||
dma_addr_t dma_addr, const char *where)
|
||||
{
|
||||
if (!dev || !dev->archdata.dmabounce)
|
||||
return NULL;
|
||||
if (dma_mapping_error(dev, dma_addr)) {
|
||||
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);
|
||||
}
|
||||
|
||||
static inline dma_addr_t
|
||||
map_single(struct device *dev, void *ptr, size_t size,
|
||||
enum dma_data_direction dir)
|
||||
@ -274,19 +289,7 @@ 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 = dev->archdata.dmabounce;
|
||||
struct safe_buffer *buf = NULL;
|
||||
|
||||
/*
|
||||
* Trying to unmap an invalid mapping
|
||||
*/
|
||||
if (dma_mapping_error(dev, 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);
|
||||
@ -296,7 +299,7 @@ unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
||||
__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) {
|
||||
void *ptr = buf->ptr;
|
||||
@ -317,74 +320,7 @@ unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
||||
dmac_clean_range(ptr, ptr + size);
|
||||
outer_clean_range(__pa(ptr), __pa(ptr) + size);
|
||||
}
|
||||
free_safe_buffer(device_info, buf);
|
||||
}
|
||||
}
|
||||
|
||||
static int sync_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
||||
enum dma_data_direction dir)
|
||||
{
|
||||
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
|
||||
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 (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++ );
|
||||
|
||||
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.
|
||||
*/
|
||||
return 0;
|
||||
} else {
|
||||
return 1;
|
||||
free_safe_buffer(dev->archdata.dmabounce, buf);
|
||||
}
|
||||
}
|
||||
|
||||
@ -447,18 +383,54 @@ dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
||||
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(dma=%#lx,off=%#lx,sz=%zx,dir=%x)\n",
|
||||
struct safe_buffer *buf;
|
||||
|
||||
dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
|
||||
__func__, addr, off, sz, dir);
|
||||
return sync_single(dev, addr, off + sz, dir);
|
||||
|
||||
buf = find_safe_buffer_dev(dev, addr, __func__);
|
||||
if (!buf)
|
||||
return 1;
|
||||
|
||||
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_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);
|
||||
|
||||
int dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
|
||||
unsigned long off, size_t sz, enum dma_data_direction dir)
|
||||
{
|
||||
dev_dbg(dev, "%s(dma=%#lx,off=%#lx,sz=%zx,dir=%x)\n",
|
||||
struct safe_buffer *buf;
|
||||
|
||||
dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
|
||||
__func__, addr, off, sz, dir);
|
||||
return sync_single(dev, addr, off + sz, dir);
|
||||
|
||||
buf = find_safe_buffer_dev(dev, addr, __func__);
|
||||
if (!buf)
|
||||
return 1;
|
||||
|
||||
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);
|
||||
|
||||
|
||||
@ -241,6 +241,15 @@ extern void dmabounce_unregister_dev(struct device *);
|
||||
*/
|
||||
extern int dma_needs_bounce(struct device*, dma_addr_t, size_t);
|
||||
|
||||
/*
|
||||
* The DMA API, implemented by dmabounce.c. See below for descriptions.
|
||||
*/
|
||||
extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_direction);
|
||||
extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
||||
unsigned long offset, size_t size,
|
||||
enum dma_data_direction dir);
|
||||
extern void dma_unmap_single(struct device *, dma_addr_t, size_t, enum dma_data_direction);
|
||||
|
||||
/*
|
||||
* Private functions
|
||||
*/
|
||||
@ -251,7 +260,6 @@ int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
|
||||
#else
|
||||
#define dmabounce_sync_for_cpu(dev,dma,off,sz,dir) (1)
|
||||
#define dmabounce_sync_for_device(dev,dma,off,sz,dir) (1)
|
||||
#endif /* CONFIG_DMABOUNCE */
|
||||
|
||||
|
||||
/**
|
||||
@ -268,7 +276,6 @@ int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
|
||||
* can regain ownership by calling dma_unmap_single() or
|
||||
* dma_sync_single_for_cpu().
|
||||
*/
|
||||
#ifndef CONFIG_DMABOUNCE
|
||||
static inline dma_addr_t
|
||||
dma_map_single(struct device *dev, void *cpu_addr, size_t size,
|
||||
enum dma_data_direction dir)
|
||||
@ -278,9 +285,7 @@ dma_map_single(struct device *dev, void *cpu_addr, size_t size,
|
||||
|
||||
return virt_to_dma(dev, cpu_addr);
|
||||
}
|
||||
#else
|
||||
extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_direction);
|
||||
#endif
|
||||
|
||||
|
||||
/**
|
||||
* dma_map_page - map a portion of a page for streaming DMA
|
||||
@ -297,7 +302,6 @@ extern dma_addr_t dma_map_single(struct device *,void *, size_t, enum dma_data_d
|
||||
* can regain ownership by calling dma_unmap_page() or
|
||||
* dma_sync_single_for_cpu().
|
||||
*/
|
||||
#ifndef CONFIG_DMABOUNCE
|
||||
static inline dma_addr_t
|
||||
dma_map_page(struct device *dev, struct page *page,
|
||||
unsigned long offset, size_t size,
|
||||
@ -308,11 +312,6 @@ dma_map_page(struct device *dev, struct page *page,
|
||||
|
||||
return page_to_dma(dev, page) + offset;
|
||||
}
|
||||
#else
|
||||
extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
||||
unsigned long offset, size_t size,
|
||||
enum dma_data_direction dir);
|
||||
#endif
|
||||
|
||||
/**
|
||||
* dma_unmap_single - unmap a single buffer previously mapped
|
||||
@ -328,16 +327,13 @@ extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
||||
* After this call, reads by the CPU to the buffer are guaranteed to see
|
||||
* whatever the device wrote there.
|
||||
*/
|
||||
#ifndef CONFIG_DMABOUNCE
|
||||
static inline void
|
||||
dma_unmap_single(struct device *dev, dma_addr_t handle, size_t size,
|
||||
enum dma_data_direction dir)
|
||||
{
|
||||
/* nothing to do */
|
||||
}
|
||||
#else
|
||||
extern void dma_unmap_single(struct device *, dma_addr_t, size_t, enum dma_data_direction);
|
||||
#endif
|
||||
#endif /* CONFIG_DMABOUNCE */
|
||||
|
||||
/**
|
||||
* dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
|
||||
|
||||
Loading…
Reference in New Issue
Block a user