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dma-debug: add support for resource mappings

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A MMIO mapped resource can not be represented by a struct page so a new
debug type is needed to handle this. This patch add such type and
functionality to add/remove entries and how to translate them to a
physical address.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Niklas Söderlund 2016-08-10 13:22:15 +02:00 committed by Vinod Koul
parent ba409b31b3
commit 0e74b34dfc
2 changed files with 69 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
include/linux/dma-debug.h
View file

@ -56,6 +56,13 @@ extern void debug_dma_alloc_coherent(struct device *dev, size_t size,
extern void debug_dma_free_coherent(struct device *dev, size_t size,
void *virt, dma_addr_t addr);
extern void debug_dma_map_resource(struct device *dev, phys_addr_t addr,
size_t size, int direction,
dma_addr_t dma_addr);
extern void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
size_t size, int direction);
extern void debug_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
int direction);
@ -141,6 +148,18 @@ static inline void debug_dma_free_coherent(struct device *dev, size_t size,
{
}
static inline void debug_dma_map_resource(struct device *dev, phys_addr_t addr,
size_t size, int direction,
dma_addr_t dma_addr)
{
}
static inline void debug_dma_unmap_resource(struct device *dev,
dma_addr_t dma_addr, size_t size,
int direction)
{
}
static inline void debug_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle,
size_t size, int direction)

52
lib/dma-debug.c
View file

@ -43,6 +43,7 @@ enum {
dma_debug_page,
dma_debug_sg,
dma_debug_coherent,
dma_debug_resource,
};
enum map_err_types {
@ -150,8 +151,9 @@ static const char *const maperr2str[] = {
[MAP_ERR_CHECKED] = "dma map error checked",
};
static const char *type2name[4] = { "single", "page",
"scather-gather", "coherent" };
static const char *type2name[5] = { "single", "page",
"scather-gather", "coherent",
"resource" };
static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
"DMA_FROM_DEVICE", "DMA_NONE" };
@ -399,6 +401,9 @@ static void hash_bucket_del(struct dma_debug_entry *entry)
static unsigned long long phys_addr(struct dma_debug_entry *entry)
{
if (entry->type == dma_debug_resource)
return __pfn_to_phys(entry->pfn) + entry->offset;
return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
}
@ -1495,6 +1500,49 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
}
EXPORT_SYMBOL(debug_dma_free_coherent);
void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size,
int direction, dma_addr_t dma_addr)
{
struct dma_debug_entry *entry;
if (unlikely(dma_debug_disabled()))
return;
entry = dma_entry_alloc();
if (!entry)
return;
entry->type = dma_debug_resource;
entry->dev = dev;
entry->pfn = __phys_to_pfn(addr);
entry->offset = offset_in_page(addr);
entry->size = size;
entry->dev_addr = dma_addr;
entry->direction = direction;
entry->map_err_type = MAP_ERR_NOT_CHECKED;
add_dma_entry(entry);
}
EXPORT_SYMBOL(debug_dma_map_resource);
void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
size_t size, int direction)
{
struct dma_debug_entry ref = {
.type = dma_debug_resource,
.dev = dev,
.dev_addr = dma_addr,
.size = size,
.direction = direction,
};
if (unlikely(dma_debug_disabled()))
return;
check_unmap(&ref);
}
EXPORT_SYMBOL(debug_dma_unmap_resource);
void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, int direction)
{