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dma-debug: move initialization to common code

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Most mainstream architectures are using 65536 entries, so lets stick to
that.  If someone is really desperate to override it that can still be
done through <asm/dma-mapping.h>, but I'd rather see a really good
rationale for that.

dma_debug_init is now called as a core_initcall, which for many
architectures means much earlier, and provides dma-debug functionality
earlier in the boot process.  This should be safe as it only relies
on the memory allocator already being available.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig
2018-04-16 17:22:28 +02:00
parent 325ef1857f
commit 15b28bbcd5
17 changed files with 14 additions and 143 deletions
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21
lib/dma-debug.c
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@@ -41,6 +41,11 @@
#define HASH_FN_SHIFT 13
#define HASH_FN_MASK (HASH_SIZE - 1)
/* allow architectures to override this if absolutely required */
#ifndef PREALLOC_DMA_DEBUG_ENTRIES
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
#endif
enum {
dma_debug_single,
dma_debug_page,
@@ -1004,18 +1009,16 @@ void dma_debug_add_bus(struct bus_type *bus)
bus_register_notifier(bus, nb);
}
/*
* Let the architectures decide how many entries should be preallocated.
*/
void dma_debug_init(u32 num_entries)
static int dma_debug_init(void)
{
u32 num_entries;
int i;
/* Do not use dma_debug_initialized here, since we really want to be
* called to set dma_debug_initialized
*/
if (global_disable)
return;
return 0;
for (i = 0; i < HASH_SIZE; ++i) {
INIT_LIST_HEAD(&dma_entry_hash[i].list);
@@ -1026,17 +1029,19 @@ void dma_debug_init(u32 num_entries)
pr_err("DMA-API: error creating debugfs entries - disabling\n");
global_disable = true;
return;
return 0;
}
if (req_entries)
num_entries = req_entries;
else
num_entries = PREALLOC_DMA_DEBUG_ENTRIES;
if (prealloc_memory(num_entries) != 0) {
pr_err("DMA-API: debugging out of memory error - disabled\n");
global_disable = true;
return;
return 0;
}
nr_total_entries = num_free_entries;
@@ -1044,7 +1049,9 @@ void dma_debug_init(u32 num_entries)
dma_debug_initialized = true;
pr_info("DMA-API: debugging enabled by kernel config\n");
return 0;
}
core_initcall(dma_debug_init);
static __init int dma_debug_cmdline(char *str)
{