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swiotlb: dynamically allocate io_tlb_default_mem

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Instead of allocating ->list and ->orig_addr separately just do one
dynamic allocation for the actual io_tlb_mem structure.  This simplifies
a lot of the initialization code, and also allows to just check
io_tlb_default_mem to see if swiotlb is in use.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-03-18 17:14:23 +01:00 • committed by Konrad Rzeszutek Wilk
parent 73f620951b
commit 2d29960af0
3 changed files with 116 additions and 228 deletions
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18
include/linux/swiotlb.h
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@ -90,28 +90,30 @@ struct io_tlb_mem {
phys_addr_t end;
unsigned long nslabs;
unsigned long used;
unsigned int *list;
unsigned int index;
phys_addr_t *orig_addr;
size_t *alloc_size;
spinlock_t lock;
struct dentry *debugfs;
bool late_alloc;
struct io_tlb_slot {
phys_addr_t orig_addr;
size_t alloc_size;
unsigned int list;
} slots[];
};
extern struct io_tlb_mem io_tlb_default_mem;
extern struct io_tlb_mem *io_tlb_default_mem;
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
return paddr >= mem->start && paddr < mem->end;
return mem && paddr >= mem->start && paddr < mem->end;
}
void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(void);
void __init swiotlb_adjust_size(unsigned long new_size);
void __init swiotlb_adjust_size(unsigned long size);
#else
#define swiotlb_force SWIOTLB_NO_FORCE
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
@ -135,7 +137,7 @@ static inline bool is_swiotlb_active(void)
return false;
}
static inline void swiotlb_adjust_size(unsigned long new_size)
static inline void swiotlb_adjust_size(unsigned long size)
{
}
#endif /* CONFIG_SWIOTLB */