diff options
Diffstat (limited to 'include/linux/swiotlb.h')
| -rw-r--r-- | include/linux/swiotlb.h | 142 |
1 files changed, 117 insertions, 25 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index bcef10e20ea4..b4536626f8ff 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -8,6 +8,7 @@ #include <linux/types.h> #include <linux/limits.h> #include <linux/spinlock.h> +#include <linux/workqueue.h> struct device; struct page; @@ -62,8 +63,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, #ifdef CONFIG_SWIOTLB /** - * struct io_tlb_mem - IO TLB Memory Pool Descriptor - * + * struct io_tlb_pool - IO TLB memory pool descriptor * @start: The start address of the swiotlb memory pool. Used to do a quick * range check to see if the memory was in fact allocated by this * API. @@ -73,43 +73,113 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, * @vaddr: The vaddr of the swiotlb memory pool. The swiotlb memory pool * may be remapped in the memory encrypted case and store virtual * address for bounce buffer operation. - * @nslabs: The number of IO TLB blocks (in groups of 64) between @start and - * @end. For default swiotlb, this is command line adjustable via - * setup_io_tlb_npages. - * @used: The number of used IO TLB block. - * @list: The free list describing the number of free entries available - * from each index. - * @orig_addr: The original address corresponding to a mapped entry. - * @alloc_size: Size of the allocated buffer. - * @debugfs: The dentry to debugfs. - * @late_alloc: %true if allocated using the page allocator - * @force_bounce: %true if swiotlb bouncing is forced - * @for_alloc: %true if the pool is used for memory allocation - * @nareas: The area number in the pool. - * @area_nslabs: The slot number in the area. + * @nslabs: The number of IO TLB slots between @start and @end. For the + * default swiotlb, this can be adjusted with a boot parameter, + * see setup_io_tlb_npages(). + * @late_alloc: %true if allocated using the page allocator. + * @nareas: Number of areas in the pool. + * @area_nslabs: Number of slots in each area. + * @areas: Array of memory area descriptors. + * @slots: Array of slot descriptors. + * @node: Member of the IO TLB memory pool list. + * @rcu: RCU head for swiotlb_dyn_free(). + * @transient: %true if transient memory pool. */ -struct io_tlb_mem { +struct io_tlb_pool { phys_addr_t start; phys_addr_t end; void *vaddr; unsigned long nslabs; - unsigned long used; - struct dentry *debugfs; bool late_alloc; - bool force_bounce; - bool for_alloc; unsigned int nareas; unsigned int area_nslabs; struct io_tlb_area *areas; struct io_tlb_slot *slots; +#ifdef CONFIG_SWIOTLB_DYNAMIC + struct list_head node; + struct rcu_head rcu; + bool transient; +#endif +}; + +/** + * struct io_tlb_mem - Software IO TLB allocator + * @defpool: Default (initial) IO TLB memory pool descriptor. + * @pool: IO TLB memory pool descriptor (if not dynamic). + * @nslabs: Total number of IO TLB slabs in all pools. + * @debugfs: The dentry to debugfs. + * @force_bounce: %true if swiotlb bouncing is forced + * @for_alloc: %true if the pool is used for memory allocation + * @can_grow: %true if more pools can be allocated dynamically. + * @phys_limit: Maximum allowed physical address. + * @lock: Lock to synchronize changes to the list. + * @pools: List of IO TLB memory pool descriptors (if dynamic). + * @dyn_alloc: Dynamic IO TLB pool allocation work. + * @total_used: The total number of slots in the pool that are currently used + * across all areas. Used only for calculating used_hiwater in + * debugfs. + * @used_hiwater: The high water mark for total_used. Used only for reporting + * in debugfs. + */ +struct io_tlb_mem { + struct io_tlb_pool defpool; + unsigned long nslabs; + struct dentry *debugfs; + bool force_bounce; + bool for_alloc; +#ifdef CONFIG_SWIOTLB_DYNAMIC + bool can_grow; + u64 phys_limit; + spinlock_t lock; + struct list_head pools; + struct work_struct dyn_alloc; +#endif +#ifdef CONFIG_DEBUG_FS + atomic_long_t total_used; + atomic_long_t used_hiwater; +#endif }; -extern struct io_tlb_mem io_tlb_default_mem; +#ifdef CONFIG_SWIOTLB_DYNAMIC + +struct io_tlb_pool *swiotlb_find_pool(struct device *dev, phys_addr_t paddr); + +#else + +static inline struct io_tlb_pool *swiotlb_find_pool(struct device *dev, + phys_addr_t paddr) +{ + return &dev->dma_io_tlb_mem->defpool; +} + +#endif + +/** + * is_swiotlb_buffer() - check if a physical address belongs to a swiotlb + * @dev: Device which has mapped the buffer. + * @paddr: Physical address within the DMA buffer. + * + * Check if @paddr points into a bounce buffer. + * + * Return: + * * %true if @paddr points into a bounce buffer + * * %false otherwise + */ static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) { struct io_tlb_mem *mem = dev->dma_io_tlb_mem; - return mem && paddr >= mem->start && paddr < mem->end; + if (!mem) + return false; + + if (IS_ENABLED(CONFIG_SWIOTLB_DYNAMIC)) { + /* Pairs with smp_wmb() in swiotlb_find_slots() and + * swiotlb_dyn_alloc(), which modify the RCU lists. + */ + smp_rmb(); + return swiotlb_find_pool(dev, paddr); + } + return paddr >= mem->defpool.start && paddr < mem->defpool.end; } static inline bool is_swiotlb_force_bounce(struct device *dev) @@ -121,13 +191,22 @@ static inline bool is_swiotlb_force_bounce(struct device *dev) void swiotlb_init(bool addressing_limited, unsigned int flags); void __init swiotlb_exit(void); +void swiotlb_dev_init(struct device *dev); size_t swiotlb_max_mapping_size(struct device *dev); +bool is_swiotlb_allocated(void); bool is_swiotlb_active(struct device *dev); void __init swiotlb_adjust_size(unsigned long size); +phys_addr_t default_swiotlb_base(void); +phys_addr_t default_swiotlb_limit(void); #else static inline void swiotlb_init(bool addressing_limited, unsigned int flags) { } + +static inline void swiotlb_dev_init(struct device *dev) +{ +} + static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) { return false; @@ -144,6 +223,11 @@ static inline size_t swiotlb_max_mapping_size(struct device *dev) return SIZE_MAX; } +static inline bool is_swiotlb_allocated(void) +{ + return false; +} + static inline bool is_swiotlb_active(struct device *dev) { return false; @@ -152,6 +236,16 @@ static inline bool is_swiotlb_active(struct device *dev) static inline void swiotlb_adjust_size(unsigned long size) { } + +static inline phys_addr_t default_swiotlb_base(void) +{ + return 0; +} + +static inline phys_addr_t default_swiotlb_limit(void) +{ + return 0; +} #endif /* CONFIG_SWIOTLB */ extern void swiotlb_print_info(void); @@ -180,6 +274,4 @@ static inline bool is_swiotlb_for_alloc(struct device *dev) } #endif /* CONFIG_DMA_RESTRICTED_POOL */ -extern phys_addr_t swiotlb_unencrypted_base; - #endif /* __LINUX_SWIOTLB_H */ |