diff options
| author | Petr Tesarik <petr.tesarik.ext@huawei.com> | 2023-08-01 08:23:57 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2023-08-01 18:02:09 +0200 |
| commit | 05ee774122bd4a2f298668d6d5fc9e7b685a5e31 (patch) | |
| tree | 7144d0ef02ca1d93c0355de1ad5fa8349dadd3db /kernel/dma | |
| parent | 0c6874a6ac0474b54c8d1ba33e243ec578ff815a (diff) | |
swiotlb: make io_tlb_default_mem local to swiotlb.c
SWIOTLB implementation details should not be exposed to the rest of the
kernel. This will allow to make changes to the implementation without
modifying non-swiotlb code.
To avoid breaking existing users, provide helper functions for the few
required fields.
As a bonus, using a helper function to initialize struct device allows to
get rid of an #ifdef in driver core.
Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/swiotlb.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index ee57fd9949dc..0840bc15fb53 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -71,7 +71,7 @@ struct io_tlb_slot { static bool swiotlb_force_bounce; static bool swiotlb_force_disable; -struct io_tlb_mem io_tlb_default_mem; +static struct io_tlb_mem io_tlb_default_mem; static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT; static unsigned long default_nareas; @@ -489,6 +489,15 @@ void __init swiotlb_exit(void) memset(mem, 0, sizeof(*mem)); } +/** + * swiotlb_dev_init() - initialize swiotlb fields in &struct device + * @dev: Device to be initialized. + */ +void swiotlb_dev_init(struct device *dev) +{ + dev->dma_io_tlb_mem = &io_tlb_default_mem; +} + /* * Return the offset into a iotlb slot required to keep the device happy. */ @@ -953,6 +962,14 @@ size_t swiotlb_max_mapping_size(struct device *dev) return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE - min_align; } +/** + * is_swiotlb_allocated() - check if the default software IO TLB is initialized + */ +bool is_swiotlb_allocated(void) +{ + return io_tlb_default_mem.nslabs; +} + bool is_swiotlb_active(struct device *dev) { struct io_tlb_mem *mem = dev->dma_io_tlb_mem; @@ -960,6 +977,26 @@ bool is_swiotlb_active(struct device *dev) return mem && mem->nslabs; } +/** + * default_swiotlb_base() - get the base address of the default SWIOTLB + * + * Get the lowest physical address used by the default software IO TLB pool. + */ +phys_addr_t default_swiotlb_base(void) +{ + return io_tlb_default_mem.start; +} + +/** + * default_swiotlb_limit() - get the address limit of the default SWIOTLB + * + * Get the highest physical address used by the default software IO TLB pool. + */ +phys_addr_t default_swiotlb_limit(void) +{ + return io_tlb_default_mem.end - 1; +} + #ifdef CONFIG_DEBUG_FS static int io_tlb_used_get(void *data, u64 *val) |