diff options
| author | Petr Tesarik <petr.tesarik.ext@huawei.com> | 2023-08-01 08:24:02 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2023-08-01 18:02:24 +0200 |
| commit | ad96ce3252dbab773cb343220662df3d84dd8e80 (patch) | |
| tree | 6040e0ce1f17a95c5b8f035214cfddf2c0c0296b /include/linux/swiotlb.h | |
| parent | 79636caad3618e2b38457f6e298c9b31ba82b489 (diff) | |
swiotlb: determine potential physical address limit
The value returned by default_swiotlb_limit() should be constant, because
it is used to decide whether DMA can be used. To allow allocating memory
pools on the fly, use the maximum possible physical address rather than the
highest address used by the default pool.
For swiotlb_init_remap(), this is either an arch-specific limit used by
memblock_alloc_low(), or the highest directly mapped physical address if
the initialization flags include SWIOTLB_ANY. For swiotlb_init_late(), the
highest address is determined by the GFP flags.
Signed-off-by: Petr Tesarik <petr.tesarik.ext@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/swiotlb.h')
| -rw-r--r-- | include/linux/swiotlb.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 66867d2188ba..9825fa14abe4 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -109,6 +109,7 @@ struct io_tlb_pool { * @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. * @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. @@ -123,6 +124,7 @@ struct io_tlb_mem { bool for_alloc; #ifdef CONFIG_SWIOTLB_DYNAMIC bool can_grow; + u64 phys_limit; #endif #ifdef CONFIG_DEBUG_FS atomic_long_t total_used; |