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| 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 /kernel/dma | |
| parent | 79636caad3618e2b38457f6e298c9b31ba82b489 (diff) | |
| download | linux-ad96ce3252dbab773cb343220662df3d84dd8e80.tar.gz linux-ad96ce3252dbab773cb343220662df3d84dd8e80.tar.bz2 linux-ad96ce3252dbab773cb343220662df3d84dd8e80.zip | |
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 'kernel/dma')
| -rw-r--r-- | kernel/dma/swiotlb.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 30d0fcc3ccb9..0fa081defdbd 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -334,6 +334,10 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags, #ifdef CONFIG_SWIOTLB_DYNAMIC if (!remap) io_tlb_default_mem.can_grow = true; + if (flags & SWIOTLB_ANY) + io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1); + else + io_tlb_default_mem.phys_limit = ARCH_LOW_ADDRESS_LIMIT; #endif if (!default_nareas) @@ -409,6 +413,12 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask, #ifdef CONFIG_SWIOTLB_DYNAMIC if (!remap) io_tlb_default_mem.can_grow = true; + if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp_mask & __GFP_DMA)) + io_tlb_default_mem.phys_limit = DMA_BIT_MASK(zone_dma_bits); + else if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp_mask & __GFP_DMA32)) + io_tlb_default_mem.phys_limit = DMA_BIT_MASK(32); + else + io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1); #endif if (!default_nareas) @@ -1397,7 +1407,11 @@ phys_addr_t default_swiotlb_base(void) */ phys_addr_t default_swiotlb_limit(void) { +#ifdef CONFIG_SWIOTLB_DYNAMIC + return io_tlb_default_mem.phys_limit; +#else return io_tlb_default_mem.defpool.end - 1; +#endif } #ifdef CONFIG_DEBUG_FS |