diff options
| author | ZhangPeng <zhangpeng362@huawei.com> | 2024-01-09 10:45:47 +0800 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2024-01-09 16:58:36 +0100 |
| commit | 3dc2f209208dddc73ffd1d817081711343de3242 (patch) | |
| tree | bdee8b0c9e9a663690290fd2a6bcbaa228898633 /kernel | |
| parent | b07bc2347672cc8c7293c64499f1488278c5ca3d (diff) | |
swiotlb: check alloc_size before the allocation of a new memory pool
The allocation request for swiotlb contiguous memory greater than
128*2KB cannot be fulfilled because it exceeds the maximum contiguous
memory limit. If the swiotlb memory we allocate is larger than 128*2KB,
swiotlb_find_slots() will still schedule the allocation of a new memory
pool, which will increase memory overhead.
Fix it by adding a check with alloc_size no more than 128*2KB before
scheduling the allocation of a new memory pool in swiotlb_find_slots().
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Petr Tesarik <petr.tesarik1@huawei-partners.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/swiotlb.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index e20b856255ef..96f832d828fd 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -1136,6 +1136,9 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr, int cpu, i; int index; + if (alloc_size > IO_TLB_SEGSIZE * IO_TLB_SIZE) + return -1; + cpu = raw_smp_processor_id(); for (i = 0; i < default_nareas; ++i) { index = swiotlb_search_area(dev, cpu, i, orig_addr, alloc_size, |