linux/kernel/dma
Dexuan Cui a1255ccab8 swiotlb: do not set total_used to 0 in swiotlb_create_debugfs_files()
Sometimes the readout of /sys/kernel/debug/swiotlb/io_tlb_used and
io_tlb_used_hiwater can be a huge number (e.g. 18446744073709551615),
which is actually a negative number if we use "%ld" to print the number.

When swiotlb_create_default_debugfs() is running from late_initcall,
mem->total_used may already be non-zero, because the storage driver
may have already started to perform I/O operations: if the storage
driver is built-in, its probe() callback is called before late_initcall.

swiotlb_create_debugfs_files() should not blindly set mem->total_used
and mem->used_hiwater to 0; actually it doesn't have to initialize the
fields at all, because the fields, as part of the global struct
io_tlb_default_mem, have been implicitly initialized to zero.

Also don't explicitly set mem->transient_nslabs to 0.

Fixes: 8b0977ecc8 ("swiotlb: track and report io_tlb_used high water marks in debugfs")
Fixes: 02e7656970 ("swiotlb: add debugfs to track swiotlb transient pool usage")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Petr Tesarik <petr.tesarik1@huawei-partners.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2024-04-02 17:08:09 +02:00
..
coherent.c dma-mapping: clear dev->dma_mem to NULL after freeing it 2023-12-15 12:32:45 +01:00
contiguous.c mm/cma: drop CONFIG_CMA_DEBUG 2024-02-22 10:24:53 -08:00
debug.c dma-mapping fixes for Linux 6.8 2024-01-18 16:49:34 -08:00
debug.h dma-debug: teach add_dma_entry() about DMA_ATTR_SKIP_CPU_SYNC 2021-10-18 12:46:45 +02:00
direct.c dma-direct: Leak pages on dma_set_decrypted() failure 2024-02-28 05:31:38 -08:00
direct.h dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM 2023-11-06 08:38:16 +01:00
dummy.c dma-mapping: return error code from dma_dummy_map_sg() 2021-08-09 17:13:06 +02:00
Kconfig dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbol 2023-10-22 16:38:54 +02:00
Makefile dma-mapping: remove CONFIG_DMA_REMAP 2022-03-03 14:00:57 +03:00
map_benchmark.c dma-mapping: benchmark: remove MODULE_LICENSE in non-modules 2023-04-13 13:13:51 -07:00
mapping.c dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM 2023-11-06 08:38:16 +01:00
ops_helpers.c dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable} 2021-07-16 11:30:26 +02:00
pool.c mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
remap.c dma-remap: use kvmalloc_array/kvfree for larger dma memory remap 2023-06-07 15:06:28 +02:00
swiotlb.c swiotlb: do not set total_used to 0 in swiotlb_create_debugfs_files() 2024-04-02 17:08:09 +02:00