kernel/git/stable/linux-stable.git/drivers/crypto/intel/iaa, branch master

crypto: iaa - unmap dst before software fallback on decompress

2026-08-15T01:28:36+00:00

On a hardware analytics error, decompress retries through the software fallback, which writes req->dst with the CPU while it is still mapped DMA_FROM_DEVICE. With SWIOTLB active the later dma_unmap_sg() copies the stale bounce buffer over req->dst, corrupting the result. Unmap before the fallback runs. The async path unmaps inline; the sync path signals the retry with -EAGAIN so iaa_comp_adecompress() runs the fallback after unmapping. Fixes: 2ec6761df889 ("crypto: iaa - Add support for deflate-iaa compression algorithm") Cc: stable@vger.kernel.org Signed-off-by: Vinicius Costa Gomes Signed-off-by: Herbert Xu

crypto: iaa - use bounce buffer for multi-sg decompress input

2026-08-15T01:28:36+00:00

Since commit e2c3b6b21c77 ("mm: zswap: use SG list decompression APIs from zsmalloc"), zswap passes the raw zsmalloc SG list directly to crypto drivers, so a compressed object spanning multiple pages reaches IAA as a multi-entry source. Such requests currently fall back to software decompression. As IAA hardware requires a single DMA source buffer, linearize small multi-entry sources into a pre-allocated bounce page and submit that to the hardware instead of falling back to software. Keep the software fallback only for multi-entry destinations. This recovers most of the performance lost by using the software fallback. Store the bounce-page state in the acomp request context alongside the existing compression CRC, free it through a shared source-unmap helper, and back the pages with a small module-wide mempool so the path remains available in reclaim-driven callers. Signed-off-by: Giovanni Cabiddu Signed-off-by: Vinicius Costa Gomes Signed-off-by: Herbert Xu

crypto: iaa - avoid counting fallback decompression bytes

2026-08-15T01:28:36+00:00

When decompression falls back to deflate-generic after an analytics error, the request no longer completes through IAA. Move decompression byte accounting into the successful IAA completion path in both the synchronous and asynchronous flows so decomp_bytes only reflects bytes actually processed by IAA. Signed-off-by: Giovanni Cabiddu Signed-off-by: Vinicius Costa Gomes Reviewed-by: Dave Jiang Signed-off-by: Herbert Xu

crypto: iaa - fall back to software for multi-entry scatterlists

2026-08-15T01:28:36+00:00

IAA cannot process source or destination scatterlists with more than one entry directly. Instead of failing these requests, route them through a separate deflate acomp transform and keep the request alive in software. The IAA driver has never handled multi-entry scatterlists, but the limitation was latent until commit e2c3b6b21c77 ("mm: zswap: use SG list decompression APIs from zsmalloc") made zswap pass the raw zsmalloc SG list directly to crypto drivers, so objects spanning multiple pages now reach IAA as multi-entry sources and would otherwise fail decompression. Fallback to the generic DEFLATE implementation for scatterlists with more than one entry. After the multi-entry cases fall back early, simplify the DMA mapping path to a single scatterlist entry and fall back on mapping failure as well. Add counters to track the number of requests processed by the software implementation on the compression direction. Fixes: 2ec6761df889 ("crypto: iaa - Add support for deflate-iaa compression algorithm") Fixes: e2c3b6b21c77 ("mm: zswap: use SG list decompression APIs from zsmalloc") Cc: stable@vger.kernel.org Signed-off-by: Giovanni Cabiddu Signed-off-by: Vinicius Costa Gomes Signed-off-by: Herbert Xu

crypto: iaa - fix per-node CPU counter reset in rebalance_wq_table()

2026-04-03T00:56:11+00:00

The cpu counter used to compute the IAA device index is reset to zero at the start of each NUMA node iteration. This causes CPUs on every node to map starting from IAA index 0 instead of continuing from the previous node's last index. On multi-node systems, this results in all nodes mapping their CPUs to the same initial set of IAA devices, leaving higher-indexed devices unused. Move the cpu counter initialization before the for_each_node_with_cpus() loop so that the IAA index computation accumulates correctly across all nodes. Fixes: 714ca27e9bf4 ("crypto: iaa - Optimize rebalance_wq_table()") Signed-off-by: Giovanni Cabiddu Acked-by: Vinicius Costa Gomes Signed-off-by: Herbert Xu

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

crypto: iaa - Replace sprintf with sysfs_emit in sysfs show functions

2025-12-29T00:48:35+00:00

Replace sprintf() with sysfs_emit() in verify_compress_show() and sync_mode_show(). sysfs_emit() is preferred to format sysfs output as it provides better bounds checking. No functional changes. Signed-off-by: Thorsten Blum Acked-by: Kanchana P Sridhar Signed-off-by: Herbert Xu

crypto: iaa - Remove unreachable pr_debug from iaa_crypto_cleanup_module

2025-12-19T06:47:47+00:00

iaa_unregister_compression_device() always returns 0, making the debug log message unreachable. Remove the log statement and convert iaa_unregister_compression_device() to a void function. Signed-off-by: Thorsten Blum Acked-by: Kanchana P Sridhar Signed-off-by: Herbert Xu

crypto: iaa - Simplify init_iaa_device()

2025-12-19T06:47:47+00:00

Return the result directly to simplify init_iaa_device(). Signed-off-by: Thorsten Blum Signed-off-by: Herbert Xu