This series fixes the RCU stalls triggered by the x86 crypto modules discussed in https://lore.kernel.org/all/MW5PR84MB18426EBBA3303770A8BC0BDFAB759@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ Two root causes were: - too much data processed between kernel_fpu_begin and kernel_fpu_end calls (which are heavily used by the x86 optimized drivers) - tcrypt not calling cond_resched during speed test loops These problems have always been lurking, but improving the loading of the x86/sha512 module led to it happening a lot during boot when using SHA-512 for module signature checking. Fixing these problems makes it safer to improve loading the rest of the x86 modules like the sha512 module. This series only handles the x86 modules. Except for the tcrypt change, v3 only tackles the hash functions as discussed in https://lore.kernel.org/lkml/MW5PR84MB184284FBED63E2D043C93A6FAB369@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ The limits are implemented as static const unsigned ints at the module level, which makes them easy to expose as module parameters for testing like this: -static const unsigned int bytes_per_fpu = 655 * 1024; +static unsigned int bytes_per_fpu = 655 * 1024; +module_param(bytes_per_fpu, uint, 0644); +MODULE_PARM_DESC(bytes_per_fpu, "Bytes per FPU context"); Robert Elliott (17): crypto: tcrypt - test crc32 crypto: tcrypt - test nhpoly1305 crypto: tcrypt - reschedule during cycles speed tests crypto: x86/sha - limit FPU preemption crypto: x86/crc - limit FPU preemption crypto: x86/sm3 - limit FPU preemption crypto: x86/ghash - use u8 rather than char crypto: x86/ghash - restructure FPU context saving crypto: x86/ghash - limit FPU preemption crypto: x86/*poly* - limit FPU preemption crypto: x86/sha - register all variations crypto: x86/sha - minimize time in FPU context crypto: x86/sha1, sha256 - load based on CPU features crypto: x86/crc - load based on CPU features crypto: x86/sm3 - load based on CPU features crypto: x86/ghash,polyval - load based on CPU features crypto: x86/nhpoly1305, poly1305 - load based on CPU features arch/x86/crypto/crc32-pclmul_asm.S | 6 +- arch/x86/crypto/crc32-pclmul_glue.c | 36 ++- arch/x86/crypto/crc32c-intel_glue.c | 58 +++-- arch/x86/crypto/crct10dif-pclmul_glue.c | 54 ++-- arch/x86/crypto/ghash-clmulni-intel_asm.S | 4 +- arch/x86/crypto/ghash-clmulni-intel_glue.c | 43 ++-- arch/x86/crypto/nhpoly1305-avx2-glue.c | 21 +- arch/x86/crypto/nhpoly1305-sse2-glue.c | 21 +- arch/x86/crypto/poly1305_glue.c | 49 +++- arch/x86/crypto/polyval-clmulni_glue.c | 14 +- arch/x86/crypto/sha1_ssse3_glue.c | 276 +++++++++++++-------- arch/x86/crypto/sha256_ssse3_glue.c | 268 +++++++++++++------- arch/x86/crypto/sha512_ssse3_glue.c | 191 ++++++++------ arch/x86/crypto/sm3_avx_glue.c | 45 +++- crypto/tcrypt.c | 56 +++-- 15 files changed, 764 insertions(+), 378 deletions(-) -- 2.37.3
