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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f718d426d7
The xor_vmx.c file is used for the RAID5 xor operations. In these functions altivec is enabled to run the operation and then disabled. The code uses enable_kernel_altivec() around the core of the algorithm, however the whole file is built with -maltivec, so the compiler is within its rights to generate altivec code anywhere. This has been seen at least once in the wild: 0:mon> di $xor_altivec_2 c0000000000b97d0 3c4c01d9 addis r2,r12,473 c0000000000b97d4 3842db30 addi r2,r2,-9424 c0000000000b97d8 7c0802a6 mflr r0 c0000000000b97dc f8010010 std r0,16(r1) c0000000000b97e0 60000000 nop c0000000000b97e4 7c0802a6 mflr r0 c0000000000b97e8 faa1ffa8 std r21,-88(r1) ... c0000000000b981c f821ff41 stdu r1,-192(r1) c0000000000b9820 7f8101ce stvx v28,r1,r0 <-- POP c0000000000b9824 38000030 li r0,48 c0000000000b9828 7fa101ce stvx v29,r1,r0 ... c0000000000b984c 4bf6a06d bl c0000000000238b8 # enable_kernel_altivec This patch splits the non-altivec code into xor_vmx_glue.c which calls the altivec functions in xor_vmx.c. By compiling xor_vmx_glue.c without -maltivec we can guarantee that altivec instruction will not be executed outside of the enable/disable block. Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com> [mpe: Rework change log and include disassembly] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
44 lines
1.3 KiB
Makefile
44 lines
1.3 KiB
Makefile
#
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# Makefile for ppc-specific library files..
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#
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subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
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ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
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CFLAGS_REMOVE_code-patching.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_feature-fixups.o = $(CC_FLAGS_FTRACE)
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obj-y += string.o alloc.o code-patching.o feature-fixups.o
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obj-$(CONFIG_PPC32) += div64.o copy_32.o crtsavres.o
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# See corresponding test in arch/powerpc/Makefile
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# 64-bit linker creates .sfpr on demand for final link (vmlinux),
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# so it is only needed for modules, and only for older linkers which
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# do not support --save-restore-funcs
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ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
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extra-$(CONFIG_PPC64) += crtsavres.o
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endif
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obj64-y += copypage_64.o copyuser_64.o mem_64.o hweight_64.o \
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copyuser_power7.o string_64.o copypage_power7.o memcpy_power7.o \
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memcpy_64.o memcmp_64.o
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obj64-$(CONFIG_SMP) += locks.o
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obj64-$(CONFIG_ALTIVEC) += vmx-helper.o
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obj64-$(CONFIG_KPROBES_SANITY_TEST) += test_emulate_step.o
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obj-y += checksum_$(BITS).o checksum_wrappers.o
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obj-$(CONFIG_PPC_EMULATE_SSTEP) += sstep.o ldstfp.o
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obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
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obj-$(CONFIG_FTR_FIXUP_SELFTEST) += feature-fixups-test.o
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obj-$(CONFIG_ALTIVEC) += xor_vmx.o xor_vmx_glue.o
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CFLAGS_xor_vmx.o += -maltivec $(call cc-option,-mabi=altivec)
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obj-$(CONFIG_PPC64) += $(obj64-y)
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