/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * Original: Michael Neuling 19/7/2013 * Edited: Rashmica Gupta 01/12/2015 * * Do some transactions, see if the tar is corrupted. * If the transaction is aborted, the TAR should be rolled back to the * checkpointed value before the transaction began. The value written to * TAR in suspended mode should only remain in TAR if the transaction * completes. */ #include #include #include #include #include "tm.h" #include "utils.h" int num_loops = 10000; int test_tar(void) { int i; SKIP_IF(!have_htm()); for (i = 0; i < num_loops; i++) { uint64_t result = 0; asm __volatile__( "li 7, 1;" "mtspr %[tar], 7;" /* tar = 1 */ "tbegin.;" "beq 3f;" "li 4, 0x7000;" /* Loop lots, to use time */ "2:;" /* Start loop */ "li 7, 2;" "mtspr %[tar], 7;" /* tar = 2 */ "tsuspend.;" "li 7, 3;" "mtspr %[tar], 7;" /* tar = 3 */ "tresume.;" "subi 4, 4, 1;" "cmpdi 4, 0;" "bne 2b;" "tend.;" /* Transaction sucess! TAR should be 3 */ "mfspr 7, %[tar];" "ori %[res], 7, 4;" // res = 3|4 = 7 "b 4f;" /* Abort handler. TAR should be rolled back to 1 */ "3:;" "mfspr 7, %[tar];" "ori %[res], 7, 8;" // res = 1|8 = 9 "4:;" : [res]"=r"(result) : [tar]"i"(SPRN_TAR) : "memory", "r0", "r4", "r7"); /* If result is anything else other than 7 or 9, the tar * value must have been corrupted. */ if ((result != 7) && (result != 9)) return 1; } return 0; } int main(int argc, char *argv[]) { /* A low number of iterations (eg 100) can cause a false pass */ if (argc > 1) { if (strcmp(argv[1], "-h") == 0) { printf("Syntax:\n\t%s []\n", argv[0]); return 1; } else { num_loops = atoi(argv[1]); } } printf("Starting, %d loops\n", num_loops); return test_harness(test_tar, "tm_tar"); } s-private-remove&id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>treecommitdiff
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /sound/soc/sirf/sirf-usp.c
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/soc/sirf/sirf-usp.c')