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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::332; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x332.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1678188605292100002 This adds a fairly brain dead torture test for TLB flushes intended for stressing the MTTCG QEMU build. It takes the usual -smp option for multiple CPUs. By default it CPU0 will do a TLBIALL flush after each cycle. You can pass options via -append to control additional aspects of the test: - "page" flush each page in turn (one per function) - "self" do the flush after each computation cycle - "verbose" report progress on each computation cycle Signed-off-by: Alex Benn=C3=A9e CC: Mark Rutland Message-Id: <20211118184650.661575-7-alex.bennee@linaro.org> --- v9 - move tests back into unittests.cfg (with nodefault mttcg) - replace printf with report_info - drop accel =3D tcg --- arm/Makefile.common | 1 + arm/tlbflush-code.c | 209 ++++++++++++++++++++++++++++++++++++++++++++ arm/unittests.cfg | 25 ++++++ 3 files changed, 235 insertions(+) create mode 100644 arm/tlbflush-code.c diff --git a/arm/Makefile.common b/arm/Makefile.common index 16f8c6df..2c4aad38 100644 --- a/arm/Makefile.common +++ b/arm/Makefile.common @@ -12,6 +12,7 @@ tests-common +=3D $(TEST_DIR)/gic.flat tests-common +=3D $(TEST_DIR)/psci.flat tests-common +=3D $(TEST_DIR)/sieve.flat tests-common +=3D $(TEST_DIR)/pl031.flat +tests-common +=3D $(TEST_DIR)/tlbflush-code.flat =20 tests-all =3D $(tests-common) $(tests) all: directories $(tests-all) diff --git a/arm/tlbflush-code.c b/arm/tlbflush-code.c new file mode 100644 index 00000000..bf9eb111 --- /dev/null +++ b/arm/tlbflush-code.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * TLB Flush Race Tests + * + * These tests are designed to test for incorrect TLB flush semantics + * under emulation. The initial CPU will set all the others working a + * compuation task and will then trigger TLB flushes across the + * system. It doesn't actually need to re-map anything but the flushes + * themselves will trigger QEMU's TCG self-modifying code detection + * which will invalidate any generated code causing re-translation. + * Eventually the code buffer will fill and a general tb_lush() will + * be triggered. + * + * Copyright (C) 2016-2021, Linaro, Alex Benn=C3=A9e + * + * This work is licensed under the terms of the GNU LGPL, version 2. + */ + +#include +#include +#include +#include +#include + +#define SEQ_LENGTH 10 +#define SEQ_HASH 0x7cd707fe + +static cpumask_t smp_test_complete; +static int flush_count =3D 1000000; +static bool flush_self; +static bool flush_page; +static bool flush_verbose; + +/* + * Work functions + * + * These work functions need to be: + * + * - page aligned, so we can flush one function at a time + * - have branches, so QEMU TCG generates multiple basic blocks + * - call across pages, so we exercise the TCG basic block slow path + */ + +/* Adler32 */ +__attribute__((aligned(PAGE_SIZE))) static +uint32_t hash_array(const void *buf, size_t buflen) +{ + const uint8_t *data =3D (uint8_t *) buf; + uint32_t s1 =3D 1; + uint32_t s2 =3D 0; + + for (size_t n =3D 0; n < buflen; n++) { + s1 =3D (s1 + data[n]) % 65521; + s2 =3D (s2 + s1) % 65521; + } + return (s2 << 16) | s1; +} + +__attribute__((aligned(PAGE_SIZE))) static +void create_fib_sequence(int length, unsigned int *array) +{ + int i; + + /* first two values */ + array[0] =3D 0; + array[1] =3D 1; + for (i =3D 2; i < length; i++) + array[i] =3D array[i-2] + array[i-1]; +} + +__attribute__((aligned(PAGE_SIZE))) static +unsigned long long factorial(unsigned int n) +{ + unsigned int i; + unsigned long long fac =3D 1; + + for (i =3D 1; i <=3D n; i++) + fac =3D fac * i; + return fac; +} + +__attribute__((aligned(PAGE_SIZE))) static +void factorial_array(unsigned int n, unsigned int *input, + unsigned long long *output) +{ + unsigned int i; + + for (i =3D 0; i < n; i++) + output[i] =3D factorial(input[i]); +} + +__attribute__((aligned(PAGE_SIZE))) static +unsigned int do_computation(void) +{ + unsigned int fib_array[SEQ_LENGTH]; + unsigned long long facfib_array[SEQ_LENGTH]; + uint32_t fib_hash, facfib_hash; + + create_fib_sequence(SEQ_LENGTH, &fib_array[0]); + fib_hash =3D hash_array(&fib_array[0], sizeof(fib_array)); + factorial_array(SEQ_LENGTH, &fib_array[0], &facfib_array[0]); + facfib_hash =3D hash_array(&facfib_array[0], sizeof(facfib_array)); + + return (fib_hash ^ facfib_hash); +} + +/* This provides a table of the work functions so we can flush each + * page individually + */ +static void *pages[] =3D {&hash_array, &create_fib_sequence, &factorial, + &factorial_array, &do_computation}; + +static void do_flush(int i) +{ + if (flush_page) + flush_tlb_page((unsigned long)pages[i % ARRAY_SIZE(pages)]); + else + flush_tlb_all(); +} + + +static void just_compute(void) +{ + int i, errors =3D 0; + int cpu =3D smp_processor_id(); + + uint32_t result; + + report_info("CPU%d online", cpu); + + for (i =3D 0 ; i < flush_count; i++) { + result =3D do_computation(); + + if (result !=3D SEQ_HASH) { + errors++; + report_info("CPU%d: seq%d 0x%"PRIx32"!=3D0x%x", + cpu, i, result, SEQ_HASH); + } + + if (flush_verbose && (i % 1000) =3D=3D 0) + report_info("CPU%d: seq%d", cpu, i); + + if (flush_self) + do_flush(i); + } + + report(errors =3D=3D 0, "CPU%d: Done - Errors: %d", cpu, errors); + + cpumask_set_cpu(cpu, &smp_test_complete); + if (cpu !=3D 0) + halt(); +} + +static void just_flush(void) +{ + int cpu =3D smp_processor_id(); + int i =3D 0; + + /* + * Set our CPU as done, keep flushing until everyone else + * finished + */ + cpumask_set_cpu(cpu, &smp_test_complete); + + while (!cpumask_full(&smp_test_complete)) + do_flush(i++); + + report_info("CPU%d: Done - Triggered %d flushes", cpu, i); +} + +int main(int argc, char **argv) +{ + int cpu, i; + char prefix[100]; + + for (i =3D 0; i < argc; i++) { + char *arg =3D argv[i]; + + if (strcmp(arg, "page") =3D=3D 0) + flush_page =3D true; + + if (strcmp(arg, "self") =3D=3D 0) + flush_self =3D true; + + if (strcmp(arg, "verbose") =3D=3D 0) + flush_verbose =3D true; + } + + snprintf(prefix, sizeof(prefix), "tlbflush_%s_%s", + flush_page ? "page" : "all", + flush_self ? "self" : "other"); + report_prefix_push(prefix); + + for_each_present_cpu(cpu) { + if (cpu =3D=3D 0) + continue; + smp_boot_secondary(cpu, just_compute); + } + + if (flush_self) + just_compute(); + else + just_flush(); + + while (!cpumask_full(&smp_test_complete)) + cpu_relax(); + + return report_summary(); +} diff --git a/arm/unittests.cfg b/arm/unittests.cfg index 5e67b558..ee21aef4 100644 --- a/arm/unittests.cfg +++ b/arm/unittests.cfg @@ -275,3 +275,28 @@ file =3D debug.flat arch =3D arm64 extra_params =3D -append 'ss-migration' groups =3D debug migration + +# TLB Torture Tests +[tlbflush-code::all_other] +file =3D tlbflush-code.flat +smp =3D $(($MAX_SMP>4?4:$MAX_SMP)) +groups =3D nodefault mttcg + +[tlbflush-code::page_other] +file =3D tlbflush-code.flat +smp =3D $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params =3D -append 'page' +groups =3D nodefault mttcg + +[tlbflush-code::all_self] +file =3D tlbflush-code.flat +smp =3D $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params =3D -append 'self' +groups =3D nodefault mttcg + +[tlbflush-code::page_self] +file =3D tlbflush-code.flat +smp =3D $(($MAX_SMP>4?4:$MAX_SMP)) +extra_params =3D -append 'page self' +groups =3D nodefault mttcg + --=20 2.39.2