August 2024 - Linux-kselftest-mirror

[bug report] selftests/bpf: Add C tests for reference tracking

by Dan Carpenter

Hello Joe Stringer, Commit de375f4e91e3 ("selftests/bpf: Add C tests for reference tracking") from Oct 2, 2018 (linux-next), leads to the following Smatch static checker warning: ./tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c:70 sk_lookup_success() warn: potential pointer math issue ('tuple' is a 288 bit pointer) ./tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c 55 SEC("?tc") 56 int sk_lookup_success(struct __sk_buff *skb) 57 { 58 void *data_end = (void *)(long)skb->data_end; 59 void *data = (void *)(long)skb->data; 60 struct ethhdr *eth = (struct ethhdr *)(data); 61 struct bpf_sock_tuple *tuple; 62 struct bpf_sock *sk; 63 size_t tuple_len; 64 bool ipv4; 65 66 if (eth + 1 > data_end) 67 return TC_ACT_SHOT; 68 69 tuple = get_tuple(data, sizeof(*eth), data_end, eth->h_proto, &ipv4); --> 70 if (!tuple || tuple + sizeof *tuple > data_end) ^^^^^^^^^^^^^^^^^^^^^ This is pointer math. It should be "tuple + 1" or (u8 *)tuple + sizeof(*tuple). 71 return TC_ACT_SHOT; 72 73 tuple_len = ipv4 ? sizeof(tuple->ipv4) : sizeof(tuple->ipv6); 74 sk = bpf_sk_lookup_tcp(skb, tuple, tuple_len, BPF_F_CURRENT_NETNS, 0); 75 bpf_printk("sk=%d\n", sk ? 1 : 0); 76 if (sk) 77 bpf_sk_release(sk); 78 return sk ? TC_ACT_OK : TC_ACT_UNSPEC; 79 } regards, dan carpenter

4 months, 1 week

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[bug report] selftests/bpf: Factor out get_xlated_program() helper

by Dan Carpenter

Hello Hou Tao, This is a semi-automatic email about new static checker warnings. Commit b4b7a4099b8c ("selftests/bpf: Factor out get_xlated_program() helper") from Jan 5, 2024, leads to the following Smatch complaint: ./tools/testing/selftests/bpf/testing_helpers.c:455 get_xlated_program() warn: variable dereferenced before check 'buf' (see line 454) ./tools/testing/selftests/bpf/testing_helpers.c 453 *cnt = xlated_prog_len / buf_element_size; 454 *buf = calloc(*cnt, buf_element_size); 455 if (!buf) { ^^^ This should be *buf. 456 perror("can't allocate xlated program buffer"); 457 return -ENOMEM; regards, dan carpenter

4 months, 1 week

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[PATCH v1 00/16] iommufd: Add VIOMMU infrastructure (Part-1)

by Nicolin Chen

This series introduces a new VIOMMU infrastructure and related ioctls. IOMMUFD has been using the HWPT infrastructure for all cases, including a nested IO page table support. Yet, there're limitations for an HWPT-based structure to support some advanced HW-accelerated features, such as CMDQV on NVIDIA Grace, and HW-accelerated vIOMMU on AMD. Even for a multi-IOMMU environment, it is not straightforward for nested HWPTs to share the same parent HWPT (stage-2 IO pagetable), with the HWPT infrastructure alone. The new VIOMMU object is an additional layer, between the nested HWPT and its parent HWPT, to give to both the IOMMUFD core and an IOMMU driver an additional structure to support HW-accelerated feature: ---------------------------- ---------------- | | paging_hwpt0 | | hwpt_nested0 |--->| viommu0 ------------------ ---------------- | | HW-accel feats | ---------------------------- On a multi-IOMMU system, the VIOMMU object can be instanced to the number of vIOMMUs in a guest VM, while holding the same parent HWPT to share the stage-2 IO pagetable. Each VIOMMU then just need to only allocate its own VMID to attach the shared stage-2 IO pagetable to the physical IOMMU: ---------------------------- ---------------- | | paging_hwpt0 | | hwpt_nested0 |--->| viommu0 ------------------ ---------------- | | VMID0 | ---------------------------- ---------------------------- ---------------- | | paging_hwpt0 | | hwpt_nested1 |--->| viommu1 ------------------ ---------------- | | VMID1 | ---------------------------- As an initial part-1, add ioctls to support a VIOMMU-based invalidation: IOMMUFD_CMD_VIOMMU_ALLOC to allocate a VIOMMU object IOMMUFD_CMD_VIOMMU_SET/UNSET_VDEV_ID to set/clear device's virtual ID IOMMUFD_CMD_VIOMMU_INVALIDATE to flush cache by a given driver data Worth noting that the VDEV_ID is for a per-VIOMMU device list for drivers to look up the device's physical instance from its virtual ID in a VM. It is essential for a VIOMMU-based invalidation where the request contains a device's virtual ID for its device cache flush, e.g. ATC invalidation. As for the implementation of the series, add an IOMMU_VIOMMU_TYPE_DEFAULT type for a core-allocated-core-managed VIOMMU object, allowing drivers to simply hook a default viommu ops for viommu-based invalidation alone. And provide some viommu helpers to drivers for VDEV_ID translation and parent domain lookup. Introduce an IOMMU_VIOMMU_INVALIDATE_DATA_ARM_SMMUV3 for a real world use case. This adds supports of arm-smmuv-v3's CMDQ_OP_ATC_INV and CMDQ_OP_CFGI_CD/ALL commands, supplementing HWPT-based invalidations. In the future, drivers will also be able to choose a driver-managed type to hold its own structure by adding a new type to enum iommu_viommu_type. More VIOMMU-based structures and ioctls will be introduced in part-2/3 to support a driver-managed VIOMMU, e.g. VQUEUE object for a HW accelerated queue, VIRQ (or VEVENT) object for IRQ injections. Although we repurposed the VIOMMU object from an earlier RFC discussion, for a referece: https://lore.kernel.org/all/cover.1712978212.git.nicolinc@nvidia.com/ This series is on Github: https://github.com/nicolinc/iommufd/commits/iommufd_viommu_p1-v1 Thanks! Nicolin Jason Gunthorpe (1): iommu/arm-smmu-v3: Allow ATS for IOMMU_DOMAIN_NESTED Nicolin Chen (15): iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU_ALLOC ioctl iommu: Pass in a viommu pointer to domain_alloc_user op iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT_ALLOC iommufd/selftest: Add IOMMU_VIOMMU_ALLOC test coverage iommufd/viommu: Add IOMMU_VIOMMU_SET/UNSET_VDEV_ID ioctl iommufd/selftest: Add IOMMU_VIOMMU_SET/UNSET_VDEV_ID test coverage iommufd/viommu: Add cache_invalidate for IOMMU_VIOMMU_TYPE_DEFAULT iommufd/viommu: Add IOMMU_VIOMMU_INVALIDATE ioctl iommufd/viommu: Make iommufd_viommu_find_device a public API iommufd/selftest: Add mock_viommu_invalidate_user op iommufd/selftest: Add IOMMU_TEST_OP_DEV_CHECK_CACHE test command iommufd/selftest: Add coverage for IOMMU_VIOMMU_INVALIDATE ioctl iommufd/viommu: Add iommufd_viommu_to_parent_domain helper iommu/arm-smmu-v3: Extract an __arm_smmu_cache_invalidate_user helper iommu/arm-smmu-v3: Add viommu cache invalidation support drivers/iommu/amd/iommu.c | 1 + drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 90 +++++- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 + drivers/iommu/intel/iommu.c | 1 + drivers/iommu/iommufd/Makefile | 3 +- drivers/iommu/iommufd/device.c | 9 + drivers/iommu/iommufd/hw_pagetable.c | 27 +- drivers/iommu/iommufd/iommufd_private.h | 37 +++ drivers/iommu/iommufd/iommufd_test.h | 30 ++ drivers/iommu/iommufd/main.c | 15 + drivers/iommu/iommufd/selftest.c | 88 +++++- drivers/iommu/iommufd/viommu.c | 249 +++++++++++++++++ include/linux/iommu.h | 6 + include/linux/iommufd.h | 35 +++ include/uapi/linux/iommufd.h | 139 ++++++++- tools/testing/selftests/iommu/iommufd.c | 263 +++++++++++++++++- tools/testing/selftests/iommu/iommufd_utils.h | 126 +++++++++ 17 files changed, 1095 insertions(+), 26 deletions(-) create mode 100644 drivers/iommu/iommufd/viommu.c -- 2.43.0

4 months, 1 week

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[PATCH] kselftest: timers: Fix const correctness

by Piotr Zalewski

Make timespec pointers, pointers to const in checklist function. As a consequence, make list parameter in checklist function pointer to const as well. Const-correctness increases readability. Improvement was found by running cppcheck tool on the patched file as follows: ``` cppcheck --enable=all \ tools/testing/selftests/timers/threadtest.c \ --suppress=missingIncludeSystem \ --suppress=unusedFunction ``` Reviewed-by: Shuah Khan <skhan(a)linuxfoundation.org> Signed-off-by: Piotr Zalewski <pZ010001011111(a)proton.me> --- tools/testing/selftests/timers/threadtest.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/timers/threadtest.c b/tools/testing/selftests/timers/threadtest.c index 76b38e41d9c7..d5564bbf0e50 100644 --- a/tools/testing/selftests/timers/threadtest.c +++ b/tools/testing/selftests/timers/threadtest.c @@ -38,10 +38,10 @@ struct timespec global_list[LISTSIZE]; int listcount = 0; -void checklist(struct timespec *list, int size) +void checklist(const struct timespec *list, int size) { int i, j; - struct timespec *a, *b; + const struct timespec *a, *b; /* scan the list */ for (i = 0; i < size-1; i++) { -- 2.46.0

4 months, 1 week

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[PATCH v1 0/5] KVM: s390: selftests: Add regression tests for CPU subfunctions

by Hariharan Mari

This patch series introduces a set of regression tests for various s390x CPU subfunctions in KVM. The tests ensure that the KVM implementation accurately reflects the behavior of actual CPU instructions for these subfunctions. The series adds tests for a total of 15 instructions across five patches, covering a range of operations including sorting, compression, and various cryptographic functions. Each patch follows a consistent testing pattern: 1. Obtain the KVM_S390_VM_CPU_MACHINE_SUBFUNC attribute for the VM. 2. Execute the relevant asm instructions. 3. Compare KVM-reported results with direct instruction execution results. Testing has been performed on s390x hardware with KVM support. All tests pass successfully, verifying the correct implementation of these subfunctions in KVM. Hariharan Mari (5): KVM: s390: selftests: Add regression tests for SORTL and DFLTCC CPU subfunctions KVM: s390: selftests: Add regression tests for PRNO, KDSA and KMA crypto subfunctions KVM: s390: selftests: Add regression tests for KMCTR, KMF, KMO and PCC crypto subfunctions KVM: s390: selftests: Add regression tests for KMAC, KMC, KM, KIMD and KLMD crypto subfunctions KVM: s390: selftests: Add regression tests for PLO subfunctions tools/testing/selftests/kvm/Makefile | 1 + .../selftests/kvm/include/s390x/facility.h | 50 +++ .../kvm/s390x/cpumodel_subfuncs_test.c | 343 ++++++++++++++++++ 3 files changed, 394 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/s390x/facility.h create mode 100644 tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c -- 2.45.2

4 months, 1 week

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[RFC PATCH 5/5] selftests/rseq: Implement NUMA node id vs mm_cid invariant test

by Mathieu Desnoyers

This test validates that the mapping between a mm_cid and a NUMA node id remains invariant for the process lifetime for a process with a number of threads >= number of allowed CPUs. In other words, it validates that if any thread within the process running on behalf of a mm_cid N observes a NUMA node id M, all threads within this process will always observe the same NUMA node id value when running on behalf of that same mm_cid. This characteristic is important for NUMA locality. On all architectures except Power, the NUMA topology is never reconfigured after a CPU has been associated with a NUMA node in the system lifetime. Even on Power, we can assume that NUMA topology reconfiguration happens rarely, and therefore we do not expect it to happen while the NUMA test is running. As a result the NUMA node id associated with a mm_cid should be invariant as long as: - A process has a number of threads >= number of allowed CPUs, - The allowed CPUs mask is unchanged, and - The NUMA configuration is unchanged. This test is skipped on architectures that do not implement rseq_load_u32_u32. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Shuah Khan <skhan(a)linuxfoundation.org> Cc: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/rseq/.gitignore | 1 + tools/testing/selftests/rseq/Makefile | 2 +- .../testing/selftests/rseq/basic_numa_test.c | 144 ++++++++++++++++++ 3 files changed, 146 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/rseq/basic_numa_test.c diff --git a/tools/testing/selftests/rseq/.gitignore b/tools/testing/selftests/rseq/.gitignore index 16496de5f6ce..8a8d163cbb9f 100644 --- a/tools/testing/selftests/rseq/.gitignore +++ b/tools/testing/selftests/rseq/.gitignore @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only +basic_numa_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test basic_test diff --git a/tools/testing/selftests/rseq/Makefile b/tools/testing/selftests/rseq/Makefile index 5a3432fceb58..9ef1c949114a 100644 --- a/tools/testing/selftests/rseq/Makefile +++ b/tools/testing/selftests/rseq/Makefile @@ -14,7 +14,7 @@ LDLIBS += -lpthread -ldl # still track changes to header files and depend on shared object. OVERRIDE_TARGETS = 1 -TEST_GEN_PROGS = basic_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test param_test \ +TEST_GEN_PROGS = basic_test basic_numa_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test param_test \ param_test_benchmark param_test_compare_twice param_test_mm_cid \ param_test_mm_cid_benchmark param_test_mm_cid_compare_twice diff --git a/tools/testing/selftests/rseq/basic_numa_test.c b/tools/testing/selftests/rseq/basic_numa_test.c new file mode 100644 index 000000000000..8e51c662057d --- /dev/null +++ b/tools/testing/selftests/rseq/basic_numa_test.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * Basic rseq NUMA test. Validate that (mm_cid, numa_node_id) pairs are + * invariant when the number of threads >= number of allowed CPUs, as + * long as those preconditions are respected: + * + * - A process has a number of threads >= number of allowed CPUs, + * - The allowed CPUs mask is unchanged, and + * - The NUMA configuration is unchanged. + */ +#define _GNU_SOURCE +#include <assert.h> +#include <sched.h> +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <poll.h> +#include <sys/time.h> + +#include "rseq.h" + +#define NR_LOOPS 100 + +static int nr_threads, nr_active_threads, test_go, test_stop; + +#ifdef RSEQ_ARCH_HAS_LOAD_U32_U32 + +static int cpu_numa_id[CPU_SETSIZE]; + +static int get_affinity_weight(void) +{ + cpu_set_t allowed_cpus; + + if (sched_getaffinity(0, sizeof(allowed_cpus), &allowed_cpus)) { + perror("sched_getaffinity"); + abort(); + } + return CPU_COUNT(&allowed_cpus); +} + +static void numa_id_init(void) +{ + int i; + + for (i = 0; i < CPU_SETSIZE; i++) + cpu_numa_id[i] = -1; +} + +static void *test_thread(void *arg) +{ + int i; + + if (rseq_register_current_thread()) { + fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + abort(); + } + /* + * Rendez-vous across all threads to make sure the number of + * threads >= number of possible CPUs for the entire test duration. + */ + if (__atomic_add_fetch(&nr_active_threads, 1, __ATOMIC_RELAXED) == nr_threads) + __atomic_store_n(&test_go, 1, __ATOMIC_RELAXED); + while (!__atomic_load_n(&test_go, __ATOMIC_RELAXED)) + rseq_barrier(); + + for (i = 0; i < NR_LOOPS; i++) { + uint32_t mm_cid, node; + int cached_node_id; + + while (rseq_load_u32_u32(RSEQ_MO_RELAXED, &mm_cid, + &rseq_get_abi()->mm_cid, + &node, &rseq_get_abi()->node_id) != 0) { + /* Retry. */ + } + cached_node_id = RSEQ_READ_ONCE(cpu_numa_id[mm_cid]); + if (cached_node_id == -1) { + RSEQ_WRITE_ONCE(cpu_numa_id[mm_cid], node); + } else { + if (node != cached_node_id) { + fprintf(stderr, "Error: NUMA node id discrepancy: mm_cid %u cached node id %d node id %u.\n", + mm_cid, cached_node_id, node); + fprintf(stderr, "This is likely a kernel bug, or caused by a concurrent NUMA topology reconfiguration.\n"); + abort(); + } + } + (void) poll(NULL, 0, 10); /* wait 10ms */ + } + /* + * Rendez-vous before exiting all threads to make sure the + * number of threads >= number of possible CPUs for the entire + * test duration. + */ + if (__atomic_sub_fetch(&nr_active_threads, 1, __ATOMIC_RELAXED) == 0) + __atomic_store_n(&test_stop, 1, __ATOMIC_RELAXED); + while (!__atomic_load_n(&test_stop, __ATOMIC_RELAXED)) + rseq_barrier(); + + if (rseq_unregister_current_thread()) { + fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + abort(); + } + return NULL; +} + +static int test_numa(void) +{ + pthread_t tid[nr_threads]; + int err, i; + void *tret; + + numa_id_init(); + + printf("testing rseq (mm_cid, numa_node_id) invariant, multi-threaded (%d threads)\n", + nr_threads); + + for (i = 0; i < nr_threads; i++) { + err = pthread_create(&tid[i], NULL, test_thread, NULL); + if (err != 0) + abort(); + } + + for (i = 0; i < nr_threads; i++) { + err = pthread_join(tid[i], &tret); + if (err != 0) + abort(); + } + + return 0; +} +#else +static int test_numa(void) +{ + fprintf(stderr, "rseq_load_u32_u32 is not implemented on this architecture. Skipping numa test.\n"); + return 0; +} +#endif + +int main(int argc, char **argv) +{ + nr_threads = get_affinity_weight(); + return test_numa(); +} -- 2.39.2

4 months, 1 week

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[RFC PATCH 4/5] selftests/rseq: x86: Implement rseq_load_u32_u32

by Mathieu Desnoyers

Allow loading a pair of u32 within a rseq critical section. It can be used in situations where both rseq_abi()->mm_cid and rseq_abi()->node_id need to be sampled atomically with respect to preemption, signal delivery and migration. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Ingo Molnar <mingo(a)redhat.com> Cc: Shuah Khan <skhan(a)linuxfoundation.org> Cc: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/rseq/rseq-x86-bits.h | 43 ++++++++++++++++++++ tools/testing/selftests/rseq/rseq.h | 14 +++++++ 2 files changed, 57 insertions(+) diff --git a/tools/testing/selftests/rseq/rseq-x86-bits.h b/tools/testing/selftests/rseq/rseq-x86-bits.h index 8a9431eec467..fdf5ef398393 100644 --- a/tools/testing/selftests/rseq/rseq-x86-bits.h +++ b/tools/testing/selftests/rseq/rseq-x86-bits.h @@ -990,4 +990,47 @@ int RSEQ_TEMPLATE_IDENTIFIER(rseq_cmpeqv_trymemcpy_storev)(intptr_t *v, intptr_t #endif +#if defined(RSEQ_TEMPLATE_CPU_ID_NONE) && defined(RSEQ_TEMPLATE_MO_RELAXED) + +#define RSEQ_ARCH_HAS_LOAD_U32_U32 + +static inline __attribute__((always_inline)) +int RSEQ_TEMPLATE_IDENTIFIER(rseq_load_u32_u32)(uint32_t *dst1, uint32_t *src1, + uint32_t *dst2, uint32_t *src2) +{ + RSEQ_INJECT_C(9) + + __asm__ __volatile__ goto ( + RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */ + /* Start rseq by storing table entry pointer into rseq_cs. */ + RSEQ_ASM_STORE_RSEQ_CS(1, 3b, RSEQ_ASM_TP_SEGMENT:RSEQ_CS_OFFSET(%[rseq_offset])) + RSEQ_INJECT_ASM(3) + "movl %[src1], %%eax\n\t" + "movl %%eax, %[dst1]\n\t" + "movl %[src2], %%eax\n\t" + "movl %%eax, %[dst2]\n\t" + "2:\n\t" + RSEQ_INJECT_ASM(4) + RSEQ_ASM_DEFINE_ABORT(4, "", abort) + : /* gcc asm goto does not allow outputs */ + : [rseq_offset] "r" (rseq_offset), + /* final store input */ + [dst1] "m" (*dst1), + [src1] "m" (*src1), + [dst2] "m" (*dst2), + [src2] "m" (*src2) + : "memory", "cc", "rax" + RSEQ_INJECT_CLOBBER + : abort + ); + rseq_after_asm_goto(); + return 0; +abort: + rseq_after_asm_goto(); + RSEQ_INJECT_FAILED + return -1; +} + +#endif /* defined(RSEQ_TEMPLATE_CPU_ID_NONE) && defined(RSEQ_TEMPLATE_MO_RELAXED) */ + #include "rseq-bits-reset.h" diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h index d7364ea4d201..b6095c2a5da6 100644 --- a/tools/testing/selftests/rseq/rseq.h +++ b/tools/testing/selftests/rseq/rseq.h @@ -381,4 +381,18 @@ int rseq_cmpeqv_trymemcpy_storev(enum rseq_mo rseq_mo, enum rseq_percpu_mode per } } +#ifdef RSEQ_ARCH_HAS_LOAD_U32_U32 + +static inline __attribute__((always_inline)) +int rseq_load_u32_u32(enum rseq_mo rseq_mo, + uint32_t *dst1, uint32_t *src1, + uint32_t *dst2, uint32_t *src2) +{ + if (rseq_mo != RSEQ_MO_RELAXED) + return -1; + return rseq_load_u32_u32_relaxed(dst1, src1, dst2, src2); +} + +#endif + #endif /* RSEQ_H_ */ -- 2.39.2

4 months, 1 week

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[PATCH v2] lib/math: Add int_pow test suite

by Luis Felipe Hernandez

Adds test suite for integer based power function. Signed-off-by: Luis Felipe Hernandez <luis.hernandez093(a)gmail.com> --- lib/Kconfig.debug | 9 ++++++ lib/math/Makefile | 1 + lib/math/tests/Makefile | 3 ++ lib/math/tests/int_pow_kunit.c | 52 ++++++++++++++++++++++++++++++++++ 4 files changed, 65 insertions(+) create mode 100644 lib/math/tests/Makefile create mode 100644 lib/math/tests/int_pow_kunit.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index a30c03a66172..b0bbd30d4cba 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -3051,3 +3051,12 @@ config RUST_KERNEL_DOCTESTS endmenu # "Rust" endmenu # Kernel hacking + +config INT_POW_TEST + tristate "Integer exponentiation (int_pow) test" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + Enable this to test the int_pow maths function KUnit test. + + If unsure, say N diff --git a/lib/math/Makefile b/lib/math/Makefile index 91fcdb0c9efe..3c1f92a7459d 100644 --- a/lib/math/Makefile +++ b/lib/math/Makefile @@ -5,5 +5,6 @@ obj-$(CONFIG_CORDIC) += cordic.o obj-$(CONFIG_PRIME_NUMBERS) += prime_numbers.o obj-$(CONFIG_RATIONAL) += rational.o +obj-$(CONFIG_INT_POW_TEST) += tests/int_pow_kunit.o obj-$(CONFIG_TEST_DIV64) += test_div64.o obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational-test.o diff --git a/lib/math/tests/Makefile b/lib/math/tests/Makefile new file mode 100644 index 000000000000..6a169123320a --- /dev/null +++ b/lib/math/tests/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only + +obj-$(CONFIG_INT_POW_TEST) += int_pow_kunit.o diff --git a/lib/math/tests/int_pow_kunit.c b/lib/math/tests/int_pow_kunit.c new file mode 100644 index 000000000000..e04dd73dabd1 --- /dev/null +++ b/lib/math/tests/int_pow_kunit.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <kunit/test.h> +#include <linux/math.h> + +struct test_case_params { + u64 base; + unsigned int exponent; + u64 expected_result; + const char *name; +}; + +static const struct test_case_params params[] = { + { 64, 0, 1, "Power of zero" }, + { 64, 1, 64, "Power of one"}, + { 0, 5, 0, "Base zero" }, + { 1, 64, 1, "Base one" }, + { 2, 2, 4, "Two squared"}, + { 2, 3, 8, "Two cubed"}, + { 5, 5, 3125, "Five raised to the fith power" }, + { U64_MAX, 1, U64_MAX, "Max base" }, + { 2, 63, 9223372036854775808, "Large result"}, +}; + +static void get_desc(const struct test_case_params *tc, char *desc) +{ + strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE); +} + +KUNIT_ARRAY_PARAM(int_pow, params, get_desc); + +static void int_pow_test(struct kunit *test) +{ + const struct test_case_params *tc = (const struct test_case_params *)test->param_value; + + KUNIT_EXPECT_EQ(test, tc->expected_result, int_pow(tc->base, tc->exponent)); +} + +static struct kunit_case math_int_pow_test_cases[] = { + KUNIT_CASE_PARAM(int_pow_test, int_pow_gen_params), + {} +}; + +static struct kunit_suite int_pow_test_suite = { + .name = "math-int_pow", + .test_cases = math_int_pow_test_cases, +}; + +kunit_test_suites(&int_pow_test_suite); + +MODULE_DESCRIPTION("math.int_pow KUnit test suite"); +MODULE_LICENSE("GPL"); -- 2.46.0

4 months, 1 week

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[PATCHv2 net 0/2] selftests: Fix udpgro failures

by Hangbin Liu

There are 2 issues for the current udpgro test. The first one is the testing doesn't record all the failures, which may report pass but the test actually failed. e.g. https://netdev-3.bots.linux.dev/vmksft-net/results/725661/45-udpgro-sh/stdo… The other one is after commit d7db7775ea2e ("net: veth: do not manipulate GRO when using XDP"), there is no need to load xdp program to enable GRO on veth device. Hangbin Liu (2): selftests: udpgro: report error when receive failed selftests: udpgro: no need to load xdp for gro tools/testing/selftests/net/udpgro.sh | 53 ++++++++++++++------------- 1 file changed, 28 insertions(+), 25 deletions(-) -- 2.45.0

4 months, 1 week

2
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[PATCH v4 0/3] tracing: Support poll on event hist file

by Masami Hiramatsu (Google)

Hi, Here is the v4 patch to support polling on event 'hist' file. The previous version is here; https://lore.kernel.org/all/172359427367.323666.6446548762874507863.stgit@d… This version uses getopt() in poll test command in [3/3] according to Shuah's comment in the previous thread. Background ---------- There has been interest in allowing user programs to monitor kernel events in real time. Ftrace provides `trace_pipe` interface to wait on events in the ring buffer, but it is needed to wait until filling up a page with events in the ring buffer. We can also peek the `trace` file periodically, but that is inefficient way to monitor a randomely happening event. Overview -------- This patch set allows user to `poll`(or `select`, `epoll`) on event histogram interface. As you know each event has its own `hist` file which shows histograms generated by trigger action. So user can set a new hist trigger on any event you want to monitor, and poll on the `hist` file until it is updated. There are 2 poll events are supported, POLLIN and POLLPRI. POLLIN means that there are any readable update on `hist` file and this event will be flashed only when you call read(). So, this is useful if you want to read the histogram periodically. The other POLLPRI event is for monitoring trace event. Like the POLLIN, this will be returned when the histogram is updated, but you don't need to read() the file and use poll() again. Note that this waits for histogram update (not event arrival), thus you must set a histogram on the event at first. Usage ----- Here is an example usage: ---- TRACEFS=/sys/kernel/tracing EVENT=$TRACEFS/events/sched/sched_process_free # setup histogram trigger and enable event echo "hist:key=comm" >> $EVENT/trigger echo 1 > $EVENT/enable # Wait for update poll pri $EVENT/hist # Event arrived. echo "process free event is comming" tail $TRACEFS/trace ---- The 'poll' command is in the selftest patch. You can take this series also from here; https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/log/?h=t… Thank you, --- Masami Hiramatsu (Google) (3): tracing/hist: Add poll(POLLIN) support on hist file tracing/hist: Support POLLPRI event for poll on histogram selftests/tracing: Add hist poll() support test include/linux/trace_events.h | 5 + kernel/trace/trace_events.c | 18 ++++ kernel/trace/trace_events_hist.c | 101 +++++++++++++++++++- tools/testing/selftests/ftrace/Makefile | 2 tools/testing/selftests/ftrace/poll.c | 74 +++++++++++++++ .../ftrace/test.d/trigger/trigger-hist-poll.tc | 74 +++++++++++++++ 6 files changed, 271 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/ftrace/poll.c create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc -- Masami Hiramatsu (Google) <mhiramat(a)kernel.org>

4 months, 1 week

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Linux-kselftest-mirror August 2024