linux-kernel - Re: [PATCH v6 24/24] KVM: riscv: selftests: Add commandline option for SBI PMU test

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Message-ID: <20240415-8b9ad5a7e968b1808e99e3da@orel>
Date: Mon, 15 Apr 2024 15:43:52 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Atish Patra <atishp@...osinc.com>
Cc: linux-kernel@...r.kernel.org, Ajay Kaher <ajay.kaher@...adcom.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alexghiti@...osinc.com>, 
	Alexey Makhalov <alexey.amakhalov@...adcom.com>, Anup Patel <anup@...infault.org>, 
	Atish Patra <atishp@...shpatra.org>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Conor Dooley <conor.dooley@...rochip.com>, 
	Juergen Gross <jgross@...e.com>, kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Mark Rutland <mark.rutland@....com>, Palmer Dabbelt <palmer@...belt.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Shuah Khan <shuah@...nel.org>, virtualization@...ts.linux.dev, Will Deacon <will@...nel.org>, 
	x86@...nel.org
Subject: Re: [PATCH v6 24/24] KVM: riscv: selftests: Add commandline option
 for SBI PMU test

On Wed, Apr 10, 2024 at 05:07:52PM -0700, Atish Patra wrote:
> SBI PMU test comprises of multiple tests and user may want to run
> only a subset depending on the platform. The most common case would
> be to run all to validate all the tests. However, some platform may
> not support all events or all ISA extensions.
> 
> The commandline option allows user to disable particular test if they
> want to.
> 
> Suggested-by: Andrew Jones <ajones@...tanamicro.com>
> Signed-off-by: Atish Patra <atishp@...osinc.com>
> ---
>  .../selftests/kvm/riscv/sbi_pmu_test.c        | 77 ++++++++++++++++---
>  1 file changed, 68 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c b/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> index 0fd9b76ae838..57025b07a403 100644
> --- a/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> +++ b/tools/testing/selftests/kvm/riscv/sbi_pmu_test.c
> @@ -33,6 +33,16 @@ static unsigned long counter_mask_available;
>  
>  static bool illegal_handler_invoked;
>  
> +enum sbi_pmu_test_id {
> +	SBI_PMU_TEST_BASIC = 0,
> +	SBI_PMU_TEST_EVENTS,
> +	SBI_PMU_TEST_SNAPSHOT,
> +	SBI_PMU_TEST_OVERFLOW,
> +	SBI_PMU_TEST_MAX,
> +};
> +
> +static int disabled_test_id = SBI_PMU_TEST_MAX;

I think we should allow specifying '-d' multiple times in case a user
wants to disable more than one type of test. So we should set a bit
in this variable instead of assigning it. We could also flip it
around. If the user uses '-e' to enable test type then only type
will be run, but then we'd probably want to allow multiple '-e'
too so it doesn't gain anything.

> +
>  unsigned long pmu_csr_read_num(int csr_num)
>  {
>  #define switchcase_csr_read(__csr_num, __val)		{\
> @@ -608,19 +618,68 @@ static void test_vm_events_overflow(void *guest_code)
>  	test_vm_destroy(vm);
>  }
>  
> -int main(void)
> +static void test_print_help(char *name)
>  {
> -	test_vm_basic_test(test_pmu_basic_sanity);
> -	pr_info("SBI PMU basic test : PASS\n");
> +	pr_info("Usage: %s [-h] [-d <test name>]\n", name);
> +	pr_info("\t-d: Test to disable. Available tests are 'basic', 'events', 'snapshot', 'overflow'\n");
> +	pr_info("\t-h: print this help screen\n");
> +}
>  
> -	test_vm_events_test(test_pmu_events);
> -	pr_info("SBI PMU event verification test : PASS\n");
> +static bool parse_args(int argc, char *argv[])
> +{
> +	int opt;
> +
> +	while ((opt = getopt(argc, argv, "hd:")) != -1) {
> +		switch (opt) {
> +		case 'd':
> +			if (!strncmp("basic", optarg, 5))
> +				disabled_test_id = SBI_PMU_TEST_BASIC;
> +			else if (!strncmp("events", optarg, 6))
> +				disabled_test_id = SBI_PMU_TEST_EVENTS;
> +			else if (!strncmp("snapshot", optarg, 8))
> +				disabled_test_id = SBI_PMU_TEST_SNAPSHOT;
> +			else if (!strncmp("overflow", optarg, 8))
> +				disabled_test_id = SBI_PMU_TEST_OVERFLOW;
> +			else
> +				goto done;
> +			break;
> +		break;

Extra 'break'

> +		case 'h':
> +		default:
> +			goto done;
> +		}
> +	}
>  
> -	test_vm_events_snapshot_test(test_pmu_events_snaphost);
> -	pr_info("SBI PMU event verification with snapshot test : PASS\n");
> +	return true;
> +done:
> +	test_print_help(argv[0]);
> +	return false;
> +}
>  
> -	test_vm_events_overflow(test_pmu_events_overflow);
> -	pr_info("SBI PMU event verification with overflow test : PASS\n");
> +int main(int argc, char *argv[])
> +{
> +	if (!parse_args(argc, argv))
> +		exit(KSFT_SKIP);
> +
> +	if (disabled_test_id != SBI_PMU_TEST_BASIC) {
> +		test_vm_basic_test(test_pmu_basic_sanity);
> +		pr_info("SBI PMU basic test : PASS\n");
> +	}
> +
> +	if (disabled_test_id != SBI_PMU_TEST_EVENTS) {
> +		test_vm_events_test(test_pmu_events);
> +		pr_info("SBI PMU event verification test : PASS\n");
> +	}
> +
> +	if (disabled_test_id != SBI_PMU_TEST_SNAPSHOT) {
> +		test_vm_events_snapshot_test(test_pmu_events_snaphost);
> +		pr_info("SBI PMU event verification with snapshot test : PASS\n");
> +	}
> +
> +	if (disabled_test_id != SBI_PMU_TEST_OVERFLOW) {
> +		test_vm_events_overflow(test_pmu_events_overflow);
> +		pr_info("SBI PMU event verification with overflow test : PASS\n");
> +	}
>  
>  	return 0;
>  }
> -- 
> 2.34.1
>

Thanks,
drew