Received-SPF: pass (google.com: domain of linux-kernel+bounces-131278-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1;
Date: Thu, 4 Apr 2024 13:02:24 +0200
From: Andrew Jones <ajones@ventanamicro.com>
To: Atish Patra <atishp@rivosinc.com>
Cc: linux-kernel@vger.kernel.org, Palmer Dabbelt <palmer@rivosinc.com>, 
	Conor Dooley <conor.dooley@microchip.com>, Anup Patel <anup@brainfault.org>, Ajay Kaher <akaher@vmware.com>, 
	Alexandre Ghiti <alexghiti@rivosinc.com>, Alexey Makhalov <amakhalov@vmware.com>, 
	Juergen Gross <jgross@suse.com>, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, 
	linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, 
	Mark Rutland <mark.rutland@arm.com>, Palmer Dabbelt <palmer@dabbelt.com>, 
	Paolo Bonzini <pbonzini@redhat.com>, Paul Walmsley <paul.walmsley@sifive.com>, 
	Shuah Khan <shuah@kernel.org>, virtualization@lists.linux.dev, 
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>, Will Deacon <will@kernel.org>, x86@kernel.org
Subject: Re: [PATCH v5 03/22] drivers/perf: riscv: Read upper bits of a
 firmware counter
Message-ID: <20240404-89ee7d7f90a5fcc91809065e@orel>
References: <20240403080452.1007601-1-atishp@rivosinc.com>
 <20240403080452.1007601-4-atishp@rivosinc.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240403080452.1007601-4-atishp@rivosinc.com>

On Wed, Apr 03, 2024 at 01:04:32AM -0700, Atish Patra wrote:
> SBI v2.0 introduced a explicit function to read the upper 32 bits
> for any firmware counter width that is longer than 32bits.
> This is only applicable for RV32 where firmware counter can be
> 64 bit.
> 
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> Reviewed-by: Anup Patel <anup@brainfault.org>
> Signed-off-by: Atish Patra <atishp@rivosinc.com>
> ---
>  drivers/perf/riscv_pmu_sbi.c | 25 ++++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index 3e44d2fb8bf8..babf1b9a4dbe 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -57,6 +57,8 @@ asm volatile(ALTERNATIVE(						\
>  PMU_FORMAT_ATTR(event, "config:0-47");
>  PMU_FORMAT_ATTR(firmware, "config:63");
>  
> +static bool sbi_v2_available;
> +
>  static struct attribute *riscv_arch_formats_attr[] = {
>  	&format_attr_event.attr,
>  	&format_attr_firmware.attr,
> @@ -511,19 +513,29 @@ static u64 pmu_sbi_ctr_read(struct perf_event *event)
>  	struct hw_perf_event *hwc = &event->hw;
>  	int idx = hwc->idx;
>  	struct sbiret ret;
> -	union sbi_pmu_ctr_info info;
>  	u64 val = 0;
> +	union sbi_pmu_ctr_info info = pmu_ctr_list[idx];
>  
>  	if (pmu_sbi_is_fw_event(event)) {
>  		ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ,
>  				hwc->idx, 0, 0, 0, 0, 0);
> -		if (!ret.error)
> -			val = ret.value;
> +		if (ret.error)
> +			return 0;
> +
> +		val = ret.value;
> +		if (IS_ENABLED(CONFIG_32BIT) && sbi_v2_available && info.width >= 32) {
> +			ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ_HI,
> +					hwc->idx, 0, 0, 0, 0, 0);
> +			if (!ret.error)
> +				val |= ((u64)ret.value << 32);
> +			else
> +				WARN_ONCE(1, "Unable to read upper 32 bits of firmware counter error: %d\n",
> +					  sbi_err_map_linux_errno(ret.error));

I don't think we should use sbi_err_map_linux_errno() in this case since
we don't have a 1:1 mapping of SBI errors to Linux errors and we don't
propagate the error as a Linux error. For warnings, it's better to output
the exact SBI error.

> +		}
>  	} else {
> -		info = pmu_ctr_list[idx];
>  		val = riscv_pmu_ctr_read_csr(info.csr);
>  		if (IS_ENABLED(CONFIG_32BIT))
> -			val = ((u64)riscv_pmu_ctr_read_csr(info.csr + 0x80)) << 31 | val;
> +			val |= ((u64)riscv_pmu_ctr_read_csr(info.csr + 0x80)) << 32;
>  	}
>  
>  	return val;
> @@ -1135,6 +1147,9 @@ static int __init pmu_sbi_devinit(void)
>  		return 0;
>  	}
>  
> +	if (sbi_spec_version >= sbi_mk_version(2, 0))
> +		sbi_v2_available = true;
> +
>  	ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING,
>  				      "perf/riscv/pmu:starting",
>  				      pmu_sbi_starting_cpu, pmu_sbi_dying_cpu);
> -- 
> 2.34.1
>

Thanks,
drew