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[kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct

Eric Auger posted 9 patches 5 years, 9 months ago
There is a newer version of this series
[kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct
Posted by Eric Auger 5 years, 9 months ago 
This struct aims at storing information potentially used by
all tests such as the pmu version, the read-only part of the
PMCR, the number of implemented event counters, ...

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 arm/pmu.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/arm/pmu.c b/arm/pmu.c
index e5e012d..d24857e 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -33,7 +33,14 @@
 
 #define NR_SAMPLES 10
 
-static unsigned int pmu_version;
+struct pmu {
+	unsigned int version;
+	unsigned int nb_implemented_counters;
+	uint32_t pmcr_ro;
+};
+
+static struct pmu pmu;
+
 #if defined(__arm__)
 #define ID_DFR0_PERFMON_SHIFT 24
 #define ID_DFR0_PERFMON_MASK  0xf
@@ -265,7 +272,7 @@ static bool check_cpi(int cpi)
 static void pmccntr64_test(void)
 {
 #ifdef __arm__
-	if (pmu_version == 0x3) {
+	if (pmu.version == 0x3) {
 		if (ERRATA(9e3f7a296940)) {
 			write_sysreg(0xdead, PMCCNTR64);
 			report(read_sysreg(PMCCNTR64) == 0xdead, "pmccntr64");
@@ -278,9 +285,22 @@ static void pmccntr64_test(void)
 /* Return FALSE if no PMU found, otherwise return TRUE */
 static bool pmu_probe(void)
 {
-	pmu_version = get_pmu_version();
-	report_info("PMU version: %d", pmu_version);
-	return pmu_version != 0 && pmu_version != 0xf;
+	uint32_t pmcr;
+
+	pmu.version = get_pmu_version();
+	report_info("PMU version: %d", pmu.version);
+
+	if (pmu.version == 0 || pmu.version == 0xF)
+		return false;
+
+	pmcr = get_pmcr();
+	pmu.pmcr_ro = pmcr & 0xFFFFFF80;
+	pmu.nb_implemented_counters =
+		(pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK;
+	report_info("Implements %d event counters",
+		    pmu.nb_implemented_counters);
+
+	return true;
 }
 
 int main(int argc, char *argv[])
-- 
2.20.1
Re: [kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct
Posted by Andre Przywara 5 years, 8 months ago 
On Thu, 30 Jan 2020 12:25:04 +0100
Eric Auger <eric.auger@redhat.com> wrote:

> This struct aims at storing information potentially used by
> all tests such as the pmu version, the read-only part of the
> PMCR, the number of implemented event counters, ...
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>

As I stated already in v1:

Reviewed-by: Andre Przywara <andre.przywara@arm.com>

Cheers,
Andre

> ---
>  arm/pmu.c | 30 +++++++++++++++++++++++++-----
>  1 file changed, 25 insertions(+), 5 deletions(-)
> 
> diff --git a/arm/pmu.c b/arm/pmu.c
> index e5e012d..d24857e 100644
> --- a/arm/pmu.c
> +++ b/arm/pmu.c
> @@ -33,7 +33,14 @@
>  
>  #define NR_SAMPLES 10
>  
> -static unsigned int pmu_version;
> +struct pmu {
> +	unsigned int version;
> +	unsigned int nb_implemented_counters;
> +	uint32_t pmcr_ro;
> +};
> +
> +static struct pmu pmu;
> +
>  #if defined(__arm__)
>  #define ID_DFR0_PERFMON_SHIFT 24
>  #define ID_DFR0_PERFMON_MASK  0xf
> @@ -265,7 +272,7 @@ static bool check_cpi(int cpi)
>  static void pmccntr64_test(void)
>  {
>  #ifdef __arm__
> -	if (pmu_version == 0x3) {
> +	if (pmu.version == 0x3) {
>  		if (ERRATA(9e3f7a296940)) {
>  			write_sysreg(0xdead, PMCCNTR64);
>  			report(read_sysreg(PMCCNTR64) == 0xdead, "pmccntr64");
> @@ -278,9 +285,22 @@ static void pmccntr64_test(void)
>  /* Return FALSE if no PMU found, otherwise return TRUE */
>  static bool pmu_probe(void)
>  {
> -	pmu_version = get_pmu_version();
> -	report_info("PMU version: %d", pmu_version);
> -	return pmu_version != 0 && pmu_version != 0xf;
> +	uint32_t pmcr;
> +
> +	pmu.version = get_pmu_version();
> +	report_info("PMU version: %d", pmu.version);
> +
> +	if (pmu.version == 0 || pmu.version == 0xF)
> +		return false;
> +
> +	pmcr = get_pmcr();
> +	pmu.pmcr_ro = pmcr & 0xFFFFFF80;
> +	pmu.nb_implemented_counters =
> +		(pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK;
> +	report_info("Implements %d event counters",
> +		    pmu.nb_implemented_counters);
> +
> +	return true;
>  }
>  
>  int main(int argc, char *argv[])
Re: [kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct
Posted by Auger Eric 5 years, 8 months ago 
Hi Andre,

On 3/4/20 7:02 PM, Andre Przywara wrote:
> On Thu, 30 Jan 2020 12:25:04 +0100
> Eric Auger <eric.auger@redhat.com> wrote:
> 
>> This struct aims at storing information potentially used by
>> all tests such as the pmu version, the read-only part of the
>> PMCR, the number of implemented event counters, ...
>>
>> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> 
> As I stated already in v1:
Hum that's an oversight. Please forgive for the 2 R-b's I have forgotten.

Thanks

Eric
> 
> Reviewed-by: Andre Przywara <andre.przywara@arm.com>


> 
> Cheers,
> Andre
> 
>> ---
>>  arm/pmu.c | 30 +++++++++++++++++++++++++-----
>>  1 file changed, 25 insertions(+), 5 deletions(-)
>>
>> diff --git a/arm/pmu.c b/arm/pmu.c
>> index e5e012d..d24857e 100644
>> --- a/arm/pmu.c
>> +++ b/arm/pmu.c
>> @@ -33,7 +33,14 @@
>>  
>>  #define NR_SAMPLES 10
>>  
>> -static unsigned int pmu_version;
>> +struct pmu {
>> +	unsigned int version;
>> +	unsigned int nb_implemented_counters;
>> +	uint32_t pmcr_ro;
>> +};
>> +
>> +static struct pmu pmu;
>> +
>>  #if defined(__arm__)
>>  #define ID_DFR0_PERFMON_SHIFT 24
>>  #define ID_DFR0_PERFMON_MASK  0xf
>> @@ -265,7 +272,7 @@ static bool check_cpi(int cpi)
>>  static void pmccntr64_test(void)
>>  {
>>  #ifdef __arm__
>> -	if (pmu_version == 0x3) {
>> +	if (pmu.version == 0x3) {
>>  		if (ERRATA(9e3f7a296940)) {
>>  			write_sysreg(0xdead, PMCCNTR64);
>>  			report(read_sysreg(PMCCNTR64) == 0xdead, "pmccntr64");
>> @@ -278,9 +285,22 @@ static void pmccntr64_test(void)
>>  /* Return FALSE if no PMU found, otherwise return TRUE */
>>  static bool pmu_probe(void)
>>  {
>> -	pmu_version = get_pmu_version();
>> -	report_info("PMU version: %d", pmu_version);
>> -	return pmu_version != 0 && pmu_version != 0xf;
>> +	uint32_t pmcr;
>> +
>> +	pmu.version = get_pmu_version();
>> +	report_info("PMU version: %d", pmu.version);
>> +
>> +	if (pmu.version == 0 || pmu.version == 0xF)
>> +		return false;
>> +
>> +	pmcr = get_pmcr();
>> +	pmu.pmcr_ro = pmcr & 0xFFFFFF80;
>> +	pmu.nb_implemented_counters =
>> +		(pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK;
>> +	report_info("Implements %d event counters",
>> +		    pmu.nb_implemented_counters);
>> +
>> +	return true;
>>  }
>>  
>>  int main(int argc, char *argv[])
>
Re: [kvm-unit-tests PATCH v2 3/9] arm: pmu: Add a pmu struct
Posted by Andrew Jones 5 years, 8 months ago 
On Thu, Jan 30, 2020 at 12:25:04PM +0100, Eric Auger wrote:
> This struct aims at storing information potentially used by
> all tests such as the pmu version, the read-only part of the
> PMCR, the number of implemented event counters, ...
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
>  arm/pmu.c | 30 +++++++++++++++++++++++++-----
>  1 file changed, 25 insertions(+), 5 deletions(-)
> 
> diff --git a/arm/pmu.c b/arm/pmu.c
> index e5e012d..d24857e 100644
> --- a/arm/pmu.c
> +++ b/arm/pmu.c
> @@ -33,7 +33,14 @@
>  
>  #define NR_SAMPLES 10
>  
> -static unsigned int pmu_version;
> +struct pmu {
> +	unsigned int version;
> +	unsigned int nb_implemented_counters;
> +	uint32_t pmcr_ro;
> +};
> +
> +static struct pmu pmu;
> +
>  #if defined(__arm__)
>  #define ID_DFR0_PERFMON_SHIFT 24
>  #define ID_DFR0_PERFMON_MASK  0xf
> @@ -265,7 +272,7 @@ static bool check_cpi(int cpi)
>  static void pmccntr64_test(void)
>  {
>  #ifdef __arm__
> -	if (pmu_version == 0x3) {
> +	if (pmu.version == 0x3) {
>  		if (ERRATA(9e3f7a296940)) {
>  			write_sysreg(0xdead, PMCCNTR64);
>  			report(read_sysreg(PMCCNTR64) == 0xdead, "pmccntr64");
> @@ -278,9 +285,22 @@ static void pmccntr64_test(void)
>  /* Return FALSE if no PMU found, otherwise return TRUE */
>  static bool pmu_probe(void)
>  {
> -	pmu_version = get_pmu_version();
> -	report_info("PMU version: %d", pmu_version);
> -	return pmu_version != 0 && pmu_version != 0xf;
> +	uint32_t pmcr;
> +
> +	pmu.version = get_pmu_version();
> +	report_info("PMU version: %d", pmu.version);
> +
> +	if (pmu.version == 0 || pmu.version == 0xF)
> +		return false;
> +
> +	pmcr = get_pmcr();
> +	pmu.pmcr_ro = pmcr & 0xFFFFFF80;

I'd prefer we spell out what fields we consider RO. Also this mask doesn't
seem right to me. BIT[7] isn't RO, is it?

> +	pmu.nb_implemented_counters =
> +		(pmcr >> PMU_PMCR_N_SHIFT) & PMU_PMCR_N_MASK;
> +	report_info("Implements %d event counters",
> +		    pmu.nb_implemented_counters);
> +
> +	return true;
>  }
>  
>  int main(int argc, char *argv[])
> -- 
> 2.20.1
> 
>

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