Messages in this thread |  | | Date | Tue, 25 Feb 2014 13:20:59 -0800 | From | Cody P Schafer <> | Subject | Re: [PATCH v2 07/11] powerpc: add a shared interface to get gpci version and capabilities |
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On 02/24/2014 07:33 PM, Michael Ellerman wrote: > [PATCH v2 07/11] powerpc: add a shared interface to get gpci version and capabilities > > All the patches that touch perf should be "powerpc/perf: foo"
Ok.
> On Fri, 2014-14-02 at 22:02:11 UTC, Cody P Schafer wrote: >> ... > > I realise this is a fairly small patch but a changelog is still nice. You could > for example mention that we don't currently use .ga, .expanded or .lab but > we're adding the logic anyway because ... >
Well, we do use them to expose some more information to the user (via sysfs attributes). Always nice to know what capabilities are enabled.
But sure, I can explain why each bit in that structure is a good idea.
> >> Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> >> --- >> arch/powerpc/perf/hv-common.c | 39 +++++++++++++++++++++++++++++++++++++++ >> arch/powerpc/perf/hv-common.h | 17 +++++++++++++++++ >> 2 files changed, 56 insertions(+) >> create mode 100644 arch/powerpc/perf/hv-common.c >> create mode 100644 arch/powerpc/perf/hv-common.h >> >> diff --git a/arch/powerpc/perf/hv-common.c b/arch/powerpc/perf/hv-common.c >> new file mode 100644 >> index 0000000..47e02b3 >> --- /dev/null >> +++ b/arch/powerpc/perf/hv-common.c >> @@ -0,0 +1,39 @@ >> +#include <asm/io.h> >> +#include <asm/hvcall.h> >> + >> +#include "hv-gpci.h" >> +#include "hv-common.h" >> + >> +unsigned long hv_perf_caps_get(struct hv_perf_caps *caps) >> +{ >> + unsigned long r; >> + struct p { >> + struct hv_get_perf_counter_info_params params; >> + struct cv_system_performance_capabilities caps; >> + } __packed __aligned(sizeof(uint64_t)); >> + >> + struct p arg = { >> + .params = { >> + .counter_request = cpu_to_be32( >> + CIR_SYSTEM_PERFORMANCE_CAPABILITIES), >> + .starting_index = cpu_to_be32(-1), >> + .counter_info_version_in = 0, >> + } >> + }; >> + >> + r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, >> + virt_to_phys(&arg), sizeof(arg)); >> + >> + if (r) >> + return r; >> + >> + pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask); >> + >> + caps->version = arg.params.counter_info_version_out; >> + caps->collect_privileged = !!arg.caps.perf_collect_privileged; >> + caps->ga = !!(arg.caps.capability_mask & CV_CM_GA); >> + caps->expanded = !!(arg.caps.capability_mask & CV_CM_EXPANDED); >> + caps->lab = !!(arg.caps.capability_mask & CV_CM_LAB); >> + >> + return r; >> +} >> diff --git a/arch/powerpc/perf/hv-common.h b/arch/powerpc/perf/hv-common.h >> new file mode 100644 >> index 0000000..7e615bd >> --- /dev/null >> +++ b/arch/powerpc/perf/hv-common.h >> @@ -0,0 +1,17 @@ >> +#ifndef LINUX_POWERPC_PERF_HV_COMMON_H_ >> +#define LINUX_POWERPC_PERF_HV_COMMON_H_ >> + >> +#include <linux/types.h> >> + >> +struct hv_perf_caps { >> + u16 version; >> + u16 collect_privileged:1, >> + ga:1, >> + expanded:1, >> + lab:1, >> + unused:12; >> +}; >> + >> +unsigned long hv_perf_caps_get(struct hv_perf_caps *caps); >> + >> +#endif >> -- >> 1.8.5.4 >> >> >
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