[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"
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 ...
> Signed-off-by: Cody P Schafer <c...@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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