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powerpc/perf: Add a shared interface to get gpci version and capabilities

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This exposes a simple way to grab the firmware provided
collect_priveliged, ga, expanded, and lab capability bits. All of these
bits come in from the same gpci request, so we've exposed all of them.

Only the collect_priveliged bit is really used by the hv-gpci/hv-24x7
code, the other bits are simply exposed in sysfs to inform the user.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Cody P Schafer 2014-03-14 16:00:39 +11:00 • committed by Benjamin Herrenschmidt
parent a8b2c43671
commit 2d1b21ad7d
2 changed files with 56 additions and 0 deletions
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39
arch/powerpc/perf/hv-common.c Normal file
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#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;
}

17
arch/powerpc/perf/hv-common.h Normal file
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#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