2d1b21ad7d
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>
39 lines
996 B
C
39 lines
996 B
C
#include <asm/io.h>
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#include <asm/hvcall.h>
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#include "hv-gpci.h"
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#include "hv-common.h"
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unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)
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{
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unsigned long r;
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struct p {
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struct hv_get_perf_counter_info_params params;
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struct cv_system_performance_capabilities caps;
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} __packed __aligned(sizeof(uint64_t));
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struct p arg = {
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.params = {
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.counter_request = cpu_to_be32(
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CIR_SYSTEM_PERFORMANCE_CAPABILITIES),
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.starting_index = cpu_to_be32(-1),
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.counter_info_version_in = 0,
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}
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};
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r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
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virt_to_phys(&arg), sizeof(arg));
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if (r)
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return r;
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pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);
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caps->version = arg.params.counter_info_version_out;
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caps->collect_privileged = !!arg.caps.perf_collect_privileged;
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caps->ga = !!(arg.caps.capability_mask & CV_CM_GA);
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caps->expanded = !!(arg.caps.capability_mask & CV_CM_EXPANDED);
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caps->lab = !!(arg.caps.capability_mask & CV_CM_LAB);
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return r;
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}
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