diff options
| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2014-03-14 16:00:39 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-03-24 09:48:30 +1100 |
| commit | 2d1b21ad7d1574c7aaa5b9acdb3a02fd37a11c01 (patch) | |
| tree | 1703905a2d69eba4db5cc13cd51e62292b3ec505 | |
| parent | a8b2c4367179e65c2ac945a284ab5d77be161bdf (diff) | |
| download | linux-2d1b21ad7d1574c7aaa5b9acdb3a02fd37a11c01.tar.bz2 | |
powerpc/perf: Add a shared interface to get gpci version and capabilities
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>
| -rw-r--r-- | arch/powerpc/perf/hv-common.c | 39 | ||||
| -rw-r--r-- | arch/powerpc/perf/hv-common.h | 17 |
2 files changed, 56 insertions, 0 deletions
diff --git a/arch/powerpc/perf/hv-common.c b/arch/powerpc/perf/hv-common.c new file mode 100644 index 000000000000..47e02b366f58 --- /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 000000000000..7e615bd38bca --- /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 |