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hwpstate: Add support for family 17h pstate info from MSRs

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This information is normally available via acpi_perf, but in case it is not,
add support for fetching the information via MSRs on AMD family 17h (Zen)
processors.  Zen uses a slightly different formula than previous generation
AMD CPUs.

This was inspired by, but does not fix, PR 221621.

Reported by:	Sean P. R. <seanpr AT swbell.net>
Reviewed by:	mjoras@
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D12082
This commit is contained in:
cem 2017-08-20 00:41:49 +00:00
parent d61f277f2c
commit 379d4cc48c
1 changed files with 13 additions and 0 deletions
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13
sys/x86/cpufreq/hwpstate.c
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@ -83,6 +83,10 @@ __FBSDID("$FreeBSD$");
#define AMD_10H_11H_CUR_DID(msr) (((msr) >> 6) & 0x07)
#define AMD_10H_11H_CUR_FID(msr) ((msr) & 0x3F)
#define AMD_17H_CUR_VID(msr) (((msr) >> 14) & 0xFF)
#define AMD_17H_CUR_DID(msr) (((msr) >> 8) & 0x3F)
#define AMD_17H_CUR_FID(msr) ((msr) & 0xFF)
#define HWPSTATE_DEBUG(dev, msg...) \
do{ \
if(hwpstate_verbose) \
@ -427,6 +431,15 @@ hwpstate_get_info_from_msr(device_t dev)
case 0x16:
hwpstate_set[i].freq = (100 * (fid + 0x10)) >> did;
break;
case 0x17:
did = AMD_17H_CUR_DID(msr);
if (did == 0) {
HWPSTATE_DEBUG(dev, "unexpected did: 0\n");
did = 1;
}
fid = AMD_17H_CUR_FID(msr);
hwpstate_set[i].freq = (200 * fid) / did;
break;
default:
HWPSTATE_DEBUG(dev, "get_info_from_msr: AMD family"
" 0x%02x CPUs are not supported yet\n", family);