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| author | Jan Beulich <JBeulich@suse.com> | 2016-06-27 00:35:12 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-07-09 01:05:30 +0200 |
| commit | 3451ab3ebf92b12801878d8b5c94845afd4219f0 (patch) | |
| tree | 60b304f2539da187b430ae0539e2657b6487e646 | |
| parent | b55a0262a4fb4a9754f8a3319df0a6d2fe4c4c58 (diff) | |
| download | linux-3451ab3ebf92b12801878d8b5c94845afd4219f0.tar.bz2 | |
intel_idle: re-work bxt_idle_state_table_update() and its helper
Since irtl_ns_units[] has itself zero entries, make sure the caller
recognized those cases along with the MSR read returning zero, as zero
is not a valid value for exit_latency and target_residency.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/idle/intel_idle.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 170ab8e01075..5300f2545e2a 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1187,6 +1187,9 @@ static unsigned long long irtl_2_usec(unsigned long long irtl) { unsigned long long ns; + if (!irtl) + return 0; + ns = irtl_ns_units[(irtl >> 10) & 0x3]; return div64_u64((irtl & 0x3FF) * ns, 1000); @@ -1200,43 +1203,39 @@ static unsigned long long irtl_2_usec(unsigned long long irtl) static void bxt_idle_state_table_update(void) { unsigned long long msr; + unsigned int usec; rdmsrl(MSR_PKGC6_IRTL, msr); - if (msr) { - unsigned int usec = irtl_2_usec(msr); - + usec = irtl_2_usec(msr); + if (usec) { bxt_cstates[2].exit_latency = usec; bxt_cstates[2].target_residency = usec; } rdmsrl(MSR_PKGC7_IRTL, msr); - if (msr) { - unsigned int usec = irtl_2_usec(msr); - + usec = irtl_2_usec(msr); + if (usec) { bxt_cstates[3].exit_latency = usec; bxt_cstates[3].target_residency = usec; } rdmsrl(MSR_PKGC8_IRTL, msr); - if (msr) { - unsigned int usec = irtl_2_usec(msr); - + usec = irtl_2_usec(msr); + if (usec) { bxt_cstates[4].exit_latency = usec; bxt_cstates[4].target_residency = usec; } rdmsrl(MSR_PKGC9_IRTL, msr); - if (msr) { - unsigned int usec = irtl_2_usec(msr); - + usec = irtl_2_usec(msr); + if (usec) { bxt_cstates[5].exit_latency = usec; bxt_cstates[5].target_residency = usec; } rdmsrl(MSR_PKGC10_IRTL, msr); - if (msr) { - unsigned int usec = irtl_2_usec(msr); - + usec = irtl_2_usec(msr); + if (usec) { bxt_cstates[6].exit_latency = usec; bxt_cstates[6].target_residency = usec; } |