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ACPI / CPPC: Read lowest nonlinear perf in cppc_get_perf_caps()

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Read lowest non linear perf in cppc_get_perf_caps so that it can be exposed
via sysfs to the usespace. Lowest non linear perf is the lowest performance
level at which nonlinear power savings are achieved.

Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Prakash, Prashanth 2017-03-29 13:49:59 -06:00 • committed by Rafael J. Wysocki
parent 4f7d029b9b
commit 368520a6b2
2 changed files with 12 additions and 8 deletions
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19
drivers/acpi/cppc_acpi.c
View file

@ -972,9 +972,9 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)
{ {
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, struct cpc_register_resource *highest_reg, *lowest_reg,
*nom_perf; *lowest_non_linear_reg, *nominal_reg;
u64 high, low, nom; u64 high, low, nom, min_nonlinear;
int ret = 0, regs_in_pcc = 0; int ret = 0, regs_in_pcc = 0;
if (!cpc_desc) { if (!cpc_desc) {
@ -984,12 +984,12 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)
highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF]; highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF];
lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF]; lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF];
ref_perf = &cpc_desc->cpc_regs[REFERENCE_PERF]; lowest_non_linear_reg = &cpc_desc->cpc_regs[LOW_NON_LINEAR_PERF];
nom_perf = &cpc_desc->cpc_regs[NOMINAL_PERF]; nominal_reg = &cpc_desc->cpc_regs[NOMINAL_PERF];
/* Are any of the regs PCC ?*/ /* Are any of the regs PCC ?*/
if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) ||
CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { CPC_IN_PCC(lowest_non_linear_reg) || CPC_IN_PCC(nominal_reg)) {
regs_in_pcc = 1; regs_in_pcc = 1;
down_write(&pcc_data.pcc_lock); down_write(&pcc_data.pcc_lock);
/* Ring doorbell once to update PCC subspace */ /* Ring doorbell once to update PCC subspace */
@ -1005,10 +1005,13 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)
cpc_read(cpunum, lowest_reg, &low); cpc_read(cpunum, lowest_reg, &low);
perf_caps->lowest_perf = low; perf_caps->lowest_perf = low;
cpc_read(cpunum, nom_perf, &nom); cpc_read(cpunum, nominal_reg, &nom);
perf_caps->nominal_perf = nom; perf_caps->nominal_perf = nom;
if (!high || !low || !nom) cpc_read(cpunum, lowest_non_linear_reg, &min_nonlinear);
perf_caps->lowest_nonlinear_perf = min_nonlinear;
if (!high || !low || !nom || !min_nonlinear)
ret = -EFAULT; ret = -EFAULT;
out_err: out_err:

1
include/acpi/cppc_acpi.h
View file

@ -103,6 +103,7 @@ struct cppc_perf_caps {
u32 highest_perf; u32 highest_perf;
u32 nominal_perf; u32 nominal_perf;
u32 lowest_perf; u32 lowest_perf;
u32 lowest_nonlinear_perf;
}; };
struct cppc_perf_ctrls { struct cppc_perf_ctrls {