Merge branch 'next' into for-linus

Prepare input updates for 6.4 merge window.

1 files changed, 70 insertions, 1 deletions

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 0f17b1c32718..c51d3ccb4cca 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -193,7 +193,7 @@ static struct attribute *cppc_attrs[] = {
 };
 ATTRIBUTE_GROUPS(cppc);
 
-static struct kobj_type cppc_ktype = {
+static const struct kobj_type cppc_ktype = {
 	.sysfs_ops = &kobj_sysfs_ops,
 	.default_groups = cppc_groups,
 };
@@ -595,6 +595,7 @@ bool __weak cpc_supported_by_cpu(void)
 
 /**
  * pcc_data_alloc() - Allocate the pcc_data memory for pcc subspace
+ * @pcc_ss_id: PCC Subspace index as in the PCC client ACPI package.
  *
  * Check and allocate the cppc_pcc_data memory.
  * In some processor configurations it is possible that same subspace
@@ -1154,6 +1155,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
 }
 
 /**
+ * cppc_get_epp_perf - Get the epp register value.
+ * @cpunum: CPU from which to get epp preference value.
+ * @epp_perf: Return address.
+ *
+ * Return: 0 for success, -EIO otherwise.
+ */
+int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
+{
+	return cppc_get_perf(cpunum, ENERGY_PERF, epp_perf);
+}
+EXPORT_SYMBOL_GPL(cppc_get_epp_perf);
+
+/**
  * cppc_get_perf_caps - Get a CPU's performance capabilities.
  * @cpunum: CPU from which to get capabilities info.
  * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h
@@ -1365,6 +1379,60 @@ out_err:
 }
 EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);
 
+/*
+ * Set Energy Performance Preference Register value through
+ * Performance Controls Interface
+ */
+int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
+{
+	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
+	struct cpc_register_resource *epp_set_reg;
+	struct cpc_register_resource *auto_sel_reg;
+	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
+	struct cppc_pcc_data *pcc_ss_data = NULL;
+	int ret;
+
+	if (!cpc_desc) {
+		pr_debug("No CPC descriptor for CPU:%d\n", cpu);
+		return -ENODEV;
+	}
+
+	auto_sel_reg = &cpc_desc->cpc_regs[AUTO_SEL_ENABLE];
+	epp_set_reg = &cpc_desc->cpc_regs[ENERGY_PERF];
+
+	if (CPC_IN_PCC(epp_set_reg) || CPC_IN_PCC(auto_sel_reg)) {
+		if (pcc_ss_id < 0) {
+			pr_debug("Invalid pcc_ss_id for CPU:%d\n", cpu);
+			return -ENODEV;
+		}
+
+		if (CPC_SUPPORTED(auto_sel_reg)) {
+			ret = cpc_write(cpu, auto_sel_reg, enable);
+			if (ret)
+				return ret;
+		}
+
+		if (CPC_SUPPORTED(epp_set_reg)) {
+			ret = cpc_write(cpu, epp_set_reg, perf_ctrls->energy_perf);
+			if (ret)
+				return ret;
+		}
+
+		pcc_ss_data = pcc_data[pcc_ss_id];
+
+		down_write(&pcc_ss_data->pcc_lock);
+		/* after writing CPC, transfer the ownership of PCC to platform */
+		ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
+		up_write(&pcc_ss_data->pcc_lock);
+	} else {
+		ret = -ENOTSUPP;
+		pr_debug("_CPC in PCC is not supported\n");
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
+
 /**
  * cppc_set_enable - Set to enable CPPC on the processor by writing the
  * Continuous Performance Control package EnableRegister field.
@@ -1536,6 +1604,7 @@ EXPORT_SYMBOL_GPL(cppc_set_perf);
 
 /**
  * cppc_get_transition_latency - returns frequency transition latency in ns
+ * @cpu_num: CPU number for per_cpu().
  *
  * ACPI CPPC does not explicitly specify how a platform can specify the
  * transition latency for performance change requests. The closest we have