[PATCH 03/19] ACPI: CPPC: add cppc enable register function

Huang Rui
2021-09-08T15:01:31Z

From: Jinzhou Su <Jinzhou.Su@amd.com>

Export the cppc enable register function for future use.

Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
drivers/acpi/cppc_acpi.c | 42 ++++++++++++++++++++++++++++++++++++++++
include/acpi/cppc_acpi.h | 5 +++++
2 files changed, 47 insertions(+)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index a4d4eebba1da..de4b30545215 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1220,6 +1220,48 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
}
EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);

+/**
+ * cppc_set_enable - Set to enable CPPC register.
+ * @cpu: CPU for which to enable CPPC register.
+ * @enable: enable field to write into share memory.
+ *
+ * Return: 0 for success, -ERRNO otherwise.
+ */
+int cppc_set_enable(int cpu, u32 enable)
+{
+ int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
+ struct cpc_register_resource *enable_reg;
+ struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
+ struct cppc_pcc_data *pcc_ss_data = NULL;
+ int ret = -1;
+
+ if (!cpc_desc) {
+ pr_debug("No CPC descriptor for CPU:%d\n", cpu);
+ return -ENODEV;
+ }
+
+ enable_reg = &cpc_desc->cpc_regs[ENABLE];
+
+ if (CPC_IN_PCC(enable_reg)) {
+
+ if (pcc_ss_id < 0)
+ return -EIO;
+
+ ret = cpc_write(cpu, enable_reg, enable);
+ if (ret)
+ return ret;
+
+ pcc_ss_data = pcc_data[pcc_ss_id];
+
+ down_write(&pcc_ss_data->pcc_lock);
+ send_pcc_cmd(pcc_ss_id, CMD_WRITE);
+ up_write(&pcc_ss_data->pcc_lock);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cppc_set_enable);
+
/**
* cppc_set_perf - Set a CPU's performance controls.
* @cpu: CPU for which to set performance controls.
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 9f4985b4d64d..3fdae40a75fc 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -137,6 +137,7 @@ struct cppc_cpudata {
extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
+extern int cppc_set_enable(int cpu, u32 enable);
extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
extern bool acpi_cpc_valid(void);
extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
@@ -157,6 +158,10 @@ static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
{
return -ENOTSUPP;
}
+static inline int cppc_set_enable(int cpu, u32 enable)
+{
+ return -ENOTSUPP;
+}
static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
{
return -ENOTSUPP;
--
2.25.1