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Message-ID: <20241114084816.1128647-2-zhenglifeng1@huawei.com>
Date: Thu, 14 Nov 2024 16:48:14 +0800
From: Lifeng Zheng <zhenglifeng1@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>, <robert.moore@...el.com>,
<viresh.kumar@...aro.org>
CC: <acpica-devel@...ts.linux.dev>, <linux-acpi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
<zhanjie9@...ilicon.com>, <lihuisong@...wei.com>, <fanghao11@...wei.com>,
<zhenglifeng1@...wei.com>
Subject: [PATCH 1/3] ACPI: CPPC: Refactor register get and set ABIs
Refactor register get and set ABIs using cppc_get_reg() and cppc_set_reg().
Rename cppc_get_perf() to cppc_get_reg() as a generic function to read cppc
registers, with two changes:
1. Change the error kind to "no such device" when pcc_ss_id < 0, which
means that this cpu cannot get a valid pcc_ss_id.
2. Add a check to verify if the register is a cpc supported one before
using it.
Add cppc_set_reg() as a generic function for setting cppc registers. Unlike
other set reg ABIs, this function checks CPC_SUPPORTED right after getting
the register, because the rest of the operations are meaningless if this
register is not a cpc supported one.
Signed-off-by: Lifeng Zheng <zhenglifeng1@...wei.com>
---
drivers/acpi/cppc_acpi.c | 191 +++++++++++++++------------------------
1 file changed, 72 insertions(+), 119 deletions(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index c1f3568d0c50..306ced9c3376 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1179,10 +1179,13 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
return ret_val;
}
-static int cppc_get_perf(int cpunum, enum cppc_regs reg_idx, u64 *perf)
+static int cppc_get_reg(int cpunum, enum cppc_regs reg_idx, u64 *val)
{
struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
+ struct cppc_pcc_data *pcc_ss_data = NULL;
struct cpc_register_resource *reg;
+ int pcc_ss_id;
+ int ret = 0;
if (!cpc_desc) {
pr_debug("No CPC descriptor for CPU:%d\n", cpunum);
@@ -1191,20 +1194,23 @@ static int cppc_get_perf(int cpunum, enum cppc_regs reg_idx, u64 *perf)
reg = &cpc_desc->cpc_regs[reg_idx];
+ if (!CPC_SUPPORTED(reg)) {
+ pr_debug("CPC register (reg_idx=%u) is not supported\n", reg_idx);
+ return -EOPNOTSUPP;
+ }
+
if (CPC_IN_PCC(reg)) {
- int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
- struct cppc_pcc_data *pcc_ss_data = NULL;
- int ret = 0;
+ pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
if (pcc_ss_id < 0)
- return -EIO;
+ return -ENODEV;
pcc_ss_data = pcc_data[pcc_ss_id];
down_write(&pcc_ss_data->pcc_lock);
if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0)
- cpc_read(cpunum, reg, perf);
+ cpc_read(cpunum, reg, val);
else
ret = -EIO;
@@ -1213,21 +1219,65 @@ static int cppc_get_perf(int cpunum, enum cppc_regs reg_idx, u64 *perf)
return ret;
}
- cpc_read(cpunum, reg, perf);
+ cpc_read(cpunum, reg, val);
return 0;
}
+static int cppc_set_reg(int cpu, enum cppc_regs reg_idx, u64 val)
+{
+ struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
+ struct cppc_pcc_data *pcc_ss_data = NULL;
+ struct cpc_register_resource *reg;
+ int pcc_ss_id;
+ int ret;
+
+ if (!cpc_desc) {
+ pr_debug("No CPC descriptor for CPU:%d\n", cpu);
+ return -ENODEV;
+ }
+
+ reg = &cpc_desc->cpc_regs[reg_idx];
+
+ if (!CPC_SUPPORTED(reg)) {
+ pr_debug("CPC register (reg_idx=%u) is not supported\n", reg_idx);
+ return -EOPNOTSUPP;
+ }
+
+ if (CPC_IN_PCC(reg)) {
+ pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
+
+ if (pcc_ss_id < 0) {
+ pr_debug("Invalid pcc_ss_id\n");
+ return -ENODEV;
+ }
+
+ ret = cpc_write(cpu, reg, val);
+ 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);
+ return ret;
+ }
+
+ return cpc_write(cpu, reg, val);
+}
+
/**
* cppc_get_desired_perf - Get the desired performance register value.
* @cpunum: CPU from which to get desired performance.
* @desired_perf: Return address.
*
- * Return: 0 for success, -EIO otherwise.
+ * Return: 0 for success, -ERRNO otherwise.
*/
int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
- return cppc_get_perf(cpunum, DESIRED_PERF, desired_perf);
+ return cppc_get_reg(cpunum, DESIRED_PERF, desired_perf);
}
EXPORT_SYMBOL_GPL(cppc_get_desired_perf);
@@ -1236,11 +1286,11 @@ EXPORT_SYMBOL_GPL(cppc_get_desired_perf);
* @cpunum: CPU from which to get nominal performance.
* @nominal_perf: Return address.
*
- * Return: 0 for success, -EIO otherwise.
+ * Return: 0 for success, -ERRNO otherwise.
*/
int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
{
- return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf);
+ return cppc_get_reg(cpunum, NOMINAL_PERF, nominal_perf);
}
/**
@@ -1248,11 +1298,11 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
* @cpunum: CPU from which to get highest performance.
* @highest_perf: Return address.
*
- * Return: 0 for success, -EIO otherwise.
+ * Return: 0 for success, -ERRNO otherwise.
*/
int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
{
- return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf);
+ return cppc_get_reg(cpunum, HIGHEST_PERF, highest_perf);
}
EXPORT_SYMBOL_GPL(cppc_get_highest_perf);
@@ -1261,11 +1311,11 @@ EXPORT_SYMBOL_GPL(cppc_get_highest_perf);
* @cpunum: CPU from which to get epp preference value.
* @epp_perf: Return address.
*
- * Return: 0 for success, -EIO otherwise.
+ * Return: 0 for success, -ERRNO otherwise.
*/
int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
- return cppc_get_perf(cpunum, ENERGY_PERF, epp_perf);
+ return cppc_get_reg(cpunum, ENERGY_PERF, epp_perf);
}
EXPORT_SYMBOL_GPL(cppc_get_epp_perf);
@@ -1545,44 +1595,14 @@ EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
*/
int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
{
- struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
- struct cpc_register_resource *auto_sel_reg;
- u64 auto_sel;
-
- if (!cpc_desc) {
- pr_debug("No CPC descriptor for CPU:%d\n", cpunum);
- return -ENODEV;
- }
-
- auto_sel_reg = &cpc_desc->cpc_regs[AUTO_SEL_ENABLE];
-
- if (!CPC_SUPPORTED(auto_sel_reg))
- pr_warn_once("Autonomous mode is not unsupported!\n");
-
- if (CPC_IN_PCC(auto_sel_reg)) {
- int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
- struct cppc_pcc_data *pcc_ss_data = NULL;
- int ret = 0;
-
- if (pcc_ss_id < 0)
- return -ENODEV;
-
- pcc_ss_data = pcc_data[pcc_ss_id];
-
- down_write(&pcc_ss_data->pcc_lock);
-
- if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0) {
- cpc_read(cpunum, auto_sel_reg, &auto_sel);
- perf_caps->auto_sel = (bool)auto_sel;
- } else {
- ret = -EIO;
- }
-
- up_write(&pcc_ss_data->pcc_lock);
+ u64 auto_sel;
+ int ret;
+ ret = cppc_get_reg(cpunum, AUTO_SEL_ENABLE, &auto_sel);
+ if (ret)
return ret;
- }
+ perf_caps->auto_sel = (bool)auto_sel;
return 0;
}
EXPORT_SYMBOL_GPL(cppc_get_auto_sel_caps);
@@ -1594,43 +1614,7 @@ EXPORT_SYMBOL_GPL(cppc_get_auto_sel_caps);
*/
int cppc_set_auto_sel(int cpu, bool enable)
{
- int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
- 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 = -EINVAL;
-
- 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];
-
- if (CPC_IN_PCC(auto_sel_reg)) {
- if (pcc_ss_id < 0) {
- pr_debug("Invalid pcc_ss_id\n");
- return -ENODEV;
- }
-
- if (CPC_SUPPORTED(auto_sel_reg)) {
- ret = cpc_write(cpu, auto_sel_reg, enable);
- 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;
+ return cppc_set_reg(cpu, AUTO_SEL_ENABLE, enable);
}
EXPORT_SYMBOL_GPL(cppc_set_auto_sel);
@@ -1644,38 +1628,7 @@ EXPORT_SYMBOL_GPL(cppc_set_auto_sel);
*/
int cppc_set_enable(int cpu, bool 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 = -EINVAL;
-
- if (!cpc_desc) {
- pr_debug("No CPC descriptor for CPU:%d\n", cpu);
- return -EINVAL;
- }
-
- 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);
- /* after writing CPC, transfer the ownership of PCC to platfrom */
- ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
- up_write(&pcc_ss_data->pcc_lock);
- return ret;
- }
-
- return cpc_write(cpu, enable_reg, enable);
+ return cppc_set_reg(cpu, ENABLE, enable);
}
EXPORT_SYMBOL_GPL(cppc_set_enable);
--
2.33.0
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