Messages in this thread Patch in this message | | | From | Huang Rui <> | Subject | [PATCH v2 04/21] ACPI: CPPC: add cppc enable register function | Date | Sun, 26 Sep 2021 17:05:48 +0800 |
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From: Jinzhou Su <Jinzhou.Su@amd.com>
Add a new function to enable CPPC feature. This function will write Continuous Performance Control package EnableRegister field on the processor.
Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> --- drivers/acpi/cppc_acpi.c | 48 ++++++++++++++++++++++++++++++++++++++++ include/acpi/cppc_acpi.h | 5 +++++ 2 files changed, 53 insertions(+)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 2efe2ba97d96..b285960c35e7 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1220,6 +1220,54 @@ 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 on the processor by writing the + * Continuous Performance Control package EnableRegister feild. + * @cpu: CPU for which to enable CPPC register. + * @enable: 0 - disable, 1 - enable CPPC feature on the processor. + * + * Return: 0 for success, -ERRNO or -EIO 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; + + /* check the input value*/ + if (cpu < 0 || cpu > num_possible_cpus() - 1 || enable > 1) + return -ENODEV; + + 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); + /* 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; +} +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
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