Messages in this thread Patch in this message | | | From | Xiongfeng Wang <> | Subject | [PATCH v2 1/2] ACPI / CPPC: Add a helper to get desired performance | Date | Thu, 14 Feb 2019 15:46:07 +0800 |
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This patch add a helper to get the value of desired performance register.
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> --- drivers/acpi/cppc_acpi.c | 38 ++++++++++++++++++++++++++++++++++++++ include/acpi/cppc_acpi.h | 1 + 2 files changed, 39 insertions(+)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 217a782..93588c5 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1051,6 +1051,44 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) } /** + * cppc_get_desired_perf - Get the value of desired performance register. + * @cpunum: CPU from which to get desired performance. + * @desired_perf: address of a variable to store the returned desired performance + * + * Return: 0 for success, -EIO otherwise. + */ +int cppc_get_desired_perf(int cpunum, u64 *desired_perf) +{ + struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); + struct cpc_register_resource *desired_reg; + struct cppc_pcc_data *pcc_ss_data = NULL; + int regs_in_pcc = 0; + + desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF]; + + if (CPC_IN_PCC(desired_reg)) { + if (pcc_ss_id < 0) + return -EIO; + pcc_ss_data = pcc_data[pcc_ss_id]; + down_write(&pcc_ss_data->pcc_lock); + regs_in_pcc = 1; + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { + up_write(&pcc_ss_data->pcc_lock); + return -EIO; + } + } + + cpc_read(cpunum, desired_reg, desired_perf); + + if (regs_in_pcc) + up_write(&pcc_ss_data->pcc_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(cppc_get_desired_perf); + +/** * cppc_get_perf_caps - Get a CPUs performance capabilities. * @cpunum: CPU from which to get capabilities info. * @perf_caps: ptr to cppc_perf_caps. See cppc_acpi.h diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index 4f34734..ba6fd72 100644 --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -137,6 +137,7 @@ struct cppc_cpudata { cpumask_var_t shared_cpu_map; }; +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_get_perf_caps(int cpu, struct cppc_perf_caps *caps); -- 1.7.12.4
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