Messages in this thread | | | Subject | Re: [PATCH 03/19] ACPI: CPPC: add cppc enable register function | From | "Fontenot, Nathan" <> | Date | Wed, 8 Sep 2021 14:14:37 -0500 |
| |
On 9/8/2021 9:59 AM, Huang Rui wrote: > 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);
Shouldn't we be checking the return value from send_pcc_cmd()?
Also, if the call to send_pcc_cmd() fails do we need to update enable_reg? i.e. cpc_write(..., !enable);
-Nathan
> + 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 >
| |