lkml.org 
[lkml]   [2018]   [Apr]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3] cpufreq: cppc_cpufreq: Initialize shared cpu's perf capabilities
On 06-04-18, 10:43, Shunyong Yang wrote:
> When multiple cpus are related in one cpufreq policy, the first online
> cpu will be chosen by default to handle cpufreq operations. Let's take
> cpu0 and cpu1 as an example.
>
> When cpu0 is offline, policy->cpu will be shifted to cpu1. Cpu1's perf
> capabilities should be initialized. Otherwise, perf capabilities are 0s
> and speed change can not take effect.
>
> This patch copies perf capabilities of the first online cpu to other
> shared cpus when policy shared type is CPUFREQ_SHARED_TYPE_ANY.
>
> Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
> ---
>
> Changes in v3:
> -Remove unnecessary wrap per Kumar's comments.
>
> Changes in v2:
> -Add unlikely in cpu comparison per Kumar's comments.
> -Fix coding style per Kumar's comments.
>
> Changes in v1:
> -Drop RFC tag,
> The original RFC link,
> https://patchwork.kernel.org/patch/10299055/.
>
> This patch solves same issue as RFC above.
>
> Patch name is changed as code is too much different with RFC above.
>
> -Remove extra init() per Viresh Kumar's comments and only handle
> CPPC CPUFREQ_SHARED_TYPE_ANY case.
>
> ---
> drivers/cpufreq/cppc_cpufreq.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> index 8300a9fcb80c..8b432d6e846d 100644
> --- a/drivers/cpufreq/cppc_cpufreq.c
> +++ b/drivers/cpufreq/cppc_cpufreq.c
> @@ -167,9 +167,19 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
> NSEC_PER_USEC;
> policy->shared_type = cpu->shared_type;
>
> - if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
> + if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
> + int i;
> +
> cpumask_copy(policy->cpus, cpu->shared_cpu_map);
> - else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
> +
> + for_each_cpu(i, policy->cpus) {
> + if (unlikely(i == policy->cpu))
> + continue;
> +
> + memcpy(&all_cpu_data[i]->perf_caps, &cpu->perf_caps,
> + sizeof(cpu->perf_caps));
> + }
> + } else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
> /* Support only SW_ANY for now. */
> pr_debug("Unsupported CPU co-ord type\n");
> return -EFAULT;

LGTM. Thanks.

--
viresh

\
 
 \ /
  Last update: 2018-04-06 07:07    [W:0.033 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site