Hi Viresh,
Thanks for the quick response.
What I mean is, every time i start the simulation with a new clock
frequency, I have my cpufreq_init function do the following
int steps;
policy->cpuinfo.max_freq = my_cpufreq_get(policy->cpu); //In KHz
policy->cpuinfo.min_freq = 100 * 1000; //In KHz
policy->cpuinfo.transition_latency = 10 * 1000; //In us
policy->cur = my_cpufreq_get(policy->cpu); //(I'm assuming that
the CPU frequency is always at the maximum before the driver takes
control.)
// Get the number of cpufreq steps - Each step is 200MHz
steps = get_cpufreq_steps(policy->cpuinfo.max_freq,
policy->cpuinfo.min_freq);
// Malloc the required space based on number of steps
dyn_cpufreq_table = kmalloc(sizeof(struct
cpufreq_frequency_table) * steps, GFP_KERNEL);
// Create entries in the table
create_freq_table(dyn_cpufreq_table, policy);
However, when I use this code, although my debug statements suggest
that the table is created successfully, sysfs shows no cpufreq under
/sys/devices/system/cpu/cpu0/
Am I doing something wrong? Is GFP_KERNEL the wrong flag to use for
this purpose?
Regards
Guru
On Tue, Mar 5, 2013 at 12:01 PM, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> Hi Guru,
>
> On Wed, Mar 6, 2013 at 12:15 AM, Guru Prasad <gurupras@xxxxxxxxxxx> wrote:
>> I'm trying to run the Linux kernel with the cpufreq driver in a
>> simulation environment where the CPU frequency can be modified.
>
> Okay.
>
>> This leaves me with two choices :
>> Either have several kernels with different static cpufreq_frequency tables or
>
> So you meant have different uImages per freq_table, right?
>
>> let the kernel create the cpufreq_frequency_table dynamically.
>
> Didn't get that completely :(
> You want the kernel to create this table dynamically, yes we can allocate memory
> for it dynamically, but we need some input from some static/dynamic code on the
> kind of values you have.
>
> So, we need a fixed freq_table before cpufreq_driver->init is called. That's it.
>
> What you might end up doing could be unregister/register your cpufreq driver for
> every new freq_table you want to test your system with. And so your
> cpufreq_driver->init() can return these new tables everytime.
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