From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
To: linuxppc-dev@ozlabs.org
Cc: srivatsa.bhat@linux.vnet.ibm.com,
"Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Subject: [PATCH v2 4/6] powernv:cpufreq: Create pstate_id_to_freq() helper
Date: Mon, 10 Mar 2014 16:40:59 +0530 [thread overview]
Message-ID: <1394449861-8688-5-git-send-email-ego@linux.vnet.ibm.com> (raw)
In-Reply-To: <1394449861-8688-1-git-send-email-ego@linux.vnet.ibm.com>
From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Create a helper routine that can return the cpu-frequency for the
corresponding pstate_id.
Also, cache the values of the pstate_max, pstate_min and
pstate_nominal and nr_pstates in a static structure so that they can
be reused in the future to perform any validations.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
---
drivers/cpufreq/powernv-cpufreq.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 4c2e8ca..0ecd163 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -39,6 +39,14 @@ static DEFINE_PER_CPU(struct mutex, freq_switch_lock);
static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
static int powernv_pstate_ids[POWERNV_MAX_PSTATES+1];
+struct powernv_pstate_info {
+ int pstate_min_id;
+ int pstate_max_id;
+ int pstate_nominal_id;
+ int nr_pstates;
+};
+static struct powernv_pstate_info powernv_pstate_info;
+
/*
* Initialize the freq table based on data obtained
* from the firmware passed via device-tree
@@ -112,9 +120,28 @@ static int init_powernv_pstates(void)
for (i = 0; powernv_freqs[i].frequency != CPUFREQ_TABLE_END; i++)
pr_debug("%d: %d\n", i, powernv_freqs[i].frequency);
+ powernv_pstate_info.pstate_min_id = pstate_min;
+ powernv_pstate_info.pstate_max_id = pstate_max;
+ powernv_pstate_info.pstate_nominal_id = pstate_nominal;
+ powernv_pstate_info.nr_pstates = nr_pstates;
+
return 0;
}
+/**
+ * Returns the cpu frequency corresponding to the pstate_id.
+ */
+static unsigned int pstate_id_to_freq(int pstate_id)
+{
+ int i;
+
+ i = powernv_pstate_info.pstate_max_id - pstate_id;
+
+ BUG_ON(i >= powernv_pstate_info.nr_pstates || i < 0);
+ WARN_ON(powernv_pstate_ids[i] != pstate_id);
+ return powernv_freqs[i].frequency;
+}
+
static struct freq_attr *powernv_cpu_freq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
--
1.8.3.1
next prev parent reply other threads:[~2014-03-10 11:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 11:10 [PATCH v2 0/6] powernv:cpufreq: Dynamic cpu-frequency scaling Gautham R. Shenoy
2014-03-10 11:10 ` [PATCH v2 1/6] powernv: cpufreq driver for powernv platform Gautham R. Shenoy
2014-03-10 11:10 ` [PATCH v2 2/6] powernv:cpufreq: Create a powernv_cpu_to_core_mask() helper Gautham R. Shenoy
2014-03-18 23:37 ` Benjamin Herrenschmidt
2014-03-19 6:35 ` Srivatsa S. Bhat
2014-03-19 11:02 ` Gautham R Shenoy
2014-03-10 11:10 ` [PATCH v2 3/6] powernv, cpufreq:Add per-core locking to serialize frequency transitions Gautham R. Shenoy
2014-03-17 9:04 ` Preeti U Murthy
2014-03-10 11:10 ` Gautham R. Shenoy [this message]
2014-03-17 9:06 ` [PATCH v2 4/6] powernv:cpufreq: Create pstate_id_to_freq() helper Preeti U Murthy
2014-03-10 11:11 ` [PATCH v2 5/6] powernv:cpufreq: Export nominal frequency via sysfs Gautham R. Shenoy
2014-03-10 11:11 ` [PATCH v2 6/6] powernv:cpufreq: Implement the driver->get() method Gautham R. Shenoy
2014-03-17 9:11 ` Preeti U Murthy
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