diff mbox series

[v3,3/4] PM: EM: Add em_dev_update_chip_binning()

Message ID 20240328085112.3873050-4-lukasz.luba@arm.com (mailing list archive)
State Superseded, archived
Headers show
Series Update Energy Model after chip binning adjusted voltages | expand

Commit Message

Lukasz Luba March 28, 2024, 8:51 a.m. UTC
Add a function which allows to modify easily the EM after the new voltage
information is available. The device drivers for the chip can adjust
the voltage values after setup. The voltage for the same frequency in OPP
can be different due to chip binning. The voltage impacts the power usage
and the EM power values can be updated to reflect that.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
 include/linux/energy_model.h |  5 ++++
 kernel/power/energy_model.c  | 48 ++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

Comments

kernel test robot March 29, 2024, 8:20 a.m. UTC | #1
Hi Lukasz,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on krzk/for-next clk/clk-next linus/master v6.9-rc1 next-20240328]
[cannot apply to soc/for-next rafael-pm/acpi-bus rafael-pm/devprop]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lukasz-Luba/OPP-OF-Export-dev_opp_pm_calc_power-for-usage-from-EM/20240328-165357
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20240328085112.3873050-4-lukasz.luba%40arm.com
patch subject: [PATCH v3 3/4] PM: EM: Add em_dev_update_chip_binning()
config: i386-buildonly-randconfig-002-20240328 (https://download.01.org/0day-ci/archive/20240329/202403291602.UyrrrpzO-lkp@intel.com/config)
compiler: gcc-12 (Ubuntu 12.3.0-9ubuntu2) 12.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240329/202403291602.UyrrrpzO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403291602.UyrrrpzO-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/power/energy_model.c:814: warning: bad line:                                 information is present in the OPPs.


vim +814 kernel/power/energy_model.c

   811	
   812	/**
   813	 * em_dev_update_chip_binning() - Update Energy Model after the new voltage
 > 814					information is present in the OPPs.
diff mbox series

Patch

diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index 770755df852f1..d30d67c2f07cf 100644
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h
@@ -172,6 +172,7 @@  struct em_perf_table __rcu *em_table_alloc(struct em_perf_domain *pd);
 void em_table_free(struct em_perf_table __rcu *table);
 int em_dev_compute_costs(struct device *dev, struct em_perf_state *table,
 			 int nr_states);
+int em_dev_update_chip_binning(struct device *dev);
 
 /**
  * em_pd_get_efficient_state() - Get an efficient performance state from the EM
@@ -387,6 +388,10 @@  int em_dev_compute_costs(struct device *dev, struct em_perf_state *table,
 {
 	return -EINVAL;
 }
+static inline int em_dev_update_chip_binning(struct device *dev)
+{
+	return -EINVAL;
+}
 #endif
 
 #endif
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 6960dd7393b2d..e284aa335b6d0 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -808,3 +808,51 @@  static void em_update_workfn(struct work_struct *work)
 {
 	em_check_capacity_update();
 }
+
+/**
+ * em_dev_update_chip_binning() - Update Energy Model after the new voltage
+				information is present in the OPPs.
+ * @dev		: Device for which the Energy Model has to be updated.
+ *
+ * This function allows to update easily the EM with new values available in
+ * the OPP framework and DT. It can be used after the chip has been properly
+ * verified by device drivers and the voltages adjusted for the 'chip binning'.
+ */
+int em_dev_update_chip_binning(struct device *dev)
+{
+	struct em_perf_table __rcu *em_table;
+	struct em_perf_domain *pd;
+	int i, ret;
+
+	if (IS_ERR_OR_NULL(dev))
+		return -EINVAL;
+
+	pd = em_pd_get(dev);
+	if (!pd) {
+		dev_warn(dev, "Couldn't find Energy Model\n");
+		return -EINVAL;
+	}
+
+	em_table = em_table_dup(pd);
+	if (!em_table) {
+		dev_warn(dev, "EM: allocation failed\n");
+		return -ENOMEM;
+	}
+
+	/* Update power values which might change due to new voltage in OPPs */
+	for (i = 0; i < pd->nr_perf_states; i++) {
+		unsigned long freq = em_table->state[i].frequency;
+		unsigned long power;
+
+		ret = dev_pm_opp_calc_power(dev, &power, &freq);
+		if (ret) {
+			em_table_free(em_table);
+			return ret;
+		}
+
+		em_table->state[i].power = power;
+	}
+
+	return em_recalc_and_update(dev, pd, em_table);
+}
+EXPORT_SYMBOL_GPL(em_dev_update_chip_binning);