From: Lukasz Luba <lukasz.luba@arm.com>
To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
rafael@kernel.org
Cc: lukasz.luba@arm.com, dietmar.eggemann@arm.com,
rui.zhang@intel.com, amit.kucheria@verdurent.com,
amit.kachhap@gmail.com, daniel.lezcano@linaro.org,
viresh.kumar@linaro.org, len.brown@intel.com, pavel@ucw.cz,
Pierre.Gondois@arm.com, ionela.voinescu@arm.com,
mhiramat@kernel.org
Subject: [PATCH v3 05/12] PM: EM: Check if the get_cost() callback is present in em_compute_costs()
Date: Fri, 21 Jul 2023 16:50:15 +0100 [thread overview]
Message-ID: <20230721155022.2339982-6-lukasz.luba@arm.com> (raw)
In-Reply-To: <20230721155022.2339982-1-lukasz.luba@arm.com>
The em_compute_cost() is going to be re-used in runtime modified EM
code path. Thus, make sure that this common code is safe and won't
try to use the NULL pointer. The former em_compute_cost() didn't have to
care about runtime modification code path. The upcoming changes introduce
such option, but with different callback. Those two paths which use
get_cost() (during first EM registration) or update_power() (during
runtime modification) need to be safely handled in em_compute_costs().
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
kernel/power/energy_model.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index fd1066dcf38b..5ecb73b36995 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -116,7 +116,7 @@ static int em_compute_costs(struct device *dev, struct em_perf_state *table,
for (i = nr_states - 1; i >= 0; i--) {
unsigned long power_res, cost;
- if (flags & EM_PERF_DOMAIN_ARTIFICIAL) {
+ if (flags & EM_PERF_DOMAIN_ARTIFICIAL && cb->get_cost) {
ret = cb->get_cost(dev, table[i].frequency, &cost);
if (ret || !cost || cost > EM_MAX_POWER) {
dev_err(dev, "EM: invalid cost %lu %d\n",
--
2.25.1
next prev parent reply other threads:[~2023-07-21 15:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-21 15:50 [PATCH v3 00/12] Introduce runtime modifiable Energy Model Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 01/12] PM: EM: Refactor em_cpufreq_update_efficiencies() arguments Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 02/12] PM: EM: Find first CPU online while updating OPP efficiency Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 03/12] PM: EM: Refactor em_pd_get_efficient_state() to be more flexible Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 04/12] PM: EM: Refactor a new function em_compute_costs() Lukasz Luba
2023-07-21 15:50 ` Lukasz Luba [this message]
2023-07-21 15:50 ` [PATCH v3 06/12] PM: EM: Refactor struct em_perf_domain and add default_table Lukasz Luba
2023-08-16 13:04 ` Dietmar Eggemann
2023-08-21 15:22 ` Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 07/12] PM: EM: Add update_power() callback for runtime modifications Lukasz Luba
2023-08-16 13:04 ` Dietmar Eggemann
2023-08-21 15:23 ` Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 08/12] PM: EM: Introduce runtime modifiable table Lukasz Luba
2023-08-16 13:05 ` Dietmar Eggemann
2023-08-21 15:25 ` Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 09/12] PM: EM: Add RCU mechanism which safely cleans the old data Lukasz Luba
2023-08-16 13:06 ` Dietmar Eggemann
2023-08-21 15:30 ` Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 10/12] PM: EM: Add runtime update interface to modify EM power Lukasz Luba
2023-08-16 13:07 ` Dietmar Eggemann
2023-08-21 15:33 ` Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 11/12] PM: EM: Use runtime modified EM for CPUs energy estimation in EAS Lukasz Luba
2023-07-21 15:50 ` [PATCH v3 12/12] Documentation: EM: Update with runtime modification design Lukasz Luba
2023-08-16 13:08 ` Dietmar Eggemann
2023-08-21 16:13 ` Lukasz Luba
2023-08-16 13:00 ` [PATCH v3 00/12] Introduce runtime modifiable Energy Model Dietmar Eggemann
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