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| author | Changwoo Min <changwoo@igalia.com> | 2025-10-21 01:09:05 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-10-22 22:44:37 +0300 |
| commit | cbe5aeedecc72314c3a8fd0d41d9b270f576aee1 (patch) | |
| tree | a117759a2c8c1082ab89d8204ddbe5c38023beb7 /include | |
| parent | 211ddde0823f1442e4ad052a2f30f050145ccada (diff) | |
| download | linux-cbe5aeedecc72314c3a8fd0d41d9b270f576aee1.tar.xz | |
PM: EM: Assign a unique ID when creating a performance domain
It is necessary to refer to a specific performance domain from a
userspace. For example, the energy model of a particular performance
domain is updated.
To this end, assign a unique ID to each performance domain to address it,
and manage them in a global linked list to look up a specific one by
matching ID. IDA is used for ID assignment, and the mutex is used to
protect the global list from concurrent access.
Note that the mutex (em_pd_list_mutex) is not supposed to hold while
holding em_pd_mutex to avoid ABBA deadlock.
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-2-changwoo@igalia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/energy_model.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 61d50571ad88..43aa6153dc57 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -54,6 +54,8 @@ struct em_perf_table { /** * struct em_perf_domain - Performance domain * @em_table: Pointer to the runtime modifiable em_perf_table + * @node: node in em_pd_list (in energy_model.c) + * @id: A unique ID number for each performance domain * @nr_perf_states: Number of performance states * @min_perf_state: Minimum allowed Performance State index * @max_perf_state: Maximum allowed Performance State index @@ -71,6 +73,8 @@ struct em_perf_table { */ struct em_perf_domain { struct em_perf_table __rcu *em_table; + struct list_head node; + int id; int nr_perf_states; int min_perf_state; int max_perf_state; |