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3 Commits

Author SHA1 Message Date
Pengjie Zhang
26dd44a400 PM / devfreq: hisi: Fix potential UAF in OPP handling 
Ensure all required data is acquired before calling dev_pm_opp_put(opp)
to maintain correct resource acquisition and release order.

Fixes: 7da2fdaaa1 ("PM / devfreq: Add HiSilicon uncore frequency scaling driver")
Signed-off-by: Pengjie Zhang <zhangpengjie2@huawei.com>
Reviewed-by: Jie Zhan <zhanjie9@hisilicon.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://patchwork.kernel.org/project/linux-pm/patch/20250915062135.748653-1-zhangpengjie2@huawei.com/
 2025-11-24 00:02:07 +09:00
Dmitry Baryshkov
447c4e8338 PM / devfreq: Move governor.h to a public header location 
Some device drivers (and out-of-tree modules) might want to define
device-specific device governors. Rather than restricting all of them to
be a part of drivers/devfreq/ (which is not possible for out-of-tree
drivers anyway) move governor.h to include/linux/devfreq-governor.h and
update all drivers to use it.

The devfreq_cpu_data is only used internally, by the passive governor,
so it is moved to the driver source rather than being a part of the
public interface.

Reported-by: Robie Basak <robibasa@qti.qualcomm.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://patchwork.kernel.org/project/linux-pm/patch/20251030-governor-public-v2-1-432a11a9975a@oss.qualcomm.com/
 2025-11-24 00:02:01 +09:00
Jie Zhan
7da2fdaaa1 PM / devfreq: Add HiSilicon uncore frequency scaling driver 
Add the HiSilicon uncore frequency scaling driver for Kunpeng SoCs based on
the devfreq framework.  The uncore domain contains shared computing
resources, including system interconnects and L3 cache.  The uncore
frequency significantly impacts the system-wide performance as well as
power consumption.  This driver adds support for runtime management of
uncore frequency from kernel and userspace.  The main function includes
setting and getting frequencies, changing frequency scaling policies, and
querying the list of CPUs whose performance is significantly related to
this uncore frequency domain, etc.  The driver communicates with a platform
controller through an ACPI PCC mailbox to take the actual actions of
frequency scaling.

Co-developed-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Jie Zhan <zhanjie9@hisilicon.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://patchwork.kernel.org/project/linux-pm/patch/20250623143401.4095045-3-zhanjie9@hisilicon.com/
 2025-07-14 20:23:57 +09:00