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Stephan Gerhold ae2015b0db drm/msm/gpu: Fix crash when throttling GPU immediately during boot 
commit b71717735b upstream.

There is a small chance that the GPU is already hot during boot. In that
case, the call to of_devfreq_cooling_register() will immediately try to
apply devfreq cooling, as seen in the following crash:

  Unable to handle kernel paging request at virtual address 0000000000014110
  pc : a6xx_gpu_busy+0x1c/0x58 [msm]
  lr : msm_devfreq_get_dev_status+0xbc/0x140 [msm]
  Call trace:
   a6xx_gpu_busy+0x1c/0x58 [msm] (P)
   devfreq_simple_ondemand_func+0x3c/0x150
   devfreq_update_target+0x44/0xd8
   qos_max_notifier_call+0x30/0x84
   blocking_notifier_call_chain+0x6c/0xa0
   pm_qos_update_target+0xd0/0x110
   freq_qos_apply+0x3c/0x74
   apply_constraint+0x88/0x148
   __dev_pm_qos_update_request+0x7c/0xcc
   dev_pm_qos_update_request+0x38/0x5c
   devfreq_cooling_set_cur_state+0x98/0xf0
   __thermal_cdev_update+0x64/0xb4
   thermal_cdev_update+0x4c/0x58
   step_wise_manage+0x1f0/0x318
   __thermal_zone_device_update+0x278/0x424
   __thermal_cooling_device_register+0x2bc/0x308
   thermal_of_cooling_device_register+0x10/0x1c
   of_devfreq_cooling_register_power+0x240/0x2bc
   of_devfreq_cooling_register+0x14/0x20
   msm_devfreq_init+0xc4/0x1a0 [msm]
   msm_gpu_init+0x304/0x574 [msm]
   adreno_gpu_init+0x1c4/0x2e0 [msm]
   a6xx_gpu_init+0x5c8/0x9c8 [msm]
   adreno_bind+0x2a8/0x33c [msm]
   ...

At this point we haven't initialized the GMU at all yet, so we cannot read
the GMU registers inside a6xx_gpu_busy(). A similar issue was fixed before
in commit 6694482a70 ("drm/msm: Avoid unclocked GMU register access in
6xx gpu_busy"): msm_devfreq_init() does call devfreq_suspend_device(), but
unlike msm_devfreq_suspend(), it doesn't set the df->suspended flag
accordingly. This means the df->suspended flag does not match the actual
devfreq state after initialization and msm_devfreq_get_dev_status() will
end up accessing GMU registers, causing the crash.

Fix this by setting df->suspended correctly during initialization.

Cc: stable@vger.kernel.org
Fixes: 6694482a70 ("drm/msm: Avoid unclocked GMU register access in 6xx gpu_busy")
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/650772/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-07-06 10:58:02 +02:00
arch um: ubd: Add missing error check in start_io_thread() 2025-07-06 10:58:00 +02:00
block scsi: sd_zbc: block: Respect bio vector limits for REPORT ZONES buffer 2025-05-22 14:10:06 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:44:04 +02:00
crypto crypto: xts - Only add ecb if it is not already there 2025-06-27 11:07:06 +01:00
Documentation dt-bindings: serial: 8250: Make clocks and clock-frequency exclusive 2025-07-06 10:58:01 +02:00
drivers drm/msm/gpu: Fix crash when throttling GPU immediately during boot 2025-07-06 10:58:02 +02:00
fs btrfs: update superblock's device bytes_used when dropping chunk 2025-07-06 10:58:01 +02:00
include vsock/uapi: fix linux/vm_sockets.h userspace compilation errors 2025-07-06 10:58:00 +02:00
init sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP 2025-05-02 07:47:04 +02:00
io_uring io_uring: account drain memory to cgroup 2025-06-27 11:07:26 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:07:30 +01:00
kernel perf: Fix sample vs do_exit() 2025-06-27 11:07:41 +01:00
lib pldmfw: Select CRC32 when PLDMFW is selected 2025-06-27 11:07:39 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/huge_memory: fix dereferencing invalid pmd migration entry 2025-06-27 11:07:38 +01:00
net Bluetooth: L2CAP: Fix L2CAP MTU negotiation 2025-07-06 10:58:01 +02:00
rust rust: module: place cleanup_module() in .exit.text section 2025-07-06 10:57:54 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-06-04 14:40:02 +02:00
scripts kbuild: Add KBUILD_CPPFLAGS to as-option invocation 2025-06-27 11:07:24 +01:00
security selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len 2025-06-27 11:07:37 +01:00
sound ALSA: hda/realtek: Fix built-in mic on ASUS VivoBook X507UAR 2025-07-06 10:58:00 +02:00
tools libbpf: Fix null pointer dereference in btf_dump__free on allocation failure 2025-07-06 10:58:00 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:07:25 +01:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:21:15 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS sign-file,extract-cert: move common SSL helper functions to a header 2025-04-25 10:44:04 +02:00
Makefile Linux 6.1.142 2025-06-27 11:07:41 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.