Viresh Kumar 27c09484dd opp: Allocate the OPP table outside of opp_table_lock ... There is no critical section which needs protection with locks while allocating an OPP table, except while adding it to the opp_tables list. And taking the opp_table_lock for the entire duration causes circular dependency issues like the one mentioned below. This patch takes another approach to reduce the size of the critical section to avoid such issues, the details of that are present within the patch. ====================================================== WARNING: possible circular locking dependency detected 5.4.72 #14 Not tainted ------------------------------------------------------ chrome/1865 is trying to acquire lock: ffffffdd34921750 (opp_table_lock){+.+.}, at: _find_opp_table+0x34/0x74 but task is already holding lock: ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec fscrypt: AES-256-CTS-CBC using implementation "cts-cbc-aes-ce" which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (reservation_ww_class_mutex){+.+.}: __mutex_lock_common+0xec/0xc0c ww_mutex_lock_interruptible+0x5c/0xc4 msm_gem_fault+0x2c/0x124 __do_fault+0x40/0x16c handle_mm_fault+0x7cc/0xd98 do_page_fault+0x230/0x3b4 do_translation_fault+0x5c/0x78 do_mem_abort+0x4c/0xb4 el0_da+0x1c/0x20 -> #3 (&mm->mmap_sem){++++}: __might_fault+0x70/0x98 compat_filldir+0xf8/0x48c dcache_readdir+0x70/0x1dc iterate_dir+0xd4/0x180 __arm64_compat_sys_getdents+0xa0/0x19c el0_svc_common+0xa8/0x178 el0_svc_compat_handler+0x2c/0x40 el0_svc_compat+0x8/0x10 -> #2 (&sb->s_type->i_mutex_key#3){++++}: down_write+0x54/0x16c start_creating+0x68/0x128 debugfs_create_dir+0x28/0x114 opp_debug_register+0x8c/0xc0 _add_opp_dev_unlocked+0x5c/0x70 _add_opp_dev+0x38/0x58 _opp_get_opp_table+0xdc/0x1ac dev_pm_opp_get_opp_table_indexed+0x24/0x30 dev_pm_opp_of_add_table_indexed+0x48/0x84 of_genpd_add_provider_onecell+0xc0/0x1b8 rpmhpd_probe+0x240/0x268 platform_drv_probe+0x90/0xb0 really_probe+0x134/0x2ec driver_probe_device+0x64/0xfc __device_attach_driver+0x8c/0xa4 bus_for_each_drv+0x90/0xd8 __device_attach+0xc0/0x148 device_initial_probe+0x20/0x2c bus_probe_device+0x34/0x94 device_add+0x1fc/0x3b0 of_device_add+0x3c/0x4c of_platform_device_create_pdata+0xb8/0xfc of_platform_bus_create+0x1e4/0x368 of_platform_populate+0x70/0xbc devm_of_platform_populate+0x58/0xa0 rpmh_rsc_probe+0x36c/0x3cc platform_drv_probe+0x90/0xb0 really_probe+0x134/0x2ec driver_probe_device+0x64/0xfc __device_attach_driver+0x8c/0xa4 bus_for_each_drv+0x90/0xd8 __device_attach+0xc0/0x148 device_initial_probe+0x20/0x2c bus_probe_device+0x34/0x94 device_add+0x1fc/0x3b0 of_device_add+0x3c/0x4c of_platform_device_create_pdata+0xb8/0xfc of_platform_bus_create+0x1e4/0x368 of_platform_bus_create+0x230/0x368 of_platform_populate+0x70/0xbc of_platform_default_populate_init+0xa8/0xc0 do_one_initcall+0x1c8/0x3fc do_initcall_level+0xb4/0x10c do_basic_setup+0x30/0x48 kernel_init_freeable+0x124/0x1a4 kernel_init+0x14/0x104 ret_from_fork+0x10/0x18 -> #1 (&opp_table->lock){+.+.}: __mutex_lock_common+0xec/0xc0c mutex_lock_nested+0x40/0x50 _add_opp_dev+0x2c/0x58 _opp_get_opp_table+0xdc/0x1ac dev_pm_opp_get_opp_table_indexed+0x24/0x30 dev_pm_opp_of_add_table_indexed+0x48/0x84 of_genpd_add_provider_onecell+0xc0/0x1b8 rpmhpd_probe+0x240/0x268 platform_drv_probe+0x90/0xb0 really_probe+0x134/0x2ec driver_probe_device+0x64/0xfc __device_attach_driver+0x8c/0xa4 bus_for_each_drv+0x90/0xd8 __device_attach+0xc0/0x148 device_initial_probe+0x20/0x2c bus_probe_device+0x34/0x94 device_add+0x1fc/0x3b0 of_device_add+0x3c/0x4c of_platform_device_create_pdata+0xb8/0xfc of_platform_bus_create+0x1e4/0x368 of_platform_populate+0x70/0xbc devm_of_platform_populate+0x58/0xa0 rpmh_rsc_probe+0x36c/0x3cc platform_drv_probe+0x90/0xb0 really_probe+0x134/0x2ec driver_probe_device+0x64/0xfc __device_attach_driver+0x8c/0xa4 bus_for_each_drv+0x90/0xd8 __device_attach+0xc0/0x148 device_initial_probe+0x20/0x2c bus_probe_device+0x34/0x94 device_add+0x1fc/0x3b0 of_device_add+0x3c/0x4c of_platform_device_create_pdata+0xb8/0xfc of_platform_bus_create+0x1e4/0x368 of_platform_populate+0x70/0xbc devm_of_platform_populate+0x58/0xa0 rpmh_rsc_probe+0x36c/0x3cc platform_drv_probe+0x90/0xb0 really_probe+0x134/0x2ec driver_probe_device+0x64/0xfc __device_attach_driver+0x8c/0xa4 bus_for_each_drv+0x90/0xd8 __device_attach+0xc0/0x148 device_initial_probe+0x20/0x2c bus_probe_device+0x34/0x94 device_add+0x1fc/0x3b0 of_device_add+0x3c/0x4c of_platform_device_create_pdata+0xb8/0xfc of_platform_bus_create+0x1e4/0x368 of_platform_bus_create+0x230/0x368 of_platform_populate+0x70/0xbc of_platform_default_populate_init+0xa8/0xc0 do_one_initcall+0x1c8/0x3fc do_initcall_level+0xb4/0x10c do_basic_setup+0x30/0x48 kernel_init_freeable+0x124/0x1a4 kernel_init+0x14/0x104 ret_from_fork+0x10/0x18 -> #0 (opp_table_lock){+.+.}: __lock_acquire+0xee4/0x2450 lock_acquire+0x1cc/0x210 __mutex_lock_common+0xec/0xc0c mutex_lock_nested+0x40/0x50 _find_opp_table+0x34/0x74 dev_pm_opp_find_freq_exact+0x2c/0xdc a6xx_gmu_resume+0xc8/0xecc a6xx_pm_resume+0x148/0x200 adreno_resume+0x28/0x34 pm_generic_runtime_resume+0x34/0x48 __rpm_callback+0x70/0x10c rpm_callback+0x34/0x8c rpm_resume+0x414/0x550 __pm_runtime_resume+0x7c/0xa0 msm_gpu_submit+0x60/0x1c0 msm_ioctl_gem_submit+0xadc/0xb60 drm_ioctl_kernel+0x9c/0x118 drm_ioctl+0x27c/0x408 drm_compat_ioctl+0xcc/0xdc __se_compat_sys_ioctl+0x100/0x206c __arm64_compat_sys_ioctl+0x20/0x2c el0_svc_common+0xa8/0x178 el0_svc_compat_handler+0x2c/0x40 el0_svc_compat+0x8/0x10 other info that might help us debug this: Chain exists of: opp_table_lock --> &mm->mmap_sem --> reservation_ww_class_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(reservation_ww_class_mutex); lock(&mm->mmap_sem); lock(reservation_ww_class_mutex); lock(opp_table_lock); *** DEADLOCK *** 3 locks held by chrome/1865: #0: ffffff81edecc0d8 (&dev->struct_mutex){+.+.}, at: msm_ioctl_gem_submit+0x264/0xb60 #1: ffffff81d0000870 (reservation_ww_class_acquire){+.+.}, at: msm_ioctl_gem_submit+0x8e8/0xb60 #2: ffffff81f0fc71a8 (reservation_ww_class_mutex){+.+.}, at: submit_lock_objects+0x70/0x1ec stack backtrace: CPU: 0 PID: 1865 Comm: chrome Not tainted 5.4.72 #14 Hardware name: Google Lazor (rev1+) with LTE (DT) Call trace: dump_backtrace+0x0/0x158 show_stack+0x20/0x2c dump_stack+0xc8/0x160 print_circular_bug+0x2c4/0x2c8 check_noncircular+0x1a8/0x1b0 __lock_acquire+0xee4/0x2450 lock_acquire+0x1cc/0x210 __mutex_lock_common+0xec/0xc0c mutex_lock_nested+0x40/0x50 _find_opp_table+0x34/0x74 dev_pm_opp_find_freq_exact+0x2c/0xdc a6xx_gmu_resume+0xc8/0xecc a6xx_pm_resume+0x148/0x200 adreno_resume+0x28/0x34 pm_generic_runtime_resume+0x34/0x48 __rpm_callback+0x70/0x10c rpm_callback+0x34/0x8c rpm_resume+0x414/0x550 __pm_runtime_resume+0x7c/0xa0 msm_gpu_submit+0x60/0x1c0 msm_ioctl_gem_submit+0xadc/0xb60 drm_ioctl_kernel+0x9c/0x118 drm_ioctl+0x27c/0x408 drm_compat_ioctl+0xcc/0xdc __se_compat_sys_ioctl+0x100/0x206c __arm64_compat_sys_ioctl+0x20/0x2c el0_svc_common+0xa8/0x178 el0_svc_compat_handler+0x2c/0x40 el0_svc_compat+0x8/0x10 Reported-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>		2020-11-06 12:50:02 +05:30
..
core.c	opp: Allocate the OPP table outside of opp_table_lock	2020-11-06 12:50:02 +05:30
cpu.c	opp: Remove _dev_pm_opp_find_and_remove_table() wrapper	2020-08-24 17:04:37 +05:30
debugfs.c	opp: Expose bandwidth information via debugfs	2020-05-29 10:15:12 +05:30
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
of.c	opp: Allocate the OPP table outside of opp_table_lock	2020-11-06 12:50:02 +05:30
opp.h	Merge branch 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm	2020-10-05 13:31:32 +02:00
ti-opp-supply.c	opp: ti-opp-supply: Replace HTTP links with HTTPS ones	2020-07-24 08:05:54 +05:30