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74097f9fd2
Move process queues cleanup to deferred work kfd_process_wq_release, to
avoid potential deadlock circular locking warning:
WARNING: possible circular locking dependency detected
the existing dependency chain (in reverse order) is:
-> #2
((work_completion)(&svms->deferred_list_work)){+.+.}-{0:0}:
__flush_work+0x343/0x4a0
svm_range_list_lock_and_flush_work+0x39/0xc0
svm_range_set_attr+0xe8/0x1080 [amdgpu]
kfd_ioctl+0x19b/0x600 [amdgpu]
__x64_sys_ioctl+0x81/0xb0
do_syscall_64+0x34/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #1 (&info->lock#2){+.+.}-{3:3}:
__mutex_lock+0xa4/0x940
amdgpu_amdkfd_gpuvm_acquire_process_vm+0x2e3/0x590
kfd_process_device_init_vm+0x61/0x200 [amdgpu]
kfd_ioctl_acquire_vm+0x83/0xb0 [amdgpu]
kfd_ioctl+0x19b/0x600 [amdgpu]
__x64_sys_ioctl+0x81/0xb0
do_syscall_64+0x34/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #0 (&process->mutex){+.+.}-{3:3}:
__lock_acquire+0x1365/0x23d0
lock_acquire+0xc9/0x2e0
__mutex_lock+0xa4/0x940
kfd_process_notifier_release+0x96/0xe0 [amdgpu]
__mmu_notifier_release+0x94/0x210
exit_mmap+0x35/0x1f0
mmput+0x63/0x120
svm_range_deferred_list_work+0x177/0x2c0 [amdgpu]
process_one_work+0x2a4/0x600
worker_thread+0x39/0x3e0
kthread+0x16d/0x1a0
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock((work_completion)(&svms->deferred_list_work));
lock(&info->lock#2);
lock((work_completion)(&svms->deferred_list_work));
lock(&process->mutex);
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.