diff options
| author | Mukul Joshi <mukul.joshi@amd.com> | 2022-05-31 14:39:36 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-06-09 09:45:35 -0400 |
| commit | fe1f05df5919c67c3add49efb55e251a8d78ee4e (patch) | |
| tree | 1653079f117524d35dbe49328a94cbb3e933bd5d /drivers/gpu/drm/amd/amdkfd/kfd_process.c | |
| parent | 6b22ef25748fb77030bac02e2147f6d738212ac3 (diff) | |
drm/amdkfd: Rework kfd_locked handling
Currently, even if kfd_locked is set, a process is first
created and then removed to work around a race condition
in updating kfd_locked flag. Rework kfd_locked handling to
ensure no processes is created if kfd_locked is set. This
is achieved by updating kfd_locked under kfd_processes_mutex.
With this there is no need for kfd_locked to be an atomic
counter. Instead, it can be a regular integer.
Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_process.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index 9b1e84d33cdc..c3d43e6e5236 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -50,7 +50,7 @@ struct mm_struct; * Unique/indexed by mm_struct* */ DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE); -static DEFINE_MUTEX(kfd_processes_mutex); +DEFINE_MUTEX(kfd_processes_mutex); DEFINE_SRCU(kfd_processes_srcu); @@ -818,6 +818,12 @@ struct kfd_process *kfd_create_process(struct file *filep) */ mutex_lock(&kfd_processes_mutex); + if (kfd_is_locked()) { + mutex_unlock(&kfd_processes_mutex); + pr_debug("KFD is locked! Cannot create process"); + return ERR_PTR(-EINVAL); + } + /* A prior open of /dev/kfd could have already created the process. */ process = find_process(thread, false); if (process) { |