drm/amdkfd: process_info lock not needed for svm

process_info->lock is used to protect kfd_bo_list, vm_list_head, n_vms
and userptr valid/inval list, svm_range_restore_work and
svm_range_set_attr don't access those, so do not need to take
process_info lock. This will avoid potential circular locking issue.

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>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index dd4715c..3cb4681 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1574,7 +1574,6 @@ retry_flush_work:
 static void svm_range_restore_work(struct work_struct *work)
 {
        struct delayed_work *dwork = to_delayed_work(work);
-       struct amdkfd_process_info *process_info;
        struct svm_range_list *svms;
        struct svm_range *prange;
        struct kfd_process *p;
@@ -1594,12 +1593,10 @@ static void svm_range_restore_work(struct work_struct *work)
         * the lifetime of this thread, kfd_process and mm will be valid.
         */
        p = container_of(svms, struct kfd_process, svms);
-       process_info = p->kgd_process_info;
        mm = p->mm;
        if (!mm)
                return;
 
-       mutex_lock(&process_info->lock);
        svm_range_list_lock_and_flush_work(svms, mm);
        mutex_lock(&svms->lock);
 
@@ -1652,7 +1649,6 @@ static void svm_range_restore_work(struct work_struct *work)
 out_reschedule:
        mutex_unlock(&svms->lock);
        mmap_write_unlock(mm);
-       mutex_unlock(&process_info->lock);
 
        /* If validation failed, reschedule another attempt */
        if (evicted_ranges) {
@@ -3181,7 +3177,6 @@ static int
 svm_range_set_attr(struct kfd_process *p, uint64_t start, uint64_t size,
                   uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs)
 {
-       struct amdkfd_process_info *process_info = p->kgd_process_info;
        struct mm_struct *mm = current->mm;
        struct list_head update_list;
        struct list_head insert_list;
@@ -3200,8 +3195,6 @@ svm_range_set_attr(struct kfd_process *p, uint64_t start, uint64_t size,
 
        svms = &p->svms;
 
-       mutex_lock(&process_info->lock);
-
        svm_range_list_lock_and_flush_work(svms, mm);
 
        r = svm_range_is_valid(p, start, size);
@@ -3277,8 +3270,6 @@ out_unlock_range:
        mutex_unlock(&svms->lock);
        mmap_read_unlock(mm);
 out:
-       mutex_unlock(&process_info->lock);
-
        pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] done, r=%d\n", p->pasid,
                 &p->svms, start, start + size - 1, r);