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drm/amdkfd: Fix debug unregister procedure on process termination 

Take the dbgmgr lock and unregister before destroying the debug manager.
Do this before destroying the queues.

v2: Correct locking order in kfd_ioctl_dbg_register to ake sure the
process mutex and dbgmgr mutex are always taken in the same order.

Signed-off-by: Yair Shachar <yair.shachar@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Yair Shachar 2017-11-01 19:21:29 -04:00 committed by Oded Gabbay
parent e2a8e99964
commit 062c5672d5
2 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -450,8 +450,8 @@ static int kfd_ioctl_dbg_register(struct file *filep,
return -EINVAL;
}
mutex_lock(kfd_get_dbgmgr_mutex());
mutex_lock(&p->mutex);
mutex_lock(kfd_get_dbgmgr_mutex());
/*
* make sure that we have pdd, if this the first queue created for
@ -479,8 +479,8 @@ static int kfd_ioctl_dbg_register(struct file *filep,
}
out:
mutex_unlock(&p->mutex);
mutex_unlock(kfd_get_dbgmgr_mutex());
mutex_unlock(&p->mutex);
return status;
}

37
drivers/gpu/drm/amd/amdkfd/kfd_process.c
View File

@ -224,17 +224,26 @@ static void kfd_process_notifier_release(struct mmu_notifier *mn,
mutex_lock(&p->mutex);
/* Iterate over all process device data structures and if the
* pdd is in debug mode, we should first force unregistration,
* then we will be able to destroy the queues
*/
list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
struct kfd_dev *dev = pdd->dev;
mutex_lock(kfd_get_dbgmgr_mutex());
if (dev && dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
kfd_dbgmgr_destroy(dev->dbgmgr);
dev->dbgmgr = NULL;
}
}
mutex_unlock(kfd_get_dbgmgr_mutex());
}
kfd_process_dequeue_from_all_devices(p);
pqm_uninit(&p->pqm);
/* Iterate over all process device data structure and check
* if we should delete debug managers
*/
list_for_each_entry(pdd, &p->per_device_data, per_device_list)
if ((pdd->dev->dbgmgr) &&
(pdd->dev->dbgmgr->pasid == p->pasid))
kfd_dbgmgr_destroy(pdd->dev->dbgmgr);
mutex_unlock(&p->mutex);
/*
@ -463,8 +472,16 @@ void kfd_process_iommu_unbind_callback(struct kfd_dev *dev, unsigned int pasid)
pr_debug("Unbinding process %d from IOMMU\n", pasid);
if ((dev->dbgmgr) && (dev->dbgmgr->pasid == p->pasid))
kfd_dbgmgr_destroy(dev->dbgmgr);
mutex_lock(kfd_get_dbgmgr_mutex());
if (dev->dbgmgr && dev->dbgmgr->pasid == p->pasid) {
if (!kfd_dbgmgr_unregister(dev->dbgmgr, p)) {
kfd_dbgmgr_destroy(dev->dbgmgr);
dev->dbgmgr = NULL;
}
}
mutex_unlock(kfd_get_dbgmgr_mutex());
pdd = kfd_get_process_device_data(dev, p);
if (pdd)