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Subject[PATCH 26/83] hsa/radeon: Make binding of process to device permanent
Date
From: Andrew Lewycky <Andrew.Lewycky@amd.com>

Permanently bind the process to the device.
The binding survives even when all queues are destroyed.
Process exit and device removal terminate the binding.

Signed-off-by: Andrew Lewycky <Andrew.Lewycky@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
---
drivers/gpu/hsa/radeon/kfd_chardev.c | 27 +++------------------------
drivers/gpu/hsa/radeon/kfd_priv.h | 3 ---
drivers/gpu/hsa/radeon/kfd_process.c | 21 ++++++++++-----------
3 files changed, 13 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/hsa/radeon/kfd_chardev.c b/drivers/gpu/hsa/radeon/kfd_chardev.c
index 4e7d5d0..e0b276d 100644
--- a/drivers/gpu/hsa/radeon/kfd_chardev.c
+++ b/drivers/gpu/hsa/radeon/kfd_chardev.c
@@ -141,20 +141,13 @@ kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p, void __user *a
pdd = radeon_kfd_bind_process_to_device(dev, p);
if (IS_ERR(pdd) < 0) {
err = PTR_ERR(pdd);
- goto err_bind_pasid;
+ goto err_bind_process;
}

- pr_debug("kfd: creating queue number %d for PASID %d on GPU 0x%x\n",
- pdd->queue_count,
+ pr_debug("kfd: creating queue for PASID %d on GPU 0x%x\n",
p->pasid,
dev->id);

- if (pdd->queue_count++ == 0) {
- err = dev->device_info->scheduler_class->register_process(dev->scheduler, p, &pdd->scheduler_process);
- if (err < 0)
- goto err_register_process;
- }
-
if (!radeon_kfd_allocate_queue_id(p, &queue_id))
goto err_allocate_queue_id;

@@ -198,12 +191,7 @@ err_copy_args_out:
err_create_queue:
radeon_kfd_remove_queue(p, queue_id);
err_allocate_queue_id:
- if (--pdd->queue_count == 0) {
- dev->device_info->scheduler_class->deregister_process(dev->scheduler, pdd->scheduler_process);
- pdd->scheduler_process = NULL;
- }
-err_register_process:
-err_bind_pasid:
+err_bind_process:
kfree(queue);
mutex_unlock(&p->mutex);
return err;
@@ -215,7 +203,6 @@ kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p, void __user *a
struct kfd_ioctl_destroy_queue_args args;
struct kfd_queue *queue;
struct kfd_dev *dev;
- struct kfd_process_device *pdd;

if (copy_from_user(&args, arg, sizeof(args)))
return -EFAULT;
@@ -239,14 +226,6 @@ kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p, void __user *a

kfree(queue);

- pdd = radeon_kfd_get_process_device_data(dev, p);
- BUG_ON(pdd == NULL); /* Because a queue exists. */
-
- if (--pdd->queue_count == 0) {
- dev->device_info->scheduler_class->deregister_process(dev->scheduler, pdd->scheduler_process);
- pdd->scheduler_process = NULL;
- }
-
mutex_unlock(&p->mutex);
return 0;
}
diff --git a/drivers/gpu/hsa/radeon/kfd_priv.h b/drivers/gpu/hsa/radeon/kfd_priv.h
index 630d690..bca9cce 100644
--- a/drivers/gpu/hsa/radeon/kfd_priv.h
+++ b/drivers/gpu/hsa/radeon/kfd_priv.h
@@ -166,9 +166,6 @@ struct kfd_process_device {
/* The user-mode address of the doorbell mapping for this device. */
doorbell_t __user *doorbell_mapping;

- /* The number of queues created by this process for this device. */
- uint32_t queue_count;
-
/* Scheduler process data for this device. */
struct kfd_scheduler_process *scheduler_process;

diff --git a/drivers/gpu/hsa/radeon/kfd_process.c b/drivers/gpu/hsa/radeon/kfd_process.c
index 145ee38..f89f855 100644
--- a/drivers/gpu/hsa/radeon/kfd_process.c
+++ b/drivers/gpu/hsa/radeon/kfd_process.c
@@ -120,15 +120,6 @@ destroy_queues(struct kfd_process *p, struct kfd_dev *dev_filter)
dev->device_info->scheduler_class->destroy_queue(dev->scheduler, &queue->scheduler_queue);

kfree(queue);
-
- BUG_ON(pdd->queue_count == 0);
- BUG_ON(pdd->scheduler_process == NULL);
-
- if (--pdd->queue_count == 0) {
- dev->device_info->scheduler_class->deregister_process(dev->scheduler,
- pdd->scheduler_process);
- pdd->scheduler_process = NULL;
- }
}
}
}
@@ -144,6 +135,8 @@ static void free_process(struct kfd_process *p)
/* doorbell mappings: automatic */

list_for_each_entry_safe(pdd, temp, &p->per_device_data, per_device_list) {
+ pdd->dev->device_info->scheduler_class->deregister_process(pdd->dev->scheduler, pdd->scheduler_process);
+ pdd->scheduler_process = NULL;
amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
list_del(&pdd->per_device_list);
kfree(pdd);
@@ -255,6 +248,12 @@ struct kfd_process_device *radeon_kfd_bind_process_to_device(struct kfd_dev *dev
if (err < 0)
return ERR_PTR(err);

+ err = dev->device_info->scheduler_class->register_process(dev->scheduler, p, &pdd->scheduler_process);
+ if (err < 0) {
+ amd_iommu_unbind_pasid(dev->pdev, p->pasid);
+ return ERR_PTR(err);
+ }
+
pdd->bound = true;

return pdd;
@@ -285,8 +284,8 @@ void radeon_kfd_unbind_process_from_device(struct kfd_dev *dev, pasid_t pasid)

destroy_queues(p, dev);

- /* All queues just got destroyed so this should be gone. */
- BUG_ON(pdd->scheduler_process != NULL);
+ dev->device_info->scheduler_class->deregister_process(dev->scheduler, pdd->scheduler_process);
+ pdd->scheduler_process = NULL;

/*
* Just mark pdd as unbound, because we still need it to call
--
1.9.1


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