From: Yong Zhao <yong.zhao@amd.com>
Date: Wed, 20 Sep 2017 18:10:14 -0400
Subject: drm/amdkfd: Fix suspend/resume issue on Carrizo v2
Git-commit: 733fa1f7428c362b17b3de3a1c691e21fa803239
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
When we do suspend/resume through "sudo pm-suspend" while there is
HSA activity running, upon resume we will encounter HWS hanging, which
is caused by memory read/write failures. The root cause is that when
suspend, we neglected to unbind pasid from kfd device.
Another major change is that the bind/unbinding is changed to be
performed on a per process basis, instead of whether there are queues
in dqm.
v2:
- free IOMMU device if kfd_bind_processes_to_device fails in kfd_resume
- add comments to kfd_bind/unbind_processes_to/from_device
- minor cleanups
Signed-off-by: Yong Zhao <yong.zhao@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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_device.c | 23 ++--
drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 13 --
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 15 ++
drivers/gpu/drm/amd/amdkfd/kfd_process.c | 97 +++++++++++++++---
4 files changed, 109 insertions(+), 39 deletions(-)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -184,7 +184,7 @@ static void iommu_pasid_shutdown_callbac
struct kfd_dev *dev = kfd_device_by_pci_dev(pdev);
if (dev)
- kfd_unbind_process_from_device(dev, pasid);
+ kfd_process_iommu_unbind_callback(dev, pasid);
}
/*
@@ -332,12 +332,16 @@ void kgd2kfd_device_exit(struct kfd_dev
void kgd2kfd_suspend(struct kfd_dev *kfd)
{
- if (kfd->init_complete) {
- kfd->dqm->ops.stop(kfd->dqm);
- amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
- amd_iommu_set_invalid_ppr_cb(kfd->pdev, NULL);
- amd_iommu_free_device(kfd->pdev);
- }
+ if (!kfd->init_complete)
+ return;
+
+ kfd->dqm->ops.stop(kfd->dqm);
+
+ kfd_unbind_processes_from_device(kfd);
+
+ amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
+ amd_iommu_set_invalid_ppr_cb(kfd->pdev, NULL);
+ amd_iommu_free_device(kfd->pdev);
}
int kgd2kfd_resume(struct kfd_dev *kfd)
@@ -362,6 +366,10 @@ static int kfd_resume(struct kfd_dev *kf
amd_iommu_set_invalid_ppr_cb(kfd->pdev,
iommu_invalid_ppr_cb);
+ err = kfd_bind_processes_to_device(kfd);
+ if (err)
+ goto processes_bind_error;
+
err = kfd->dqm->ops.start(kfd->dqm);
if (err) {
dev_err(kfd_device,
@@ -373,6 +381,7 @@ static int kfd_resume(struct kfd_dev *kf
return err;
dqm_start_error:
+processes_bind_error:
amd_iommu_free_device(kfd->pdev);
return err;
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -670,7 +670,6 @@ static int initialize_cpsch(struct devic
static int start_cpsch(struct device_queue_manager *dqm)
{
- struct device_process_node *node;
int retval;
retval = 0;
@@ -697,11 +696,6 @@ static int start_cpsch(struct device_que
init_interrupts(dqm);
- list_for_each_entry(node, &dqm->queues, list)
- if (node->qpd->pqm->process && dqm->dev)
- kfd_bind_process_to_device(dqm->dev,
- node->qpd->pqm->process);
-
execute_queues_cpsch(dqm, true);
return 0;
@@ -714,15 +708,8 @@ fail_packet_manager_init:
static int stop_cpsch(struct device_queue_manager *dqm)
{
- struct device_process_node *node;
- struct kfd_process_device *pdd;
-
destroy_queues_cpsch(dqm, true, true);
- list_for_each_entry(node, &dqm->queues, list) {
- pdd = qpd_to_pdd(node->qpd);
- pdd->bound = false;
- }
kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
pm_uninit(&dqm->packets);
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -432,6 +432,13 @@ struct qcm_process_device {
uint32_t sh_hidden_private_base;
};
+
+enum kfd_pdd_bound {
+ PDD_UNBOUND = 0,
+ PDD_BOUND,
+ PDD_BOUND_SUSPENDED,
+};
+
/* Data that is per-process-per device. */
struct kfd_process_device {
/*
@@ -456,7 +463,7 @@ struct kfd_process_device {
uint64_t scratch_limit;
/* Is this process/pasid bound to this device? (amd_iommu_bind_pasid) */
- bool bound;
+ enum kfd_pdd_bound bound;
/* This flag tells if we should reset all
* wavefronts on process termination
@@ -547,8 +554,10 @@ struct kfd_process *kfd_get_process(cons
struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid);
struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
- struct kfd_process *p);
-void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid);
+ struct kfd_process *p);
+int kfd_bind_processes_to_device(struct kfd_dev *dev);
+void kfd_unbind_processes_from_device(struct kfd_dev *dev);
+void kfd_process_iommu_unbind_callback(struct kfd_dev *dev, unsigned int pasid);
struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
struct kfd_process *p);
struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -174,9 +174,10 @@ static void kfd_process_wq_release(struc
if (pdd->reset_wavefronts)
dbgdev_wave_reset_wavefronts(pdd->dev, p);
- amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
- list_del(&pdd->per_device_list);
+ if (pdd->bound == PDD_BOUND)
+ amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
+ list_del(&pdd->per_device_list);
kfree(pdd);
}
@@ -351,9 +352,9 @@ struct kfd_process_device *kfd_get_proce
list_for_each_entry(pdd, &p->per_device_data, per_device_list)
if (pdd->dev == dev)
- break;
+ return pdd;
- return pdd;
+ return NULL;
}
struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
@@ -368,6 +369,7 @@ struct kfd_process_device *kfd_create_pr
INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
pdd->qpd.dqm = dev->dqm;
pdd->reset_wavefronts = false;
+ pdd->bound = PDD_UNBOUND;
list_add(&pdd->per_device_list, &p->per_device_data);
}
@@ -393,19 +395,91 @@ struct kfd_process_device *kfd_bind_proc
return ERR_PTR(-ENOMEM);
}
- if (pdd->bound)
+ if (pdd->bound == PDD_BOUND) {
return pdd;
+ } else if (unlikely(pdd->bound == PDD_BOUND_SUSPENDED)) {
+ pr_err("Binding PDD_BOUND_SUSPENDED pdd is unexpected!\n");
+ return ERR_PTR(-EINVAL);
+ }
err = amd_iommu_bind_pasid(dev->pdev, p->pasid, p->lead_thread);
if (err < 0)
return ERR_PTR(err);
- pdd->bound = true;
+ pdd->bound = PDD_BOUND;
return pdd;
}
-void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
+/*
+ * Bind processes do the device that have been temporarily unbound
+ * (PDD_BOUND_SUSPENDED) in kfd_unbind_processes_from_device.
+ */
+int kfd_bind_processes_to_device(struct kfd_dev *dev)
+{
+ struct kfd_process_device *pdd;
+ struct kfd_process *p;
+ unsigned int temp;
+ int err = 0;
+
+ int idx = srcu_read_lock(&kfd_processes_srcu);
+
+ hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+ mutex_lock(&p->mutex);
+ pdd = kfd_get_process_device_data(dev, p);
+ if (pdd->bound != PDD_BOUND_SUSPENDED) {
+ mutex_unlock(&p->mutex);
+ continue;
+ }
+
+ err = amd_iommu_bind_pasid(dev->pdev, p->pasid,
+ p->lead_thread);
+ if (err < 0) {
+ pr_err("unexpected pasid %d binding failure\n",
+ p->pasid);
+ mutex_unlock(&p->mutex);
+ break;
+ }
+
+ pdd->bound = PDD_BOUND;
+ mutex_unlock(&p->mutex);
+ }
+
+ srcu_read_unlock(&kfd_processes_srcu, idx);
+
+ return err;
+}
+
+/*
+ * Temporarily unbind currently bound processes from the device and
+ * mark them as PDD_BOUND_SUSPENDED. These processes will be restored
+ * to PDD_BOUND state in kfd_bind_processes_to_device.
+ */
+void kfd_unbind_processes_from_device(struct kfd_dev *dev)
+{
+ struct kfd_process_device *pdd;
+ struct kfd_process *p;
+ unsigned int temp, temp_bound, temp_pasid;
+
+ int idx = srcu_read_lock(&kfd_processes_srcu);
+
+ hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+ mutex_lock(&p->mutex);
+ pdd = kfd_get_process_device_data(dev, p);
+ temp_bound = pdd->bound;
+ temp_pasid = p->pasid;
+ if (pdd->bound == PDD_BOUND)
+ pdd->bound = PDD_BOUND_SUSPENDED;
+ mutex_unlock(&p->mutex);
+
+ if (temp_bound == PDD_BOUND)
+ amd_iommu_unbind_pasid(dev->pdev, temp_pasid);
+ }
+
+ srcu_read_unlock(&kfd_processes_srcu, idx);
+}
+
+void kfd_process_iommu_unbind_callback(struct kfd_dev *dev, unsigned int pasid)
{
struct kfd_process *p;
struct kfd_process_device *pdd;
@@ -438,15 +512,6 @@ void kfd_unbind_process_from_device(stru
pdd->reset_wavefronts = false;
}
- /*
- * Just mark pdd as unbound, because we still need it
- * to call amd_iommu_unbind_pasid() in when the
- * process exits.
- * We don't call amd_iommu_unbind_pasid() here
- * because the IOMMU called us.
- */
- pdd->bound = false;
-
mutex_unlock(&p->mutex);
}