drm/amdgpu/kfd: remove is_hws_hang and is_resetting

is_hws_hang and is_resetting serves pretty much the same purpose and
they all duplicates the work of the reset_domain lock, just check that
directly instead. This also eliminate a few bugs listed below and get
rid of dqm->ops.pre_reset.

kfd_hws_hang did not need to avoid scheduling another reset. If the
on-going reset decided to skip GPU reset we have a bad time, otherwise
the extra reset will get cancelled anyway.

remove_queue_mes forgot to check is_resetting flag compared to the
pre-MES path unmap_queue_cpsch, so it did not block hw access during
reset correctly.
Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -936,7 +936,6 @@ int kgd2kfd_pre_reset(struct kfd_dev *kfd,
 	for (i = 0; i < kfd->num_nodes; i++) {
 		node = kfd->nodes[i];
 		kfd_smi_event_update_gpu_reset(node, false, reset_context);
-		node->dqm->ops.pre_reset(node->dqm);
 	}
 
 	kgd2kfd_suspend(kfd, false);

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

@@ -35,6 +35,7 @@
 #include "cik_regs.h"
 #include "kfd_kernel_queue.h"
 #include "amdgpu_amdkfd.h"
+#include "amdgpu_reset.h"
 #include "mes_v11_api_def.h"
 #include "kfd_debug.h"
 
@@ -155,13 +156,6 @@ static void kfd_hws_hang(struct device_queue_manager *dqm)
 	/*
 	 * Issue a GPU reset if HWS is unresponsive
 	 */
-	dqm->is_hws_hang = true;
-
-	/* It's possible we're detecting a HWS hang in the
-	 * middle of a GPU reset. No need to schedule another
-	 * reset in this case.
-	 */
-	if (!dqm->is_resetting)
 	schedule_work(&dqm->hw_exception_work);
 }
 
@@ -194,7 +188,7 @@ static int add_queue_mes(struct device_queue_manager *dqm, struct queue *q,
 	int r, queue_type;
 	uint64_t wptr_addr_off;
 
-	if (dqm->is_hws_hang)
+	if (!down_read_trylock(&adev->reset_domain->sem))
 		return -EIO;
 
 	memset(&queue_input, 0x0, sizeof(struct mes_add_queue_input));
@@ -245,6 +239,7 @@ static int add_queue_mes(struct device_queue_manager *dqm, struct queue *q,
 	amdgpu_mes_lock(&adev->mes);
 	r = adev->mes.funcs->add_hw_queue(&adev->mes, &queue_input);
 	amdgpu_mes_unlock(&adev->mes);
+	up_read(&adev->reset_domain->sem);
 	if (r) {
 		dev_err(adev->dev, "failed to add hardware queue to MES, doorbell=0x%x\n",
 			q->properties.doorbell_off);
@@ -262,7 +257,7 @@ static int remove_queue_mes(struct device_queue_manager *dqm, struct queue *q,
 	int r;
 	struct mes_remove_queue_input queue_input;
 
-	if (dqm->is_hws_hang)
+	if (!down_read_trylock(&adev->reset_domain->sem))
 		return -EIO;
 
 	memset(&queue_input, 0x0, sizeof(struct mes_remove_queue_input));
@@ -272,6 +267,7 @@ static int remove_queue_mes(struct device_queue_manager *dqm, struct queue *q,
 	amdgpu_mes_lock(&adev->mes);
 	r = adev->mes.funcs->remove_hw_queue(&adev->mes, &queue_input);
 	amdgpu_mes_unlock(&adev->mes);
+	up_read(&adev->reset_domain->sem);
 
 	if (r) {
 		dev_err(adev->dev, "failed to remove hardware queue from MES, doorbell=0x%x\n",
@@ -1468,20 +1464,13 @@ static int stop_nocpsch(struct device_queue_manager *dqm)
 	}
 
 	if (dqm->dev->adev->asic_type == CHIP_HAWAII)
-		pm_uninit(&dqm->packet_mgr, false);
+		pm_uninit(&dqm->packet_mgr);
 	dqm->sched_running = false;
 	dqm_unlock(dqm);
 
 	return 0;
 }
 
-static void pre_reset(struct device_queue_manager *dqm)
-{
-	dqm_lock(dqm);
-	dqm->is_resetting = true;
-	dqm_unlock(dqm);
-}
-
 static int allocate_sdma_queue(struct device_queue_manager *dqm,
 				struct queue *q, const uint32_t *restore_sdma_id)
 {
@@ -1669,8 +1658,6 @@ static int start_cpsch(struct device_queue_manager *dqm)
 	init_interrupts(dqm);
 
 	/* clear hang status when driver try to start the hw scheduler */
-	dqm->is_hws_hang = false;
-	dqm->is_resetting = false;
 	dqm->sched_running = true;
 
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
@@ -1700,7 +1687,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
 fail_allocate_vidmem:
 fail_set_sched_resources:
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
-		pm_uninit(&dqm->packet_mgr, false);
+		pm_uninit(&dqm->packet_mgr);
 fail_packet_manager_init:
 	dqm_unlock(dqm);
 	return retval;
@@ -1708,22 +1695,17 @@ static int start_cpsch(struct device_queue_manager *dqm)
 
 static int stop_cpsch(struct device_queue_manager *dqm)
 {
-	bool hanging;
-
 	dqm_lock(dqm);
 	if (!dqm->sched_running) {
 		dqm_unlock(dqm);
 		return 0;
 	}
 
-	if (!dqm->is_hws_hang) {
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
 		unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0, USE_DEFAULT_GRACE_PERIOD, false);
 	else
 		remove_all_queues_mes(dqm);
-	}
 
-	hanging = dqm->is_hws_hang || dqm->is_resetting;
 	dqm->sched_running = false;
 
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
@@ -1731,7 +1713,7 @@ static int stop_cpsch(struct device_queue_manager *dqm)
 
 	kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
-		pm_uninit(&dqm->packet_mgr, hanging);
+		pm_uninit(&dqm->packet_mgr);
 	dqm_unlock(dqm);
 
 	return 0;
@@ -1957,24 +1939,24 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 {
 	struct device *dev = dqm->dev->adev->dev;
 	struct mqd_manager *mqd_mgr;
-	int retval = 0;
+	int retval;
 
 	if (!dqm->sched_running)
 		return 0;
-	if (dqm->is_hws_hang || dqm->is_resetting)
-		return -EIO;
 	if (!dqm->active_runlist)
-		return retval;
+		return 0;
+	if (!down_read_trylock(&dqm->dev->adev->reset_domain->sem))
+		return -EIO;
 
 	if (grace_period != USE_DEFAULT_GRACE_PERIOD) {
 		retval = pm_update_grace_period(&dqm->packet_mgr, grace_period);
 		if (retval)
-			return retval;
+			goto out;
 	}
 
 	retval = pm_send_unmap_queue(&dqm->packet_mgr, filter, filter_param, reset);
 	if (retval)
-		return retval;
+		goto out;
 
 	*dqm->fence_addr = KFD_FENCE_INIT;
 	pm_send_query_status(&dqm->packet_mgr, dqm->fence_gpu_addr,
@@ -1985,7 +1967,7 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 	if (retval) {
 		dev_err(dev, "The cp might be in an unrecoverable state due to an unsuccessful queues preemption\n");
 		kfd_hws_hang(dqm);
-		return retval;
+		goto out;
 	}
 
 	/* In the current MEC firmware implementation, if compute queue
@@ -2001,7 +1983,8 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 		while (halt_if_hws_hang)
 			schedule();
 		kfd_hws_hang(dqm);
-		return -ETIME;
+		retval = -ETIME;
+		goto out;
 	}
 
 	/* We need to reset the grace period value for this device */
@@ -2014,6 +1997,8 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
 	pm_release_ib(&dqm->packet_mgr);
 	dqm->active_runlist = false;
 
+out:
+	up_read(&dqm->dev->adev->reset_domain->sem);
 	return retval;
 }
 
@@ -2040,13 +2025,13 @@ static int execute_queues_cpsch(struct device_queue_manager *dqm,
 {
 	int retval;
 
-	if (dqm->is_hws_hang)
+	if (!down_read_trylock(&dqm->dev->adev->reset_domain->sem))
 		return -EIO;
 	retval = unmap_queues_cpsch(dqm, filter, filter_param, grace_period, false);
-	if (retval)
+	if (!retval)
+		retval = map_queues_cpsch(dqm);
+	up_read(&dqm->dev->adev->reset_domain->sem);
 	return retval;
-
-	return map_queues_cpsch(dqm);
 }
 
 static int wait_on_destroy_queue(struct device_queue_manager *dqm,
@@ -2427,10 +2412,12 @@ static int process_termination_cpsch(struct device_queue_manager *dqm,
 	if (!dqm->dev->kfd->shared_resources.enable_mes)
 		retval = execute_queues_cpsch(dqm, filter, 0, USE_DEFAULT_GRACE_PERIOD);
 
-	if ((!dqm->is_hws_hang) && (retval || qpd->reset_wavefronts)) {
+	if ((retval || qpd->reset_wavefronts) &&
+	    down_read_trylock(&dqm->dev->adev->reset_domain->sem)) {
 		pr_warn("Resetting wave fronts (cpsch) on dev %p\n", dqm->dev);
 		dbgdev_wave_reset_wavefronts(dqm->dev, qpd->pqm->process);
 		qpd->reset_wavefronts = false;
+		up_read(&dqm->dev->adev->reset_domain->sem);
 	}
 
 	/* Lastly, free mqd resources.
@@ -2537,7 +2524,6 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_node *dev)
 		dqm->ops.initialize = initialize_cpsch;
 		dqm->ops.start = start_cpsch;
 		dqm->ops.stop = stop_cpsch;
-		dqm->ops.pre_reset = pre_reset;
 		dqm->ops.destroy_queue = destroy_queue_cpsch;
 		dqm->ops.update_queue = update_queue;
 		dqm->ops.register_process = register_process;
@@ -2558,7 +2544,6 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_node *dev)
 		/* initialize dqm for no cp scheduling */
 		dqm->ops.start = start_nocpsch;
 		dqm->ops.stop = stop_nocpsch;
-		dqm->ops.pre_reset = pre_reset;
 		dqm->ops.create_queue = create_queue_nocpsch;
 		dqm->ops.destroy_queue = destroy_queue_nocpsch;
 		dqm->ops.update_queue = update_queue;

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h

@@ -152,7 +152,6 @@ struct device_queue_manager_ops {
 	int	(*initialize)(struct device_queue_manager *dqm);
 	int	(*start)(struct device_queue_manager *dqm);
 	int	(*stop)(struct device_queue_manager *dqm);
-	void	(*pre_reset)(struct device_queue_manager *dqm);
 	void	(*uninitialize)(struct device_queue_manager *dqm);
 	int	(*create_kernel_queue)(struct device_queue_manager *dqm,
 					struct kernel_queue *kq,

drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c

@@ -32,6 +32,7 @@
 #include "kfd_device_queue_manager.h"
 #include "kfd_pm4_headers.h"
 #include "kfd_pm4_opcodes.h"
+#include "amdgpu_reset.h"
 
 #define PM4_COUNT_ZERO (((1 << 15) - 1) << 16)
 
@@ -196,15 +197,17 @@ static bool kq_initialize(struct kernel_queue *kq, struct kfd_node *dev,
 }
 
 /* Uninitialize a kernel queue and free all its memory usages. */
-static void kq_uninitialize(struct kernel_queue *kq, bool hanging)
+static void kq_uninitialize(struct kernel_queue *kq)
 {
-	if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && !hanging)
+	if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && down_read_trylock(&kq->dev->adev->reset_domain->sem)) {
 		kq->mqd_mgr->destroy_mqd(kq->mqd_mgr,
 					kq->queue->mqd,
 					KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
 					KFD_UNMAP_LATENCY_MS,
 					kq->queue->pipe,
 					kq->queue->queue);
+		up_read(&kq->dev->adev->reset_domain->sem);
+	}
 	else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
 		kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
 
@@ -344,9 +347,9 @@ struct kernel_queue *kernel_queue_init(struct kfd_node *dev,
 	return NULL;
 }
 
-void kernel_queue_uninit(struct kernel_queue *kq, bool hanging)
+void kernel_queue_uninit(struct kernel_queue *kq)
 {
-	kq_uninitialize(kq, hanging);
+	kq_uninitialize(kq);
 	kfree(kq);
 }
 

drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c

@@ -263,10 +263,10 @@ int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm)
 	return 0;
 }
 
-void pm_uninit(struct packet_manager *pm, bool hanging)
+void pm_uninit(struct packet_manager *pm)
 {
 	mutex_destroy(&pm->lock);
-	kernel_queue_uninit(pm->priv_queue, hanging);
+	kernel_queue_uninit(pm->priv_queue);
 	pm->priv_queue = NULL;
 }
 

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -1301,7 +1301,7 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_node *dev);
 void device_queue_manager_uninit(struct device_queue_manager *dqm);
 struct kernel_queue *kernel_queue_init(struct kfd_node *dev,
 					enum kfd_queue_type type);
-void kernel_queue_uninit(struct kernel_queue *kq, bool hanging);
+void kernel_queue_uninit(struct kernel_queue *kq);
 int kfd_dqm_evict_pasid(struct device_queue_manager *dqm, u32 pasid);
 
 /* Process Queue Manager */
@@ -1407,7 +1407,7 @@ extern const struct packet_manager_funcs kfd_v9_pm_funcs;
 extern const struct packet_manager_funcs kfd_aldebaran_pm_funcs;
 
 int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm);
-void pm_uninit(struct packet_manager *pm, bool hanging);
+void pm_uninit(struct packet_manager *pm);
 int pm_send_set_resources(struct packet_manager *pm,
 				struct scheduling_resources *res);
 int pm_send_runlist(struct packet_manager *pm, struct list_head *dqm_queues);

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -434,7 +434,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 err_create_queue:
 	uninit_queue(q);
 	if (kq)
-		kernel_queue_uninit(kq, false);
+		kernel_queue_uninit(kq);
 	kfree(pqn);
 err_allocate_pqn:
 	/* check if queues list is empty unregister process from device */
@@ -481,7 +481,7 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
 		/* destroy kernel queue (DIQ) */
 		dqm = pqn->kq->dev->dqm;
 		dqm->ops.destroy_kernel_queue(dqm, pqn->kq, &pdd->qpd);
-		kernel_queue_uninit(pqn->kq, false);
+		kernel_queue_uninit(pqn->kq);
 	}
 
 	if (pqn->q) {