linux-kernel - [PATCH AUTOSEL for 4.4 12/35] drm/amdkfd: Fix SDMA oversubsription handling

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Message-ID: <20180124041645.32420-12-alexander.levin@microsoft.com>
Date:   Wed, 24 Jan 2018 04:16:58 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Felix Kuehling <Felix.Kuehling@....com>,
        shaoyun liu <shaoyun.liu@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 12/35] drm/amdkfd: Fix SDMA oversubsription
 handling

From: Felix Kuehling <Felix.Kuehling@....com>

[ Upstream commit 8c946b8988acec785bcf67088b6bd0747f36d2d3 ]

SDMA only supports a fixed number of queues. HWS cannot handle
oversubscription.

Signed-off-by: shaoyun liu <shaoyun.liu@....com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
index 7b69070f7ecc..aa41b840048f 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -205,6 +205,24 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 
 	switch (type) {
 	case KFD_QUEUE_TYPE_SDMA:
+		if (dev->dqm->queue_count >=
+			CIK_SDMA_QUEUES_PER_ENGINE * CIK_SDMA_ENGINE_NUM) {
+			pr_err("Over-subscription is not allowed for SDMA.\n");
+			retval = -EPERM;
+			goto err_create_queue;
+		}
+
+		retval = create_cp_queue(pqm, dev, &q, properties, f, *qid);
+		if (retval != 0)
+			goto err_create_queue;
+		pqn->q = q;
+		pqn->kq = NULL;
+		retval = dev->dqm->ops.create_queue(dev->dqm, q, &pdd->qpd,
+						&q->properties.vmid);
+		pr_debug("DQM returned %d for create_queue\n", retval);
+		print_queue(q);
+		break;
+
 	case KFD_QUEUE_TYPE_COMPUTE:
 		/* check if there is over subscription */
 		if ((sched_policy == KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION) &&
-- 
2.11.0