Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From:   Brett Creeley <brett.creeley@amd.com>
To:     <jgg@ziepe.ca>, <yishaih@nvidia.com>, <liulongfang@huawei.com>,
        <shameerali.kolothum.thodi@huawei.com>, <kevin.tian@intel.com>,
        <alex.williamson@redhat.com>, <kvm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC:     <shannon.nelson@amd.com>, <brett.creeley@amd.com>
Subject: [PATCH vfio 1/2] hisi_acc_vfio_pci: Change reset_lock to mutex_lock
Date:   Wed, 22 Nov 2023 11:36:33 -0800
Message-ID: <20231122193634.27250-2-brett.creeley@amd.com>
In-Reply-To: <20231122193634.27250-1-brett.creeley@amd.com>
References: <20231122193634.27250-1-brett.creeley@amd.com>
MIME-Version: 1.0
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Nov 2023 19:37:02.0342
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: f1ebfa90-00a1-4f7d-35cc-08dbeb926698
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000989EC.namprd02.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7437
X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE
	autolearn=unavailable autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Wed, 22 Nov 2023 11:38:39 -0800 (PST)

Based on comments from other vfio vendors and the
maintainer the vfio/pds driver changed the reset_lock
to a mutex_lock. As part of that change it was requested
that the other vendor drivers be changed as well. So,
make the change.

The comment that requested the change for reference:
https://lore.kernel.org/kvm/BN9PR11MB52769E037CB356AB15A0D9B88CA0A@BN9PR11MB5276.namprd11.prod.outlook.com/

Also, make checkpatch happy by moving the lock comment.

Signed-off-by: Brett Creeley <brett.creeley@amd.com>
---
 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 13 +++++++------
 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h |  3 +--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index b2f9778c8366..2c049b8de4b4 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -638,17 +638,17 @@ static void
 hisi_acc_vf_state_mutex_unlock(struct hisi_acc_vf_core_device *hisi_acc_vdev)
 {
 again:
-	spin_lock(&hisi_acc_vdev->reset_lock);
+	mutex_lock(&hisi_acc_vdev->reset_mutex);
 	if (hisi_acc_vdev->deferred_reset) {
 		hisi_acc_vdev->deferred_reset = false;
-		spin_unlock(&hisi_acc_vdev->reset_lock);
+		mutex_unlock(&hisi_acc_vdev->reset_mutex);
 		hisi_acc_vdev->vf_qm_state = QM_NOT_READY;
 		hisi_acc_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
 		hisi_acc_vf_disable_fds(hisi_acc_vdev);
 		goto again;
 	}
 	mutex_unlock(&hisi_acc_vdev->state_mutex);
-	spin_unlock(&hisi_acc_vdev->reset_lock);
+	mutex_unlock(&hisi_acc_vdev->reset_mutex);
 }
 
 static void hisi_acc_vf_start_device(struct hisi_acc_vf_core_device *hisi_acc_vdev)
@@ -1108,13 +1108,13 @@ static void hisi_acc_vf_pci_aer_reset_done(struct pci_dev *pdev)
 	 * In case the state_mutex was taken already we defer the cleanup work
 	 * to the unlock flow of the other running context.
 	 */
-	spin_lock(&hisi_acc_vdev->reset_lock);
+	mutex_lock(&hisi_acc_vdev->reset_mutex);
 	hisi_acc_vdev->deferred_reset = true;
 	if (!mutex_trylock(&hisi_acc_vdev->state_mutex)) {
-		spin_unlock(&hisi_acc_vdev->reset_lock);
+		mutex_unlock(&hisi_acc_vdev->reset_mutex);
 		return;
 	}
-	spin_unlock(&hisi_acc_vdev->reset_lock);
+	mutex_unlock(&hisi_acc_vdev->reset_mutex);
 	hisi_acc_vf_state_mutex_unlock(hisi_acc_vdev);
 }
 
@@ -1350,6 +1350,7 @@ static int hisi_acc_vfio_pci_migrn_init_dev(struct vfio_device *core_vdev)
 	hisi_acc_vdev->pf_qm = pf_qm;
 	hisi_acc_vdev->vf_dev = pdev;
 	mutex_init(&hisi_acc_vdev->state_mutex);
+	mutex_init(&hisi_acc_vdev->reset_mutex);
 
 	core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_PRE_COPY;
 	core_vdev->mig_ops = &hisi_acc_vfio_pci_migrn_state_ops;
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
index dcabfeec6ca1..ed5ab332d0f3 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
@@ -109,8 +109,7 @@ struct hisi_acc_vf_core_device {
 	struct hisi_qm vf_qm;
 	u32 vf_qm_state;
 	int vf_id;
-	/* For reset handler */
-	spinlock_t reset_lock;
+	struct mutex reset_mutex; /* For reset handler */
 	struct hisi_acc_vf_migration_file *resuming_migf;
 	struct hisi_acc_vf_migration_file *saving_migf;
 };
-- 
2.17.1