linux-kernel - [PATCH v7 2/3] migration: qm updates BAR configuration

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Message-ID: <20250805065106.898298-3-liulongfang@huawei.com>
Date: Tue, 5 Aug 2025 14:51:05 +0800
From: Longfang Liu <liulongfang@...wei.com>
To: <alex.williamson@...hat.com>, <jgg@...dia.com>,
	<herbert@...dor.apana.org.au>, <shameerali.kolothum.thodi@...wei.com>,
	<jonathan.cameron@...wei.com>
CC: <linux-crypto@...r.kernel.org>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>,
	<liulongfang@...wei.com>
Subject: [PATCH v7 2/3] migration: qm updates BAR configuration

On new platforms greater than QM_HW_V3, the configuration region for the
live migration function of the accelerator device is no longer
placed in the VF, but is instead placed in the PF.

Therefore, the configuration region of the live migration function
needs to be opened when the QM driver is loaded. When the QM driver
is uninstalled, the driver needs to clear this configuration.

Signed-off-by: Longfang Liu <liulongfang@...wei.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
---
 drivers/crypto/hisilicon/qm.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 7c41f9593d03..b5ce9b1e9c56 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -242,6 +242,9 @@
 #define QM_QOS_MAX_CIR_U		6
 #define QM_AUTOSUSPEND_DELAY		3000
 
+#define QM_MIG_REGION_SEL		0x100198
+#define QM_MIG_REGION_EN		0x1
+
  /* abnormal status value for stopping queue */
 #define QM_STOP_QUEUE_FAIL		1
 #define	QM_DUMP_SQC_FAIL		3
@@ -3004,11 +3007,36 @@ static void qm_put_pci_res(struct hisi_qm *qm)
 	pci_release_mem_regions(pdev);
 }
 
+static void hisi_mig_region_clear(struct hisi_qm *qm)
+{
+	u32 val;
+
+	/* Clear migration region set of PF */
+	if (qm->fun_type == QM_HW_PF && qm->ver > QM_HW_V3) {
+		val = readl(qm->io_base + QM_MIG_REGION_SEL);
+		val &= ~BIT(0);
+		writel(val, qm->io_base + QM_MIG_REGION_SEL);
+	}
+}
+
+static void hisi_mig_region_enable(struct hisi_qm *qm)
+{
+	u32 val;
+
+	/* Select migration region of PF */
+	if (qm->fun_type == QM_HW_PF && qm->ver > QM_HW_V3) {
+		val = readl(qm->io_base + QM_MIG_REGION_SEL);
+		val |= QM_MIG_REGION_EN;
+		writel(val, qm->io_base + QM_MIG_REGION_SEL);
+	}
+}
+
 static void hisi_qm_pci_uninit(struct hisi_qm *qm)
 {
 	struct pci_dev *pdev = qm->pdev;
 
 	pci_free_irq_vectors(pdev);
+	hisi_mig_region_clear(qm);
 	qm_put_pci_res(qm);
 	pci_disable_device(pdev);
 }
@@ -5630,6 +5658,7 @@ int hisi_qm_init(struct hisi_qm *qm)
 		goto err_free_qm_memory;
 
 	qm_cmd_init(qm);
+	hisi_mig_region_enable(qm);
 
 	return 0;
 
-- 
2.24.0