linux-kernel - [RFC v4 6/8] crypto: hisilicon/qm: Add helper to retrieve the PF qm data

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Message-ID: <20220208133425.1096-7-shameerali.kolothum.thodi@huawei.com>
Date:   Tue, 8 Feb 2022 13:34:23 +0000
From:   Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
To:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>
CC:     <alex.williamson@...hat.com>, <jgg@...dia.com>,
        <cohuck@...hat.com>, <mgurtovoy@...dia.com>, <yishaih@...dia.com>,
        <linuxarm@...wei.com>, <liulongfang@...wei.com>,
        <prime.zeng@...ilicon.com>, <jonathan.cameron@...wei.com>,
        <wangzhou1@...ilicon.com>
Subject: [RFC v4 6/8] crypto: hisilicon/qm: Add helper to retrieve the PF qm data

Provides a new interface to retrieve the PF QM data associated
with a ACC VF dev. This makes use of the  pci_iov_get_pf_drvdata()
to get PF drvdata safely. Introduces helpers to retrieve the ACC
PF dev struct pci_driver pointers as this is an input into the
pci_iov_get_pf_drvdata().

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
---
 drivers/crypto/hisilicon/hpre/hpre_main.c |  6 ++++
 drivers/crypto/hisilicon/qm.c             | 38 +++++++++++++++++++++++
 drivers/crypto/hisilicon/sec2/sec_main.c  |  6 ++++
 drivers/crypto/hisilicon/zip/zip_main.c   |  6 ++++
 include/linux/hisi_acc_qm.h               |  6 ++++
 5 files changed, 62 insertions(+)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
index ba4043447e53..80fb9ef8c571 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_main.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
@@ -1189,6 +1189,12 @@ static struct pci_driver hpre_pci_driver = {
 	.driver.pm		= &hpre_pm_ops,
 };
 
+struct pci_driver *hisi_hpre_get_pf_driver(void)
+{
+	return &hpre_pci_driver;
+}
+EXPORT_SYMBOL(hisi_hpre_get_pf_driver);
+
 static void hpre_register_debugfs(void)
 {
 	if (!debugfs_initialized())
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 8c29f9fba573..b2858a6f925a 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -5999,6 +5999,44 @@ void hisi_qm_put_dfx_access(struct hisi_qm *qm)
 }
 EXPORT_SYMBOL_GPL(hisi_qm_put_dfx_access);
 
+struct hisi_qm *hisi_qm_get_pf_qm(struct pci_dev *pdev)
+{
+	struct hisi_qm	*pf_qm;
+	struct pci_driver *(*fn)(void) = NULL;
+
+	if (!pdev->is_virtfn)
+		return NULL;
+
+	switch (pdev->device) {
+	case PCI_DEVICE_ID_HUAWEI_SEC_VF:
+		fn = symbol_get(hisi_sec_get_pf_driver);
+		break;
+	case PCI_DEVICE_ID_HUAWEI_HPRE_VF:
+		fn = symbol_get(hisi_hpre_get_pf_driver);
+		break;
+	case PCI_DEVICE_ID_HUAWEI_ZIP_VF:
+		fn = symbol_get(hisi_zip_get_pf_driver);
+		break;
+	default:
+		return NULL;
+	}
+
+	if (!fn)
+		return NULL;
+
+	pf_qm = pci_iov_get_pf_drvdata(pdev, fn());
+
+	if (pdev->device == PCI_DEVICE_ID_HUAWEI_SEC_VF)
+		symbol_put(hisi_sec_get_pf_driver);
+	else if (pdev->device == PCI_DEVICE_ID_HUAWEI_HPRE_VF)
+		symbol_put(hisi_hpre_get_pf_driver);
+	else
+		symbol_put(hisi_zip_get_pf_driver);
+
+	return !IS_ERR(pf_qm) ? pf_qm : NULL;
+}
+EXPORT_SYMBOL_GPL(hisi_qm_get_pf_qm);
+
 /**
  * hisi_qm_pm_init() - Initialize qm runtime PM.
  * @qm: pointer to accelerator device.
diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
index ab806fb481ac..d8fb5c2b3482 100644
--- a/drivers/crypto/hisilicon/sec2/sec_main.c
+++ b/drivers/crypto/hisilicon/sec2/sec_main.c
@@ -1087,6 +1087,12 @@ static struct pci_driver sec_pci_driver = {
 	.driver.pm = &sec_pm_ops,
 };
 
+struct pci_driver *hisi_sec_get_pf_driver(void)
+{
+	return &sec_pci_driver;
+}
+EXPORT_SYMBOL(hisi_sec_get_pf_driver);
+
 static void sec_register_debugfs(void)
 {
 	if (!debugfs_initialized())
diff --git a/drivers/crypto/hisilicon/zip/zip_main.c b/drivers/crypto/hisilicon/zip/zip_main.c
index f4a517728385..b6ccc7e8f37e 100644
--- a/drivers/crypto/hisilicon/zip/zip_main.c
+++ b/drivers/crypto/hisilicon/zip/zip_main.c
@@ -1010,6 +1010,12 @@ static struct pci_driver hisi_zip_pci_driver = {
 	.driver.pm		= &hisi_zip_pm_ops,
 };
 
+struct pci_driver *hisi_zip_get_pf_driver(void)
+{
+	return &hisi_zip_pci_driver;
+}
+EXPORT_SYMBOL(hisi_zip_get_pf_driver);
+
 static void hisi_zip_register_debugfs(void)
 {
 	if (!debugfs_initialized())
diff --git a/include/linux/hisi_acc_qm.h b/include/linux/hisi_acc_qm.h
index 8befb59c6fb3..6dbc5df2923b 100644
--- a/include/linux/hisi_acc_qm.h
+++ b/include/linux/hisi_acc_qm.h
@@ -476,4 +476,10 @@ void hisi_qm_pm_init(struct hisi_qm *qm);
 int hisi_qm_get_dfx_access(struct hisi_qm *qm);
 void hisi_qm_put_dfx_access(struct hisi_qm *qm);
 void hisi_qm_regs_dump(struct seq_file *s, struct debugfs_regset32 *regset);
+
+/* Used by VFIO ACC live migration driver */
+struct hisi_qm *hisi_qm_get_pf_qm(struct pci_dev *pdev);
+struct pci_driver *hisi_sec_get_pf_driver(void);
+struct pci_driver *hisi_hpre_get_pf_driver(void);
+struct pci_driver *hisi_zip_get_pf_driver(void);
 #endif
-- 
2.17.1