linux-kernel - [PATCH v5 07/10] crypto: hisilicon/qm - fix VF not available after PF FLR

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Date:   Sat, 15 Aug 2020 17:56:14 +0800
From:   Yang Shen <shenyang39@...wei.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <xuzaibo@...wei.com>, <wangzhou1@...ilicon.com>
Subject: [PATCH v5 07/10] crypto: hisilicon/qm - fix VF not available after PF FLR

From: Shukun Tan <tanshukun1@...wei.com>

When PF FLR, the hardware will actively trigger the VF FLR. Configuration
space of VF needs to be saved and restored to ensure that it is available
after the PF FLR.

Fixes: 7ce396fa12a9("crypto: hisilicon - add FLR support")
Signed-off-by: Shukun Tan <tanshukun1@...wei.com>
Signed-off-by: Yang Shen <shenyang39@...wei.com>
Reviewed-by: Zhou Wang <wangzhou1@...ilicon.com>
---
 drivers/crypto/hisilicon/qm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 6d233b4..3c37e00 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -3318,6 +3318,9 @@ static int qm_vf_reset_prepare(struct hisi_qm *qm,
 			continue;
 
 		if (pci_physfn(virtfn) == pdev) {
+			/* save VFs PCIE BAR configuration */
+			pci_save_state(virtfn);
+
 			ret = hisi_qm_stop(vf_qm, stop_reason);
 			if (ret)
 				goto stop_fail;
@@ -3481,6 +3484,9 @@ static int qm_vf_reset_done(struct hisi_qm *qm)
 			continue;
 
 		if (pci_physfn(virtfn) == pdev) {
+			/* enable VFs PCIE BAR configuration */
+			pci_restore_state(virtfn);
+
 			ret = qm_restart(vf_qm);
 			if (ret)
 				goto restart_fail;
-- 
2.7.4