linux-kernel - [PATCH v2] nitro_enclaves: Set Bus Master for the NE PCI device

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Message-ID: <20210621004046.1419-1-longpeng2@huawei.com>
Date:   Mon, 21 Jun 2021 08:40:46 +0800
From:   "Longpeng(Mike)" <longpeng2@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <arei.gonglei@...wei.com>, "Longpeng(Mike)" <longpeng2@...wei.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Andra Paraschiv <andraprs@...zon.com>,
        Alexandru Vasile <lexnv@...zon.com>,
        "Alexandru Ciobotaru" <alcioa@...zon.com>
Subject: [PATCH v2] nitro_enclaves: Set Bus Master for the NE PCI device

Enable Bus Master for the NE PCI device, according to the PCI spec
for submitting memory or I/O requests:

 Master Enable – Controls the ability of a PCI Express
  Endpoint to issue Memory and I/O Read/Write Requests, and
  the ability of a Root or Switch Port to forward Memory and
  I/O Read/Write Requests in the Upstream direction

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Andra Paraschiv <andraprs@...zon.com>
Cc: Alexandru Vasile <lexnv@...zon.com>
Cc: Alexandru Ciobotaru <alcioa@...zon.com>
Signed-off-by: Longpeng(Mike) <longpeng2@...wei.com>
---
Changes since v1:
  - update the commit message. [Andra]
---
 drivers/virt/nitro_enclaves/ne_pci_dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virt/nitro_enclaves/ne_pci_dev.c b/drivers/virt/nitro_enclaves/ne_pci_dev.c
index b9c1de4..143207e 100644
--- a/drivers/virt/nitro_enclaves/ne_pci_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_pci_dev.c
@@ -480,6 +480,8 @@ static int ne_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto free_ne_pci_dev;
 	}
 
+	pci_set_master(pdev);
+
 	rc = pci_request_regions_exclusive(pdev, "nitro_enclaves");
 	if (rc < 0) {
 		dev_err(&pdev->dev, "Error in pci request regions [rc=%d]\n", rc);
-- 
1.8.3.1