linux-kernel - [PATCH v1 4/7] fpga: dfl: fix VF creation when ports have no local BAR space

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Message-Id: <20220214112619.219761-5-tianfei.zhang@intel.com>
Date:   Mon, 14 Feb 2022 06:26:16 -0500
From:   Tianfei zhang <tianfei.zhang@...el.com>
To:     hao.wu@...el.com, trix@...hat.com, mdf@...nel.org,
        yilun.xu@...el.com, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     corbet@....net, Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Tianfei Zhang <tianfei.zhang@...el.com>
Subject: [PATCH v1 4/7] fpga: dfl: fix VF creation when ports have no local BAR space

From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>

When a port is not connected to the same PCIe endpoint as
the FME, the port does not need to be released before being
virtualized.  Fix VF creation code to handle this new use
case.

Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Tianfei Zhang <tianfei.zhang@...el.com>
---
 drivers/fpga/dfl.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 26f8cf890700..cfc539a656f0 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -1705,15 +1705,22 @@ EXPORT_SYMBOL_GPL(dfl_fpga_cdev_config_ports_pf);
 int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vfs)
 {
 	struct dfl_feature_platform_data *pdata;
-	int ret = 0;
+	int ret = 0, port_count = 0;
 
 	mutex_lock(&cdev->lock);
+
+	list_for_each_entry(pdata, &cdev->port_dev_list, node) {
+		if (pdata->dev)
+			continue;
+		port_count++;
+	}
+
 	/*
 	 * can't turn multiple ports into 1 VF device, only 1 port for 1 VF
 	 * device, so if released port number doesn't match VF device number,
 	 * then reject the request with -EINVAL error code.
 	 */
-	if (cdev->released_port_num != num_vfs) {
+	if (port_count && cdev->released_port_num != num_vfs) {
 		ret = -EINVAL;
 		goto done;
 	}
-- 
2.17.1